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211 lines
4.5 KiB
C
211 lines
4.5 KiB
C
/* GNU/Linux/i386 specific low level interface, for the remote server for GDB.
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Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2004, 2005, 2006,
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2007, 2008, 2009 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 3 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, see <http://www.gnu.org/licenses/>. */
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#include "server.h"
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#include "linux-low.h"
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#include "i387-fp.h"
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#include "gdb_proc_service.h"
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#include <sys/ptrace.h>
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#ifdef HAVE_SYS_REG_H
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#include <sys/reg.h>
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#endif
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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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/* Defined in auto-generated file reg-i386-linux.c. */
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void init_registers_i386_linux (void);
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/* This module only supports access to the general purpose registers. */
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#define i386_num_regs 16
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/* This stuff comes from i386-linux-nat.c. */
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/* Mapping between the general-purpose registers in `struct user'
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format and GDB's register array layout. */
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static int i386_regmap[] =
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{
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EAX * 4, ECX * 4, EDX * 4, EBX * 4,
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UESP * 4, EBP * 4, ESI * 4, EDI * 4,
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EIP * 4, EFL * 4, CS * 4, SS * 4,
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DS * 4, ES * 4, FS * 4, GS * 4
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};
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/* Called by 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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unsigned int desc[4];
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if (ptrace (PTRACE_GET_THREAD_AREA, lwpid,
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(void *) idx, (unsigned long) &desc) < 0)
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return PS_ERR;
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*(int *)base = desc[1];
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return PS_OK;
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}
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static int
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i386_cannot_store_register (int regno)
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{
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return (regno >= i386_num_regs);
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}
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static int
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i386_cannot_fetch_register (int regno)
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{
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return (regno >= i386_num_regs);
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}
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#ifdef HAVE_PTRACE_GETREGS
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#include <sys/procfs.h>
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#include <sys/ptrace.h>
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static void
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i386_fill_gregset (void *buf)
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{
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int i;
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for (i = 0; i < i386_num_regs; i++)
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collect_register (i, ((char *) buf) + i386_regmap[i]);
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collect_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4);
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}
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static void
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i386_store_gregset (const void *buf)
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{
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int i;
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for (i = 0; i < i386_num_regs; i++)
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supply_register (i, ((char *) buf) + i386_regmap[i]);
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supply_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4);
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}
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static void
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i386_fill_fpregset (void *buf)
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{
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i387_cache_to_fsave (buf);
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}
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static void
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i386_store_fpregset (const void *buf)
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{
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i387_fsave_to_cache (buf);
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}
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static void
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i386_fill_fpxregset (void *buf)
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{
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i387_cache_to_fxsave (buf);
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}
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static void
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i386_store_fpxregset (const void *buf)
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{
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i387_fxsave_to_cache (buf);
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}
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#endif /* HAVE_PTRACE_GETREGS */
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struct regset_info target_regsets[] = {
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#ifdef HAVE_PTRACE_GETREGS
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{ PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t),
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GENERAL_REGS,
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i386_fill_gregset, i386_store_gregset },
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# ifdef HAVE_PTRACE_GETFPXREGS
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{ PTRACE_GETFPXREGS, PTRACE_SETFPXREGS, sizeof (elf_fpxregset_t),
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EXTENDED_REGS,
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i386_fill_fpxregset, i386_store_fpxregset },
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# endif
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{ PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof (elf_fpregset_t),
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FP_REGS,
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i386_fill_fpregset, i386_store_fpregset },
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#endif /* HAVE_PTRACE_GETREGS */
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{ 0, 0, -1, -1, NULL, NULL }
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};
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static const unsigned char i386_breakpoint[] = { 0xCC };
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#define i386_breakpoint_len 1
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extern int debug_threads;
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static CORE_ADDR
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i386_get_pc ()
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{
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unsigned long pc;
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collect_register_by_name ("eip", &pc);
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if (debug_threads)
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fprintf (stderr, "stop pc (before any decrement) is %08lx\n", pc);
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return pc;
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}
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static void
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i386_set_pc (CORE_ADDR newpc)
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{
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if (debug_threads)
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fprintf (stderr, "set pc to %08lx\n", (long) newpc);
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supply_register_by_name ("eip", &newpc);
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}
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static int
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i386_breakpoint_at (CORE_ADDR pc)
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{
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unsigned char c;
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read_inferior_memory (pc, &c, 1);
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if (c == 0xCC)
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return 1;
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return 0;
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}
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struct linux_target_ops the_low_target = {
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init_registers_i386_linux,
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i386_num_regs,
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i386_regmap,
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i386_cannot_fetch_register,
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i386_cannot_store_register,
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i386_get_pc,
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i386_set_pc,
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i386_breakpoint,
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i386_breakpoint_len,
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NULL,
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1,
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i386_breakpoint_at,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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};
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