| /* Darwin support for GDB, the GNU debugger. |
| Copyright (C) 2008 Free Software Foundation, Inc. |
| |
| Contributed by AdaCore. |
| |
| 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 3 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, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include "defs.h" |
| #include "top.h" |
| #include "inferior.h" |
| #include "target.h" |
| #include "symfile.h" |
| #include "symtab.h" |
| #include "objfiles.h" |
| #include "gdb.h" |
| #include "gdbcmd.h" |
| #include "gdbcore.h" |
| #include "gdbthread.h" |
| #include "regcache.h" |
| #include "event-top.h" |
| #include "inf-loop.h" |
| #include "gdb_stat.h" |
| #include "exceptions.h" |
| #include "inf-child.h" |
| #include "value.h" |
| #include "arch-utils.h" |
| #include "bfd.h" |
| |
| #include <sys/ptrace.h> |
| #include <sys/signal.h> |
| #include <machine/setjmp.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| #include <signal.h> |
| #include <string.h> |
| #include <ctype.h> |
| #include <sys/param.h> |
| #include <sys/sysctl.h> |
| #include <sys/proc.h> |
| |
| #include <mach/mach_error.h> |
| #include <mach/mach_vm.h> |
| #include <mach/mach_init.h> |
| #include <mach/vm_map.h> |
| #include <mach/task.h> |
| #include <mach/mach_port.h> |
| #include <mach/thread_act.h> |
| #include <mach/port.h> |
| |
| #include "darwin-nat.h" |
| |
| /* Quick overview. |
| Darwin kernel is Mach + BSD derived kernel. Note that they share the |
| same memory space and are linked together (ie there is no micro-kernel). |
| |
| Although ptrace(2) is available on Darwin, it is not complete. We have |
| to use Mach calls to read and write memory and to modify registers. We |
| also use Mach to get inferior faults. As we cannot use select(2) or |
| signals with Mach port (the Mach communication channel), signals are |
| reported to gdb as an exception. Furthermore we detect death of the |
| inferior through a Mach notification message. This way we only wait |
| on Mach ports. |
| |
| Some Mach documentation is available for Apple xnu source package or |
| from the web. */ |
| |
| |
| #define PTRACE(CMD, PID, ADDR, SIG) \ |
| darwin_ptrace(#CMD, CMD, (PID), (ADDR), (SIG)) |
| |
| extern boolean_t exc_server (mach_msg_header_t *in, mach_msg_header_t *out); |
| |
| static void darwin_stop (ptid_t); |
| |
| static void darwin_resume (ptid_t ptid, int step, |
| enum target_signal signal); |
| |
| static ptid_t darwin_wait (ptid_t ptid, struct target_waitstatus *status); |
| |
| static void darwin_mourn_inferior (struct target_ops *ops); |
| |
| static int darwin_lookup_task (char *args, task_t * ptask, int *ppid); |
| |
| static void darwin_kill_inferior (void); |
| |
| static void darwin_ptrace_me (void); |
| |
| static void darwin_ptrace_him (int pid); |
| |
| static void darwin_create_inferior (struct target_ops *ops, char *exec_file, |
| char *allargs, char **env, int from_tty); |
| |
| static void darwin_files_info (struct target_ops *ops); |
| |
| static char *darwin_pid_to_str (ptid_t tpid); |
| |
| static int darwin_thread_alive (ptid_t tpid); |
| |
| /* Current inferior. */ |
| darwin_inferior *darwin_inf = NULL; |
| |
| /* Target operations for Darwin. */ |
| static struct target_ops *darwin_ops; |
| |
| /* Task identifier of gdb. */ |
| static task_t gdb_task; |
| |
| /* A copy of mach_host_self (). */ |
| mach_port_t darwin_host_self; |
| |
| /* Exception port. */ |
| mach_port_t darwin_ex_port; |
| |
| /* Notification port. */ |
| mach_port_t darwin_not_port; |
| |
| /* Port set. */ |
| mach_port_t darwin_port_set; |
| |
| /* Page size. */ |
| static vm_size_t mach_page_size; |
| |
| /* If Set, catch all mach exceptions (before they are converted to signals |
| by the kernel). */ |
| static int enable_mach_exceptions; |
| |
| #define PAGE_TRUNC(x) ((x) & ~(mach_page_size - 1)) |
| #define PAGE_ROUND(x) PAGE_TRUNC((x) + mach_page_size - 1) |
| |
| /* Buffer containing received message and to be sent message. */ |
| static union |
| { |
| mach_msg_header_t hdr; |
| char data[1024]; |
| } msgin, msgout; |
| |
| /* Current message state. |
| If the kernel has sent a message it expects a reply and the inferior |
| can't be killed before. */ |
| static enum msg_state { NO_MESSAGE, GOT_MESSAGE, REPLY_SENT } msg_state; |
| |
| /* Unmarshalled received message. */ |
| static struct exc_msg |
| { |
| /* Receive port. */ |
| mach_port_t port; |
| |
| /* Thread and task taking the exception. */ |
| mach_port_t thread_port; |
