| /* Native debugging support for Intel x86 running DJGPP. |
| Copyright 1997, 1999 Free Software Foundation, Inc. |
| Written by Robert Hoehne. |
| |
| 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 <fcntl.h> |
| |
| #include "defs.h" |
| #include "frame.h" /* required by inferior.h */ |
| #include "inferior.h" |
| #include "target.h" |
| #include "wait.h" |
| #include "gdbcore.h" |
| #include "command.h" |
| #include "floatformat.h" |
| |
| #include <stdio.h> /* required for __DJGPP_MINOR__ */ |
| #include <stdlib.h> |
| #include <string.h> |
| #include <errno.h> |
| #include <unistd.h> |
| #include <io.h> |
| #include <dpmi.h> |
| #include <debug/v2load.h> |
| #include <debug/dbgcom.h> |
| #if __DJGPP_MINOR__ > 2 |
| #include <debug/redir.h> |
| #endif |
| |
| #if __DJGPP_MINOR__ < 3 |
| /* This code will be provided from DJGPP 2.03 on. Until then I code it |
| here */ |
| typedef struct |
| { |
| unsigned short sig0; |
| unsigned short sig1; |
| unsigned short sig2; |
| unsigned short sig3; |
| unsigned short exponent:15; |
| unsigned short sign:1; |
| } |
| NPXREG; |
| |
| typedef struct |
| { |
| unsigned int control; |
| unsigned int status; |
| unsigned int tag; |
| unsigned int eip; |
| unsigned int cs; |
| unsigned int dataptr; |
| unsigned int datasel; |
| NPXREG reg[8]; |
| } |
| NPX; |
| |
| static NPX npx; |
| |
| static void save_npx (void); /* Save the FPU of the debugged program */ |
| static void load_npx (void); /* Restore the FPU of the debugged program */ |
| |
| /* ------------------------------------------------------------------------- */ |
| /* Store the contents of the NPX in the global variable `npx'. */ |
| /* *INDENT-OFF* */ |
| |
| static void |
| save_npx (void) |
| { |
| asm ("inb $0xa0, %%al |
| testb $0x20, %%al |
| jz 1f |
| xorb %% al, %%al |
| outb %% al, $0xf0 |
| movb $0x20, %%al |
| outb %% al, $0xa0 |
| outb %% al, $0x20 |
| 1: |
| fnsave % 0 |
| fwait " |
| : "=m" (npx) |
| : /* No input */ |
| : "%eax"); |
| } |
| |
| /* *INDENT-ON* */ |
| |
| |
| |
| |
| |
| /* ------------------------------------------------------------------------- */ |
| /* Reload the contents of the NPX from the global variable `npx'. */ |
| |
| static void |
| load_npx (void) |
| { |
| asm ("frstor %0":"=m" (npx)); |
| } |
| /* ------------------------------------------------------------------------- */ |
| /* Stubs for the missing redirection functions. */ |
| typedef struct { |
| char *command; |
| int redirected; |
| } cmdline_t; |
| |
| void redir_cmdline_delete (cmdline_t *ptr) {ptr->redirected = 0;} |
| int redir_cmdline_parse (const char *args, cmdline_t *ptr) |
| { |
| return -1; |
| } |
| int redir_to_child (cmdline_t *ptr) |
| { |
| return 1; |
| } |
| int redir_to_debugger (cmdline_t *ptr) |
| { |
| return 1; |
| } |
| int redir_debug_init (cmdline_t *ptr) { return 0; } |
| #endif /* __DJGPP_MINOR < 3 */ |
| |
| extern void _initialize_go32_nat (void); |
| |
| struct env387 |
| { |
| unsigned short control; |
| unsigned short r0; |
| unsigned short status; |
| unsigned short r1; |
| unsigned short tag; |
| unsigned short r2; |
| unsigned long eip; |
| unsigned short code_seg; |
| unsigned short opcode; |
| unsigned long operand; |
| unsigned short operand_seg; |
| unsigned short r3; |
| unsigned char regs[8][10]; |
| }; |
| |
| typedef enum { wp_insert, wp_remove, wp_count } wp_op; |
| |
| /* This holds the current reference counts for each debug register. */ |
| static int dr_ref_count[4]; |
| |
| extern char **environ; |
| |
| #define SOME_PID 42 |
| |
| static int prog_has_started = 0; |
| static void print_387_status (unsigned short status, struct env387 *ep); |
| static void go32_open (char *name, int from_tty); |
| static void go32_close (int quitting); |
| static void go32_attach (char *args, int from_tty); |
| static void go32_detach (char *args, int from_tty); |
| static void go32_resume (int pid, int step, enum target_signal siggnal); |
| static int go32_wait (int pid, struct target_waitstatus *status); |
| static void go32_fetch_registers (int regno); |
| static void store_register (int regno); |
| static void go32_store_registers (int regno); |
| static void go32_prepare_to_store (void); |
| static int go32_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, |
| int write, struct target_ops *target); |
| static void go32_files_info (struct target_ops *target); |
| static void go32_stop (void); |
| static void go32_kill_inferior (void); |
