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/* Native-dependent code for GNU/Linux on MIPS processors.
Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006
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., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA. */
#include "defs.h"
#include "inferior.h"
#include "mips-tdep.h"
#include "target.h"
#include "linux-nat.h"
#include "mips-linux-tdep.h"
#include "gdb_proc_service.h"
#include <sys/ptrace.h>
#ifndef PTRACE_GET_THREAD_AREA
#define PTRACE_GET_THREAD_AREA 25
#endif
/* Assume that we have PTRACE_GETREGS et al. support. If we do not,
we'll clear this and use PTRACE_PEEKUSER instead. */
static int have_ptrace_regsets = 1;
/* Saved function pointers to fetch and store a single register using
PTRACE_PEEKUSER and PTRACE_POKEUSER. */
void (*super_fetch_registers) (int);
void (*super_store_registers) (int);
/* Pseudo registers can not be read. ptrace does not provide a way to
read (or set) MIPS_PS_REGNUM, and there's no point in reading or
setting MIPS_ZERO_REGNUM. We also can not set BADVADDR, CAUSE, or
FCRIR via ptrace(). */
int
mips_linux_cannot_fetch_register (int regno)
{
if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)
return 0;
else if (regno >= mips_regnum (current_gdbarch)->fp0
&& regno <= mips_regnum (current_gdbarch)->fp0 + 32)
return 0;
else if (regno == mips_regnum (current_gdbarch)->lo
|| regno == mips_regnum (current_gdbarch)->hi
|| regno == mips_regnum (current_gdbarch)->badvaddr
|| regno == mips_regnum (current_gdbarch)->cause
|| regno == mips_regnum (current_gdbarch)->pc
|| regno == mips_regnum (current_gdbarch)->fp_control_status
|| regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
return 0;
else
return 1;
}
int
mips_linux_cannot_store_register (int regno)
{
if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)
return 0;
else if (regno >= FP0_REGNUM && regno <= FP0_REGNUM + 32)
return 0;
else if (regno == mips_regnum (current_gdbarch)->lo
|| regno == mips_regnum (current_gdbarch)->hi
|| regno == mips_regnum (current_gdbarch)->pc
|| regno == mips_regnum (current_gdbarch)->fp_control_status)
return 0;
else
return 1;
}
/* Fetch the thread-local storage pointer for libthread_db. */
ps_err_e
ps_get_thread_area (const struct ps_prochandle *ph,
lwpid_t lwpid, int idx, void **base)
{
if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
return PS_ERR;
/* IDX is the bias from the thread pointer to the beginning of the
thread descriptor. It has to be subtracted due to implementation
quirks in libthread_db. */
*base = (void *) ((char *)*base - idx);
return PS_OK;
}
/* Fetch REGNO (or all registers if REGNO == -1) from the target
using PTRACE_GETREGS et al. */
static void
mips64_linux_regsets_fetch_registers (int regno)
{
int is_fp;
int tid;
if (regno >= mips_regnum (current_gdbarch)->fp0
&& regno <= mips_regnum (current_gdbarch)->fp0 + 32)
is_fp = 1;
else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
is_fp = 1;
else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
is_fp = 1;
else
is_fp = 0;
tid = ptid_get_lwp (inferior_ptid);
if (tid == 0)
tid = ptid_get_pid (inferior_ptid);
if (regno == -1 || !is_fp)
{
mips64_elf_gregset_t regs;
if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1)
{
if (errno == EIO)
{
have_ptrace_regsets = 0;
return;
}
perror_with_name (_("Couldn't get registers"));
}
mips64_supply_gregset (®s);
}
if (regno == -1 || is_fp)
{
mips64_elf_fpregset_t fp_regs;
if (ptrace (PTRACE_GETFPREGS, tid, 0L,
(PTRACE_TYPE_ARG3) &fp_regs) == -1)
{
if (errno == EIO)
{
have_ptrace_regsets = 0;
return;
}
perror_with_name (_("Couldn't get FP registers"));
}
mips64_supply_fpregset (&fp_regs);
}
}
/* Store REGNO (or all registers if REGNO == -1) to the target
using PTRACE_SETREGS et al. */
static void
mips64_linux_regsets_store_registers (int regno)
{
int is_fp;
int tid;
if (regno >= mips_regnum (current_gdbarch)->fp0
&& regno <= mips_regnum (current_gdbarch)->fp0 + 32)
is_fp = 1;
else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
is_fp = 1;
else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
is_fp = 1;
else
is_fp = 0;
tid = ptid_get_lwp (inferior_ptid);
if (tid == 0)
tid = ptid_get_pid (inferior_ptid);
if (regno == -1 || !is_fp)
{
mips64_elf_gregset_t regs;
if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1)
perror_with_name (_("Couldn't get registers"));
mips64_fill_gregset (®s, regno);
if (ptrace (PTRACE_SETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1)
perror_with_name (_("Couldn't set registers"));
}
if (regno == -1 || is_fp)
{
mips64_elf_fpregset_t fp_regs;
if (ptrace (PTRACE_GETFPREGS, tid, 0L,
(PTRACE_TYPE_ARG3) &fp_regs) == -1)
perror_with_name (_("Couldn't get FP registers"));
mips64_fill_fpregset (&fp_regs, regno);
if (ptrace (PTRACE_SETFPREGS, tid, 0L,
(PTRACE_TYPE_ARG3) &fp_regs) == -1)
perror_with_name (_("Couldn't set FP registers"));
}
}
/* Fetch REGNO (or all registers if REGNO == -1) from the target
using any working method. */
static void
mips64_linux_fetch_registers (int regnum)
{
/* Unless we already know that PTRACE_GETREGS does not work, try it. */
if (have_ptrace_regsets)
mips64_linux_regsets_fetch_registers (regnum);
/* If we know, or just found out, that PTRACE_GETREGS does not work, fall
back to PTRACE_PEEKUSER. */
if (!have_ptrace_regsets)
super_fetch_registers (regnum);
}
/* Store REGNO (or all registers if REGNO == -1) to the target
using any working method. */
static void
mips64_linux_store_registers (int regnum)
{
/* Unless we already know that PTRACE_GETREGS does not work, try it. */
if (have_ptrace_regsets)
mips64_linux_regsets_store_registers (regnum);
/* If we know, or just found out, that PTRACE_GETREGS does not work, fall
back to PTRACE_PEEKUSER. */
if (!have_ptrace_regsets)
super_store_registers (regnum);
}
void _initialize_mips_linux_nat (void);
void
_initialize_mips_linux_nat (void)
{
struct target_ops *t = linux_target ();
super_fetch_registers = t->to_fetch_registers;
super_store_registers = t->to_store_registers;
t->to_fetch_registers = mips64_linux_fetch_registers;
t->to_store_registers = mips64_linux_store_registers;
linux_nat_add_target (t);
}
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