| mach_port_t task_port; |
| |
| /* Type of the exception. */ |
| exception_type_t ex_type; |
| |
| /* Machine dependent details. */ |
| mach_msg_type_number_t data_count; |
| integer_t ex_data[4]; |
| } exc_msg; |
| |
| |
| /* This controls output of inferior debugging. |
| 1 = basic exception handling |
| 2 = task management |
| 3 = thread management |
| 4 = pending_event_handler |
| 6 = most chatty level. */ |
| |
| static int darwin_debug_flag = 0; |
| |
| static void |
| inferior_debug (int level, const char *fmt, ...) |
| { |
| va_list ap; |
| |
| if (darwin_debug_flag < level) |
| return; |
| |
| va_start (ap, fmt); |
| printf_unfiltered (_("[%d inferior]: "), getpid ()); |
| vprintf_unfiltered (fmt, ap); |
| va_end (ap); |
| } |
| |
| void |
| mach_check_error (kern_return_t ret, const char *file, |
| unsigned int line, const char *func) |
| { |
| if (ret == KERN_SUCCESS) |
| return; |
| if (func == NULL) |
| func = _("[UNKNOWN]"); |
| |
| error (_("error on line %u of \"%s\" in function \"%s\": %s (0x%lx)\n"), |
| line, file, func, mach_error_string (ret), (unsigned long) ret); |
| } |
| |
| static const char * |
| unparse_exception_type (unsigned int i) |
| { |
| static char unknown_exception_buf[32]; |
| |
| switch (i) |
| { |
| case EXC_BAD_ACCESS: |
| return "EXC_BAD_ACCESS"; |
| case EXC_BAD_INSTRUCTION: |
| return "EXC_BAD_INSTRUCTION"; |
| case EXC_ARITHMETIC: |
| return "EXC_ARITHMETIC"; |
| case EXC_EMULATION: |
| return "EXC_EMULATION"; |
| case EXC_SOFTWARE: |
| return "EXC_SOFTWARE"; |
| case EXC_BREAKPOINT: |
| return "EXC_BREAKPOINT"; |
| case EXC_SYSCALL: |
| return "EXC_SYSCALL"; |
| case EXC_MACH_SYSCALL: |
| return "EXC_MACH_SYSCALL"; |
| case EXC_RPC_ALERT: |
| return "EXC_RPC_ALERT"; |
| case EXC_CRASH: |
| return "EXC_CRASH"; |
| default: |
| snprintf (unknown_exception_buf, 32, _("unknown (%d)"), i); |
| return unknown_exception_buf; |
| } |
| } |
| |
| static int |
| darwin_ptrace (const char *name, |
| int request, int pid, PTRACE_TYPE_ARG3 arg3, int arg4) |
| { |
| int ret; |
| |
| ret = ptrace (request, pid, (caddr_t) arg3, arg4); |
| |
| inferior_debug (2, _("ptrace (%s, %d, 0x%x, %d): %d (%s)\n"), |
| name, pid, arg3, arg4, ret, |
| (ret != 0) ? strerror (errno) : _("no error")); |
| return ret; |
| } |
| |
| static int |
| cmp_thread_t (const void *l, const void *r) |
| { |
| thread_t lt = *(const thread_t *)l; |
| thread_t lr = *(const thread_t *)r; |
| return (int)(lr - lt); |
| } |
| |
| static void |
| darwin_check_new_threads (darwin_inferior *inf) |
| { |
| kern_return_t kret; |
| unsigned int i; |
| thread_array_t thread_list; |
| unsigned int new_nbr; |
| unsigned int old_nbr; |
| unsigned int new_ix, old_ix; |
| VEC (thread_t) *thread_vec; |
| |
| /* Get list of threads. */ |
| kret = task_threads (inf->task, &thread_list, &new_nbr); |
| MACH_CHECK_ERROR (kret); |
| if (kret != KERN_SUCCESS) |
| return; |
| |
| if (new_nbr > 1) |
| qsort (thread_list, new_nbr, sizeof (thread_t), cmp_thread_t); |
| |
| thread_vec = VEC_alloc (thread_t, new_nbr); |
| |
| if (inf->threads) |
| old_nbr = VEC_length (thread_t, inf->threads); |
| else |
| old_nbr = 0; |
| |
| for (new_ix = 0, old_ix = 0; new_ix < new_nbr || old_ix < old_nbr;) |
| { |
| thread_t new_id = (new_ix < new_nbr) ? |
| thread_list[new_ix] : THREAD_NULL; |
| thread_t old_id = (old_ix < old_nbr) ? |
| VEC_index (thread_t, inf->threads, old_ix) : THREAD_NULL; |
| |
| if (old_id == new_id) |
| { |
| /* Thread still exist. */ |
| VEC_safe_push (thread_t, thread_vec, old_id); |
| new_ix++; |
| old_ix++; |
| |
| kret = mach_port_deallocate (gdb_task, old_id); |
| MACH_CHECK_ERROR (kret); |
| continue; |
| } |
| if (new_id < old_id || old_ix == old_nbr) |
| { |
| /* A thread was created. */ |
| struct thread_info *tp; |
| |
| tp = add_thread (ptid_build (inf->pid, 0, new_id)); |
| VEC_safe_push (thread_t, thread_vec, new_id); |
| new_ix++; |
| continue; |
| } |
| if (new_id > old_id || new_ix == new_nbr) |
| { |
| /* A thread was removed. */ |
| delete_thread (ptid_build (inf->pid, 0, old_id)); |
| kret = mach_port_deallocate (gdb_task, old_id); |
| MACH_CHECK_ERROR (kret); |
| old_ix++; |
| } |
| } |
| |
| if (inf->threads) |
| VEC_free (thread_t, inf->threads); |
| inf->threads = thread_vec; |
| |
| kret = vm_deallocate (gdb_task, (vm_address_t) thread_list, |
| new_nbr * sizeof (int)); |
| MACH_CHECK_ERROR (kret); |
| } |
| |
| static void |
| darwin_stop (ptid_t t) |
| { |
| int ret; |
| |
| ret = kill (ptid_get_pid (inferior_ptid), SIGINT); |
| } |
