[deliverable/binutils-gdb.git] / gdb / amd64-fbsd-nat.c

/* Native-dependent code for FreeBSD/amd64.

   Copyright (C) 2003-2017 Free Software Foundation, Inc.

   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 "regcache.h"
#include "target.h"

#include <signal.h>
#include <sys/types.h>
#include <sys/ptrace.h>
#include <sys/sysctl.h>
#include <sys/user.h>
#include <machine/reg.h>

#include "fbsd-nat.h"
#include "amd64-tdep.h"
#include "amd64-nat.h"
#include "x86-bsd-nat.h"
#include "x86-nat.h"
#include "x86-xstate.h"
\f

/* Offset in `struct reg' where MEMBER is stored.  */
#define REG_OFFSET(member) offsetof (struct reg, member)

/* At amd64fbsd64_r_reg_offset[REGNUM] you'll find the offset in
   `struct reg' location where the GDB register REGNUM is stored.
   Unsupported registers are marked with `-1'.  */
static int amd64fbsd64_r_reg_offset[] =
{
  REG_OFFSET (r_rax),
  REG_OFFSET (r_rbx),
  REG_OFFSET (r_rcx),
  REG_OFFSET (r_rdx),
  REG_OFFSET (r_rsi),
  REG_OFFSET (r_rdi),
  REG_OFFSET (r_rbp),
  REG_OFFSET (r_rsp),
  REG_OFFSET (r_r8),
  REG_OFFSET (r_r9),
  REG_OFFSET (r_r10),
  REG_OFFSET (r_r11),
  REG_OFFSET (r_r12),
  REG_OFFSET (r_r13),
  REG_OFFSET (r_r14),
  REG_OFFSET (r_r15),
  REG_OFFSET (r_rip),
  REG_OFFSET (r_rflags),
  REG_OFFSET (r_cs),
  REG_OFFSET (r_ss),
  -1,
  -1,
  -1,
  -1
};
\f

/* Mapping between the general-purpose registers in FreeBSD/amd64
   `struct reg' format and GDB's register cache layout for
   FreeBSD/i386.

   Note that most FreeBSD/amd64 registers are 64-bit, while the
   FreeBSD/i386 registers are all 32-bit, but since we're
   little-endian we get away with that.  */

/* From <machine/reg.h>.  */
static int amd64fbsd32_r_reg_offset[I386_NUM_GREGS] =
{
  14 * 8, 13 * 8,		/* %eax, %ecx */
  12 * 8, 11 * 8,		/* %edx, %ebx */
  20 * 8, 10 * 8,		/* %esp, %ebp */
  9 * 8, 8 * 8,			/* %esi, %edi */
  17 * 8, 19 * 8,		/* %eip, %eflags */
  18 * 8, 21 * 8,		/* %cs, %ss */
  -1, -1, -1, -1		/* %ds, %es, %fs, %gs */
};
\f

/* Support for debugging kernel virtual memory images.  */

#include <machine/pcb.h>
#include <osreldate.h>

#include "bsd-kvm.h"

static int
amd64fbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
{
  /* The following is true for FreeBSD 5.2:

     The pcb contains %rip, %rbx, %rsp, %rbp, %r12, %r13, %r14, %r15,
     %ds, %es, %fs and %gs.  This accounts for all callee-saved
     registers specified by the psABI and then some.  Here %esp
     contains the stack pointer at the point just after the call to
     cpu_switch().  From this information we reconstruct the register
     state as it would like when we just returned from cpu_switch().  */

  /* The stack pointer shouldn't be zero.  */
  if (pcb->pcb_rsp == 0)
    return 0;

