| /* Target-struct-independent code to start (run) and stop an inferior process. |
| Copyright 1986-1989, 1991-1999 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| |
| #include "defs.h" |
| #include "gdb_string.h" |
| #include <ctype.h> |
| #include "symtab.h" |
| #include "frame.h" |
| #include "inferior.h" |
| #include "breakpoint.h" |
| #include "wait.h" |
| #include "gdbcore.h" |
| #include "gdbcmd.h" |
| #include "target.h" |
| #include "gdbthread.h" |
| #include "annotate.h" |
| #include "symfile.h" /* for overlay functions */ |
| #include "top.h" |
| |
| #include <signal.h> |
| |
| /* Prototypes for local functions */ |
| |
| static void signals_info PARAMS ((char *, int)); |
| |
| static void handle_command PARAMS ((char *, int)); |
| |
| static void sig_print_info PARAMS ((enum target_signal)); |
| |
| static void sig_print_header PARAMS ((void)); |
| |
| static void resume_cleanups PARAMS ((int)); |
| |
| static int hook_stop_stub PARAMS ((PTR)); |
| |
| static void delete_breakpoint_current_contents PARAMS ((PTR)); |
| |
| static void set_follow_fork_mode_command PARAMS ((char *arg, int from_tty, struct cmd_list_element *c)); |
| |
| int inferior_ignoring_startup_exec_events = 0; |
| int inferior_ignoring_leading_exec_events = 0; |
| |
| /* wait_for_inferior and normal_stop use this to notify the user |
| when the inferior stopped in a different thread than it had been |
| running in. */ |
| static int switched_from_inferior_pid; |
| |
| /* This will be true for configurations that may actually report an |
| inferior pid different from the original. At present this is only |
| true for HP-UX native. */ |
| |
| #ifndef MAY_SWITCH_FROM_INFERIOR_PID |
| #define MAY_SWITCH_FROM_INFERIOR_PID (0) |
| #endif |
| |
| static int may_switch_from_inferior_pid = MAY_SWITCH_FROM_INFERIOR_PID; |
| |
| /* This is true for configurations that may follow through execl() and |
| similar functions. At present this is only true for HP-UX native. */ |
| |
| #ifndef MAY_FOLLOW_EXEC |
| #define MAY_FOLLOW_EXEC (0) |
| #endif |
| |
| static int may_follow_exec = MAY_FOLLOW_EXEC; |
| |
| /* resume and wait_for_inferior use this to ensure that when |
| stepping over a hit breakpoint in a threaded application |
| only the thread that hit the breakpoint is stepped and the |
| other threads don't continue. This prevents having another |
| thread run past the breakpoint while it is temporarily |
| removed. |
| |
| This is not thread-specific, so it isn't saved as part of |
| the infrun state. |
| |
| Versions of gdb which don't use the "step == this thread steps |
| and others continue" model but instead use the "step == this |
| thread steps and others wait" shouldn't do this. */ |
| static int thread_step_needed = 0; |
| |
| /* This is true if thread_step_needed should actually be used. At |
| present this is only true for HP-UX native. */ |
| |
| #ifndef USE_THREAD_STEP_NEEDED |
| #define USE_THREAD_STEP_NEEDED (0) |
| #endif |
| |
| static int use_thread_step_needed = USE_THREAD_STEP_NEEDED; |
| |
| static void follow_inferior_fork PARAMS ((int parent_pid, |
| int child_pid, |
| int has_forked, |
| int has_vforked)); |
| |
| static void follow_fork PARAMS ((int parent_pid, int child_pid)); |
| |
| static void follow_vfork PARAMS ((int parent_pid, int child_pid)); |
| |
| static void set_schedlock_func PARAMS ((char *args, int from_tty, |
| struct cmd_list_element *c)); |
| |
| static int is_internal_shlib_eventpoint PARAMS ((struct breakpoint *ep)); |
| |
| static int stopped_for_internal_shlib_event PARAMS ((bpstat bs)); |
| |
| static int stopped_for_shlib_catchpoint PARAMS ((bpstat bs, |
| struct breakpoint **cp_p)); |
| |
| #if __STDC__ |
| struct execution_control_state; |
| #endif |
| static int currently_stepping PARAMS ((struct execution_control_state *ecs)); |
| |
| static void xdb_handle_command PARAMS ((char *args, int from_tty)); |
| |
| void _initialize_infrun PARAMS ((void)); |
| |
| /* GET_LONGJMP_TARGET returns the PC at which longjmp() will resume the |
| program. It needs to examine the jmp_buf argument and extract the PC |
| from it. The return value is non-zero on success, zero otherwise. */ |
| |
| #ifndef GET_LONGJMP_TARGET |
| #define GET_LONGJMP_TARGET(PC_ADDR) 0 |
| #endif |
| |
| |
| /* Some machines have trampoline code that sits between function callers |
| and the actual functions themselves. If this machine doesn't have |
| such things, disable their processing. */ |
| |
| #ifndef SKIP_TRAMPOLINE_CODE |
| #define SKIP_TRAMPOLINE_CODE(pc) 0 |
| #endif |
| |
| /* Dynamic function trampolines are similar to solib trampolines in that they |
| are between the caller and the callee. The difference is that when you |
| enter a dynamic trampoline, you can't determine the callee's address. Some |
| (usually complex) code needs to run in the dynamic trampoline to figure out |
| the callee's address. This macro is usually called twice. First, when we |
| enter the trampoline (looks like a normal function call at that point). It |
| should return the PC of a point within the trampoline where the callee's |
| address is known. Second, when we hit the breakpoint, this routine returns |
| the callee's address. At that point, things proceed as per a step resume |
| breakpoint. */ |
| |
| #ifndef DYNAMIC_TRAMPOLINE_NEXTPC |
| #define DYNAMIC_TRAMPOLINE_NEXTPC(pc) 0 |
| #endif |
| |
| /* On SVR4 based systems, determining the callee's address is exceedingly |
| difficult and depends on the implementation of the run time loader. |
| If we are stepping at the source level, we single step until we exit |
| the run time loader code and reach the callee's address. */ |
| |
| #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE |
| #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0 |
| #endif |
| |
| /* For SVR4 shared libraries, each call goes through a small piece of |
| trampoline code in the ".plt" section. IN_SOLIB_CALL_TRAMPOLINE evaluates |
| to nonzero if we are current stopped in one of these. */ |
| |
| #ifndef IN_SOLIB_CALL_TRAMPOLINE |
| #define IN_SOLIB_CALL_TRAMPOLINE(pc,name) 0 |
| #endif |
| |
| /* In some shared library schemes, the return path from a shared library |
| call may need to go through a trampoline too. */ |
| |
| #ifndef IN_SOLIB_RETURN_TRAMPOLINE |
| #define IN_SOLIB_RETURN_TRAMPOLINE(pc,name) 0 |
| #endif |
| |
| /* This function returns TRUE if pc is the address of an instruction |
| that lies within the dynamic linker (such as the event hook, or the |
| dld itself). |
| |
| This function must be used only when a dynamic linker event has |
| been caught, and the inferior is being stepped out of the hook, or |
| undefined results are guaranteed. */ |
| |
| #ifndef SOLIB_IN_DYNAMIC_LINKER |
| #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 |
| #endif |
| |
| /* On MIPS16, a function that returns a floating point value may call |
| a library helper function to copy the return value to a floating point |
| register. The IGNORE_HELPER_CALL macro returns non-zero if we |
| should ignore (i.e. step over) this function call. */ |
| #ifndef IGNORE_HELPER_CALL |
| #define IGNORE_HELPER_CALL(pc) 0 |
| #endif |
| |
| /* On some systems, the PC may be left pointing at an instruction that won't |
| actually be executed. This is usually indicated by a bit in the PSW. If |
| we find ourselves in such a state, then we step the target beyond the |
| nullified instruction before returning control to the user so as to avoid |
| confusion. */ |
| |
| #ifndef INSTRUCTION_NULLIFIED |
| #define INSTRUCTION_NULLIFIED 0 |
| #endif |
| |
| /* Convert the #defines into values. This is temporary until wfi control |
| flow is completely sorted out. */ |
| |
| #ifndef HAVE_STEPPABLE_WATCHPOINT |
| #define HAVE_STEPPABLE_WATCHPOINT 0 |
| #else |
| #undef HAVE_STEPPABLE_WATCHPOINT |
| #define HAVE_STEPPABLE_WATCHPOINT 1 |
| #endif |
| |
| #ifndef HAVE_NONSTEPPABLE_WATCHPOINT |
| #define HAVE_NONSTEPPABLE_WATCHPOINT 0 |
| #else |
| #undef HAVE_NONSTEPPABLE_WATCHPOINT |
| #define HAVE_NONSTEPPABLE_WATCHPOINT 1 |
| #endif |
| |
| #ifndef HAVE_CONTINUABLE_WATCHPOINT |
| #define HAVE_CONTINUABLE_WATCHPOINT 0 |
| #else |
| #undef HAVE_CONTINUABLE_WATCHPOINT |
| #define HAVE_CONTINUABLE_WATCHPOINT 1 |
| #endif |
| |
| /* Tables of how to react to signals; the user sets them. */ |
| |
| static unsigned char *signal_stop; |
| static unsigned char *signal_print; |
| static unsigned char *signal_program; |
| |
| #define SET_SIGS(nsigs,sigs,flags) \ |
| do { \ |
| int signum = (nsigs); \ |
| while (signum-- > 0) \ |
| if ((sigs)[signum]) \ |
| (flags)[signum] = 1; \ |
| } while (0) |
| |
| #define UNSET_SIGS(nsigs,sigs,flags) \ |
| do { \ |
| int signum = (nsigs); \ |
| while (signum-- > 0) \ |
| if ((sigs)[signum]) \ |
| (flags)[signum] = 0; \ |
| } while (0) |
| |
| |
| /* Command list pointer for the "stop" placeholder. */ |
| |
| static struct cmd_list_element *stop_command; |
| |
| /* Nonzero if breakpoints are now inserted in the inferior. */ |
| |
| static int breakpoints_inserted; |
| |
| /* Function inferior was in as of last step command. */ |
| |
| static struct symbol *step_start_function; |
| |
| /* Nonzero if we are expecting a trace trap and should proceed from it. */ |
| |
| static int trap_expected; |
| |
| #ifdef SOLIB_ADD |
| /* Nonzero if we want to give control to the user when we're notified |
| of shared library events by the dynamic linker. */ |
| static int stop_on_solib_events; |
| #endif |
| |
| #ifdef HP_OS_BUG |
| /* Nonzero if the next time we try to continue the inferior, it will |
| step one instruction and generate a spurious trace trap. |
| This is used to compensate for a bug in HP-UX. */ |
| |
| static int trap_expected_after_continue; |
| #endif |
| |
| /* Nonzero means expecting a trace trap |
| and should stop the inferior and return silently when it happens. */ |
| |
| int stop_after_trap; |
| |
| /* Nonzero means expecting a trap and caller will handle it themselves. |
| It is used after attach, due to attaching to a process; |
| when running in the shell before the child program has been exec'd; |
| and when running some kinds of remote stuff (FIXME?). */ |
| |
| int stop_soon_quietly; |
| |
| /* Nonzero if proceed is being used for a "finish" command or a similar |
| situation when stop_registers should be saved. */ |
| |
| int proceed_to_finish; |
| |
| /* Save register contents here when about to pop a stack dummy frame, |
| if-and-only-if proceed_to_finish is set. |
| Thus this contains the return value from the called function (assuming |
| values are returned in a register). */ |
| |
| char *stop_registers; |
| |
| /* Nonzero if program stopped due to error trying to insert breakpoints. */ |
| |
| static int breakpoints_failed; |
| |
| /* Nonzero after stop if current stack frame should be printed. */ |
| |
| static int stop_print_frame; |
| |
| static struct breakpoint *step_resume_breakpoint = NULL; |
| static struct breakpoint *through_sigtramp_breakpoint = NULL; |
| |
| /* On some platforms (e.g., HP-UX), hardware watchpoints have bad |
| interactions with an inferior that is running a kernel function |
| (aka, a system call or "syscall"). wait_for_inferior therefore |
| may have a need to know when the inferior is in a syscall. This |
| is a count of the number of inferior threads which are known to |
| currently be running in a syscall. */ |
| static int number_of_threads_in_syscalls; |
| |
| /* This is used to remember when a fork, vfork or exec event |
| was caught by a catchpoint, and thus the event is to be |
| followed at the next resume of the inferior, and not |
| immediately. */ |
| static struct |
| { |
| enum target_waitkind kind; |
| struct |
| { |
| int parent_pid; |
| int saw_parent_fork; |
| int child_pid; |
| int saw_child_fork; |
| int saw_child_exec; |
| } |
| fork_event; |
| char *execd_pathname; |
| } |
| pending_follow; |
| |
| /* Some platforms don't allow us to do anything meaningful with a |
| vforked child until it has exec'd. Vforked processes on such |
| platforms can only be followed after they've exec'd. |
| |
| When this is set to 0, a vfork can be immediately followed, |
| and an exec can be followed merely as an exec. When this is |
| set to 1, a vfork event has been seen, but cannot be followed |
| until the exec is seen. |
| |
| (In the latter case, inferior_pid is still the parent of the |
| vfork, and pending_follow.fork_event.child_pid is the child. The |
| appropriate process is followed, according to the setting of |
| follow-fork-mode.) */ |
| static int follow_vfork_when_exec; |
| |
| static char *follow_fork_mode_kind_names[] = |
| { |
| /* ??rehrauer: The "both" option is broken, by what may be a 10.20 |
| kernel problem. It's also not terribly useful without a GUI to |
| help the user drive two debuggers. So for now, I'm disabling |
| the "both" option. |
| "parent", "child", "both", "ask" }; |
| */ |
| "parent", "child", "ask"}; |
| |
| static char *follow_fork_mode_string = NULL; |
| |
| |
| static void |
| follow_inferior_fork (parent_pid, child_pid, has_forked, has_vforked) |
| int parent_pid; |
| int child_pid; |
| int has_forked; |
| int has_vforked; |
| { |
| int followed_parent = 0; |
| int followed_child = 0; |
| int ima_clone = 0; |
| |
| /* Which process did the user want us to follow? */ |
| char *follow_mode = |
| savestring (follow_fork_mode_string, strlen (follow_fork_mode_string)); |
| |
| /* Or, did the user not know, and want us to ask? */ |
| if (STREQ (follow_fork_mode_string, "ask")) |
| { |
| char requested_mode[100]; |
| |
| free (follow_mode); |
| error ("\"ask\" mode NYI"); |
| follow_mode = savestring (requested_mode, strlen (requested_mode)); |
| } |
| |
| /* If we're to be following the parent, then detach from child_pid. |
| We're already following the parent, so need do nothing explicit |
| for it. */ |
| if (STREQ (follow_mode, "parent")) |
| { |
| followed_parent = 1; |
| |
| /* We're already attached to the parent, by default. */ |
| |
| /* Before detaching from the child, remove all breakpoints from |
| it. (This won't actually modify the breakpoint list, but will |
| physically remove the breakpoints from the child.) */ |
| if (!has_vforked || !follow_vfork_when_exec) |
| { |
| detach_breakpoints (child_pid); |
| #ifdef SOLIB_REMOVE_INFERIOR_HOOK |
| SOLIB_REMOVE_INFERIOR_HOOK (child_pid); |
| #endif |
| } |
| |
| /* Detach from the child. */ |
| dont_repeat (); |
| |
| target_require_detach (child_pid, "", 1); |
| } |
| |
| /* If we're to be following the child, then attach to it, detach |
| from inferior_pid, and set inferior_pid to child_pid. */ |
| else if (STREQ (follow_mode, "child")) |
| { |
| char child_pid_spelling[100]; /* Arbitrary length. */ |
| |
| followed_child = 1; |
| |
| /* Before detaching from the parent, detach all breakpoints from |
| the child. But only if we're forking, or if we follow vforks |
| as soon as they happen. (If we're following vforks only when |
| the child has exec'd, then it's very wrong to try to write |
| back the "shadow contents" of inserted breakpoints now -- they |
| belong to the child's pre-exec'd a.out.) */ |
| if (!has_vforked || !follow_vfork_when_exec) |
| { |
| detach_breakpoints (child_pid); |
| } |
| |
| /* Before detaching from the parent, remove all breakpoints from it. */ |
| remove_breakpoints (); |
| |
| /* Also reset the solib inferior hook from the parent. */ |
| #ifdef SOLIB_REMOVE_INFERIOR_HOOK |
| SOLIB_REMOVE_INFERIOR_HOOK (inferior_pid); |
| #endif |
| |
| /* Detach from the parent. */ |
| dont_repeat (); |
| target_detach (NULL, 1); |
| |
| /* Attach to the child. */ |
| inferior_pid = child_pid; |
| sprintf (child_pid_spelling, "%d", child_pid); |
| dont_repeat (); |
| |
| target_require_attach (child_pid_spelling, 1); |
| |
| /* Was there a step_resume breakpoint? (There was if the user |
| did a "next" at the fork() call.) If so, explicitly reset its |
| thread number. |
| |
| step_resumes are a form of bp that are made to be per-thread. |
| Since we created the step_resume bp when the parent process |
| was being debugged, and now are switching to the child process, |
| from the breakpoint package's viewpoint, that's a switch of |
| "threads". We must update the bp's notion of which thread |
| it is for, or it'll be ignored when it triggers... */ |
| if (step_resume_breakpoint && |
