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old-cross-binutils/gdb/amd64-linux-nat.c
Joel Brobecker 28e7fd6234 Update years in copyright notice for the GDB files. 
Two modifications:
  1. The addition of 2013 to the copyright year range for every file;
  2. The use of a single year range, instead of potentially multiple
     year ranges, as approved by the FSF.
2013-01-01 06:33:28 +00:00

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/* Native-dependent code for GNU/Linux x86-64.
Copyright (C) 2001-2013 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 3 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, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "inferior.h"
#include "gdbcore.h"
#include "regcache.h"
#include "regset.h"
#include "linux-nat.h"
#include "amd64-linux-tdep.h"
#include "gdb_assert.h"
#include "gdb_string.h"
#include "elf/common.h"
#include <sys/uio.h>
#include <sys/ptrace.h>
#include <sys/debugreg.h>
#include <sys/syscall.h>
#include <sys/procfs.h>
#include <sys/user.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 "amd64-tdep.h"
#include "i386-linux-tdep.h"
#include "amd64-nat.h"
#include "i386-nat.h"
#include "i386-xstate.h"
#ifndef PTRACE_GETREGSET
#define PTRACE_GETREGSET 0x4204
#endif
#ifndef PTRACE_SETREGSET
#define PTRACE_SETREGSET 0x4205
#endif
/* Per-thread arch-specific data we want to keep. */
struct arch_lwp_info
{
/* Non-zero if our copy differs from what's recorded in the thread. */
int debug_registers_changed;
};
/* Does the current host support PTRACE_GETREGSET? */
static int have_ptrace_getregset = -1;
/* 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 amd64_linux_gregset32_reg_offset[] =
{
RAX * 8, RCX * 8, /* %eax, %ecx */
RDX * 8, RBX * 8, /* %edx, %ebx */
RSP * 8, RBP * 8, /* %esp, %ebp */
RSI * 8, RDI * 8, /* %esi, %edi */
RIP * 8, EFLAGS * 8, /* %eip, %eflags */
CS * 8, SS * 8, /* %cs, %ss */
DS * 8, ES * 8, /* %ds, %es */
FS * 8, GS * 8, /* %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,
-1, -1, -1, -1, -1, -1, -1, -1,
ORIG_RAX * 8 /* "orig_eax" */
};
/* 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 (struct regcache *regcache, const elf_gregset_t *gregsetp)
{
amd64_supply_native_gregset (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 (const struct regcache *regcache,
elf_gregset_t *gregsetp, int regnum)
{
amd64_collect_native_gregset (regcache, gregsetp, regnum);
}
/* 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 (struct regcache *regcache, const elf_fpregset_t *fpregsetp)
{
amd64_supply_fxsave (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 (const struct regcache *regcache,
elf_fpregset_t *fpregsetp, int regnum)
{
amd64_collect_fxsave (regcache, regnum, fpregsetp);
}
/* 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). */
static void
amd64_linux_fetch_inferior_registers (struct target_ops *ops,
struct regcache *regcache, int regnum)
{
struct gdbarch *gdbarch = get_regcache_arch (regcache);
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 (gdbarch, regnum))
{
elf_gregset_t regs;
if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
perror_with_name (_("Couldn't get registers"));
amd64_supply_native_gregset (regcache, &regs, -1);
if (regnum != -1)
return;
}
if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
{
elf_fpregset_t fpregs;
if (have_ptrace_getregset)
{
char xstateregs[I386_XSTATE_MAX_SIZE];
struct iovec iov;
iov.iov_base = xstateregs;
iov.iov_len = sizeof (xstateregs);
if (ptrace (PTRACE_GETREGSET, tid,
(unsigned int) NT_X86_XSTATE, (long) &iov) < 0)
perror_with_name (_("Couldn't get extended state status"));
amd64_supply_xsave (regcache, -1, xstateregs);
}
else
{
if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0)
perror_with_name (_("Couldn't get floating point status"));
amd64_supply_fxsave (regcache, -1, &fpregs);
}
}
}
/* Store register REGNUM back into the child process. If REGNUM is
-1, do this for all registers (including the floating-point and SSE
