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438 lines
12 KiB
C
438 lines
12 KiB
C
/* Native-dependent code for GNU/Linux x86-64.
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Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
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Free Software Foundation, Inc.
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Contributed by Jiri Smid, SuSE Labs.
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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 "defs.h"
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#include "inferior.h"
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#include "gdbcore.h"
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#include "regcache.h"
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#include "linux-nat.h"
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#include "amd64-linux-tdep.h"
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#include "gdb_assert.h"
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#include "gdb_string.h"
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#include <sys/ptrace.h>
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#include <sys/debugreg.h>
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#include <sys/syscall.h>
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#include <sys/procfs.h>
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#include <asm/prctl.h>
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/* FIXME ezannoni-2003-07-09: we need <sys/reg.h> to be included after
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<asm/ptrace.h> because the latter redefines FS and GS for no apparent
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reason, and those definitions don't match the ones that libpthread_db
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uses, which come from <sys/reg.h>. */
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/* ezannoni-2003-07-09: I think this is fixed. The extraneous defs have
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been removed from ptrace.h in the kernel. However, better safe than
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sorry. */
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#include <asm/ptrace.h>
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#include <sys/reg.h>
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#include "gdb_proc_service.h"
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/* Prototypes for supply_gregset etc. */
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#include "gregset.h"
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#include "amd64-tdep.h"
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#include "i386-linux-tdep.h"
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#include "amd64-nat.h"
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/* Mapping between the general-purpose registers in GNU/Linux x86-64
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`struct user' format and GDB's register cache layout. */
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static int amd64_linux_gregset64_reg_offset[] =
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{
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RAX * 8, RBX * 8, /* %rax, %rbx */
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RCX * 8, RDX * 8, /* %rcx, %rdx */
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RSI * 8, RDI * 8, /* %rsi, %rdi */
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RBP * 8, RSP * 8, /* %rbp, %rsp */
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R8 * 8, R9 * 8, /* %r8 ... */
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R10 * 8, R11 * 8,
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R12 * 8, R13 * 8,
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R14 * 8, R15 * 8, /* ... %r15 */
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RIP * 8, EFLAGS * 8, /* %rip, %eflags */
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CS * 8, SS * 8, /* %cs, %ss */
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DS * 8, ES * 8, /* %ds, %es */
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FS * 8, GS * 8, /* %fs, %gs */
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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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/* Mapping between the general-purpose registers in GNU/Linux x86-64
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`struct user' format and GDB's register cache layout for GNU/Linux
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i386.
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Note that most GNU/Linux x86-64 registers are 64-bit, while the
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GNU/Linux i386 registers are all 32-bit, but since we're
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little-endian we get away with that. */
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/* From <sys/reg.h> on GNU/Linux i386. */
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static int amd64_linux_gregset32_reg_offset[] =
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{
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RAX * 8, RCX * 8, /* %eax, %ecx */
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RDX * 8, RBX * 8, /* %edx, %ebx */
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RSP * 8, RBP * 8, /* %esp, %ebp */
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RSI * 8, RDI * 8, /* %esi, %edi */
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RIP * 8, EFLAGS * 8, /* %eip, %eflags */
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CS * 8, SS * 8, /* %cs, %ss */
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DS * 8, ES * 8, /* %ds, %es */
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FS * 8, GS * 8, /* %fs, %gs */
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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 /* "orig_eax" */
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};
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/* Transfering the general-purpose registers between GDB, inferiors
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and core files. */
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/* Fill GDB's register cache with the general-purpose register values
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in *GREGSETP. */
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void
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supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp)
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{
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amd64_supply_native_gregset (regcache, gregsetp, -1);
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}
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/* Fill register REGNUM (if it is a general-purpose register) in
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*GREGSETP with the value in GDB's register cache. If REGNUM is -1,
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do this for all registers. */
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void
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fill_gregset (const struct regcache *regcache,
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elf_gregset_t *gregsetp, int regnum)
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{
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amd64_collect_native_gregset (regcache, gregsetp, regnum);
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}
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/* Transfering floating-point registers between GDB, inferiors and cores. */
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/* Fill GDB's register cache with the floating-point and SSE register
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values in *FPREGSETP. */
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void
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supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp)
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{
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amd64_supply_fxsave (regcache, -1, fpregsetp);
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}
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/* Fill register REGNUM (if it is a floating-point or SSE register) in
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*FPREGSETP with the value in GDB's register cache. If REGNUM is
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-1, do this for all registers. */
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void