| (!has_vforked || !follow_vfork_when_exec)) |
| breakpoint_re_set_thread (step_resume_breakpoint); |
| |
| /* Reinsert all breakpoints in the child. (The user may've set |
| breakpoints after catching the fork, in which case those |
| actually didn't get set in the child, but only in the parent.) */ |
| if (!has_vforked || !follow_vfork_when_exec) |
| { |
| breakpoint_re_set (); |
| insert_breakpoints (); |
| } |
| } |
| |
| /* If we're to be following both parent and child, then fork ourselves, |
| and attach the debugger clone to the child. */ |
| else if (STREQ (follow_mode, "both")) |
| { |
| char pid_suffix[100]; /* Arbitrary length. */ |
| |
| /* Clone ourselves to follow the child. This is the end of our |
| involvement with child_pid; our clone will take it from here... */ |
| dont_repeat (); |
| target_clone_and_follow_inferior (child_pid, &followed_child); |
| followed_parent = !followed_child; |
| |
| /* We continue to follow the parent. To help distinguish the two |
| debuggers, though, both we and our clone will reset our prompts. */ |
| sprintf (pid_suffix, "[%d] ", inferior_pid); |
| set_prompt (strcat (get_prompt (), pid_suffix)); |
| } |
| |
| /* The parent and child of a vfork share the same address space. |
| Also, on some targets the order in which vfork and exec events |
| are received for parent in child requires some delicate handling |
| of the events. |
| |
| For instance, on ptrace-based HPUX we receive the child's vfork |
| event first, at which time the parent has been suspended by the |
| OS and is essentially untouchable until the child's exit or second |
| exec event arrives. At that time, the parent's vfork event is |
| delivered to us, and that's when we see and decide how to follow |
| the vfork. But to get to that point, we must continue the child |
| until it execs or exits. To do that smoothly, all breakpoints |
| must be removed from the child, in case there are any set between |
| the vfork() and exec() calls. But removing them from the child |
| also removes them from the parent, due to the shared-address-space |
| nature of a vfork'd parent and child. On HPUX, therefore, we must |
| take care to restore the bp's to the parent before we continue it. |
| Else, it's likely that we may not stop in the expected place. (The |
| worst scenario is when the user tries to step over a vfork() call; |
| the step-resume bp must be restored for the step to properly stop |
| in the parent after the call completes!) |
| |
| Sequence of events, as reported to gdb from HPUX: |
| |
| Parent Child Action for gdb to take |
| ------------------------------------------------------- |
| 1 VFORK Continue child |
| 2 EXEC |
| 3 EXEC or EXIT |
| 4 VFORK */ |
| if (has_vforked) |
| { |
| target_post_follow_vfork (parent_pid, |
| followed_parent, |
| child_pid, |
| followed_child); |
| } |
| |
| pending_follow.fork_event.saw_parent_fork = 0; |
| pending_follow.fork_event.saw_child_fork = 0; |
| |
| free (follow_mode); |
| } |
| |
| static void |
| follow_fork (parent_pid, child_pid) |
| int parent_pid; |
| int child_pid; |
| { |
| follow_inferior_fork (parent_pid, child_pid, 1, 0); |
| } |
| |
| |
| /* Forward declaration. */ |
| static void follow_exec PARAMS ((int, char *)); |
| |
| static void |
| follow_vfork (parent_pid, child_pid) |
| int parent_pid; |
| int child_pid; |
| { |
| follow_inferior_fork (parent_pid, child_pid, 0, 1); |
| |
| /* Did we follow the child? Had it exec'd before we saw the parent vfork? */ |
| if (pending_follow.fork_event.saw_child_exec && (inferior_pid == child_pid)) |
| { |
| pending_follow.fork_event.saw_child_exec = 0; |
| pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
| follow_exec (inferior_pid, pending_follow.execd_pathname); |
| free (pending_follow.execd_pathname); |
| } |
| } |
| |
| static void |
| follow_exec (pid, execd_pathname) |
| int pid; |
| char *execd_pathname; |
| { |
| int saved_pid = pid; |
| struct target_ops *tgt; |
| |
| if (!may_follow_exec) |
| return; |
| |
| /* Did this exec() follow a vfork()? If so, we must follow the |
| vfork now too. Do it before following the exec. */ |
| if (follow_vfork_when_exec && |
| (pending_follow.kind == TARGET_WAITKIND_VFORKED)) |
| { |
| pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
| follow_vfork (inferior_pid, pending_follow.fork_event.child_pid); |
| follow_vfork_when_exec = 0; |
| saved_pid = inferior_pid; |
| |
| /* Did we follow the parent? If so, we're done. If we followed |
| the child then we must also follow its exec(). */ |
| if (inferior_pid == pending_follow.fork_event.parent_pid) |
| return; |
| } |
| |
| /* This is an exec event that we actually wish to pay attention to. |
| Refresh our symbol table to the newly exec'd program, remove any |
| momentary bp's, etc. |
| |
| If there are breakpoints, they aren't really inserted now, |
| since the exec() transformed our inferior into a fresh set |
| of instructions. |
| |
| We want to preserve symbolic breakpoints on the list, since |
| we have hopes that they can be reset after the new a.out's |
| symbol table is read. |
| |
| However, any "raw" breakpoints must be removed from the list |
| (e.g., the solib bp's), since their address is probably invalid |
| now. |
| |
| And, we DON'T want to call delete_breakpoints() here, since |
| that may write the bp's "shadow contents" (the instruction |
| value that was overwritten witha TRAP instruction). Since |
| we now have a new a.out, those shadow contents aren't valid. */ |
| update_breakpoints_after_exec (); |
| |
| /* If there was one, it's gone now. We cannot truly step-to-next |
| statement through an exec(). */ |
| step_resume_breakpoint = NULL; |
| step_range_start = 0; |
| step_range_end = 0; |
| |
| /* If there was one, it's gone now. */ |
| through_sigtramp_breakpoint = NULL; |
| |
| /* What is this a.out's name? */ |
| printf_unfiltered ("Executing new program: %s\n", execd_pathname); |
| |
| /* We've followed the inferior through an exec. Therefore, the |
| inferior has essentially been killed & reborn. */ |
| |
| /* First collect the run target in effect. */ |
| tgt = find_run_target (); |
| /* If we can't find one, things are in a very strange state... */ |
| if (tgt == NULL) |
| error ("Could find run target to save before following exec"); |
| |
| gdb_flush (gdb_stdout); |
| target_mourn_inferior (); |
| inferior_pid = saved_pid; /* Because mourn_inferior resets inferior_pid. */ |
| push_target (tgt); |
| |
| /* That a.out is now the one to use. */ |
| exec_file_attach (execd_pathname, 0); |
| |
| /* And also is where symbols can be found. */ |
| symbol_file_command (execd_pathname, 0); |
| |
| /* Reset the shared library package. This ensures that we get |
| a shlib event when the child reaches "_start", at which point |
| the dld will have had a chance to initialize the child. */ |
| #if defined(SOLIB_RESTART) |
| SOLIB_RESTART (); |
| #endif |
| #ifdef SOLIB_CREATE_INFERIOR_HOOK |
| SOLIB_CREATE_INFERIOR_HOOK (inferior_pid); |
| #endif |
| |
| /* Reinsert all breakpoints. (Those which were symbolic have |
| been reset to the proper address in the new a.out, thanks |
| to symbol_file_command...) */ |
| insert_breakpoints (); |
| |
| /* The next resume of this inferior should bring it to the shlib |
| startup breakpoints. (If the user had also set bp's on |
| "main" from the old (parent) process, then they'll auto- |
| matically get reset there in the new process.) */ |
| } |
| |
| /* Non-zero if we just simulating a single-step. This is needed |
| because we cannot remove the breakpoints in the inferior process |
| until after the `wait' in `wait_for_inferior'. */ |
| static int singlestep_breakpoints_inserted_p = 0; |
| |
| |
| /* Things to clean up if we QUIT out of resume (). */ |
| /* ARGSUSED */ |
| static void |
| resume_cleanups (arg) |
| int arg; |
| { |
| normal_stop (); |
| } |
| |
| static char schedlock_off[] = "off"; |
| static char schedlock_on[] = "on"; |
| static char schedlock_step[] = "step"; |
| static char *scheduler_mode = schedlock_off; |
| static char *scheduler_enums[] = |
| {schedlock_off, schedlock_on, schedlock_step}; |
| |
| static void |
| set_schedlock_func (args, from_tty, c) |
| char *args; |
| int from_tty; |
| struct cmd_list_element *c; |
| { |
| if (c->type == set_cmd) |
| if (!target_can_lock_scheduler) |
| { |
| scheduler_mode = schedlock_off; |
| error ("Target '%s' cannot support this command.", |
| target_shortname); |
| } |
| } |
| |
| |
| /* Resume the inferior, but allow a QUIT. This is useful if the user |
| wants to interrupt some lengthy single-stepping operation |
| (for child processes, the SIGINT goes to the inferior, and so |
| we get a SIGINT random_signal, but for remote debugging and perhaps |
| other targets, that's not true). |
| |
| STEP nonzero if we should step (zero to continue instead). |
| SIG is the signal to give the inferior (zero for none). */ |
| void |
| resume (step, sig) |
| int step; |
| enum target_signal sig; |
| { |
| int should_resume = 1; |
| struct cleanup *old_cleanups = make_cleanup ((make_cleanup_func) |
| resume_cleanups, 0); |
| QUIT; |
| |
| #ifdef CANNOT_STEP_BREAKPOINT |
| /* Most targets can step a breakpoint instruction, thus executing it |
| normally. But if this one cannot, just continue and we will hit |
| it anyway. */ |
| if (step && breakpoints_inserted && breakpoint_here_p (read_pc ())) |
| step = 0; |
| #endif |
| |
| if (SOFTWARE_SINGLE_STEP_P && step) |
| { |
| /* Do it the hard way, w/temp breakpoints */ |
| SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints*/ ); |
| /* ...and don't ask hardware to do it. */ |
| step = 0; |
| /* and do not pull these breakpoints until after a `wait' in |
| `wait_for_inferior' */ |
| singlestep_breakpoints_inserted_p = 1; |
| } |
| |
| /* Handle any optimized stores to the inferior NOW... */ |
| #ifdef DO_DEFERRED_STORES |
| DO_DEFERRED_STORES; |
| #endif |
| |
| /* If there were any forks/vforks/execs that were caught and are |
| now to be followed, then do so. */ |
| switch (pending_follow.kind) |
| { |
| case (TARGET_WAITKIND_FORKED): |
| pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
| follow_fork (inferior_pid, pending_follow.fork_event.child_pid); |
| break; |
| |
| case (TARGET_WAITKIND_VFORKED): |
| { |
| int saw_child_exec = pending_follow.fork_event.saw_child_exec; |
| |
| pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
| follow_vfork (inferior_pid, pending_follow.fork_event.child_pid); |
| |
| /* Did we follow the child, but not yet see the child's exec event? |
| If so, then it actually ought to be waiting for us; we respond to |
| parent vfork events. We don't actually want to resume the child |
| in this situation; we want to just get its exec event. */ |
| if (!saw_child_exec && |
| (inferior_pid == pending_follow.fork_event.child_pid)) |
| should_resume = 0; |
| } |
| break; |
| |
| case (TARGET_WAITKIND_EXECD): |
| /* If we saw a vfork event but couldn't follow it until we saw |
| an exec, then now might be the time! */ |
| pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
| /* follow_exec is called as soon as the exec event is seen. */ |
| break; |
| |
| default: |
| break; |
| } |
| |
| /* Install inferior's terminal modes. */ |
| target_terminal_inferior (); |
| |
| if (should_resume) |
| { |
| if (use_thread_step_needed && thread_step_needed) |
| { |
| /* We stopped on a BPT instruction; |
| don't continue other threads and |
| just step this thread. */ |
| thread_step_needed = 0; |
| |
| if (!breakpoint_here_p (read_pc ())) |
| { |
| /* Breakpoint deleted: ok to do regular resume |
| where all the threads either step or continue. */ |
| target_resume (-1, step, sig); |
| } |
| else |
| { |
| if (!step) |
| { |
| warning ("Internal error, changing continue to step."); |
| remove_breakpoints (); |
| breakpoints_inserted = 0; |
| trap_expected = 1; |
| step = 1; |
| } |
| |
| target_resume (inferior_pid, step, sig); |
| } |
| } |
| else |
| { |
| /* Vanilla resume. */ |
| |
| if ((scheduler_mode == schedlock_on) || |
| (scheduler_mode == schedlock_step && step != 0)) |
| target_resume (inferior_pid, step, sig); |
| else |
| target_resume (-1, step, sig); |
| } |
| } |
| |
| discard_cleanups (old_cleanups); |
| } |
| |
| |
| /* Clear out all variables saying what to do when inferior is continued. |
| First do this, then set the ones you want, then call `proceed'. */ |
| |
| void |
| clear_proceed_status () |
| { |
| trap_expected = 0; |
| step_range_start = 0; |
| step_range_end = 0; |
| step_frame_address = 0; |
| step_over_calls = -1; |
| stop_after_trap = 0; |
| stop_soon_quietly = 0; |
| proceed_to_finish = 0; |
| breakpoint_proceeded = 1; /* We're about to proceed... */ |
| |
| /* Discard any remaining commands or status from previous stop. */ |
| bpstat_clear (&stop_bpstat); |
| } |
| |
| /* Basic routine for continuing the program in various fashions. |
| |
| ADDR is the address to resume at, or -1 for resume where stopped. |
| SIGGNAL is the signal to give it, or 0 for none, |
| or -1 for act according to how it stopped. |
| STEP is nonzero if should trap after one instruction. |
| -1 means return after that and print nothing. |
| You should probably set various step_... variables |
| before calling here, if you are stepping. |
| |
| You should call clear_proceed_status before calling proceed. */ |
| |
| void |
| proceed (addr, siggnal, step) |
| CORE_ADDR addr; |
| enum target_signal siggnal; |
| int step; |
| { |
| int oneproc = 0; |
| |
| if (step > 0) |
| step_start_function = find_pc_function (read_pc ()); |
| if (step < 0) |
| stop_after_trap = 1; |
| |
| if (addr == (CORE_ADDR) - 1) |
| { |
| /* If there is a breakpoint at the address we will resume at, |
| step one instruction before inserting breakpoints |
| so that we do not stop right away (and report a second |
| hit at this breakpoint). */ |
| |
| if (read_pc () == stop_pc && breakpoint_here_p (read_pc ())) |
| oneproc = 1; |
| |
| #ifndef STEP_SKIPS_DELAY |
| #define STEP_SKIPS_DELAY(pc) (0) |
| #define STEP_SKIPS_DELAY_P (0) |
| #endif |
| /* Check breakpoint_here_p first, because breakpoint_here_p is fast |
| (it just checks internal GDB data structures) and STEP_SKIPS_DELAY |
| is slow (it needs to read memory from the target). */ |
| if (STEP_SKIPS_DELAY_P |
| && breakpoint_here_p (read_pc () + 4) |
| && STEP_SKIPS_DELAY (read_pc ())) |
| oneproc = 1; |
| } |
| else |
| { |
| write_pc (addr); |
| |
| /* New address; we don't need to single-step a thread |
| over a breakpoint we just hit, 'cause we aren't |
| continuing from there. |
| |
| It's not worth worrying about the case where a user |
| asks for a "jump" at the current PC--if they get the |
| hiccup of re-hiting a hit breakpoint, what else do |
| they expect? */ |
| thread_step_needed = 0; |
| } |
| |
| #ifdef PREPARE_TO_PROCEED |
| /* In a multi-threaded task we may select another thread |
| and then continue or step. |
| |
| But if the old thread was stopped at a breakpoint, it |
| will immediately cause another breakpoint stop without |
| any execution (i.e. it will report a breakpoint hit |
| incorrectly). So we must step over it first. |
| |
| PREPARE_TO_PROCEED checks the current thread against the thread |
| that reported the most recent event. If a step-over is required |
| it returns TRUE and sets the current thread to the old thread. */ |
| if (PREPARE_TO_PROCEED (1) && breakpoint_here_p (read_pc ())) |
| { |
| oneproc = 1; |
| thread_step_needed = 1; |
| } |
| |
| #endif /* PREPARE_TO_PROCEED */ |
| |
| #ifdef HP_OS_BUG |
| if (trap_expected_after_continue) |
| { |
| /* If (step == 0), a trap will be automatically generated after |
| the first instruction is executed. Force step one |
| instruction to clear this condition. This should not occur |
| if step is nonzero, but it is harmless in that case. */ |
| oneproc = 1; |
| trap_expected_after_continue = 0; |
| } |
| #endif /* HP_OS_BUG */ |
| |
| if (oneproc) |
| /* We will get a trace trap after one instruction. |
| Continue it automatically and insert breakpoints then. */ |
| trap_expected = 1; |
| else |
| { |
| int temp = insert_breakpoints (); |
| if (temp) |
| { |
| print_sys_errmsg ("ptrace", temp); |
| error ("Cannot insert breakpoints.\n\ |
| The same program may be running in another process."); |
| } |
| |
| breakpoints_inserted = 1; |
| } |
| |
| if (siggnal != TARGET_SIGNAL_DEFAULT) |
