1063 lines
25 KiB
C
1063 lines
25 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, 2010
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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 <stddef.h>
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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 "i386-low.h"
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#include "i386-xstate.h"
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#include "elf/common.h"
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#include "gdb_proc_service.h"
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/* Defined in auto-generated file i386-linux.c. */
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void init_registers_i386_linux (void);
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/* Defined in auto-generated file amd64-linux.c. */
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void init_registers_amd64_linux (void);
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/* Defined in auto-generated file i386-avx-linux.c. */
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void init_registers_i386_avx_linux (void);
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/* Defined in auto-generated file amd64-avx-linux.c. */
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void init_registers_amd64_avx_linux (void);
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/* Defined in auto-generated file i386-mmx-linux.c. */
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void init_registers_i386_mmx_linux (void);
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/* Backward compatibility for gdb without XML support. */
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static const char *xmltarget_i386_linux_no_xml = "@<target>\
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<architecture>i386</architecture>\
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<osabi>GNU/Linux</osabi>\
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</target>";
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static const char *xmltarget_amd64_linux_no_xml = "@<target>\
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<architecture>i386:x86-64</architecture>\
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<osabi>GNU/Linux</osabi>\
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</target>";
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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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#include <sys/uio.h>
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#ifndef PTRACE_GETREGSET
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#define PTRACE_GETREGSET 0x4204
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#endif
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#ifndef PTRACE_SETREGSET
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#define PTRACE_SETREGSET 0x4205
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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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/* 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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/* Per-process arch-specific data we want to keep. */
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struct arch_process_info
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{
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struct i386_debug_reg_state debug_reg_state;
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};
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/* Per-thread arch-specific data we want to keep. */
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struct arch_lwp_info
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{
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/* Non-zero if our copy differs from what's recorded in the thread. */
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int debug_registers_changed;
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};
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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 (struct regcache *regcache, 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 (regcache, 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 (regcache, i, ((char *) buf) + i386_regmap[i]);
