334 lines
8.2 KiB
C
334 lines
8.2 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 "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 <sys/reg.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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/* The register sets used in GNU/Linux ELF core-dumps are identical to
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the register sets used by `ptrace'. The corresponding types are
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`elf_gregset_t' for the general-purpose registers (with
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`elf_greg_t' the type of a single GP register) and `elf_fpregset_t'
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for the floating-point registers. */
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/* Mapping between the general-purpose registers in `struct user'
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format and GDB's register array layout. */
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static int regmap[] =
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{
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RAX, RBX, RCX, RDX,
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RSI, RDI, RBP, RSP,
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R8, R9, R10, R11,
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R12, R13, R14, R15,
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RIP, EFLAGS, CS, SS,
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DS, ES, FS, GS
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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 GETREGS_SUPPLIES(regno) \
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(0 <= (regno) && (regno) < X86_64_NUM_GREGS)
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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 array 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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elf_greg_t *regp = (elf_greg_t *) gregsetp;
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int i;
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for (i = 0; i < X86_64_NUM_GREGS; i++)
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supply_register (i, regp + regmap[i]);
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}
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/* Fill register REGNO (if it is a general-purpose register) in
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*GREGSETPS with the value in GDB's register array. If REGNO 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 regno)
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{
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elf_greg_t *regp = (elf_greg_t *) gregsetp;
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int i;
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for (i = 0; i < X86_64_NUM_GREGS; i++)
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if (regno == -1 || regno == i)
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regcache_collect (i, regp + regmap[i]);
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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 array. */
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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 array
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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 regno)
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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, regno);
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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 array 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 ((char *) 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 array. 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 array. */
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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 array
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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 regno)
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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, regno);
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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 REGNO from the child process. If REGNO 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 regno)
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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 (regno == -1)
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{
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fetch_regs (tid);
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fetch_fpregs (tid);
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return;
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}
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if (GETREGS_SUPPLIES (regno))
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{
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fetch_regs (tid);
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return;
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}
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if (GETFPREGS_SUPPLIES (regno))
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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.", regno);
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}
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/* Store register REGNO back into the child process. If REGNO is -1,
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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 regno)
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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 (regno == -1)
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{
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store_regs (tid, regno);
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store_fpregs (tid, regno);
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return;
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}
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if (GETREGS_SUPPLIES (regno))
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{
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store_regs (tid, regno);
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return;
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}
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if (GETFPREGS_SUPPLIES (regno))
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{
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store_fpregs (tid, regno);
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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.", regno);
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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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