  pcb->pcb_rsp += 8;
  regcache_raw_supply (regcache, AMD64_RIP_REGNUM, &pcb->pcb_rip);
  regcache_raw_supply (regcache, AMD64_RBX_REGNUM, &pcb->pcb_rbx);
  regcache_raw_supply (regcache, AMD64_RSP_REGNUM, &pcb->pcb_rsp);
  regcache_raw_supply (regcache, AMD64_RBP_REGNUM, &pcb->pcb_rbp);
  regcache_raw_supply (regcache, 12, &pcb->pcb_r12);
  regcache_raw_supply (regcache, 13, &pcb->pcb_r13);
  regcache_raw_supply (regcache, 14, &pcb->pcb_r14);
  regcache_raw_supply (regcache, 15, &pcb->pcb_r15);
#if (__FreeBSD_version < 800075) && (__FreeBSD_kernel_version < 800075)
  /* struct pcb provides the pcb_ds/pcb_es/pcb_fs/pcb_gs fields only
     up until __FreeBSD_version 800074: The removal of these fields
     occurred on 2009-04-01 while the __FreeBSD_version number was
     bumped to 800075 on 2009-04-06.  So 800075 is the closest version
     number where we should not try to access these fields.  */
  regcache_raw_supply (regcache, AMD64_DS_REGNUM, &pcb->pcb_ds);
  regcache_raw_supply (regcache, AMD64_ES_REGNUM, &pcb->pcb_es);
  regcache_raw_supply (regcache, AMD64_FS_REGNUM, &pcb->pcb_fs);
  regcache_raw_supply (regcache, AMD64_GS_REGNUM, &pcb->pcb_gs);
#endif

  return 1;
}
\f

/* Implement the to_read_description method.  */

static const struct target_desc *
amd64fbsd_read_description (struct target_ops *ops)
{
#ifdef PT_GETXSTATE_INFO
  static int xsave_probed;
  static uint64_t xcr0;
#endif
  struct reg regs;
  int is64;

  if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid),
	      (PTRACE_TYPE_ARG3) &regs, 0) == -1)
    perror_with_name (_("Couldn't get registers"));
  is64 = (regs.r_cs == GSEL (GUCODE_SEL, SEL_UPL));
#ifdef PT_GETXSTATE_INFO
  if (!xsave_probed)
    {
      struct ptrace_xstate_info info;

      if (ptrace (PT_GETXSTATE_INFO, ptid_get_pid (inferior_ptid),
		  (PTRACE_TYPE_ARG3) &info, sizeof (info)) == 0)
	{
	  x86bsd_xsave_len = info.xsave_len;
	  xcr0 = info.xsave_mask;
	}
      xsave_probed = 1;
    }

  if (x86bsd_xsave_len != 0)
    {
      if (is64)
	return amd64_target_description (xcr0);
      else
	return i386_target_description (xcr0);
    }
#endif
  if (is64)
    return amd64_target_description (X86_XSTATE_SSE_MASK);
  else
    return i386_target_description (X86_XSTATE_SSE_MASK);
}

/* Provide a prototype to silence -Wmissing-prototypes.  */
void _initialize_amd64fbsd_nat (void);

void
_initialize_amd64fbsd_nat (void)
{
  struct target_ops *t;
  int offset;

  amd64_native_gregset32_reg_offset = amd64fbsd32_r_reg_offset;
  amd64_native_gregset64_reg_offset = amd64fbsd64_r_reg_offset;

  /* Add some extra features to the common *BSD/i386 target.  */
  t = amd64bsd_target ();
  t->to_read_description = amd64fbsd_read_description;

  fbsd_nat_add_target (t);

  /* Support debugging kernel virtual memory images.  */
  bsd_kvm_add_target (amd64fbsd_supply_pcb);

  /* To support the recognition of signal handlers, i386-bsd-tdep.c
     hardcodes some constants.  Inclusion of this file means that we
     are compiling a native debugger, which means that we can use the
     system header files and sysctl(3) to get at the relevant
     information.  */

#define SC_REG_OFFSET amd64fbsd_sc_reg_offset

  /* We only check the program counter, stack pointer and frame
     pointer since these members of `struct sigcontext' are essential
     for providing backtraces.  */

#define SC_RIP_OFFSET SC_REG_OFFSET[AMD64_RIP_REGNUM]
#define SC_RSP_OFFSET SC_REG_OFFSET[AMD64_RSP_REGNUM]
#define SC_RBP_OFFSET SC_REG_OFFSET[AMD64_RBP_REGNUM]

  /* Override the default value for the offset of the program counter
     in the sigcontext structure.  */
  offset = offsetof (struct sigcontext, sc_rip);

  if (SC_RIP_OFFSET != offset)
    {
      warning (_("\
offsetof (struct sigcontext, sc_rip) yields %d instead of %d.\n\
Please report this to <bug-gdb@gnu.org>."),
	       offset, SC_RIP_OFFSET);
    }