registers). */
static void
amd64_linux_store_inferior_registers (struct target_ops *ops,
struct regcache *regcache, int regnum)
{
struct gdbarch *gdbarch = get_regcache_arch (regcache);
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 (gdbarch, regnum))
{
elf_gregset_t regs;
if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
perror_with_name (_("Couldn't get registers"));
amd64_collect_native_gregset (regcache, &regs, regnum);
if (ptrace (PTRACE_SETREGS, tid, 0, (long) &regs) < 0)
perror_with_name (_("Couldn't write registers"));
if (regnum != -1)
return;
}
if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
{
elf_fpregset_t fpregs;
if (have_ptrace_getregset)
{
char xstateregs[I386_XSTATE_MAX_SIZE];
struct iovec iov;
iov.iov_base = xstateregs;
iov.iov_len = sizeof (xstateregs);
if (ptrace (PTRACE_GETREGSET, tid,
(unsigned int) NT_X86_XSTATE, (long) &iov) < 0)
perror_with_name (_("Couldn't get extended state status"));
amd64_collect_xsave (regcache, regnum, xstateregs, 0);
if (ptrace (PTRACE_SETREGSET, tid,
(unsigned int) NT_X86_XSTATE, (long) &iov) < 0)
perror_with_name (_("Couldn't write extended state status"));
}
else
{
if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0)
perror_with_name (_("Couldn't get floating point status"));
amd64_collect_fxsave (regcache, regnum, &fpregs);
if (ptrace (PTRACE_SETFPREGS, tid, 0, (long) &fpregs) < 0)
perror_with_name (_("Couldn't write floating point status"));
}
}
}
/* Support for debug registers. */
static unsigned long
amd64_linux_dr_get (ptid_t ptid, int regnum)
{
int tid;
unsigned long value;
tid = TIDGET (ptid);
if (tid == 0)
tid = PIDGET (ptid);
errno = 0;
value = ptrace (PTRACE_PEEKUSER, tid,
offsetof (struct user, u_debugreg[regnum]), 0);
if (errno != 0)
perror_with_name (_("Couldn't read debug register"));
return value;
}
/* Set debug register REGNUM to VALUE in only the one LWP of PTID. */
static void
amd64_linux_dr_set (ptid_t ptid, int regnum, unsigned long value)
{
int tid;
tid = TIDGET (ptid);
if (tid == 0)
tid = PIDGET (ptid);
errno = 0;
ptrace (PTRACE_POKEUSER, tid,
offsetof (struct user, u_debugreg[regnum]), value);
if (errno != 0)
perror_with_name (_("Couldn't write debug register"));
}
/* Return the inferior's debug register REGNUM. */
static CORE_ADDR
amd64_linux_dr_get_addr (int regnum)
{
/* DR6 and DR7 are retrieved with some other way. */
gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
return amd64_linux_dr_get (inferior_ptid, regnum);
}
/* Return the inferior's DR7 debug control register. */
static unsigned long
amd64_linux_dr_get_control (void)
{
return amd64_linux_dr_get (inferior_ptid, DR_CONTROL);
}
/* Get DR_STATUS from only the one LWP of INFERIOR_PTID. */
static unsigned long
amd64_linux_dr_get_status (void)
{
return amd64_linux_dr_get (inferior_ptid, DR_STATUS);
}
/* Callback for linux_nat_iterate_watchpoint_lwps. Update the debug registers
of LWP. */
static int
update_debug_registers_callback (struct lwp_info *lwp, void *arg)
{
if (lwp->arch_private == NULL)
lwp->arch_private = XCNEW (struct arch_lwp_info);
/* The actual update is done later just before resuming the lwp, we
just mark that the registers need updating. */
lwp->arch_private->debug_registers_changed = 1;
/* If the lwp isn't stopped, force it to momentarily pause, so we
can update its debug registers. */
if (!lwp->stopped)
linux_stop_lwp (lwp);
/* Continue the iteration. */
return 0;
}
/* Set DR_CONTROL to CONTROL in all LWPs of the current inferior. */
static void
amd64_linux_dr_set_control (unsigned long control)
{
linux_nat_iterate_watchpoint_lwps (update_debug_registers_callback, NULL);
}
/* Set address REGNUM (zero based) to ADDR in all LWPs of the current
inferior. */
static void
amd64_linux_dr_set_addr (int regnum, CORE_ADDR addr)
{
gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
linux_nat_iterate_watchpoint_lwps (update_debug_registers_callback, NULL);
}
/* Called when resuming a thread.
