1 /* Native-dependent code for modern i386 BSD's.
3 Copyright (C) 2000-2018 Free Software Foundation, Inc.
5 This file is part of GDB.
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
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
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.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
25 #include <sys/types.h>
26 #include <sys/ptrace.h>
27 #include <machine/reg.h>
28 #include <machine/frame.h>
30 #include "i386-tdep.h"
31 #include "i387-tdep.h"
32 #include "x86-bsd-nat.h"
33 #include "i386-bsd-nat.h"
34 #include "inf-ptrace.h"
37 /* In older BSD versions we cannot get at some of the segment
38 registers. FreeBSD for example didn't support the %fs and %gs
39 registers until the 3.0 release. We have autoconf checks for their
40 presence, and deal gracefully with their absence. */
42 /* Offset in `struct reg' where MEMBER is stored. */
43 #define REG_OFFSET(member) offsetof (struct reg, member)
45 /* At i386bsd_reg_offset[REGNUM] you'll find the offset in `struct
46 reg' where the GDB register REGNUM is stored. Unsupported
47 registers are marked with `-1'. */
48 static int i386bsd_r_reg_offset
[] =
59 REG_OFFSET (r_eflags
),
64 #ifdef HAVE_STRUCT_REG_R_FS
69 #ifdef HAVE_STRUCT_REG_R_GS
76 /* Macro to determine if a register is fetched with PT_GETREGS. */
77 #define GETREGS_SUPPLIES(regnum) \
78 ((0 <= (regnum) && (regnum) <= 15))
80 #ifdef HAVE_PT_GETXMMREGS
81 /* Set to 1 if the kernel supports PT_GETXMMREGS. Initialized to -1
82 so that we try PT_GETXMMREGS the first time around. */
83 static int have_ptrace_xmmregs
= -1;
87 /* Supply the general-purpose registers in GREGS, to REGCACHE. */
90 i386bsd_supply_gregset (struct regcache
*regcache
, const void *gregs
)
92 const char *regs
= (const char *) gregs
;
95 for (regnum
= 0; regnum
< ARRAY_SIZE (i386bsd_r_reg_offset
); regnum
++)
97 int offset
= i386bsd_r_reg_offset
[regnum
];
100 regcache
->raw_supply (regnum
, regs
+ offset
);
104 /* Collect register REGNUM from REGCACHE and store its contents in
105 GREGS. If REGNUM is -1, collect and store all appropriate
109 i386bsd_collect_gregset (const struct regcache
*regcache
,
110 void *gregs
, int regnum
)
112 char *regs
= (char *) gregs
;
115 for (i
= 0; i
< ARRAY_SIZE (i386bsd_r_reg_offset
); i
++)
117 if (regnum
== -1 || regnum
== i
)
119 int offset
= i386bsd_r_reg_offset
[i
];
122 regcache
->raw_collect (i
, regs
+ offset
);
127 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
128 for all registers (including the floating point registers). */
131 i386bsd_fetch_inferior_registers (struct regcache
*regcache
, int regnum
)
133 pid_t pid
= get_ptrace_pid (regcache
->ptid ());
135 if (regnum
== -1 || GETREGS_SUPPLIES (regnum
))
139 if (ptrace (PT_GETREGS
, pid
, (PTRACE_TYPE_ARG3
) ®s
, 0) == -1)
140 perror_with_name (_("Couldn't get registers"));
142 i386bsd_supply_gregset (regcache
, ®s
);
147 if (regnum
== -1 || regnum
>= I386_ST0_REGNUM
)
150 #ifdef HAVE_PT_GETXMMREGS
154 #ifdef PT_GETXSTATE_INFO
155 if (x86bsd_xsave_len
!= 0)
159 xstateregs
= alloca (x86bsd_xsave_len
);
160 if (ptrace (PT_GETXSTATE
, pid
,
161 (PTRACE_TYPE_ARG3
) xstateregs
, 0) == -1)
162 perror_with_name (_("Couldn't get extended state status"));
164 i387_supply_xsave (regcache
, -1, xstateregs
);
169 #ifdef HAVE_PT_GETXMMREGS
170 if (have_ptrace_xmmregs
!= 0
171 && ptrace(PT_GETXMMREGS
, pid
, (PTRACE_TYPE_ARG3
) xmmregs
, 0) == 0)
173 have_ptrace_xmmregs
= 1;
174 i387_supply_fxsave (regcache
, -1, xmmregs
);
178 have_ptrace_xmmregs
= 0;
180 if (ptrace (PT_GETFPREGS
, pid
, (PTRACE_TYPE_ARG3
) &fpregs
, 0) == -1)
181 perror_with_name (_("Couldn't get floating point status"));
183 i387_supply_fsave (regcache
, -1, &fpregs
);
184 #ifdef HAVE_PT_GETXMMREGS
190 /* Store register REGNUM back into the inferior. If REGNUM is -1, do
191 this for all registers (including the floating point registers). */
194 i386bsd_store_inferior_registers (struct regcache
*regcache
, int regnum
