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/* Native-dependent code for modern i386 BSD's.
 
   Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008
   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 "gdb_assert.h"
#include <signal.h>
#include <stddef.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"
 
 
/* 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
 
 
/* Supply the general-purpose registers in GREGS, to REGCACHE.  */
 
static void
i386bsd_supply_gregset (struct regcache *regcache, const void *gregs)
{
  const char *regs = 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 = 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 regcache *regcache, int regnum)
{
  if (regnum == -1 || GETREGS_SUPPLIES (regnum))
    {
      struct reg regs;
 
      if (ptrace (PT_GETREGS, PIDGET (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];
 
      if (have_ptrace_xmmregs != 0
          && ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),
                    (PTRACE_TYPE_ARG3) xmmregs, 0) == 0)
        {
          have_ptrace_xmmregs = 1;
          i387_supply_fxsave (regcache, -1, xmmregs);
        }
      else
        {
          if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
                      (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
            perror_with_name (_("Couldn't get floating point status"));
 
          i387_supply_fsave (regcache, -1, &fpregs);
        }
#else
      if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
                  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
        perror_with_name (_("Couldn't get floating point status"));
 
      i387_supply_fsave (regcache, -1, &fpregs);
#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 regcache *regcache, int regnum)
{
  if (regnum == -1 || GETREGS_SUPPLIES (regnum))
    {
      struct reg regs;
 
      if (ptrace (PT_GETREGS, PIDGET (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, PIDGET (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];
 
      if (have_ptrace_xmmregs != 0
          && ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),
                    (PTRACE_TYPE_ARG3) xmmregs, 0) == 0)
        {
          have_ptrace_xmmregs = 1;
 
          i387_collect_fxsave (regcache, regnum, xmmregs);
 
          if (ptrace (PT_SETXMMREGS, PIDGET (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, PIDGET (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, PIDGET (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;
}
 
 
/* 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 void
i386bsd_dr_set (int regnum, unsigned int value)
{
  struct dbreg dbregs;
 
  if (ptrace (PT_GETDBREGS, PIDGET (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, PIDGET (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);
}
 
void
i386bsd_dr_reset_addr (int regnum)
{
  gdb_assert (regnum >= 0 && regnum <= 4);
 
  i386bsd_dr_set (regnum, 0);
}
 
unsigned long
i386bsd_dr_get_status (void)
{
  struct dbreg dbregs;
 
  /* FIXME: kettenis/2001-03-31: 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 vector.  For now, just return zero if the
     ptrace call fails.  */
  if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
              (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
#if 0
    perror_with_name (_("Couldn't read debug registers"));
#else
    return 0;
#endif
 
  return DBREG_DRX ((&dbregs), 6);
}
 
#endif /* PT_GETDBREGS */
 
 
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 */
}

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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-6.8/] [gdb/] [i386bsd-nat.c] - Blame information for rev 840