| static void go32_create_inferior (char *exec_file, char *args, char **env); |
| static void cleanup_dregs (void); |
| static void go32_mourn_inferior (void); |
| static int go32_can_run (void); |
| static void ignore (void); |
| static void ignore2 (char *a, int b); |
| static int go32_insert_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr, |
| int len, int rw); |
| static int go32_remove_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr, |
| int len, int rw); |
| static int go32_handle_nonaligned_watchpoint (wp_op what, CORE_ADDR waddr, |
| CORE_ADDR addr, int len, int rw); |
| |
| static struct target_ops go32_ops; |
| static void go32_terminal_init (void); |
| static void go32_terminal_inferior (void); |
| static void go32_terminal_ours (void); |
| |
| static void |
| print_387_status (unsigned short status, struct env387 *ep) |
| { |
| int i; |
| int bothstatus; |
| int top; |
| int fpreg; |
| |
| bothstatus = ((status != 0) && (ep->status != 0)); |
| if (status != 0) |
| { |
| if (bothstatus) |
| printf_unfiltered ("u: "); |
| print_387_status_word (status); |
| } |
| |
| if (ep->status != 0) |
| { |
| if (bothstatus) |
| printf_unfiltered ("e: "); |
| print_387_status_word (ep->status); |
| } |
| |
| print_387_control_word (ep->control & 0xffff); |
| /* Other platforms say "last exception", but that's not true: the |
| FPU stores the last non-control instruction there. */ |
| printf_unfiltered ("last FP instruction: "); |
| /* The ORing with D800h restores the upper 5 bits of the opcode that |
| are not stored by the FPU (since these bits are the same for all |
| floating-point instructions). */ |
| printf_unfiltered ("opcode %s; ", |
| local_hex_string (ep->opcode ? (ep->opcode|0xd800) : 0)); |
| printf_unfiltered ("pc %s:", local_hex_string (ep->code_seg)); |
| printf_unfiltered ("%s; ", local_hex_string (ep->eip)); |
| printf_unfiltered ("operand %s", local_hex_string (ep->operand_seg)); |
| printf_unfiltered (":%s\n", local_hex_string (ep->operand)); |
| |
| top = (ep->status >> 11) & 7; |
| |
| printf_unfiltered ("regno tag msb lsb value\n"); |
| for (fpreg = 7; fpreg >= 0; fpreg--) |
| { |
| /* FNSAVE saves the FP registers in their logical TOP-relative |
| order, beginning with ST(0). Since we need to print them in |
| their physical order, we have to remap them. */ |
| int regno = fpreg - top; |
| long double val; |
| |
| if (regno < 0) |
| regno += 8; |
| |
| printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : " ", fpreg); |
| |
| switch ((ep->tag >> (fpreg * 2)) & 3) |
| { |
| case 0: |
| printf_unfiltered ("valid "); |
| break; |
| case 1: |
| printf_unfiltered ("zero "); |
| break; |
| case 2: |
| /* All other versions of print_387_status use TRAP here, but I |
| think this is misleading, since Intel manuals say SPECIAL. */ |
| printf_unfiltered ("special "); |
| break; |
| case 3: |
| printf_unfiltered ("empty "); |
| break; |
| } |
| for (i = 9; i >= 0; i--) |
| printf_unfiltered ("%02x", ep->regs[regno][i]); |
| |
| REGISTER_CONVERT_TO_VIRTUAL (FP0_REGNUM+regno, builtin_type_long_double, |
| &ep->regs[regno], &val); |
| |
| printf_unfiltered (" %.19LG\n", val); |
| } |
| } |
| |
| void |
| i386_go32_float_info (void) |
| { |
| print_387_status (0, (struct env387 *) &npx); |
| } |
| |
| #define r_ofs(x) (offsetof(TSS,x)) |
| |
| static struct |
| { |
| size_t tss_ofs; |
| size_t size; |
| } |
| regno_mapping[] = |
| { |
| r_ofs (tss_eax), 4, /* normal registers, from a_tss */ |
| r_ofs (tss_ecx), 4, |
| r_ofs (tss_edx), 4, |
| r_ofs (tss_ebx), 4, |
| r_ofs (tss_esp), 4, |
| r_ofs (tss_ebp), 4, |
| r_ofs (tss_esi), 4, |
| r_ofs (tss_edi), 4, |
| r_ofs (tss_eip), 4, |
| r_ofs (tss_eflags), 4, |
| r_ofs (tss_cs), 2, |
| r_ofs (tss_ss), 2, |
| r_ofs (tss_ds), 2, |
| r_ofs (tss_es), 2, |
| r_ofs (tss_fs), 2, |
| r_ofs (tss_gs), 2, |
| 0, 10, /* 8 FP registers, from npx.reg[] */ |
| 1, 10, |
| 2, 10, |
| 3, 10, |
| 4, 10, |
| 5, 10, |
| 6, 10, |
| 7, 10, |
| /* The order of the next 7 registers must be consistent |
| with their numbering in config/i386/tm-go32.h, which see. */ |
| 0, 2, /* control word, from npx */ |
| 4, 2, /* status word, from npx */ |
| 8, 2, /* tag word, from npx */ |
| 16, 2, /* last FP exception CS from npx */ |
| 24, 2, /* last FP exception operand selector from npx */ |
| 12, 4, /* last FP exception EIP from npx */ |
| 20, 4 /* last FP exception operand offset from npx */ |
| }; |
| |
| static struct |
| { |
| int go32_sig; |