| |
| static void |
| darwin_resume (ptid_t ptid, int step, enum target_signal signal) |
| { |
| struct target_waitstatus status; |
| int pid; |
| thread_t thread; |
| kern_return_t kret; |
| int res; |
| |
| /* minus_one_ptid is RESUME_ALL. */ |
| if (ptid_equal (ptid, minus_one_ptid)) |
| ptid = inferior_ptid; |
| |
| pid = ptid_get_pid (ptid); |
| thread = ptid_get_tid (ptid); |
| |
| inferior_debug |
| (2, _("darwin_resume: state=%d, thread=0x%x, step=%d signal=%d\n"), |
| msg_state, thread, step, signal); |
| |
| switch (msg_state) |
| { |
| case GOT_MESSAGE: |
| switch (exc_msg.ex_type) |
| { |
| case EXC_SOFTWARE: |
| if (exc_msg.ex_data[0] == EXC_SOFT_SIGNAL) |
| { |
| int nsignal = target_signal_to_host (signal); |
| res = PTRACE (PT_THUPDATE, pid, |
| (void *)exc_msg.thread_port, nsignal); |
| if (res < 0) |
| printf_unfiltered (_("ptrace THUP: res=%d\n"), res); |
| } |
| break; |
| |
| default: |
| break; |
| } |
| |
| if (thread != 0) |
| { |
| inferior_debug (2, _("darwin_set_sstep (thread=%x, enable=%d)\n"), |
| thread, step); |
| darwin_set_sstep (thread, step); |
| } |
| |
| kret = mach_msg (&msgout.hdr, MACH_SEND_MSG | MACH_SEND_INTERRUPT, |
| msgout.hdr.msgh_size, 0, |
| MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE, |
| MACH_PORT_NULL); |
| if (kret != 0) |
| printf_unfiltered (_("mach_msg (reply) ret=%d\n"), kret); |
| |
| msg_state = REPLY_SENT; |
| break; |
| |
| case NO_MESSAGE: |
| if (step) |
| res = PTRACE (PT_STEP, pid, (caddr_t)1, 0); |
| else |
| res = PTRACE (PT_CONTINUE, pid, (caddr_t)1, 0); |
| break; |
| |
| default: |
| gdb_assert (0); |
| } |
| } |
| |
| kern_return_t |
| catch_exception_raise_state |
| (mach_port_t port, |
| exception_type_t exception_type, mach_exception_data_t exception_data, |
| mach_msg_type_number_t data_count, thread_state_flavor_t * state_flavor, |
| thread_state_t in_state, mach_msg_type_number_t in_state_count, |
| thread_state_t out_state, mach_msg_type_number_t out_state_count) |
| { |
| return KERN_FAILURE; |
| } |
| |
| kern_return_t |
| catch_exception_raise_state_identity |
| (mach_port_t port, mach_port_t thread_port, mach_port_t task_port, |
| exception_type_t exception_type, mach_exception_data_t exception_data, |
| mach_msg_type_number_t data_count, thread_state_flavor_t * state_flavor, |
| thread_state_t in_state, mach_msg_type_number_t in_state_count, |
| thread_state_t out_state, mach_msg_type_number_t out_state_count) |
| { |
| kern_return_t kret; |
| |
| kret = mach_port_deallocate (mach_task_self (), task_port); |
| MACH_CHECK_ERROR (kret); |
| kret = mach_port_deallocate (mach_task_self (), thread_port); |
| MACH_CHECK_ERROR (kret); |
| |
| return KERN_FAILURE; |
| } |
| |
| kern_return_t |
| catch_exception_raise (mach_port_t port, |
| mach_port_t thread_port, |
| mach_port_t task_port, |
| exception_type_t exception_type, |
| exception_data_t exception_data, |
| mach_msg_type_number_t data_count) |
| { |
| kern_return_t kret; |
| int i; |
| int res; |
| |
| /* We got new rights to the task. Get rid of it. */ |
| kret = mach_port_deallocate (mach_task_self (), task_port); |
| MACH_CHECK_ERROR (kret); |
| |
| inferior_debug |
| (7, _("catch_exception_raise: exception_type=%d, data_count=%d\n"), |
| exception_type, data_count); |
| if (darwin_debug_flag > 7) |
| { |
| for (i = 0; i < data_count; i++) |
| printf_unfiltered (" %08x", exception_data[i]); |
| printf_unfiltered ("\n"); |
| } |
| |
| /* Save the message. |
| FIXME: this should be in a per-thread variable. */ |
| exc_msg.port = port; |
| exc_msg.thread_port = thread_port; |
| exc_msg.task_port = task_port; |
| exc_msg.ex_type = exception_type; |
| exc_msg.data_count = data_count; |
| for (i = 0; i < data_count && i < 4; i++) |
| exc_msg.ex_data[i] = exception_data[i]; |
| |
| return KERN_SUCCESS; |
| } |
| |
| static ptid_t |
| darwin_wait (ptid_t ptid, struct target_waitstatus *status) |
| { |
| kern_return_t kret; |
| mach_msg_header_t *hdr = &msgin.hdr; |
| pid_t pid = ptid_get_pid (inferior_ptid); /* FIXME. */ |
| |
| gdb_assert (msg_state != GOT_MESSAGE); |
| |
| inferior_debug (6, _("darwin_wait: waiting for a message\n")); |
| |
| /* Wait for a message. */ |
| kret = mach_msg (&msgin.hdr, MACH_RCV_MSG | MACH_RCV_INTERRUPT, 0, |
| sizeof (msgin.data), darwin_port_set, 0, MACH_PORT_NULL); |
| |
| if (kret == MACH_RCV_INTERRUPTED) |
| { |
| status->kind = TARGET_WAITKIND_IGNORE; |
| return minus_one_ptid; |
| } |
| |
| if (kret != MACH_MSG_SUCCESS) |
| { |
