1 /* Native-dependent code for FreeBSD/amd64.
3 Copyright 2003 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 2 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, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
26 #include "gdb_assert.h"
29 #include <sys/types.h>
30 #include <sys/ptrace.h>
31 #include <sys/sysctl.h>
32 #include <machine/reg.h>
34 #ifdef HAVE_SYS_PROCFS_H
35 #include <sys/procfs.h>
38 #ifndef HAVE_GREGSET_T
39 typedef struct reg gregset_t
;
42 #ifndef HAVE_FPREGSET_T
43 typedef struct fpreg fpregset_t
;
47 #include "x86-64-tdep.h"
48 #include "amd64-nat.h"
51 /* Offset to the gregset_t location where REG is stored. */
52 #define REG_OFFSET(reg) offsetof (gregset_t, reg)
54 /* At reg_offset[REGNUM] you'll find the offset to the gregset_t
55 location where the GDB register REGNUM is stored. Unsupported
56 registers are marked with `-1'. */
57 static int reg_offset
[] =
76 REG_OFFSET (r_rflags
),
84 /* Mapping between the general-purpose registers in FreeBSD/amd64
85 `struct reg' format and GDB's register cache layout for
88 Note that most FreeBSD/amd64 registers are 64-bit, while the
89 FreeBSD/i386 registers are all 32-bit, but since we're
90 little-endian we get away with that. */
92 /* From <machine/reg.h>. */
93 static int amd64fbsd32_r_reg_offset
[I386_NUM_GREGS
] =
95 14 * 8, 13 * 8, /* %eax, %ecx */
96 12 * 8, 11 * 8, /* %edx, %ebx */
97 20 * 8, 10 * 8, /* %esp, %ebp */
98 9 * 8, 8 * 8, /* %esi, %edi */
99 17 * 8, 19 * 8, /* %eip, %eflags */
100 18 * 8, 21 * 8, /* %cs, %ss */
101 -1, -1, -1, -1 /* %ds, %es, %fs, %gs */
105 /* Transfering the registers between GDB, inferiors and core files. */
107 /* Fill GDB's register array with the general-purpose register values
111 supply_gregset (gregset_t
*gregsetp
)
113 amd64_supply_native_gregset (current_regcache
, gregsetp
, -1);
116 /* Fill register REGNUM (if it is a general-purpose register) in
117 *GREGSETPS with the value in GDB's register array. If REGNUM is -1,
118 do this for all registers. */
121 fill_gregset (gregset_t
*gregsetp
, int regnum
)
123 amd64_collect_native_gregset (current_regcache
, gregsetp
, regnum
);
126 /* Fill GDB's register array with the floating-point register values
130 supply_fpregset (fpregset_t
*fpregsetp
)
132 x86_64_supply_fxsave ((const char *) fpregsetp
, -1);
135 /* Fill register REGNUM (if it is a floating-point register) in
136 *FPREGSETP with the value in GDB's register array. If REGNUM is -1,
137 do this for all registers. */
140 fill_fpregset (fpregset_t
*fpregsetp
, int regnum
)
142 x86_64_fill_fxsave ((char *) fpregsetp
, regnum
);
145 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
146 for all registers (including the floating point registers). */
149 fetch_inferior_registers (int regnum
)
151 if (regnum
== -1 || amd64_native_gregset_supplies_p (regnum
))
155 if (ptrace (PT_GETREGS
, PIDGET (inferior_ptid
),
156 (PTRACE_ARG3_TYPE
) ®s
, 0) == -1)
157 perror_with_name ("Couldn't get registers");
159 amd64_supply_native_gregset (current_regcache
, ®s
, -1);
164 if (regnum
== -1 || regnum
>= FP0_REGNUM
)
168 if (ptrace (PT_GETFPREGS
, PIDGET (inferior_ptid
),
169 (PTRACE_ARG3_TYPE
) &fpregs
, 0) == -1)
170 perror_with_name ("Couldn't get floating point status");
172 x86_64_supply_fxsave ((const char *) &fpregs
, -1);
176 /* Store register REGNUM back into the inferior. If REGNUM is -1, do