| int gdb_sig; |
| } |
| sig_map[] = |
| { |
| 0, TARGET_SIGNAL_FPE, |
| 1, TARGET_SIGNAL_TRAP, |
| /* Exception 2 is triggered by the NMI. DJGPP handles it as SIGILL, |
| but I think SIGBUS is better, since the NMI is usually activated |
| as a result of a memory parity check failure. */ |
| 2, TARGET_SIGNAL_BUS, |
| 3, TARGET_SIGNAL_TRAP, |
| 4, TARGET_SIGNAL_FPE, |
| 5, TARGET_SIGNAL_SEGV, |
| 6, TARGET_SIGNAL_ILL, |
| 7, TARGET_SIGNAL_FPE, |
| 8, TARGET_SIGNAL_SEGV, |
| 9, TARGET_SIGNAL_SEGV, |
| 10, TARGET_SIGNAL_BUS, |
| 11, TARGET_SIGNAL_SEGV, |
| 12, TARGET_SIGNAL_SEGV, |
| 13, TARGET_SIGNAL_SEGV, |
| 14, TARGET_SIGNAL_SEGV, |
| 16, TARGET_SIGNAL_FPE, |
| 17, TARGET_SIGNAL_BUS, |
| 31, TARGET_SIGNAL_ILL, |
| 0x1b, TARGET_SIGNAL_INT, |
| 0x75, TARGET_SIGNAL_FPE, |
| 0x78, TARGET_SIGNAL_ALRM, |
| 0x79, TARGET_SIGNAL_INT, |
| 0x7a, TARGET_SIGNAL_QUIT, |
| -1, -1 |
| }; |
| |
| static struct { |
| enum target_signal gdb_sig; |
| int djgpp_excepno; |
| } excepn_map[] = { |
| TARGET_SIGNAL_0, -1, |
| TARGET_SIGNAL_ILL, 6, /* Invalid Opcode */ |
| TARGET_SIGNAL_EMT, 7, /* triggers SIGNOFP */ |
| TARGET_SIGNAL_SEGV, 13, /* GPF */ |
| TARGET_SIGNAL_BUS, 17, /* Alignment Check */ |
| /* The rest are fake exceptions, see dpmiexcp.c in djlsr*.zip for |
| details. */ |
| TARGET_SIGNAL_TERM, 0x1b, /* triggers Ctrl-Break type of SIGINT */ |
| TARGET_SIGNAL_FPE, 0x75, |
| TARGET_SIGNAL_INT, 0x79, |
| TARGET_SIGNAL_QUIT, 0x7a, |
| TARGET_SIGNAL_ALRM, 0x78, /* triggers SIGTIMR */ |
| TARGET_SIGNAL_PROF, 0x78, |
| -1, -1 |
| }; |
| |
| static void |
| go32_open (char *name, int from_tty) |
| { |
| printf_unfiltered ("Done. Use the \"run\" command to run the program.\n"); |
| } |
| |
| static void |
| go32_close (int quitting) |
| { |
| } |
| |
| static void |
| go32_attach (char *args, int from_tty) |
| { |
| error ("\ |
| You cannot attach to a running program on this platform.\n\ |
| Use the `run' command to run DJGPP programs."); |
| } |
| |
| static void |
| go32_detach (char *args, int from_tty) |
| { |
| } |
| |
| static int resume_is_step; |
| static int resume_signal = -1; |
| |
| static void |
| go32_resume (int pid, int step, enum target_signal siggnal) |
| { |
| int i; |
| |
| resume_is_step = step; |
| |
| if (siggnal != TARGET_SIGNAL_0 && siggnal != TARGET_SIGNAL_TRAP) |
| { |
| for (i = 0, resume_signal = -1; excepn_map[i].gdb_sig != -1; i++) |
| if (excepn_map[i].gdb_sig == siggnal) |
| { |
| resume_signal = excepn_map[i].djgpp_excepno; |
| break; |
| } |
| if (resume_signal == -1) |
| printf_unfiltered ("Cannot deliver signal %s on this platform.\n", |
| target_signal_to_name (siggnal)); |
| } |
| } |
| |
| static char child_cwd[FILENAME_MAX]; |
| |
| static int |
| go32_wait (int pid, struct target_waitstatus *status) |
| { |
| int i; |
| unsigned char saved_opcode; |
| unsigned long INT3_addr; |
| int stepping_over_INT = 0; |
| |
| a_tss.tss_eflags &= 0xfeff; /* reset the single-step flag (TF) */ |
| if (resume_is_step) |
| { |
| /* If the next instruction is INT xx or INTO, we need to handle |
| them specially. Intel manuals say that these instructions |
| reset the single-step flag (a.k.a. TF). However, it seems |
| that, at least in the DPMI environment, and at least when |
| stepping over the DPMI interrupt 31h, the problem is having |
| TF set at all when INT 31h is executed: the debuggee either |
| crashes (and takes the system with it) or is killed by a |
| SIGTRAP. |
| |
| So we need to emulate single-step mode: we put an INT3 opcode |
| right after the INT xx instruction, let the debuggee run |
| until it hits INT3 and stops, then restore the original |
| instruction which we overwrote with the INT3 opcode, and back |
| up the debuggee's EIP to that instruction. */ |
| read_child (a_tss.tss_eip, &saved_opcode, 1); |
| if (saved_opcode == 0xCD || saved_opcode == 0xCE) |
| { |
| unsigned char INT3_opcode = 0xCC; |
| |
| INT3_addr |
| = saved_opcode == 0xCD ? a_tss.tss_eip + 2 : a_tss.tss_eip + 1; |
| stepping_over_INT = 1; |
| read_child (INT3_addr, &saved_opcode, 1); |
| write_child (INT3_addr, &INT3_opcode, 1); |
| } |
| else |
| a_tss.tss_eflags |= 0x0100; /* normal instruction: set TF */ |
| } |
| |
| /* The special value FFFFh in tss_trap indicates to run_child that |
| tss_irqn holds a signal to be delivered to the debuggee. */ |
| if (resume_signal <= -1) |
| { |
| a_tss.tss_trap = 0; |
| a_tss.tss_irqn = 0xff; |
| } |
| else |
| { |