Line No.	Rev	Author	Line
1	24	jeremybenn	`/* Native-dependent code for modern i386 BSD's.`
2
3			`Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008`
4			`Free Software Foundation, Inc.`
5
6			`This file is part of GDB.`
7
8			`This program is free software; you can redistribute it and/or modify`
9			`it under the terms of the GNU General Public License as published by`
10			`the Free Software Foundation; either version 3 of the License, or`
11			`(at your option) any later version.`
12
13			`This program is distributed in the hope that it will be useful,`
14			`but WITHOUT ANY WARRANTY; without even the implied warranty of`
15			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the`
16			`GNU General Public License for more details.`
17
18			`You should have received a copy of the GNU General Public License`
19			`along with this program. If not, see <http://www.gnu.org/licenses/>. */`
20
21			`#include "defs.h"`
22			`#include "inferior.h"`
23			`#include "regcache.h"`
24
25			`#include "gdb_assert.h"`
26			`#include <signal.h>`
27			`#include <stddef.h>`
28			`#include <sys/types.h>`
29			`#include <sys/ptrace.h>`
30			`#include <machine/reg.h>`
31			`#include <machine/frame.h>`
32
33			`#include "i386-tdep.h"`
34			`#include "i387-tdep.h"`
35			`#include "i386bsd-nat.h"`
36			`#include "inf-ptrace.h"`
37
38
39			`/* In older BSD versions we cannot get at some of the segment`
40			`registers. FreeBSD for example didn't support the %fs and %gs`
41			`registers until the 3.0 release. We have autoconf checks for their`
42			`presence, and deal gracefully with their absence. */`
43
44			/* Offset in `struct reg' where MEMBER is stored. */
45			`#define REG_OFFSET(member) offsetof (struct reg, member)`
46
47			/* At i386bsd_reg_offset[REGNUM] you'll find the offset in `struct
48			`reg' where the GDB register REGNUM is stored. Unsupported`
49			registers are marked with `-1'. */
50			`static int i386bsd_r_reg_offset[] =`
51			`{`
52			`REG_OFFSET (r_eax),`
53			`REG_OFFSET (r_ecx),`
54			`REG_OFFSET (r_edx),`
55			`REG_OFFSET (r_ebx),`
56			`REG_OFFSET (r_esp),`
57			`REG_OFFSET (r_ebp),`
58			`REG_OFFSET (r_esi),`
59			`REG_OFFSET (r_edi),`
60			`REG_OFFSET (r_eip),`
61			`REG_OFFSET (r_eflags),`
62			`REG_OFFSET (r_cs),`
63			`REG_OFFSET (r_ss),`
64			`REG_OFFSET (r_ds),`
65			`REG_OFFSET (r_es),`
66			`#ifdef HAVE_STRUCT_REG_R_FS`
67			`REG_OFFSET (r_fs),`
68			`#else`
69			`-1,`
70			`#endif`
71			`#ifdef HAVE_STRUCT_REG_R_GS`
72			`REG_OFFSET (r_gs)`
73			`#else`
74			`-1`
75			`#endif`
76			`};`
77
78			`/* Macro to determine if a register is fetched with PT_GETREGS. */`
79			`#define GETREGS_SUPPLIES(regnum) \`
80			`((0 <= (regnum) && (regnum) <= 15))`
81
82			`#ifdef HAVE_PT_GETXMMREGS`
83			`/* Set to 1 if the kernel supports PT_GETXMMREGS. Initialized to -1`
84			`so that we try PT_GETXMMREGS the first time around. */`
85			`static int have_ptrace_xmmregs = -1;`
86			`#endif`
87
88
89			`/* Supply the general-purpose registers in GREGS, to REGCACHE. */`
90
91			`static void`
92			`i386bsd_supply_gregset (struct regcache regcache, const void gregs)`
93			`{`
94			`const char *regs = gregs;`
95			`int regnum;`
96
97			`for (regnum = 0; regnum < ARRAY_SIZE (i386bsd_r_reg_offset); regnum++)`
98			`{`
99			`int offset = i386bsd_r_reg_offset[regnum];`
100
101			`if (offset != -1)`
102			`regcache_raw_supply (regcache, regnum, regs + offset);`
103			`}`
104			`}`
105
106			`/* Collect register REGNUM from REGCACHE and store its contents in`
107			`GREGS. If REGNUM is -1, collect and store all appropriate`
108			`registers. */`
109
110			`static void`
111			`i386bsd_collect_gregset (const struct regcache *regcache,`
112			`void *gregs, int regnum)`
113			`{`
114			`char *regs = gregs;`
115			`int i;`
116
117			`for (i = 0; i < ARRAY_SIZE (i386bsd_r_reg_offset); i++)`
118			`{`
119			`if (regnum == -1 \|\| regnum == i)`
120			`{`
121			`int offset = i386bsd_r_reg_offset[i];`
122
123			`if (offset != -1)`
124			`regcache_raw_collect (regcache, i, regs + offset);`
125			`}`
126			`}`
127			`}`
128
129			`/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this`
130			`for all registers (including the floating point registers). */`
131
132			`static void`
133			`i386bsd_fetch_inferior_registers (struct regcache *regcache, int regnum)`
134			`{`
135			`if (regnum == -1 \|\| GETREGS_SUPPLIES (regnum))`