| inferior_debug (1, _("mach_msg: ret=%x\n"), kret); |
| status->kind = TARGET_WAITKIND_SPURIOUS; |
| return minus_one_ptid; |
| } |
| |
| /* Debug: display message. */ |
| if (darwin_debug_flag > 10) |
| { |
| const unsigned long *buf = (unsigned long *) hdr; |
| unsigned int i; |
| |
| printf_unfiltered (_(" bits: 0x%x"), hdr->msgh_bits); |
| printf_unfiltered (_(", size: 0x%x"), hdr->msgh_size); |
| printf_unfiltered (_(", remote-port: 0x%x"), hdr->msgh_remote_port); |
| printf_unfiltered (_(", local-port: 0x%x"), hdr->msgh_local_port); |
| printf_unfiltered (_(", reserved: 0x%x"), hdr->msgh_reserved); |
| printf_unfiltered (_(", id: 0x%x\n"), hdr->msgh_id); |
| |
| if (darwin_debug_flag > 11) |
| { |
| printf_unfiltered (_(" data:")); |
| for (i = 0; i < hdr->msgh_size; i++) |
| printf_unfiltered (" %08lx", buf[i]); |
| printf_unfiltered (_("\n")); |
| } |
| } |
| |
| /* Exception message. */ |
| if (hdr->msgh_local_port == darwin_ex_port) |
| { |
| /* Handle it via the exception server. */ |
| if (!exc_server (&msgin.hdr, &msgout.hdr)) |
| { |
| printf_unfiltered (_("exc_server: unknown message (id=%x)\n"), |
| hdr->msgh_id); |
| status->kind = TARGET_WAITKIND_SPURIOUS; |
| return minus_one_ptid; |
| } |
| |
| status->kind = TARGET_WAITKIND_STOPPED; |
| |
| inferior_debug (2, _("darwin_wait: thread=%x, got %s\n"), |
| exc_msg.thread_port, |
| unparse_exception_type (exc_msg.ex_type)); |
| |
| switch (exc_msg.ex_type) |
| { |
| case EXC_BAD_ACCESS: |
| status->value.sig = TARGET_EXC_BAD_ACCESS; |
| break; |
| case EXC_BAD_INSTRUCTION: |
| status->value.sig = TARGET_EXC_BAD_INSTRUCTION; |
| break; |
| case EXC_ARITHMETIC: |
| status->value.sig = TARGET_EXC_ARITHMETIC; |
| break; |
| case EXC_EMULATION: |
| status->value.sig = TARGET_EXC_EMULATION; |
| break; |
| case EXC_SOFTWARE: |
| if (exc_msg.ex_data[0] == EXC_SOFT_SIGNAL) |
| { |
| status->value.sig = target_signal_from_host (exc_msg.ex_data[1]); |
| inferior_debug (2, _(" (signal %d: %s)\n"), |
| exc_msg.ex_data[1], |
| target_signal_to_name (status->value.sig)); |
| } |
| else |
| status->value.sig = TARGET_EXC_SOFTWARE; |
| break; |
| case EXC_BREAKPOINT: |
| /* Many internal GDB routines expect breakpoints to be reported |
| as TARGET_SIGNAL_TRAP, and will report TARGET_EXC_BREAKPOINT |
| as a spurious signal. */ |
| status->value.sig = TARGET_SIGNAL_TRAP; |
| break; |
| default: |
| status->value.sig = TARGET_SIGNAL_UNKNOWN; |
| break; |
| } |
| |
| msg_state = GOT_MESSAGE; |
| |
| return ptid_build (pid, 0, exc_msg.thread_port); |
| } |
| else if (hdr->msgh_local_port == darwin_not_port) |
| { |
| pid_t res; |
| int wstatus; |
| |
| /* FIXME: translate task port to pid. */ |
| res = wait4 (pid, &wstatus, 0, NULL); |
| if (res != pid) |
| { |
| printf_unfiltered (_("wait4: res=%x\n"), res); |
| wstatus = 0; |
| } |
| status->kind = TARGET_WAITKIND_EXITED; |
| status->value.integer = WEXITSTATUS (wstatus); |
| |
| inferior_debug (2, _("darwin_wait: pid=%d exit, status=%x\n"), |
| pid, wstatus); |
| |
| msg_state = NO_MESSAGE; |
| |
| return ptid; |
| } |
| else |
| { |
| printf_unfiltered (_("Bad local-port: %x\n"), hdr->msgh_local_port); |
| status->kind = TARGET_WAITKIND_SPURIOUS; |
| return minus_one_ptid; |
| } |
| } |
| |
| static void |
| darwin_mourn_inferior (struct target_ops *ops) |
| { |
| struct inferior *inf = current_inferior (); |
| kern_return_t kret; |
| mach_port_t prev; |
| int i; |
| |
| unpush_target (darwin_ops); |
| |
| /* Deallocate threads. */ |
| if (darwin_inf->threads) |
| { |
| int k; |
| thread_t t; |
| for (k = 0; VEC_iterate (thread_t, darwin_inf->threads, k, t); k++) |
| { |
| kret = mach_port_deallocate (gdb_task, t); |
| MACH_CHECK_ERROR (kret); |
| } |
| VEC_free (thread_t, darwin_inf->threads); |
| darwin_inf->threads = NULL; |
| } |
| |
| kret = mach_port_request_notification (gdb_task, darwin_inf->task, |
| MACH_NOTIFY_DEAD_NAME, 0, |
| darwin_inf->prev_not_port, |
| MACH_MSG_TYPE_MAKE_SEND_ONCE, |
| &prev); |
| /* This can fail if the task is dead. */ |
| if (kret == KERN_SUCCESS) |
| { |
| kret = mach_port_deallocate (gdb_task, prev); |
| MACH_CHECK_ERROR (kret); |
| } |
| |
| /* Deallocate saved exception ports. */ |
| for (i = 0; i < darwin_inf->exception_info.count; i++) |
| { |
| kret = mach_port_deallocate |
| (gdb_task, darwin_inf->exception_info.ports[i]); |
| MACH_CHECK_ERROR (kret); |
| } |
| darwin_inf->exception_info.count = 0; |
| |
| kret = mach_port_deallocate (gdb_task, darwin_inf->task); |
| MACH_CHECK_ERROR (kret); |
| |