| a_tss.tss_trap = 0xffff; /* run_child looks for this */ |
| a_tss.tss_irqn = resume_signal; |
| } |
| |
| /* The child might change working directory behind our back. The |
| GDB users won't like the side effects of that when they work with |
| relative file names, and GDB might be confused by its current |
| directory not being in sync with the truth. So we always make a |
| point of changing back to where GDB thinks is its cwd, when we |
| return control to the debugger, but restore child's cwd before we |
| run it. */ |
| chdir (child_cwd); |
| |
| #if __DJGPP_MINOR__ < 3 |
| load_npx (); |
| #endif |
| run_child (); |
| #if __DJGPP_MINOR__ < 3 |
| save_npx (); |
| #endif |
| |
| /* Did we step over an INT xx instruction? */ |
| if (stepping_over_INT && a_tss.tss_eip == INT3_addr + 1) |
| { |
| /* Restore the original opcode. */ |
| a_tss.tss_eip--; /* EIP points *after* the INT3 instruction */ |
| write_child (a_tss.tss_eip, &saved_opcode, 1); |
| /* Simulate a TRAP exception. */ |
| a_tss.tss_irqn = 1; |
| a_tss.tss_eflags |= 0x0100; |
| } |
| |
| getcwd (child_cwd, sizeof (child_cwd)); /* in case it has changed */ |
| chdir (current_directory); |
| |
| if (a_tss.tss_irqn == 0x21) |
| { |
| status->kind = TARGET_WAITKIND_EXITED; |
| status->value.integer = a_tss.tss_eax & 0xff; |
| } |
| else |
| { |
| status->value.sig = TARGET_SIGNAL_UNKNOWN; |
| status->kind = TARGET_WAITKIND_STOPPED; |
| for (i = 0; sig_map[i].go32_sig != -1; i++) |
| { |
| if (a_tss.tss_irqn == sig_map[i].go32_sig) |
| { |
| #if __DJGPP_MINOR__ < 3 |
| if ((status->value.sig = sig_map[i].gdb_sig) != |
| TARGET_SIGNAL_TRAP) |
| status->kind = TARGET_WAITKIND_SIGNALLED; |
| #else |
| status->value.sig = sig_map[i].gdb_sig; |
| #endif |
| break; |
| } |
| } |
| } |
| return SOME_PID; |
| } |
| |
| static void |
| go32_fetch_registers (int regno) |
| { |
| /*JHW */ |
| int end_reg = regno + 1; /* just one reg initially */ |
| |
| if (regno < 0) /* do the all registers */ |
| { |
| regno = 0; /* start at first register */ |
| /* # regs in table */ |
| end_reg = sizeof (regno_mapping) / sizeof (regno_mapping[0]); |
| } |
| |
| for (; regno < end_reg; regno++) |
| { |
| if (regno < 16) |
| supply_register (regno, |
| (char *) &a_tss + regno_mapping[regno].tss_ofs); |
| else if (regno < 24) |
| supply_register (regno, |
| (char *) &npx.reg[regno_mapping[regno].tss_ofs]); |
| else if (regno < 31) |
| supply_register (regno, |
| (char *) &npx + regno_mapping[regno].tss_ofs); |
| else |
| fatal ("Invalid register no. %d in go32_fetch_register.", regno); |
| } |
| } |
| |
| static void |
| store_register (int regno) |
| { |
| void *rp; |
| void *v = (void *) ®isters[REGISTER_BYTE (regno)]; |
| |
| if (regno < 16) |
| rp = (char *) &a_tss + regno_mapping[regno].tss_ofs; |
| else if (regno < 24) |
| rp = (char *) &npx.reg[regno_mapping[regno].tss_ofs]; |
| else if (regno < 31) |
| rp = (char *) &npx + regno_mapping[regno].tss_ofs; |
| else |
| fatal ("Invalid register no. %d in store_register.", regno); |
| memcpy (rp, v, regno_mapping[regno].size); |
| } |
| |
| static void |
| go32_store_registers (int regno) |
| { |
| int r; |
| |
| if (regno >= 0) |
| store_register (regno); |
| else |
| { |
| for (r = 0; r < sizeof (regno_mapping) / sizeof (regno_mapping[0]); r++) |
| store_register (r); |
| } |
| } |
| |
| static void |
| go32_prepare_to_store (void) |
| { |
| } |
| |
| static int |
| go32_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, |
| struct target_ops *target) |
| { |
| if (write) |
| { |
| if (write_child (memaddr, myaddr, len)) |
| { |
| return 0; |
| } |
| else |
| { |
| return len; |
| } |
| } |
| else |
| { |
| if (read_child (memaddr, myaddr, len)) |
| { |
| return 0; |
| } |
| else |
| { |
| return len; |
| } |
| } |
| } |
| |
| static cmdline_t child_cmd; /* parsed child's command line kept here */ |
| |
| static void |
| go32_files_info (struct target_ops *target) |
| { |
| printf_unfiltered ("You are running a DJGPP V2 program.\n"); |
| } |
| |
| static void |
| go32_stop (void) |
| { |
| normal_stop (); |
| cleanup_client (); |
| inferior_pid = 0; |
| prog_has_started = 0; |
| } |
| |
| static void |
| go32_kill_inferior (void) |
| { |
| redir_cmdline_delete (&child_cmd); |
| resume_signal = -1; |
| resume_is_step = 0; |
| unpush_target (&go32_ops); |
| } |
| |
| static void |
| go32_create_inferior (char *exec_file, char *args, char **env) |
| { |
| jmp_buf start_state; |
| char *cmdline; |
| char **env_save = environ; |
