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 (current_regcache
, -1, fpregsetp
);
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
);
146 /* Provide a prototype to silence -Wmissing-prototypes. */
147 void _initialize_amd64fbsd_nat (void);
150 _initialize_amd64fbsd_nat (void)
154 amd64_native_gregset32_reg_offset
= amd64fbsd32_r_reg_offset
;
155 amd64_native_gregset64_reg_offset
= reg_offset
;
157 /* To support the recognition of signal handlers, i386bsd-tdep.c
158 hardcodes some constants. Inclusion of this file means that we
159 are compiling a native debugger, which means that we can use the
160 system header files and sysctl(3) to get at the relevant
163 #define SC_REG_OFFSET amd64fbsd_sc_reg_offset
165 /* We only check the program counter, stack pointer and frame
166 pointer since these members of `struct sigcontext' are essential
167 for providing backtraces. */
169 #define SC_RIP_OFFSET SC_REG_OFFSET[X86_64_RIP_REGNUM]
170 #define SC_RSP_OFFSET SC_REG_OFFSET[X86_64_RSP_REGNUM]
171 #define SC_RBP_OFFSET SC_REG_OFFSET[X86_64_RBP_REGNUM]
173 /* Override the default value for the offset of the program counter
174 in the sigcontext structure. */
175 offset
= offsetof (struct sigcontext
, sc_rip
);
177 if (SC_RIP_OFFSET
!= offset
)
180 offsetof (struct sigcontext, sc_rip) yields %d instead of %d.\n\
181 Please report this to <bug-gdb@gnu.org>.",
182 offset
, SC_RIP_OFFSET
);
185 SC_RIP_OFFSET
= offset
;
187 /* Likewise for the stack pointer. */
188 offset
= offsetof (struct sigcontext
, sc_rsp
);
190 if (SC_RSP_OFFSET
!= offset
)
193 offsetof (struct sigcontext, sc_rsp) yields %d instead of %d.\n\
194 Please report this to <bug-gdb@gnu.org>.",
195 offset
, SC_RSP_OFFSET
);
198 SC_RSP_OFFSET
= offset
;
200 /* And the frame pointer. */
201 offset
= offsetof (struct sigcontext
, sc_rbp
);
203 if (SC_RBP_OFFSET
!= offset
)
206 offsetof (struct sigcontext, sc_rbp) yields %d instead of %d.\n\
207 Please report this to <bug-gdb@gnu.org>.",
208 offset
, SC_RBP_OFFSET
);
211 SC_RBP_OFFSET
= offset
;
213 /* FreeBSD provides a kern.ps_strings sysctl that we can use to
214 locate the sigtramp. That way we can still recognize a sigtramp
215 if its location is changed in a new kernel. Of course this is
216 still based on the assumption that the sigtramp is placed
217 directly under the location where the program arguments and
218 environment can be found. */
225 mib
[1] = KERN_PS_STRINGS
;
226 len
= sizeof (ps_strings
);
227 if (sysctl (mib
, 2, &ps_strings
, &len
, NULL
, 0) == 0)
229 amd64fbsd_sigtramp_start
= ps_strings
- 32;
230 amd64fbsd_sigtramp_end
= ps_strings
;