177 this for all registers (including the floating point registers). */
180 store_inferior_registers (int regnum
)
182 if (regnum
== -1 || amd64_native_gregset_supplies_p (regnum
))
186 if (ptrace (PT_GETREGS
, PIDGET (inferior_ptid
),
187 (PTRACE_ARG3_TYPE
) ®s
, 0) == -1)
188 perror_with_name ("Couldn't get registers");
190 amd64_collect_native_gregset (current_regcache
, ®s
, regnum
);
192 if (ptrace (PT_SETREGS
, PIDGET (inferior_ptid
),
193 (PTRACE_ARG3_TYPE
) ®s
, 0) == -1)
194 perror_with_name ("Couldn't write registers");
200 if (regnum
== -1 || regnum
>= FP0_REGNUM
)
204 if (ptrace (PT_GETFPREGS
, PIDGET (inferior_ptid
),
205 (PTRACE_ARG3_TYPE
) &fpregs
, 0) == -1)
206 perror_with_name ("Couldn't get floating point status");
208 x86_64_fill_fxsave ((char *) &fpregs
, regnum
);
210 if (ptrace (PT_SETFPREGS
, PIDGET (inferior_ptid
),
211 (PTRACE_ARG3_TYPE
) &fpregs
, 0) == -1)
212 perror_with_name ("Couldn't write floating point status");
217 /* Provide a prototype to silence -Wmissing-prototypes. */
218 void _initialize_amd64fbsd_nat (void);
221 _initialize_am64fbsd_nat (void)
225 amd64_native_gregset32_reg_offset
= amd64fbsd32_r_reg_offset
;
226 amd64_native_gregset64_reg_offset
= reg_offset
;
228 /* To support the recognition of signal handlers, i386bsd-tdep.c
229 hardcodes some constants. Inclusion of this file means that we
230 are compiling a native debugger, which means that we can use the
231 system header files and sysctl(3) to get at the relevant
234 #define SC_REG_OFFSET amd64fbsd_sc_reg_offset
236 /* We only check the program counter, stack pointer and frame
237 pointer since these members of `struct sigcontext' are essential
238 for providing backtraces. */
240 #define SC_RIP_OFFSET SC_REG_OFFSET[X86_64_RIP_REGNUM]
241 #define SC_RSP_OFFSET SC_REG_OFFSET[X86_64_RSP_REGNUM]
242 #define SC_RBP_OFFSET SC_REG_OFFSET[X86_64_RBP_REGNUM]
244 /* Override the default value for the offset of the program counter
245 in the sigcontext structure. */
246 offset
= offsetof (struct sigcontext
, sc_rip
);
248 if (SC_RIP_OFFSET
!= offset
)
251 offsetof (struct sigcontext, sc_rip) yields %d instead of %d.\n\
252 Please report this to <bug-gdb@gnu.org>.",
253 offset
, SC_RIP_OFFSET
);
256 SC_RIP_OFFSET
= offset
;
258 /* Likewise for the stack pointer. */
259 offset
= offsetof (struct sigcontext
, sc_rsp
);
261 if (SC_RSP_OFFSET
!= offset
)
264 offsetof (struct sigcontext, sc_rsp) yields %d instead of %d.\n\
265 Please report this to <bug-gdb@gnu.org>.",
266 offset
, SC_RSP_OFFSET
);
269 SC_RSP_OFFSET
= offset
;
271 /* And the frame pointer. */
272 offset
= offsetof (struct sigcontext
, sc_rbp
);
274 if (SC_RBP_OFFSET
!= offset
)
277 offsetof (struct sigcontext, sc_rbp) yields %d instead of %d.\n\
278 Please report this to <bug-gdb@gnu.org>.",
279 offset
, SC_RBP_OFFSET
);
282 SC_RBP_OFFSET
= offset
;
284 /* FreeBSD provides a kern.ps_strings sysctl that we can use to
285 locate the sigtramp. That way we can still recognize a sigtramp
286 if its location is changed in a new kernel. Of course this is
287 still based on the assumption that the sigtramp is placed
288 directly under the location where the program arguments and
289 environment can be found. */
296 mib
[1] = KERN_PS_STRINGS
;
297 len
= sizeof (ps_strings
);
298 if (sysctl (mib
, 2, &ps_strings
, &len
, NULL
, 0) == 0)
300 amd64fbsd_sigtramp_start
= ps_strings
- 32;
301 amd64fbsd_sigtramp_end
= ps_strings
;