406 lines
11 KiB
C
406 lines
11 KiB
C
/* Native-dependent code for GNU/Linux x86-64.
|
||
|
||
Copyright 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
|
||
Contributed by Jiri Smid, SuSE Labs.
|
||
|
||
This file is part of GDB.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 2 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program; if not, write to the Free Software
|
||
Foundation, Inc., 59 Temple Place - Suite 330,
|
||
Boston, MA 02111-1307, USA. */
|
||
|
||
#include "defs.h"
|
||
#include "inferior.h"
|
||
#include "gdbcore.h"
|
||
#include "regcache.h"
|
||
#include "linux-nat.h"
|
||
|
||
#include "gdb_assert.h"
|
||
#include "gdb_string.h"
|
||
#include <sys/ptrace.h>
|
||
#include <sys/debugreg.h>
|
||
#include <sys/syscall.h>
|
||
#include <sys/procfs.h>
|
||
#include <asm/prctl.h>
|
||
/* FIXME ezannoni-2003-07-09: we need <sys/reg.h> to be included after
|
||
<asm/ptrace.h> because the latter redefines FS and GS for no apparent
|
||
reason, and those definitions don't match the ones that libpthread_db
|
||
uses, which come from <sys/reg.h>. */
|
||
/* ezannoni-2003-07-09: I think this is fixed. The extraneous defs have
|
||
been removed from ptrace.h in the kernel. However, better safe than
|
||
sorry. */
|
||
#include <asm/ptrace.h>
|
||
#include <sys/reg.h>
|
||
#include "gdb_proc_service.h"
|
||
|
||
/* Prototypes for supply_gregset etc. */
|
||
#include "gregset.h"
|
||
|
||
#include "x86-64-tdep.h"
|
||
#include "x86-64-linux-tdep.h"
|
||
#include "i386-linux-tdep.h"
|
||
#include "amd64-nat.h"
|
||
|
||
/* Mapping between the general-purpose registers in GNU/Linux x86-64
|
||
`struct user' format and GDB's register cache layout. */
|
||
|
||
static int x86_64_linux_gregset64_reg_offset[] =
|
||
{
|
||
RAX * 8, RBX * 8, /* %rax, %rbx */
|
||
RCX * 8, RDX * 8, /* %rcx, %rdx */
|
||
RSI * 8, RDI * 8, /* %rsi, %rdi */
|
||
RBP * 8, RSP * 8, /* %rbp, %rsp */
|
||
R8 * 8, R9 * 8, /* %r8 ... */
|
||
R10 * 8, R11 * 8,
|
||
R12 * 8, R13 * 8,
|
||
R14 * 8, R15 * 8, /* ... %r15 */
|
||
RIP * 8, EFLAGS * 8, /* %rip, %eflags */
|
||
CS * 8, SS * 8, /* %cs, %ss */
|
||
DS * 8, ES * 8, /* %ds, %es */
|
||
FS * 8, GS * 8 /* %fs, %gs */
|
||
};
|
||
|
||
|
||
/* Mapping between the general-purpose registers in GNU/Linux x86-64
|
||
`struct user' format and GDB's register cache layout for GNU/Linux
|
||
i386.
|
||
|
||
Note that most GNU/Linux x86-64 registers are 64-bit, while the
|
||
GNU/Linux i386 registers are all 32-bit, but since we're
|
||
little-endian we get away with that. */
|
||
|
||
/* From <sys/reg.h> on GNU/Linux i386. */
|
||
static int x86_64_linux_gregset32_reg_offset[] =
|
||
{
|
||
10 * 8, 11 * 8, /* %eax, %ecx */
|
||
12 * 8, 13 * 8, /* %edx, %ebx */
|
||
19 * 8, 4 * 8, /* %esp, %ebp */
|
||
13 * 8, 14 * 8, /* %esi, %edi */
|
||
16 * 8, 18 * 8, /* %eip, %eflags */
|
||
17 * 8, 20 * 8, /* %cs, %ss */
|
||
23 * 8, 24 * 8, /* %ds, %es */
|
||
25 * 4, 26 * 4, /* %fs, %gs */
|
||
-1, -1, -1, -1, -1, -1, -1, -1,
|
||
-1, -1, -1, -1, -1, -1, -1, -1,
|
||
-1, -1, -1, -1, -1, -1, -1, -1, -1,
|
||
15 * 8 /* "orig_eax" */
|
||
};
|
||
|
||
/* Which ptrace request retrieves which registers?