| stop_signal = siggnal; |
| /* If this signal should not be seen by program, |
| give it zero. Used for debugging signals. */ |
| else if (!signal_program[stop_signal]) |
| stop_signal = TARGET_SIGNAL_0; |
| |
| annotate_starting (); |
| |
| /* Make sure that output from GDB appears before output from the |
| inferior. */ |
| gdb_flush (gdb_stdout); |
| |
| /* Resume inferior. */ |
| resume (oneproc || step || bpstat_should_step (), stop_signal); |
| |
| /* Wait for it to stop (if not standalone) |
| and in any case decode why it stopped, and act accordingly. */ |
| |
| wait_for_inferior (); |
| normal_stop (); |
| } |
| |
| /* Record the pc and sp of the program the last time it stopped. |
| These are just used internally by wait_for_inferior, but need |
| to be preserved over calls to it and cleared when the inferior |
| is started. */ |
| static CORE_ADDR prev_pc; |
| static CORE_ADDR prev_func_start; |
| static char *prev_func_name; |
| |
| |
| /* Start remote-debugging of a machine over a serial link. */ |
| |
| void |
| start_remote () |
| { |
| init_thread_list (); |
| init_wait_for_inferior (); |
| stop_soon_quietly = 1; |
| trap_expected = 0; |
| wait_for_inferior (); |
| normal_stop (); |
| } |
| |
| /* Initialize static vars when a new inferior begins. */ |
| |
| void |
| init_wait_for_inferior () |
| { |
| /* These are meaningless until the first time through wait_for_inferior. */ |
| prev_pc = 0; |
| prev_func_start = 0; |
| prev_func_name = NULL; |
| |
| #ifdef HP_OS_BUG |
| trap_expected_after_continue = 0; |
| #endif |
| breakpoints_inserted = 0; |
| breakpoint_init_inferior (inf_starting); |
| |
| /* Don't confuse first call to proceed(). */ |
| stop_signal = TARGET_SIGNAL_0; |
| |
| /* The first resume is not following a fork/vfork/exec. */ |
| pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */ |
| pending_follow.fork_event.saw_parent_fork = 0; |
| pending_follow.fork_event.saw_child_fork = 0; |
| pending_follow.fork_event.saw_child_exec = 0; |
| |
| /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */ |
| number_of_threads_in_syscalls = 0; |
| |
| clear_proceed_status (); |
| } |
| |
| static void |
| delete_breakpoint_current_contents (arg) |
| PTR arg; |
| { |
| struct breakpoint **breakpointp = (struct breakpoint **) arg; |
| if (*breakpointp != NULL) |
| { |
| delete_breakpoint (*breakpointp); |
| *breakpointp = NULL; |
| } |
| } |
| |
| /* This enum encodes possible reasons for doing a target_wait, so that |
| wfi can call target_wait in one place. (Ultimately the call will be |
| moved out of the infinite loop entirely.) */ |
| |
| enum infwait_states { |
| infwait_normal_state, |
| infwait_thread_hop_state, |
| infwait_nullified_state, |
| infwait_nonstep_watch_state |
| }; |
| |
| /* This structure contains what used to be local variables in |
| wait_for_inferior. Probably many of them can return to being |
| locals in handle_inferior_event. */ |
| |
| struct execution_control_state { |
| struct target_waitstatus ws; |
| struct target_waitstatus *wp; |
| int another_trap; |
| int random_signal; |
| CORE_ADDR stop_func_start; |
| CORE_ADDR stop_func_end; |
| char *stop_func_name; |
| struct symtab_and_line sal; |
| int remove_breakpoints_on_following_step; |
| int current_line; |
| struct symtab *current_symtab; |
| int handling_longjmp; /* FIXME */ |
| int pid; |
| int saved_inferior_pid; |
| int update_step_sp; |
| int stepping_through_solib_after_catch; |
| bpstat stepping_through_solib_catchpoints; |
| int enable_hw_watchpoints_after_wait; |
| int stepping_through_sigtramp; |
| int new_thread_event; |
| struct target_waitstatus tmpstatus; |
| enum infwait_states infwait_state; |
| int waiton_pid; |
| int wait_some_more; |
| }; |
| |
| void init_execution_control_state PARAMS ((struct execution_control_state *ecs)); |
| |
| void handle_inferior_event PARAMS ((struct execution_control_state *ecs)); |
| |
| /* Wait for control to return from inferior to debugger. |
| If inferior gets a signal, we may decide to start it up again |
| instead of returning. That is why there is a loop in this function. |
| When this function actually returns it means the inferior |
| should be left stopped and GDB should read more commands. */ |
| |
| void |
| wait_for_inferior () |
| { |
| struct cleanup *old_cleanups; |
| struct execution_control_state ecss; |
| struct execution_control_state *ecs; |
| |
| old_cleanups = make_cleanup (delete_breakpoint_current_contents, |
| &step_resume_breakpoint); |
| make_cleanup (delete_breakpoint_current_contents, |
| &through_sigtramp_breakpoint); |
| |
| /* wfi still stays in a loop, so it's OK just to take the address of |
| a local to get the ecs pointer. */ |
| ecs = &ecss; |
| |
| /* Fill in with reasonable starting values. */ |
| init_execution_control_state (ecs); |
| |
| thread_step_needed = 0; |
| |
| /* We'll update this if & when we switch to a new thread. */ |
| if (may_switch_from_inferior_pid) |
| switched_from_inferior_pid = inferior_pid; |
| |
| overlay_cache_invalid = 1; |
| |
| /* We have to invalidate the registers BEFORE calling target_wait |
| because they can be loaded from the target while in target_wait. |
| This makes remote debugging a bit more efficient for those |
| targets that provide critical registers as part of their normal |
| status mechanism. */ |
| |
| registers_changed (); |
| |
| while (1) |
| { |
| if (target_wait_hook) |
| ecs->pid = target_wait_hook (ecs->waiton_pid, ecs->wp); |
| else |
| ecs->pid = target_wait (ecs->waiton_pid, ecs->wp); |
| |
| /* Now figure out what to do with the result of the result. */ |
| handle_inferior_event (ecs); |
| |
| if (!ecs->wait_some_more) |
| break; |
| } |
| do_cleanups (old_cleanups); |
| } |
| |
| /* Prepare an execution control state for looping through a |
| wait_for_inferior-type loop. */ |
| |
| void |
| init_execution_control_state (ecs) |
| struct execution_control_state *ecs; |
| { |
| ecs->random_signal = 0; |
| ecs->remove_breakpoints_on_following_step = 0; |
| ecs->handling_longjmp = 0; /* FIXME */ |
| ecs->update_step_sp = 0; |
| ecs->stepping_through_solib_after_catch = 0; |
| ecs->stepping_through_solib_catchpoints = NULL; |
| ecs->enable_hw_watchpoints_after_wait = 0; |
| ecs->stepping_through_sigtramp = 0; |
| ecs->sal = find_pc_line (prev_pc, 0); |
| ecs->current_line = ecs->sal.line; |
| ecs->current_symtab = ecs->sal.symtab; |
| ecs->infwait_state = infwait_normal_state; |
| ecs->waiton_pid = -1; |
| ecs->wp = &(ecs->ws); |
| } |
| |
| /* Given an execution control state that has been freshly filled in |
| by an event from the inferior, figure out what it means and take |
| appropriate action. */ |
| |
| void |
| handle_inferior_event (ecs) |
| struct execution_control_state *ecs; |
| { |
| CORE_ADDR tmp; |
| int stepped_after_stopped_by_watchpoint; |
| |
| /* Keep this extra brace for now, minimizes diffs. */ |
| { |
| switch (ecs->infwait_state) |
| { |
| case infwait_normal_state: |
| /* Since we've done a wait, we have a new event. Don't |
| carry over any expectations about needing to step over a |
| breakpoint. */ |
| thread_step_needed = 0; |
| |
| /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event |
| is serviced in this loop, below. */ |
| if (ecs->enable_hw_watchpoints_after_wait) |
| { |
| TARGET_ENABLE_HW_WATCHPOINTS (inferior_pid); |
| ecs->enable_hw_watchpoints_after_wait = 0; |
| } |
| stepped_after_stopped_by_watchpoint = 0; |
| break; |
| |
| case infwait_thread_hop_state: |
| insert_breakpoints (); |
| |
| /* We need to restart all the threads now, |
| * unles we're running in scheduler-locked mode. |
| * FIXME: shouldn't we look at currently_stepping ()? |
| */ |
| if (scheduler_mode == schedlock_on) |
| target_resume (ecs->pid, 0, TARGET_SIGNAL_0); |
| else |
| target_resume (-1, 0, TARGET_SIGNAL_0); |
| ecs->infwait_state = infwait_normal_state; |
| goto wfi_continue; |
| |
| case infwait_nullified_state: |
| break; |
| |
| case infwait_nonstep_watch_state: |
| insert_breakpoints (); |
| |
| /* FIXME-maybe: is this cleaner than setting a flag? Does it |
| handle things like signals arriving and other things happening |
| in combination correctly? */ |
| stepped_after_stopped_by_watchpoint = 1; |
| break; |
| } |
| ecs->infwait_state = infwait_normal_state; |
| |
| flush_cached_frames (); |
| |
| /* If it's a new process, add it to the thread database */ |
| |
| ecs->new_thread_event = ((ecs->pid != inferior_pid) && !in_thread_list (ecs->pid)); |
| |
| if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
| && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED |
| && ecs->new_thread_event) |
| { |
| add_thread (ecs->pid); |
| |
| printf_filtered ("[New %s]\n", target_pid_or_tid_to_str (ecs->pid)); |
| |
| #if 0 |
| /* NOTE: This block is ONLY meant to be invoked in case of a |
| "thread creation event"! If it is invoked for any other |
| sort of event (such as a new thread landing on a breakpoint), |
| the event will be discarded, which is almost certainly |
| a bad thing! |
| |
| To avoid this, the low-level module (eg. target_wait) |
| should call in_thread_list and add_thread, so that the |
| new thread is known by the time we get here. */ |
| |
| /* We may want to consider not doing a resume here in order |
| to give the user a chance to play with the new thread. |
| It might be good to make that a user-settable option. */ |
| |
| /* At this point, all threads are stopped (happens |
| automatically in either the OS or the native code). |
| Therefore we need to continue all threads in order to |
| make progress. */ |
| |
| target_resume (-1, 0, TARGET_SIGNAL_0); |
| goto wfi_continue; |
| #endif |
| } |
| |
| switch (ecs->ws.kind) |
| { |
| case TARGET_WAITKIND_LOADED: |
| /* Ignore gracefully during startup of the inferior, as it |
| might be the shell which has just loaded some objects, |
| otherwise add the symbols for the newly loaded objects. */ |
| #ifdef SOLIB_ADD |
| if (!stop_soon_quietly) |
| { |
| /* Remove breakpoints, SOLIB_ADD might adjust |
| breakpoint addresses via breakpoint_re_set. */ |
| if (breakpoints_inserted) |
| remove_breakpoints (); |
| |
| /* Check for any newly added shared libraries if we're |
| supposed to be adding them automatically. */ |
| if (auto_solib_add) |
| { |
| /* Switch terminal for any messages produced by |
| breakpoint_re_set. */ |
| target_terminal_ours_for_output (); |
| SOLIB_ADD (NULL, 0, NULL); |
| target_terminal_inferior (); |
| } |
| |
| /* Reinsert breakpoints and continue. */ |
| if (breakpoints_inserted) |
| insert_breakpoints (); |
| } |
| #endif |
| resume (0, TARGET_SIGNAL_0); |
| goto wfi_continue; |
| |
| case TARGET_WAITKIND_SPURIOUS: |
| resume (0, TARGET_SIGNAL_0); |
| goto wfi_continue; |
| |
| case TARGET_WAITKIND_EXITED: |
| target_terminal_ours (); /* Must do this before mourn anyway */ |
| annotate_exited (ecs->ws.value.integer); |
| if (ecs->ws.value.integer) |
| printf_filtered ("\nProgram exited with code 0%o.\n", |
| (unsigned int) ecs->ws.value.integer); |
| else |
| printf_filtered ("\nProgram exited normally.\n"); |
| |
| /* Record the exit code in the convenience variable $_exitcode, so |
| that the user can inspect this again later. */ |
| set_internalvar (lookup_internalvar ("_exitcode"), |
| value_from_longest (builtin_type_int, |
| (LONGEST) ecs->ws.value.integer)); |
| gdb_flush (gdb_stdout); |
| target_mourn_inferior (); |
| singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P*/ |
| stop_print_frame = 0; |
| goto stop_stepping; |
| |
| case TARGET_WAITKIND_SIGNALLED: |
| stop_print_frame = 0; |
| stop_signal = ecs->ws.value.sig; |
| target_terminal_ours (); /* Must do this before mourn anyway */ |
| annotate_signalled (); |
| |
| /* This looks pretty bogus to me. Doesn't TARGET_WAITKIND_SIGNALLED |
| mean it is already dead? This has been here since GDB 2.8, so |
| perhaps it means rms didn't understand unix waitstatuses? |
| For the moment I'm just kludging around this in remote.c |
| rather than trying to change it here --kingdon, 5 Dec 1994. */ |
| target_kill (); /* kill mourns as well */ |
| |
| printf_filtered ("\nProgram terminated with signal "); |
| annotate_signal_name (); |
| printf_filtered ("%s", target_signal_to_name (stop_signal)); |
| annotate_signal_name_end (); |
| printf_filtered (", "); |
| annotate_signal_string (); |
| printf_filtered ("%s", target_signal_to_string (stop_signal)); |
| annotate_signal_string_end (); |
| printf_filtered (".\n"); |
| |
| printf_filtered ("The program no longer exists.\n"); |
| gdb_flush (gdb_stdout); |
| singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P*/ |
| goto stop_stepping; |
| |
| /* The following are the only cases in which we keep going; |
| the above cases end in a continue or goto. */ |
| case TARGET_WAITKIND_FORKED: |
| stop_signal = TARGET_SIGNAL_TRAP; |
| pending_follow.kind = ecs->ws.kind; |
| |
| /* Ignore fork events reported for the parent; we're only |
| interested in reacting to forks of the child. Note that |
| we expect the child's fork event to be available if we |
| waited for it now. */ |
| if (inferior_pid == ecs->pid) |
| { |
| pending_follow.fork_event.saw_parent_fork = 1; |
| pending_follow.fork_event.parent_pid = ecs->pid; |
| pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; |
| goto wfi_continue; |
| } |
| else |
| { |
| pending_follow.fork_event.saw_child_fork = 1; |
| pending_follow.fork_event.child_pid = ecs->pid; |
| pending_follow.fork_event.parent_pid = ecs->ws.value.related_pid; |
| } |
| |
| stop_pc = read_pc_pid (ecs->pid); |
| ecs->saved_inferior_pid = inferior_pid; |
| inferior_pid = ecs->pid; |
| stop_bpstat = bpstat_stop_status |
| (&stop_pc, |
| (DECR_PC_AFTER_BREAK ? |
| (prev_pc != stop_pc - DECR_PC_AFTER_BREAK |
| && currently_stepping (ecs)) |
| : 0) |
| ); |
| ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
| inferior_pid = ecs->saved_inferior_pid; |
| goto process_event_stop_test; |
| |
| /* If this a platform which doesn't allow a debugger to touch a |
| vfork'd inferior until after it exec's, then we'd best keep |
| our fingers entirely off the inferior, other than continuing |
| it. This has the unfortunate side-effect that catchpoints |
| of vforks will be ignored. But since the platform doesn't |
| allow the inferior be touched at vfork time, there's really |
| little choice. */ |
| case TARGET_WAITKIND_VFORKED: |
| stop_signal = TARGET_SIGNAL_TRAP; |
| pending_follow.kind = ecs->ws.kind; |
| |
| /* Is this a vfork of the parent? If so, then give any |
| vfork catchpoints a chance to trigger now. (It's |
| dangerous to do so if the child canot be touched until |
| it execs, and the child has not yet exec'd. We probably |
| should warn the user to that effect when the catchpoint |
| triggers...) */ |
| if (ecs->pid == inferior_pid) |
| { |
| pending_follow.fork_event.saw_parent_fork = 1; |
| pending_follow.fork_event.parent_pid = ecs->pid; |
| pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; |
| } |
| |
| /* If we've seen the child's vfork event but cannot really touch |
| the child until it execs, then we must continue the child now. |
| Else, give any vfork catchpoints a chance to trigger now. */ |
| else |
| { |
| pending_follow.fork_event.saw_child_fork = 1; |
| pending_follow.fork_event.child_pid = ecs->pid; |
| pending_follow.fork_event.parent_pid = ecs->ws.value.related_pid; |
| target_post_startup_inferior (pending_follow.fork_event.child_pid); |
| follow_vfork_when_exec = !target_can_follow_vfork_prior_to_exec (); |
| if (follow_vfork_when_exec) |
| { |
| target_resume (ecs->pid, 0, TARGET_SIGNAL_0); |
| goto wfi_continue; |
| } |
| } |
| |
| stop_pc = read_pc (); |
| stop_bpstat = bpstat_stop_status |
| (&stop_pc, |
| (DECR_PC_AFTER_BREAK ? |
| (prev_pc != stop_pc - DECR_PC_AFTER_BREAK |
| && currently_stepping (ecs)) |
| : 0) |
| ); |
| ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
| goto process_event_stop_test; |
| |
| case TARGET_WAITKIND_EXECD: |
| stop_signal = TARGET_SIGNAL_TRAP; |
| |
| /* Is this a target which reports multiple exec events per actual |
| call to exec()? (HP-UX using ptrace does, for example.) If so, |
| ignore all but the last one. Just resume the exec'r, and wait |
| for the next exec event. */ |
| if (inferior_ignoring_leading_exec_events) |
| { |
| inferior_ignoring_leading_exec_events--; |
| if (pending_follow.kind == TARGET_WAITKIND_VFORKED) |
| ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event.parent_pid); |
| target_resume (ecs->pid, 0, TARGET_SIGNAL_0); |
| goto wfi_continue; |
| } |
| inferior_ignoring_leading_exec_events = |
| target_reported_exec_events_per_exec_call () - 1; |
| |
| pending_follow.execd_pathname = savestring (ecs->ws.value.execd_pathname, |
| strlen (ecs->ws.value.execd_pathname)); |
| |
| /* Did inferior_pid exec, or did a (possibly not-yet-followed) |
| child of a vfork exec? |
| |
| ??rehrauer: This is unabashedly an HP-UX specific thing. On |
| HP-UX, events associated with a vforking inferior come in |
| threes: a vfork event for the child (always first), followed |
| a vfork event for the parent and an exec event for the child. |
| The latter two can come in either order. |
| |
| If we get the parent vfork event first, life's good: We follow |
| either the parent or child, and then the child's exec event is |
| a "don't care". |
| |
| But if we get the child's exec event first, then we delay |
| responding to it until we handle the parent's vfork. Because, |
| otherwise we can't satisfy a "catch vfork". */ |
| if (pending_follow.kind == TARGET_WAITKIND_VFORKED) |
| { |
| pending_follow.fork_event.saw_child_exec = 1; |
| |
| /* On some targets, the child must be resumed before |
| the parent vfork event is delivered. A single-step |
| suffices. */ |
| if (RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK ()) |
| target_resume (ecs->pid, 1, TARGET_SIGNAL_0); |
| /* We expect the parent vfork event to be available now. */ |
| goto wfi_continue; |
| } |
| |
| /* This causes the eventpoints and symbol table to be reset. Must |
| do this now, before trying to determine whether to stop. */ |
| follow_exec (inferior_pid, pending_follow.execd_pathname); |
| free (pending_follow.execd_pathname); |
| |
| stop_pc = read_pc_pid (ecs->pid); |
| ecs->saved_inferior_pid = inferior_pid; |
| inferior_pid = ecs->pid; |
| stop_bpstat = bpstat_stop_status |
| (&stop_pc, |
| (DECR_PC_AFTER_BREAK ? |
| (prev_pc != stop_pc - DECR_PC_AFTER_BREAK |
| && currently_stepping (ecs)) |
| : 0) |
| ); |
| ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
| inferior_pid = ecs->saved_inferior_pid; |
| goto process_event_stop_test; |
| |
| /* These syscall events are returned on HP-UX, as part of its |
| implementation of page-protection-based "hardware" watchpoints. |
| HP-UX has unfortunate interactions between page-protections and |
| some system calls. Our solution is to disable hardware watches |
| when a system call is entered, and reenable them when the syscall |
| completes. The downside of this is that we may miss the precise |
| point at which a watched piece of memory is modified. "Oh well." |
| |
| Note that we may have multiple threads running, which may each |
| enter syscalls at roughly the same time. Since we don't have a |
| good notion currently of whether a watched piece of memory is |
| thread-private, we'd best not have any page-protections active |
| when any thread is in a syscall. Thus, we only want to reenable |
| hardware watches when no threads are in a syscall. |
| |
| Also, be careful not to try to gather much state about a thread |
| that's in a syscall. It's frequently a losing proposition. */ |
| case TARGET_WAITKIND_SYSCALL_ENTRY: |
| number_of_threads_in_syscalls++; |
| if (number_of_threads_in_syscalls == 1) |
| { |
| TARGET_DISABLE_HW_WATCHPOINTS (inferior_pid); |
| } |
| resume (0, TARGET_SIGNAL_0); |
| goto wfi_continue; |
| |
| /* Before examining the threads further, step this thread to |
| get it entirely out of the syscall. (We get notice of the |
| event when the thread is just on the verge of exiting a |
| syscall. Stepping one instruction seems to get it back |
| into user code.) |
| |
| Note that although the logical place to reenable h/w watches |
| is here, we cannot. We cannot reenable them before stepping |
| the thread (this causes the next wait on the thread to hang). |
| |
| Nor can we enable them after stepping until we've done a wait. |
| Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait |
| here, which will be serviced immediately after the target |
| is waited on. */ |
| case TARGET_WAITKIND_SYSCALL_RETURN: |
| target_resume (ecs->pid, 1, TARGET_SIGNAL_0); |
| |
| if (number_of_threads_in_syscalls > 0) |
| { |
| number_of_threads_in_syscalls--; |
| ecs->enable_hw_watchpoints_after_wait = |
| (number_of_threads_in_syscalls == 0); |
| } |
| goto wfi_continue; |
| |
| case TARGET_WAITKIND_STOPPED: |
| stop_signal = ecs->ws.value.sig; |
| break; |
| } |
| |
| /* We may want to consider not doing a resume here in order to give |
| the user a chance to play with the new thread. It might be good |
| to make that a user-settable option. */ |
| |
| /* At this point, all threads are stopped (happens automatically in |
| either the OS or the native code). Therefore we need to continue |
| all threads in order to make progress. */ |
| if (ecs->new_thread_event) |
| { |
| target_resume (-1, 0, TARGET_SIGNAL_0); |
| goto wfi_continue; |
| } |
| |
| stop_pc = read_pc_pid (ecs->pid); |
| |
| /* See if a thread hit a thread-specific breakpoint that was meant for |
| another thread. If so, then step that thread past the breakpoint, |
| and continue it. */ |
| |
| if (stop_signal == TARGET_SIGNAL_TRAP) |
| { |
| if (SOFTWARE_SINGLE_STEP_P && singlestep_breakpoints_inserted_p) |
| ecs->random_signal = 0; |
| else if (breakpoints_inserted |
| && breakpoint_here_p (stop_pc - DECR_PC_AFTER_BREAK)) |
| { |
| ecs->random_signal = 0; |
| if (!breakpoint_thread_match (stop_pc - DECR_PC_AFTER_BREAK, |
| ecs->pid)) |
| { |
| int remove_status; |
| |
| /* Saw a breakpoint, but it was hit by the wrong thread. |
| Just continue. */ |
| write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK, ecs->pid); |
| |
| remove_status = remove_breakpoints (); |
| /* Did we fail to remove breakpoints? If so, try |
| to set the PC past the bp. (There's at least |
| one situation in which we can fail to remove |
| the bp's: On HP-UX's that use ttrace, we can't |
| change the address space of a vforking child |
| process until the child exits (well, okay, not |
| then either :-) or execs. */ |
| if (remove_status != 0) |
| { |
| write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK + 4, ecs->pid); |
| } |
| else |
| { /* Single step */ |
| target_resume (ecs->pid, 1, TARGET_SIGNAL_0); |
| /* FIXME: What if a signal arrives instead of the |
| single-step happening? */ |
| |
| ecs->waiton_pid = ecs->pid; |
| ecs->wp = &(ecs->ws); |
| ecs->infwait_state = infwait_thread_hop_state; |
| goto wfi_continue; |
| } |
| |
| /* We need to restart all the threads now, |
| * unles we're running in scheduler-locked mode. |
| * FIXME: shouldn't we look at currently_stepping ()? |
| */ |
| if (scheduler_mode == schedlock_on) |
| target_resume (ecs->pid, 0, TARGET_SIGNAL_0); |
| else |
| target_resume (-1, 0, TARGET_SIGNAL_0); |
| goto wfi_continue; |
| } |
| else |
| { |
| /* This breakpoint matches--either it is the right |
| thread or it's a generic breakpoint for all threads. |
| Remember that we'll need to step just _this_ thread |
| on any following user continuation! */ |
| thread_step_needed = 1; |
| } |
| } |
| } |
| else |
| ecs->random_signal = 1; |
| |
| /* See if something interesting happened to the non-current thread. If |
| so, then switch to that thread, and eventually give control back to |
| the user. |
| |
| Note that if there's any kind of pending follow (i.e., of a fork, |
| vfork or exec), we don't want to do this now. Rather, we'll let |
| the next resume handle it. */ |
| if ((ecs->pid != inferior_pid) && |
| (pending_follow.kind == TARGET_WAITKIND_SPURIOUS)) |
| { |
| int printed = 0; |
| |
| /* If it's a random signal for a non-current thread, notify user |
| if he's expressed an interest. */ |
| if (ecs->random_signal |
| && signal_print[stop_signal]) |
| { |
| /* ??rehrauer: I don't understand the rationale for this code. If the |
| inferior will stop as a result of this signal, then the act of handling |
| the stop ought to print a message that's couches the stoppage in user |
| terms, e.g., "Stopped for breakpoint/watchpoint". If the inferior |
| won't stop as a result of the signal -- i.e., if the signal is merely |
| a side-effect of something GDB's doing "under the covers" for the |
| user, such as stepping threads over a breakpoint they shouldn't stop |
| for -- then the message seems to be a serious annoyance at best. |
| |
| For now, remove the message altogether. */ |
| #if 0 |
| printed = 1; |
| target_terminal_ours_for_output (); |
| printf_filtered ("\nProgram received signal %s, %s.\n", |
| target_signal_to_name (stop_signal), |
| target_signal_to_string (stop_signal)); |
| gdb_flush (gdb_stdout); |
| #endif |
| } |
| |
| /* If it's not SIGTRAP and not a signal we want to stop for, then |
| continue the thread. */ |
| |
| if (stop_signal != TARGET_SIGNAL_TRAP |
| && !signal_stop[stop_signal]) |
| { |
| if (printed) |
| target_terminal_inferior (); |
| |
| /* Clear the signal if it should not be passed. */ |
| if (signal_program[stop_signal] == 0) |
| stop_signal = TARGET_SIGNAL_0; |
| |
| target_resume (ecs->pid, 0, stop_signal); |
| goto wfi_continue; |
| } |
| |
| /* It's a SIGTRAP or a signal we're interested in. Switch threads, |
| and fall into the rest of wait_for_inferior(). */ |
| |
| /* Save infrun state for the old thread. */ |
| save_infrun_state (inferior_pid, prev_pc, |
| prev_func_start, prev_func_name, |
| trap_expected, step_resume_breakpoint, |
| through_sigtramp_breakpoint, |
| step_range_start, step_range_end, |
| step_frame_address, ecs->handling_longjmp, |
| ecs->another_trap, |
| ecs->stepping_through_solib_after_catch, |
| ecs->stepping_through_solib_catchpoints, |
| ecs->stepping_through_sigtramp); |
| |
| if (may_switch_from_inferior_pid) |
| switched_from_inferior_pid = inferior_pid; |
| |
| inferior_pid = ecs->pid; |
| |
| /* Load infrun state for the new thread. */ |
| load_infrun_state (inferior_pid, &prev_pc, |
| &prev_func_start, &prev_func_name, |
| &trap_expected, &step_resume_breakpoint, |
| &through_sigtramp_breakpoint, |
| &step_range_start, &step_range_end, |
| &step_frame_address, &ecs->handling_longjmp, |
| &ecs->another_trap, |
| &ecs->stepping_through_solib_after_catch, |
| &ecs->stepping_through_solib_catchpoints, |
| &ecs->stepping_through_sigtramp); |
| |
| if (context_hook) |
| context_hook (pid_to_thread_id (ecs->pid)); |
| |
| printf_filtered ("[Switching to %s]\n", target_pid_to_str (ecs->pid)); |
| flush_cached_frames (); |
| } |
| |
| if (SOFTWARE_SINGLE_STEP_P && singlestep_breakpoints_inserted_p) |
| { |
| /* Pull the single step breakpoints out of the target. */ |
| SOFTWARE_SINGLE_STEP (0, 0); |
| singlestep_breakpoints_inserted_p = 0; |
| } |
| |
| /* If PC is pointing at a nullified instruction, then step beyond |
| it so that the user won't be confused when GDB appears to be ready |
| to execute it. */ |
| |
| /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */ |
| if (INSTRUCTION_NULLIFIED) |
| { |
| registers_changed (); |
| target_resume (ecs->pid, 1, TARGET_SIGNAL_0); |
| |
| /* We may have received a signal that we want to pass to |
| the inferior; therefore, we must not clobber the waitstatus |
| in WS. */ |
| |
| ecs->infwait_state = infwait_nullified_state; |
| ecs->waiton_pid = ecs->pid; |
| ecs->wp = &(ecs->tmpstatus); |
| goto wfi_continue; |
| } |
| |
| /* It may not be necessary to disable the watchpoint to stop over |
| it. For example, the PA can (with some kernel cooperation) |
| single step over a watchpoint without disabling the watchpoint. */ |
| if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) |
| { |
| resume (1, 0); |
| goto wfi_continue; |
| } |
| |
| /* It is far more common to need to disable a watchpoint to step |
| the inferior over it. FIXME. What else might a debug |
| register or page protection watchpoint scheme need here? */ |
| if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) |
| { |
| /* At this point, we are stopped at an instruction which has |
| attempted to write to a piece of memory under control of |
| a watchpoint. The instruction hasn't actually executed |
| yet. If we were to evaluate the watchpoint expression |
| now, we would get the old value, and therefore no change |
| would seem to have occurred. |
| |
| In order to make watchpoints work `right', we really need |
| to complete the memory write, and then evaluate the |
| watchpoint expression. The following code does that by |
| removing the watchpoint (actually, all watchpoints and |
| breakpoints), single-stepping the target, re-inserting |
| watchpoints, and then falling through to let normal |
| single-step processing handle proceed. Since this |
| includes evaluating watchpoints, things will come to a |
| stop in the correct manner. */ |
| |
| write_pc (stop_pc - DECR_PC_AFTER_BREAK); |
| |
| remove_breakpoints (); |
| registers_changed (); |
| target_resume (ecs->pid, 1, TARGET_SIGNAL_0); /* Single step */ |
| |
| ecs->waiton_pid = ecs->pid; |
| ecs->wp = &(ecs->ws); |
| ecs->infwait_state = infwait_nonstep_watch_state; |
| goto wfi_continue; |
| } |
| |
| /* It may be possible to simply continue after a watchpoint. */ |
| if (HAVE_CONTINUABLE_WATCHPOINT) |
| STOPPED_BY_WATCHPOINT (ecs->ws); |
| |
| ecs->stop_func_start = 0; |
| ecs->stop_func_end = 0; |
| ecs->stop_func_name = 0; |
| /* Don't care about return value; stop_func_start and stop_func_name |
| will both be 0 if it doesn't work. */ |
| find_pc_partial_function (stop_pc, &ecs->stop_func_name, |
| &ecs->stop_func_start, &ecs->stop_func_end); |
| ecs->stop_func_start += FUNCTION_START_OFFSET; |
| ecs->another_trap = 0; |
| bpstat_clear (&stop_bpstat); |
| stop_step = 0; |
| stop_stack_dummy = 0; |
| stop_print_frame = 1; |
| ecs->random_signal = 0; |
| stopped_by_random_signal = 0; |
| breakpoints_failed = 0; |
| |
| /* Look at the cause of the stop, and decide what to do. |
| The alternatives are: |
| 1) break; to really stop and return to the debugger, |
| 2) drop through to start up again |
| (set ecs->another_trap to 1 to single step once) |
| 3) set ecs->random_signal to 1, and the decision between 1 and 2 |
| will be made according to the signal handling tables. */ |
| |
| /* First, distinguish signals caused by the debugger from signals |
| that have to do with the program's own actions. |
| Note that breakpoint insns may cause SIGTRAP or SIGILL |
| or SIGEMT, depending on the operating system version. |
| Here we detect when a SIGILL or SIGEMT is really a breakpoint |
| and change it to SIGTRAP. */ |
| |
| if (stop_signal == TARGET_SIGNAL_TRAP |
| || (breakpoints_inserted && |
| (stop_signal == TARGET_SIGNAL_ILL |
| || stop_signal == TARGET_SIGNAL_EMT |
| )) |
| || stop_soon_quietly) |
| { |
| if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) |
| { |
| stop_print_frame = 0; |
| goto wfi_break; |
| } |
| if (stop_soon_quietly) |
| goto wfi_break; |
| |
| /* Don't even think about breakpoints |
| if just proceeded over a breakpoint. |
| |
| However, if we are trying to proceed over a breakpoint |
| and end up in sigtramp, then through_sigtramp_breakpoint |
| will be set and we should check whether we've hit the |
| step breakpoint. */ |
| if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected |
| && through_sigtramp_breakpoint == NULL) |
| bpstat_clear (&stop_bpstat); |
| else |
| { |
| /* See if there is a breakpoint at the current PC. */ |
| stop_bpstat = bpstat_stop_status |
| (&stop_pc, |
| (DECR_PC_AFTER_BREAK ? |
| /* Notice the case of stepping through a jump |
| that lands just after a breakpoint. |
| Don't confuse that with hitting the breakpoint. |
| What we check for is that 1) stepping is going on |
| and 2) the pc before the last insn does not match |
| the address of the breakpoint before the current pc |
| and 3) we didn't hit a breakpoint in a signal handler |
| without an intervening stop in sigtramp, which is |
| detected by a new stack pointer value below |
| any usual function calling stack adjustments. */ |
| (currently_stepping (ecs) |
| && prev_pc != stop_pc - DECR_PC_AFTER_BREAK |
| && !(step_range_end |
| && INNER_THAN (read_sp (), (step_sp - 16)))) : |
| 0) |
| ); |
| /* Following in case break condition called a |
| function. */ |
| stop_print_frame = 1; |
| } |
| |
