[deliverable/binutils-gdb.git] / gdb / i386bsd-nat.c

/* Native-dependent code for modern i386 BSD's.

   Copyright (C) 2000-2016 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 <signal.h>
#include <sys/types.h>
#include <sys/ptrace.h>
#include <machine/reg.h>
#include <machine/frame.h>

#include "i386-tdep.h"
#include "i387-tdep.h"
#include "i386bsd-nat.h"
#include "inf-ptrace.h"
\f

/* In older BSD versions we cannot get at some of the segment
   registers.  FreeBSD for example didn't support the %fs and %gs
   registers until the 3.0 release.  We have autoconf checks for their
   presence, and deal gracefully with their absence.  */

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

/* At i386bsd_reg_offset[REGNUM] you'll find the offset in `struct
   reg' where the GDB register REGNUM is stored.  Unsupported
   registers are marked with `-1'.  */
static int i386bsd_r_reg_offset[] =
{
  REG_OFFSET (r_eax),
  REG_OFFSET (r_ecx),
  REG_OFFSET (r_edx),
  REG_OFFSET (r_ebx),
  REG_OFFSET (r_esp),
  REG_OFFSET (r_ebp),
  REG_OFFSET (r_esi),
  REG_OFFSET (r_edi),
  REG_OFFSET (r_eip),
  REG_OFFSET (r_eflags),
  REG_OFFSET (r_cs),
  REG_OFFSET (r_ss),
  REG_OFFSET (r_ds),
  REG_OFFSET (r_es),
#ifdef HAVE_STRUCT_REG_R_FS
  REG_OFFSET (r_fs),
#else
  -1,
#endif
#ifdef HAVE_STRUCT_REG_R_GS
  REG_OFFSET (r_gs)
#else
  -1
#endif
};

/* Macro to determine if a register is fetched with PT_GETREGS.  */
#define GETREGS_SUPPLIES(regnum) \
  ((0 <= (regnum) && (regnum) <= 15))

#ifdef HAVE_PT_GETXMMREGS
/* Set to 1 if the kernel supports PT_GETXMMREGS.  Initialized to -1
   so that we try PT_GETXMMREGS the first time around.  */
static int have_ptrace_xmmregs = -1;
#endif

#ifdef PT_GETXSTATE_INFO
size_t i386bsd_xsave_len;
#endif
\f

/* Supply the general-purpose registers in GREGS, to REGCACHE.  */

static void
i386bsd_supply_gregset (struct regcache *regcache, const void *gregs)
{
  const char *regs = (const char *) gregs;
  int regnum;

  for (regnum = 0; regnum < ARRAY_SIZE (i386bsd_r_reg_offset); regnum++)
    {
      int offset = i386bsd_r_reg_offset[regnum];

      if (offset != -1)
	regcache_raw_supply (regcache, regnum, regs + offset);
    }
}

/* Collect register REGNUM from REGCACHE and store its contents in
   GREGS.  If REGNUM is -1, collect and store all appropriate
   registers.  */

static void
i386bsd_collect_gregset (const struct regcache *regcache,
			 void *gregs, int regnum)
{
  char *regs = (char *) gregs;
  int i;

  for (i = 0; i < ARRAY_SIZE (i386bsd_r_reg_offset); i++)
    {
      if (regnum == -1 || regnum == i)
	{
	  int offset = i386bsd_r_reg_offset[i];

	  if (offset != -1)
	    regcache_raw_collect (regcache, i, regs + offset);
	}
    }
}

/* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
   for all registers (including the floating point registers).  */

static void
i386bsd_fetch_inferior_registers (struct target_ops *ops,
				  struct regcache *regcache, int regnum)
{
  if (regnum == -1 || GETREGS_SUPPLIES (regnum))
    {
      struct reg regs;

      if (ptrace (PT_GETREGS, get_ptrace_pid (inferior_ptid),
		  (PTRACE_TYPE_ARG3) &regs, 0) == -1)
	perror_with_name (_("Couldn't get registers"));

      i386bsd_supply_gregset (regcache, &regs);
      if (regnum != -1)
	return;
    }

  if (regnum == -1 || regnum >= I386_ST0_REGNUM)
    {
      struct fpreg fpregs;
#ifdef HAVE_PT_GETXMMREGS
      char xmmregs[512];
#endif

