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- /* Machine-dependent code which would otherwise be in inflow.c and core.c,
- for GDB, the GNU debugger.
- Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc.
-
- This file is part of GDB.
-
- GDB 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 1, or (at your option)
- any later version.
-
- GDB 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 GDB; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #include <stdio.h>
- #include "defs.h"
- #include "param.h"
- #include "frame.h"
- #include "inferior.h"
-
- #include <sys/param.h>
- #include <sys/dir.h>
- #include <sys/user.h>
- #include <signal.h>
- #include <sys/ioctl.h>
- #include <fcntl.h>
-
- #include <sys/ptrace.h>
- #include <machine/reg.h>
-
- #include <a.out.h>
- #include <sys/file.h>
- #include <sys/stat.h>
- #include <sys/core.h>
-
- extern int errno;
- extern int attach_flag;
-
- /* This function simply calls ptrace with the given arguments.
- It exists so that all calls to ptrace are isolated in this
- machine-dependent file. */
- int
- call_ptrace (request, pid, arg3, arg4)
- int request, pid, arg3, arg4;
- {
- return ptrace (request, pid, arg3, arg4);
- }
-
- kill_inferior ()
- {
- if (remote_debugging)
- return;
- if (inferior_pid == 0)
- return;
- ptrace (8, inferior_pid, 0, 0);
- wait (0);
- inferior_died ();
- }
-
- /* This is used when GDB is exiting. It gives less chance of error.*/
-
- kill_inferior_fast ()
- {
- if (remote_debugging)
- return;
- if (inferior_pid == 0)
- return;
- ptrace (8, inferior_pid, 0, 0);
- wait (0);
- }
-
- /* Resume execution of the inferior process.
- If STEP is nonzero, single-step it.
- If SIGNAL is nonzero, give it that signal. */
-
- void
- resume (step, signal)
- int step;
- int signal;
- {
- errno = 0;
- if (remote_debugging)
- remote_resume (step, signal);
- else
- {
- ptrace (step ? 9 : 7, inferior_pid, 1, signal);
- if (errno)
- perror_with_name ("ptrace");
- }
- }
-
- #ifdef ATTACH_DETACH
-
- /* Start debugging the process whose number is PID. */
-
- attach (pid)
- int pid;
- {
- errno = 0;
- ptrace (PTRACE_ATTACH, pid, 0, 0);
- if (errno)
- perror_with_name ("ptrace");
- attach_flag = 1;
- return pid;
- }
-
- /* Stop debugging the process whose number is PID
- and continue it with signal number SIGNAL.
- SIGNAL = 0 means just continue it. */
-
- void
- detach (signal)
- int signal;
- {
- errno = 0;
- ptrace (PTRACE_DETACH, inferior_pid, 1, signal);
- if (errno)
- perror_with_name ("ptrace");
- attach_flag = 0;
- }
- #endif /* ATTACH_DETACH */
-
- void
- fetch_inferior_registers ()
- {
- struct regs inferior_registers;
- #ifdef FP0_REGNUM
- struct fp_status inferior_fp_registers;
- #endif
- extern char registers[];
-
- if (remote_debugging)
- remote_fetch_registers (registers);
- else
- {
- ptrace (PTRACE_GETREGS, inferior_pid, &inferior_registers);
- #ifdef FP0_REGNUM
- ptrace (PTRACE_GETFPREGS, inferior_pid, &inferior_fp_registers);
- #endif
-
- bcopy (&inferior_registers, registers, 16 * 4);
- #ifdef FP0_REGNUM
- bcopy (&inferior_fp_registers, ®isters[REGISTER_BYTE (FP0_REGNUM)],
- sizeof inferior_fp_registers.fps_regs);
- #endif
- *(int *)®isters[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
- *(int *)®isters[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
- #ifdef FP0_REGNUM
- bcopy (&inferior_fp_registers.fps_control,
- ®isters[REGISTER_BYTE (FPC_REGNUM)],
- sizeof inferior_fp_registers - sizeof inferior_fp_registers.fps_regs);
- #endif
- }
- }
-
- /* Store our register values back into the inferior.
- If REGNO is -1, do this for all registers.