)
196 pid_t pid
= get_ptrace_pid (regcache
->ptid ());
198 if (regnum
== -1 || GETREGS_SUPPLIES (regnum
))
202 if (ptrace (PT_GETREGS
, pid
, (PTRACE_TYPE_ARG3
) ®s
, 0) == -1)
203 perror_with_name (_("Couldn't get registers"));
205 i386bsd_collect_gregset (regcache
, ®s
, regnum
);
207 if (ptrace (PT_SETREGS
, pid
, (PTRACE_TYPE_ARG3
) ®s
, 0) == -1)
208 perror_with_name (_("Couldn't write registers"));
214 if (regnum
== -1 || regnum
>= I386_ST0_REGNUM
)
217 #ifdef HAVE_PT_GETXMMREGS
221 #ifdef PT_GETXSTATE_INFO
222 if (x86bsd_xsave_len
!= 0)
226 xstateregs
= alloca (x86bsd_xsave_len
);
227 if (ptrace (PT_GETXSTATE
, pid
,
228 (PTRACE_TYPE_ARG3
) xstateregs
, 0) == -1)
229 perror_with_name (_("Couldn't get extended state status"));
231 i387_collect_xsave (regcache
, -1, xstateregs
, 0);
233 if (ptrace (PT_SETXSTATE
, pid
,
234 (PTRACE_TYPE_ARG3
) xstateregs
, x86bsd_xsave_len
) == -1)
235 perror_with_name (_("Couldn't write extended state status"));
240 #ifdef HAVE_PT_GETXMMREGS
241 if (have_ptrace_xmmregs
!= 0
242 && ptrace(PT_GETXMMREGS
, pid
, (PTRACE_TYPE_ARG3
) xmmregs
, 0) == 0)
244 have_ptrace_xmmregs
= 1;
246 i387_collect_fxsave (regcache
, regnum
, xmmregs
);
248 if (ptrace (PT_SETXMMREGS
, pid
, (PTRACE_TYPE_ARG3
) xmmregs
, 0) == -1)
249 perror_with_name (_("Couldn't write XMM registers"));
253 have_ptrace_xmmregs
= 0;
255 if (ptrace (PT_GETFPREGS
, pid
, (PTRACE_TYPE_ARG3
) &fpregs
, 0) == -1)
256 perror_with_name (_("Couldn't get floating point status"));
258 i387_collect_fsave (regcache
, regnum
, &fpregs
);
260 if (ptrace (PT_SETFPREGS
, pid
, (PTRACE_TYPE_ARG3
) &fpregs
, 0) == -1)
261 perror_with_name (_("Couldn't write floating point status"));
262 #ifdef HAVE_PT_GETXMMREGS
269 _initialize_i386bsd_nat (void)
273 /* To support the recognition of signal handlers, i386-bsd-tdep.c
274 hardcodes some constants. Inclusion of this file means that we
275 are compiling a native debugger, which means that we can use the
276 system header files and sysctl(3) to get at the relevant
279 #if defined (__FreeBSD_version) && __FreeBSD_version >= 400011
280 #define SC_REG_OFFSET i386fbsd4_sc_reg_offset
281 #elif defined (__FreeBSD_version) && __FreeBSD_version >= 300005
282 #define SC_REG_OFFSET i386fbsd_sc_reg_offset
283 #elif defined (NetBSD) || defined (__NetBSD_Version__)
284 #define SC_REG_OFFSET i386nbsd_sc_reg_offset
285 #elif defined (OpenBSD)
286 #define SC_REG_OFFSET i386obsd_sc_reg_offset
291 /* We only check the program counter, stack pointer and frame
292 pointer since these members of `struct sigcontext' are essential
293 for providing backtraces. More checks could be added, but would
294 involve adding configure checks for the appropriate structure
295 members, since older BSD's don't provide all of them. */
297 #define SC_PC_OFFSET SC_REG_OFFSET[I386_EIP_REGNUM]
298 #define SC_SP_OFFSET SC_REG_OFFSET[I386_ESP_REGNUM]
299 #define SC_FP_OFFSET SC_REG_OFFSET[I386_EBP_REGNUM]
301 /* Override the default value for the offset of the program counter
302 in the sigcontext structure. */
303 offset
= offsetof (struct sigcontext
, sc_pc
);
305 if (SC_PC_OFFSET
!= offset
)
308 offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\
309 Please report this to <bug-gdb@gnu.org>."),
310 offset
, SC_PC_OFFSET
);
313 SC_PC_OFFSET
= offset
;
315 /* Likewise for the stack pointer. */
316 offset
= offsetof (struct sigcontext
, sc_sp
);
318 if (SC_SP_OFFSET
!= offset
)
321 offsetof (struct sigcontext, sc_sp) yields %d instead of %d.\n\
322 Please report this to <bug-gdb@gnu.org>."),
323 offset
, SC_SP_OFFSET
);
326 SC_SP_OFFSET
= offset
;
328 /* And the frame pointer. */
329 offset
= offsetof (struct sigcontext
, sc_fp
);
331 if (SC_FP_OFFSET
!= offset
)
334 offsetof (struct sigcontext, sc_fp) yields %d instead of %d.\n\
335 Please report this to <bug-gdb@gnu.org>."),
336 offset
, SC_FP_OFFSET
);
339 SC_FP_OFFSET
= offset
;
341 #endif /* SC_REG_OFFSET */
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