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264 lines
7.3 KiB
C
264 lines
7.3 KiB
C
/* Native-dependent code for GNU/Linux on MIPS processors.
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Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
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Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#include "defs.h"
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#include "inferior.h"
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#include "mips-tdep.h"
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#include "target.h"
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#include "linux-nat.h"
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#include "mips-linux-tdep.h"
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#include "gdb_proc_service.h"
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#include <sys/ptrace.h>
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#ifndef PTRACE_GET_THREAD_AREA
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#define PTRACE_GET_THREAD_AREA 25
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#endif
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/* Assume that we have PTRACE_GETREGS et al. support. If we do not,
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we'll clear this and use PTRACE_PEEKUSER instead. */
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static int have_ptrace_regsets = 1;
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/* Saved function pointers to fetch and store a single register using
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PTRACE_PEEKUSER and PTRACE_POKEUSER. */
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void (*super_fetch_registers) (int);
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void (*super_store_registers) (int);
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/* Pseudo registers can not be read. ptrace does not provide a way to
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read (or set) MIPS_PS_REGNUM, and there's no point in reading or
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setting MIPS_ZERO_REGNUM. We also can not set BADVADDR, CAUSE, or
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FCRIR via ptrace(). */
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int
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mips_linux_cannot_fetch_register (int regno)
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{
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if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)
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return 0;
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else if (regno >= mips_regnum (current_gdbarch)->fp0
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&& regno <= mips_regnum (current_gdbarch)->fp0 + 32)
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return 0;
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else if (regno == mips_regnum (current_gdbarch)->lo
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|| regno == mips_regnum (current_gdbarch)->hi
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|| regno == mips_regnum (current_gdbarch)->badvaddr
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|| regno == mips_regnum (current_gdbarch)->cause
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|| regno == mips_regnum (current_gdbarch)->pc
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|| regno == mips_regnum (current_gdbarch)->fp_control_status
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|| regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
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return 0;
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else
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return 1;
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}
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int
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mips_linux_cannot_store_register (int regno)
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{
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if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)
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return 0;
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else if (regno >= FP0_REGNUM && regno <= FP0_REGNUM + 32)
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return 0;
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else if (regno == mips_regnum (current_gdbarch)->lo
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|| regno == mips_regnum (current_gdbarch)->hi
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|| regno == mips_regnum (current_gdbarch)->pc
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|| regno == mips_regnum (current_gdbarch)->fp_control_status)
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return 0;
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else
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return 1;
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}
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/* Fetch the thread-local storage pointer for libthread_db. */
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ps_err_e
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ps_get_thread_area (const struct ps_prochandle *ph,
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lwpid_t lwpid, int idx, void **base)
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{
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if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
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return PS_ERR;
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/* IDX is the bias from the thread pointer to the beginning of the
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thread descriptor. It has to be subtracted due to implementation
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quirks in libthread_db. */
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*base = (void *) ((char *)*base - idx);
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return PS_OK;
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}
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/* Fetch REGNO (or all registers if REGNO == -1) from the target
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using PTRACE_GETREGS et al. */
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static void
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mips64_linux_regsets_fetch_registers (int regno)
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{
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int is_fp;
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int tid;
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if (regno >= mips_regnum (current_gdbarch)->fp0
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&& regno <= mips_regnum (current_gdbarch)->fp0 + 32)
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is_fp = 1;
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else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
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is_fp = 1;
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else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
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is_fp = 1;
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else
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is_fp = 0;
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tid = ptid_get_lwp (inferior_ptid);
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if (tid == 0)
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tid = ptid_get_pid (inferior_ptid);
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if (regno == -1 || !is_fp)
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{
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mips64_elf_gregset_t regs;
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if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1)
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{
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if (errno == EIO)
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{
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have_ptrace_regsets = 0;
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return;
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}
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perror_with_name (_("Couldn't get registers"));
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}
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mips64_supply_gregset (®s);
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}
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if (regno == -1 || is_fp)
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{
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mips64_elf_fpregset_t fp_regs;
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if (ptrace (PTRACE_GETFPREGS, tid, 0L,
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(PTRACE_TYPE_ARG3) &fp_regs) == -1)
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{
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if (errno == EIO)
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{
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have_ptrace_regsets = 0;
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return;
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}
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perror_with_name (_("Couldn't get FP registers"));
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}
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mips64_supply_fpregset (&fp_regs);
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}
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}
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/* Store REGNO (or all registers if REGNO == -1) to the target
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using PTRACE_SETREGS et al. */
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static void
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mips64_linux_regsets_store_registers (int regno)
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{
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int is_fp;
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int tid;
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if (regno >= mips_regnum (current_gdbarch)->fp0
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&& regno <= mips_regnum (current_gdbarch)->fp0 + 32)
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is_fp = 1;
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else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
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is_fp = 1;
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else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
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is_fp = 1;
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else
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is_fp = 0;
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tid = ptid_get_lwp (inferior_ptid);
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if (tid == 0)
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tid = ptid_get_pid (inferior_ptid);
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if (regno == -1 || !is_fp)
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{
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mips64_elf_gregset_t regs;
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if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1)
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perror_with_name (_("Couldn't get registers"));
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mips64_fill_gregset (®s, regno);
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if (ptrace (PTRACE_SETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1)
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perror_with_name (_("Couldn't set registers"));
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}
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if (regno == -1 || is_fp)
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{
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mips64_elf_fpregset_t fp_regs;
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if (ptrace (PTRACE_GETFPREGS, tid, 0L,
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(PTRACE_TYPE_ARG3) &fp_regs) == -1)
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perror_with_name (_("Couldn't get FP registers"));
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mips64_fill_fpregset (&fp_regs, regno);
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if (ptrace (PTRACE_SETFPREGS, tid, 0L,
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(PTRACE_TYPE_ARG3) &fp_regs) == -1)
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perror_with_name (_("Couldn't set FP registers"));
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}
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}
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/* Fetch REGNO (or all registers if REGNO == -1) from the target
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using any working method. */
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static void
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mips64_linux_fetch_registers (int regnum)
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{
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/* Unless we already know that PTRACE_GETREGS does not work, try it. */
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if (have_ptrace_regsets)
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mips64_linux_regsets_fetch_registers (regnum);
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/* If we know, or just found out, that PTRACE_GETREGS does not work, fall
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back to PTRACE_PEEKUSER. */
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if (!have_ptrace_regsets)
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super_fetch_registers (regnum);
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}
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/* Store REGNO (or all registers if REGNO == -1) to the target
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using any working method. */
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static void
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mips64_linux_store_registers (int regnum)
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{
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/* Unless we already know that PTRACE_GETREGS does not work, try it. */
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if (have_ptrace_regsets)
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mips64_linux_regsets_store_registers (regnum);
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/* If we know, or just found out, that PTRACE_GETREGS does not work, fall
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back to PTRACE_PEEKUSER. */
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if (!have_ptrace_regsets)
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super_store_registers (regnum);
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}
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void _initialize_mips_linux_nat (void);
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void
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_initialize_mips_linux_nat (void)
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{
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struct target_ops *t = linux_target ();
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super_fetch_registers = t->to_fetch_registers;
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super_store_registers = t->to_store_registers;
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t->to_fetch_registers = mips64_linux_fetch_registers;
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t->to_store_registers = mips64_linux_store_registers;
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linux_nat_add_target (t);
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}
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