freebsd-dev/gnu/usr.bin/binutils/gdbserver/low-fbsd.c
Doug Rabson e3af075499 * Merge gdb/doc/Makefile into binutils/doc/Makefile
* Update build for gdbserver and gdbreplay to work under binutils
* Fix gdbserver to use PT_GETREGS etc to access registers, removing the
  dependancy on the u-area.
* Make gdbserver work on the alpha.
1999-05-02 19:50:18 +00:00

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/* Low level interface to ptrace, for the remote server for GDB.
Copyright (C) 1995 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "defs.h"
#include <sys/wait.h>
#include "frame.h"
#include "inferior.h"
#include <stdio.h>
#include <sys/param.h>
#include <dirent.h>
#include <sys/user.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <sgtty.h>
#include <fcntl.h>
#include <string.h>
/***************Begin MY defs*********************/
int quit_flag = 0;
char registers[REGISTER_BYTES];
/* Index within `registers' of the first byte of the space for
register N. */
char buf2[MAX_REGISTER_RAW_SIZE];
/***************End MY defs*********************/
#include <sys/ptrace.h>
#include <machine/reg.h>
extern char **environ;
extern int inferior_pid;
void quit (), perror_with_name ();
int query ();
/* Start an inferior process and returns its pid.
ALLARGS is a vector of program-name and args.
ENV is the environment vector to pass. */
int
create_inferior (program, allargs)
char *program;
char **allargs;
{
int pid;
pid = fork ();
if (pid < 0)
perror_with_name ("fork");
if (pid == 0)
{
ptrace (PT_TRACE_ME, 0, 0, 0);
execv (program, allargs);
fprintf (stderr, "Cannot exec %s: %s.\n", program, strerror(errno));
fflush (stderr);
_exit (0177);
}
return pid;
}
/* Kill the inferior process. Make us have no inferior. */
void
kill_inferior ()
{
if (inferior_pid == 0)
return;
ptrace (PT_KILL, inferior_pid, 0, 0);
wait (0);
/*************inferior_died ();****VK**************/
}
/* Return nonzero if the given thread is still alive. */
int
mythread_alive (pid)
int pid;
{
return 1;
}
/* Wait for process, returns status */
unsigned char
mywait (status)
char *status;
{
int pid;
int w;
pid = wait (&w);
if (pid != inferior_pid)
perror_with_name ("wait");
if (WIFEXITED (w))
{
fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
*status = 'W';
return ((unsigned char) WEXITSTATUS (w));
}
else if (!WIFSTOPPED (w))
{
fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
*status = 'X';
return ((unsigned char) WTERMSIG (w));
}
fetch_inferior_registers (0);
*status = 'T';
return ((unsigned char) WSTOPSIG (w));
}
/* Resume execution of the inferior process.
If STEP is nonzero, single-step it.
If SIGNAL is nonzero, give it that signal. */
void
myresume (step, signal)
int step;
int signal;
{
errno = 0;
ptrace (step ? PT_STEP : PT_CONTINUE, inferior_pid,
(PTRACE_ARG3_TYPE) 1, signal);
if (errno)
perror_with_name ("ptrace");
}
#if defined(__i386__)
/* this table must line up with REGISTER_NAMES in tm-i386v.h */
/* symbols like 'tEAX' come from <machine/reg.h> */
static int tregmap[] =
{
tEAX, tECX, tEDX, tEBX,
tESP, tEBP, tESI, tEDI,
tEIP, tEFLAGS, tCS, tSS,
tDS, tES, tFS, tGS,
};
static struct save87 pcb_savefpu;
void
fetch_inferior_registers (regno)
int regno;
{
struct reg inferior_registers; /* ptrace order, not gcc/gdb order */
int r;
ptrace (PT_GETREGS, inferior_pid,
(PTRACE_ARG3_TYPE) &inferior_registers, 0);
for (r = 0; r < NUM_REGS; r++)
memcpy (&registers[REGISTER_BYTE (r)], ((int *)&inferior_registers) + tregmap[r], 4);
}
void
store_inferior_registers (regno)
int regno;
{
struct reg inferior_registers; /* ptrace order, not gcc/gdb order */
int r;
ptrace (PT_GETREGS, inferior_pid,
(PTRACE_ARG3_TYPE) &inferior_registers, 0);
for (r = 0; r < NUM_REGS; r++)
memcpy (((int *)&inferior_registers) + tregmap[r], &registers[REGISTER_BYTE (r)], 4);
ptrace (PT_SETREGS, inferior_pid,
(PTRACE_ARG3_TYPE) &inferior_registers, 0);
}
#elif defined(__alpha__)
void
fetch_inferior_registers (regno)
int regno;
{
struct reg regs; /* ptrace order, not gcc/gdb order */
struct fpreg fpregs;
int r;
ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &regs, 0);
ptrace (PT_GETFPREGS, inferior_pid, (PTRACE_ARG3_TYPE) &fpregs, 0);
for (r = 0; r < 31; r++)
memcpy (&registers[REGISTER_BYTE (r)],
&regs.r_regs[r], sizeof(u_int64_t));
for (r = 0; r < 32; r++)
memcpy (&registers[REGISTER_BYTE (r + FP0_REGNUM)],
&fpregs.fpr_regs[r], sizeof(u_int64_t));
memcpy (&registers[REGISTER_BYTE (PC_REGNUM)],
&regs.r_regs[31], sizeof(u_int64_t));
memset (&registers[REGISTER_BYTE (ZERO_REGNUM)], 0, sizeof(u_int64_t));
memset (&registers[REGISTER_BYTE (FP_REGNUM)], 0, sizeof(u_int64_t));
}
void
store_inferior_registers (regno)
int regno;
{
struct reg regs; /* ptrace order, not gcc/gdb order */
struct fpreg fpregs;
int r;
for (r = 0; r < 31; r++)
memcpy (&regs.r_regs[r],
&registers[REGISTER_BYTE (r)], sizeof(u_int64_t));
for (r = 0; r < 32; r++)
memcpy (&fpregs.fpr_regs[r],
&registers[REGISTER_BYTE (r + FP0_REGNUM)], sizeof(u_int64_t));
memcpy (&regs.r_regs[31],
&registers[REGISTER_BYTE (PC_REGNUM)], sizeof(u_int64_t));
ptrace (PT_SETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &regs, 0);
ptrace (PT_SETFPREGS, inferior_pid, (PTRACE_ARG3_TYPE) &fpregs, 0);
}
#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. */
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));
/* Read all the longwords */
for (i = 0; i < count; i++, addr += sizeof (int))
{
buffer[i] = ptrace (PT_READ_I, inferior_pid, (PTRACE_ARG3_TYPE) addr, 0);
}
/* Copy appropriate bytes out of the buffer. */
memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
}
/* 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. */
buffer[0] = ptrace (PT_READ_I, inferior_pid,
(PTRACE_ARG3_TYPE) addr, 0);
if (count > 1)
{
buffer[count - 1]
= ptrace (PT_READ_I, inferior_pid,
(PTRACE_ARG3_TYPE) addr + (count - 1) * sizeof (int), 0);
}
/* Copy data to be written over corresponding part of buffer */
memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);
/* Write the entire buffer. */
for (i = 0; i < count; i++, addr += sizeof (int))
{
errno = 0;
ptrace (PT_WRITE_I, inferior_pid, (PTRACE_ARG3_TYPE) addr, buffer[i]);
if (errno)
return errno;
}
return 0;
}
void
initialize ()
{
inferior_pid = 0;
}
int
have_inferior_p ()
{
return inferior_pid != 0;
}