|
||
These apply to the corresponding SET requests as well. */
|
||
|
||
#define GETFPREGS_SUPPLIES(regno) \
|
||
(FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM)
|
||
|
||
|
||
/* Transfering the general-purpose registers between GDB, inferiors
|
||
and core files. */
|
||
|
||
/* Fill GDB's register cache with the general-purpose register values
|
||
in *GREGSETP. */
|
||
|
||
void
|
||
supply_gregset (elf_gregset_t *gregsetp)
|
||
{
|
||
amd64_supply_native_gregset (current_regcache, gregsetp, -1);
|
||
}
|
||
|
||
/* Fill register REGNUM (if it is a general-purpose register) in
|
||
*GREGSETP with the value in GDB's register cache. If REGNUM is -1,
|
||
do this for all registers. */
|
||
|
||
void
|
||
fill_gregset (elf_gregset_t *gregsetp, int regnum)
|
||
{
|
||
amd64_collect_native_gregset (current_regcache, gregsetp, regnum);
|
||
}
|
||
|
||
/* Fetch all general-purpose registers from process/thread TID and
|
||
store their values in GDB's register cache. */
|
||
|
||
static void
|
||
fetch_regs (int tid)
|
||
{
|
||
elf_gregset_t regs;
|
||
|
||
if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0)
|
||
perror_with_name ("Couldn't get registers");
|
||
|
||
supply_gregset (®s);
|
||
}
|
||
|
||
/* Store all valid general-purpose registers in GDB's register cache
|
||
into the process/thread specified by TID. */
|
||
|
||
static void
|
||
store_regs (int tid, int regnum)
|
||
{
|
||
elf_gregset_t regs;
|
||
|
||
if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0)
|
||
perror_with_name ("Couldn't get registers");
|
||
|
||
fill_gregset (®s, regnum);
|
||
|
||
if (ptrace (PTRACE_SETREGS, tid, 0, (long) ®s) < 0)
|
||
perror_with_name ("Couldn't write registers");
|
||
}
|
||
|
||
|
||
/* Transfering floating-point registers between GDB, inferiors and cores. */
|
||
|
||
/* Fill GDB's register cache with the floating-point and SSE register
|
||
values in *FPREGSETP. */
|
||
|
||
void
|
||
supply_fpregset (elf_fpregset_t *fpregsetp)
|
||
{
|
||
x86_64_supply_fxsave (current_regcache, -1, fpregsetp);
|
||
}
|
||
|
||
/* Fill register REGNUM (if it is a floating-point or SSE register) in
|
||
*FPREGSETP with the value in GDB's register cache. If REGNUM is
|
||
-1, do this for all registers. */
|
||
|
||
void
|
||
fill_fpregset (elf_fpregset_t *fpregsetp, int regnum)
|
||
{
|
||
x86_64_fill_fxsave ((char *) fpregsetp, regnum);
|
||
}
|
||
|
||
/* Fetch all floating-point registers from process/thread TID and store
|
||
thier values in GDB's register cache. */
|
||
|
||
static void
|
||
fetch_fpregs (int tid)
|
||
{
|
||
elf_fpregset_t fpregs;
|
||
|
||
if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0)
|
||
perror_with_name ("Couldn't get floating point status");
|
||
|
||
supply_fpregset (&fpregs);
|
||
}
|
||
|
||
/* Store all valid floating-point registers in GDB's register cache
|
||
