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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
|
/* Target-dependent code for FreeBSD/aarch64.
Copyright (C) 2017-2024 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 "extract-store-integer.h"
#include "gdbarch.h"
#include "fbsd-tdep.h"
#include "aarch64-tdep.h"
#include "aarch64-fbsd-tdep.h"
#include "inferior.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 }
};
/* Register numbers are relative to tdep->tls_regnum_base. */
static const struct regcache_map_entry aarch64_fbsd_tls_regmap[] =
{
{ 1, 0, 8 }, /* tpidr */
{ 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,
const frame_info_ptr &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
};
static void
aarch64_fbsd_supply_tls_regset (const struct regset *regset,
struct regcache *regcache,
int regnum, const void *buf, size_t size)
{
struct gdbarch *gdbarch = regcache->arch ();
aarch64_gdbarch_tdep *tdep = gdbarch_tdep<aarch64_gdbarch_tdep> (gdbarch);
regcache->supply_regset (regset, tdep->tls_regnum_base, regnum, buf, size);
}
static void
aarch64_fbsd_collect_tls_regset (const struct regset *regset,
const struct regcache *regcache,
int regnum, void *buf, size_t size)
{
struct gdbarch *gdbarch = regcache->arch ();
aarch64_gdbarch_tdep *tdep = gdbarch_tdep<aarch64_gdbarch_tdep> (gdbarch);
regcache->collect_regset (regset, tdep->tls_regnum_base, regnum, buf, size);
}
const struct regset aarch64_fbsd_tls_regset =
{
aarch64_fbsd_tls_regmap,
aarch64_fbsd_supply_tls_regset, aarch64_fbsd_collect_tls_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)
{
aarch64_gdbarch_tdep *tdep = gdbarch_tdep<aarch64_gdbarch_tdep> (gdbarch);
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);
if (tdep->has_tls ())
cb (".reg-aarch-tls", AARCH64_FBSD_SIZEOF_TLSREGSET,
AARCH64_FBSD_SIZEOF_TLSREGSET, &aarch64_fbsd_tls_regset,
"TLS register", cb_data);
}
/* Implement the "core_read_description" gdbarch method. */
static const struct target_desc *
aarch64_fbsd_core_read_description (struct gdbarch *gdbarch,
struct target_ops *target, bfd *abfd)
{
asection *tls = bfd_get_section_by_name (abfd, ".reg-aarch-tls");
aarch64_features features;
features.tls = tls != nullptr? 1 : 0;
return aarch64_read_description (features);
}
/* Implement the get_thread_local_address gdbarch method. */
static CORE_ADDR
aarch64_fbsd_get_thread_local_address (struct gdbarch *gdbarch, ptid_t ptid,
CORE_ADDR lm_addr, CORE_ADDR offset)
{
aarch64_gdbarch_tdep *tdep = gdbarch_tdep<aarch64_gdbarch_tdep> (gdbarch);
struct regcache *regcache;
regcache = get_thread_arch_regcache (current_inferior (), ptid, gdbarch);
target_fetch_registers (regcache, tdep->tls_regnum_base);
ULONGEST tpidr;
if (regcache->cooked_read (tdep->tls_regnum_base, &tpidr) != REG_VALID)
error (_("Unable to fetch %%tpidr"));
/* %tpidr points to the TCB whose first member is the dtv
pointer. */
CORE_ADDR dtv_addr = tpidr;
return fbsd_get_thread_local_address (gdbarch, dtv_addr, lm_addr, offset);
}
/* 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 = gdbarch_tdep<aarch64_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);
set_gdbarch_core_read_description (gdbarch,
aarch64_fbsd_core_read_description);
if (tdep->has_tls ())
{
set_gdbarch_fetch_tls_load_module_address (gdbarch,
svr4_fetch_objfile_link_map);
set_gdbarch_get_thread_local_address
(gdbarch, aarch64_fbsd_get_thread_local_address);
}
}
void _initialize_aarch64_fbsd_tdep ();
void
_initialize_aarch64_fbsd_tdep ()
{
gdbarch_register_osabi (bfd_arch_aarch64, 0, GDB_OSABI_FREEBSD,
aarch64_fbsd_init_abi);
}
|