- Otherwise, REGNO specifies which register (so we can save time). */
-
- store_inferior_registers (regno)
- int regno;
- {
- struct regs inferior_registers;
- struct fp_status inferior_fp_registers;
- extern char registers[];
-
- if (remote_debugging)
- remote_store_registers (registers);
- else
- {
- bcopy (registers, &inferior_registers, 16 * 4);
- #ifdef FP0_REGNUM
- bcopy (®isters[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers,
- sizeof inferior_fp_registers.fps_regs);
- #endif
- inferior_registers.r_ps = *(int *)®isters[REGISTER_BYTE (PS_REGNUM)];
- inferior_registers.r_pc = *(int *)®isters[REGISTER_BYTE (PC_REGNUM)];
-
- #ifdef FP0_REGNUM
- bcopy (®isters[REGISTER_BYTE (FPC_REGNUM)],
- &inferior_fp_registers.fps_control,
- sizeof inferior_fp_registers - sizeof inferior_fp_registers.fps_regs);
- #endif
-
- ptrace (PTRACE_SETREGS, inferior_pid, &inferior_registers);
- #if FP0_REGNUM
- ptrace (PTRACE_SETFPREGS, inferior_pid, &inferior_fp_registers);
- #endif
- }
- }
-
- /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
- in the NEW_SUN_PTRACE case.
- It ought to be straightforward. But it appears that writing did
- not write the data that I specified. I cannot understand where
- it got the data that it actually did write. */
-
- /* Copy LEN bytes from inferior's memory starting at MEMADDR
- to debugger memory starting at MYADDR.
- On failure (cannot read from inferior, usually because address is out
- of bounds) returns the value of errno. */
-
- int
- read_inferior_memory (memaddr, myaddr, len)
- CORE_ADDR memaddr;
- char *myaddr;
- int len;
- {
- register int i;
- /* Round starting address down to longword boundary. */
- register CORE_ADDR addr = memaddr & - sizeof (int);
- /* Round ending address up; get number of longwords that makes. */
- register int count
- = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
- /* Allocate buffer of that many longwords. */
- register int *buffer = (int *) alloca (count * sizeof (int));
- extern int errno;
-
- /* Read all the longwords */
- for (i = 0; i < count; i++, addr += sizeof (int))
- {
- errno = 0;
- if (remote_debugging)
- buffer[i] = remote_fetch_word (addr);
- else
- buffer[i] = ptrace (1, inferior_pid, addr, 0);
- if (errno)
- return errno;
- }
-
- /* Copy appropriate bytes out of the buffer. */
- bcopy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);
- return 0;
- }
-
- /* Copy LEN bytes of data from debugger memory at MYADDR
- to inferior's memory at MEMADDR.
- On failure (cannot write the inferior)
- returns the value of errno. */
-
- int
- write_inferior_memory (memaddr, myaddr, len)
- CORE_ADDR memaddr;
- char *myaddr;
- int len;
- {
- register int i;
- /* Round starting address down to longword boundary. */
- register CORE_ADDR addr = memaddr & - sizeof (int);
- /* Round ending address up; get number of longwords that makes. */
- register int count
- = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
- /* Allocate buffer of that many longwords. */
- register int *buffer = (int *) alloca (count * sizeof (int));
- extern int errno;
-
- /* Fill start and end extra bytes of buffer with existing memory data. */
-
- if (remote_debugging)
- buffer[0] = remote_fetch_word (addr);
- else
- buffer[0] = ptrace (1, inferior_pid, addr, 0);
-
- if (count > 1)
- {
- if (remote_debugging)
- buffer[count - 1]
- = remote_fetch_word (addr + (count - 1) * sizeof (int));
- else
- buffer[count - 1]
- = ptrace (1, inferior_pid,
- addr + (count - 1) * sizeof (int), 0);
- }
-
- /* Copy data to be written over corresponding part of buffer */
-
- bcopy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
-
- /* Write the entire buffer. */
-
- for (i = 0; i < count; i++, addr += sizeof (int))
- {
- errno = 0;
- if (remote_debugging)
- remote_store_word (addr, buffer[i]);
- else
- ptrace (4, inferior_pid, addr, buffer[i]);
- if (errno)
- return errno;
- }
-
- return 0;
- }
-
-
- /* Machine-dependent code which would otherwise be in core.c */
- /* Work with core dump and executable files, for GDB. */
-
- #ifndef N_TXTADDR
- #define N_TXTADDR(hdr) 0
- #endif /* no N_TXTADDR */
-
- #ifndef N_DATADDR
- #define N_DATADDR(hdr) hdr.a_text
- #endif /* no N_DATADDR */
-
- /* Non-zero if this is an object (.o) file, rather than an executable.
- Distinguishing between the two is rarely necessary (and seems like
- a hack, but there is no other way to get the text and data
- addresses--N_TXTADDR should probably take care of
- this, but it doesn't). */
- /* This definition will not work
- if someone decides to make ld preserve relocation info. */
- #define IS_OBJECT_FILE(hdr) (hdr.a_trsize != 0)
-
- /* Make COFF and non-COFF names for things a little more compatible
- to reduce conditionals later. */
-
- #ifdef COFF_FORMAT
- #define a_magic magic
- #endif
-
- #ifndef COFF_FORMAT
- #ifndef AOUTHDR
- #define AOUTHDR struct exec
- #endif
- #endif
-
- extern char *sys_siglist[];
-
- /* Hook for `exec_file_command' command to call. */
-
- extern void (*exec_file_display_hook) ();
-
- /* File names of core file and executable file. */
-
- extern char *corefile;
- extern char *execfile;
-
- /* Descriptors on which core file and executable file are open.
