644 lines
15 KiB
C
644 lines
15 KiB
C
/* GNU/Linux/x86-64 specific low level interface, for the remote server
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for GDB.
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Copyright (C) 2002, 2004, 2005, 2006, 2007, 2008, 2009
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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 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 <signal.h>
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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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/* NOTE: gdb_proc_service.h may include linux/elf.h.
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We need Elf32_Phdr. If we don't get linux/elf.h we could include
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elf.h like linux-ppc-low.c does. */
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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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/* Defined in auto-generated file reg-x86-64-linux.c. */
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void init_registers_x86_64_linux (void);
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#include <sys/reg.h>
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#include <sys/procfs.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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/* This definition comes from prctl.h, but some kernels may not have it. */
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#ifndef PTRACE_ARCH_PRCTL
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#define PTRACE_ARCH_PRCTL 30
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#endif
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/* The following definitions come from prctl.h, but may be absent
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for certain configurations. */
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#ifndef ARCH_GET_FS
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#define ARCH_SET_GS 0x1001
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#define ARCH_SET_FS 0x1002
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#define ARCH_GET_FS 0x1003
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#define ARCH_GET_GS 0x1004
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#endif
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#ifdef __x86_64__
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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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Note that the transfer layout uses 64-bit regs. */
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static /*const*/ int i386_regmap[] =
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{
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RAX * 8, RCX * 8, RDX * 8, RBX * 8,
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RSP * 8, RBP * 8, RSI * 8, RDI * 8,
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RIP * 8, EFLAGS * 8, CS * 8, SS * 8,
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DS * 8, ES * 8, FS * 8, GS * 8
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};
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#define I386_NUM_REGS (sizeof (i386_regmap) / sizeof (i386_regmap[0]))
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/* So code below doesn't have to care, i386 or amd64. */
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#define ORIG_EAX ORIG_RAX
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static const int x86_64_regmap[] =
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{
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RAX * 8, RBX * 8, RCX * 8, RDX * 8,
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RSI * 8, RDI * 8, RBP * 8, RSP * 8,
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R8 * 8, R9 * 8, R10 * 8, R11 * 8,
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R12 * 8, R13 * 8, R14 * 8, R15 * 8,
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RIP * 8, EFLAGS * 8, CS * 8, SS * 8,
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DS * 8, ES * 8, FS * 8, GS * 8,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1,
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ORIG_RAX * 8
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};
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#define X86_64_NUM_REGS (sizeof (x86_64_regmap) / sizeof (x86_64_regmap[0]))
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#else /* ! __x86_64__ */
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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 /*const*/ 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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#define I386_NUM_REGS (sizeof (i386_regmap) / sizeof (i386_regmap[0]))
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#endif
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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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#ifdef __x86_64__
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int use_64bit = register_size (0) == 8;
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if (use_64bit)
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{
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switch (idx)
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{
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case FS:
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if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0)
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return PS_OK;
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break;
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case GS:
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if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0)
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return PS_OK;
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break;
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default:
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return PS_BADADDR;
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}
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return PS_ERR;
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}
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#endif
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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 *) (intptr_t) 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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}
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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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static void
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x86_fill_gregset (void *buf)
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{
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int i;
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#ifdef __x86_64__
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if (register_size (0) == 8)
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{
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for (i = 0; i < X86_64_NUM_REGS; i++)
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if (x86_64_regmap[i] != -1)
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collect_register (i, ((char *) buf) + x86_64_regmap[i]);
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return;
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}
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#endif
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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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x86_store_gregset (const void *buf)
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{
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int i;
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#ifdef __x86_64__
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if (register_size (0) == 8)
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{
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for (i = 0; i < X86_64_NUM_REGS; i++)
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if (x86_64_regmap[i] != -1)
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supply_register (i, ((char *) buf) + x86_64_regmap[i]);
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return;
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}
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#endif
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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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x86_fill_fpregset (void *buf)
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{
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#ifdef __x86_64__
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i387_cache_to_fxsave (buf);
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#else
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i387_cache_to_fsave (buf);
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#endif
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}
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static void
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x86_store_fpregset (const void *buf)
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{
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#ifdef __x86_64__
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i387_fxsave_to_cache (buf);
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#else
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i387_fsave_to_cache (buf);
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#endif
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}
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#ifndef __x86_64__
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static void
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x86_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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x86_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
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/* ??? The non-biarch i386 case stores all the i387 regs twice.