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collect_register_by_name (regcache, "orig_eax",
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((char *) buf) + ORIG_EAX * 4);
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}
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static void
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x86_store_gregset (struct regcache *regcache, 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 (regcache, 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 (regcache, i, ((char *) buf) + i386_regmap[i]);
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supply_register_by_name (regcache, "orig_eax",
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((char *) buf) + ORIG_EAX * 4);
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}
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static void
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x86_fill_fpregset (struct regcache *regcache, void *buf)
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{
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#ifdef __x86_64__
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i387_cache_to_fxsave (regcache, buf);
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#else
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i387_cache_to_fsave (regcache, buf);
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#endif
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}
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static void
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x86_store_fpregset (struct regcache *regcache, const void *buf)
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{
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#ifdef __x86_64__
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i387_fxsave_to_cache (regcache, buf);
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#else
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i387_fsave_to_cache (regcache, 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 (struct regcache *regcache, void *buf)
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{
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i387_cache_to_fxsave (regcache, buf);
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}
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static void
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x86_store_fpxregset (struct regcache *regcache, const void *buf)
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{
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i387_fxsave_to_cache (regcache, buf);
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}
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#endif
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static void
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x86_fill_xstateregset (struct regcache *regcache, void *buf)
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{
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i387_cache_to_xsave (regcache, buf);
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}
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static void
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x86_store_xstateregset (struct regcache *regcache, const void *buf)
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{
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i387_xsave_to_cache (regcache, buf);
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}
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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, 0, sizeof (elf_gregset_t),
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GENERAL_REGS,
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x86_fill_gregset, x86_store_gregset },
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{ PTRACE_GETREGSET, PTRACE_SETREGSET, NT_X86_XSTATE, 0,
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EXTENDED_REGS, x86_fill_xstateregset, x86_store_xstateregset },
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# ifndef __x86_64__
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# ifdef HAVE_PTRACE_GETFPXREGS
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{ PTRACE_GETFPXREGS, PTRACE_SETFPXREGS, 0, 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, 0, 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, 0, -1, -1, NULL, NULL }
