old-cross-binutils/gdb/mips-linux-nat.c
2009-01-03 05:58:08 +00:00

378 lines
11 KiB
C

/* Native-dependent code for GNU/Linux on MIPS processors.
Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
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 3 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, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "inferior.h"
#include "mips-tdep.h"
#include "target.h"
#include "regcache.h"
#include "linux-nat.h"
#include "mips-linux-tdep.h"
#include "target-descriptions.h"
#include "gdb_proc_service.h"
#include "gregset.h"
#include <sgidefs.h>
#include <sys/ptrace.h>
#include "features/mips-linux.c"
#include "features/mips64-linux.c"
#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) (struct regcache *, int);
void (*super_store_registers) (struct regcache *, int);
/* Map gdb internal register number to ptrace ``address''.
These ``addresses'' are normally defined in <asm/ptrace.h>.
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(). */
static CORE_ADDR
mips_linux_register_addr (struct gdbarch *gdbarch, int regno, int store)
{
CORE_ADDR regaddr;
if (regno < 0 || regno >= gdbarch_num_regs (gdbarch))
error (_("Bogon register number %d."), regno);
if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)
regaddr = regno;
else if ((regno >= mips_regnum (gdbarch)->fp0)
&& (regno < mips_regnum (gdbarch)->fp0 + 32))
regaddr = FPR_BASE + (regno - mips_regnum (gdbarch)->fp0);
else if (regno == mips_regnum (gdbarch)->pc)
regaddr = PC;
else if (regno == mips_regnum (gdbarch)->cause)
regaddr = store? (CORE_ADDR) -1 : CAUSE;
else if (regno == mips_regnum (gdbarch)->badvaddr)
regaddr = store? (CORE_ADDR) -1 : BADVADDR;
else if (regno == mips_regnum (gdbarch)->lo)
regaddr = MMLO;
else if (regno == mips_regnum (gdbarch)->hi)
regaddr = MMHI;
else if (regno == mips_regnum (gdbarch)->fp_control_status)
regaddr = FPC_CSR;
else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)
regaddr = store? (CORE_ADDR) -1 : FPC_EIR;
else if (mips_linux_restart_reg_p (gdbarch) && regno == MIPS_RESTART_REGNUM)
regaddr = 0;
else
regaddr = (CORE_ADDR) -1;
return regaddr;
}
static CORE_ADDR
mips64_linux_register_addr (struct gdbarch *gdbarch, int regno, int store)
{
CORE_ADDR regaddr;
if (regno < 0 || regno >= gdbarch_num_regs (gdbarch))
error (_("Bogon register number %d."), regno);
if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)
regaddr = regno;
else if ((regno >= mips_regnum (gdbarch)->fp0)
&& (regno < mips_regnum (gdbarch)->fp0 + 32))
regaddr = MIPS64_FPR_BASE + (regno - gdbarch_fp0_regnum (gdbarch));
else if (regno == mips_regnum (gdbarch)->pc)
regaddr = MIPS64_PC;
else if (regno == mips_regnum (gdbarch)->cause)
regaddr = store? (CORE_ADDR) -1 : MIPS64_CAUSE;
else if (regno == mips_regnum (gdbarch)->badvaddr)
regaddr = store? (CORE_ADDR) -1 : MIPS64_BADVADDR;
else if (regno == mips_regnum (gdbarch)->lo)
regaddr = MIPS64_MMLO;
else if (regno == mips_regnum (gdbarch)->hi)
regaddr = MIPS64_MMHI;
else if (regno == mips_regnum (gdbarch)->fp_control_status)
regaddr = MIPS64_FPC_CSR;
else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)
regaddr = store? (CORE_ADDR) -1 : MIPS64_FPC_EIR;
else if (mips_linux_restart_reg_p (gdbarch) && regno == MIPS_RESTART_REGNUM)
regaddr = 0;
else
regaddr = (CORE_ADDR) -1;
return regaddr;
}
/* 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;
}
/* Wrapper functions. These are only used by libthread_db. */
void
supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
{
if (mips_isa_regsize (get_regcache_arch (regcache)) == 4)
mips_supply_gregset (regcache, (const mips_elf_gregset_t *) gregsetp);
else
mips64_supply_gregset (regcache, (const mips64_elf_gregset_t *) gregsetp);
}
void
fill_gregset (const struct regcache *regcache,
gdb_gregset_t *gregsetp, int regno)
{
if (mips_isa_regsize (get_regcache_arch (regcache)) == 4)
mips_fill_gregset (regcache, (mips_elf_gregset_t *) gregsetp, regno);