If the debug regs have changed, update the thread's copies. */
static void
amd64_linux_prepare_to_resume (struct lwp_info *lwp)
{
int clear_status = 0;
/* NULL means this is the main thread still going through the shell,
or, no watchpoint has been set yet. In that case, there's
nothing to do. */
if (lwp->arch_private == NULL)
return;
if (lwp->arch_private->debug_registers_changed)
{
struct i386_debug_reg_state *state = i386_debug_reg_state ();
int i;
/* On Linux kernel before 2.6.33 commit
72f674d203cd230426437cdcf7dd6f681dad8b0d
if you enable a breakpoint by the DR_CONTROL bits you need to have
already written the corresponding DR_FIRSTADDR...DR_LASTADDR registers.
Ensure DR_CONTROL gets written as the very last register here. */
for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
if (state->dr_ref_count[i] > 0)
{
amd64_linux_dr_set (lwp->ptid, i, state->dr_mirror[i]);
/* If we're setting a watchpoint, any change the inferior
had done itself to the debug registers needs to be
discarded, otherwise, i386_stopped_data_address can get
confused. */
clear_status = 1;
}
amd64_linux_dr_set (lwp->ptid, DR_CONTROL, state->dr_control_mirror);
lwp->arch_private->debug_registers_changed = 0;
}
if (clear_status || lwp->stopped_by_watchpoint)
amd64_linux_dr_set (lwp->ptid, DR_STATUS, 0);
}
static void
amd64_linux_new_thread (struct lwp_info *lp)
{
struct arch_lwp_info *info = XCNEW (struct arch_lwp_info);
info->debug_registers_changed = 1;
lp->arch_private = info;
}
/* This function is called by libthread_db as part of its handling of
a request for a thread's local storage address. */
ps_err_e
ps_get_thread_area (const struct ps_prochandle *ph,
lwpid_t lwpid, int idx, void **base)
{
if (gdbarch_bfd_arch_info (target_gdbarch ())->bits_per_word == 32)
{
/* The full structure is found in <asm-i386/ldt.h>. The second
integer is the LDT's base_address and that is used to locate
the thread's local storage. See i386-linux-nat.c more
info. */
unsigned int desc[4];
/* This code assumes that "int" is 32 bits and that
GET_THREAD_AREA returns no more than 4 int values. */
gdb_assert (sizeof (int) == 4);
#ifndef PTRACE_GET_THREAD_AREA
#define PTRACE_GET_THREAD_AREA 25
#endif
if (ptrace (PTRACE_GET_THREAD_AREA,
lwpid, (void *) (long) idx, (unsigned long) &desc) < 0)
return PS_ERR;
/* Extend the value to 64 bits. Here it's assumed that a "long"
and a "void *" are the same. */
(*base) = (void *) (long) desc[1];
return PS_OK;
}
else
{
/* 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:
#ifdef HAVE_STRUCT_USER_REGS_STRUCT_FS_BASE
{
/* PTRACE_ARCH_PRCTL is obsolete since 2.6.25, where the
fs_base and gs_base fields of user_regs_struct can be
used directly. */
unsigned long fs;
errno = 0;
fs = ptrace (PTRACE_PEEKUSER, lwpid,
offsetof (struct user_regs_struct, fs_base), 0);
if (errno == 0)
{
*base = (void *) fs;
return PS_OK;
}
}
#endif
if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0)
return PS_OK;
break;
case GS:
#ifdef HAVE_STRUCT_USER_REGS_STRUCT_GS_BASE
{
unsigned long gs;
errno = 0;
gs = ptrace (PTRACE_PEEKUSER, lwpid,
offsetof (struct user_regs_struct, gs_base), 0);
if (errno == 0)
{
*base = (void *) gs;