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fill_fpregset (const struct regcache *regcache,
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elf_fpregset_t *fpregsetp, int regnum)
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{
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amd64_collect_fxsave (regcache, regnum, fpregsetp);
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}
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/* Transferring arbitrary registers between GDB and inferior. */
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/* Fetch register REGNUM from the child process. If REGNUM is -1, do
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this for all registers (including the floating point and SSE
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registers). */
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static void
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amd64_linux_fetch_inferior_registers (struct regcache *regcache, int regnum)
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{
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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int tid;
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/* GNU/Linux LWP ID's are process ID's. */
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tid = TIDGET (inferior_ptid);
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if (tid == 0)
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tid = PIDGET (inferior_ptid); /* Not a threaded program. */
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if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
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{
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elf_gregset_t regs;
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if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0)
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perror_with_name (_("Couldn't get registers"));
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amd64_supply_native_gregset (regcache, ®s, -1);
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if (regnum != -1)
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return;
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}
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if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
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{
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elf_fpregset_t fpregs;
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if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0)
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perror_with_name (_("Couldn't get floating point status"));
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amd64_supply_fxsave (regcache, -1, &fpregs);
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}
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}
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/* Store register REGNUM back into the child process. If REGNUM is
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-1, do this for all registers (including the floating-point and SSE
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registers). */
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static void
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amd64_linux_store_inferior_registers (struct regcache *regcache, int regnum)
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{
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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int tid;
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/* GNU/Linux LWP ID's are process ID's. */
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tid = TIDGET (inferior_ptid);
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if (tid == 0)
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tid = PIDGET (inferior_ptid); /* Not a threaded program. */
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if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
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{
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elf_gregset_t regs;
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if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0)
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perror_with_name (_("Couldn't get registers"));
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amd64_collect_native_gregset (regcache, ®s, regnum);
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if (ptrace (PTRACE_SETREGS, tid, 0, (long) ®s) < 0)
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perror_with_name (_("Couldn't write registers"));
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if (regnum != -1)
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return;
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}
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if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
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{
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elf_fpregset_t fpregs;
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if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0)
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perror_with_name (_("Couldn't get floating point status"));
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amd64_collect_fxsave (regcache, regnum, &fpregs);
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if (ptrace (PTRACE_SETFPREGS, tid, 0, (long) &fpregs) < 0)
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perror_with_name (_("Couldn't write floating point status"));
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return;
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}
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}
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/* Support for debug registers. */
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static unsigned long amd64_linux_dr[DR_CONTROL + 1];
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static unsigned long
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amd64_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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tid = TIDGET (ptid);
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if (tid == 0)
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tid = PIDGET (ptid);
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/* FIXME: kettenis/2001-03-27: Calling perror_with_name if the
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ptrace call fails breaks debugging remote targets. The correct
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way to fix this is to add the hardware breakpoint and watchpoint
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stuff to the target vector. For now, just return zero if the
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ptrace call fails. */
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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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#if 0
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perror_with_name (_("Couldn't read debug register"));
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#else
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return 0;
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#endif
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return value;
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}
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static void
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amd64_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 = TIDGET (ptid);
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if (tid == 0)
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tid = PIDGET (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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perror_with_name (_("Couldn't write debug register"));
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}
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void
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amd64_linux_dr_set_control (unsigned long control)
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{
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struct lwp_info *lp;
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ptid_t ptid;
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amd64_linux_dr[DR_CONTROL] = control;
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ALL_LWPS (lp, ptid)
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amd64_linux_dr_set (ptid, DR_CONTROL, control);