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};
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static CORE_ADDR
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x86_get_pc (struct regcache *regcache)
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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 (regcache, "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 (regcache, "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 (struct regcache *regcache, 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 (regcache, "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 (regcache, "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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||
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(*the_target->read_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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/* Support for debug registers. */
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||
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static unsigned long
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x86_linux_dr_get (ptid_t ptid, int regnum)
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{
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||
int tid;
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unsigned long value;
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||
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tid = ptid_get_lwp (ptid);
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||
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errno = 0;
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value = ptrace (PTRACE_PEEKUSER, tid,
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offsetof (struct user, u_debugreg[regnum]), 0);
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if (errno != 0)
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error ("Couldn't read debug register");
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||
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return value;
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||
}
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||
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static void
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x86_linux_dr_set (ptid_t ptid, int regnum, unsigned long value)
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{
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int tid;
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tid = ptid_get_lwp (ptid);
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errno = 0;
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ptrace (PTRACE_POKEUSER, tid,
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offsetof (struct user, u_debugreg[regnum]), value);
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||
if (errno != 0)
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||
error ("Couldn't write debug register");
|
||
}
|
||
|
||
/* Update the inferior's debug register REGNUM from STATE. */
|
||
|
||
void
|
||
i386_dr_low_set_addr (const struct i386_debug_reg_state *state, int regnum)
|
||
{
|
||
struct inferior_list_entry *lp;
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||
CORE_ADDR addr;
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||
/* Only need to update the threads of this process. */
|
||
int pid = pid_of (get_thread_lwp (current_inferior));
|
||
|
||
if (! (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR))
|
||
fatal ("Invalid debug register %d", regnum);
|
||
|
||
addr = state->dr_mirror[regnum];
|
||
|
||
for (lp = all_lwps.head; lp; lp = lp->next)
|
||
{
|
||
struct lwp_info *lwp = (struct lwp_info *) lp;
|
||
|
||
/* The actual update is done later, we just mark that the register
|
||
needs updating. */
|
||
if (pid_of (lwp) == pid)
|
||
lwp->arch_private->debug_registers_changed = 1;
|
||
}
|
||
}
|
||
|
||
/* Update the inferior's DR7 debug control register from STATE. */
|
||
|
||
void
|
||
i386_dr_low_set_control (const struct i386_debug_reg_state *state)
|
||
{
|
||
struct inferior_list_entry *lp;
|
||
/* Only need to update the threads of this process. */
|
||
int pid = pid_of (get_thread_lwp (current_inferior));
|
||
|
||
for (lp = all_lwps.head; lp; lp = lp->next)
|
||
{
|
||
struct lwp_info *lwp = (struct lwp_info *) lp;
|
||
|
||