#ifdef PT_GETXSTATE_INFO
      if (i386bsd_xsave_len != 0)
	{
	  void *xstateregs;

	  xstateregs = alloca (i386bsd_xsave_len);
	  if (ptrace (PT_GETXSTATE, get_ptrace_pid (inferior_ptid),
		      (PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
	    perror_with_name (_("Couldn't get extended state status"));

	  i387_supply_xsave (regcache, -1, xstateregs);
	  return;
	}
#endif
      
#ifdef HAVE_PT_GETXMMREGS
      if (have_ptrace_xmmregs != 0
	  && ptrace(PT_GETXMMREGS, get_ptrace_pid (inferior_ptid),
		    (PTRACE_TYPE_ARG3) xmmregs, 0) == 0)
	{
	  have_ptrace_xmmregs = 1;
	  i387_supply_fxsave (regcache, -1, xmmregs);
	}
      else
	{
	  have_ptrace_xmmregs = 0;
#endif
          if (ptrace (PT_GETFPREGS, get_ptrace_pid (inferior_ptid),
		      (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
	    perror_with_name (_("Couldn't get floating point status"));

	  i387_supply_fsave (regcache, -1, &fpregs);
#ifdef HAVE_PT_GETXMMREGS
	}
#endif
    }
}

/* Store register REGNUM back into the inferior.  If REGNUM is -1, do
   this for all registers (including the floating point registers).  */

static void
i386bsd_store_inferior_registers (struct target_ops *ops,
				  struct regcache *regcache, int regnum)
{
  if (regnum == -1 || GETREGS_SUPPLIES (regnum))
    {
      struct reg regs;

      if (ptrace (PT_GETREGS, get_ptrace_pid (inferior_ptid),
                  (PTRACE_TYPE_ARG3) &regs, 0) == -1)
        perror_with_name (_("Couldn't get registers"));

      i386bsd_collect_gregset (regcache, &regs, regnum);

      if (ptrace (PT_SETREGS, get_ptrace_pid (inferior_ptid),
	          (PTRACE_TYPE_ARG3) &regs, 0) == -1)
        perror_with_name (_("Couldn't write registers"));

      if (regnum != -1)
	return;
    }

  if (regnum == -1 || regnum >= I386_ST0_REGNUM)
    {
      struct fpreg fpregs;
#ifdef HAVE_PT_GETXMMREGS
      char xmmregs[512];
#endif

#ifdef PT_GETXSTATE_INFO
      if (i386bsd_xsave_len != 0)
	{
	  void *xstateregs;

	  xstateregs = alloca (i386bsd_xsave_len);
	  if (ptrace (PT_GETXSTATE, get_ptrace_pid (inferior_ptid),
		      (PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
	    perror_with_name (_("Couldn't get extended state status"));

	  i387_collect_xsave (regcache, -1, xstateregs, 0);

	  if (ptrace (PT_SETXSTATE, get_ptrace_pid (inferior_ptid),
		      (PTRACE_TYPE_ARG3) xstateregs, i386bsd_xsave_len) == -1)
	    perror_with_name (_("Couldn't write extended state status"));
	  return;
	}
#endif

#ifdef HAVE_PT_GETXMMREGS
      if (have_ptrace_xmmregs != 0
	  && ptrace(PT_GETXMMREGS, get_ptrace_pid (inferior_ptid),
		    (PTRACE_TYPE_ARG3) xmmregs, 0) == 0)
	{
	  have_ptrace_xmmregs = 1;

	  i387_collect_fxsave (regcache, regnum, xmmregs);

	  if (ptrace (PT_SETXMMREGS, get_ptrace_pid (inferior_ptid),
		      (PTRACE_TYPE_ARG3) xmmregs, 0) == -1)
            perror_with_name (_("Couldn't write XMM registers"));
	}
      else
	{
	  have_ptrace_xmmregs = 0;
#endif
          if (ptrace (PT_GETFPREGS, get_ptrace_pid (inferior_ptid),
		      (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
	    perror_with_name (_("Couldn't get floating point status"));

          i387_collect_fsave (regcache, regnum, &fpregs);

          if (ptrace (PT_SETFPREGS, get_ptrace_pid (inferior_ptid),
		      (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
	    perror_with_name (_("Couldn't write floating point status"));
#ifdef HAVE_PT_GETXMMREGS
        }
#endif
    }
}

