48037eadc7
* x86-64-tdep.c (x86_64_extract_return_value) (x86_64_store_return_value): Use regcache instead of regbuf. (x86_64_gdbarch_init): Change related set_gdbarch_* functions. * x86-64-linux-nat.c (fill_gregset): Use regcache.
493 lines
12 KiB
C
493 lines
12 KiB
C
/* Native-dependent code for GNU/Linux x86-64.
|
||
|
||
Copyright 2001, 2002, 2003 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 "gdb_assert.h"
|
||
#include "gdb_string.h"
|
||
#include "x86-64-tdep.h"
|
||
|
||
#include <sys/ptrace.h>
|
||
#include <sys/debugreg.h>
|
||
#include <sys/syscall.h>
|
||
#include <sys/procfs.h>
|
||
#include <sys/reg.h>
|
||
|
||
/* Mapping between the general-purpose registers in `struct user'
|
||
format and GDB's register array layout. */
|
||
|
||
static int x86_64_regmap[] = {
|
||
RAX, RBX, RCX, RDX,
|
||
RSI, RDI, RBP, RSP,
|
||
R8, R9, R10, R11,
|
||
R12, R13, R14, R15,
|
||
RIP, EFLAGS, CS, SS,
|
||
DS, ES, FS, GS
|
||
};
|
||
|
||
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);
|
||
}
|
||
|
||
|
||
/* The register sets used in GNU/Linux ELF core-dumps are identical to
|
||
the register sets used by `ptrace'. */
|
||
|
||
#define GETREGS_SUPPLIES(regno) \
|
||
(0 <= (regno) && (regno) < x86_64_num_gregs)
|
||
#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 array with the general-purpose register values
|
||
in *GREGSETP. */
|
||
|
||
void
|
||
supply_gregset (elf_gregset_t * gregsetp)
|
||
{
|
||
elf_greg_t *regp = (elf_greg_t *) gregsetp;
|
||
int i;
|
||
|
||
for (i = 0; i < x86_64_num_gregs; i++)
|
||
supply_register (i, (char *) (regp + x86_64_regmap[i]));
|
||
}
|
||
|
||
/* Fill register REGNO (if it is a general-purpose register) in
|
||
*GREGSETPS with the value in GDB's register array. If REGNO is -1,
|
||
do this for all registers. */
|
||
|
||
void
|
||
fill_gregset (elf_gregset_t * gregsetp, int regno)
|
||
{
|
||
elf_greg_t *regp = (elf_greg_t *) gregsetp;
|
||
int i;
|
||
|
||
for (i = 0; i < x86_64_num_gregs; i++)
|
||
if ((regno == -1 || regno == i))
|
||
regcache_collect (i, (char *) (regp + x86_64_regmap[i]));
|
||
}
|
||
|
||
/* Fetch all general-purpose registers from process/thread TID and
|
||
store their values in GDB's register array. */
|
||
|
||
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 array
|
||
into the process/thread specified by TID. */
|
||
|
||
static void
|
||
store_regs (int tid, int regno)
|
||
{
|
||
elf_gregset_t regs;
|
||
|
||
if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0)
|
||
perror_with_name ("Couldn't get registers");
|
||
|
||
fill_gregset (®s, regno);
|
||
|
||
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. */
|
||
|
||
static void *
|
||
x86_64_fxsave_offset (elf_fpregset_t * fxsave, int regnum)
|
||
{
|
||
const char *reg_name;
|
||
int reg_index;
|
||
|
||
gdb_assert (x86_64_num_gregs - 1 < regnum && regnum < x86_64_num_regs);
|
||
|
||
reg_name = x86_64_register_name (regnum);
|
||
|
||
if (reg_name[0] == 's' && reg_name[1] == 't')
|
||
{
|
||
reg_index = reg_name[2] - '0';
|
||
return &fxsave->st_space[reg_index * 2];
|
||
}
|
||
|
||
if (reg_name[0] == 'x' && reg_name[1] == 'm' && reg_name[2] == 'm')
|
||
{
|
||
reg_index = reg_name[3] - '0';
|
||
return &fxsave->xmm_space[reg_index * 4];
|
||
}
|
||
|
||
if (strcmp (reg_name, "mxcsr") == 0)
|
||
return &fxsave->mxcsr;
|
||
|
||
return NULL;
|
||
}
|
||
|
||
/* Fill GDB's register array with the floating-point and SSE register
|
||
values in *FXSAVE. This function masks off any of the reserved
|
||
bits in *FXSAVE. */
|
||
|
||
void
|
||
supply_fpregset (elf_fpregset_t * fxsave)
|
||
{
|
||
int i, reg_st0, reg_mxcsr;
|
||
|
||
reg_st0 = x86_64_register_number ("st0");
|
||
reg_mxcsr = x86_64_register_number ("mxcsr");
|
||
|
||
