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 /* Return whether THIS_FRAME corresponds to a FreeBSD sigtramp
37 static const gdb_byte amd64fbsd_sigtramp_code
[] =
39 0x48, 0x8d, 0x7c, 0x24, 0x10, /* lea SIGF_UC(%rsp),%rdi */
40 0x6a, 0x00, /* pushq $0 */
41 0x48, 0xc7, 0xc0, 0xa1, 0x01, 0x00, 0x00,
42 /* movq $SYS_sigreturn,%rax */
43 0x0f, 0x05 /* syscall */
47 amd64fbsd_sigtramp_p (struct frame_info
*this_frame
)
49 CORE_ADDR pc
= get_frame_pc (this_frame
);
50 gdb_byte buf
[sizeof amd64fbsd_sigtramp_code
];
52 if (!safe_frame_unwind_memory (this_frame
, pc
, buf
, sizeof buf
))
54 if (memcmp (buf
, amd64fbsd_sigtramp_code
, sizeof amd64fbsd_sigtramp_code
) !=
61 /* Assuming THIS_FRAME is for a BSD sigtramp routine, return the
62 address of the associated sigcontext structure. */
65 amd64fbsd_sigcontext_addr (struct frame_info
*this_frame
)
67 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
68 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
72 /* The `struct sigcontext' (which really is an `ucontext_t' on
73 FreeBSD/amd64) lives at a fixed offset in the signal frame. See
74 <machine/sigframe.h>. */
75 get_frame_register (this_frame
, AMD64_RSP_REGNUM
, buf
);
76 sp
= extract_unsigned_integer (buf
, 8, byte_order
);
80 /* FreeBSD 5.1-RELEASE or later. */
82 /* Mapping between the general-purpose registers in `struct reg'
83 format and GDB's register cache layout.
85 Note that some registers are 32-bit, but since we're little-endian
86 we get away with that. */
88 /* From <machine/reg.h>. */
89 static int amd64fbsd_r_reg_offset
[] =
106 0 * 8, /* ... %r15 */
108 19 * 8, /* %eflags */
117 /* Location of the signal trampoline. */
118 CORE_ADDR amd64fbsd_sigtramp_start_addr
;
119 CORE_ADDR amd64fbsd_sigtramp_end_addr
;
121 /* From <machine/signal.h>. */
122 int amd64fbsd_sc_reg_offset
[] =
124 24 + 6 * 8, /* %rax */
125 24 + 7 * 8, /* %rbx */
126 24 + 3 * 8, /* %rcx */
127 24 + 2 * 8, /* %rdx */
128 24 + 1 * 8, /* %rsi */
129 24 + 0 * 8, /* %rdi */
130 24 + 8 * 8, /* %rbp */
131 24 + 22 * 8, /* %rsp */
132 24 + 4 * 8, /* %r8 ... */
139 24 + 14 * 8, /* ... %r15 */
140 24 + 19 * 8, /* %rip */
141 24 + 21 * 8, /* %eflags */
142 24 + 20 * 8, /* %cs */
143 24 + 23 * 8, /* %ss */
150 /* From /usr/src/lib/libc/amd64/gen/_setjmp.S. */
151 static int amd64fbsd_jmp_buf_reg_offset
[] =
165 4 * 8, /* %r12 ... */
168 7 * 8, /* ... %r15 */
173 amd64fbsd_supply_uthread (struct regcache
*regcache
,
174 int regnum
, CORE_ADDR addr
)
179 gdb_assert (regnum
>= -1);
181 for (i
= 0; i
< ARRAY_SIZE (amd64fbsd_jmp_buf_reg_offset
); i
++)
183 if (amd64fbsd_jmp_buf_reg_offset
[i
] != -1
184 && (regnum
== -1 || regnum
== i
))
186 read_memory (addr
+ amd64fbsd_jmp_buf_reg_offset
[i
], buf
, 8);
187 regcache_raw_supply (regcache
, i
, buf
);
193 amd64fbsd_collect_uthread (const struct regcache
*regcache
,
194 int regnum
, CORE_ADDR addr
)
199 gdb_assert (regnum
>= -1);
201 for (i
= 0; i
< ARRAY_SIZE (amd64fbsd_jmp_buf_reg_offset
); i
++)
203 if (amd64fbsd_jmp_buf_reg_offset
[i
] != -1
204 && (regnum
== -1 || regnum
== i
))
206 regcache_raw_collect (regcache
, i
, buf
);
207 write_memory (addr
+ amd64fbsd_jmp_buf_reg_offset
[i
], buf
, 8);
213 amd64fbsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
215 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
217 /* Generic FreeBSD support. */
218 fbsd_init_abi (info
, gdbarch
);
220 /* Obviously FreeBSD is BSD-based. */
221 i386bsd_init_abi (info
, gdbarch
);
223 tdep
->gregset_reg_offset
= amd64fbsd_r_reg_offset
;
224 tdep
->gregset_num_regs
= ARRAY_SIZE (amd64fbsd_r_reg_offset
);
225 tdep
->sizeof_gregset
= 22 * 8;
227 amd64_init_abi (info
, gdbarch
);
229 tdep
->sigtramp_p
= amd64fbsd_sigtramp_p
;
230 tdep
->sigtramp_start
= amd64fbsd_sigtramp_start_addr
;
231 tdep
->sigtramp_end
= amd64fbsd_sigtramp_end_addr
;
232 tdep
->sigcontext_addr
= amd64fbsd_sigcontext_addr
;
233 tdep
->sc_reg_offset
= amd64fbsd_sc_reg_offset
;
234 tdep
->sc_num_regs
= ARRAY_SIZE (amd64fbsd_sc_reg_offset
);
236 /* FreeBSD provides a user-level threads implementation. */
237 bsd_uthread_set_supply_uthread (gdbarch
, amd64fbsd_supply_uthread
);
238 bsd_uthread_set_collect_uthread (gdbarch
, amd64fbsd_collect_uthread
);
240 /* FreeBSD uses SVR4-style shared libraries. */
241 set_solib_svr4_fetch_link_map_offsets
242 (gdbarch
, svr4_lp64_fetch_link_map_offsets
);
246 /* Provide a prototype to silence -Wmissing-prototypes. */
247 void _initialize_amd64fbsd_tdep (void);
250 _initialize_amd64fbsd_tdep (void)
252 gdbarch_register_osabi (bfd_arch_i386
, bfd_mach_x86_64
,
253 GDB_OSABI_FREEBSD_ELF
, amd64fbsd_init_abi
);