| if (stop_signal == TARGET_SIGNAL_TRAP) |
| ecs->random_signal |
| = !(bpstat_explains_signal (stop_bpstat) |
| || trap_expected |
| || (!CALL_DUMMY_BREAKPOINT_OFFSET_P |
| && PC_IN_CALL_DUMMY (stop_pc, read_sp (), |
| FRAME_FP (get_current_frame ()))) |
| || (step_range_end && step_resume_breakpoint == NULL)); |
| |
| else |
| { |
| ecs->random_signal |
| = !(bpstat_explains_signal (stop_bpstat) |
| /* End of a stack dummy. Some systems (e.g. Sony |
| news) give another signal besides SIGTRAP, so |
| check here as well as above. */ |
| || (!CALL_DUMMY_BREAKPOINT_OFFSET_P |
| && PC_IN_CALL_DUMMY (stop_pc, read_sp (), |
| FRAME_FP (get_current_frame ()))) |
| ); |
| if (!ecs->random_signal) |
| stop_signal = TARGET_SIGNAL_TRAP; |
| } |
| } |
| |
| /* When we reach this point, we've pretty much decided |
| that the reason for stopping must've been a random |
| (unexpected) signal. */ |
| |
| else |
| ecs->random_signal = 1; |
| /* If a fork, vfork or exec event was seen, then there are two |
| possible responses we can make: |
| |
| 1. If a catchpoint triggers for the event (ecs->random_signal == 0), |
| then we must stop now and issue a prompt. We will resume |
| the inferior when the user tells us to. |
| 2. If no catchpoint triggers for the event (ecs->random_signal == 1), |
| then we must resume the inferior now and keep checking. |
| |
| In either case, we must take appropriate steps to "follow" the |
| the fork/vfork/exec when the inferior is resumed. For example, |
| if follow-fork-mode is "child", then we must detach from the |
| parent inferior and follow the new child inferior. |
| |
| In either case, setting pending_follow causes the next resume() |
| to take the appropriate following action. */ |
| process_event_stop_test: |
| if (ecs->ws.kind == TARGET_WAITKIND_FORKED) |
| { |
| if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */ |
| { |
| trap_expected = 1; |
| stop_signal = TARGET_SIGNAL_0; |
| goto keep_going; |
| } |
| } |
| else if (ecs->ws.kind == TARGET_WAITKIND_VFORKED) |
| { |
| if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */ |
| { |
| stop_signal = TARGET_SIGNAL_0; |
| goto keep_going; |
| } |
| } |
| else if (ecs->ws.kind == TARGET_WAITKIND_EXECD) |
| { |
| pending_follow.kind = ecs->ws.kind; |
| if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */ |
| { |
| trap_expected = 1; |
| stop_signal = TARGET_SIGNAL_0; |
| goto keep_going; |
| } |
| } |
| |
| /* For the program's own signals, act according to |
| the signal handling tables. */ |
| |
| if (ecs->random_signal) |
| { |
| /* Signal not for debugging purposes. */ |
| int printed = 0; |
| |
| stopped_by_random_signal = 1; |
| |
| if (signal_print[stop_signal]) |
| { |
| printed = 1; |
| target_terminal_ours_for_output (); |
| annotate_signal (); |
| printf_filtered ("\nProgram received signal "); |
| annotate_signal_name (); |
| printf_filtered ("%s", target_signal_to_name (stop_signal)); |
| annotate_signal_name_end (); |
| printf_filtered (", "); |
| annotate_signal_string (); |
| printf_filtered ("%s", target_signal_to_string (stop_signal)); |
| annotate_signal_string_end (); |
| printf_filtered (".\n"); |
| gdb_flush (gdb_stdout); |
| } |
| if (signal_stop[stop_signal]) |
| goto wfi_break; |
| /* If not going to stop, give terminal back |
| if we took it away. */ |
| else if (printed) |
| target_terminal_inferior (); |
| |
| /* Clear the signal if it should not be passed. */ |
| if (signal_program[stop_signal] == 0) |
| stop_signal = TARGET_SIGNAL_0; |
| |
| /* If we're in the middle of a "next" command, let the code for |
| stepping over a function handle this. pai/1997-09-10 |
| |
| A previous comment here suggested it was possible to change |
| this to jump to keep_going in all cases. */ |
| |
| if (step_over_calls > 0) |
| goto step_over_function; |
| else |
| goto check_sigtramp2; |
| } |
| |
| /* Handle cases caused by hitting a breakpoint. */ |
| { |
| CORE_ADDR jmp_buf_pc; |
| struct bpstat_what what; |
| |
| what = bpstat_what (stop_bpstat); |
| |
| if (what.call_dummy) |
| { |
| stop_stack_dummy = 1; |
| #ifdef HP_OS_BUG |
| trap_expected_after_continue = 1; |
| #endif |
| } |
| |
| switch (what.main_action) |
| { |
| case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
| /* If we hit the breakpoint at longjmp, disable it for the |
| duration of this command. Then, install a temporary |
| breakpoint at the target of the jmp_buf. */ |
| disable_longjmp_breakpoint (); |
| remove_breakpoints (); |
| breakpoints_inserted = 0; |
| if (!GET_LONGJMP_TARGET (&jmp_buf_pc)) |
| goto keep_going; |
| |
| /* Need to blow away step-resume breakpoint, as it |
| interferes with us */ |
| if (step_resume_breakpoint != NULL) |
| { |
| delete_breakpoint (step_resume_breakpoint); |
| step_resume_breakpoint = NULL; |
| } |
| /* Not sure whether we need to blow this away too, but probably |
| it is like the step-resume breakpoint. */ |
| if (through_sigtramp_breakpoint != NULL) |
| { |
| delete_breakpoint (through_sigtramp_breakpoint); |
| through_sigtramp_breakpoint = NULL; |
| } |
| |
| #if 0 |
| /* FIXME - Need to implement nested temporary breakpoints */ |
| if (step_over_calls > 0) |
| set_longjmp_resume_breakpoint (jmp_buf_pc, |
| get_current_frame ()); |
| else |
| #endif /* 0 */ |
| set_longjmp_resume_breakpoint (jmp_buf_pc, NULL); |
| ecs->handling_longjmp = 1; /* FIXME */ |
| goto keep_going; |
| |
| case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
| case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: |
| remove_breakpoints (); |
| breakpoints_inserted = 0; |
| #if 0 |
| /* FIXME - Need to implement nested temporary breakpoints */ |
| if (step_over_calls |
| && (INNER_THAN (FRAME_FP (get_current_frame ()), |
| step_frame_address))) |
| { |
| ecs->another_trap = 1; |
| goto keep_going; |
| } |
| #endif /* 0 */ |
| disable_longjmp_breakpoint (); |
| ecs->handling_longjmp = 0; /* FIXME */ |
| if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) |
| break; |
| /* else fallthrough */ |
| |
| case BPSTAT_WHAT_SINGLE: |
| if (breakpoints_inserted) |
| { |
| thread_step_needed = 1; |
| remove_breakpoints (); |
| } |
| breakpoints_inserted = 0; |
| ecs->another_trap = 1; |
| /* Still need to check other stuff, at least the case |
| where we are stepping and step out of the right range. */ |
| break; |
| |
| case BPSTAT_WHAT_STOP_NOISY: |
| stop_print_frame = 1; |
| |
| /* We are about to nuke the step_resume_breakpoint and |
| through_sigtramp_breakpoint via the cleanup chain, so |
| no need to worry about it here. */ |
| |
| goto stop_stepping; |
| |
| case BPSTAT_WHAT_STOP_SILENT: |
| stop_print_frame = 0; |
| |
| /* We are about to nuke the step_resume_breakpoint and |
| through_sigtramp_breakpoint via the cleanup chain, so |
| no need to worry about it here. */ |
| |
| goto stop_stepping; |
| |
| case BPSTAT_WHAT_STEP_RESUME: |
| /* This proably demands a more elegant solution, but, yeah |
| right... |
| |
| This function's use of the simple variable |
| step_resume_breakpoint doesn't seem to accomodate |
| simultaneously active step-resume bp's, although the |
| breakpoint list certainly can. |
| |
| If we reach here and step_resume_breakpoint is already |
| NULL, then apparently we have multiple active |
| step-resume bp's. We'll just delete the breakpoint we |
| stopped at, and carry on. */ |
| if (step_resume_breakpoint == NULL) |
| { |
| step_resume_breakpoint = |
| bpstat_find_step_resume_breakpoint (stop_bpstat); |
| } |
| delete_breakpoint (step_resume_breakpoint); |
| step_resume_breakpoint = NULL; |
| break; |
| |
| case BPSTAT_WHAT_THROUGH_SIGTRAMP: |
| if (through_sigtramp_breakpoint) |
| delete_breakpoint (through_sigtramp_breakpoint); |
| through_sigtramp_breakpoint = NULL; |
| |
| /* If were waiting for a trap, hitting the step_resume_break |
| doesn't count as getting it. */ |
| if (trap_expected) |
| ecs->another_trap = 1; |
| break; |
| |
| case BPSTAT_WHAT_CHECK_SHLIBS: |
| case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: |
| #ifdef SOLIB_ADD |
| { |
| /* Remove breakpoints, we eventually want to step over the |
| shlib event breakpoint, and SOLIB_ADD might adjust |
| breakpoint addresses via breakpoint_re_set. */ |
| if (breakpoints_inserted) |
| remove_breakpoints (); |
| breakpoints_inserted = 0; |
| |
| /* Check for any newly added shared libraries if we're |
| supposed to be adding them automatically. */ |
| if (auto_solib_add) |
| { |
| /* Switch terminal for any messages produced by |
| breakpoint_re_set. */ |
| target_terminal_ours_for_output (); |
| SOLIB_ADD (NULL, 0, NULL); |
| target_terminal_inferior (); |
| } |
| |
| /* Try to reenable shared library breakpoints, additional |
| code segments in shared libraries might be mapped in now. */ |
| re_enable_breakpoints_in_shlibs (); |
| |
| /* If requested, stop when the dynamic linker notifies |
| gdb of events. This allows the user to get control |
| and place breakpoints in initializer routines for |
| dynamically loaded objects (among other things). */ |
| if (stop_on_solib_events) |
| { |
| stop_print_frame = 0; |
| goto stop_stepping; |
| } |
| |
| /* If we stopped due to an explicit catchpoint, then the |
| (see above) call to SOLIB_ADD pulled in any symbols |
| from a newly-loaded library, if appropriate. |
| |
| We do want the inferior to stop, but not where it is |
| now, which is in the dynamic linker callback. Rather, |
| we would like it stop in the user's program, just after |
| the call that caused this catchpoint to trigger. That |
| gives the user a more useful vantage from which to |
| examine their program's state. */ |
| else if (what.main_action == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) |
| { |
| /* ??rehrauer: If I could figure out how to get the |
| right return PC from here, we could just set a temp |
| breakpoint and resume. I'm not sure we can without |
| cracking open the dld's shared libraries and sniffing |
| their unwind tables and text/data ranges, and that's |
| not a terribly portable notion. |
| |
| Until that time, we must step the inferior out of the |
| dld callback, and also out of the dld itself (and any |
| code or stubs in libdld.sl, such as "shl_load" and |
| friends) until we reach non-dld code. At that point, |
| we can stop stepping. */ |
| bpstat_get_triggered_catchpoints (stop_bpstat, |
| &ecs->stepping_through_solib_catchpoints); |
| ecs->stepping_through_solib_after_catch = 1; |
| |
| /* Be sure to lift all breakpoints, so the inferior does |
| actually step past this point... */ |
| ecs->another_trap = 1; |
| break; |
| } |
| else |
| { |
| /* We want to step over this breakpoint, then keep going. */ |
| ecs->another_trap = 1; |
| break; |
| } |
| } |
| #endif |
| break; |
| |
| case BPSTAT_WHAT_LAST: |
| /* Not a real code, but listed here to shut up gcc -Wall. */ |
| |
| case BPSTAT_WHAT_KEEP_CHECKING: |
| break; |
| } |
| } |
| |
| /* We come here if we hit a breakpoint but should not |
| stop for it. Possibly we also were stepping |
| and should stop for that. So fall through and |
| test for stepping. But, if not stepping, |
| do not stop. */ |
| |
| /* Are we stepping to get the inferior out of the dynamic |
| linker's hook (and possibly the dld itself) after catching |
| a shlib event? */ |
| if (ecs->stepping_through_solib_after_catch) |
| { |
| #if defined(SOLIB_ADD) |
| /* Have we reached our destination? If not, keep going. */ |
| if (SOLIB_IN_DYNAMIC_LINKER (ecs->pid, stop_pc)) |
| { |
| ecs->another_trap = 1; |
| goto keep_going; |
| } |
| #endif |
| /* Else, stop and report the catchpoint(s) whose triggering |
| caused us to begin stepping. */ |
| ecs->stepping_through_solib_after_catch = 0; |
| bpstat_clear (&stop_bpstat); |
| stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints); |
| bpstat_clear (&ecs->stepping_through_solib_catchpoints); |
| stop_print_frame = 1; |
| goto stop_stepping; |
| } |
| |
| if (!CALL_DUMMY_BREAKPOINT_OFFSET_P) |
| { |
| /* This is the old way of detecting the end of the stack dummy. |
| An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets |
| handled above. As soon as we can test it on all of them, all |
| architectures should define it. */ |
| |
| /* If this is the breakpoint at the end of a stack dummy, |
| just stop silently, unless the user was doing an si/ni, in which |
| case she'd better know what she's doing. */ |
| |
| if (CALL_DUMMY_HAS_COMPLETED (stop_pc, read_sp (), |
| FRAME_FP (get_current_frame ())) |
| && !step_range_end) |
| { |
| stop_print_frame = 0; |
| stop_stack_dummy = 1; |
| #ifdef HP_OS_BUG |
| trap_expected_after_continue = 1; |
| #endif |
| goto wfi_break; |
| } |
| } |
| |
| if (step_resume_breakpoint) |
| /* Having a step-resume breakpoint overrides anything |
| else having to do with stepping commands until |
| that breakpoint is reached. */ |
| /* I'm not sure whether this needs to be check_sigtramp2 or |
| whether it could/should be keep_going. */ |
| goto check_sigtramp2; |
| |
| if (step_range_end == 0) |
| /* Likewise if we aren't even stepping. */ |
| /* I'm not sure whether this needs to be check_sigtramp2 or |
| whether it could/should be keep_going. */ |
| goto check_sigtramp2; |
| |
| /* If stepping through a line, keep going if still within it. |
| |
| Note that step_range_end is the address of the first instruction |
| beyond the step range, and NOT the address of the last instruction |
| within it! */ |
| if (stop_pc >= step_range_start |
| && stop_pc < step_range_end) |
| { |
| /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal. |
| So definately need to check for sigtramp here. */ |
| goto check_sigtramp2; |
| } |
| |
| /* We stepped out of the stepping range. */ |
| |
| /* If we are stepping at the source level and entered the runtime |
| loader dynamic symbol resolution code, we keep on single stepping |
| until we exit the run time loader code and reach the callee's |
| address. */ |
| if (step_over_calls < 0 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc)) |
| goto keep_going; |
| |
| /* We can't update step_sp every time through the loop, because |
| reading the stack pointer would slow down stepping too much. |
| But we can update it every time we leave the step range. */ |
| ecs->update_step_sp = 1; |
| |
| /* Did we just take a signal? */ |
| if (IN_SIGTRAMP (stop_pc, ecs->stop_func_name) |
| && !IN_SIGTRAMP (prev_pc, prev_func_name) |
| && INNER_THAN (read_sp (), step_sp)) |
| { |
| /* We've just taken a signal; go until we are back to |
| the point where we took it and one more. */ |
| |
| /* Note: The test above succeeds not only when we stepped |
| into a signal handler, but also when we step past the last |
| statement of a signal handler and end up in the return stub |
| of the signal handler trampoline. To distinguish between |
| these two cases, check that the frame is INNER_THAN the |
| previous one below. pai/1997-09-11 */ |
| |
| |
| { |
| CORE_ADDR current_frame = FRAME_FP (get_current_frame ()); |
| |
| if (INNER_THAN (current_frame, step_frame_address)) |
| { |
| /* We have just taken a signal; go until we are back to |
| the point where we took it and one more. */ |
| |
| /* This code is needed at least in the following case: |
| The user types "next" and then a signal arrives (before |
| the "next" is done). */ |
| |
| /* Note that if we are stopped at a breakpoint, then we need |
| the step_resume breakpoint to override any breakpoints at |
| the same location, so that we will still step over the |
| breakpoint even though the signal happened. */ |
| struct symtab_and_line sr_sal; |
| |
| INIT_SAL (&sr_sal); |
| sr_sal.symtab = NULL; |
| sr_sal.line = 0; |
| sr_sal.pc = prev_pc; |
| /* We could probably be setting the frame to |
| step_frame_address; I don't think anyone thought to |
| try it. */ |
| step_resume_breakpoint = |
| set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); |
| if (breakpoints_inserted) |
| insert_breakpoints (); |
| } |
| else |
| { |
| /* We just stepped out of a signal handler and into |
| its calling trampoline. |
| |
| Normally, we'd jump to step_over_function from |
| here, but for some reason GDB can't unwind the |
| stack correctly to find the real PC for the point |
| user code where the signal trampoline will return |
| -- FRAME_SAVED_PC fails, at least on HP-UX 10.20. |
| But signal trampolines are pretty small stubs of |
| code, anyway, so it's OK instead to just |
