old-cross-binutils/gdb/m68kly-nat.c
1993-10-30 00:16:25 +00:00

277 lines
7.1 KiB
C

/* Native-dependent code for Motorola 680x0 running LynxOS.
Copyright 1986, 1987, 1989, 1991, 1993 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "defs.h"
#include "frame.h"
#include "inferior.h"
#include "gdbcore.h"
#include "target.h"
#include <sys/param.h>
#include <sys/dir.h>
#include <signal.h>
#include <sys/types.h>
#include <itimer.h>
#include <mem.h>
#include <sys/time.h>
#include <resource.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/ptrace.h>
#include <kernel.h>
#include <conf.h>
#include <proc.h>
#include <errno.h>
/* Return the address in the core dump or inferior of register REGNO.
BLOCKEND is the address of the end of the user structure. */
static unsigned int
core_register_addr (regno, blockend)
unsigned int regno, blockend;
{
struct st_entry s;
unsigned int offset;
if (regno >= 0 && regno <= FP_REGNUM)
offset = (char *) &s.ec.regs[regno] - (char *) &s;
else if (regno == SP_REGNUM)
offset = (char *) &s.stackp - (char *) &s;
else if (regno == PS_REGNUM)
offset = (char *) &s.ec.status - (char *) &s;
else if (regno == PC_REGNUM)
offset = (char *) &s.ec.pc - (char *) &s;
else if (regno >= FP0_REGNUM && regno <= (FPC_REGNUM - 1))
offset = (char *) &s.ec.fregs[(regno - FP0_REGNUM) * 3] - (char *) &s;
else if (regno >= FPC_REGNUM && regno <= FPI_REGNUM)
offset = (char *) &s.ec.fcregs[regno - FPC_REGNUM] - (char *) &s;
return blockend + offset;
}
unsigned int
register_addr (regno, blockend)
int regno, blockend;
{
struct st_entry s;
unsigned int offset;
if (regno >= 0 && regno <= FP_REGNUM)
offset = (char *) &s.ec.regs[regno] - (char *) &s.ec;
else if (regno == SP_REGNUM)
offset = (char *) &s.stackp - (char *) &s;
else if (regno == PS_REGNUM)
offset = (char *) &s.ec.status - (char *) &s.ec;
else if (regno == PC_REGNUM)
offset = (char *) &s.ec.pc - (char *) &s.ec;
else if (regno >= FP0_REGNUM && regno <= (FPC_REGNUM - 1))
offset = (char *) &s.ec.fregs[(regno - FP0_REGNUM) * 3] - (char *) &s.ec;
else if (regno >= FPC_REGNUM && regno <= FPI_REGNUM)
offset = (char *) &s.ec.fcregs[regno - FPC_REGNUM] - (char *) &s.ec;
return blockend + offset;
}
#ifdef FETCH_INFERIOR_REGISTERS
/* Fetch one register. */
static void
fetch_register (regno, offset, bpid)
int regno, bpid;
unsigned int offset;
{
char buf[MAX_REGISTER_RAW_SIZE], mess[128];
unsigned int regaddr, i, ptrace_request;
ptrace_request = regno != SP_REGNUM ? PTRACE_PEEKDATA : PTRACE_PEEKUSP;
regaddr = register_addr (regno, offset);
for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
{
errno = 0;
*(int *) &buf[i] = ptrace (ptrace_request, bpid,
(PTRACE_ARG3_TYPE) regaddr, 0);
if (errno != 0)
{
sprintf (mess, "reading register %s (#%d)", reg_names[regno], regno);
perror_with_name (mess);
}
regaddr += sizeof (int);
}
supply_register (regno, buf);
}
static void
store_register (regno, offset, bpid)
int regno, bpid;
unsigned int offset;
{
unsigned int i, regaddr, ptrace_request;
char mess[128];
ptrace_request = regno != SP_REGNUM ? PTRACE_POKEUSER : PTRACE_POKEUSP;
regaddr = register_addr (regno, offset);
for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
{
errno = 0;
ptrace (ptrace_request, bpid, (PTRACE_ARG3_TYPE) regaddr,
*(int *) &registers[REGISTER_BYTE (regno) + i]);
if (errno != 0)
{
sprintf (mess, "writing register %s (#%d)", reg_names[regno], regno);
perror_with_name (mess);
}
regaddr += sizeof (int);
}
}
static unsigned int
fetch_offset (pid, write)
int pid, write;
{
struct st_entry s;
unsigned int specpage_off, offset = (char *) &s.ecp - (char *) &s;
if (write)
{
errno = 0;
specpage_off = ptrace (PTRACE_THREADUSER, pid, (PTRACE_ARG3_TYPE) 0, 0);
if (errno != 0)
perror_with_name ("ptrace");
errno = 0;
offset = ptrace (PTRACE_PEEKTHREAD, pid, (PTRACE_ARG3_TYPE) offset, 0)
- specpage_off;
if (errno != 0)
perror_with_name ("ptrace");
}
else
{
errno = 0;
offset = ptrace (PTRACE_PEEKTHREAD, pid, (PTRACE_ARG3_TYPE) offset, 0);
if (errno != 0)
perror_with_name ("ptrace");
}
return offset;
}
void
fetch_inferior_registers (regno)
int regno;
{
unsigned int offset = fetch_offset (inferior_pid, 0);
if (regno == -1)
{
for (regno = 0; regno < NUM_REGS; regno++)
fetch_register (regno, offset, inferior_pid);
}
else
fetch_register (regno, offset, inferior_pid);
}
void
store_inferior_registers (regno)
int regno;
{
unsigned int offset = fetch_offset (inferior_pid, 1);
if (regno == -1)
{
for (regno = 0; regno < NUM_REGS; regno++)
store_register (regno, offset, inferior_pid);
}
else
store_register (regno, offset, inferior_pid);
}
void
fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
char *core_reg_sect;
unsigned core_reg_size;
int which;
unsigned int reg_addr; /* Unused in this version */
{
unsigned int regno;
for (regno = 0; regno < NUM_REGS; regno++)
{
unsigned int addr;
addr = core_register_addr (regno, (unsigned) 0);
supply_register (regno, core_reg_sect + addr);
}
}
#endif /* FETCH_INFERIOR_REGISTERS */
/* Wait for child to do something. Return pid of child, or -1 in case
of error; store status through argument pointer STATUS. */
int
child_wait (pid, status)
int pid;
int *status;
{
int save_errno;
int thread;
while (1)
{
int sig;
if (attach_flag)
set_sigint_trap(); /* Causes SIGINT to be passed on to the
attached process. */
pid = wait (status);
save_errno = errno;
if (attach_flag)
clear_sigint_trap();
if (pid == -1)
{
if (save_errno == EINTR)
continue;
fprintf (stderr, "Child process unexpectedly missing: %s.\n",
safe_strerror (save_errno));
*status = 42; /* Claim it exited with signal 42 */
return -1;
}
if (pid != PIDGET (inferior_pid)) /* Some other process?!? */
continue;
/* thread = WIFTID (*status);*/
thread = *status >> 16;
/* Initial thread value can only be acquired via wait, so we have to
resort to this hack. */
if (TIDGET (inferior_pid) == 0)
{
inferior_pid = BUILDPID (inferior_pid, thread);
add_thread (inferior_pid);
}
pid = BUILDPID (pid, thread);
return pid;
}
}