into the process/thread specified by TID. */
|
||
|
||
static void
|
||
store_fpregs (int tid, int regnum)
|
||
{
|
||
elf_fpregset_t fpregs;
|
||
|
||
if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0)
|
||
perror_with_name ("Couldn't get floating point status");
|
||
|
||
fill_fpregset (&fpregs, regnum);
|
||
|
||
if (ptrace (PTRACE_SETFPREGS, tid, 0, (long) &fpregs) < 0)
|
||
perror_with_name ("Couldn't write floating point status");
|
||
}
|
||
|
||
|
||
/* Transferring arbitrary registers between GDB and inferior. */
|
||
|
||
/* Fetch register REGNUM from the child process. If REGNUM is -1, do
|
||
this for all registers (including the floating point and SSE
|
||
registers). */
|
||
|
||
void
|
||
fetch_inferior_registers (int regnum)
|
||
{
|
||
int tid;
|
||
|
||
/* GNU/Linux LWP ID's are process ID's. */
|
||
tid = TIDGET (inferior_ptid);
|
||
if (tid == 0)
|
||
tid = PIDGET (inferior_ptid); /* Not a threaded program. */
|
||
|
||
if (regnum == -1 || amd64_native_gregset_supplies_p (regnum))
|
||
{
|
||
fetch_regs (tid);
|
||
if (regnum != -1)
|
||
return;
|
||
}
|
||
|
||
if (regnum == -1 || GETFPREGS_SUPPLIES (regnum))
|
||
{
|
||
fetch_fpregs (tid);
|
||
return;
|
||
}
|
||
|
||
internal_error (__FILE__, __LINE__,
|
||
"Got request for bad register number %d.", regnum);
|
||
}
|
||
|
||
/* Store register REGNUM back into the child process. If REGNUM is
|
||
-1, do this for all registers (including the floating-point and SSE
|
||
registers). */
|
||
|
||
void
|
||
store_inferior_registers (int regnum)
|
||
{
|
||
int tid;
|
||
|
||
/* GNU/Linux LWP ID's are process ID's. */
|
||
tid = TIDGET (inferior_ptid);
|
||
if (tid == 0)
|
||
tid = PIDGET (inferior_ptid); /* Not a threaded program. */
|
||
|
||
if (regnum == -1 || amd64_native_gregset_supplies_p (regnum))
|
||
{
|
||
store_regs (tid, regnum);
|
||
if (regnum != -1)
|
||
return;
|
||
}
|
||
|
||
if (regnum == -1 || GETFPREGS_SUPPLIES (regnum))
|
||
{
|
||
store_fpregs (tid, regnum);
|
||
return;
|
||
}
|
||
|
||
internal_error (__FILE__, __LINE__,
|
||
"Got request to store bad register number %d.", regnum);
|
||
}
|
||
|
||
|
||
static unsigned long
|
||
x86_64_linux_dr_get (int regnum)
|
||
{
|
||
int tid;
|
||
unsigned long value;
|
||
|
||
/* FIXME: kettenis/2001-01-29: It's not clear what we should do with
|
||
multi-threaded processes here. For now, pretend there is just
|
||
one thread. */
|
||
tid = PIDGET (inferior_ptid);
|
||
|
||
/* FIXME: kettenis/2001-03-27: Calling perror_with_name if the
|
||
ptrace call fails breaks debugging remote targets. The correct
|
||
way to fix this is to add the hardware breakpoint and watchpoint
|
||
stuff to the target vectore. For now, just return zero if the
|
||
ptrace call fails. */
|
||
errno = 0;
|
||
value = ptrace (PT_READ_U, tid,
|
||
offsetof (struct user, u_debugreg[regnum]), 0);
|
||
if (errno != 0)
|
||
#if 0
|
||
