587 lines
15 KiB
C
587 lines
15 KiB
C
/*-
|
||
* This code is derived from software copyrighted by the Free Software
|
||
* Foundation.
|
||
*
|
||
* Modified 1991 by Donn Seeley at UUNET Technologies, Inc.
|
||
*/
|
||
|
||
#ifndef lint
|
||
/*static char sccsid[] = "from: @(#)default-dep.c 6.3 (Berkeley) 5/8/91";*/
|
||
static char rcsid[] = "$Id: default-dep.c,v 1.2 1993/08/01 18:48:27 mycroft Exp $";
|
||
#endif /* not lint */
|
||
|
||
/* Low level interface to ptrace, for GDB when running under Unix.
|
||
Copyright (C) 1988, 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"
|
||
|
||
#ifdef USG
|
||
#include <sys/types.h>
|
||
#endif
|
||
|
||
#include <sys/param.h>
|
||
#include <sys/dir.h>
|
||
#include <signal.h>
|
||
#include <sys/ioctl.h>
|
||
/* #include <fcntl.h> Can we live without this? */
|
||
|
||
#ifdef COFF_ENCAPSULATE
|
||
#include "a.out.encap.h"
|
||
#else
|
||
#include <a.out.h>
|
||
#endif
|
||
#ifndef N_SET_MAGIC
|
||
#define N_SET_MAGIC(exec, val) ((exec).a_magic = (val))
|
||
#endif
|
||
|
||
#include <sys/user.h> /* After a.out.h */
|
||
#include <sys/file.h>
|
||
#include <sys/stat.h>
|
||
|
||
extern int errno;
|
||
|
||
/* 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");
|
||
}
|
||
}
|
||
|
||
void
|
||
fetch_inferior_registers ()
|
||
{
|
||
register int regno;
|
||
register unsigned int regaddr;
|
||
char buf[MAX_REGISTER_RAW_SIZE];
|
||
register int i;
|
||
|
||
struct user u;
|
||
unsigned int offset = (char *) &u.u_ar0 - (char *) &u;
|
||
offset = ptrace (3, inferior_pid, offset, 0) - KERNEL_U_ADDR;
|
||
|
||
for (regno = 0; regno < NUM_REGS; regno++)
|
||
{
|
||
regaddr = register_addr (regno, offset);
|
||
for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
|
||
{
|
||
*(int *) &buf[i] = ptrace (3, inferior_pid, regaddr, 0);
|
||
regaddr += sizeof (int);
|
||
}
|
||
supply_register (regno, buf);
|
||
}
|
||
}
|
||
|
||
/* 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;
|
||
{
|
||
register unsigned int regaddr;
|
||
char buf[80];
|
||
|
||
struct user u;
|
||
unsigned int offset = (char *) &u.u_ar0 - (char *) &u;
|
||
offset = ptrace (3, inferior_pid, offset, 0) - KERNEL_U_ADDR;
|
||
|
||
if (regno >= 0)
|
||
{
|
||
regaddr = register_addr (regno, offset);
|
||
errno = 0;
|
||
ptrace (6, inferior_pid, regaddr, read_register (regno));
|
||
if (errno != 0)
|
||
{
|
||
sprintf (buf, "writing register number %d", regno);
|
||
perror_with_name (buf);
|
||
}
|
||
}
|
||
else for (regno = 0; regno < NUM_REGS; regno++)
|
||
{
|
||
regaddr = register_addr (regno, offset);
|
||
errno = 0;
|
||
ptrace (6, inferior_pid, regaddr, read_register (regno));
|
||
if (errno != 0)
|
||
{
|
||
sprintf (buf, "writing all regs, number %d", regno);
|
||
perror_with_name (buf);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* 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 0
|
||
/* This is now done by read_memory, because when this function did it,
|
||
reading a byte or short int hardware port read whole longs, causing
|
||
serious side effects
|
||
such as bus errors and unexpected hardware operation. This would
|
||
also be a problem with ptrace if the inferior process could read
|
||
or write hardware registers, but that's not usually the case. */
|
||
if (remote_debugging)
|
||
buffer[i] = remote_fetch_word (addr);
|
||
else
|
||
#endif
|
||
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)
|
||
return (remote_write_inferior_memory(memaddr, myaddr, len));
|
||
|
||
buffer[0] = ptrace (1, inferior_pid, addr, 0);
|
||
|
||
if (count > 1)
|
||
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;
|
||
ptrace (4, inferior_pid, addr, buffer[i]);
|
||
if (errno)
|
||
return errno;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Work with core dump and executable files, for GDB.
|
||
This code would be in core.c if it weren't machine-dependent. */
|
||
|
||
#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 */
|
||
|
||
/* 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);
|
||
/* 4.2-style (and perhaps also sysV-style) core dump file. */
|
||
{
|
||
struct user u;
|
||
|
||
unsigned int reg_offset;
|
||
|
||
val = myread (corechan, &u, sizeof u);
|
||
if (val < 0)
|
||
perror_with_name ("Not a core file: reading upage");
|
||
if (val != sizeof u)
|
||
error ("Not a core file: could only read %d bytes", val);
|
||
|
||
/* We are depending on exec_file_command having been called
|
||
previously to set exec_data_start. Since the executable
|
||
and the core file share the same text segment, the address
|
||
of the data segment will be the same in both. */
|
||
data_start = exec_data_start;
|
||
|
||
data_end = data_start + NBPG * u.u_dsize;
|
||
stack_start = stack_end - NBPG * u.u_ssize;
|
||
data_offset = NBPG * UPAGES;
|
||
stack_offset = NBPG * (UPAGES + u.u_dsize);
|
||
|
||
/* Some machines put an absolute address in here and some put
|
||
the offset in the upage of the regs. */
|
||
reg_offset = (int) u.u_ar0;
|
||
if (reg_offset > NBPG * UPAGES)
|
||
reg_offset -= KERNEL_U_ADDR;
|
||
|
||
/* I don't know where to find this info.
|
||
So, for now, mark it as not available. */
|
||
N_SET_MAGIC (core_aouthdr, 0);
|
||
|
||
/* Read the register values out of the core file and store
|
||
them where `read_register' will find them. */
|
||
|
||
{
|
||
register int regno;
|
||
|
||
for (regno = 0; regno < NUM_REGS; regno++)
|
||
{
|
||
char buf[MAX_REGISTER_RAW_SIZE];
|
||
|
||
val = lseek (corechan, register_addr (regno, reg_offset), 0);
|
||
if (val < 0
|
||
|| (val = myread (corechan, buf, sizeof buf)) < 0)
|
||
{
|
||
char * buffer = (char *) alloca (strlen (reg_names[regno])
|
||
+ 30);
|
||
strcpy (buffer, "Reading register ");
|
||
strcat (buffer, reg_names[regno]);
|
||
|
||
perror_with_name (buffer);
|
||
}
|
||
|
||
supply_register (regno, buf);
|
||
}
|
||
}
|
||
}
|
||
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;
|
||
|
||
#ifdef HEADER_SEEK_FD
|
||
HEADER_SEEK_FD (execchan);
|
||
#endif
|
||
|
||
val = myread (execchan, &exec_aouthdr, sizeof (AOUTHDR));
|
||
|
||
if (val < 0)
|
||
perror_with_name (filename);
|
||
|
||
text_start = N_TXTADDR (exec_aouthdr);
|
||
exec_data_start = 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;
|
||
|
||
if (fstat (execchan, &st_exec) < 0)
|
||
perror_with_name (filename);
|
||
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);
|
||
}
|