  SC_RIP_OFFSET = offset;

  /* Likewise for the stack pointer.  */
  offset = offsetof (struct sigcontext, sc_rsp);

  if (SC_RSP_OFFSET != offset)
    {
      warning (_("\
offsetof (struct sigcontext, sc_rsp) yields %d instead of %d.\n\
Please report this to <bug-gdb@gnu.org>."),
	       offset, SC_RSP_OFFSET);
    }

  SC_RSP_OFFSET = offset;

  /* And the frame pointer.  */
  offset = offsetof (struct sigcontext, sc_rbp);

  if (SC_RBP_OFFSET != offset)
    {
      warning (_("\
offsetof (struct sigcontext, sc_rbp) yields %d instead of %d.\n\
Please report this to <bug-gdb@gnu.org>."),
	       offset, SC_RBP_OFFSET);
    }

  SC_RBP_OFFSET = offset;

#ifdef KERN_PROC_SIGTRAMP
  /* Normally signal frames are detected via amd64fbsd_sigtramp_p.
     However, FreeBSD 9.2 through 10.1 do not include the page holding
     the signal code in core dumps.  These releases do provide a
     kern.proc.sigtramp.<pid> sysctl that returns the location of the
     signal trampoline for a running process.  We fetch the location
     of the current (gdb) process and use this to identify signal
     frames in core dumps from these releases.  Note that this only
     works for core dumps of 64-bit (FreeBSD/amd64) processes and does
     not handle core dumps of 32-bit (FreeBSD/i386) processes.  */
  {
    int mib[4];
    struct kinfo_sigtramp kst;
    size_t len;