return PS_OK;
}
}
#endif
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. */
}
static void (*super_post_startup_inferior) (ptid_t ptid);
static void
amd64_linux_child_post_startup_inferior (ptid_t ptid)
{
i386_cleanup_dregs ();
super_post_startup_inferior (ptid);
}
/* When GDB is built as a 64-bit application on linux, the
PTRACE_GETSIGINFO data is always presented in 64-bit layout. Since
debugging a 32-bit inferior with a 64-bit GDB should look the same
as debugging it with a 32-bit GDB, we do the 32-bit <-> 64-bit
conversion in-place ourselves. */
/* These types below (compat_*) define a siginfo type that is layout
compatible with the siginfo type exported by the 32-bit userspace
support. */
typedef int compat_int_t;
typedef unsigned int compat_uptr_t;
typedef int compat_time_t;
typedef int compat_timer_t;
typedef int compat_clock_t;
struct compat_timeval
{
compat_time_t tv_sec;
int tv_usec;
};
typedef union compat_sigval
{
compat_int_t sival_int;
compat_uptr_t sival_ptr;
} compat_sigval_t;
typedef struct compat_siginfo
{
int si_signo;
int si_errno;
int si_code;
union
{
int _pad[((128 / sizeof (int)) - 3)];
/* kill() */
struct
{
unsigned int _pid;
unsigned int _uid;
} _kill;
/* POSIX.1b timers */
struct
{
compat_timer_t _tid;
int _overrun;
compat_sigval_t _sigval;
} _timer;
/* POSIX.1b signals */
struct
{
unsigned int _pid;
unsigned int _uid;
compat_sigval_t _sigval;
} _rt;
/* SIGCHLD */
struct
{
unsigned int _pid;
unsigned int _uid;
int _status;
compat_clock_t _utime;
compat_clock_t _stime;
} _sigchld;
/* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
struct
{
unsigned int _addr;
} _sigfault;
/* SIGPOLL */
struct
{
int _band;
int _fd;
} _sigpoll;
} _sifields;
} compat_siginfo_t;
/* For x32, clock_t in _sigchld is 64bit aligned at 4 bytes. */
typedef struct compat_x32_clock
{
int lower;
int upper;
} compat_x32_clock_t;
typedef struct compat_x32_siginfo
{
int si_signo;
int si_errno;
int si_code;
union
{
int _pad[((128 / sizeof (int)) - 3)];
/* kill() */
struct
{
unsigned int _pid;
unsigned int _uid;
} _kill;
/* POSIX.1b timers */
struct
{
compat_timer_t _tid;
int _overrun;
compat_sigval_t _sigval;
} _timer;
/* POSIX.1b signals */
struct
{
unsigned int _pid;
unsigned int _uid;
compat_sigval_t _sigval;
} _rt;
/* SIGCHLD */
struct
{
unsigned int _pid;
unsigned int _uid;
int _status;
compat_x32_clock_t _utime;
compat_x32_clock_t _stime;
} _sigchld;
/* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
struct
{
unsigned int _addr;
} _sigfault;
/* SIGPOLL */
struct
{
int _band;
int _fd;
} _sigpoll;
} _sifields;
} compat_x32_siginfo_t;
#define cpt_si_pid _sifields._kill._pid
#define cpt_si_uid _sifields._kill._uid
#define cpt_si_timerid _sifields._timer._tid
#define cpt_si_overrun _sifields._timer._overrun
#define cpt_si_status _sifields._sigchld._status
#define cpt_si_utime _sifields._sigchld._utime
#define cpt_si_stime _sifields._sigchld._stime
#define cpt_si_ptr _sifields._rt._sigval.sival_ptr
#define cpt_si_addr _sifields._sigfault._addr
#define cpt_si_band _sifields._sigpoll._band
#define cpt_si_fd _sifields._sigpoll._fd
/* glibc at least up to 2.3.2 doesn't have si_timerid, si_overrun.