| darwin_inf->task = 0; |
| darwin_inf->pid = 0; |
| |
| generic_mourn_inferior (); |
| } |
| |
| static void |
| darwin_stop_inferior (darwin_inferior *inf) |
| { |
| struct target_waitstatus wstatus; |
| ptid_t ptid; |
| kern_return_t kret; |
| int status; |
| int res; |
| |
| gdb_assert (inf != NULL); |
| |
| kret = task_suspend (inf->task); |
| MACH_CHECK_ERROR (kret); |
| |
| if (msg_state == GOT_MESSAGE) |
| darwin_resume (inferior_ptid, 0, 0); |
| |
| res = kill (inf->pid, SIGSTOP); |
| if (res != 0) |
| warning (_("cannot kill: %s\n"), strerror (errno)); |
| |
| ptid = darwin_wait (inferior_ptid, &wstatus); |
| gdb_assert (wstatus.kind = TARGET_WAITKIND_STOPPED); |
| } |
| |
| static void |
| darwin_kill_inferior (void) |
| { |
| struct target_waitstatus wstatus; |
| ptid_t ptid; |
| kern_return_t kret; |
| int status; |
| int res; |
| |
| gdb_assert (darwin_inf != NULL); |
| |
| if (ptid_equal (inferior_ptid, null_ptid)) |
| return; |
| |
| darwin_stop_inferior (darwin_inf); |
| |
| res = PTRACE (PT_KILL, darwin_inf->pid, 0, 0); |
| gdb_assert (res == 0); |
| |
| if (msg_state == GOT_MESSAGE) |
| { |
| exc_msg.ex_type = 0; |
| darwin_resume (inferior_ptid, 0, 0); |
| } |
| |
| kret = task_resume (darwin_inf->task); |
| MACH_CHECK_ERROR (kret); |
| |
| ptid = darwin_wait (inferior_ptid, &wstatus); |
| |
| /* This double wait seems required... */ |
| res = waitpid (darwin_inf->pid, &status, 0); |
| gdb_assert (res == darwin_inf->pid); |
| |
| msg_state = NO_MESSAGE; |
| |
| target_mourn_inferior (); |
| } |
| |
| /* The child must synchronize with gdb: gdb must set the exception port |
| before the child call PTRACE_SIGEXC. We use a pipe to achieve this. |
| FIXME: is there a lighter way ? */ |
| static int ptrace_fds[2]; |
| |
| static void |
| darwin_ptrace_me (void) |
| { |
| int res; |
| char c; |
| |
| /* Close write end point. */ |
| close (ptrace_fds[1]); |
| |
| /* Wait until gdb is ready. */ |
| res = read (ptrace_fds[0], &c, 1); |
| gdb_assert (res == 0); |
| close (ptrace_fds[0]); |
| |
| /* Get rid of privileges. */ |
| setegid (getgid ()); |
| |
| /* Set TRACEME. */ |
| PTRACE (PT_TRACE_ME, 0, 0, 0); |
| |
| /* Redirect signals to exception port. */ |
| PTRACE (PT_SIGEXC, 0, 0, 0); |
| } |
| |
| /* Dummy function to be sure fork_inferior uses fork(2) and not vfork(2). */ |
| static void |
| darwin_pre_ptrace (void) |
| { |
| if (pipe (ptrace_fds) != 0) |
| { |
| ptrace_fds[0] = -1; |
| ptrace_fds[1] = -1; |
| error (_("unable to create a pipe: %s"), safe_strerror (errno)); |
| } |
| } |
| |
| static kern_return_t |
| darwin_save_exception_ports (darwin_inferior *inf) |
| { |
| kern_return_t kret; |
| |
| inf->exception_info.count = |
| sizeof (inf->exception_info.ports) / sizeof (inf->exception_info.ports[0]); |
| |
| kret = task_get_exception_ports |
| (inf->task, EXC_MASK_ALL, inf->exception_info.masks, |
| &inf->exception_info.count, inf->exception_info.ports, |
| inf->exception_info.behaviors, inf->exception_info.flavors); |
| return kret; |
| } |
| |
| static kern_return_t |
| darwin_restore_exception_ports (darwin_inferior *inf) |
| { |
| int i; |
| kern_return_t kret; |
| |
| for (i = 0; i < inf->exception_info.count; i++) |
| { |
| kret = task_set_exception_ports |
| (inf->task, inf->exception_info.masks[i], inf->exception_info.ports[i], |
| inf->exception_info.behaviors[i], inf->exception_info.flavors[i]); |
| if (kret != KERN_SUCCESS) |
| return kret; |
| } |
| |
| return KERN_SUCCESS; |
| } |
| |
| static void |
| darwin_attach_pid (int pid) |
| { |
| task_t itask; |
| kern_return_t kret; |
| mach_port_t prev_port; |
| int traps_expected; |
| exception_mask_t mask; |
| |
| kret = task_for_pid (gdb_task, pid, &itask); |
| if (kret != KERN_SUCCESS) |
| { |
| int status; |
| struct inferior *inf = current_inferior (); |
| |
| if (!inf->attach_flag) |
| { |
| kill (pid, 9); |
| waitpid (pid, &status, 0); |
| } |
| |
| error (_("Unable to find Mach task port for process-id %d: %s (0x%lx).\n" |
| " (please check gdb is setgid procmod)"), |
| pid, mach_error_string (kret), (unsigned long) kret); |
| } |
| |
| inferior_debug (2, _("inferior task: 0x%08x, pid: %d\n"), itask, pid); |
| |
| if (darwin_ex_port == MACH_PORT_NULL) |
| { |
| /* Create a port to get exceptions. */ |
| kret = mach_port_allocate (gdb_task, MACH_PORT_RIGHT_RECEIVE, |
| &darwin_ex_port); |
| gdb_assert (kret == KERN_SUCCESS); |
| |
| kret = mach_port_insert_right (gdb_task, darwin_ex_port, darwin_ex_port, |
| MACH_MSG_TYPE_MAKE_SEND); |