| single-step out. Note: assuming such trampolines |
| don't exhibit recursion on any platform... */ |
| find_pc_partial_function (stop_pc, &ecs->stop_func_name, |
| &ecs->stop_func_start, |
| &ecs->stop_func_end); |
| /* Readjust stepping range */ |
| step_range_start = ecs->stop_func_start; |
| step_range_end = ecs->stop_func_end; |
| ecs->stepping_through_sigtramp = 1; |
| } |
| } |
| |
| |
| /* If this is stepi or nexti, make sure that the stepping range |
| gets us past that instruction. */ |
| if (step_range_end == 1) |
| /* FIXME: Does this run afoul of the code below which, if |
| we step into the middle of a line, resets the stepping |
| range? */ |
| step_range_end = (step_range_start = prev_pc) + 1; |
| |
| ecs->remove_breakpoints_on_following_step = 1; |
| goto keep_going; |
| } |
| |
| if (stop_pc == ecs->stop_func_start /* Quick test */ |
| || (in_prologue (stop_pc, ecs->stop_func_start) && |
| !IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) |
| || IN_SOLIB_CALL_TRAMPOLINE (stop_pc, ecs->stop_func_name) |
| || ecs->stop_func_name == 0) |
| { |
| /* It's a subroutine call. */ |
| |
| if (step_over_calls == 0) |
| { |
| /* I presume that step_over_calls is only 0 when we're |
| supposed to be stepping at the assembly language level |
| ("stepi"). Just stop. */ |
| stop_step = 1; |
| goto wfi_break; |
| } |
| |
| if (step_over_calls > 0 || IGNORE_HELPER_CALL (stop_pc)) |
| /* We're doing a "next". */ |
| goto step_over_function; |
| |
| /* If we are in a function call trampoline (a stub between |
| the calling routine and the real function), locate the real |
| function. That's what tells us (a) whether we want to step |
| into it at all, and (b) what prologue we want to run to |
| the end of, if we do step into it. */ |
| tmp = SKIP_TRAMPOLINE_CODE (stop_pc); |
| if (tmp != 0) |
| ecs->stop_func_start = tmp; |
| else |
| { |
| tmp = DYNAMIC_TRAMPOLINE_NEXTPC (stop_pc); |
| if (tmp) |
| { |
| struct symtab_and_line xxx; |
| /* Why isn't this s_a_l called "sr_sal", like all of the |
| other s_a_l's where this code is duplicated? */ |
| INIT_SAL (&xxx); /* initialize to zeroes */ |
| xxx.pc = tmp; |
| xxx.section = find_pc_overlay (xxx.pc); |
| step_resume_breakpoint = |
| set_momentary_breakpoint (xxx, NULL, bp_step_resume); |
| insert_breakpoints (); |
| goto keep_going; |
| } |
| } |
| |
| /* If we have line number information for the function we |
| are thinking of stepping into, step into it. |
| |
| If there are several symtabs at that PC (e.g. with include |
| files), just want to know whether *any* of them have line |
| numbers. find_pc_line handles this. */ |
| { |
| struct symtab_and_line tmp_sal; |
| |
| tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
| if (tmp_sal.line != 0) |
| goto step_into_function; |
| } |
| |
| step_over_function: |
| /* A subroutine call has happened. */ |
| { |
| /* Set a special breakpoint after the return */ |
| struct symtab_and_line sr_sal; |
| |
| INIT_SAL (&sr_sal); |
| sr_sal.symtab = NULL; |
| sr_sal.line = 0; |
| |
| /* If we came here after encountering a signal in the middle of |
| a "next", use the stashed-away previous frame pc */ |
| sr_sal.pc |
| = stopped_by_random_signal |
| ? prev_pc |
| : ADDR_BITS_REMOVE (SAVED_PC_AFTER_CALL (get_current_frame ())); |
| |
| step_resume_breakpoint = |
| set_momentary_breakpoint (sr_sal, |
| stopped_by_random_signal ? |
| NULL : get_current_frame (), |
| bp_step_resume); |
| |
| /* We've just entered a callee, and we wish to resume until |
| it returns to the caller. Setting a step_resume bp on |
| the return PC will catch a return from the callee. |
| |
| However, if the callee is recursing, we want to be |
| careful not to catch returns of those recursive calls, |
| but of THIS instance of the call. |
| |
| To do this, we set the step_resume bp's frame to our |
| current caller's frame (step_frame_address, which is |
| set by the "next" or "until" command, before execution |
| begins). |
| |
| But ... don't do it if we're single-stepping out of a |
| sigtramp, because the reason we're single-stepping is |
| precisely because unwinding is a problem (HP-UX 10.20, |
| e.g.) and the frame address is likely to be incorrect. |
| No danger of sigtramp recursion. */ |
| |
| if (ecs->stepping_through_sigtramp) |
| { |
| step_resume_breakpoint->frame = (CORE_ADDR) NULL; |
| ecs->stepping_through_sigtramp = 0; |
| } |
| else if (!IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal.pc)) |
| step_resume_breakpoint->frame = step_frame_address; |
| |
| if (breakpoints_inserted) |
| insert_breakpoints (); |
| } |
| goto keep_going; |
| |
| step_into_function: |
| /* Subroutine call with source code we should not step over. |
| Do step to the first line of code in it. */ |
| { |
| struct symtab *s; |
| |
| s = find_pc_symtab (stop_pc); |
| if (s && s->language != language_asm) |
| ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start); |
| } |
| ecs->sal = find_pc_line (ecs->stop_func_start, 0); |
| /* Use the step_resume_break to step until |
| the end of the prologue, even if that involves jumps |
| (as it seems to on the vax under 4.2). */ |
| /* If the prologue ends in the middle of a source line, |
| continue to the end of that source line (if it is still |
| within the function). Otherwise, just go to end of prologue. */ |
| #ifdef PROLOGUE_FIRSTLINE_OVERLAP |
| /* no, don't either. It skips any code that's |
| legitimately on the first line. */ |
| #else |
| if (ecs->sal.end && ecs->sal.pc != ecs->stop_func_start && ecs->sal.end < ecs->stop_func_end) |
| ecs->stop_func_start = ecs->sal.end; |
| #endif |
| |
| if (ecs->stop_func_start == stop_pc) |
| { |
| /* We are already there: stop now. */ |
| stop_step = 1; |
| goto wfi_break; |
| } |
| else |
| /* Put the step-breakpoint there and go until there. */ |
| { |
| struct symtab_and_line sr_sal; |
| |
| INIT_SAL (&sr_sal); /* initialize to zeroes */ |
| sr_sal.pc = ecs->stop_func_start; |
| sr_sal.section = find_pc_overlay (ecs->stop_func_start); |
| /* Do not specify what the fp should be when we stop |
| since on some machines the prologue |
| is where the new fp value is established. */ |
| step_resume_breakpoint = |
| set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); |
| if (breakpoints_inserted) |
| insert_breakpoints (); |
| |
| /* And make sure stepping stops right away then. */ |
| step_range_end = step_range_start; |
| } |
| goto keep_going; |
| } |
| |
| /* We've wandered out of the step range. */ |
| |
| ecs->sal = find_pc_line (stop_pc, 0); |
| |
| if (step_range_end == 1) |
| { |
| /* It is stepi or nexti. We always want to stop stepping after |
| one instruction. */ |
| stop_step = 1; |
| goto wfi_break; |
| } |
| |
| /* If we're in the return path from a shared library trampoline, |
| we want to proceed through the trampoline when stepping. */ |
| if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) |
| { |
| CORE_ADDR tmp; |
| |
| /* Determine where this trampoline returns. */ |
| tmp = SKIP_TRAMPOLINE_CODE (stop_pc); |
| |
| /* Only proceed through if we know where it's going. */ |
| if (tmp) |
| { |
| /* And put the step-breakpoint there and go until there. */ |
| struct symtab_and_line sr_sal; |
| |
| INIT_SAL (&sr_sal); /* initialize to zeroes */ |
| sr_sal.pc = tmp; |
| sr_sal.section = find_pc_overlay (sr_sal.pc); |
| /* Do not specify what the fp should be when we stop |
| since on some machines the prologue |
| is where the new fp value is established. */ |
| step_resume_breakpoint = |
| set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); |
| if (breakpoints_inserted) |
| insert_breakpoints (); |
| |
| /* Restart without fiddling with the step ranges or |
| other state. */ |
| goto keep_going; |
| } |
| } |
| |
| if (ecs->sal.line == 0) |
| { |
| /* We have no line number information. That means to stop |
| stepping (does this always happen right after one instruction, |
| when we do "s" in a function with no line numbers, |
| or can this happen as a result of a return or longjmp?). */ |
| stop_step = 1; |
| goto wfi_break; |
| } |
| |
| if ((stop_pc == ecs->sal.pc) |
| && (ecs->current_line != ecs->sal.line || ecs->current_symtab != ecs->sal.symtab)) |
| { |
| /* We are at the start of a different line. So stop. Note that |
| we don't stop if we step into the middle of a different line. |
| That is said to make things like for (;;) statements work |
| better. */ |
| stop_step = 1; |
| goto wfi_break; |
| } |
| |
| /* We aren't done stepping. |
| |
| Optimize by setting the stepping range to the line. |
| (We might not be in the original line, but if we entered a |
| new line in mid-statement, we continue stepping. This makes |
| things like for(;;) statements work better.) */ |
| |
| if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end) |
| { |
| /* If this is the last line of the function, don't keep stepping |
| (it would probably step us out of the function). |
| This is particularly necessary for a one-line function, |
| in which after skipping the prologue we better stop even though |
| we will be in mid-line. */ |
| stop_step = 1; |
| goto wfi_break; |
| } |
| step_range_start = ecs->sal.pc; |
| step_range_end = ecs->sal.end; |
| step_frame_address = FRAME_FP (get_current_frame ()); |
| ecs->current_line = ecs->sal.line; |
| ecs->current_symtab = ecs->sal.symtab; |
| |
| /* In the case where we just stepped out of a function into the middle |
| of a line of the caller, continue stepping, but step_frame_address |
| must be modified to current frame */ |
| { |
| CORE_ADDR current_frame = FRAME_FP (get_current_frame ()); |
| if (!(INNER_THAN (current_frame, step_frame_address))) |
| step_frame_address = current_frame; |
| } |
| |
| |
| goto keep_going; |
| |
| check_sigtramp2: |
| if (trap_expected |
| && IN_SIGTRAMP (stop_pc, ecs->stop_func_name) |
| && !IN_SIGTRAMP (prev_pc, prev_func_name) |
| && INNER_THAN (read_sp (), step_sp)) |
| { |
| /* What has happened here is that we have just stepped the inferior |
| with a signal (because it is a signal which shouldn't make |
| us stop), thus stepping into sigtramp. |
| |
| So we need to set a step_resume_break_address breakpoint |
| and continue until we hit it, and then step. FIXME: This should |
| be more enduring than a step_resume breakpoint; we should know |
| that we will later need to keep going rather than re-hitting |
| the breakpoint here (see testsuite/gdb.t06/signals.exp where |
| it says "exceedingly difficult"). */ |
| struct symtab_and_line sr_sal; |
| |
| INIT_SAL (&sr_sal); /* initialize to zeroes */ |
| sr_sal.pc = prev_pc; |
| sr_sal.section = find_pc_overlay (sr_sal.pc); |
| /* We perhaps could set the frame if we kept track of what |
| the frame corresponding to prev_pc was. But we don't, |
| so don't. */ |
| through_sigtramp_breakpoint = |
| set_momentary_breakpoint (sr_sal, NULL, bp_through_sigtramp); |
| if (breakpoints_inserted) |
| insert_breakpoints (); |
| |
| ecs->remove_breakpoints_on_following_step = 1; |
| ecs->another_trap = 1; |
| } |
| |
| keep_going: |
| /* Come to this label when you need to resume the inferior. |
| It's really much cleaner to do a goto than a maze of if-else |
| conditions. */ |
| |
| /* ??rehrauer: ttrace on HP-UX theoretically allows one to debug |
| a vforked child beetween its creation and subsequent exit or |
| call to exec(). However, I had big problems in this rather |
| creaky exec engine, getting that to work. The fundamental |
| problem is that I'm trying to debug two processes via an |
| engine that only understands a single process with possibly |
| multiple threads. |
| |
| Hence, this spot is known to have problems when |
| target_can_follow_vfork_prior_to_exec returns 1. */ |
| |
| /* Save the pc before execution, to compare with pc after stop. */ |
| prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ |
| prev_func_start = ecs->stop_func_start; /* Ok, since if DECR_PC_AFTER |
| BREAK is defined, the |
| original pc would not have |
| been at the start of a |
| function. */ |
| prev_func_name = ecs->stop_func_name; |
| |
| if (ecs->update_step_sp) |
| step_sp = read_sp (); |
| ecs->update_step_sp = 0; |
| |
| /* If we did not do break;, it means we should keep |
| running the inferior and not return to debugger. */ |
| |
| if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) |
| { |
| /* We took a signal (which we are supposed to pass through to |
| the inferior, else we'd have done a break above) and we |
| haven't yet gotten our trap. Simply continue. */ |
| resume (currently_stepping (ecs), stop_signal); |
| } |
| else |
| { |
| /* Either the trap was not expected, but we are continuing |
| anyway (the user asked that this signal be passed to the |
| child) |
| -- or -- |
| The signal was SIGTRAP, e.g. it was our signal, but we |
| decided we should resume from it. |
| |
| We're going to run this baby now! |
| |
| Insert breakpoints now, unless we are trying |
| to one-proceed past a breakpoint. */ |
| /* If we've just finished a special step resume and we don't |
| want to hit a breakpoint, pull em out. */ |
| if (step_resume_breakpoint == NULL |
| && through_sigtramp_breakpoint == NULL |
| && ecs->remove_breakpoints_on_following_step) |
| { |
| ecs->remove_breakpoints_on_following_step = 0; |
| remove_breakpoints (); |
| breakpoints_inserted = 0; |
| } |
| else if (!breakpoints_inserted && |
| (through_sigtramp_breakpoint != NULL || !ecs->another_trap)) |
| { |
| breakpoints_failed = insert_breakpoints (); |
| if (breakpoints_failed) |
| goto wfi_break; |
| breakpoints_inserted = 1; |
| } |
| |
| trap_expected = ecs->another_trap; |
| |
| /* Do not deliver SIGNAL_TRAP (except when the user |
| explicitly specifies that such a signal should be |
| delivered to the target program). |
| |
| Typically, this would occure when a user is debugging a |
| target monitor on a simulator: the target monitor sets a |
| breakpoint; the simulator encounters this break-point and |
| halts the simulation handing control to GDB; GDB, noteing |
| that the break-point isn't valid, returns control back to |
| the simulator; the simulator then delivers the hardware |
| equivalent of a SIGNAL_TRAP to the program being |
| debugged. */ |
| |
| if (stop_signal == TARGET_SIGNAL_TRAP |
| && !signal_program[stop_signal]) |
| stop_signal = TARGET_SIGNAL_0; |
| |
| #ifdef SHIFT_INST_REGS |
| /* I'm not sure when this following segment applies. I do know, |
| now, that we shouldn't rewrite the regs when we were stopped |
| by a random signal from the inferior process. */ |
| /* FIXME: Shouldn't this be based on the valid bit of the SXIP? |
| (this is only used on the 88k). */ |
| |
| if (!bpstat_explains_signal (stop_bpstat) |
| && (stop_signal != TARGET_SIGNAL_CHLD) |
| && !stopped_by_random_signal) |
| SHIFT_INST_REGS (); |
| #endif /* SHIFT_INST_REGS */ |
| |
| resume (currently_stepping (ecs), stop_signal); |
| } |
| |
| /* Former continues in the main loop goto here. */ |
| wfi_continue: |
| /* This used to be at the top of the loop. */ |
| if (ecs->infwait_state == infwait_normal_state) |
| { |
| overlay_cache_invalid = 1; |
| |
| /* We have to invalidate the registers BEFORE calling |
| target_wait because they can be loaded from the target |
| while in target_wait. This makes remote debugging a bit |
| more efficient for those targets that provide critical |
| registers as part of their normal status mechanism. */ |
| |
| registers_changed (); |
| ecs->waiton_pid = -1; |
| ecs->wp = &(ecs->ws); |
| } |
| /* This is the old end of the while loop. Let everybody know |
| we want to wait for the inferior some more and get called |
| again soon. */ |
| ecs->wait_some_more = 1; |
| return; |
| } |
| |
| /* Former breaks in the main loop goto here. */ |
| wfi_break: |
| |
| stop_stepping: |
| if (target_has_execution) |
| { |
| /* Are we stopping for a vfork event? We only stop when we see |
| the child's event. However, we may not yet have seen the |
| parent's event. And, inferior_pid is still set to the parent's |
| pid, until we resume again and follow either the parent or child. |
| |
| To ensure that we can really touch inferior_pid (aka, the |
| parent process) -- which calls to functions like read_pc |
| implicitly do -- wait on the parent if necessary. */ |
| if ((pending_follow.kind == TARGET_WAITKIND_VFORKED) |
| && !pending_follow.fork_event.saw_parent_fork) |