/* The actual update is done later, we just mark that the register
|
||
needs updating. */
|
||
if (pid_of (lwp) == pid)
|
||
lwp->arch_private->debug_registers_changed = 1;
|
||
}
|
||
}
|
||
|
||
/* Get the value of the DR6 debug status register from the inferior
|
||
and record it in STATE. */
|
||
|
||
void
|
||
i386_dr_low_get_status (struct i386_debug_reg_state *state)
|
||
{
|
||
struct lwp_info *lwp = get_thread_lwp (current_inferior);
|
||
ptid_t ptid = ptid_of (lwp);
|
||
|
||
state->dr_status_mirror = x86_linux_dr_get (ptid, DR_STATUS);
|
||
}
|
||
|
||
/* Watchpoint support. */
|
||
|
||
static int
|
||
x86_insert_point (char type, CORE_ADDR addr, int len)
|
||
{
|
||
struct process_info *proc = current_process ();
|
||
switch (type)
|
||
{
|
||
case '0':
|
||
return set_gdb_breakpoint_at (addr);
|
||
case '2':
|
||
case '3':
|
||
case '4':
|
||
return i386_low_insert_watchpoint (&proc->private->arch_private->debug_reg_state,
|
||
type, addr, len);
|
||
default:
|
||
/* Unsupported. */
|
||
return 1;
|
||
}
|
||
}
|
||
|
||
static int
|
||
x86_remove_point (char type, CORE_ADDR addr, int len)
|
||
{
|
||
struct process_info *proc = current_process ();
|
||
switch (type)
|
||
{
|
||
case '0':
|
||
return delete_gdb_breakpoint_at (addr);
|
||
case '2':
|
||
case '3':
|
||
case '4':
|
||
return i386_low_remove_watchpoint (&proc->private->arch_private->debug_reg_state,
|
||
type, addr, len);
|
||
default:
|
||
/* Unsupported. */
|
||
return 1;
|
||
}
|
||
}
|
||
|
||
static int
|
||
x86_stopped_by_watchpoint (void)
|
||
{
|
||
struct process_info *proc = current_process ();
|
||
return i386_low_stopped_by_watchpoint (&proc->private->arch_private->debug_reg_state);
|
||
}
|
||
|
||
static CORE_ADDR
|
||
x86_stopped_data_address (void)
|
||
{
|
||
struct process_info *proc = current_process ();
|
||
CORE_ADDR addr;
|
||
if (i386_low_stopped_data_address (&proc->private->arch_private->debug_reg_state,
|
||
&addr))
|
||
return addr;
|
||
return 0;
|
||
}
|
||
|
||
/* Called when a new process is created. */
|
||
|
||
static struct arch_process_info *
|
||
x86_linux_new_process (void)
|
||
{
|
||
struct arch_process_info *info = xcalloc (1, sizeof (*info));
|
||
|
||
i386_low_init_dregs (&info->debug_reg_state);
|
||
|
||
return info;
|
||
}
|
||
|
||
/* Called when a new thread is detected. */
|
||
|
||
static struct arch_lwp_info *
|
||
x86_linux_new_thread (void)
|
||
{
|
||
struct arch_lwp_info *info = xcalloc (1, sizeof (*info));
|
||
|
||
info->debug_registers_changed = 1;
|
||
|
||
return info;
|
||
}
|
||
|
||
/* Called when resuming a thread.
|
||
If the debug regs have changed, update the thread's copies. */
|
||
|
||
static void
|
||
x86_linux_prepare_to_resume (struct lwp_info *lwp)
|
||
{
|
||
ptid_t ptid = ptid_of (lwp);
|
||
|
||
if (lwp->arch_private->debug_registers_changed)
|
||
{
|
||
int i;
|
||
int pid = ptid_get_pid (ptid);
|
||
struct process_info *proc = find_process_pid (pid);
|
||
struct i386_debug_reg_state *state = &proc->private->arch_private->debug_reg_state;
|
||
|
||
for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
|
||
x86_linux_dr_set (ptid, i, state->dr_mirror[i]);
|
||
|
||
x86_linux_dr_set (ptid, DR_CONTROL, state->dr_control_mirror);
|
||
|
||
lwp->arch_private->debug_registers_changed = 0;
|
||
}
|
||
|
||
if (lwp->stopped_by_watchpoint)
|
||
x86_linux_dr_set (ptid, DR_STATUS, 0);
|
||
}
|
||
|
||
/* When GDBSERVER is built as a 64-bit application on linux, the
|
||
PTRACE_GETSIGINFO data is always presented in 64-bit layout. Since
|
||
debugging a 32-bit inferior with a 64-bit GDBSERVER should look the same
|
||
as debugging it with a 32-bit GDBSERVER, we do the 32-bit <-> 64-bit
|
||
conversion in-place ourselves. */
|
||
|
||
/* These types below (compat_*) define a siginfo type that is layout
|
||
compatible with the siginfo type exported by the 32-bit userspace
|
||
support. */
|
||
|
||
#ifdef __x86_64__
|
||
|
||
typedef int compat_int_t;
|
||
typedef unsigned int compat_uptr_t;
|
||
|
||
typedef int compat_time_t;
|
||
typedef int compat_timer_t;
|
||
typedef int compat_clock_t;
|
||
|
||
struct compat_timeval
|
||
{
|
||
compat_time_t tv_sec;
|
||
int tv_usec;
|
||
};
|
||
|
||
typedef union compat_sigval
|
||
{
|
||
compat_int_t sival_int;
|
||
compat_uptr_t sival_ptr;
|
||
} compat_sigval_t;
|
||
|
||
typedef struct compat_siginfo
|
||
{
|
||
int si_signo;
|