/* Create a prototype *BSD/i386 target.  The client can override it
   with local methods.  */

struct target_ops *
i386bsd_target (void)
{
  struct target_ops *t;

  t = inf_ptrace_target ();
  t->to_fetch_registers = i386bsd_fetch_inferior_registers;
  t->to_store_registers = i386bsd_store_inferior_registers;
  return t;
}
\f

/* Support for debug registers.  */

#ifdef HAVE_PT_GETDBREGS

/* Not all versions of FreeBSD/i386 that support the debug registers
   have this macro.  */
#ifndef DBREG_DRX
#define DBREG_DRX(d, x) ((&d->dr0)[x])
#endif

static unsigned long
i386bsd_dr_get (ptid_t ptid, int regnum)
{
  struct dbreg dbregs;

  if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid),
	      (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
    perror_with_name (_("Couldn't read debug registers"));

  return DBREG_DRX ((&dbregs), regnum);
}

static void
i386bsd_dr_set (int regnum, unsigned int value)
{
  struct dbreg dbregs;

  if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid),
              (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
    perror_with_name (_("Couldn't get debug registers"));

  /* For some mysterious reason, some of the reserved bits in the
     debug control register get set.  Mask these off, otherwise the
     ptrace call below will fail.  */
  DBREG_DRX ((&dbregs), 7) &= ~(0x0000fc00);

  DBREG_DRX ((&dbregs), regnum) = value;

  if (ptrace (PT_SETDBREGS, get_ptrace_pid (inferior_ptid),
              (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
    perror_with_name (_("Couldn't write debug registers"));
}

void
i386bsd_dr_set_control (unsigned long control)
{
  i386bsd_dr_set (7, control);
}

void
i386bsd_dr_set_addr (int regnum, CORE_ADDR addr)
{
  gdb_assert (regnum >= 0 && regnum <= 4);

  i386bsd_dr_set (regnum, addr);
}

CORE_ADDR
i386bsd_dr_get_addr (int regnum)
{
  return i386bsd_dr_get (inferior_ptid, regnum);
}

unsigned long
i386bsd_dr_get_status (void)
{
  return i386bsd_dr_get (inferior_ptid, 6);
}

unsigned long
i386bsd_dr_get_control (void)
{
  return i386bsd_dr_get (inferior_ptid, 7);
}

#endif /* PT_GETDBREGS */
\f

/* Provide a prototype to silence -Wmissing-prototypes.  */
void _initialize_i386bsd_nat (void);

void
_initialize_i386bsd_nat (void)
{
  int offset;

  /* To support the recognition of signal handlers, i386bsd-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.  */

#if defined (__FreeBSD_version) && __FreeBSD_version >= 400011
#define SC_REG_OFFSET i386fbsd4_sc_reg_offset
#elif defined (__FreeBSD_version) && __FreeBSD_version >= 300005
#define SC_REG_OFFSET i386fbsd_sc_reg_offset
#elif defined (NetBSD) || defined (__NetBSD_Version__)
#define SC_REG_OFFSET i386nbsd_sc_reg_offset
#elif defined (OpenBSD)
#define SC_REG_OFFSET i386obsd_sc_reg_offset
#endif

#ifdef 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.  More checks could be added, but would
     involve adding configure checks for the appropriate structure
     members, since older BSD's don't provide all of them.  */

#define SC_PC_OFFSET SC_REG_OFFSET[I386_EIP_REGNUM]
#define SC_SP_OFFSET SC_REG_OFFSET[I386_ESP_REGNUM]
#define SC_FP_OFFSET SC_REG_OFFSET[I386_EBP_REGNUM]

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

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

  SC_PC_OFFSET = offset;

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

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

  SC_SP_OFFSET = offset;

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

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

  SC_FP_OFFSET = offset;