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Once in i387_.*fsave.* and once in i387_.*fxsave.*.
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This is, presumably, to handle the case where PTRACE_[GS]ETFPXREGS
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doesn't work. IWBN to avoid the duplication in the case where it
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does work. Maybe the arch_setup routine could check whether it works
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and update target_regsets accordingly, maybe by moving target_regsets
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to linux_target_ops and set the right one there, rather than having to
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modify the target_regsets global. */
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struct regset_info target_regsets[] =
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{
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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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x86_fill_gregset, x86_store_gregset },
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# ifndef __x86_64__
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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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x86_fill_fpxregset, x86_store_fpxregset },
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# endif
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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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x86_fill_fpregset, x86_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 CORE_ADDR
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x86_get_pc (void)
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{
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int use_64bit = register_size (0) == 8;
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if (use_64bit)
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{
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unsigned long pc;
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collect_register_by_name ("rip", &pc);
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return (CORE_ADDR) pc;
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}
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else
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{
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unsigned int pc;
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collect_register_by_name ("eip", &pc);
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return (CORE_ADDR) pc;
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}
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}
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static void
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x86_set_pc (CORE_ADDR pc)
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{
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int use_64bit = register_size (0) == 8;
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if (use_64bit)
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{
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unsigned long newpc = pc;
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supply_register_by_name ("rip", &newpc);
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}
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else
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{
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unsigned int newpc = pc;
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supply_register_by_name ("eip", &newpc);
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}
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}
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static const unsigned char x86_breakpoint[] = { 0xCC };
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#define x86_breakpoint_len 1
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static int
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x86_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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/* When GDBSERVER is built as a 64-bit application on linux, the
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PTRACE_GETSIGINFO data is always presented in 64-bit layout. Since
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debugging a 32-bit inferior with a 64-bit GDBSERVER should look the same
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as debugging it with a 32-bit GDBSERVER, we do the 32-bit <-> 64-bit
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conversion in-place ourselves. */
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/* These types below (compat_*) define a siginfo type that is layout
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compatible with the siginfo type exported by the 32-bit userspace
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support. */
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#ifdef __x86_64__
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typedef int compat_int_t;
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typedef unsigned int compat_uptr_t;
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typedef int compat_time_t;
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typedef int compat_timer_t;
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typedef int compat_clock_t;
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struct compat_timeval
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{
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compat_time_t tv_sec;
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int tv_usec;
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};
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typedef union compat_sigval
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{
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compat_int_t sival_int;
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compat_uptr_t sival_ptr;
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} compat_sigval_t;
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typedef struct compat_siginfo
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{
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int si_signo;
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int si_errno;
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int si_code;
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union
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{
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int _pad[((128 / sizeof (int)) - 3)];
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/* kill() */
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struct
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{
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unsigned int _pid;
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unsigned int _uid;
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} _kill;
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/* POSIX.1b timers */
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struct
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{
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compat_timer_t _tid;
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int _overrun;
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compat_sigval_t _sigval;
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} _timer;
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/* POSIX.1b signals */
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struct
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{
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unsigned int _pid;
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unsigned int _uid;
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compat_sigval_t _sigval;
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} _rt;
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/* SIGCHLD */
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struct
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{
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unsigned int _pid;
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unsigned int _uid;
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int _status;
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compat_clock_t _utime;
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compat_clock_t _stime;
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} _sigchld;
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/* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
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struct
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{
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unsigned int _addr;
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} _sigfault;
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/* SIGPOLL */
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struct
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{
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int _band;
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int _fd;
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} _sigpoll;
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} _sifields;
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} compat_siginfo_t;
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#define cpt_si_pid _sifields._kill._pid
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#define cpt_si_uid _sifields._kill._uid
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#define cpt_si_timerid _sifields._timer._tid
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#define cpt_si_overrun _sifields._timer._overrun
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#define cpt_si_status _sifields._sigchld._status
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#define cpt_si_utime _sifields._sigchld._utime
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#define cpt_si_stime _sifields._sigchld._stime
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#define cpt_si_ptr _sifields._rt._sigval.sival_ptr
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#define cpt_si_addr _sifields._sigfault._addr
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#define cpt_si_band _sifields._sigpoll._band
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#define cpt_si_fd _sifields._sigpoll._fd
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/* glibc at least up to 2.3.2 doesn't have si_timerid, si_overrun.