| { |
| int parent_pid; |
| |
| do |
| { |
| if (target_wait_hook) |
| parent_pid = target_wait_hook (-1, &(ecs->ws)); |
| else |
| parent_pid = target_wait (-1, &(ecs->ws)); |
| } |
| while (parent_pid != inferior_pid); |
| } |
| |
| /* Assuming the inferior still exists, set these up for next |
| time, just like we did above if we didn't break out of the |
| loop. */ |
| prev_pc = read_pc (); |
| prev_func_start = ecs->stop_func_start; |
| prev_func_name = ecs->stop_func_name; |
| } |
| /* Let callers know we don't want to wait for the inferior anymore. */ |
| ecs->wait_some_more = 0; |
| } |
| |
| /* Are we in the middle of stepping? */ |
| |
| static int |
| currently_stepping (ecs) |
| struct execution_control_state *ecs; |
| { |
| return ((through_sigtramp_breakpoint == NULL |
| && !ecs->handling_longjmp |
| && ((step_range_end && step_resume_breakpoint == NULL) |
| || trap_expected)) |
| || ecs->stepping_through_solib_after_catch |
| || bpstat_should_step ()); |
| } |
| |
| /* This function returns TRUE if ep is an internal breakpoint |
| set to catch generic shared library (aka dynamically-linked |
| library) events. (This is *NOT* the same as a catchpoint for a |
| shlib event. The latter is something a user can set; this is |
| something gdb sets for its own use, and isn't ever shown to a |
| user.) */ |
| static int |
| is_internal_shlib_eventpoint (ep) |
| struct breakpoint *ep; |
| { |
| return |
| (ep->type == bp_shlib_event) |
| ; |
| } |
| |
| /* This function returns TRUE if bs indicates that the inferior |
| stopped due to a shared library (aka dynamically-linked library) |
| event. */ |
| static int |
| stopped_for_internal_shlib_event (bs) |
| bpstat bs; |
| { |
| /* Note that multiple eventpoints may've caused the stop. Any |
| that are associated with shlib events will be accepted. */ |
| for (; bs != NULL; bs = bs->next) |
| { |
| if ((bs->breakpoint_at != NULL) |
| && is_internal_shlib_eventpoint (bs->breakpoint_at)) |
| return 1; |
| } |
| |
| /* If we get here, then no candidate was found. */ |
| return 0; |
| } |
| |
| /* This function returns TRUE if bs indicates that the inferior |
| stopped due to a shared library (aka dynamically-linked library) |
| event caught by a catchpoint. |
| |
| If TRUE, cp_p is set to point to the catchpoint. |
| |
| Else, the value of cp_p is undefined. */ |
| static int |
| stopped_for_shlib_catchpoint (bs, cp_p) |
| bpstat bs; |
| struct breakpoint **cp_p; |
| { |
| /* Note that multiple eventpoints may've caused the stop. Any |
| that are associated with shlib events will be accepted. */ |
| *cp_p = NULL; |
| |
| for (; bs != NULL; bs = bs->next) |
| { |
| if ((bs->breakpoint_at != NULL) |
| && ep_is_shlib_catchpoint (bs->breakpoint_at)) |
| { |
| *cp_p = bs->breakpoint_at; |
| return 1; |
| } |
| } |
| |
| /* If we get here, then no candidate was found. */ |
| return 0; |
| } |
| |
| |
| /* Here to return control to GDB when the inferior stops for real. |
| Print appropriate messages, remove breakpoints, give terminal our modes. |
| |
| STOP_PRINT_FRAME nonzero means print the executing frame |
| (pc, function, args, file, line number and line text). |
| BREAKPOINTS_FAILED nonzero means stop was due to error |
| attempting to insert breakpoints. */ |
| |
| void |
| normal_stop () |
| { |
| /* As with the notification of thread events, we want to delay |
| notifying the user that we've switched thread context until |
| the inferior actually stops. |
| |
| (Note that there's no point in saying anything if the inferior |
| has exited!) */ |
| if (may_switch_from_inferior_pid |
| && (switched_from_inferior_pid != inferior_pid) |
| && target_has_execution) |
| { |
| target_terminal_ours_for_output (); |
| printf_filtered ("[Switched to %s]\n", |
| target_pid_or_tid_to_str (inferior_pid)); |
| switched_from_inferior_pid = inferior_pid; |
| } |
| |
| /* Make sure that the current_frame's pc is correct. This |
| is a correction for setting up the frame info before doing |
| DECR_PC_AFTER_BREAK */ |
| if (target_has_execution && get_current_frame ()) |
| (get_current_frame ())->pc = read_pc (); |
| |
| if (breakpoints_failed) |
| { |
| target_terminal_ours_for_output (); |
| print_sys_errmsg ("ptrace", breakpoints_failed); |
| printf_filtered ("Stopped; cannot insert breakpoints.\n\ |
| The same program may be running in another process.\n"); |
| } |
| |
| if (target_has_execution && breakpoints_inserted) |
| { |
| if (remove_breakpoints ()) |
| { |
| target_terminal_ours_for_output (); |
| printf_filtered ("Cannot remove breakpoints because "); |
| printf_filtered ("program is no longer writable.\n"); |
| printf_filtered ("It might be running in another process.\n"); |
| printf_filtered ("Further execution is probably impossible.\n"); |
| } |
| } |
| breakpoints_inserted = 0; |
| |
| /* Delete the breakpoint we stopped at, if it wants to be deleted. |
| Delete any breakpoint that is to be deleted at the next stop. */ |
| |
| breakpoint_auto_delete (stop_bpstat); |
| |
| /* If an auto-display called a function and that got a signal, |
| delete that auto-display to avoid an infinite recursion. */ |
| |
| if (stopped_by_random_signal) |
| disable_current_display (); |
| |
| /* Don't print a message if in the middle of doing a "step n" |
| operation for n > 1 */ |
| if (step_multi && stop_step) |
| goto done; |
| |
| target_terminal_ours (); |
| |
| /* Did we stop because the user set the stop_on_solib_events |
| variable? (If so, we report this as a generic, "Stopped due |
| to shlib event" message.) */ |
| if (stopped_for_internal_shlib_event (stop_bpstat)) |
| { |
| printf_filtered ("Stopped due to shared library event\n"); |
| } |
| |
| /* Look up the hook_stop and run it if it exists. */ |
| |
| if (stop_command && stop_command->hook) |
| { |
| catch_errors (hook_stop_stub, stop_command->hook, |
| "Error while running hook_stop:\n", RETURN_MASK_ALL); |
| } |
| |
| if (!target_has_stack) |
| { |
| |
| goto done; |
| } |
| |
| /* Select innermost stack frame - i.e., current frame is frame 0, |
| and current location is based on that. |
| Don't do this on return from a stack dummy routine, |
| or if the program has exited. */ |
| |
| if (!stop_stack_dummy) |
| { |
| select_frame (get_current_frame (), 0); |
| |
| /* Print current location without a level number, if |
| we have changed functions or hit a breakpoint. |
| Print source line if we have one. |
| bpstat_print() contains the logic deciding in detail |
| what to print, based on the event(s) that just occurred. */ |
| |
| if (stop_print_frame) |
| { |
| int bpstat_ret; |
| int source_flag; |
| |
| bpstat_ret = bpstat_print (stop_bpstat); |
| /* bpstat_print() returned one of: |
| -1: Didn't print anything |
| 0: Printed preliminary "Breakpoint n, " message, desires |
| location tacked on |
| 1: Printed something, don't tack on location */ |
| |
| if (bpstat_ret == -1) |
| if (stop_step |
| && step_frame_address == FRAME_FP (get_current_frame ()) |
| && step_start_function == find_pc_function (stop_pc)) |
| source_flag = -1; /* finished step, just print source line */ |
| else |
| source_flag = 1; /* print location and source line */ |
| else if (bpstat_ret == 0) /* hit bpt, desire location */ |
| source_flag = 1; /* print location and source line */ |
| else /* bpstat_ret == 1, hit bpt, do not desire location */ |
| source_flag = -1; /* just print source line */ |
| |
| /* The behavior of this routine with respect to the source |
| flag is: |
| -1: Print only source line |
| 0: Print only location |
| 1: Print location and source line */ |
| show_and_print_stack_frame (selected_frame, -1, source_flag); |
| |
| /* Display the auto-display expressions. */ |
| do_displays (); |
| } |
| } |
| |
| /* Save the function value return registers, if we care. |
| We might be about to restore their previous contents. */ |
| if (proceed_to_finish) |
| read_register_bytes (0, stop_registers, REGISTER_BYTES); |
| |
| if (stop_stack_dummy) |
| { |
| /* Pop the empty frame that contains the stack dummy. |
| POP_FRAME ends with a setting of the current frame, so we |
| can use that next. */ |
| POP_FRAME; |
| /* Set stop_pc to what it was before we called the function. |
| Can't rely on restore_inferior_status because that only gets |
| called if we don't stop in the called function. */ |
| stop_pc = read_pc (); |
| select_frame (get_current_frame (), 0); |
| } |
| |
| |
| TUIDO (((TuiOpaqueFuncPtr) tui_vCheckDataValues, selected_frame)); |
| |
| done: |
| annotate_stopped (); |
| } |
| |
| static int |
| hook_stop_stub (cmd) |
| PTR cmd; |
| { |
| execute_user_command ((struct cmd_list_element *) cmd, 0); |
| return (0); |
| } |
| |
| int |
| signal_stop_state (signo) |
| int signo; |
| { |
| return signal_stop[signo]; |
| } |
| |
| int |
| signal_print_state (signo) |
| int signo; |
| { |
| return signal_print[signo]; |
| } |
| |
| int |
| signal_pass_state (signo) |
| int signo; |
| { |
| return signal_program[signo]; |
| } |
| |
| static void |
| sig_print_header () |
| { |
| printf_filtered ("\ |
| Signal Stop\tPrint\tPass to program\tDescription\n"); |
| } |
| |
| static void |
| sig_print_info (oursig) |
| enum target_signal oursig; |
| { |
| char *name = target_signal_to_name (oursig); |
| int name_padding = 13 - strlen (name); |
| if (name_padding <= 0) |
| name_padding = 0; |
| |
| printf_filtered ("%s", name); |
| printf_filtered ("%*.*s ", name_padding, name_padding, |
| " "); |
| printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
| printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); |
| printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); |
| printf_filtered ("%s\n", target_signal_to_string (oursig)); |
| } |
| |
| /* Specify how various signals in the inferior should be handled. */ |
| |
| static void |
| handle_command (args, from_tty) |
| char *args; |
| int from_tty; |
| { |
| char **argv; |
| int digits, wordlen; |
| int sigfirst, signum, siglast; |
| enum target_signal oursig; |
| int allsigs; |
| int nsigs; |
| unsigned char *sigs; |
| struct cleanup *old_chain; |
| |
| if (args == NULL) |
| { |
| error_no_arg ("signal to handle"); |
| } |
| |
| /* Allocate and zero an array of flags for which signals to handle. */ |
| |
| nsigs = (int) TARGET_SIGNAL_LAST; |
| sigs = (unsigned char *) alloca (nsigs); |
| memset (sigs, 0, nsigs); |
| |
| /* Break the command line up into args. */ |
| |
| argv = buildargv (args); |
| if (argv == NULL) |
| { |
| nomem (0); |
| } |
| old_chain = make_cleanup_freeargv (argv); |
| |
| /* Walk through the args, looking for signal oursigs, signal names, and |
| actions. Signal numbers and signal names may be interspersed with |
| actions, with the actions being performed for all signals cumulatively |
| specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
| |
| while (*argv != NULL) |
| { |
| wordlen = strlen (*argv); |
| for (digits = 0; isdigit ((*argv)[digits]); digits++) |
| {; |
| } |
| allsigs = 0; |
| sigfirst = siglast = -1; |
| |
| if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) |
| { |
| /* Apply action to all signals except those used by the |
| debugger. Silently skip those. */ |
| allsigs = 1; |
| sigfirst = 0; |
| siglast = nsigs - 1; |
| } |
| else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) |
| { |
| SET_SIGS (nsigs, sigs, signal_stop); |
| SET_SIGS (nsigs, sigs, signal_print); |
| } |
| else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) |
| { |
| UNSET_SIGS (nsigs, sigs, signal_program); |
| } |
| else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) |
| { |
| SET_SIGS (nsigs, sigs, signal_print); |
| } |
| else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) |
| { |
| SET_SIGS (nsigs, sigs, signal_program); |
| } |
| else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) |
| { |
| UNSET_SIGS (nsigs, sigs, signal_stop); |
| } |
| else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) |
| { |
| SET_SIGS (nsigs, sigs, signal_program); |
| } |
| else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) |
| { |
| UNSET_SIGS (nsigs, sigs, signal_print); |
| UNSET_SIGS (nsigs, sigs, signal_stop); |
| } |
| else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) |
| { |
| UNSET_SIGS (nsigs, sigs, signal_program); |
| } |
| else if (digits > 0) |
| { |
| /* It is numeric. The numeric signal refers to our own |
| internal signal numbering from target.h, not to host/target |
| signal number. This is a feature; users really should be |
| using symbolic names anyway, and the common ones like |
| SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ |
| |
| sigfirst = siglast = (int) |
| target_signal_from_command (atoi (*argv)); |
| if ((*argv)[digits] == '-') |
| { |
| siglast = (int) |
| target_signal_from_command (atoi ((*argv) + digits + 1)); |
| } |
| if (sigfirst > siglast) |
| { |
| /* Bet he didn't figure we'd think of this case... */ |
| signum = sigfirst; |
| sigfirst = siglast; |
| siglast = signum; |
| } |
| } |
| else |
| { |
| oursig = target_signal_from_name (*argv); |
| if (oursig != TARGET_SIGNAL_UNKNOWN) |
| { |
| sigfirst = siglast = (int) oursig; |
| } |
| else |
| { |
| /* Not a number and not a recognized flag word => complain. */ |
| error ("Unrecognized or ambiguous flag word: \"%s\".", *argv); |
| } |
| } |
| |
| /* If any signal numbers or symbol names were found, set flags for |
| which signals to apply actions to. */ |
| |
| for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) |
| { |
| switch ((enum target_signal) signum) |
| { |
| case TARGET_SIGNAL_TRAP: |
| case TARGET_SIGNAL_INT: |
| if (!allsigs && !sigs[signum]) |
| { |
| if (query ("%s is used by the debugger.\n\ |
| Are you sure you want to change it? ", |
| target_signal_to_name |
| ((enum target_signal) signum))) |
| { |
| sigs[signum] = 1; |
| } |
| else |
| { |
| printf_unfiltered ("Not confirmed, unchanged.\n"); |
| gdb_flush (gdb_stdout); |
| } |
| } |
| break; |
| case TARGET_SIGNAL_0: |
| case TARGET_SIGNAL_DEFAULT: |
| case TARGET_SIGNAL_UNKNOWN: |
| /* Make sure that "all" doesn't print these. */ |
| break; |
| default: |
| sigs[signum] = 1; |
| break; |
| } |
| } |
| |
| argv++; |
| } |
| |
| target_notice_signals (inferior_pid); |
| |
| if (from_tty) |
| { |
| /* Show the results. */ |
| sig_print_header (); |
| for (signum = 0; signum < nsigs; signum++) |
| { |
| if (sigs[signum]) |
| { |
| sig_print_info (signum); |
| } |
| } |
| } |
| |
| do_cleanups (old_chain); |
| } |
| |
| static void |
| xdb_handle_command (args, from_tty) |
| char *args; |
| int from_tty; |
| { |
| char **argv; |
| struct cleanup *old_chain; |
| |
| /* Break the command line up into args. */ |
| |
| argv = buildargv (args); |
| if (argv == NULL) |
| { |
| nomem (0); |
| } |
| old_chain = make_cleanup_freeargv (argv); |
| if (argv[1] != (char *) NULL) |
| { |
| char *argBuf; |
| int bufLen; |
| |
| bufLen = strlen (argv[0]) + 20; |
| argBuf = (char *) xmalloc (bufLen); |
| if (argBuf) |
| { |
| int validFlag = 1; |
| enum target_signal oursig; |
| |
| oursig = target_signal_from_name (argv[0]); |
| memset (argBuf, 0, bufLen); |
| if (strcmp (argv[1], "Q") == 0) |
| sprintf (argBuf, "%s %s", argv[0], "noprint"); |
| else |
| { |
| if (strcmp (argv[1], "s") == 0) |
| { |
| if (!signal_stop[oursig]) |
| sprintf (argBuf, "%s %s", argv[0], "stop"); |
| else |
| sprintf (argBuf, "%s %s", argv[0], "nostop"); |
| } |
| else if (strcmp (argv[1], "i") == 0) |
| { |
| if (!signal_program[oursig]) |
| sprintf (argBuf, "%s %s", argv[0], "pass"); |
| else |
| sprintf (argBuf, "%s %s", argv[0], "nopass"); |
| } |
| else if (strcmp (argv[1], "r") == 0) |
| { |
| if (!signal_print[oursig]) |
| sprintf (argBuf, "%s %s", argv[0], "print"); |
| else |
| sprintf (argBuf, "%s %s", argv[0], "noprint"); |
| } |
| else |
| validFlag = 0; |
| } |
| if (validFlag) |
| handle_command (argBuf, from_tty); |
| else |
| printf_filtered ("Invalid signal handling flag.\n"); |
| if (argBuf) |
| free (argBuf); |
| } |
| } |
| do_cleanups (old_chain); |
| } |
| |
| /* Print current contents of the tables set by the handle command. |
| It is possible we should just be printing signals actually used |
| by the current target (but for things to work right when switching |
| targets, all signals should be in the signal tables). */ |
| |
| static void |
| signals_info (signum_exp, from_tty) |
| char *signum_exp; |
| int from_tty; |