    mib[0] = CTL_KERN;
    mib[1] = KERN_PROC;
    mib[2] = KERN_PROC_SIGTRAMP;
    mib[3] = getpid ();
    len = sizeof (kst);
    if (sysctl (mib, 4, &kst, &len, NULL, 0) == 0)
      {
	amd64fbsd_sigtramp_start_addr = (uintptr_t) kst.ksigtramp_start;
	amd64fbsd_sigtramp_end_addr = (uintptr_t) kst.ksigtramp_end;
      }
  }
#endif
}
Commit	Line	Data
68cc0bfb	1	/* Native-dependent code for FreeBSD/amd64.
2a6d284d	2
61baf725	3	Copyright (C) 2003-2017 Free Software Foundation, Inc.
68cc0bfb MK	4
	5	This file is part of GDB.
	6
	7	This program is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
a9762ec7	9	the Free Software Foundation; either version 3 of the License, or
68cc0bfb MK	10	(at your option) any later version.
	11
	12	This program is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
a9762ec7	18	along with this program. If not, see <http://www.gnu.org/licenses/>. */
68cc0bfb MK	19
	20	#include "defs.h"
	21	#include "inferior.h"
	22	#include "regcache.h"
6a5c78a3	23	#include "target.h"
68cc0bfb	24
68cc0bfb	25	#include <signal.h>
68cc0bfb MK	26	#include <sys/types.h>
	27	#include <sys/ptrace.h>
	28	#include <sys/sysctl.h>
cf424aef	29	#include <sys/user.h>
68cc0bfb MK	30	#include <machine/reg.h>
68cc0bfb MK	31
6a5c78a3	32	#include "fbsd-nat.h"
85be1ca6	33	#include "amd64-tdep.h"
2a6d284d	34	#include "amd64-nat.h"
03b62bbb	35	#include "x86-bsd-nat.h"
df7e5265	36	#include "x86-nat.h"
26562e73	37	#include "x86-xstate.h"
68cc0bfb MK	38	\f
68cc0bfb MK	39
cb461069 MK	40	/* Offset in `struct reg' where MEMBER is stored. */
cb461069 MK	41	#define REG_OFFSET(member) offsetof (struct reg, member)
68cc0bfb	42
cb461069 MK	43	/* At amd64fbsd64_r_reg_offset[REGNUM] you'll find the offset in
	44	`struct reg' location where the GDB register REGNUM is stored.
	45	Unsupported registers are marked with `-1'. */
	46	static int amd64fbsd64_r_reg_offset[] =
68cc0bfb MK	47	{
	48	REG_OFFSET (r_rax),
	49	REG_OFFSET (r_rbx),
	50	REG_OFFSET (r_rcx),
	51	REG_OFFSET (r_rdx),
	52	REG_OFFSET (r_rsi),
	53	REG_OFFSET (r_rdi),
	54	REG_OFFSET (r_rbp),
	55	REG_OFFSET (r_rsp),
	56	REG_OFFSET (r_r8),
	57	REG_OFFSET (r_r9),
	58	REG_OFFSET (r_r10),
	59	REG_OFFSET (r_r11),
	60	REG_OFFSET (r_r12),
	61	REG_OFFSET (r_r13),
	62	REG_OFFSET (r_r14),
	63	REG_OFFSET (r_r15),
	64	REG_OFFSET (r_rip),
	65	REG_OFFSET (r_rflags),
af233647 MK	66	REG_OFFSET (r_cs),
af233647 MK	67	REG_OFFSET (r_ss),
68cc0bfb MK	68	-1,
	69	-1,
	70	-1,
	71	-1
	72	};
2a6d284d MK	73	\f
	74
	75	/* Mapping between the general-purpose registers in FreeBSD/amd64
	76	`struct reg' format and GDB's register cache layout for
	77	FreeBSD/i386.
68cc0bfb	78
2a6d284d MK	79	Note that most FreeBSD/amd64 registers are 64-bit, while the
	80	FreeBSD/i386 registers are all 32-bit, but since we're
	81	little-endian we get away with that. */
68cc0bfb	82
2a6d284d MK	83	/* From <machine/reg.h>. */
	84	static int amd64fbsd32_r_reg_offset[I386_NUM_GREGS] =
	85	{
	86	14 * 8, 13 * 8, /* %eax, %ecx */
	87	12 * 8, 11 * 8, /* %edx, %ebx */
	88	20 * 8, 10 * 8, /* %esp, %ebp */
	89	9 * 8, 8 * 8, /* %esi, %edi */
	90	17 * 8, 19 * 8, /* %eip, %eflags */
	91	18 * 8, 21 * 8, /* %cs, %ss */
	92	-1, -1, -1, -1 /* %ds, %es, %fs, %gs */
	93	};
68cc0bfb MK	94	\f
68cc0bfb MK	95
315c4276 MK	96	/* Support for debugging kernel virtual memory images. */
315c4276 MK	97
315c4276	98	#include <machine/pcb.h>
1f596238	99	#include <osreldate.h>
315c4276 MK	100
	101	#include "bsd-kvm.h"
	102
	103	static int
	104	amd64fbsd_supply_pcb (struct regcache regcache, struct pcb pcb)
	105	{
	106	/* The following is true for FreeBSD 5.2:
	107
	108	The pcb contains %rip, %rbx, %rsp, %rbp, %r12, %r13, %r14, %r15,
	109	%ds, %es, %fs and %gs. This accounts for all callee-saved
	110	registers specified by the psABI and then some. Here %esp
	111	contains the stack pointer at the point just after the call to
	112	cpu_switch(). From this information we reconstruct the register
	113	state as it would like when we just returned from cpu_switch(). */
	114
	115	/* The stack pointer shouldn't be zero. */
	116	if (pcb->pcb_rsp == 0)
	117	return 0;
	118
	119	pcb->pcb_rsp += 8;
	120	regcache_raw_supply (regcache, AMD64_RIP_REGNUM, &pcb->pcb_rip);
	121	regcache_raw_supply (regcache, AMD64_RBX_REGNUM, &pcb->pcb_rbx);
	122	regcache_raw_supply (regcache, AMD64_RSP_REGNUM, &pcb->pcb_rsp);
	123	regcache_raw_supply (regcache, AMD64_RBP_REGNUM, &pcb->pcb_rbp);
	124	regcache_raw_supply (regcache, 12, &pcb->pcb_r12);
	125	regcache_raw_supply (regcache, 13, &pcb->pcb_r13);
	126	regcache_raw_supply (regcache, 14, &pcb->pcb_r14);
	127	regcache_raw_supply (regcache, 15, &pcb->pcb_r15);
c1dec97b	128	#if (__FreeBSD_version < 800075) && (__FreeBSD_kernel_version < 800075)
ffeecffa JB	129	/* struct pcb provides the pcb_ds/pcb_es/pcb_fs/pcb_gs fields only
	130	up until __FreeBSD_version 800074: The removal of these fields
	131	occurred on 2009-04-01 while the __FreeBSD_version number was
	132	bumped to 800075 on 2009-04-06. So 800075 is the closest version
	133	number where we should not try to access these fields. */
315c4276 MK	134	regcache_raw_supply (regcache, AMD64_DS_REGNUM, &pcb->pcb_ds);
	135	regcache_raw_supply (regcache, AMD64_ES_REGNUM, &pcb->pcb_es);
	136	regcache_raw_supply (regcache, AMD64_FS_REGNUM, &pcb->pcb_fs);
	137	regcache_raw_supply (regcache, AMD64_GS_REGNUM, &pcb->pcb_gs);
1f596238	138	#endif
315c4276 MK	139
	140	return 1;
	141	}
	142	\f
	143
97de3545 JB	144	/* Implement the to_read_description method. */
	145
	146	static const struct target_desc *
	147	amd64fbsd_read_description (struct target_ops *ops)
	148	{
	149	#ifdef PT_GETXSTATE_INFO
	150	static int xsave_probed;
	151	static uint64_t xcr0;
	152	#endif
	153	struct reg regs;
	154	int is64;
	155
	156	if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid),
	157	(PTRACE_TYPE_ARG3) &regs, 0) == -1)
	158	perror_with_name (_("Couldn't get registers"));
	159	is64 = (regs.r_cs == GSEL (GUCODE_SEL, SEL_UPL));
	160	#ifdef PT_GETXSTATE_INFO
	161	if (!xsave_probed)
	162	{
	163	struct ptrace_xstate_info info;
	164
	165	if (ptrace (PT_GETXSTATE_INFO, ptid_get_pid (inferior_ptid),
	166	(PTRACE_TYPE_ARG3) &info, sizeof (info)) == 0)
	167	{
a3405d12	168	x86bsd_xsave_len = info.xsave_len;
97de3545 JB	169	xcr0 = info.xsave_mask;
	170	}
	171	xsave_probed = 1;
	172	}
	173
a3405d12	174	if (x86bsd_xsave_len != 0)
97de3545 JB	175	{
	176	if (is64)
	177	return amd64_target_description (xcr0);
	178	else
	179	return i386_target_description (xcr0);
	180	}
	181	#endif
	182	if (is64)
2434b019	183	return amd64_target_description (X86_XSTATE_SSE_MASK);
97de3545	184	else
ca1fa5ee	185	return i386_target_description (X86_XSTATE_SSE_MASK);
97de3545 JB	186	}
97de3545 JB	187
68cc0bfb MK	188	/* Provide a prototype to silence -Wmissing-prototypes. */
	189	void _initialize_amd64fbsd_nat (void);
	190
	191	void
1c671366	192	_initialize_amd64fbsd_nat (void)
68cc0bfb	193	{
6a5c78a3	194	struct target_ops *t;
68cc0bfb MK	195	int offset;
68cc0bfb MK	196
2a6d284d	197	amd64_native_gregset32_reg_offset = amd64fbsd32_r_reg_offset;
cb461069	198	amd64_native_gregset64_reg_offset = amd64fbsd64_r_reg_offset;
2a6d284d	199