136			`{`
137			`struct reg regs;`
138
139			`if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),`
140			`(PTRACE_TYPE_ARG3) &regs, 0) == -1)`
141			`perror_with_name (_("Couldn't get registers"));`
142
143			`i386bsd_supply_gregset (regcache, &regs);`
144			`if (regnum != -1)`
145			`return;`
146			`}`
147
148			`if (regnum == -1 \|\| regnum >= I386_ST0_REGNUM)`
149			`{`
150			`struct fpreg fpregs;`
151			`#ifdef HAVE_PT_GETXMMREGS`
152			`char xmmregs[512];`
153
154			`if (have_ptrace_xmmregs != 0`
155			`&& ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),`
156			`(PTRACE_TYPE_ARG3) xmmregs, 0) == 0)`
157			`{`
158			`have_ptrace_xmmregs = 1;`
159			`i387_supply_fxsave (regcache, -1, xmmregs);`
160			`}`
161			`else`
162			`{`
163			`if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),`
164			`(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)`
165			`perror_with_name (_("Couldn't get floating point status"));`
166
167			`i387_supply_fsave (regcache, -1, &fpregs);`
168			`}`
169			`#else`
170			`if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),`
171			`(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)`
172			`perror_with_name (_("Couldn't get floating point status"));`
173
174			`i387_supply_fsave (regcache, -1, &fpregs);`
175			`#endif`
176			`}`
177			`}`
178
179			`/* Store register REGNUM back into the inferior. If REGNUM is -1, do`
180			`this for all registers (including the floating point registers). */`
181
182			`static void`
183			`i386bsd_store_inferior_registers (struct regcache *regcache, int regnum)`
184			`{`
185			`if (regnum == -1 \|\| GETREGS_SUPPLIES (regnum))`
186			`{`
187			`struct reg regs;`
188
189			`if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),`
190			`(PTRACE_TYPE_ARG3) &regs, 0) == -1)`
191			`perror_with_name (_("Couldn't get registers"));`
192
193			`i386bsd_collect_gregset (regcache, &regs, regnum);`
194
195			`if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),`
196			`(PTRACE_TYPE_ARG3) &regs, 0) == -1)`
197			`perror_with_name (_("Couldn't write registers"));`
198
199			`if (regnum != -1)`
200			`return;`
201			`}`
202
203			`if (regnum == -1 \|\| regnum >= I386_ST0_REGNUM)`
204			`{`
205			`struct fpreg fpregs;`
206			`#ifdef HAVE_PT_GETXMMREGS`
207			`char xmmregs[512];`
208
209			`if (have_ptrace_xmmregs != 0`
210			`&& ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid),`
211			`(PTRACE_TYPE_ARG3) xmmregs, 0) == 0)`
212			`{`
213			`have_ptrace_xmmregs = 1;`
214
215			`i387_collect_fxsave (regcache, regnum, xmmregs);`
216
217			`if (ptrace (PT_SETXMMREGS, PIDGET (inferior_ptid),`
218			`(PTRACE_TYPE_ARG3) xmmregs, 0) == -1)`
219			`perror_with_name (_("Couldn't write XMM registers"));`
220			`}`
221			`else`
222			`{`
223			`have_ptrace_xmmregs = 0;`
224			`#endif`
225			`if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),`
226			`(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)`
227			`perror_with_name (_("Couldn't get floating point status"));`
228
229			`i387_collect_fsave (regcache, regnum, &fpregs);`
230
231			`if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),`
232			`(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)`
233			`perror_with_name (_("Couldn't write floating point status"));`
234			`#ifdef HAVE_PT_GETXMMREGS`
235			`}`
236			`#endif`
237			`}`
238			`}`
239
240			`/* Create a prototype *BSD/i386 target. The client can override it`
241			`with local methods. */`
242
243			`struct target_ops *`
244			`i386bsd_target (void)`
245			`{`
246			`struct target_ops *t;`
247
248			`t = inf_ptrace_target ();`
249			`t->to_fetch_registers = i386bsd_fetch_inferior_registers;`
250			`t->to_store_registers = i386bsd_store_inferior_registers;`
251			`return t;`
252			`}`
253
254
255			`/* Support for debug registers. */`
256
257			`#ifdef HAVE_PT_GETDBREGS`
258
259			`/* Not all versions of FreeBSD/i386 that support the debug registers`
260			`have this macro. */`
261			`#ifndef DBREG_DRX`
262			`#define DBREG_DRX(d, x) ((&d->dr0)[x])`
263			`#endif`
264
265			`static void`
266			`i386bsd_dr_set (int regnum, unsigned int value)`
267			`{`
268			`struct dbreg dbregs;`
269
270			`if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),`
271			`(PTRACE_TYPE_ARG3) &dbregs, 0) == -1)`
272			`perror_with_name (_("Couldn't get debug registers"));`
273