#endif /* SC_REG_OFFSET */
}
Commit	Line	Data
e6031aeb	1	/* Native-dependent code for modern i386 BSD's.
3f63813d	2
618f726f	3	Copyright (C) 2000-2016 Free Software Foundation, Inc.
e6031aeb 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
e6031aeb 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/>. */
e6031aeb MK	19
	20	#include "defs.h"
	21	#include "inferior.h"
4e052eda	22	#include "regcache.h"
e6031aeb	23
b7247919	24	#include <signal.h>
e6031aeb MK	25	#include <sys/types.h>
	26	#include <sys/ptrace.h>
	27	#include <machine/reg.h>
	28	#include <machine/frame.h>
	29
57976e88	30	#include "i386-tdep.h"
1fc7d519	31	#include "i387-tdep.h"
9692934b MK	32	#include "i386bsd-nat.h"
9692934b MK	33	#include "inf-ptrace.h"
b051bfa4 MK	34	\f
b051bfa4 MK	35
e6031aeb MK	36	/* In older BSD versions we cannot get at some of the segment
	37	registers. FreeBSD for example didn't support the %fs and %gs
	38	registers until the 3.0 release. We have autoconf checks for their
	39	presence, and deal gracefully with their absence. */
	40
6cfb2041 MK	41	/* Offset in `struct reg' where MEMBER is stored. */
6cfb2041 MK	42	#define REG_OFFSET(member) offsetof (struct reg, member)
e6031aeb	43
6cfb2041 MK	44	/* At i386bsd_reg_offset[REGNUM] you'll find the offset in `struct
6cfb2041 MK	45	reg' where the GDB register REGNUM is stored. Unsupported
e6031aeb	46	registers are marked with `-1'. */
6cfb2041	47	static int i386bsd_r_reg_offset[] =
e6031aeb MK	48	{
	49	REG_OFFSET (r_eax),
	50	REG_OFFSET (r_ecx),
	51	REG_OFFSET (r_edx),
2c48bda3	52	REG_OFFSET (r_ebx),
e6031aeb MK	53	REG_OFFSET (r_esp),
	54	REG_OFFSET (r_ebp),
	55	REG_OFFSET (r_esi),
	56	REG_OFFSET (r_edi),
	57	REG_OFFSET (r_eip),
	58	REG_OFFSET (r_eflags),
	59	REG_OFFSET (r_cs),
	60	REG_OFFSET (r_ss),
	61	REG_OFFSET (r_ds),
	62	REG_OFFSET (r_es),
422ea4b8	63	#ifdef HAVE_STRUCT_REG_R_FS
e6031aeb MK	64	REG_OFFSET (r_fs),
	65	#else
	66	-1,
	67	#endif
422ea4b8	68	#ifdef HAVE_STRUCT_REG_R_GS
e6031aeb MK	69	REG_OFFSET (r_gs)
	70	#else
	71	-1
	72	#endif
	73	};
	74
7e89e357	75	/* Macro to determine if a register is fetched with PT_GETREGS. */
283accbc MK	76	#define GETREGS_SUPPLIES(regnum) \
283accbc MK	77	((0 <= (regnum) && (regnum) <= 15))
7e89e357 JT	78
	79	#ifdef HAVE_PT_GETXMMREGS
	80	/* Set to 1 if the kernel supports PT_GETXMMREGS. Initialized to -1
	81	so that we try PT_GETXMMREGS the first time around. */
	82	static int have_ptrace_xmmregs = -1;
	83	#endif
97de3545 JB	84
	85	#ifdef PT_GETXSTATE_INFO
	86	size_t i386bsd_xsave_len;
	87	#endif
e6031aeb MK	88	\f
e6031aeb MK	89
6cfb2041	90	/* Supply the general-purpose registers in GREGS, to REGCACHE. */
e6031aeb	91
1fc7d519	92	static void
6cfb2041	93	i386bsd_supply_gregset (struct regcache regcache, const void gregs)
e6031aeb	94	{
21002a63	95	const char regs = (const char ) gregs;
feae6502	96	int regnum;
e6031aeb	97
6cfb2041	98	for (regnum = 0; regnum < ARRAY_SIZE (i386bsd_r_reg_offset); regnum++)
e6031aeb	99	{
6cfb2041 MK	100	int offset = i386bsd_r_reg_offset[regnum];
	101
	102	if (offset != -1)