| |
| if (prog_has_started) |
| { |
| go32_stop (); |
| go32_kill_inferior (); |
| } |
| resume_signal = -1; |
| resume_is_step = 0; |
| /* Init command line storage. */ |
| if (redir_debug_init (&child_cmd) == -1) |
| fatal ("Cannot allocate redirection storage: not enough memory.\n"); |
| |
| /* Parse the command line and create redirections. */ |
| if (strpbrk (args, "<>")) |
| { |
| if (redir_cmdline_parse (args, &child_cmd) == 0) |
| args = child_cmd.command; |
| else |
| error ("Syntax error in command line."); |
| } |
| else |
| child_cmd.command = strdup (args); |
| |
| cmdline = (char *) alloca (strlen (args) + 4); |
| cmdline[0] = strlen (args); |
| strcpy (cmdline + 1, args); |
| cmdline[strlen (args) + 1] = 13; |
| |
| environ = env; |
| |
| if (v2loadimage (exec_file, cmdline, start_state)) |
| { |
| environ = env_save; |
| printf_unfiltered ("Load failed for image %s\n", exec_file); |
| exit (1); |
| } |
| environ = env_save; |
| |
| edi_init (start_state); |
| #if __DJGPP_MINOR__ < 3 |
| save_npx (); |
| #endif |
| |
| inferior_pid = SOME_PID; |
| push_target (&go32_ops); |
| clear_proceed_status (); |
| insert_breakpoints (); |
| proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0); |
| prog_has_started = 1; |
| } |
| |
| static void |
| go32_mourn_inferior (void) |
| { |
| /* We need to make sure all the breakpoint enable bits in the DR7 |
| register are reset when the inferior exits. Otherwise, if they |
| rerun the inferior, the uncleared bits may cause random SIGTRAPs, |
| failure to set more watchpoints, and other calamities. It would |
| be nice if GDB itself would take care to remove all breakpoints |
| at all times, but it doesn't, probably under an assumption that |
| the OS cleans up when the debuggee exits. */ |
| cleanup_dregs (); |
| go32_kill_inferior (); |
| generic_mourn_inferior (); |
| } |
| |
| static int |
| go32_can_run (void) |
| { |
| return 1; |
| } |
| |
| static void |
| ignore (void) |
| { |
| } |
| |
| /* Hardware watchpoint support. */ |
| |
| #define DR_STATUS 6 |
| #define DR_CONTROL 7 |
| #define DR_ENABLE_SIZE 2 |
| #define DR_LOCAL_ENABLE_SHIFT 0 |
| #define DR_GLOBAL_ENABLE_SHIFT 1 |
| #define DR_LOCAL_SLOWDOWN 0x100 |
| #define DR_GLOBAL_SLOWDOWN 0x200 |
| #define DR_CONTROL_SHIFT 16 |
| #define DR_CONTROL_SIZE 4 |
| #define DR_RW_READWRITE 0x3 |
| #define DR_RW_WRITE 0x1 |
| #define DR_CONTROL_MASK 0xf |
| #define DR_ENABLE_MASK 0x3 |
| #define DR_LEN_1 0x0 |
| #define DR_LEN_2 0x4 |
| #define DR_LEN_4 0xc |
| |
| #define D_REGS edi.dr |
| #define CONTROL D_REGS[DR_CONTROL] |
| #define STATUS D_REGS[DR_STATUS] |
| |
| #define IS_REG_FREE(index) \ |
| (!(CONTROL & (3 << (DR_ENABLE_SIZE * (index))))) |
| |
| #define LOCAL_ENABLE_REG(index) \ |
| (CONTROL |= (1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * (index)))) |
| |
| #define GLOBAL_ENABLE_REG(index) \ |
| (CONTROL |= (1 << (DR_GLOBAL_ENABLE_SHIFT + DR_ENABLE_SIZE * (index)))) |
| |
| #define DISABLE_REG(index) \ |
| (CONTROL &= ~(3 << (DR_ENABLE_SIZE * (index)))) |
| |
| #define SET_LOCAL_EXACT() \ |
| (CONTROL |= DR_LOCAL_SLOWDOWN) |
| |
| #define SET_GLOBAL_EXACT() \ |
| (CONTROL |= DR_GLOBAL_SLOWDOWN) |
| |
| #define RESET_LOCAL_EXACT() \ |
| (CONTROL &= ~(DR_LOCAL_SLOWDOWN)) |
| |
| #define RESET_GLOBAL_EXACT() \ |
| (CONTROL &= ~(DR_GLOBAL_SLOWDOWN)) |
| |
| #define SET_BREAK(index,address) \ |
| do {\ |
| CONTROL &= ~(DR_CONTROL_MASK << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (index)));\ |
| D_REGS[index] = address;\ |
| dr_ref_count[index]++;\ |
| } while(0) |
| |
| #define SET_WATCH(index,address,rw,len) \ |
| do {\ |
| SET_BREAK(index,address);\ |
| CONTROL |= ((len)|(rw)) << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (index));\ |
| } while (0) |
| |
| #define IS_WATCH(index) \ |
| (CONTROL & (DR_CONTROL_MASK << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE*(index)))) |
| |
| #define WATCH_HIT(index) ((STATUS & (1 << (index))) && IS_WATCH(index)) |
| |
| #define DR_DEF(index) \ |
| ((CONTROL >> (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (index))) & 0x0f) |
| |
| |
| #if 0 /* use debugging macro */ |
| #define SHOW_DR(text,len) \ |
| do { \ |
| if (!getenv ("GDB_SHOW_DR")) break; \ |
| fprintf(stderr,"%08x %08x ",edi.dr[7],edi.dr[6]); \ |
| fprintf(stderr,"%08x %d %08x %d ", \ |
| edi.dr[0],dr_ref_count[0],edi.dr[1],dr_ref_count[1]); \ |
| fprintf(stderr,"%08x %d %08x %d ", \ |
| edi.dr[2],dr_ref_count[2],edi.dr[3],dr_ref_count[3]); \ |