- Note that the execchan is closed when an inferior is created
- and reopened if the inferior dies or is killed. */
-
- extern int corechan;
- extern int execchan;
-
- /* Last modification time of executable file.
- Also used in source.c to compare against mtime of a source file. */
-
- extern int exec_mtime;
-
- /* Virtual addresses of bounds of the two areas of memory in the core file. */
-
- extern CORE_ADDR data_start;
- extern CORE_ADDR data_end;
- extern CORE_ADDR stack_start;
- extern CORE_ADDR stack_end;
-
- /* Virtual addresses of bounds of two areas of memory in the exec file.
- Note that the data area in the exec file is used only when there is no core file. */
-
- extern CORE_ADDR text_start;
- extern CORE_ADDR text_end;
-
- extern CORE_ADDR exec_data_start;
- extern CORE_ADDR exec_data_end;
-
- /* Address in executable file of start of text area data. */
-
- extern int text_offset;
-
- /* Address in executable file of start of data area data. */
-
- extern int exec_data_offset;
-
- /* Address in core file of start of data area data. */
-
- extern int data_offset;
-
- /* Address in core file of start of stack area data. */
-
- extern int stack_offset;
-
- #ifdef COFF_FORMAT
- /* various coff data structures */
-
- extern FILHDR file_hdr;
- extern SCNHDR text_hdr;
- extern SCNHDR data_hdr;
-
- #endif /* not COFF_FORMAT */
-
- /* a.out header saved in core file. */
-
- extern AOUTHDR core_aouthdr;
-
- /* a.out header of exec file. */
-
- extern AOUTHDR exec_aouthdr;
-
- extern void validate_files ();
-
- core_file_command (filename, from_tty)
- char *filename;
- int from_tty;
- {
- int val;
- extern char registers[];
-
- /* Discard all vestiges of any previous core file
- and mark data and stack spaces as empty. */
-
- if (corefile)
- free (corefile);
- corefile = 0;
-
- if (corechan >= 0)
- close (corechan);
- corechan = -1;
-
- data_start = 0;
- data_end = 0;
- stack_start = STACK_END_ADDR;
- stack_end = STACK_END_ADDR;
-
- /* Now, if a new core file was specified, open it and digest it. */
-
- if (filename)
- {
- filename = tilde_expand (filename);
- make_cleanup (free, filename);
-
- if (have_inferior_p ())
- error ("To look at a core file, you must kill the inferior with \"kill\".");
- corechan = open (filename, O_RDONLY, 0);
- if (corechan < 0)
- perror_with_name (filename);
-
- {
- struct core corestr;
-
- val = myread (corechan, &corestr, sizeof corestr);
- if (val < 0)
- perror_with_name (filename);
- if (corestr.c_magic != CORE_MAGIC)
- error ("\"%s\" does not appear to be a core dump file (magic 0x%x, expected 0x%x)",
- filename, corestr.c_magic, (int) CORE_MAGIC);
- else if (sizeof (struct core) != corestr.c_len)
- error ("\"%s\" has an invalid struct core length (%d, expected %d)",
- filename, corestr.c_len, (int) sizeof (struct core));
-
- data_start = exec_data_start;
- data_end = data_start + corestr.c_dsize;
- stack_start = stack_end - corestr.c_ssize;
- data_offset = sizeof corestr;
- stack_offset = sizeof corestr + corestr.c_dsize;
-
- bcopy (&corestr.c_regs, registers, 16 * 4);
- *(int *)®isters[REGISTER_BYTE (PS_REGNUM)] = corestr.c_regs.r_ps;
- *(int *)®isters[REGISTER_BYTE (PC_REGNUM)] = corestr.c_regs.r_pc;
- #ifdef FP0_REGNUM
- #ifdef FPU
- bcopy (corestr.c_fpu.f_fpstatus.fps_regs,
- ®isters[REGISTER_BYTE (FP0_REGNUM)],
- sizeof corestr.c_fpu.f_fpstatus.fps_regs);
- bcopy (&corestr.c_fpu.f_fpstatus.fps_control,
- ®isters[REGISTER_BYTE (FPC_REGNUM)],
- sizeof corestr.c_fpu.f_fpstatus - sizeof corestr.c_fpu.f_fpstatus.fps_regs);
- #else
- bcopy (corestr.c_fpstatus.fps_regs,
- ®isters[REGISTER_BYTE (FP0_REGNUM)],