gdb_assert (reg_st0 > 0 && reg_mxcsr > reg_st0);
|
||
|
||
for (i = reg_st0; i <= reg_mxcsr; i++)
|
||
supply_register (i, x86_64_fxsave_offset (fxsave, i));
|
||
}
|
||
|
||
/* Fill register REGNUM (if it is a floating-point or SSE register) in
|
||
*FXSAVE with the value in GDB's register array. If REGNUM is -1, do
|
||
this for all registers. This function doesn't touch any of the
|
||
reserved bits in *FXSAVE. */
|
||
|
||
void
|
||
fill_fpregset (elf_fpregset_t * fxsave, int regnum)
|
||
{
|
||
int i, last_regnum = MXCSR_REGNUM;
|
||
void *ptr;
|
||
|
||
if (gdbarch_tdep (current_gdbarch)->num_xmm_regs == 0)
|
||
last_regnum = FOP_REGNUM;
|
||
|
||
for (i = FP0_REGNUM; i <= last_regnum; i++)
|
||
if (regnum == -1 || regnum == i)
|
||
{
|
||
ptr = x86_64_fxsave_offset (fxsave, i);
|
||
if (ptr)
|
||
regcache_collect (i, ptr);
|
||
}
|
||
}
|
||
|
||
/* Fetch all floating-point registers from process/thread TID and store
|
||
thier values in GDB's register array. */
|
||
|
||
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 array
|
||
into the process/thread specified by TID. */
|
||
|
||
static void
|
||
store_fpregs (int tid, int regno)
|
||
{
|
||
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, regno);
|
||
|
||
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 REGNO from the child process. If REGNO is -1, do
|
||
this for all registers (including the floating point and SSE
|
||
registers). */
|
||
|
||
void
|
||
fetch_inferior_registers (int regno)
|
||
{
|
||
int tid;
|
||
|
||
/* GNU/Linux LWP ID's are process ID's. */
|
||
if ((tid = TIDGET (inferior_ptid)) == 0)
|
||
tid = PIDGET (inferior_ptid); /* Not a threaded program. */
|
||
|
||
if (regno == -1)
|
||
{
|
||
fetch_regs (tid);
|
||
fetch_fpregs (tid);
|
||
return;
|
||
}
|
||
|
||
if (GETREGS_SUPPLIES (regno))
|
||
{
|
||
fetch_regs (tid);
|
||
return;
|
||
}
|
||
|
||
if (GETFPREGS_SUPPLIES (regno))
|
||
{
|
||
fetch_fpregs (tid);
|
||
return;
|
||
}
|
||
|
||
internal_error (__FILE__, __LINE__,
|
||
"Got request for bad register number %d.", regno);
|
||
}
|
||
|
||
/* Store register REGNO back into the child process. If REGNO is -1,
|
||
do this for all registers (including the floating point and SSE
|
||
registers). */
|
||
void
|
||
store_inferior_registers (int regno)
|
||
{
|
||
int tid;
|
||
|
||
/* GNU/Linux LWP ID's are process ID's. */
|
||
if ((tid = TIDGET (inferior_ptid)) == 0)
|
||
tid = PIDGET (inferior_ptid); /* Not a threaded program. */
|
||
|
||
if (regno == -1)
|
||
{
|
||
store_regs (tid, regno);
|
||
store_fpregs (tid, regno);
|
||
return;
|
||
}
|
||
|
||
if (GETREGS_SUPPLIES (regno))
|
||
{
|
||
store_regs (tid, regno);
|
||
return;
|
||
}
|
||
|
||
if (GETFPREGS_SUPPLIES (regno))
|
||
{
|
||
store_fpregs (tid, regno);
|
||
return;
|
||
}
|
||
|
||
internal_error (__FILE__, __LINE__,
|
||
"Got request to store bad register number %d.", regno);
|
||
}
|
||
|
||
|
||
static const unsigned char linux_syscall[] = { 0x0f, 0x05 };
|
||
|
||
#define LINUX_SYSCALL_LEN (sizeof linux_syscall)
|
||
|
||
/* The system call number is stored in the %rax register. */
|
||
#define LINUX_SYSCALL_REGNUM 0 /* %rax */
|
||
|
||
/* We are specifically interested in the sigreturn and rt_sigreturn
|
||
system calls. */
|
||
|
||
#ifndef SYS_sigreturn
|
||
#define SYS_sigreturn __NR_sigreturn
|
||
#endif
|
||
#ifndef SYS_rt_sigreturn
|
||
#define SYS_rt_sigreturn __NR_rt_sigreturn
|
||
#endif
|
||
|
||
/* Offset to saved processor flags, from <asm/sigcontext.h>. */
|
||
#define LINUX_SIGCONTEXT_EFLAGS_OFFSET (152)
|
||
/* Offset to saved processor registers from <asm/ucontext.h> */
|
||
#define LINUX_UCONTEXT_SIGCONTEXT_OFFSET (36)
|
||
|
||
/* Interpreting register set info found in core files. */
|
||
/* Provide registers to GDB from a core file.