	103	regcache_raw_supply (regcache, regnum, regs + offset);
e6031aeb MK	104	}
	105	}
	106
6cfb2041 MK	107	/* Collect register REGNUM from REGCACHE and store its contents in
	108	GREGS. If REGNUM is -1, collect and store all appropriate
	109	registers. */
e6031aeb	110
1fc7d519	111	static void
6cfb2041 MK	112	i386bsd_collect_gregset (const struct regcache *regcache,
6cfb2041 MK	113	void *gregs, int regnum)
e6031aeb	114	{
21002a63	115	char regs = (char ) gregs;
e6031aeb MK	116	int i;
e6031aeb MK	117
6cfb2041 MK	118	for (i = 0; i < ARRAY_SIZE (i386bsd_r_reg_offset); i++)
	119	{
	120	if (regnum == -1 \|\| regnum == i)
	121	{
	122	int offset = i386bsd_r_reg_offset[i];
e6031aeb	123
6cfb2041 MK	124	if (offset != -1)
	125	regcache_raw_collect (regcache, i, regs + offset);
	126	}
	127	}
	128	}
e6031aeb	129
283accbc	130	/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
e6031aeb MK	131	for all registers (including the floating point registers). */
e6031aeb MK	132
9692934b	133	static void
28439f5e PA	134	i386bsd_fetch_inferior_registers (struct target_ops *ops,
28439f5e PA	135	struct regcache *regcache, int regnum)
e6031aeb	136	{
283accbc	137	if (regnum == -1 \|\| GETREGS_SUPPLIES (regnum))
7e89e357	138	{
6cfb2041	139	struct reg regs;
7e89e357	140
94309df7	141	if (ptrace (PT_GETREGS, get_ptrace_pid (inferior_ptid),
9f8e0089	142	(PTRACE_TYPE_ARG3) &regs, 0) == -1)
e2e0b3e5	143	perror_with_name (_("Couldn't get registers"));
e6031aeb	144
56be3814	145	i386bsd_supply_gregset (regcache, &regs);
283accbc	146	if (regnum != -1)
7e89e357 JT	147	return;
7e89e357 JT	148	}
e6031aeb	149
283accbc	150	if (regnum == -1 \|\| regnum >= I386_ST0_REGNUM)
e6031aeb	151	{
6cfb2041	152	struct fpreg fpregs;
7e89e357 JT	153	#ifdef HAVE_PT_GETXMMREGS
7e89e357 JT	154	char xmmregs[512];
97de3545 JB	155	#endif
	156
	157	#ifdef PT_GETXSTATE_INFO
	158	if (i386bsd_xsave_len != 0)
	159	{
21002a63	160	void *xstateregs;
97de3545 JB	161
97de3545 JB	162	xstateregs = alloca (i386bsd_xsave_len);
94309df7	163	if (ptrace (PT_GETXSTATE, get_ptrace_pid (inferior_ptid),
97de3545 JB	164	(PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
97de3545 JB	165	perror_with_name (_("Couldn't get extended state status"));
7e89e357	166
97de3545 JB	167	i387_supply_xsave (regcache, -1, xstateregs);
	168	return;
	169	}
	170	#endif
	171
	172	#ifdef HAVE_PT_GETXMMREGS
a144416f	173	if (have_ptrace_xmmregs != 0
94309df7	174	&& ptrace(PT_GETXMMREGS, get_ptrace_pid (inferior_ptid),
9f8e0089	175	(PTRACE_TYPE_ARG3) xmmregs, 0) == 0)
7e89e357 JT	176	{
7e89e357 JT	177	have_ptrace_xmmregs = 1;
56be3814	178	i387_supply_fxsave (regcache, -1, xmmregs);
7e89e357 JT	179	}
	180	else
	181	{
97de3545 JB	182	have_ptrace_xmmregs = 0;
97de3545 JB	183	#endif
94309df7	184	if (ptrace (PT_GETFPREGS, get_ptrace_pid (inferior_ptid),
9f8e0089	185	(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
e2e0b3e5	186	perror_with_name (_("Couldn't get floating point status"));
e6031aeb	187
56be3814	188	i387_supply_fsave (regcache, -1, &fpregs);
97de3545	189	#ifdef HAVE_PT_GETXMMREGS