else
mips64_fill_gregset (regcache, (mips64_elf_gregset_t *) gregsetp, regno);
}
void
supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)
{
if (mips_isa_regsize (get_regcache_arch (regcache)) == 4)
mips_supply_fpregset (regcache, (const mips_elf_fpregset_t *) fpregsetp);
else
mips64_supply_fpregset (regcache, (const mips64_elf_fpregset_t *) fpregsetp);
}
void
fill_fpregset (const struct regcache *regcache,
gdb_fpregset_t *fpregsetp, int regno)
{
if (mips_isa_regsize (get_regcache_arch (regcache)) == 4)
mips_fill_fpregset (regcache, (mips_elf_fpregset_t *) fpregsetp, regno);
else
mips64_fill_fpregset (regcache, (mips64_elf_fpregset_t *) fpregsetp, regno);
}
/* Fetch REGNO (or all registers if REGNO == -1) from the target
using PTRACE_GETREGS et al. */
static void
mips64_linux_regsets_fetch_registers (struct regcache *regcache, int regno)
{
struct gdbarch *gdbarch = get_regcache_arch (regcache);
int is_fp;
int tid;
if (regno >= mips_regnum (gdbarch)->fp0
&& regno <= mips_regnum (gdbarch)->fp0 + 32)
is_fp = 1;
else if (regno == mips_regnum (gdbarch)->fp_control_status)
is_fp = 1;
else if (regno == mips_regnum (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) &regs) == -1)
{
if (errno == EIO)
{
have_ptrace_regsets = 0;
return;
}
perror_with_name (_("Couldn't get registers"));
}
mips64_supply_gregset (regcache,
(const mips64_elf_gregset_t *) &regs);
}
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 (regcache,
(const mips64_elf_fpregset_t *) &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 (const struct regcache *regcache, int regno)
{
struct gdbarch *gdbarch = get_regcache_arch (regcache);
int is_fp;
int tid;
if (regno >= mips_regnum (gdbarch)->fp0
&& regno <= mips_regnum (gdbarch)->fp0 + 32)
is_fp = 1;
else if (regno == mips_regnum (gdbarch)->fp_control_status)
is_fp = 1;
else if (regno == mips_regnum (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) &regs) == -1)
perror_with_name (_("Couldn't get registers"));
mips64_fill_gregset (regcache, &regs, regno);
if (ptrace (PTRACE_SETREGS, tid, 0L, (PTRACE_TYPE_ARG3) &regs) == -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 (regcache, &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 (struct regcache *regcache, int regnum)
{
/* Unless we already know that PTRACE_GETREGS does not work, try it. */
if (have_ptrace_regsets)
mips64_linux_regsets_fetch_registers (regcache, 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 (regcache, regnum);
}
/* Store REGNO (or all registers if REGNO == -1) to the target
using any working method. */
static void
mips64_linux_store_registers (struct regcache *regcache, int regnum)
{
/* Unless we already know that PTRACE_GETREGS does not work, try it. */
if (have_ptrace_regsets)
mips64_linux_regsets_store_registers (regcache, 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 (regcache, regnum);
}
/* Return the address in the core dump or inferior of register
REGNO. */
static CORE_ADDR
mips_linux_register_u_offset (struct gdbarch *gdbarch, int regno, int store_p)
{
if (mips_abi_regsize (gdbarch) == 8)
return mips64_linux_register_addr (gdbarch, regno, store_p);
else
return mips_linux_register_addr (gdbarch, regno, store_p);
}
static const struct target_desc *
mips_linux_read_description (struct target_ops *ops)
{
/* Report that target registers are a size we know for sure
that we can get from ptrace. */
if (_MIPS_SIM == _ABIO32)
return tdesc_mips_linux;
else
return tdesc_mips64_linux;
}
void _initialize_mips_linux_nat (void);
void
_initialize_mips_linux_nat (void)
{
struct target_ops *t = linux_trad_target (mips_linux_register_u_offset);
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;
t->to_read_description = mips_linux_read_description;
linux_nat_add_target (t);
/* Initialize the standard target descriptions. */
initialize_tdesc_mips_linux ();
initialize_tdesc_mips64_linux ();
}