274			`/* For some mysterious reason, some of the reserved bits in the`
275			`debug control register get set. Mask these off, otherwise the`
276			`ptrace call below will fail. */`
277			`DBREG_DRX ((&dbregs), 7) &= ~(0x0000fc00);`
278
279			`DBREG_DRX ((&dbregs), regnum) = value;`
280
281			`if (ptrace (PT_SETDBREGS, PIDGET (inferior_ptid),`
282			`(PTRACE_TYPE_ARG3) &dbregs, 0) == -1)`
283			`perror_with_name (_("Couldn't write debug registers"));`
284			`}`
285
286			`void`
287			`i386bsd_dr_set_control (unsigned long control)`
288			`{`
289			`i386bsd_dr_set (7, control);`
290			`}`
291
292			`void`
293			`i386bsd_dr_set_addr (int regnum, CORE_ADDR addr)`
294			`{`
295			`gdb_assert (regnum >= 0 && regnum <= 4);`
296
297			`i386bsd_dr_set (regnum, addr);`
298			`}`
299
300			`void`
301			`i386bsd_dr_reset_addr (int regnum)`
302			`{`
303			`gdb_assert (regnum >= 0 && regnum <= 4);`
304
305			`i386bsd_dr_set (regnum, 0);`
306			`}`
307
308			`unsigned long`
309			`i386bsd_dr_get_status (void)`
310			`{`
311			`struct dbreg dbregs;`
312
313			`/* FIXME: kettenis/2001-03-31: Calling perror_with_name if the`
314			`ptrace call fails breaks debugging remote targets. The correct`
315			`way to fix this is to add the hardware breakpoint and watchpoint`
316			`stuff to the target vector. For now, just return zero if the`
317			`ptrace call fails. */`
318			`if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),`
319			`(PTRACE_TYPE_ARG3) &dbregs, 0) == -1)`
320			`#if 0`
321			`perror_with_name (_("Couldn't read debug registers"));`
322			`#else`
323			`return 0;`
324			`#endif`
325
326			`return DBREG_DRX ((&dbregs), 6);`
327			`}`
328
329			`#endif /* PT_GETDBREGS */`
330
331
332			`void`
333			`_initialize_i386bsd_nat (void)`
334			`{`
335			`int offset;`
336
337			`/* To support the recognition of signal handlers, i386bsd-tdep.c`
338			`hardcodes some constants. Inclusion of this file means that we`
339			`are compiling a native debugger, which means that we can use the`
340			`system header files and sysctl(3) to get at the relevant`
341			`information. */`
342
343			`#if defined (__FreeBSD_version) && __FreeBSD_version >= 400011`
344			`#define SC_REG_OFFSET i386fbsd4_sc_reg_offset`
345			`#elif defined (__FreeBSD_version) && __FreeBSD_version >= 300005`
346			`#define SC_REG_OFFSET i386fbsd_sc_reg_offset`
347			`#elif defined (NetBSD) \|\| defined (__NetBSD_Version__)`
348			`#define SC_REG_OFFSET i386nbsd_sc_reg_offset`
349			`#elif defined (OpenBSD)`
350			`#define SC_REG_OFFSET i386obsd_sc_reg_offset`
351			`#endif`
352
353			`#ifdef SC_REG_OFFSET`
354
355			`/* We only check the program counter, stack pointer and frame`
356			pointer since these members of `struct sigcontext' are essential
357			`for providing backtraces. More checks could be added, but would`
358			`involve adding configure checks for the appropriate structure`
359			`members, since older BSD's don't provide all of them. */`
360
361			`#define SC_PC_OFFSET SC_REG_OFFSET[I386_EIP_REGNUM]`
362			`#define SC_SP_OFFSET SC_REG_OFFSET[I386_ESP_REGNUM]`
363			`#define SC_FP_OFFSET SC_REG_OFFSET[I386_EBP_REGNUM]`
364
365			`/* Override the default value for the offset of the program counter`
366			`in the sigcontext structure. */`
367			`offset = offsetof (struct sigcontext, sc_pc);`
368
369			`if (SC_PC_OFFSET != offset)`
370			`{`
371			`warning (_("\`
372			`offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\`
373			`Please report this to <bug-gdb@gnu.org>."),`
374			`offset, SC_PC_OFFSET);`
375			`}`
376
377			`SC_PC_OFFSET = offset;`
378
379			`/* Likewise for the stack pointer. */`
380			`offset = offsetof (struct sigcontext, sc_sp);`
381
382			`if (SC_SP_OFFSET != offset)`
383			`{`
384			`warning (_("\`
385			`offsetof (struct sigcontext, sc_sp) yields %d instead of %d.\n\`
386			`Please report this to <bug-gdb@gnu.org>."),`
387			`offset, SC_SP_OFFSET);`
388			`}`
389
390			`SC_SP_OFFSET = offset;`
391
392			`/* And the frame pointer. */`
393			`offset = offsetof (struct sigcontext, sc_fp);`
394
395			`if (SC_FP_OFFSET != offset)`
396			`{`
397			`warning (_("\`
398			`offsetof (struct sigcontext, sc_fp) yields %d instead of %d.\n\`
399			`Please report this to <bug-gdb@gnu.org>."),`
400			`offset, SC_FP_OFFSET);`
401			`}`
402
403			`SC_FP_OFFSET = offset;`
404
405			`#endif /* SC_REG_OFFSET */`
406			`}`