5bca7895b7
Only define PTRACE_GET_THREAD_AREA is not already defined. Various style fixes in code and comments and some additional spelling fixes in comments. Move after functions dealing with debug registers. * x86-64-linux-nat.c (ps_get_thread_area): Don't define as extern. Fix coding-style.
405 lines
11 KiB
C
405 lines
11 KiB
C
/* Native-dependent code for GNU/Linux x86-64.
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Copyright 2001, 2002, 2003 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 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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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 "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 "x86-64-tdep.h"
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#include "x86-64-linux-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 x86_64_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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DS * 8, ES * 8, /* %ds, %es */
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FS * 8, GS * 8 /* %fs, %gs */
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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 x86_64_linux_gregset32_reg_offset[] =
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{
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10 * 8, 11 * 8, /* %eax, %ecx */
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12 * 8, 13 * 8, /* %edx, %ebx */
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19 * 8, 4 * 8, /* %esp, %ebp */
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13 * 8, 14 * 8, /* %esi, %edi */
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16 * 8, 18 * 8, /* %eip, %eflags */
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17 * 8, 20 * 8, /* %cs, %ss */
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23 * 8, 24 * 8, /* %ds, %es */
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25 * 4, 26 * 4, /* %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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15 * 8 /* "orig_eax" */
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};
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/* Which ptrace request retrieves which registers?
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These apply to the corresponding SET requests as well. */
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#define GETFPREGS_SUPPLIES(regno) \
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(FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM)
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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 (elf_gregset_t *gregsetp)
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{
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amd64_supply_native_gregset (current_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 (elf_gregset_t *gregsetp, int regnum)
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{
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amd64_collect_native_gregset (current_regcache, gregsetp, regnum);
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}
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/* Fetch all general-purpose registers from process/thread TID and
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store their values in GDB's register cache. */
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static void
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fetch_regs (int tid)
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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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supply_gregset (®s);
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}
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/* Store all valid general-purpose registers in GDB's register cache
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into the process/thread specified by TID. */
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static void
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store_regs (int tid, int 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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fill_gregset (®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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}
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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 (elf_fpregset_t *fpregsetp)
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{
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x86_64_supply_fxsave ((const char *) fpregsetp, -1);
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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 (elf_fpregset_t *fpregsetp, int regnum)
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{
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x86_64_fill_fxsave ((char *) fpregsetp, regnum);
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}
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/* Fetch all floating-point registers from process/thread TID and store
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thier values in GDB's register cache. */
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static void
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fetch_fpregs (int tid)
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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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supply_fpregset (&fpregs);
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}
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/* Store all valid floating-point registers in GDB's register cache
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into the process/thread specified by TID. */
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static void
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store_fpregs (int tid, int 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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fill_fpregset (&fpregs, regnum);
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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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}
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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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void
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fetch_inferior_registers (int regnum)
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{
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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 (regnum))
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{
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fetch_regs (tid);
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if (regnum != -1)
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return;
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}
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if (regnum == -1 || GETFPREGS_SUPPLIES (regnum))
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{
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fetch_fpregs (tid);
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return;
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}
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internal_error (__FILE__, __LINE__,
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"Got request for bad register number %d.", regnum);
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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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void
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store_inferior_registers (int regnum)
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{
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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 (regnum))
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{
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store_regs (tid, regnum);
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if (regnum != -1)
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return;
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}
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if (regnum == -1 || GETFPREGS_SUPPLIES (regnum))
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{
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store_fpregs (tid, regnum);
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return;
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}
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internal_error (__FILE__, __LINE__,
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"Got request to store bad register number %d.", regnum);
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}
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static unsigned long
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x86_64_linux_dr_get (int regnum)
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{
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int tid;
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unsigned long value;
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/* FIXME: kettenis/2001-01-29: It's not clear what we should do with
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multi-threaded processes here. For now, pretend there is just
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one thread. */
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tid = PIDGET (inferior_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 vectore. 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 (PT_READ_U, 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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x86_64_linux_dr_set (int regnum, unsigned long value)
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{
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int tid;
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/* FIXME: kettenis/2001-01-29: It's not clear what we should do with
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multi-threaded processes here. For now, pretend there is just
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one thread. */
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tid = PIDGET (inferior_ptid);
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errno = 0;
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ptrace (PT_WRITE_U, tid, 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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x86_64_linux_dr_set_control (unsigned long control)
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{
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x86_64_linux_dr_set (DR_CONTROL, control);
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}
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void
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x86_64_linux_dr_set_addr (int regnum, CORE_ADDR addr)
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{
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gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
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x86_64_linux_dr_set (DR_FIRSTADDR + regnum, addr);
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}
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void
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x86_64_linux_dr_reset_addr (int regnum)
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{
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gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
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x86_64_linux_dr_set (DR_FIRSTADDR + regnum, 0L);
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}
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unsigned long
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x86_64_linux_dr_get_status (void)
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{
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return x86_64_linux_dr_get (DR_STATUS);
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}
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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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/* 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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/* FIXME: ezannoni-2003-07-09 see comment above about include file order.
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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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return PS_ERR; /* ptrace failed. */
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}
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void
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child_post_startup_inferior (ptid_t ptid)
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{
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i386_cleanup_dregs ();
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linux_child_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_x86_64_linux_nat (void);
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void
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_initialize_x86_64_linux_nat (void)
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{
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amd64_native_gregset32_reg_offset = x86_64_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 = x86_64_linux_gregset64_reg_offset;
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gdb_assert (ARRAY_SIZE (x86_64_linux_gregset32_reg_offset)
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== amd64_native_gregset32_num_regs);
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gdb_assert (ARRAY_SIZE (x86_64_linux_gregset64_reg_offset)
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== amd64_native_gregset64_num_regs);
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}
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