||
int si_errno;
|
||
int si_code;
|
||
|
||
union
|
||
{
|
||
int _pad[((128 / sizeof (int)) - 3)];
|
||
|
||
/* kill() */
|
||
struct
|
||
{
|
||
unsigned int _pid;
|
||
unsigned int _uid;
|
||
} _kill;
|
||
|
||
/* POSIX.1b timers */
|
||
struct
|
||
{
|
||
compat_timer_t _tid;
|
||
int _overrun;
|
||
compat_sigval_t _sigval;
|
||
} _timer;
|
||
|
||
/* POSIX.1b signals */
|
||
struct
|
||
{
|
||
unsigned int _pid;
|
||
unsigned int _uid;
|
||
compat_sigval_t _sigval;
|
||
} _rt;
|
||
|
||
/* SIGCHLD */
|
||
struct
|
||
{
|
||
unsigned int _pid;
|
||
unsigned int _uid;
|
||
int _status;
|
||
compat_clock_t _utime;
|
||
compat_clock_t _stime;
|
||
} _sigchld;
|
||
|
||
/* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
|
||
struct
|
||
{
|
||
unsigned int _addr;
|
||
} _sigfault;
|
||
|
||
/* SIGPOLL */
|
||
struct
|
||
{
|
||
int _band;
|
||
int _fd;
|
||
} _sigpoll;
|
||
} _sifields;
|
||
} compat_siginfo_t;
|
||
|
||
#define cpt_si_pid _sifields._kill._pid
|
||
#define cpt_si_uid _sifields._kill._uid
|
||
#define cpt_si_timerid _sifields._timer._tid
|
||
#define cpt_si_overrun _sifields._timer._overrun
|
||
#define cpt_si_status _sifields._sigchld._status
|
||
#define cpt_si_utime _sifields._sigchld._utime
|
||
#define cpt_si_stime _sifields._sigchld._stime
|
||
#define cpt_si_ptr _sifields._rt._sigval.sival_ptr
|
||
#define cpt_si_addr _sifields._sigfault._addr
|
||
#define cpt_si_band _sifields._sigpoll._band
|
||
#define cpt_si_fd _sifields._sigpoll._fd
|
||
|
||
/* glibc at least up to 2.3.2 doesn't have si_timerid, si_overrun.
|
||
In their place is si_timer1,si_timer2. */
|
||
#ifndef si_timerid
|
||
#define si_timerid si_timer1
|
||
#endif
|
||
#ifndef si_overrun
|
||
#define si_overrun si_timer2
|
||
#endif
|
||
|
||
static void
|
||
compat_siginfo_from_siginfo (compat_siginfo_t *to, siginfo_t *from)
|
||
{
|
||
memset (to, 0, sizeof (*to));
|
||
|
||
to->si_signo = from->si_signo;
|
||
to->si_errno = from->si_errno;
|
||
to->si_code = from->si_code;
|
||
|
||
if (to->si_code < 0)
|
||
{
|
||
to->cpt_si_ptr = (intptr_t) from->si_ptr;
|
||
}
|
||
else if (to->si_code == SI_USER)
|
||
{
|
||
to->cpt_si_pid = from->si_pid;
|
||
to->cpt_si_uid = from->si_uid;
|
||
}
|
||
else if (to->si_code == SI_TIMER)
|
||
{
|
||
to->cpt_si_timerid = from->si_timerid;
|
||
to->cpt_si_overrun = from->si_overrun;
|
||
to->cpt_si_ptr = (intptr_t) from->si_ptr;
|
||
}
|
||
else
|
||
{
|
||
switch (to->si_signo)
|
||
{
|
||
case SIGCHLD:
|
||
to->cpt_si_pid = from->si_pid;
|
||
to->cpt_si_uid = from->si_uid;
|
||
to->cpt_si_status = from->si_status;
|
||
to->cpt_si_utime = from->si_utime;
|
||
to->cpt_si_stime = from->si_stime;
|
||
break;
|
||
case SIGILL:
|
||
case SIGFPE:
|
||
case SIGSEGV:
|
||
case SIGBUS:
|
||
to->cpt_si_addr = (intptr_t) from->si_addr;
|
||
break;
|
||
case SIGPOLL:
|
||
to->cpt_si_band = from->si_band;
|
||
to->cpt_si_fd = from->si_fd;
|
||
break;
|
||
default:
|
||
to->cpt_si_pid = from->si_pid;
|
||
to->cpt_si_uid = from->si_uid;
|
||
to->cpt_si_ptr = (intptr_t) from->si_ptr;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
static void
|
||
siginfo_from_compat_siginfo (siginfo_t *to, compat_siginfo_t *from)
|
||
{
|
||
memset (to, 0, sizeof (*to));
|
||
|
||
to->si_signo = from->si_signo;
|
||
to->si_errno = from->si_errno;
|
||
to->si_code = from->si_code;
|
||
|
||
if (to->si_code < 0)
|
||
{
|
||
to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
|
||
}
|
||
else if (to->si_code == SI_USER)
|
||
{
|
||
to->si_pid = from->cpt_si_pid;
|
||
to->si_uid = from->cpt_si_uid;
|
||
}
|
||
else if (to->si_code == SI_TIMER)
|
||
{
|
||
to->si_timerid = from->cpt_si_timerid;
|
||
to->si_overrun = from->cpt_si_overrun;
|
||
to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
|
||
}
|
||
else
|
||
{
|
||
switch (to->si_signo)
|
||
{
|
||
case SIGCHLD:
|
||
to->si_pid = from->cpt_si_pid;
|
||
to->si_uid = from->cpt_si_uid;
|
||
to->si_status = from->cpt_si_status;
|
||
to->si_utime = from->cpt_si_utime;
|
||
to->si_stime = from->cpt_si_stime;
|
||
break;
|
||
case SIGILL:
|
||
case SIGFPE:
|
||
case SIGSEGV:
|
||
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;
|
||
}
|
||
|
||
static int use_xml;
|
||
|
||
/* Update gdbserver_xmltarget. */
|
||
|
||
static void
|
||
x86_linux_update_xmltarget (void)
|
||
{
|
||
int pid;
|
||
struct regset_info *regset;
|
||
static unsigned long long xcr0;