|
||
|
||
CORE_REG_SECT points to an array of bytes, which are the contents
|
||
of a `note' from a core file which BFD thinks might contain
|
||
register contents. CORE_REG_SIZE is its size.
|
||
|
||
WHICH says which register set corelow suspects this is:
|
||
0 --- the general-purpose register set, in elf_gregset_t format
|
||
2 --- the floating-point register set, in elf_fpregset_t format
|
||
|
||
REG_ADDR isn't used on GNU/Linux. */
|
||
|
||
static void
|
||
fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
|
||
int which, CORE_ADDR reg_addr)
|
||
{
|
||
elf_gregset_t gregset;
|
||
elf_fpregset_t fpregset;
|
||
switch (which)
|
||
{
|
||
case 0:
|
||
if (core_reg_size != sizeof (gregset))
|
||
warning ("Wrong size gregset in core file.");
|
||
else
|
||
{
|
||
memcpy (&gregset, core_reg_sect, sizeof (gregset));
|
||
supply_gregset (&gregset);
|
||
}
|
||
break;
|
||
|
||
case 2:
|
||
if (core_reg_size != sizeof (fpregset))
|
||
warning ("Wrong size fpregset in core file.");
|
||
else
|
||
{
|
||
memcpy (&fpregset, core_reg_sect, sizeof (fpregset));
|
||
supply_fpregset (&fpregset);
|
||
}
|
||
break;
|
||
|
||
default:
|
||
/* We've covered all the kinds of registers we know about here,
|
||
so this must be something we wouldn't know what to do with
|
||
anyway. Just ignore it. */
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Register that we are able to handle GNU/Linux ELF core file formats. */
|
||
|
||
static struct core_fns linux_elf_core_fns = {
|
||
bfd_target_elf_flavour, /* core_flavour */
|
||
default_check_format, /* check_format */
|
||
default_core_sniffer, /* core_sniffer */
|
||
fetch_core_registers, /* core_read_registers */
|
||
NULL /* next */
|
||
};
|
||
|
||
|
||
#if !defined (offsetof)
|
||
#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
|
||
#endif
|
||
|
||
/* Return the address of register REGNUM. BLOCKEND is the value of
|
||
u.u_ar0, which should point to the registers. */
|
||
CORE_ADDR
|
||
x86_64_register_u_addr (CORE_ADDR blockend, int regnum)
|
||
{
|
||
struct user u;
|
||
CORE_ADDR fpstate;
|
||
CORE_ADDR ubase;
|
||
ubase = blockend;
|
||
if (IS_FP_REGNUM (regnum))
|
||
{
|
||
fpstate = ubase + ((char *) &u.i387.st_space - (char *) &u);
|
||
return (fpstate + 16 * (regnum - FP0_REGNUM));
|
||
}
|
||
else if (IS_SSE_REGNUM (regnum))
|
||
{
|
||
fpstate = ubase + ((char *) &u.i387.xmm_space - (char *) &u);
|
||
return (fpstate + 16 * (regnum - XMM0_REGNUM));
|
||
}
|
||
else
|
||
return (ubase + 8 * x86_64_regmap[regnum]);
|
||
}
|
||
|
||
void
|
||
_initialize_x86_64_linux_nat (void)
|
||
{
|
||
add_core_fns (&linux_elf_core_fns);
|
||
}
|
||
|
||
int
|
||
kernel_u_size (void)
|
||
{
|
||
return (sizeof (struct user));
|
||
}
|