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In their place is si_timer1,si_timer2. */
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#ifndef si_timerid
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#define si_timerid si_timer1
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#endif
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#ifndef si_overrun
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#define si_overrun si_timer2
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#endif
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static void
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compat_siginfo_from_siginfo (compat_siginfo_t *to, siginfo_t *from)
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{
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memset (to, 0, sizeof (*to));
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to->si_signo = from->si_signo;
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to->si_errno = from->si_errno;
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to->si_code = from->si_code;
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if (to->si_code < 0)
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{
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to->cpt_si_ptr = (intptr_t) from->si_ptr;
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}
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else if (to->si_code == SI_USER)
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{
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to->cpt_si_pid = from->si_pid;
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to->cpt_si_uid = from->si_uid;
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}
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else if (to->si_code == SI_TIMER)
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{
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to->cpt_si_timerid = from->si_timerid;
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to->cpt_si_overrun = from->si_overrun;
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to->cpt_si_ptr = (intptr_t) from->si_ptr;
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}
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else
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{
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switch (to->si_signo)
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{
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case SIGCHLD:
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to->cpt_si_pid = from->si_pid;
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to->cpt_si_uid = from->si_uid;
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to->cpt_si_status = from->si_status;
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to->cpt_si_utime = from->si_utime;
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to->cpt_si_stime = from->si_stime;
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break;
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case SIGILL:
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case SIGFPE:
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case SIGSEGV:
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case SIGBUS:
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to->cpt_si_addr = (intptr_t) from->si_addr;
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break;
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case SIGPOLL:
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to->cpt_si_band = from->si_band;
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to->cpt_si_fd = from->si_fd;
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break;
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default:
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to->cpt_si_pid = from->si_pid;
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to->cpt_si_uid = from->si_uid;
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to->cpt_si_ptr = (intptr_t) from->si_ptr;
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break;
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}
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}
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}
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static void
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siginfo_from_compat_siginfo (siginfo_t *to, compat_siginfo_t *from)
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{
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memset (to, 0, sizeof (*to));
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to->si_signo = from->si_signo;
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to->si_errno = from->si_errno;
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to->si_code = from->si_code;
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if (to->si_code < 0)
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{
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to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
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}
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else if (to->si_code == SI_USER)