In their place is si_timer1,si_timer2. */
#ifndef si_timerid
#define si_timerid si_timer1
#endif
#ifndef si_overrun
#define si_overrun si_timer2
#endif
static void
compat_siginfo_from_siginfo (compat_siginfo_t *to, siginfo_t *from)
{
memset (to, 0, sizeof (*to));
to->si_signo = from->si_signo;
to->si_errno = from->si_errno;
to->si_code = from->si_code;
if (to->si_code == SI_TIMER)
{
to->cpt_si_timerid = from->si_timerid;
to->cpt_si_overrun = from->si_overrun;
to->cpt_si_ptr = (intptr_t) from->si_ptr;
}
else if (to->si_code == SI_USER)
{
to->cpt_si_pid = from->si_pid;
to->cpt_si_uid = from->si_uid;
}
else if (to->si_code < 0)
{
to->cpt_si_pid = from->si_pid;
to->cpt_si_uid = from->si_uid;
to->cpt_si_ptr = (intptr_t) from->si_ptr;
}
else
{
switch (to->si_signo)
{
case SIGCHLD:
to->cpt_si_pid = from->si_pid;
to->cpt_si_uid = from->si_uid;
to->cpt_si_status = from->si_status;
to->cpt_si_utime = from->si_utime;
to->cpt_si_stime = from->si_stime;
break;
case SIGILL:
case SIGFPE:
case SIGSEGV:
case SIGBUS:
to->cpt_si_addr = (intptr_t) from->si_addr;
break;
case SIGPOLL:
to->cpt_si_band = from->si_band;
to->cpt_si_fd = from->si_fd;
break;
default:
to->cpt_si_pid = from->si_pid;
to->cpt_si_uid = from->si_uid;
to->cpt_si_ptr = (intptr_t) from->si_ptr;
break;
}
}
}
static void
siginfo_from_compat_siginfo (siginfo_t *to, compat_siginfo_t *from)
{
memset (to, 0, sizeof (*to));
to->si_signo = from->si_signo;
to->si_errno = from->si_errno;
to->si_code = from->si_code;
if (to->si_code == SI_TIMER)
{
to->si_timerid = from->cpt_si_timerid;
to->si_overrun = from->cpt_si_overrun;
to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
}
else if (to->si_code == SI_USER)
{
to->si_pid = from->cpt_si_pid;
to->si_uid = from->cpt_si_uid;
}
if (to->si_code < 0)
{
to->si_pid = from->cpt_si_pid;
to->si_uid = from->cpt_si_uid;
to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
}
else
{
switch (to->si_signo)
{
case SIGCHLD:
to->si_pid = from->cpt_si_pid;
to->si_uid = from->cpt_si_uid;
to->si_status = from->cpt_si_status;
to->si_utime = from->cpt_si_utime;
to->si_stime = from->cpt_si_stime;
break;
case SIGILL:
case SIGFPE:
case SIGSEGV:
case SIGBUS:
to->si_addr = (void *) (intptr_t) from->cpt_si_addr;
break;
case SIGPOLL:
to->si_band = from->cpt_si_band;
to->si_fd = from->cpt_si_fd;
break;
default:
to->si_pid = from->cpt_si_pid;
to->si_uid = from->cpt_si_uid;
to->si_ptr = (void* ) (intptr_t) from->cpt_si_ptr;
break;
}
}
}
static void
compat_x32_siginfo_from_siginfo (compat_x32_siginfo_t *to,
siginfo_t *from)
{
memset (to, 0, sizeof (*to));
to->si_signo = from->si_signo;
to->si_errno = from->si_errno;
to->si_code = from->si_code;
if (to->si_code == SI_TIMER)
{
to->cpt_si_timerid = from->si_timerid;
to->cpt_si_overrun = from->si_overrun;
to->cpt_si_ptr = (intptr_t) from->si_ptr;
}
else if (to->si_code == SI_USER)
{
to->cpt_si_pid = from->si_pid;
to->cpt_si_uid = from->si_uid;
}
else if (to->si_code < 0)
{
to->cpt_si_pid = from->si_pid;
to->cpt_si_uid = from->si_uid;
to->cpt_si_ptr = (intptr_t) from->si_ptr;
}
else
{
switch (to->si_signo)
{
case SIGCHLD:
to->cpt_si_pid = from->si_pid;
to->cpt_si_uid = from->si_uid;
to->cpt_si_status = from->si_status;
memcpy (&to->cpt_si_utime, &from->si_utime,
sizeof (to->cpt_si_utime));
memcpy (&to->cpt_si_stime, &from->si_stime,
sizeof (to->cpt_si_stime));
break;
case SIGILL:
case SIGFPE:
case SIGSEGV:
case SIGBUS:
to->cpt_si_addr = (intptr_t) from->si_addr;
break;
case SIGPOLL:
to->cpt_si_band = from->si_band;
to->cpt_si_fd = from->si_fd;
break;
default:
to->cpt_si_pid = from->si_pid;
to->cpt_si_uid = from->si_uid;
to->cpt_si_ptr = (intptr_t) from->si_ptr;
break;
}
}
}
static void
siginfo_from_compat_x32_siginfo (siginfo_t *to,
compat_x32_siginfo_t *from)
{
memset (to, 0, sizeof (*to));
to->si_signo = from->si_signo;
to->si_errno = from->si_errno;
to->si_code = from->si_code;
if (to->si_code == SI_TIMER)
{
to->si_timerid = from->cpt_si_timerid;
to->si_overrun = from->cpt_si_overrun;
to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
}
else if (to->si_code == SI_USER)
{
to->si_pid = from->cpt_si_pid;
to->si_uid = from->cpt_si_uid;
}
if (to->si_code < 0)
{
to->si_pid = from->cpt_si_pid;
to->si_uid = from->cpt_si_uid;
to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
}
else
{
switch (to->si_signo)
{
case SIGCHLD:
to->si_pid = from->cpt_si_pid;
to->si_uid = from->cpt_si_uid;
to->si_status = from->cpt_si_status;
memcpy (&to->si_utime, &from->cpt_si_utime,
sizeof (to->si_utime));
memcpy (&to->si_stime, &from->cpt_si_stime,
sizeof (to->si_stime));
break;
case SIGILL:
case SIGFPE:
case SIGSEGV:
case SIGBUS:
to->si_addr = (void *) (intptr_t) from->cpt_si_addr;
break;
case SIGPOLL:
to->si_band = from->cpt_si_band;
to->si_fd = from->cpt_si_fd;
break;
default:
to->si_pid = from->cpt_si_pid;
to->si_uid = from->cpt_si_uid;
to->si_ptr = (void* ) (intptr_t) from->cpt_si_ptr;
break;
}
}
}
/* Convert a native/host siginfo object, into/from the siginfo in the
layout of the inferiors' architecture. Returns true if any
conversion was done; false otherwise. If DIRECTION is 1, then copy
from INF to NATIVE. If DIRECTION is 0, copy from NATIVE to
INF. */
static int
amd64_linux_siginfo_fixup (siginfo_t *native, gdb_byte *inf, int direction)
{
struct gdbarch *gdbarch = get_frame_arch (get_current_frame ());
/* Is the inferior 32-bit? If so, then do fixup the siginfo
object. */
if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32)
{
gdb_assert (sizeof (siginfo_t) == sizeof (compat_siginfo_t));
if (direction == 0)
compat_siginfo_from_siginfo ((struct compat_siginfo *) inf, native);
else
siginfo_from_compat_siginfo (native, (struct compat_siginfo *) inf);
return 1;
}
/* No fixup for native x32 GDB. */
else if (gdbarch_addr_bit (gdbarch) == 32 && sizeof (void *) == 8)
{
gdb_assert (sizeof (siginfo_t) == sizeof (compat_x32_siginfo_t));
if (direction == 0)
compat_x32_siginfo_from_siginfo ((struct compat_x32_siginfo *) inf,
native);
else
siginfo_from_compat_x32_siginfo (native,
(struct compat_x32_siginfo *) inf);
return 1;
}
else
return 0;
}
/* Get Linux/x86 target description from running target.
Value of CS segment register:
1. 64bit process: 0x33.
2. 32bit process: 0x23.