| { |
| enum target_signal oursig; |
| sig_print_header (); |
| |
| if (signum_exp) |
| { |
| /* First see if this is a symbol name. */ |
| oursig = target_signal_from_name (signum_exp); |
| if (oursig == TARGET_SIGNAL_UNKNOWN) |
| { |
| /* No, try numeric. */ |
| oursig = |
| target_signal_from_command (parse_and_eval_address (signum_exp)); |
| } |
| sig_print_info (oursig); |
| return; |
| } |
| |
| printf_filtered ("\n"); |
| /* These ugly casts brought to you by the native VAX compiler. */ |
| for (oursig = TARGET_SIGNAL_FIRST; |
| (int) oursig < (int) TARGET_SIGNAL_LAST; |
| oursig = (enum target_signal) ((int) oursig + 1)) |
| { |
| QUIT; |
| |
| if (oursig != TARGET_SIGNAL_UNKNOWN |
| && oursig != TARGET_SIGNAL_DEFAULT |
| && oursig != TARGET_SIGNAL_0) |
| sig_print_info (oursig); |
| } |
| |
| printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); |
| } |
| |
| struct inferior_status |
| { |
| enum target_signal stop_signal; |
| CORE_ADDR stop_pc; |
| bpstat stop_bpstat; |
| int stop_step; |
| int stop_stack_dummy; |
| int stopped_by_random_signal; |
| int trap_expected; |
| CORE_ADDR step_range_start; |
| CORE_ADDR step_range_end; |
| CORE_ADDR step_frame_address; |
| int step_over_calls; |
| CORE_ADDR step_resume_break_address; |
| int stop_after_trap; |
| int stop_soon_quietly; |
| CORE_ADDR selected_frame_address; |
| char *stop_registers; |
| |
| /* These are here because if call_function_by_hand has written some |
| registers and then decides to call error(), we better not have changed |
| any registers. */ |
| char *registers; |
| |
| int selected_level; |
| int breakpoint_proceeded; |
| int restore_stack_info; |
| int proceed_to_finish; |
| }; |
| |
| |
| static struct inferior_status *xmalloc_inferior_status PARAMS ((void)); |
| static struct inferior_status * |
| xmalloc_inferior_status () |
| { |
| struct inferior_status *inf_status; |
| inf_status = xmalloc (sizeof (struct inferior_status)); |
| inf_status->stop_registers = xmalloc (REGISTER_BYTES); |
| inf_status->registers = xmalloc (REGISTER_BYTES); |
| return inf_status; |
| } |
| |
| static void free_inferior_status PARAMS ((struct inferior_status *)); |
| static void |
| free_inferior_status (inf_status) |
| struct inferior_status *inf_status; |
| { |
| free (inf_status->registers); |
| free (inf_status->stop_registers); |
| free (inf_status); |
| } |
| |
| void |
| write_inferior_status_register (inf_status, regno, val) |
| struct inferior_status *inf_status; |
| int regno; |
| LONGEST val; |
| { |
| int size = REGISTER_RAW_SIZE(regno); |
| void *buf = alloca (size); |
| store_signed_integer (buf, size, val); |
| memcpy (&inf_status->registers[REGISTER_BYTE (regno)], buf, size); |
| } |
| |
| |
| |
| /* Save all of the information associated with the inferior<==>gdb |
| connection. INF_STATUS is a pointer to a "struct inferior_status" |
| (defined in inferior.h). */ |
| |
| struct inferior_status * |
| save_inferior_status (restore_stack_info) |
| int restore_stack_info; |
| { |
| struct inferior_status *inf_status = xmalloc_inferior_status (); |
| |
| inf_status->stop_signal = stop_signal; |
| inf_status->stop_pc = stop_pc; |
| inf_status->stop_step = stop_step; |
| inf_status->stop_stack_dummy = stop_stack_dummy; |
| inf_status->stopped_by_random_signal = stopped_by_random_signal; |
| inf_status->trap_expected = trap_expected; |
| inf_status->step_range_start = step_range_start; |
| inf_status->step_range_end = step_range_end; |
| inf_status->step_frame_address = step_frame_address; |
| inf_status->step_over_calls = step_over_calls; |
| inf_status->stop_after_trap = stop_after_trap; |
| inf_status->stop_soon_quietly = stop_soon_quietly; |
| /* Save original bpstat chain here; replace it with copy of chain. |
| If caller's caller is walking the chain, they'll be happier if we |
| hand them back the original chain when restore_inferior_status is |
| called. */ |
| inf_status->stop_bpstat = stop_bpstat; |
| stop_bpstat = bpstat_copy (stop_bpstat); |
| inf_status->breakpoint_proceeded = breakpoint_proceeded; |
| inf_status->restore_stack_info = restore_stack_info; |
| inf_status->proceed_to_finish = proceed_to_finish; |
| |
| memcpy (inf_status->stop_registers, stop_registers, REGISTER_BYTES); |
| |
| read_register_bytes (0, inf_status->registers, REGISTER_BYTES); |
| |
| record_selected_frame (&(inf_status->selected_frame_address), |
| &(inf_status->selected_level)); |
| return inf_status; |
| } |
| |
| struct restore_selected_frame_args |
| { |
| CORE_ADDR frame_address; |
| int level; |
| }; |
| |
| static int restore_selected_frame PARAMS ((PTR)); |
| |
| static int |
| restore_selected_frame (args) |
| PTR args; |
| { |
| struct restore_selected_frame_args *fr = |
| (struct restore_selected_frame_args *) args; |
| struct frame_info *frame; |
| int level = fr->level; |
| |
| frame = find_relative_frame (get_current_frame (), &level); |
| |
| /* If inf_status->selected_frame_address is NULL, there was no |
| previously selected frame. */ |
| if (frame == NULL || |
| /* FRAME_FP (frame) != fr->frame_address || */ |
| /* elz: deleted this check as a quick fix to the problem that |
| for function called by hand gdb creates no internal frame |
| structure and the real stack and gdb's idea of stack are |
| different if nested calls by hands are made. |
| |
| mvs: this worries me. */ |
| level != 0) |
| { |
| warning ("Unable to restore previously selected frame.\n"); |
| return 0; |
| } |
| |
| select_frame (frame, fr->level); |
| |
| return (1); |
| } |
| |
| void |
| restore_inferior_status (inf_status) |
| struct inferior_status *inf_status; |
| { |
| stop_signal = inf_status->stop_signal; |
| stop_pc = inf_status->stop_pc; |
| stop_step = inf_status->stop_step; |
| stop_stack_dummy = inf_status->stop_stack_dummy; |
| stopped_by_random_signal = inf_status->stopped_by_random_signal; |
| trap_expected = inf_status->trap_expected; |
| step_range_start = inf_status->step_range_start; |
| step_range_end = inf_status->step_range_end; |
| step_frame_address = inf_status->step_frame_address; |
| step_over_calls = inf_status->step_over_calls; |
| stop_after_trap = inf_status->stop_after_trap; |
| stop_soon_quietly = inf_status->stop_soon_quietly; |
| bpstat_clear (&stop_bpstat); |
| stop_bpstat = inf_status->stop_bpstat; |
| breakpoint_proceeded = inf_status->breakpoint_proceeded; |
| proceed_to_finish = inf_status->proceed_to_finish; |
| |
| /* FIXME: Is the restore of stop_registers always needed */ |
| memcpy (stop_registers, inf_status->stop_registers, REGISTER_BYTES); |
| |
| /* The inferior can be gone if the user types "print exit(0)" |
| (and perhaps other times). */ |
| if (target_has_execution) |
| write_register_bytes (0, inf_status->registers, REGISTER_BYTES); |
| |
| /* FIXME: If we are being called after stopping in a function which |
| is called from gdb, we should not be trying to restore the |
| selected frame; it just prints a spurious error message (The |
| message is useful, however, in detecting bugs in gdb (like if gdb |
| clobbers the stack)). In fact, should we be restoring the |
| inferior status at all in that case? . */ |
| |
| if (target_has_stack && inf_status->restore_stack_info) |
| { |
| struct restore_selected_frame_args fr; |
| fr.level = inf_status->selected_level; |
| fr.frame_address = inf_status->selected_frame_address; |
| /* The point of catch_errors is that if the stack is clobbered, |
| walking the stack might encounter a garbage pointer and error() |
| trying to dereference it. */ |
| if (catch_errors (restore_selected_frame, &fr, |
| "Unable to restore previously selected frame:\n", |
| RETURN_MASK_ERROR) == 0) |
| /* Error in restoring the selected frame. Select the innermost |
| frame. */ |
| |
| |
| select_frame (get_current_frame (), 0); |
| |
| } |
| |
| free_inferior_status (inf_status); |
| } |
| |
| void |
| discard_inferior_status (inf_status) |
| struct inferior_status *inf_status; |
| { |
| /* See save_inferior_status for info on stop_bpstat. */ |
| bpstat_clear (&inf_status->stop_bpstat); |
| free_inferior_status (inf_status); |
| } |
| |
| static void |
| set_follow_fork_mode_command (arg, from_tty, c) |
| char *arg; |
| int from_tty; |
| struct cmd_list_element *c; |
| { |
| if (!STREQ (arg, "parent") && |
| !STREQ (arg, "child") && |
| !STREQ (arg, "both") && |
| !STREQ (arg, "ask")) |
| error ("follow-fork-mode must be one of \"parent\", \"child\", \"both\" or \"ask\"."); |
| |
| if (follow_fork_mode_string != NULL) |
| free (follow_fork_mode_string); |
| follow_fork_mode_string = savestring (arg, strlen (arg)); |
| } |
| |
| |
| |
| static void build_infrun PARAMS ((void)); |
| static void |
| build_infrun () |
| { |
| stop_registers = xmalloc (REGISTER_BYTES); |
| } |
| |
| |
| void |
| _initialize_infrun () |
| { |
| register int i; |
| register int numsigs; |
| struct cmd_list_element *c; |
| |
| build_infrun (); |
| |
| register_gdbarch_swap (&stop_registers, sizeof (stop_registers), NULL); |
| register_gdbarch_swap (NULL, 0, build_infrun); |
| |
| add_info ("signals", signals_info, |
| "What debugger does when program gets various signals.\n\ |
| Specify a signal as argument to print info on that signal only."); |
| add_info_alias ("handle", "signals", 0); |
| |
| add_com ("handle", class_run, handle_command, |
| concat ("Specify how to handle a signal.\n\ |
| Args are signals and actions to apply to those signals.\n\ |
| Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
| from 1-15 are allowed for compatibility with old versions of GDB.\n\ |
| Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ |
| The special arg \"all\" is recognized to mean all signals except those\n\ |
| used by the debugger, typically SIGTRAP and SIGINT.\n", |
| "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
| \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
| Stop means reenter debugger if this signal happens (implies print).\n\ |
| Print means print a message if this signal happens.\n\ |
| Pass means let program see this signal; otherwise program doesn't know.\n\ |
| Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ |
| Pass and Stop may be combined.", NULL)); |
| if (xdb_commands) |
| { |
| add_com ("lz", class_info, signals_info, |
| "What debugger does when program gets various signals.\n\ |
| Specify a signal as argument to print info on that signal only."); |
| add_com ("z", class_run, xdb_handle_command, |
| concat ("Specify how to handle a signal.\n\ |
| Args are signals and actions to apply to those signals.\n\ |
| Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
| from 1-15 are allowed for compatibility with old versions of GDB.\n\ |
| Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ |
| The special arg \"all\" is recognized to mean all signals except those\n\ |
| used by the debugger, typically SIGTRAP and SIGINT.\n", |
| "Recognized actions include \"s\" (toggles between stop and nostop), \n\ |
| \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
| nopass), \"Q\" (noprint)\n\ |
| Stop means reenter debugger if this signal happens (implies print).\n\ |
| Print means print a message if this signal happens.\n\ |
| Pass means let program see this signal; otherwise program doesn't know.\n\ |
| Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ |
| Pass and Stop may be combined.", NULL)); |
| } |
| |
| if (!dbx_commands) |
| stop_command = add_cmd ("stop", class_obscure, not_just_help_class_command, |
| "There is no `stop' command, but you can set a hook on `stop'.\n\ |
| This allows you to set a list of commands to be run each time execution\n\ |
| of the program stops.", &cmdlist); |
| |
| numsigs = (int) TARGET_SIGNAL_LAST; |
| signal_stop = (unsigned char *) |
| xmalloc (sizeof (signal_stop[0]) * numsigs); |
| signal_print = (unsigned char *) |
| xmalloc (sizeof (signal_print[0]) * numsigs); |
| signal_program = (unsigned char *) |
| xmalloc (sizeof (signal_program[0]) * numsigs); |
| for (i = 0; i < numsigs; i++) |
| { |
| signal_stop[i] = 1; |
| signal_print[i] = 1; |
| signal_program[i] = 1; |
| } |
| |
| /* Signals caused by debugger's own actions |
| should not be given to the program afterwards. */ |
| signal_program[TARGET_SIGNAL_TRAP] = 0; |
| signal_program[TARGET_SIGNAL_INT] = 0; |
| |
| /* Signals that are not errors should not normally enter the debugger. */ |
| signal_stop[TARGET_SIGNAL_ALRM] = 0; |
| signal_print[TARGET_SIGNAL_ALRM] = 0; |
| signal_stop[TARGET_SIGNAL_VTALRM] = 0; |
| signal_print[TARGET_SIGNAL_VTALRM] = 0; |
| signal_stop[TARGET_SIGNAL_PROF] = 0; |
| signal_print[TARGET_SIGNAL_PROF] = 0; |
| signal_stop[TARGET_SIGNAL_CHLD] = 0; |
| signal_print[TARGET_SIGNAL_CHLD] = 0; |
| signal_stop[TARGET_SIGNAL_IO] = 0; |
| signal_print[TARGET_SIGNAL_IO] = 0; |
| signal_stop[TARGET_SIGNAL_POLL] = 0; |
| signal_print[TARGET_SIGNAL_POLL] = 0; |
| signal_stop[TARGET_SIGNAL_URG] = 0; |
| signal_print[TARGET_SIGNAL_URG] = 0; |
| signal_stop[TARGET_SIGNAL_WINCH] = 0; |
| signal_print[TARGET_SIGNAL_WINCH] = 0; |
| |
| /* These signals are used internally by user-level thread |
| implementations. (See signal(5) on Solaris.) Like the above |
| signals, a healthy program receives and handles them as part of |
| its normal operation. */ |
| signal_stop[TARGET_SIGNAL_LWP] = 0; |
| signal_print[TARGET_SIGNAL_LWP] = 0; |
| signal_stop[TARGET_SIGNAL_WAITING] = 0; |
| signal_print[TARGET_SIGNAL_WAITING] = 0; |
| signal_stop[TARGET_SIGNAL_CANCEL] = 0; |
| signal_print[TARGET_SIGNAL_CANCEL] = 0; |
| |
| #ifdef SOLIB_ADD |
| add_show_from_set |
| (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger, |
| (char *) &stop_on_solib_events, |
| "Set stopping for shared library events.\n\ |
| If nonzero, gdb will give control to the user when the dynamic linker\n\ |
| notifies gdb of shared library events. The most common event of interest\n\ |
| to the user would be loading/unloading of a new library.\n", |
| &setlist), |
| &showlist); |
| #endif |
| |
| c = add_set_enum_cmd ("follow-fork-mode", |
| class_run, |
| follow_fork_mode_kind_names, |
| (char *) &follow_fork_mode_string, |
| /* ??rehrauer: The "both" option is broken, by what may be a 10.20 |
| kernel problem. It's also not terribly useful without a GUI to |
| help the user drive two debuggers. So for now, I'm disabling |
| the "both" option. */ |
| /* "Set debugger response to a program call of fork \ |
| or vfork.\n\ |
| A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
| parent - the original process is debugged after a fork\n\ |
| child - the new process is debugged after a fork\n\ |
| both - both the parent and child are debugged after a fork\n\ |
| ask - the debugger will ask for one of the above choices\n\ |
| For \"both\", another copy of the debugger will be started to follow\n\ |
| the new child process. The original debugger will continue to follow\n\ |
| the original parent process. To distinguish their prompts, the\n\ |
| debugger copy's prompt will be changed.\n\ |
| For \"parent\" or \"child\", the unfollowed process will run free.\n\ |
| By default, the debugger will follow the parent process.", |
| */ |
| "Set debugger response to a program call of fork \ |
| or vfork.\n\ |
| A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
| parent - the original process is debugged after a fork\n\ |
| child - the new process is debugged after a fork\n\ |
| ask - the debugger will ask for one of the above choices\n\ |
| For \"parent\" or \"child\", the unfollowed process will run free.\n\ |
| By default, the debugger will follow the parent process.", |
| &setlist); |
| /* c->function.sfunc = ;*/ |
| add_show_from_set (c, &showlist); |
| |
| set_follow_fork_mode_command ("parent", 0, NULL); |
| |
| c = add_set_enum_cmd ("scheduler-locking", class_run, |
| scheduler_enums, /* array of string names */ |
| (char *) &scheduler_mode, /* current mode */ |
| "Set mode for locking scheduler during execution.\n\ |
| off == no locking (threads may preempt at any time)\n\ |
| on == full locking (no thread except the current thread may run)\n\ |
| step == scheduler locked during every single-step operation.\n\ |
| In this mode, no other thread may run during a step command.\n\ |
| Other threads may run while stepping over a function call ('next').", |
| &setlist); |
| |
| c->function.sfunc = set_schedlock_func; /* traps on target vector */ |
| add_show_from_set (c, &showlist); |
| } |