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}
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void
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amd64_linux_dr_set_addr (int regnum, CORE_ADDR addr)
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{
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struct lwp_info *lp;
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ptid_t ptid;
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gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
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amd64_linux_dr[DR_FIRSTADDR + regnum] = addr;
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ALL_LWPS (lp, ptid)
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amd64_linux_dr_set (ptid, DR_FIRSTADDR + regnum, addr);
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}
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void
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amd64_linux_dr_reset_addr (int regnum)
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{
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amd64_linux_dr_set_addr (regnum, 0);
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}
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unsigned long
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amd64_linux_dr_get_status (void)
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{
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return amd64_linux_dr_get (inferior_ptid, DR_STATUS);
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}
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static void
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amd64_linux_new_thread (ptid_t ptid)
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{
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int i;
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for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
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amd64_linux_dr_set (ptid, i, amd64_linux_dr[i]);
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amd64_linux_dr_set (ptid, DR_CONTROL, amd64_linux_dr[DR_CONTROL]);
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}
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/* This function is called by libthread_db as part of its handling of
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a request for a thread's local storage address. */
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ps_err_e
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ps_get_thread_area (const struct ps_prochandle *ph,
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lwpid_t lwpid, int idx, void **base)
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{
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if (gdbarch_ptr_bit (current_gdbarch) == 32)
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{
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/* The full structure is found in <asm-i386/ldt.h>. The second
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integer is the LDT's base_address and that is used to locate
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the thread's local storage. See i386-linux-nat.c more
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info. */
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unsigned int desc[4];
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/* This code assumes that "int" is 32 bits and that
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GET_THREAD_AREA returns no more than 4 int values. */
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gdb_assert (sizeof (int) == 4);
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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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if (ptrace (PTRACE_GET_THREAD_AREA,
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lwpid, (void *) (long) idx, (unsigned long) &desc) < 0)
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return PS_ERR;
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/* Extend the value to 64 bits. Here it's assumed that a "long"
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and a "void *" are the same. */
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(*base) = (void *) (long) desc[1];
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return PS_OK;
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}
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else
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{
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/* This definition comes from prctl.h, but some kernels may not
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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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/* FIXME: ezannoni-2003-07-09 see comment above about include
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file order. We could be getting bogus values for these two. */
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gdb_assert (FS < ELF_NGREG);
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gdb_assert (GS < ELF_NGREG);
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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: /* Should not happen. */
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return PS_BADADDR;
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}
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}
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return PS_ERR; /* ptrace failed. */
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}
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static void (*super_post_startup_inferior) (ptid_t ptid);
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static void
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amd64_linux_child_post_startup_inferior (ptid_t ptid)
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{
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i386_cleanup_dregs ();
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super_post_startup_inferior (ptid);
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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void _initialize_amd64_linux_nat (void);
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void
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_initialize_amd64_linux_nat (void)
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{
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struct target_ops *t;
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amd64_native_gregset32_reg_offset = amd64_linux_gregset32_reg_offset;
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amd64_native_gregset32_num_regs = I386_LINUX_NUM_REGS;
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amd64_native_gregset64_reg_offset = amd64_linux_gregset64_reg_offset;
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amd64_native_gregset64_num_regs = AMD64_LINUX_NUM_REGS;
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gdb_assert (ARRAY_SIZE (amd64_linux_gregset32_reg_offset)
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== amd64_native_gregset32_num_regs);
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gdb_assert (ARRAY_SIZE (amd64_linux_gregset64_reg_offset)
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== amd64_native_gregset64_num_regs);
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/* Fill in the generic GNU/Linux methods. */
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t = linux_target ();
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i386_use_watchpoints (t);
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/* Override the GNU/Linux inferior startup hook. */
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super_post_startup_inferior = t->to_post_startup_inferior;
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t->to_post_startup_inferior = amd64_linux_child_post_startup_inferior;
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/* Add our register access methods. */
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t->to_fetch_registers = amd64_linux_fetch_inferior_registers;
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t->to_store_registers = amd64_linux_store_inferior_registers;
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/* Register the target. */
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linux_nat_add_target (t);
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linux_nat_set_new_thread (t, amd64_linux_new_thread);
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}
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