| gdb_assert (kret == KERN_SUCCESS); |
| |
| /* Create a port set and put ex_port in it. */ |
| kret = mach_port_allocate (gdb_task, MACH_PORT_RIGHT_PORT_SET, |
| &darwin_port_set); |
| gdb_assert (kret == KERN_SUCCESS); |
| |
| kret = mach_port_move_member (gdb_task, darwin_ex_port, darwin_port_set); |
| gdb_assert (kret == KERN_SUCCESS); |
| |
| /* Create a port to be notified when the child task terminates. */ |
| kret = mach_port_allocate (gdb_task, MACH_PORT_RIGHT_RECEIVE, |
| &darwin_not_port); |
| gdb_assert (kret == KERN_SUCCESS); |
| |
| kret = mach_port_insert_right (gdb_task, darwin_not_port, darwin_not_port, |
| MACH_MSG_TYPE_MAKE_SEND); |
| gdb_assert (kret == KERN_SUCCESS); |
| |
| kret = mach_port_move_member (gdb_task, darwin_not_port, darwin_port_set); |
| gdb_assert (kret == KERN_SUCCESS); |
| } |
| |
| kret = mach_port_request_notification (gdb_task, itask, |
| MACH_NOTIFY_DEAD_NAME, 0, |
| darwin_not_port, |
| MACH_MSG_TYPE_MAKE_SEND_ONCE, |
| &darwin_inf->prev_not_port); |
| gdb_assert (kret == KERN_SUCCESS); |
| |
| darwin_inf->task = itask; |
| darwin_inf->pid = pid; |
| |
| kret = darwin_save_exception_ports (darwin_inf); |
| gdb_assert (kret == KERN_SUCCESS); |
| |
| /* Set exception port. */ |
| if (enable_mach_exceptions) |
| mask = EXC_MASK_ALL; |
| else |
| mask = EXC_MASK_SOFTWARE; |
| kret = task_set_exception_ports |
| (itask, mask, darwin_ex_port, EXCEPTION_DEFAULT, THREAD_STATE_NONE); |
| gdb_assert (kret == KERN_SUCCESS); |
| |
| push_target (darwin_ops); |
| } |
| |
| static void |
| darwin_init_thread_list (darwin_inferior *inf) |
| { |
| thread_t thread; |
| |
| darwin_check_new_threads (inf); |
| |
| gdb_assert (inf->threads && VEC_length (thread_t, inf->threads) > 0); |
| thread = VEC_index (thread_t, inf->threads, 0); |
| inferior_ptid = ptid_build (inf->pid, 0, thread); |
| } |
| |
| static void |
| darwin_ptrace_him (int pid) |
| { |
| task_t itask; |
| kern_return_t kret; |
| mach_port_t prev_port; |
| int traps_expected; |
| |
| darwin_attach_pid (pid); |
| |
| /* Let's the child run. */ |
| close (ptrace_fds[0]); |
| close (ptrace_fds[1]); |
| |
| /* fork_inferior automatically add a thread - but it uses a wrong tid. */ |
| delete_thread_silent (inferior_ptid); |
| darwin_init_thread_list (darwin_inf); |
| |
| startup_inferior (START_INFERIOR_TRAPS_EXPECTED); |
| } |
| |
| static void |
| darwin_create_inferior (struct target_ops *ops, char *exec_file, |
| char *allargs, char **env, int from_tty) |
| { |
| /* Do the hard work. */ |
| fork_inferior (exec_file, allargs, env, darwin_ptrace_me, darwin_ptrace_him, |
| darwin_pre_ptrace, NULL); |
| |
| /* Return now in case of error. */ |
| if (ptid_equal (inferior_ptid, null_ptid)) |
| return; |
| } |
| |
| |
| /* Attach to process PID, then initialize for debugging it |
| and wait for the trace-trap that results from attaching. */ |
| static void |
| darwin_attach (struct target_ops *ops, char *args, int from_tty) |
| { |
| pid_t pid; |
| pid_t pid2; |
| int wstatus; |
| int res; |
| struct inferior *inf; |
| |
| gdb_assert (msg_state == NO_MESSAGE); |
| |
| if (!args) |
| error_no_arg (_("process-id to attach")); |
| |
| pid = atoi (args); |
| |
| if (pid == getpid ()) /* Trying to masturbate? */ |
| error (_("I refuse to debug myself!")); |
| |
| if (from_tty) |
| printf_unfiltered (_("Attaching to pid %d\n"), pid); |
| |
| res = PTRACE (PT_ATTACHEXC, pid, 0, 0); |
| if (res != 0) |
| error (_("Unable to attach to process-id %d: %s (%d)"), |
| pid, strerror (errno), errno); |
| |
| inf = add_inferior (pid); |
| inf->attach_flag = 1; |
| |
| darwin_attach_pid (pid); |
| |
| pid2 = wait4 (pid, &wstatus, WUNTRACED, NULL); |
| gdb_assert (pid2 == pid); |
| inferior_debug (1, _("darwin_attach: wait4 pid=%d, status=0x%x\n"), |
| pid2, wstatus); |
| |
| |
| darwin_init_thread_list (darwin_inf); |
| |
| darwin_check_osabi (darwin_inf, ptid_get_tid (inferior_ptid)); |
| |
| /* Looks strange, but the kernel doesn't stop the process... |
| (Bug in Leopard ?) |
| Do it manually. */ |
| /* FIXME: doesn't look to work with multi-threads!! */ |
| kill (pid, SIGSTOP); |
| } |
| |
| /* Take a program previously attached to and detaches it. |
| The program resumes execution and will no longer stop |
| on signals, etc. We'd better not have left any breakpoints |
| in the program or it'll die when it hits one. For this |
| to work, it may be necessary for the process to have been |
| previously attached. It *might* work if the program was |
| started via fork. */ |