| fprintf(stderr,(len)?"(%s:%d)\n":"(%s)\n",#text,len); \ |
| } while (0) |
| #else |
| #define SHOW_DR(text,len) do {} while (0) |
| #endif |
| |
| static void |
| cleanup_dregs (void) |
| { |
| int i; |
| |
| CONTROL = 0; |
| STATUS = 0; |
| for (i = 0; i < 4; i++) |
| { |
| D_REGS[i] = 0; |
| dr_ref_count[i] = 0; |
| } |
| } |
| |
| /* Insert a watchpoint. */ |
| |
| int |
| go32_insert_watchpoint (int pid, CORE_ADDR addr, int len, int rw) |
| { |
| int ret = go32_insert_aligned_watchpoint (addr, addr, len, rw); |
| |
| SHOW_DR (insert_watch, len); |
| return ret; |
| } |
| |
| static int |
| go32_insert_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr, |
| int len, int rw) |
| { |
| int i; |
| int read_write_bits, len_bits; |
| |
| /* Values of rw: 0 - write, 1 - read, 2 - access (read and write). |
| However, x86 doesn't support read-only data breakpoints. */ |
| read_write_bits = rw ? DR_RW_READWRITE : DR_RW_WRITE; |
| |
| switch (len) |
| { |
| case 4: |
| len_bits = DR_LEN_4; |
| break; |
| case 2: |
| len_bits = DR_LEN_2; |
| break; |
| case 1: |
| len_bits = DR_LEN_1; |
| break; |
| default: |
| /* The debug registers only have 2 bits for the length, so |
| so this value will always fail the loop below. */ |
| len_bits = 0x10; |
| } |
| |
| /* Look for an occupied debug register with the same address and the |
| same RW and LEN definitions. If we find one, we can use it for |
| this watchpoint as well (and save a register). */ |
| for (i = 0; i < 4; i++) |
| { |
| if (!IS_REG_FREE (i) && D_REGS[i] == addr |
| && DR_DEF (i) == (len_bits | read_write_bits)) |
| { |
| dr_ref_count[i]++; |
| return 0; |
| } |
| } |
| |
| /* Look for a free debug register. */ |
| for (i = 0; i <= 3; i++) |
| { |
| if (IS_REG_FREE (i)) |
| break; |
| } |
| |
| /* No more debug registers! */ |
| if (i > 3) |
| return -1; |
| |
| if (len == 2) |
| { |
| if (addr % 2) |
| return go32_handle_nonaligned_watchpoint (wp_insert, waddr, addr, |
| len, rw); |
| } |
| else if (len == 4) |
| { |
| if (addr % 4) |
| return go32_handle_nonaligned_watchpoint (wp_insert, waddr, addr, |
| len, rw); |
| } |
| else if (len != 1) |
| return go32_handle_nonaligned_watchpoint (wp_insert, waddr, addr, len, rw); |
| |
| SET_WATCH (i, addr, read_write_bits, len_bits); |
| LOCAL_ENABLE_REG (i); |
| SET_LOCAL_EXACT (); |
| SET_GLOBAL_EXACT (); |
| return 0; |
| } |
| |
| static int |
| go32_handle_nonaligned_watchpoint (wp_op what, CORE_ADDR waddr, CORE_ADDR addr, |
| int len, int rw) |
| { |
| int align; |
| int size; |
| int rv = 0, status = 0; |
| |
| static int size_try_array[16] = |
| { |
| 1, 1, 1, 1, /* trying size one */ |
| 2, 1, 2, 1, /* trying size two */ |
| 2, 1, 2, 1, /* trying size three */ |
| 4, 1, 2, 1 /* trying size four */ |
| }; |
| |
| while (len > 0) |
| { |
| align = addr % 4; |
| /* Four is the maximum length for 386. */ |
| size = (len > 4) ? 3 : len - 1; |
| size = size_try_array[size * 4 + align]; |
| if (what == wp_insert) |
| status = go32_insert_aligned_watchpoint (waddr, addr, size, rw); |
| else if (what == wp_remove) |
| status = go32_remove_aligned_watchpoint (waddr, addr, size, rw); |
| else if (what == wp_count) |
| rv++; |
| else |
| status = -1; |
| /* We keep the loop going even after a failure, because some of |
| the other aligned watchpoints might still succeed, e.g. if |
| they watch addresses that are already watched, and thus just |
| increment the reference counts of occupied debug registers. |
| If we break out of the loop too early, we could cause those |
| addresses watched by other watchpoints to be disabled when |
| GDB reacts to our failure to insert this watchpoint and tries |
| to remove it. */ |
| if (status) |
| rv = status; |
| addr += size; |
| len -= size; |
| } |
| return rv; |
| } |
| |
| /* Remove a watchpoint. */ |
| |
| int |
| go32_remove_watchpoint (int pid, CORE_ADDR addr, int len, int rw) |
| { |
| int ret = go32_remove_aligned_watchpoint (addr, addr, len, rw); |
| |
| SHOW_DR (remove_watch, len); |
| return ret; |
| } |
| |
| static int |
| go32_remove_aligned_watchpoint (CORE_ADDR waddr, CORE_ADDR addr, |
| int len, int rw) |
| { |
| int i; |
| int read_write_bits, len_bits; |
| |
| /* Values of rw: 0 - write, 1 - read, 2 - access (read and write). |
| However, x86 doesn't support read-only data breakpoints. */ |
| read_write_bits = rw ? DR_RW_READWRITE : DR_RW_WRITE; |
| |
| switch (len) |
| { |
| case 4: |
| len_bits = DR_LEN_4; |