|
||
static int have_ptrace_getregset = -1;
|
||
#ifdef HAVE_PTRACE_GETFPXREGS
|
||
static int have_ptrace_getfpxregs = -1;
|
||
#endif
|
||
|
||
if (!current_inferior)
|
||
return;
|
||
|
||
pid = pid_of (get_thread_lwp (current_inferior));
|
||
#ifdef __x86_64__
|
||
if (num_xmm_registers == 8)
|
||
init_registers_i386_linux ();
|
||
else
|
||
init_registers_amd64_linux ();
|
||
#else
|
||
{
|
||
# ifdef HAVE_PTRACE_GETFPXREGS
|
||
if (have_ptrace_getfpxregs == -1)
|
||
{
|
||
elf_fpxregset_t fpxregs;
|
||
|
||
if (ptrace (PTRACE_GETFPXREGS, pid, 0, (int) &fpxregs) < 0)
|
||
{
|
||
have_ptrace_getfpxregs = 0;
|
||
x86_xcr0 = I386_XSTATE_X87_MASK;
|
||
|
||
/* Disable PTRACE_GETFPXREGS. */
|
||
for (regset = target_regsets;
|
||
regset->fill_function != NULL; regset++)
|
||
if (regset->get_request == PTRACE_GETFPXREGS)
|
||
{
|
||
regset->size = 0;
|
||
break;
|
||
}
|
||
}
|
||
else
|
||
have_ptrace_getfpxregs = 1;
|
||
}
|
||
|
||
if (!have_ptrace_getfpxregs)
|
||
{
|
||
init_registers_i386_mmx_linux ();
|
||
return;
|
||
}
|
||
# endif
|
||
init_registers_i386_linux ();
|
||
}
|
||
#endif
|
||
|
||
if (!use_xml)
|
||
{
|
||
/* Don't use XML. */
|
||
#ifdef __x86_64__
|
||
if (num_xmm_registers == 8)
|
||
gdbserver_xmltarget = xmltarget_i386_linux_no_xml;
|
||
else
|
||
gdbserver_xmltarget = xmltarget_amd64_linux_no_xml;
|
||
#else
|
||
gdbserver_xmltarget = xmltarget_i386_linux_no_xml;
|
||
#endif
|
||
|
||
x86_xcr0 = I386_XSTATE_SSE_MASK;
|
||
|
||
return;
|
||
}
|
||
|
||
/* Check if XSAVE extended state is supported. */
|
||
if (have_ptrace_getregset == -1)
|
||
{
|
||
unsigned long long xstateregs[I386_XSTATE_SSE_SIZE / sizeof (long long)];
|
||
struct iovec iov;
|
||
|
||
iov.iov_base = xstateregs;
|
||
iov.iov_len = sizeof (xstateregs);
|
||
|
||
/* Check if PTRACE_GETREGSET works. */
|
||
if (ptrace (PTRACE_GETREGSET, pid, (unsigned int) NT_X86_XSTATE,
|
||
&iov) < 0)
|
||
{
|
||
have_ptrace_getregset = 0;
|
||
return;
|
||
}
|
||
else
|
||
have_ptrace_getregset = 1;
|
||
|
||
/* Get XCR0 from XSAVE extended state at byte 464. */
|
||
xcr0 = xstateregs[464 / sizeof (long long)];
|
||
|
||
/* Use PTRACE_GETREGSET if it is available. */
|
||
for (regset = target_regsets;
|
||
regset->fill_function != NULL; regset++)
|
||
if (regset->get_request == PTRACE_GETREGSET)
|
||
regset->size = I386_XSTATE_SIZE (xcr0);
|
||
else if (regset->type != GENERAL_REGS)
|
||
regset->size = 0;
|
||
}
|
||
|
||
if (have_ptrace_getregset)
|
||
{
|
||
/* AVX is the highest feature we support. */
|
||
if ((xcr0 & I386_XSTATE_AVX_MASK) == I386_XSTATE_AVX_MASK)
|
||
{
|
||
x86_xcr0 = xcr0;
|
||
|
||
#ifdef __x86_64__
|
||
/* I386 has 8 xmm regs. */
|
||
if (num_xmm_registers == 8)
|
||
init_registers_i386_avx_linux ();
|
||
else
|
||
init_registers_amd64_avx_linux ();
|
||
#else
|
||
init_registers_i386_avx_linux ();
|
||
#endif
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Process qSupported query, "xmlRegisters=". Update the buffer size for
|
||
PTRACE_GETREGSET. */
|
||
|
||
static void
|
||
x86_linux_process_qsupported (const char *query)
|
||
{
|
||
/* Return if gdb doesn't support XML. If gdb sends "xmlRegisters="
|
||
with "i386" in qSupported query, it supports x86 XML target
|
||
descriptions. */
|
||
use_xml = 0;
|
||
if (query != NULL && strncmp (query, "xmlRegisters=", 13) == 0)
|
||
{
|
||
char *copy = xstrdup (query + 13);
|
||
char *p;
|
||
|
||
for (p = strtok (copy, ","); p != NULL; p = strtok (NULL, ","))
|
||
{
|
||
if (strcmp (p, "i386") == 0)
|
||
{
|
||
use_xml = 1;
|
||
break;
|
||
}
|
||
}
|
||
|
||
free (copy);
|
||
}
|
||
|
||
x86_linux_update_xmltarget ();
|
||
}
|
||
|
||
/* 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)
|
||
{
|
||
/* 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;
|
||
|
||
x86_linux_update_xmltarget ();
|
||
return;
|
||
}
|
||
#endif
|
||
|
||
/* Ok we have a 32-bit inferior. */
|
||
|
||
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;
|
||
|
||
x86_linux_update_xmltarget ();
|
||
}
|
||
|
||
/* 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,
|
||
x86_insert_point,
|
||
x86_remove_point,
|
||
x86_stopped_by_watchpoint,
|
||
x86_stopped_data_address,
|
||
/* 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,
|
||
x86_linux_new_process,
|
||
x86_linux_new_thread,
|
||
x86_linux_prepare_to_resume,
|
||
x86_linux_process_qsupported
|
||
};
|