6a5c78a3 MK	200	/* Add some extra features to the common BSD/i386 target. /
6a5c78a3 MK	201	t = amd64bsd_target ();
97de3545	202	t->to_read_description = amd64fbsd_read_description;
26cb8b7c	203
8f60fe01	204	fbsd_nat_add_target (t);
6a5c78a3 MK	205
	206	/* Support debugging kernel virtual memory images. */
	207	bsd_kvm_add_target (amd64fbsd_supply_pcb);
	208
03b62bbb	209	/* To support the recognition of signal handlers, i386-bsd-tdep.c
68cc0bfb MK	210	hardcodes some constants. Inclusion of this file means that we
	211	are compiling a native debugger, which means that we can use the
	212	system header files and sysctl(3) to get at the relevant
	213	information. */
	214
68cc0bfb MK	215	#define SC_REG_OFFSET amd64fbsd_sc_reg_offset
	216
	217	/* We only check the program counter, stack pointer and frame
	218	pointer since these members of `struct sigcontext' are essential
	219	for providing backtraces. */
	220
90f90721 MK	221	#define SC_RIP_OFFSET SC_REG_OFFSET[AMD64_RIP_REGNUM]
	222	#define SC_RSP_OFFSET SC_REG_OFFSET[AMD64_RSP_REGNUM]
	223	#define SC_RBP_OFFSET SC_REG_OFFSET[AMD64_RBP_REGNUM]
68cc0bfb MK	224
	225	/* Override the default value for the offset of the program counter
	226	in the sigcontext structure. */
	227	offset = offsetof (struct sigcontext, sc_rip);
	228
	229	if (SC_RIP_OFFSET != offset)
	230	{
edefbb7c	231	warning (_("\
68cc0bfb	232	offsetof (struct sigcontext, sc_rip) yields %d instead of %d.\n\
edefbb7c	233	Please report this to <bug-gdb@gnu.org>."),
68cc0bfb MK	234	offset, SC_RIP_OFFSET);
	235	}
	236
	237	SC_RIP_OFFSET = offset;
	238
	239	/* Likewise for the stack pointer. */
	240	offset = offsetof (struct sigcontext, sc_rsp);
	241
	242	if (SC_RSP_OFFSET != offset)
	243	{
edefbb7c	244	warning (_("\
68cc0bfb	245	offsetof (struct sigcontext, sc_rsp) yields %d instead of %d.\n\
edefbb7c	246	Please report this to <bug-gdb@gnu.org>."),
68cc0bfb MK	247	offset, SC_RSP_OFFSET);
	248	}
	249
	250	SC_RSP_OFFSET = offset;
	251
	252	/* And the frame pointer. */
	253	offset = offsetof (struct sigcontext, sc_rbp);
	254
	255	if (SC_RBP_OFFSET != offset)
	256	{
edefbb7c	257	warning (_("\
68cc0bfb	258	offsetof (struct sigcontext, sc_rbp) yields %d instead of %d.\n\
edefbb7c	259	Please report this to <bug-gdb@gnu.org>."),
68cc0bfb MK	260	offset, SC_RBP_OFFSET);
	261	}
	262
	263	SC_RBP_OFFSET = offset;
	264
cf424aef JB	265	#ifdef KERN_PROC_SIGTRAMP
	266	/* Normally signal frames are detected via amd64fbsd_sigtramp_p.
	267	However, FreeBSD 9.2 through 10.1 do not include the page holding
	268	the signal code in core dumps. These releases do provide a
	269	kern.proc.sigtramp.<pid> sysctl that returns the location of the
	270	signal trampoline for a running process. We fetch the location
	271	of the current (gdb) process and use this to identify signal
	272	frames in core dumps from these releases. Note that this only
	273	works for core dumps of 64-bit (FreeBSD/amd64) processes and does
	274	not handle core dumps of 32-bit (FreeBSD/i386) processes. */
68cc0bfb	275	{
cf424aef JB	276	int mib[4];
cf424aef JB	277	struct kinfo_sigtramp kst;
68cc0bfb MK	278	size_t len;
68cc0bfb MK	279
68cc0bfb	280	mib[0] = CTL_KERN;
cf424aef JB	281	mib[1] = KERN_PROC;
	282	mib[2] = KERN_PROC_SIGTRAMP;
	283	mib[3] = getpid ();
	284	len = sizeof (kst);
	285	if (sysctl (mib, 4, &kst, &len, NULL, 0) == 0)
68cc0bfb	286	{
cf424aef JB	287	amd64fbsd_sigtramp_start_addr = (uintptr_t) kst.ksigtramp_start;
cf424aef JB	288	amd64fbsd_sigtramp_end_addr = (uintptr_t) kst.ksigtramp_end;
68cc0bfb MK	289	}
68cc0bfb MK	290	}
cf424aef	291	#endif
68cc0bfb	292	}