- sizeof corestr.c_fpstatus.fps_regs);
- bcopy (&corestr.c_fpstatus.fps_control,
- ®isters[REGISTER_BYTE (FPC_REGNUM)],
- sizeof corestr.c_fpstatus - sizeof corestr.c_fpstatus.fps_regs);
- #endif
- #endif
- bcopy (&corestr.c_aouthdr, &core_aouthdr, sizeof (struct exec));
-
- printf ("Core file is from \"%s\".\n", corestr.c_cmdname);
- if (corestr.c_signo > 0)
- printf ("Program terminated with signal %d, %s.\n",
- corestr.c_signo,
- corestr.c_signo < NSIG
- ? sys_siglist[corestr.c_signo]
- : "(undocumented)");
- }
- if (filename[0] == '/')
- corefile = savestring (filename, strlen (filename));
- else
- {
- corefile = concat (current_directory, "/", filename);
- }
-
- set_current_frame ( create_new_frame (read_register (FP_REGNUM),
- read_pc ()));
- select_frame (get_current_frame (), 0);
- validate_files ();
- }
- else if (from_tty)
- printf ("No core file now.\n");
- }
-
- exec_file_command (filename, from_tty)
- char *filename;
- int from_tty;
- {
- int val;
-
- /* Eliminate all traces of old exec file.
- Mark text segment as empty. */
-
- if (execfile)
- free (execfile);
- execfile = 0;
- data_start = 0;
- data_end -= exec_data_start;
- text_start = 0;
- text_end = 0;
- exec_data_start = 0;
- exec_data_end = 0;
- if (execchan >= 0)
- close (execchan);
- execchan = -1;
-
- /* Now open and digest the file the user requested, if any. */
-
- if (filename)
- {
- filename = tilde_expand (filename);
- make_cleanup (free, filename);
-
- execchan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0,
- &execfile);
- if (execchan < 0)
- perror_with_name (filename);
-
- #ifdef COFF_FORMAT
- {
- int aout_hdrsize;
- int num_sections;
-
- if (read_file_hdr (execchan, &file_hdr) < 0)
- error ("\"%s\": not in executable format.", execfile);
-
- aout_hdrsize = file_hdr.f_opthdr;
- num_sections = file_hdr.f_nscns;
-
- if (read_aout_hdr (execchan, &exec_aouthdr, aout_hdrsize) < 0)
- error ("\"%s\": can't read optional aouthdr", execfile);
-
- if (read_section_hdr (execchan, _TEXT, &text_hdr, num_sections,
- aout_hdrsize) < 0)
- error ("\"%s\": can't read text section header", execfile);
-
- if (read_section_hdr (execchan, _DATA, &data_hdr, num_sections,
- aout_hdrsize) < 0)
- error ("\"%s\": can't read data section header", execfile);
-
- text_start = exec_aouthdr.text_start;
- text_end = text_start + exec_aouthdr.tsize;
- text_offset = text_hdr.s_scnptr;
- exec_data_start = exec_aouthdr.data_start;
- exec_data_end = exec_data_start + exec_aouthdr.dsize;
- exec_data_offset = data_hdr.s_scnptr;
- data_start = exec_data_start;
- data_end += exec_data_start;
- exec_mtime = file_hdr.f_timdat;
- }
- #else /* not COFF_FORMAT */
- {
- struct stat st_exec;
- val = myread (execchan, &exec_aouthdr, sizeof (AOUTHDR));
-
- if (val < 0)
- perror_with_name (filename);
-
- text_start =
- IS_OBJECT_FILE (exec_aouthdr) ? 0 : N_TXTADDR (exec_aouthdr);
- exec_data_start = IS_OBJECT_FILE (exec_aouthdr)
- ? exec_aouthdr.a_text : N_DATADDR (exec_aouthdr);
- text_offset = N_TXTOFF (exec_aouthdr);
- exec_data_offset = N_TXTOFF (exec_aouthdr) + exec_aouthdr.a_text;
-
- text_end = text_start + exec_aouthdr.a_text;
- exec_data_end = exec_data_start + exec_aouthdr.a_data;
- data_start = exec_data_start;
- data_end += exec_data_start;
-
- fstat (execchan, &st_exec);
- exec_mtime = st_exec.st_mtime;
- }
- #endif /* not COFF_FORMAT */
-
- validate_files ();
- }
- else if (from_tty)
- printf ("No exec file now.\n");
-
- /* Tell display code (if any) about the changed file name. */
- if (exec_file_display_hook)
- (*exec_file_display_hook) (filename);
- }
-
-