| static void |
| darwin_detach (struct target_ops *ops, char *args, int from_tty) |
| { |
| kern_return_t kret; |
| int res; |
| |
| if (from_tty) |
| { |
| char *exec_file = get_exec_file (0); |
| if (exec_file == 0) |
| exec_file = ""; |
| printf_unfiltered (_("Detaching from program: %s, %d\n"), exec_file, |
| ptid_get_pid (inferior_ptid)); |
| gdb_flush (gdb_stdout); |
| } |
| |
| darwin_stop_inferior (darwin_inf); |
| |
| kret = darwin_restore_exception_ports (darwin_inf); |
| MACH_CHECK_ERROR (kret); |
| |
| if (msg_state == GOT_MESSAGE) |
| { |
| exc_msg.ex_type = 0; |
| darwin_resume (inferior_ptid, 0, 0); |
| } |
| |
| kret = task_resume (darwin_inf->task); |
| gdb_assert (kret == KERN_SUCCESS); |
| |
| res = PTRACE (PT_DETACH, darwin_inf->pid, 0, 0); |
| if (res != 0) |
| printf_unfiltered (_("Unable to detach from process-id %d: %s (%d)"), |
| darwin_inf->pid, strerror (errno), errno); |
| |
| msg_state = NO_MESSAGE; |
| |
| darwin_mourn_inferior (ops); |
| } |
| |
| static void |
| darwin_files_info (struct target_ops *ops) |
| { |
| gdb_assert (darwin_inf != NULL); |
| } |
| |
| static char * |
| darwin_pid_to_str (ptid_t ptid) |
| { |
| static char buf[128]; |
| |
| snprintf (buf, sizeof (buf), |
| _("process %d gdb-thread 0x%lx"), |
| (unsigned) ptid_get_pid (ptid), |
| (unsigned long) ptid_get_tid (ptid)); |
| return buf; |
| } |
| |
| static int |
| darwin_thread_alive (ptid_t ptid) |
| { |
| return 1; |
| } |
| |
| /* If RDADDR is not NULL, read inferior task's LEN bytes from ADDR and |
| copy it to RDADDR in gdb's address space. |
| If WRADDR is not NULL, write gdb's LEN bytes from WRADDR and copy it |
| to ADDR in inferior task's address space. |
| Return 0 on failure; number of bytes read / writen otherwise. */ |
| static int |
| darwin_read_write_inferior (task_t task, CORE_ADDR addr, |
| char *rdaddr, const char *wraddr, int length) |
| { |
| kern_return_t err; |
| mach_vm_address_t offset = addr & (mach_page_size - 1); |
| mach_vm_address_t low_address = (mach_vm_address_t) (addr - offset); |
| mach_vm_size_t aligned_length = (mach_vm_size_t) PAGE_ROUND (offset + length); |
| pointer_t copied; |
| int copy_count; |
| mach_vm_size_t remaining_length; |
| mach_vm_address_t region_address; |
| mach_vm_size_t region_length; |
| |
| inferior_debug (8, _("darwin_read_write_inferior(%s, len=%d)\n"), |
| core_addr_to_string (addr), length); |
| |
| /* Get memory from inferior with page aligned addresses */ |
| err = mach_vm_read (task, low_address, aligned_length, |
| &copied, ©_count); |
| if (err != KERN_SUCCESS) |
| { |
| warning (_("darwin_read_write_inferior: vm_read failed: %s"), |
| mach_error_string (err)); |
| return 0; |
| } |
| |
| if (rdaddr != NULL) |
| memcpy (rdaddr, (char *)copied + offset, length); |
| |
| if (wraddr == NULL) |
| goto out; |
| |
| memcpy ((char *)copied + offset, wraddr, length); |
| |
| /* Do writes atomically. |
| First check for holes and unwritable memory. */ |
| for (region_address = low_address, remaining_length = aligned_length; |
| region_address < low_address + aligned_length; |
| region_address += region_length, remaining_length -= region_length) |
| { |
| vm_region_basic_info_data_64_t info; |
| mach_port_t object_name; |
| mach_vm_address_t old_address = region_address; |
| mach_msg_type_number_t count; |
| |
| region_length = remaining_length; |
| count = VM_REGION_BASIC_INFO_COUNT_64; |
| err = mach_vm_region (task, ®ion_address, ®ion_length, |
| VM_REGION_BASIC_INFO_64, |
| (vm_region_info_t) &info, &count, &object_name); |
| |
| if (err != KERN_SUCCESS) |
| { |
| warning (_("darwin_write_inferior: mach_vm_region failed: %s"), |
| mach_error_string (err)); |
| goto out; |
| } |
| |
| /* Check for holes in memory */ |
| if (region_address > old_address) |
| { |
| warning (_("No memory at %s (vs %s+0x%x). Nothing written"), |
| core_addr_to_string (old_address), |
| core_addr_to_string (region_address), |
| (unsigned)region_length); |
| length = 0; |
| goto out; |
| } |
| |
| if (!(info.max_protection & VM_PROT_WRITE)) |
| { |
| warning (_("Memory at address %s is unwritable. Nothing written"), |
| core_addr_to_string (old_address)); |
| length = 0; |
| goto out; |
| } |
| |
| if (!(info.protection & VM_PROT_WRITE)) |
| { |
| err = mach_vm_protect (task, old_address, region_length, |
| FALSE, info.protection | VM_PROT_WRITE); |
| if (err != KERN_SUCCESS) |
| { |
| warning |
| (_("darwin_read_write_inferior: mach_vm_protect failed: %s"), |
| mach_error_string (err)); |