| break; |
| case 2: |
| len_bits = DR_LEN_2; |
| break; |
| case 1: |
| len_bits = DR_LEN_1; |
| break; |
| default: |
| /* The debug registers only have 2 bits for the length, so |
| so this value will always fail the loop below. */ |
| len_bits = 0x10; |
| } |
| |
| if (len == 2) |
| { |
| if (addr % 2) |
| return go32_handle_nonaligned_watchpoint (wp_remove, waddr, addr, |
| len, rw); |
| } |
| else if (len == 4) |
| { |
| if (addr % 4) |
| return go32_handle_nonaligned_watchpoint (wp_remove, waddr, addr, |
| len, rw); |
| } |
| else if (len != 1) |
| return go32_handle_nonaligned_watchpoint (wp_remove, waddr, addr, len, rw); |
| |
| for (i = 0; i <= 3; i++) |
| { |
| if (!IS_REG_FREE (i) && D_REGS[i] == addr |
| && DR_DEF (i) == (len_bits | read_write_bits)) |
| { |
| dr_ref_count[i]--; |
| if (dr_ref_count[i] == 0) |
| DISABLE_REG (i); |
| } |
| } |
| RESET_LOCAL_EXACT (); |
| RESET_GLOBAL_EXACT (); |
| |
| return 0; |
| } |
| |
| /* Can we use debug registers to watch a region whose address is ADDR |
| and whose length is LEN bytes? */ |
| |
| int |
| go32_region_ok_for_watchpoint (CORE_ADDR addr, int len) |
| { |
| /* Compute how many aligned watchpoints we would need to cover this |
| region. */ |
| int nregs = go32_handle_nonaligned_watchpoint (wp_count, addr, addr, len, 0); |
| |
| return nregs <= 4 ? 1 : 0; |
| } |
| |
| /* Check if stopped by a data watchpoint. If so, return the address |
| whose access triggered the watchpoint. */ |
| |
| CORE_ADDR |
| go32_stopped_by_watchpoint (int pid, int data_watchpoint) |
| { |
| int i, ret = 0; |
| int status; |
| |
| status = edi.dr[DR_STATUS]; |
| SHOW_DR (stopped_by, 0); |
| for (i = 0; i <= 3; i++) |
| { |
| if (WATCH_HIT (i) && data_watchpoint) |
| { |
| SHOW_DR (WP_HIT, 0); |
| ret = D_REGS[i]; |
| } |
| } |
| |
| return ret; |
| } |
| |
| /* Remove a breakpoint. */ |
| |
| int |
| go32_remove_hw_breakpoint (CORE_ADDR addr, CORE_ADDR shadow) |
| { |
| int i; |
| for (i = 0; i <= 3; i++) |
| { |
| if (!IS_REG_FREE (i) && D_REGS[i] == addr && DR_DEF (i) == 0) |
| { |
| dr_ref_count[i]--; |
| if (dr_ref_count[i] == 0) |
| DISABLE_REG (i); |
| } |
| } |
| SHOW_DR (remove_hw, 0); |
| return 0; |
| } |
| |
| int |
| go32_insert_hw_breakpoint (CORE_ADDR addr, CORE_ADDR shadow) |
| { |
| int i; |
| int read_write_bits, len_bits; |
| int free_debug_register; |
| int register_number; |
| |
| /* Look for an occupied debug register with the same address and the |
| same RW and LEN definitions. If we find one, we can use it for |
| this breakpoint as well (and save a register). */ |
| for (i = 0; i < 4; i++) |
| { |
| if (!IS_REG_FREE (i) && D_REGS[i] == addr && DR_DEF (i) == 0) |
| { |
| dr_ref_count[i]++; |
| SHOW_DR (insert_hw, 0); |
| return 0; |
| } |
| } |
| |
| /* Look for a free debug register. */ |
| for (i = 0; i <= 3; i++) |
| { |
| if (IS_REG_FREE (i)) |
| break; |
| } |
| |
| /* No more debug registers? */ |
| if (i < 4) |
| { |
| SET_BREAK (i, addr); |
| LOCAL_ENABLE_REG (i); |
| } |
| SHOW_DR (insert_hw, 0); |
| |
| return i < 4 ? 0 : -1; |
| } |
| |
| /* Put the device open on handle FD into either raw or cooked |
| mode, return 1 if it was in raw mode, zero otherwise. */ |
| |
| static int |
| device_mode (int fd, int raw_p) |
| { |
| int oldmode, newmode; |
| __dpmi_regs regs; |
| |
| regs.x.ax = 0x4400; |
| regs.x.bx = fd; |
| __dpmi_int (0x21, ®s); |
| if (regs.x.flags & 1) |
| return -1; |
| newmode = oldmode = regs.x.dx; |
| |
| if (raw_p) |
| newmode |= 0x20; |
| else |
| newmode &= ~0x20; |
| |
| if (oldmode & 0x80) /* Only for character dev */ |
| { |
| regs.x.ax = 0x4401; |
| regs.x.bx = fd; |
| regs.x.dx = newmode & 0xff; /* Force upper byte zero, else it fails */ |
| __dpmi_int (0x21, ®s); |
| if (regs.x.flags & 1) |
| return -1; |
| } |
| return (oldmode & 0x20) == 0x20; |
| } |
| |
| |
| static int inf_mode_valid = 0; |
| static int inf_terminal_mode; |
| |
| /* This semaphore is needed because, amazingly enough, GDB calls |
| target.to_terminal_ours more than once after the inferior stops. |
| But we need the information from the first call only, since the |
| second call will always see GDB's own cooked terminal. */ |
| static int terminal_is_ours = 1; |
| |
| static void |
| go32_terminal_init (void) |
| { |
| inf_mode_valid = 0; /* reinitialize, in case they are restarting child */ |
| terminal_is_ours = 1; |
| } |
| |
| static void |
| go32_terminal_info (char *args, int from_tty) |
| { |