Value of DS segment register:
1. LP64 process: 0x0.
2. X32 process: 0x2b.
*/
#define AMD64_LINUX_USER64_CS 0x33
#define AMD64_LINUX_X32_DS 0x2b
static const struct target_desc *
amd64_linux_read_description (struct target_ops *ops)
{
unsigned long cs;
unsigned long ds;
int tid;
int is_64bit;
int is_x32;
static uint64_t xcr0;
/* GNU/Linux LWP ID's are process ID's. */
tid = TIDGET (inferior_ptid);
if (tid == 0)
tid = PIDGET (inferior_ptid); /* Not a threaded program. */
/* Get CS register. */
errno = 0;
cs = ptrace (PTRACE_PEEKUSER, tid,
offsetof (struct user_regs_struct, cs), 0);
if (errno != 0)
perror_with_name (_("Couldn't get CS register"));
is_64bit = cs == AMD64_LINUX_USER64_CS;
/* Get DS register. */
errno = 0;
ds = ptrace (PTRACE_PEEKUSER, tid,
offsetof (struct user_regs_struct, ds), 0);
if (errno != 0)
perror_with_name (_("Couldn't get DS register"));
is_x32 = ds == AMD64_LINUX_X32_DS;
if (sizeof (void *) == 4 && is_64bit && !is_x32)
error (_("Can't debug 64-bit process with 32-bit GDB"));
if (have_ptrace_getregset == -1)
{
uint64_t xstateregs[(I386_XSTATE_SSE_SIZE / sizeof (uint64_t))];
struct iovec iov;
iov.iov_base = xstateregs;
iov.iov_len = sizeof (xstateregs);
/* Check if PTRACE_GETREGSET works. */
if (ptrace (PTRACE_GETREGSET, tid,
(unsigned int) NT_X86_XSTATE, (long) &iov) < 0)
have_ptrace_getregset = 0;
else
{
have_ptrace_getregset = 1;
/* Get XCR0 from XSAVE extended state. */
xcr0 = xstateregs[(I386_LINUX_XSAVE_XCR0_OFFSET
/ sizeof (uint64_t))];
}
}
/* Check the native XCR0 only if PTRACE_GETREGSET is available. */
if (have_ptrace_getregset
&& (xcr0 & I386_XSTATE_AVX_MASK) == I386_XSTATE_AVX_MASK)
{
if (is_64bit)
{
if (is_x32)
return tdesc_x32_avx_linux;
else
return tdesc_amd64_avx_linux;
}
else
return tdesc_i386_avx_linux;
}
else
{
if (is_64bit)
{
if (is_x32)
return tdesc_x32_linux;
else
return tdesc_amd64_linux;
}
else
return tdesc_i386_linux;
}
}
/* Provide a prototype to silence -Wmissing-prototypes. */
void _initialize_amd64_linux_nat (void);
void
_initialize_amd64_linux_nat (void)
{
struct target_ops *t;
amd64_native_gregset32_reg_offset = amd64_linux_gregset32_reg_offset;
amd64_native_gregset32_num_regs = I386_LINUX_NUM_REGS;
amd64_native_gregset64_reg_offset = amd64_linux_gregset_reg_offset;
amd64_native_gregset64_num_regs = AMD64_LINUX_NUM_REGS;
gdb_assert (ARRAY_SIZE (amd64_linux_gregset32_reg_offset)
== amd64_native_gregset32_num_regs);
/* Fill in the generic GNU/Linux methods. */
t = linux_target ();
i386_use_watchpoints (t);
i386_dr_low.set_control = amd64_linux_dr_set_control;
i386_dr_low.set_addr = amd64_linux_dr_set_addr;
i386_dr_low.get_addr = amd64_linux_dr_get_addr;
i386_dr_low.get_status = amd64_linux_dr_get_status;
i386_dr_low.get_control = amd64_linux_dr_get_control;
i386_set_debug_register_length (8);
/* Override the GNU/Linux inferior startup hook. */
super_post_startup_inferior = t->to_post_startup_inferior;
t->to_post_startup_inferior = amd64_linux_child_post_startup_inferior;
/* Add our register access methods. */
t->to_fetch_registers = amd64_linux_fetch_inferior_registers;
t->to_store_registers = amd64_linux_store_inferior_registers;
t->to_read_description = amd64_linux_read_description;
/* Register the target. */
linux_nat_add_target (t);
linux_nat_set_new_thread (t, amd64_linux_new_thread);
linux_nat_set_siginfo_fixup (t, amd64_linux_siginfo_fixup);
linux_nat_set_prepare_to_resume (t, amd64_linux_prepare_to_resume);
}
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