1 /* Target-dependent code for FreeBSD/amd64.
3 Copyright (C) 2003-2014 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/>. */
21 #include "arch-utils.h"
27 #include "amd64-tdep.h"
28 #include "bsd-uthread.h"
29 #include "fbsd-tdep.h"
30 #include "solib-svr4.h"
32 /* Support for signal handlers. */
34 /* Assuming THIS_FRAME is for a BSD sigtramp routine, return the
35 address of the associated sigcontext structure. */
38 amd64fbsd_sigcontext_addr (struct frame_info
*this_frame
)
42 /* The `struct sigcontext' (which really is an `ucontext_t' on
43 FreeBSD/amd64) lives at a fixed offset in the signal frame. See
44 <machine/sigframe.h>. */
45 sp
= frame_unwind_register_unsigned (this_frame
, AMD64_RSP_REGNUM
);
49 /* FreeBSD 5.1-RELEASE or later. */
51 /* Mapping between the general-purpose registers in `struct reg'
52 format and GDB's register cache layout.
54 Note that some registers are 32-bit, but since we're little-endian
55 we get away with that. */
57 /* From <machine/reg.h>. */
58 static int amd64fbsd_r_reg_offset
[] =
86 /* Location of the signal trampoline. */
87 CORE_ADDR amd64fbsd_sigtramp_start_addr
= 0x7fffffffffc0ULL
;
88 CORE_ADDR amd64fbsd_sigtramp_end_addr
= 0x7fffffffffe0ULL
;
90 /* From <machine/signal.h>. */
91 int amd64fbsd_sc_reg_offset
[] =
93 24 + 6 * 8, /* %rax */
94 24 + 7 * 8, /* %rbx */
95 24 + 3 * 8, /* %rcx */
96 24 + 2 * 8, /* %rdx */
97 24 + 1 * 8, /* %rsi */
98 24 + 0 * 8, /* %rdi */
99 24 + 8 * 8, /* %rbp */
100 24 + 22 * 8, /* %rsp */
101 24 + 4 * 8, /* %r8 ... */
108 24 + 14 * 8, /* ... %r15 */
109 24 + 19 * 8, /* %rip */
110 24 + 21 * 8, /* %eflags */
111 24 + 20 * 8, /* %cs */
112 24 + 23 * 8, /* %ss */
119 /* From /usr/src/lib/libc/amd64/gen/_setjmp.S. */
120 static int amd64fbsd_jmp_buf_reg_offset
[] =
134 4 * 8, /* %r12 ... */
137 7 * 8, /* ... %r15 */
142 amd64fbsd_supply_uthread (struct regcache
*regcache
,
143 int regnum
, CORE_ADDR addr
)
148 gdb_assert (regnum
>= -1);
150 for (i
= 0; i
< ARRAY_SIZE (amd64fbsd_jmp_buf_reg_offset
); i
++)
152 if (amd64fbsd_jmp_buf_reg_offset
[i
] != -1
153 && (regnum
== -1 || regnum
== i
))
155 read_memory (addr
+ amd64fbsd_jmp_buf_reg_offset
[i
], buf
, 8);
156 regcache_raw_supply (regcache
, i
, buf
);
162 amd64fbsd_collect_uthread (const struct regcache
*regcache
,
163 int regnum
, CORE_ADDR addr
)
168 gdb_assert (regnum
>= -1);
170 for (i
= 0; i
< ARRAY_SIZE (amd64fbsd_jmp_buf_reg_offset
); i
++)
172 if (amd64fbsd_jmp_buf_reg_offset
[i
] != -1
173 && (regnum
== -1 || regnum
== i
))
175 regcache_raw_collect (regcache
, i
, buf
);
176 write_memory (addr
+ amd64fbsd_jmp_buf_reg_offset
[i
], buf
, 8);
182 amd64fbsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
184 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
186 /* Generic FreeBSD support. */
187 fbsd_init_abi (info
, gdbarch
);
189 /* Obviously FreeBSD is BSD-based. */
190 i386bsd_init_abi (info
, gdbarch
);
192 tdep
->gregset_reg_offset
= amd64fbsd_r_reg_offset
;
193 tdep
->gregset_num_regs
= ARRAY_SIZE (amd64fbsd_r_reg_offset
);
194 tdep
->sizeof_gregset
= 22 * 8;
196 amd64_init_abi (info
, gdbarch
);
198 tdep
->sigtramp_start
= amd64fbsd_sigtramp_start_addr
;
199 tdep
->sigtramp_end
= amd64fbsd_sigtramp_end_addr
;
200 tdep
->sigcontext_addr
= amd64fbsd_sigcontext_addr
;
201 tdep
->sc_reg_offset
= amd64fbsd_sc_reg_offset
;
202 tdep
->sc_num_regs
= ARRAY_SIZE (amd64fbsd_sc_reg_offset
);
204 /* FreeBSD provides a user-level threads implementation. */
205 bsd_uthread_set_supply_uthread (gdbarch
, amd64fbsd_supply_uthread
);
206 bsd_uthread_set_collect_uthread (gdbarch
, amd64fbsd_collect_uthread
);
208 /* FreeBSD uses SVR4-style shared libraries. */
209 set_solib_svr4_fetch_link_map_offsets
210 (gdbarch
, svr4_lp64_fetch_link_map_offsets
);
214 /* Provide a prototype to silence -Wmissing-prototypes. */
215 void _initialize_amd64fbsd_tdep (void);
218 _initialize_amd64fbsd_tdep (void)
220 gdbarch_register_osabi (bfd_arch_i386
, bfd_mach_x86_64
,
221 GDB_OSABI_FREEBSD_ELF
, amd64fbsd_init_abi
);