| length = 0; |
| goto out; |
| } |
| } |
| } |
| |
| err = mach_vm_write (task, low_address, copied, aligned_length); |
| |
| if (err != KERN_SUCCESS) |
| { |
| warning (_("darwin_read_write_inferior: mach_vm_write failed: %s"), |
| mach_error_string (err)); |
| length = 0; |
| } |
| out: |
| mach_vm_deallocate (mach_task_self (), copied, copy_count); |
| return length; |
| } |
| |
| |
| /* Return 0 on failure, number of bytes handled otherwise. TARGET |
| is ignored. */ |
| static int |
| darwin_xfer_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len, int write, |
| struct mem_attrib *attrib, struct target_ops *target) |
| { |
| task_t task = darwin_inf->task; |
| |
| if (task == MACH_PORT_NULL) |
| return 0; |
| |
| inferior_debug (8, _("darwin_xfer_memory(%s, %d, %c)\n"), |
| core_addr_to_string (memaddr), len, write ? 'w' : 'r'); |
| |
| if (write) |
| return darwin_read_write_inferior (task, memaddr, NULL, myaddr, len); |
| else |
| return darwin_read_write_inferior (task, memaddr, myaddr, NULL, len); |
| } |
| |
| static LONGEST |
| darwin_xfer_partial (struct target_ops *ops, |
| enum target_object object, const char *annex, |
| gdb_byte *readbuf, const gdb_byte *writebuf, |
| ULONGEST offset, LONGEST len) |
| { |
| inferior_debug (8, _("darwin_xfer_partial(%s, %d, rbuf=%p, wbuf=%p)\n"), |
| core_addr_to_string (offset), (int)len, readbuf, writebuf); |
| |
| if (object != TARGET_OBJECT_MEMORY) |
| return -1; |
| |
| return darwin_read_write_inferior (darwin_inf->task, offset, |
| readbuf, writebuf, len); |
| } |
| |
| static void |
| set_enable_mach_exceptions (char *args, int from_tty, |
| struct cmd_list_element *c) |
| { |
| if (darwin_inf && darwin_inf->task != TASK_NULL) |
| { |
| exception_mask_t mask; |
| kern_return_t kret; |
| |
| if (enable_mach_exceptions) |
| mask = EXC_MASK_ALL; |
| else |
| { |
| darwin_restore_exception_ports (darwin_inf); |
| mask = EXC_MASK_SOFTWARE; |
| } |
| kret = task_set_exception_ports (darwin_inf->task, mask, darwin_ex_port, |
| EXCEPTION_DEFAULT, THREAD_STATE_NONE); |
| MACH_CHECK_ERROR (kret); |
| } |
| } |
| |
| void |
| _initialize_darwin_inferior () |
| { |
| kern_return_t kret; |
| |
| gdb_assert (darwin_inf == NULL); |
| |
| gdb_task = mach_task_self (); |
| darwin_host_self = mach_host_self (); |
| |
| /* Read page size. */ |
| kret = host_page_size (darwin_host_self, &mach_page_size); |
| if (kret != KERN_SUCCESS) |
| { |
| mach_page_size = 0x1000; |
| MACH_CHECK_ERROR (kret); |
| } |
| |
| darwin_inf = (struct darwin_inferior *) |
| xmalloc (sizeof (struct darwin_inferior)); |
| |
| memset (darwin_inf, 0, sizeof (*darwin_inf)); |
| |
| darwin_ops = inf_child_target (); |
| |
| darwin_ops->to_shortname = "darwin-child"; |
| darwin_ops->to_longname = _("Darwin child process"); |
| darwin_ops->to_doc = |
| _("Darwin child process (started by the \"run\" command)."); |
| darwin_ops->to_create_inferior = darwin_create_inferior; |
| darwin_ops->to_attach = darwin_attach; |
| darwin_ops->to_attach_no_wait = 0; |
| darwin_ops->to_detach = darwin_detach; |
| darwin_ops->to_files_info = darwin_files_info; |
| darwin_ops->to_wait = darwin_wait; |
| darwin_ops->to_mourn_inferior = darwin_mourn_inferior; |
| darwin_ops->to_kill = darwin_kill_inferior; |
| darwin_ops->to_stop = darwin_stop; |
| darwin_ops->to_resume = darwin_resume; |
| darwin_ops->to_thread_alive = darwin_thread_alive; |
| darwin_ops->to_pid_to_str = darwin_pid_to_str; |
| darwin_ops->to_load = NULL; |
| darwin_ops->deprecated_xfer_memory = darwin_xfer_memory; |
| darwin_ops->to_xfer_partial = darwin_xfer_partial; |
| darwin_ops->to_has_thread_control = tc_schedlock /*| tc_switch */; |
| |
| darwin_complete_target (darwin_ops); |
| |
| add_target (darwin_ops); |
| |
| inferior_debug (2, _("GDB task: 0x%lx, pid: %d\n"), mach_task_self (), |
| getpid ()); |
| |
| add_setshow_zinteger_cmd ("darwin", class_obscure, |
| &darwin_debug_flag, _("\ |
| Set if printing inferior communication debugging statements."), _("\ |
| Show if printing inferior communication debugging statements."), NULL, |
| NULL, NULL, |
| &setdebuglist, &showdebuglist); |
| |
| add_setshow_boolean_cmd ("mach-exceptions", class_support, |
| &enable_mach_exceptions, _("\ |
| Set if mach exceptions are caught."), _("\ |
| Show if mach exceptions are caught."), _("\ |
| When this mode is on, all low level exceptions are reported before being\n\ |
| reported by the kernel."), |
| &set_enable_mach_exceptions, NULL, |
| &setlist, &showlist); |
| } |