7e89e357	190	}
7e89e357	191	#endif
e6031aeb	192	}
b051bfa4	193	}
e6031aeb	194
283accbc	195	/* Store register REGNUM back into the inferior. If REGNUM is -1, do
e6031aeb MK	196	this for all registers (including the floating point registers). */
e6031aeb MK	197
9692934b	198	static void
28439f5e PA	199	i386bsd_store_inferior_registers (struct target_ops *ops,
28439f5e PA	200	struct regcache *regcache, int regnum)
e6031aeb	201	{
283accbc	202	if (regnum == -1 \|\| GETREGS_SUPPLIES (regnum))
7e89e357	203	{
6cfb2041	204	struct reg regs;
7e89e357	205
94309df7	206	if (ptrace (PT_GETREGS, get_ptrace_pid (inferior_ptid),
9f8e0089	207	(PTRACE_TYPE_ARG3) &regs, 0) == -1)
e2e0b3e5	208	perror_with_name (_("Couldn't get registers"));
e6031aeb	209
56be3814	210	i386bsd_collect_gregset (regcache, &regs, regnum);
e6031aeb	211
94309df7	212	if (ptrace (PT_SETREGS, get_ptrace_pid (inferior_ptid),
9f8e0089	213	(PTRACE_TYPE_ARG3) &regs, 0) == -1)
e2e0b3e5	214	perror_with_name (_("Couldn't write registers"));
7e89e357	215
283accbc	216	if (regnum != -1)
7e89e357 JT	217	return;
7e89e357 JT	218	}
e6031aeb	219
283accbc	220	if (regnum == -1 \|\| regnum >= I386_ST0_REGNUM)
e6031aeb	221	{
6cfb2041	222	struct fpreg fpregs;
7e89e357 JT	223	#ifdef HAVE_PT_GETXMMREGS
7e89e357 JT	224	char xmmregs[512];
97de3545 JB	225	#endif
	226
	227	#ifdef PT_GETXSTATE_INFO
	228	if (i386bsd_xsave_len != 0)
	229	{
21002a63	230	void *xstateregs;
97de3545 JB	231
97de3545 JB	232	xstateregs = alloca (i386bsd_xsave_len);
94309df7	233	if (ptrace (PT_GETXSTATE, get_ptrace_pid (inferior_ptid),
97de3545 JB	234	(PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
97de3545 JB	235	perror_with_name (_("Couldn't get extended state status"));
e6031aeb	236
97de3545 JB	237	i387_collect_xsave (regcache, -1, xstateregs, 0);
97de3545 JB	238
94309df7	239	if (ptrace (PT_SETXSTATE, get_ptrace_pid (inferior_ptid),
97de3545 JB	240	(PTRACE_TYPE_ARG3) xstateregs, i386bsd_xsave_len) == -1)
	241	perror_with_name (_("Couldn't write extended state status"));
	242	return;
	243	}
	244	#endif
	245
	246	#ifdef HAVE_PT_GETXMMREGS
a144416f	247	if (have_ptrace_xmmregs != 0
94309df7	248	&& ptrace(PT_GETXMMREGS, get_ptrace_pid (inferior_ptid),
9f8e0089	249	(PTRACE_TYPE_ARG3) xmmregs, 0) == 0)
7e89e357 JT	250	{
	251	have_ptrace_xmmregs = 1;
	252
56be3814	253	i387_collect_fxsave (regcache, regnum, xmmregs);
e6031aeb	254
94309df7	255	if (ptrace (PT_SETXMMREGS, get_ptrace_pid (inferior_ptid),
9f8e0089	256	(PTRACE_TYPE_ARG3) xmmregs, 0) == -1)
e2e0b3e5	257	perror_with_name (_("Couldn't write XMM registers"));
7e89e357 JT	258	}
	259	else
	260	{
	261	have_ptrace_xmmregs = 0;
	262	#endif
94309df7	263	if (ptrace (PT_GETFPREGS, get_ptrace_pid (inferior_ptid),
9f8e0089	264	(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
e2e0b3e5	265	perror_with_name (_("Couldn't get floating point status"));
7e89e357	266
56be3814	267	i387_collect_fsave (regcache, regnum, &fpregs);
f5b1afdf	268
94309df7	269	if (ptrace (PT_SETFPREGS, get_ptrace_pid (inferior_ptid),