perror_with_name ("Couldn't read debug register");
|
||
#else
|
||
return 0;
|
||
#endif
|
||
|
||
return value;
|
||
}
|
||
|
||
static void
|
||
x86_64_linux_dr_set (int regnum, unsigned long value)
|
||
{
|
||
int tid;
|
||
|
||
/* FIXME: kettenis/2001-01-29: It's not clear what we should do with
|
||
multi-threaded processes here. For now, pretend there is just
|
||
one thread. */
|
||
tid = PIDGET (inferior_ptid);
|
||
|
||
errno = 0;
|
||
ptrace (PT_WRITE_U, tid, offsetof (struct user, u_debugreg[regnum]), value);
|
||
if (errno != 0)
|
||
perror_with_name ("Couldn't write debug register");
|
||
}
|
||
|
||
void
|
||
x86_64_linux_dr_set_control (unsigned long control)
|
||
{
|
||
x86_64_linux_dr_set (DR_CONTROL, control);
|
||
}
|
||
|
||
void
|
||
x86_64_linux_dr_set_addr (int regnum, CORE_ADDR addr)
|
||
{
|
||
gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
|
||
|
||
x86_64_linux_dr_set (DR_FIRSTADDR + regnum, addr);
|
||
}
|
||
|
||
void
|
||
x86_64_linux_dr_reset_addr (int regnum)
|
||
{
|
||
gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
|
||
|
||
x86_64_linux_dr_set (DR_FIRSTADDR + regnum, 0L);
|
||
}
|
||
|
||
unsigned long
|
||
x86_64_linux_dr_get_status (void)
|
||
{
|
||
return x86_64_linux_dr_get (DR_STATUS);
|
||
}
|
||
|
||
|
||
ps_err_e
|
||
ps_get_thread_area (const struct ps_prochandle *ph,
|
||
lwpid_t lwpid, int idx, void **base)
|
||
{
|
||
/* This definition comes from prctl.h, but some kernels may not have it. */
|
||
#ifndef PTRACE_ARCH_PRCTL
|
||
#define PTRACE_ARCH_PRCTL 30
|
||
#endif
|
||
|
||
/* FIXME: ezannoni-2003-07-09 see comment above about include file order.
|
||
We could be getting bogus values for these two. */
|
||
gdb_assert (FS < ELF_NGREG);
|
||
gdb_assert (GS < ELF_NGREG);
|
||
switch (idx)
|
||
{
|
||
case FS:
|
||
if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0)
|
||
return PS_OK;
|
||
break;
|
||
case GS:
|
||
if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0)
|
||
return PS_OK;
|
||
break;
|
||
default: /* Should not happen. */
|
||
return PS_BADADDR;
|
||
}
|
||
return PS_ERR; /* ptrace failed. */
|
||
}
|
||
|
||
|
||
void
|
||
child_post_startup_inferior (ptid_t ptid)
|
||
{
|
||
i386_cleanup_dregs ();
|
||
linux_child_post_startup_inferior (ptid);
|
||
}
|
||
|
||
|
||
/* Provide a prototype to silence -Wmissing-prototypes. */
|
||
void _initialize_x86_64_linux_nat (void);
|
||
|
||
void
|
||
_initialize_x86_64_linux_nat (void)
|
||
{
|
||
amd64_native_gregset32_reg_offset = x86_64_linux_gregset32_reg_offset;
|
||
amd64_native_gregset32_num_regs = I386_LINUX_NUM_REGS;
|
||
amd64_native_gregset64_reg_offset = x86_64_linux_gregset64_reg_offset;
|
||
|
||
gdb_assert (ARRAY_SIZE (x86_64_linux_gregset32_reg_offset)
|
||
== amd64_native_gregset32_num_regs);
|
||
gdb_assert (ARRAY_SIZE (x86_64_linux_gregset64_reg_offset)
|
||
== amd64_native_gregset64_num_regs);
|
||
}
|