1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
/* Target-dependent code for FreeBSD/aarch64.
Copyright (C) 2017-2022 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "gdbarch.h"
#include "fbsd-tdep.h"
#include "aarch64-tdep.h"
#include "aarch64-fbsd-tdep.h"
#include "osabi.h"
#include "solib-svr4.h"
#include "target.h"
#include "tramp-frame.h"
#include "trad-frame.h"
/* Register maps. */
static const struct regcache_map_entry aarch64_fbsd_gregmap[] =
{
{ 30, AARCH64_X0_REGNUM, 8 }, /* x0 ... x29 */
{ 1, AARCH64_LR_REGNUM, 8 },
{ 1, AARCH64_SP_REGNUM, 8 },
{ 1, AARCH64_PC_REGNUM, 8 },
{ 1, AARCH64_CPSR_REGNUM, 4 },
{ 0 }
};
static const struct regcache_map_entry aarch64_fbsd_fpregmap[] =
{
{ 32, AARCH64_V0_REGNUM, 16 }, /* v0 ... v31 */
{ 1, AARCH64_FPSR_REGNUM, 4 },
{ 1, AARCH64_FPCR_REGNUM, 4 },
{ 0 }
};
/* In a signal frame, sp points to a 'struct sigframe' which is
defined as:
struct sigframe {
siginfo_t sf_si;
ucontext_t sf_uc;
};
ucontext_t is defined as:
struct __ucontext {
sigset_t uc_sigmask;
mcontext_t uc_mcontext;
...
};
The mcontext_t contains the general purpose register set followed
by the floating point register set. The floating point register
set is only valid if the _MC_FP_VALID flag is set in mc_flags. */
#define AARCH64_SIGFRAME_UCONTEXT_OFFSET 80
#define AARCH64_UCONTEXT_MCONTEXT_OFFSET 16
#define AARCH64_MCONTEXT_FPREGS_OFFSET 272
#define AARCH64_MCONTEXT_FLAGS_OFFSET 800
#define AARCH64_MCONTEXT_FLAG_FP_VALID 0x1
/* Implement the "init" method of struct tramp_frame. */
static void
aarch64_fbsd_sigframe_init (const struct tramp_frame *self,
struct frame_info *this_frame,
struct trad_frame_cache *this_cache,
CORE_ADDR func)
{
struct gdbarch *gdbarch = get_frame_arch (this_frame);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR sp = get_frame_register_unsigned (this_frame, AARCH64_SP_REGNUM);
CORE_ADDR mcontext_addr
= (sp
+ AARCH64_SIGFRAME_UCONTEXT_OFFSET
+ AARCH64_UCONTEXT_MCONTEXT_OFFSET);
gdb_byte buf[4];
trad_frame_set_reg_regmap (this_cache, aarch64_fbsd_gregmap, mcontext_addr,
regcache_map_entry_size (aarch64_fbsd_gregmap));
if (target_read_memory (mcontext_addr + AARCH64_MCONTEXT_FLAGS_OFFSET, buf,
4) == 0
&& (extract_unsigned_integer (buf, 4, byte_order)
& AARCH64_MCONTEXT_FLAG_FP_VALID))
trad_frame_set_reg_regmap (this_cache, aarch64_fbsd_fpregmap,
mcontext_addr + AARCH64_MCONTEXT_FPREGS_OFFSET,
regcache_map_entry_size (aarch64_fbsd_fpregmap));
trad_frame_set_id (this_cache, frame_id_build (sp, func));
}
static const struct tramp_frame aarch64_fbsd_sigframe =
{
SIGTRAMP_FRAME,
4,
{
{0x910003e0, ULONGEST_MAX}, /* mov x0, sp */
{0x91014000, ULONGEST_MAX}, /* add x0, x0, #SF_UC */
{0xd2803428, ULONGEST_MAX}, /* mov x8, #SYS_sigreturn */
{0xd4000001, ULONGEST_MAX}, /* svc 0x0 */
{TRAMP_SENTINEL_INSN, ULONGEST_MAX}
},
aarch64_fbsd_sigframe_init
};
/* Register set definitions. */
const struct regset aarch64_fbsd_gregset =
{
aarch64_fbsd_gregmap,
regcache_supply_regset, regcache_collect_regset
};
const struct regset aarch64_fbsd_fpregset =
{
aarch64_fbsd_fpregmap,
regcache_supply_regset, regcache_collect_regset
};
/* Implement the "iterate_over_regset_sections" gdbarch method. */
static void
aarch64_fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
iterate_over_regset_sections_cb *cb,
void *cb_data,
const struct regcache *regcache)
{
cb (".reg", AARCH64_FBSD_SIZEOF_GREGSET, AARCH64_FBSD_SIZEOF_GREGSET,
&aarch64_fbsd_gregset, NULL, cb_data);
cb (".reg2", AARCH64_FBSD_SIZEOF_FPREGSET, AARCH64_FBSD_SIZEOF_FPREGSET,
&aarch64_fbsd_fpregset, NULL, cb_data);
}
/* Implement the 'init_osabi' method of struct gdb_osabi_handler. */
static void
aarch64_fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
aarch64_gdbarch_tdep *tdep = (aarch64_gdbarch_tdep *) gdbarch_tdep (gdbarch);
/* Generic FreeBSD support. */
fbsd_init_abi (info, gdbarch);
set_solib_svr4_fetch_link_map_offsets (gdbarch,
svr4_lp64_fetch_link_map_offsets);
tramp_frame_prepend_unwinder (gdbarch, &aarch64_fbsd_sigframe);
/* Enable longjmp. */
tdep->jb_pc = 13;
set_gdbarch_iterate_over_regset_sections
(gdbarch, aarch64_fbsd_iterate_over_regset_sections);
}
void _initialize_aarch64_fbsd_tdep ();
void
_initialize_aarch64_fbsd_tdep ()
{
gdbarch_register_osabi (bfd_arch_aarch64, 0, GDB_OSABI_FREEBSD,
aarch64_fbsd_init_abi);
}
|