9f8e0089	270	(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
e2e0b3e5	271	perror_with_name (_("Couldn't write floating point status"));
7e89e357 JT	272	#ifdef HAVE_PT_GETXMMREGS
	273	}
	274	#endif
e6031aeb MK	275	}
e6031aeb MK	276	}
9692934b MK	277
	278	/* Create a prototype *BSD/i386 target. The client can override it
	279	with local methods. */
	280
	281	struct target_ops *
	282	i386bsd_target (void)
	283	{
	284	struct target_ops *t;
	285
	286	t = inf_ptrace_target ();
	287	t->to_fetch_registers = i386bsd_fetch_inferior_registers;
	288	t->to_store_registers = i386bsd_store_inferior_registers;
	289	return t;
	290	}
e6031aeb MK	291	\f
e6031aeb MK	292
0afdd437 MK	293	/* Support for debug registers. */
	294
	295	#ifdef HAVE_PT_GETDBREGS
	296
	297	/* Not all versions of FreeBSD/i386 that support the debug registers
	298	have this macro. */
	299	#ifndef DBREG_DRX
	300	#define DBREG_DRX(d, x) ((&d->dr0)[x])
	301	#endif
	302
7b50312a PA	303	static unsigned long
	304	i386bsd_dr_get (ptid_t ptid, int regnum)
	305	{
	306	struct dbreg dbregs;
	307
94309df7	308	if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid),
7b50312a PA	309	(PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
	310	perror_with_name (_("Couldn't read debug registers"));
	311
	312	return DBREG_DRX ((&dbregs), regnum);
	313	}
	314
0afdd437 MK	315	static void
	316	i386bsd_dr_set (int regnum, unsigned int value)
	317	{
	318	struct dbreg dbregs;
	319
94309df7	320	if (ptrace (PT_GETDBREGS, get_ptrace_pid (inferior_ptid),
9f8e0089	321	(PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
e2e0b3e5	322	perror_with_name (_("Couldn't get debug registers"));
0afdd437 MK	323
	324	/* For some mysterious reason, some of the reserved bits in the
	325	debug control register get set. Mask these off, otherwise the
	326	ptrace call below will fail. */
afdb036a	327	DBREG_DRX ((&dbregs), 7) &= ~(0x0000fc00);
0afdd437 MK	328
	329	DBREG_DRX ((&dbregs), regnum) = value;
	330
94309df7	331	if (ptrace (PT_SETDBREGS, get_ptrace_pid (inferior_ptid),
9f8e0089	332	(PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
e2e0b3e5	333	perror_with_name (_("Couldn't write debug registers"));
0afdd437 MK	334	}
	335
	336	void
	337	i386bsd_dr_set_control (unsigned long control)
	338	{
	339	i386bsd_dr_set (7, control);
	340	}
	341
	342	void
	343	i386bsd_dr_set_addr (int regnum, CORE_ADDR addr)
	344	{
	345	gdb_assert (regnum >= 0 && regnum <= 4);
	346
	347	i386bsd_dr_set (regnum, addr);
	348	}
	349
7b50312a PA	350	CORE_ADDR
7b50312a PA	351	i386bsd_dr_get_addr (int regnum)
0afdd437	352	{
7b50312a	353	return i386bsd_dr_get (inferior_ptid, regnum);
0afdd437 MK	354	}
	355
	356	unsigned long
	357	i386bsd_dr_get_status (void)
	358	{
7b50312a PA	359	return i386bsd_dr_get (inferior_ptid, 6);
7b50312a PA	360	}
0afdd437	361
7b50312a PA	362	unsigned long
	363	i386bsd_dr_get_control (void)
	364	{
	365	return i386bsd_dr_get (inferior_ptid, 7);
0afdd437 MK	366	}
	367
	368	#endif /* PT_GETDBREGS */
	369	\f
	370
15add3f5 MK	371	/* Provide a prototype to silence -Wmissing-prototypes. */
