4.4BSD/usr/src/contrib/gdb-4.7.lbl/gdb/rs6000-nat.c
/* IBM RS/6000 native-dependent code for GDB, the GNU debugger.
Copyright 1986, 1987, 1989, 1991, 1992 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 "inferior.h"
#include "target.h"
#include "nm.h"
#include <sys/ptrace.h>
#include <sys/reg.h>
#include <sys/param.h>
#include <sys/dir.h>
#include <sys/user.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <a.out.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/core.h>
extern int errno;
static void
exec_one_dummy_insn PARAMS ((void));
/* Conversion from gdb-to-system special purpose register numbers.. */
static int special_regs[] = {
IAR, /* PC_REGNUM */
MSR, /* PS_REGNUM */
CR, /* CR_REGNUM */
LR, /* LR_REGNUM */
CTR, /* CTR_REGNUM */
XER, /* XER_REGNUM */
MQ /* MQ_REGNUM */
};
void
fetch_inferior_registers (regno)
int regno;
{
int ii;
extern char registers[];
if (regno < 0) { /* for all registers */
/* read 32 general purpose registers. */
for (ii=0; ii < 32; ++ii)
*(int*)®isters[REGISTER_BYTE (ii)] =
ptrace (PT_READ_GPR, inferior_pid, (PTRACE_ARG3_TYPE) ii, 0, 0);
/* read general purpose floating point registers. */
for (ii=0; ii < 32; ++ii)
ptrace (PT_READ_FPR, inferior_pid,
(PTRACE_ARG3_TYPE) ®isters [REGISTER_BYTE (FP0_REGNUM+ii)],
FPR0+ii, 0);
/* read special registers. */
for (ii=0; ii <= LAST_SP_REGNUM-FIRST_SP_REGNUM; ++ii)
*(int*)®isters[REGISTER_BYTE (FIRST_SP_REGNUM+ii)] =
ptrace (PT_READ_GPR, inferior_pid, (PTRACE_ARG3_TYPE) special_regs[ii],
0, 0);
registers_fetched ();
return;
}
/* else an individual register is addressed. */
else if (regno < FP0_REGNUM) { /* a GPR */
*(int*)®isters[REGISTER_BYTE (regno)] =
ptrace (PT_READ_GPR, inferior_pid, (PTRACE_ARG3_TYPE) regno, 0, 0);
}
else if (regno <= FPLAST_REGNUM) { /* a FPR */
ptrace (PT_READ_FPR, inferior_pid,
(PTRACE_ARG3_TYPE) ®isters [REGISTER_BYTE (regno)],
(regno-FP0_REGNUM+FPR0), 0);
}
else if (regno <= LAST_SP_REGNUM) { /* a special register */
*(int*)®isters[REGISTER_BYTE (regno)] =
ptrace (PT_READ_GPR, inferior_pid,
(PTRACE_ARG3_TYPE) special_regs[regno-FIRST_SP_REGNUM], 0, 0);
}
else
fprintf (stderr, "gdb error: register no %d not implemented.\n", regno);
register_valid [regno] = 1;
}
/* 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). */
void
store_inferior_registers (regno)
int regno;
{
extern char registers[];
errno = 0;
if (regno == -1) { /* for all registers.. */
int ii;
/* execute one dummy instruction (which is a breakpoint) in inferior
process. So give kernel a chance to do internal house keeping.
Otherwise the following ptrace(2) calls will mess up user stack
since kernel will get confused about the bottom of the stack (%sp) */
exec_one_dummy_insn ();
/* write general purpose registers first! */
for ( ii=GPR0; ii<=GPR31; ++ii) {
ptrace (PT_WRITE_GPR, inferior_pid, (PTRACE_ARG3_TYPE) ii,
*(int*)®isters[REGISTER_BYTE (ii)], 0);
if ( errno ) {
perror ("ptrace write_gpr"); errno = 0;
}
}
/* write floating point registers now. */
for ( ii=0; ii < 32; ++ii) {
ptrace (PT_WRITE_FPR, inferior_pid,
(PTRACE_ARG3_TYPE) ®isters[REGISTER_BYTE (FP0_REGNUM+ii)],
FPR0+ii, 0);
if ( errno ) {
perror ("ptrace write_fpr"); errno = 0;
}
}
/* write special registers. */
for (ii=0; ii <= LAST_SP_REGNUM-FIRST_SP_REGNUM; ++ii) {
ptrace (PT_WRITE_GPR, inferior_pid,
(PTRACE_ARG3_TYPE) special_regs[ii],
*(int*)®isters[REGISTER_BYTE (FIRST_SP_REGNUM+ii)], 0);
if ( errno ) {
perror ("ptrace write_gpr"); errno = 0;
}
}
}
/* else, a specific register number is given... */
else if (regno < FP0_REGNUM) { /* a GPR */
ptrace (PT_WRITE_GPR, inferior_pid, (PTRACE_ARG3_TYPE) regno,
*(int*)®isters[REGISTER_BYTE (regno)], 0);
}
else if (regno <= FPLAST_REGNUM) { /* a FPR */
ptrace (PT_WRITE_FPR, inferior_pid,
(PTRACE_ARG3_TYPE) ®isters[REGISTER_BYTE (regno)],
regno-FP0_REGNUM+FPR0, 0);
}
else if (regno <= LAST_SP_REGNUM) { /* a special register */
ptrace (PT_WRITE_GPR, inferior_pid,
(PTRACE_ARG3_TYPE) special_regs [regno-FIRST_SP_REGNUM],
*(int*)®isters[REGISTER_BYTE (regno)], 0);
}
else
fprintf (stderr, "Gdb error: register no %d not implemented.\n", regno);
if ( errno ) {
perror ("ptrace write"); errno = 0;
}
}
/* Execute one dummy breakpoint instruction. This way we give the kernel
a chance to do some housekeeping and update inferior's internal data,
including u_area. */
static void
exec_one_dummy_insn ()
{
#define DUMMY_INSN_ADDR (TEXT_SEGMENT_BASE)+0x200
unsigned long shadow;
unsigned int status, pid;
/* We plant one dummy breakpoint into DUMMY_INSN_ADDR address. We assume that
this address will never be executed again by the real code. */
target_insert_breakpoint (DUMMY_INSN_ADDR, &shadow);
errno = 0;
ptrace (PT_CONTINUE, inferior_pid, (PTRACE_ARG3_TYPE) DUMMY_INSN_ADDR, 0, 0);
if (errno)
perror ("pt_continue");
do {
pid = wait (&status);
} while (pid != inferior_pid);
target_remove_breakpoint (DUMMY_INSN_ADDR, &shadow);
}
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 */
{
/* fetch GPRs and special registers from the first register section
in core bfd. */
if (which == 0) {
/* copy GPRs first. */
bcopy (core_reg_sect, registers, 32 * 4);
/* gdb's internal register template and bfd's register section layout
should share a common include file. FIXMEmgo */
/* then comes special registes. They are supposed to be in the same
order in gdb template and bfd `.reg' section. */
core_reg_sect += (32 * 4);
bcopy (core_reg_sect, ®isters [REGISTER_BYTE (FIRST_SP_REGNUM)],
(LAST_SP_REGNUM - FIRST_SP_REGNUM + 1) * 4);
}
/* fetch floating point registers from register section 2 in core bfd. */
else if (which == 2)
bcopy (core_reg_sect, ®isters [REGISTER_BYTE (FP0_REGNUM)], 32 * 8);
else
fprintf (stderr, "Gdb error: unknown parameter to fetch_core_registers().\n");
}