1 /* Target-dependent code for FreeBSD/amd64.
3 Copyright (C) 2003-2015 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
)
40 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
41 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
45 /* The `struct sigcontext' (which really is an `ucontext_t' on
46 FreeBSD/amd64) lives at a fixed offset in the signal frame. See
47 <machine/sigframe.h>. */
48 get_frame_register (this_frame
, AMD64_RSP_REGNUM
, buf
);
49 sp
= extract_unsigned_integer (buf
, 8, byte_order
);
53 /* FreeBSD 5.1-RELEASE or later. */
55 /* Mapping between the general-purpose registers in `struct reg'
56 format and GDB's register cache layout.
58 Note that some registers are 32-bit, but since we're little-endian
59 we get away with that. */
61 /* From <machine/reg.h>. */
62 static int amd64fbsd_r_reg_offset
[] =
90 /* Location of the signal trampoline. */
91 CORE_ADDR amd64fbsd_sigtramp_start_addr
= 0x7fffffffffc0ULL
;
92 CORE_ADDR amd64fbsd_sigtramp_end_addr
= 0x7fffffffffe0ULL
;
94 /* From <machine/signal.h>. */
95 int amd64fbsd_sc_reg_offset
[] =
97 24 + 6 * 8, /* %rax */
98 24 + 7 * 8, /* %rbx */
99 24 + 3 * 8, /* %rcx */
100 24 + 2 * 8, /* %rdx */
101 24 + 1 * 8, /* %rsi */
102 24 + 0 * 8, /* %rdi */
103 24 + 8 * 8, /* %rbp */
104 24 + 22 * 8, /* %rsp */
105 24 + 4 * 8, /* %r8 ... */
112 24 + 14 * 8, /* ... %r15 */
113 24 + 19 * 8, /* %rip */
114 24 + 21 * 8, /* %eflags */
115 24 + 20 * 8, /* %cs */
116 24 + 23 * 8, /* %ss */
123 /* From /usr/src/lib/libc/amd64/gen/_setjmp.S. */
124 static int amd64fbsd_jmp_buf_reg_offset
[] =
138 4 * 8, /* %r12 ... */
141 7 * 8, /* ... %r15 */
146 amd64fbsd_supply_uthread (struct regcache
*regcache
,
147 int regnum
, CORE_ADDR addr
)
152 gdb_assert (regnum
>= -1);
154 for (i
= 0; i
< ARRAY_SIZE (amd64fbsd_jmp_buf_reg_offset
); i
++)
156 if (amd64fbsd_jmp_buf_reg_offset
[i
] != -1
157 && (regnum
== -1 || regnum
== i
))
159 read_memory (addr
+ amd64fbsd_jmp_buf_reg_offset
[i
], buf
, 8);
160 regcache_raw_supply (regcache
, i
, buf
);
166 amd64fbsd_collect_uthread (const struct regcache
*regcache
,
167 int regnum
, CORE_ADDR addr
)
172 gdb_assert (regnum
>= -1);
174 for (i
= 0; i
< ARRAY_SIZE (amd64fbsd_jmp_buf_reg_offset
); i
++)
176 if (amd64fbsd_jmp_buf_reg_offset
[i
] != -1
177 && (regnum
== -1 || regnum
== i
))
179 regcache_raw_collect (regcache
, i
, buf
);
180 write_memory (addr
+ amd64fbsd_jmp_buf_reg_offset
[i
], buf
, 8);
186 amd64fbsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
188 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
190 /* Generic FreeBSD support. */
191 fbsd_init_abi (info
, gdbarch
);
193 /* Obviously FreeBSD is BSD-based. */
194 i386bsd_init_abi (info
, gdbarch
);
196 tdep
->gregset_reg_offset
= amd64fbsd_r_reg_offset
;
197 tdep
->gregset_num_regs
= ARRAY_SIZE (amd64fbsd_r_reg_offset
);
198 tdep
->sizeof_gregset
= 22 * 8;
200 amd64_init_abi (info
, gdbarch
);
202 tdep
->sigtramp_start
= amd64fbsd_sigtramp_start_addr
;
203 tdep
->sigtramp_end
= amd64fbsd_sigtramp_end_addr
;
204 tdep
->sigcontext_addr
= amd64fbsd_sigcontext_addr
;
205 tdep
->sc_reg_offset
= amd64fbsd_sc_reg_offset
;
206 tdep
->sc_num_regs
= ARRAY_SIZE (amd64fbsd_sc_reg_offset
);
208 /* FreeBSD provides a user-level threads implementation. */
209 bsd_uthread_set_supply_uthread (gdbarch
, amd64fbsd_supply_uthread
);
210 bsd_uthread_set_collect_uthread (gdbarch
, amd64fbsd_collect_uthread
);
212 /* FreeBSD uses SVR4-style shared libraries. */
213 set_solib_svr4_fetch_link_map_offsets
214 (gdbarch
, svr4_lp64_fetch_link_map_offsets
);
218 /* Provide a prototype to silence -Wmissing-prototypes. */
219 void _initialize_amd64fbsd_tdep (void);
222 _initialize_amd64fbsd_tdep (void)
224 gdbarch_register_osabi (bfd_arch_i386
, bfd_mach_x86_64
,
225 GDB_OSABI_FREEBSD_ELF
, amd64fbsd_init_abi
);