	372	void _initialize_i386bsd_nat (void);
	373
b7247919 MK	374	void
	375	_initialize_i386bsd_nat (void)
	376	{
a3386186	377	int offset;
8201327c	378
b7247919 MK	379	/* To support the recognition of signal handlers, i386bsd-tdep.c
	380	hardcodes some constants. Inclusion of this file means that we
	381	are compiling a native debugger, which means that we can use the
	382	system header files and sysctl(3) to get at the relevant
	383	information. */
	384
8201327c	385	#if defined (__FreeBSD_version) && __FreeBSD_version >= 400011
a3386186 MK	386	#define SC_REG_OFFSET i386fbsd4_sc_reg_offset
a3386186 MK	387	#elif defined (__FreeBSD_version) && __FreeBSD_version >= 300005
a3386186	388	#define SC_REG_OFFSET i386fbsd_sc_reg_offset
005328e3	389	#elif defined (NetBSD) \|\| defined (__NetBSD_Version__)
a3386186	390	#define SC_REG_OFFSET i386nbsd_sc_reg_offset
005328e3	391	#elif defined (OpenBSD)
a3386186	392	#define SC_REG_OFFSET i386obsd_sc_reg_offset
8201327c MK	393	#endif
8201327c MK	394
bbe06c74 MK	395	#ifdef SC_REG_OFFSET
bbe06c74 MK	396
a3386186 MK	397	/* We only check the program counter, stack pointer and frame
	398	pointer since these members of `struct sigcontext' are essential
	399	for providing backtraces. More checks could be added, but would
	400	involve adding configure checks for the appropriate structure
	401	members, since older BSD's don't provide all of them. */
	402
	403	#define SC_PC_OFFSET SC_REG_OFFSET[I386_EIP_REGNUM]
	404	#define SC_SP_OFFSET SC_REG_OFFSET[I386_ESP_REGNUM]
	405	#define SC_FP_OFFSET SC_REG_OFFSET[I386_EBP_REGNUM]
	406
b7247919 MK	407	/* Override the default value for the offset of the program counter
b7247919 MK	408	in the sigcontext structure. */
a3386186	409	offset = offsetof (struct sigcontext, sc_pc);
8201327c	410
a3386186	411	if (SC_PC_OFFSET != offset)
8201327c	412	{
8a3fe4f8	413	warning (_("\
8201327c	414	offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\
8a3fe4f8	415	Please report this to <bug-gdb@gnu.org>."),
a3386186	416	offset, SC_PC_OFFSET);
8201327c MK	417	}
8201327c MK	418
a3386186	419	SC_PC_OFFSET = offset;
6bff26de MK	420
6bff26de MK	421	/* Likewise for the stack pointer. */
a3386186	422	offset = offsetof (struct sigcontext, sc_sp);
6bff26de	423
a3386186	424	if (SC_SP_OFFSET != offset)
6bff26de	425	{
8a3fe4f8	426	warning (_("\
6bff26de	427	offsetof (struct sigcontext, sc_sp) yields %d instead of %d.\n\
8a3fe4f8	428	Please report this to <bug-gdb@gnu.org>."),
a3386186 MK	429	offset, SC_SP_OFFSET);
	430	}
	431
	432	SC_SP_OFFSET = offset;
	433
	434	/* And the frame pointer. */
	435	offset = offsetof (struct sigcontext, sc_fp);
	436
	437	if (SC_FP_OFFSET != offset)
	438	{
8a3fe4f8	439	warning (_("\
a3386186	440	offsetof (struct sigcontext, sc_fp) yields %d instead of %d.\n\
8a3fe4f8	441	Please report this to <bug-gdb@gnu.org>."),
a3386186	442	offset, SC_FP_OFFSET);
6bff26de MK	443	}
6bff26de MK	444
a3386186	445	SC_FP_OFFSET = offset;
bbe06c74 MK	446
bbe06c74 MK	447	#endif /* SC_REG_OFFSET */
b7247919	448	}