| printf_unfiltered ("Inferior's terminal is in %s mode.\n", |
| !inf_mode_valid |
| ? "default" : inf_terminal_mode ? "raw" : "cooked"); |
| |
| #if __DJGPP_MINOR__ > 2 |
| if (child_cmd.redirection) |
| { |
| int i; |
| |
| for (i = 0; i < DBG_HANDLES; i++) |
| { |
| if (child_cmd.redirection[i]->file_name) |
| printf_unfiltered ("\tFile handle %d is redirected to `%s'.\n", |
| i, child_cmd.redirection[i]->file_name); |
| else if (_get_dev_info (child_cmd.redirection[i]->inf_handle) == -1) |
| printf_unfiltered |
| ("\tFile handle %d appears to be closed by inferior.\n", i); |
| /* Mask off the raw/cooked bit when comparing device info words. */ |
| else if ((_get_dev_info (child_cmd.redirection[i]->inf_handle) & 0xdf) |
| != (_get_dev_info (i) & 0xdf)) |
| printf_unfiltered |
| ("\tFile handle %d appears to be redirected by inferior.\n", i); |
| } |
| } |
| #endif |
| } |
| |
| static void |
| go32_terminal_inferior (void) |
| { |
| /* Redirect standard handles as child wants them. */ |
| errno = 0; |
| if (redir_to_child (&child_cmd) == -1) |
| { |
| redir_to_debugger (&child_cmd); |
| error ("Cannot redirect standard handles for program: %s.", |
| strerror (errno)); |
| } |
| /* set the console device of the inferior to whatever mode |
| (raw or cooked) we found it last time */ |
| if (terminal_is_ours) |
| { |
| if (inf_mode_valid) |
| device_mode (0, inf_terminal_mode); |
| terminal_is_ours = 0; |
| } |
| } |
| |
| static void |
| go32_terminal_ours (void) |
| { |
| /* Switch to cooked mode on the gdb terminal and save the inferior |
| terminal mode to be restored when it is resumed */ |
| if (!terminal_is_ours) |
| { |
| inf_terminal_mode = device_mode (0, 0); |
| if (inf_terminal_mode != -1) |
| inf_mode_valid = 1; |
| else |
| /* If device_mode returned -1, we don't know what happens with |
| handle 0 anymore, so make the info invalid. */ |
| inf_mode_valid = 0; |
| terminal_is_ours = 1; |
| |
| /* Restore debugger's standard handles. */ |
| errno = 0; |
| if (redir_to_debugger (&child_cmd) == -1) |
| { |
| redir_to_child (&child_cmd); |
| error ("Cannot redirect standard handles for debugger: %s.", |
| strerror (errno)); |
| } |
| } |
| } |
| |
| static void |
| init_go32_ops (void) |
| { |
| go32_ops.to_shortname = "djgpp"; |
| go32_ops.to_longname = "djgpp target process"; |
| go32_ops.to_doc = |
| "Program loaded by djgpp, when gdb is used as an external debugger"; |
| go32_ops.to_open = go32_open; |
| go32_ops.to_close = go32_close; |
| go32_ops.to_attach = go32_attach; |
| go32_ops.to_detach = go32_detach; |
| go32_ops.to_resume = go32_resume; |
| go32_ops.to_wait = go32_wait; |
| go32_ops.to_fetch_registers = go32_fetch_registers; |
| go32_ops.to_store_registers = go32_store_registers; |
| go32_ops.to_prepare_to_store = go32_prepare_to_store; |
| go32_ops.to_xfer_memory = go32_xfer_memory; |
| go32_ops.to_files_info = go32_files_info; |
| go32_ops.to_insert_breakpoint = memory_insert_breakpoint; |
| go32_ops.to_remove_breakpoint = memory_remove_breakpoint; |
| go32_ops.to_terminal_init = go32_terminal_init; |
| go32_ops.to_terminal_inferior = go32_terminal_inferior; |
| go32_ops.to_terminal_ours_for_output = go32_terminal_ours; |
| go32_ops.to_terminal_ours = go32_terminal_ours; |
| go32_ops.to_terminal_info = go32_terminal_info; |
| go32_ops.to_kill = go32_kill_inferior; |
| go32_ops.to_create_inferior = go32_create_inferior; |
| go32_ops.to_mourn_inferior = go32_mourn_inferior; |
| go32_ops.to_can_run = go32_can_run; |
| go32_ops.to_stop = go32_stop; |
| go32_ops.to_stratum = process_stratum; |
| go32_ops.to_has_all_memory = 1; |
| go32_ops.to_has_memory = 1; |
| go32_ops.to_has_stack = 1; |
| go32_ops.to_has_registers = 1; |
| go32_ops.to_has_execution = 1; |
| go32_ops.to_magic = OPS_MAGIC; |
| |
| /* Initialize child's cwd with the current one. */ |
| getcwd (child_cwd, sizeof (child_cwd)); |
| |
| /* Initialize child's command line storage. */ |
| if (redir_debug_init (&child_cmd) == -1) |
| fatal ("Cannot allocate redirection storage: not enough memory.\n"); |
| } |
| |
| void |
| _initialize_go32_nat (void) |
| { |
| init_go32_ops (); |
| add_target (&go32_ops); |
| } |
| |
| pid_t |
| tcgetpgrp (int fd) |
| { |
| if (isatty (fd)) |
| return SOME_PID; |
| errno = ENOTTY; |
| return -1; |
| } |
| |
| int |
| tcsetpgrp (int fd, pid_t pgid) |
| { |
| if (isatty (fd) && pgid == SOME_PID) |
| return 0; |
| errno = pgid == SOME_PID ? ENOTTY : ENOSYS; |
| return -1; |
| } |