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{
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to->si_pid = from->cpt_si_pid;
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to->si_uid = from->cpt_si_uid;
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}
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else if (to->si_code == SI_TIMER)
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{
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to->si_timerid = from->cpt_si_timerid;
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to->si_overrun = from->cpt_si_overrun;
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to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
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}
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else
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{
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switch (to->si_signo)
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{
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case SIGCHLD:
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to->si_pid = from->cpt_si_pid;
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to->si_uid = from->cpt_si_uid;
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to->si_status = from->cpt_si_status;
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to->si_utime = from->cpt_si_utime;
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to->si_stime = from->cpt_si_stime;
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break;
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case SIGILL:
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case SIGFPE:
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case SIGSEGV:
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case SIGBUS:
|
||
to->si_addr = (void *) (intptr_t) from->cpt_si_addr;
|
||
break;
|
||
case SIGPOLL:
|
||
to->si_band = from->cpt_si_band;
|
||
to->si_fd = from->cpt_si_fd;
|
||
break;
|
||
default:
|
||
to->si_pid = from->cpt_si_pid;
|
||
to->si_uid = from->cpt_si_uid;
|
||
to->si_ptr = (void* ) (intptr_t) from->cpt_si_ptr;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
#endif /* __x86_64__ */
|
||
|
||
/* Convert a native/host siginfo object, into/from the siginfo in the
|
||
layout of the inferiors' architecture. Returns true if any
|
||
conversion was done; false otherwise. If DIRECTION is 1, then copy
|
||
from INF to NATIVE. If DIRECTION is 0, copy from NATIVE to
|
||
INF. */
|
||
|
||
static int
|
||
x86_siginfo_fixup (struct siginfo *native, void *inf, int direction)
|
||
{
|
||
#ifdef __x86_64__
|
||
/* Is the inferior 32-bit? If so, then fixup the siginfo object. */
|
||
if (register_size (0) == 4)
|
||
{
|
||
if (sizeof (struct siginfo) != sizeof (compat_siginfo_t))
|
||
fatal ("unexpected difference in siginfo");
|
||
|
||
if (direction == 0)
|
||
compat_siginfo_from_siginfo ((struct compat_siginfo *) inf, native);
|
||
else
|
||
siginfo_from_compat_siginfo (native, (struct compat_siginfo *) inf);
|
||
|
||
return 1;
|
||
}
|
||
#endif
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Initialize gdbserver for the architecture of the inferior. */
|
||
|
||
static void
|
||
x86_arch_setup (void)
|
||
{
|
||
#ifdef __x86_64__
|
||
int pid = pid_of (get_thread_lwp (current_inferior));
|
||
char *file = linux_child_pid_to_exec_file (pid);
|
||
int use_64bit = elf_64_file_p (file);
|
||
|
||
free (file);
|
||
|
||
if (use_64bit < 0)
|
||
{
|
||
/* This can only happen if /proc/<pid>/exe is unreadable,
|
||
but "that can't happen" if we've gotten this far.
|
||
Fall through and assume this is a 32-bit program. */
|
||
}
|
||
else if (use_64bit)
|
||
{
|
||
init_registers_x86_64_linux ();
|
||
|
||
/* Amd64 doesn't have HAVE_LINUX_USRREGS. */
|
||
the_low_target.num_regs = -1;
|
||
the_low_target.regmap = NULL;
|
||
the_low_target.cannot_fetch_register = NULL;
|
||
the_low_target.cannot_store_register = NULL;
|
||
|
||
/* Amd64 has 16 xmm regs. */
|
||
num_xmm_registers = 16;
|
||
|
||
return;
|
||
}
|
||
#endif
|
||
|
||
/* Ok we have a 32-bit inferior. */
|
||
|
||
init_registers_i386_linux ();
|
||
|
||
the_low_target.num_regs = I386_NUM_REGS;
|
||
the_low_target.regmap = i386_regmap;
|
||
the_low_target.cannot_fetch_register = i386_cannot_fetch_register;
|
||
the_low_target.cannot_store_register = i386_cannot_store_register;
|
||
|
||
/* I386 has 8 xmm regs. */
|
||
num_xmm_registers = 8;
|
||
}
|
||
|
||
/* This is initialized assuming an amd64 target.
|
||
x86_arch_setup will correct it for i386 or amd64 targets. */
|
||
|
||
struct linux_target_ops the_low_target =
|
||
{
|
||
x86_arch_setup,
|
||
-1,
|
||
NULL,
|
||
NULL,
|
||
NULL,
|
||
x86_get_pc,
|
||
x86_set_pc,
|
||
x86_breakpoint,
|
||
x86_breakpoint_len,
|
||
NULL,
|
||
1,
|
||
x86_breakpoint_at,
|
||
NULL,
|
||
NULL,
|
||
NULL,
|
||
NULL,
|
||
/* collect_ptrace_register/supply_ptrace_register are not needed in the
|
||
native i386 case (no registers smaller than an xfer unit), and are not
|
||
used in the biarch case (HAVE_LINUX_USRREGS is not defined). */
|
||
NULL,
|
||
NULL,
|
||
/* need to fix up i386 siginfo if host is amd64 */
|
||
x86_siginfo_fixup,
|
||
};
|