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aarch64-fbsd-tdep.c
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1/* Target-dependent code for FreeBSD/aarch64.
2
3 Copyright (C) 2017-2023 Free Software Foundation, Inc.
4
5 This file is part of GDB.
6
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.
11
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.
16
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/>. */
19
20#include "defs.h"
21
22#include "gdbarch.h"
23#include "fbsd-tdep.h"
24#include "aarch64-tdep.h"
25#include "aarch64-fbsd-tdep.h"
26#include "inferior.h"
27#include "osabi.h"
28#include "solib-svr4.h"
29#include "target.h"
30#include "tramp-frame.h"
31#include "trad-frame.h"
32
33/* Register maps. */
34
36 {
37 { 30, AARCH64_X0_REGNUM, 8 }, /* x0 ... x29 */
38 { 1, AARCH64_LR_REGNUM, 8 },
39 { 1, AARCH64_SP_REGNUM, 8 },
40 { 1, AARCH64_PC_REGNUM, 8 },
41 { 1, AARCH64_CPSR_REGNUM, 4 },
42 { 0 }
43 };
44
46 {
47 { 32, AARCH64_V0_REGNUM, 16 }, /* v0 ... v31 */
48 { 1, AARCH64_FPSR_REGNUM, 4 },
49 { 1, AARCH64_FPCR_REGNUM, 4 },
50 { 0 }
51 };
52
53/* Register numbers are relative to tdep->tls_regnum_base. */
54
56 {
57 { 1, 0, 8 }, /* tpidr */
58 { 0 }
59 };
60
61/* In a signal frame, sp points to a 'struct sigframe' which is
62 defined as:
63
64 struct sigframe {
65 siginfo_t sf_si;
66 ucontext_t sf_uc;
67 };
68
69 ucontext_t is defined as:
70
71 struct __ucontext {
72 sigset_t uc_sigmask;
73 mcontext_t uc_mcontext;
74 ...
75 };
76
77 The mcontext_t contains the general purpose register set followed
78 by the floating point register set. The floating point register
79 set is only valid if the _MC_FP_VALID flag is set in mc_flags. */
80
81#define AARCH64_SIGFRAME_UCONTEXT_OFFSET 80
82#define AARCH64_UCONTEXT_MCONTEXT_OFFSET 16
83#define AARCH64_MCONTEXT_FPREGS_OFFSET 272
84#define AARCH64_MCONTEXT_FLAGS_OFFSET 800
85#define AARCH64_MCONTEXT_FLAG_FP_VALID 0x1
86
87/* Implement the "init" method of struct tramp_frame. */
88
89static void
91 frame_info_ptr this_frame,
92 struct trad_frame_cache *this_cache,
93 CORE_ADDR func)
94{
95 struct gdbarch *gdbarch = get_frame_arch (this_frame);
96 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
97 CORE_ADDR sp = get_frame_register_unsigned (this_frame, AARCH64_SP_REGNUM);
98 CORE_ADDR mcontext_addr
99 = (sp
102 gdb_byte buf[4];
103
104 trad_frame_set_reg_regmap (this_cache, aarch64_fbsd_gregmap, mcontext_addr,
106
107 if (target_read_memory (mcontext_addr + AARCH64_MCONTEXT_FLAGS_OFFSET, buf,
108 4) == 0
109 && (extract_unsigned_integer (buf, 4, byte_order)
112 mcontext_addr + AARCH64_MCONTEXT_FPREGS_OFFSET,
114
115 trad_frame_set_id (this_cache, frame_id_build (sp, func));
116}
117
119{
121 4,
122 {
123 {0x910003e0, ULONGEST_MAX}, /* mov x0, sp */
124 {0x91014000, ULONGEST_MAX}, /* add x0, x0, #SF_UC */
125 {0xd2803428, ULONGEST_MAX}, /* mov x8, #SYS_sigreturn */
126 {0xd4000001, ULONGEST_MAX}, /* svc 0x0 */
127 {TRAMP_SENTINEL_INSN, ULONGEST_MAX}
128 },
130};
131
132/* Register set definitions. */
133
139
145
146static void
148 struct regcache *regcache,
149 int regnum, const void *buf, size_t size)
150{
151 struct gdbarch *gdbarch = regcache->arch ();
152 aarch64_gdbarch_tdep *tdep = gdbarch_tdep<aarch64_gdbarch_tdep> (gdbarch);
153
155}
156
157static void
159 const struct regcache *regcache,
160 int regnum, void *buf, size_t size)
161{
162 struct gdbarch *gdbarch = regcache->arch ();
163 aarch64_gdbarch_tdep *tdep = gdbarch_tdep<aarch64_gdbarch_tdep> (gdbarch);
164
166}
167
173
174/* Implement the "iterate_over_regset_sections" gdbarch method. */
175
176static void
179 void *cb_data,
180 const struct regcache *regcache)
181{
182 aarch64_gdbarch_tdep *tdep = gdbarch_tdep<aarch64_gdbarch_tdep> (gdbarch);
183
185 &aarch64_fbsd_gregset, NULL, cb_data);
187 &aarch64_fbsd_fpregset, NULL, cb_data);
188
189 if (tdep->has_tls ())
190 cb (".reg-aarch-tls", AARCH64_FBSD_SIZEOF_TLSREGSET,
192 "TLS register", cb_data);
193}
194
195/* Implement the "core_read_description" gdbarch method. */
196
197static const struct target_desc *
199 struct target_ops *target, bfd *abfd)
200{
201 asection *tls = bfd_get_section_by_name (abfd, ".reg-aarch-tls");
202
204 features.tls = tls != nullptr? 1 : 0;
205
207}
208
209/* Implement the get_thread_local_address gdbarch method. */
210
211static CORE_ADDR
213 CORE_ADDR lm_addr, CORE_ADDR offset)
214{
215 aarch64_gdbarch_tdep *tdep = gdbarch_tdep<aarch64_gdbarch_tdep> (gdbarch);
216 struct regcache *regcache;
217
218 regcache = get_thread_arch_regcache (current_inferior ()->process_target (),
219 ptid, gdbarch);
220
222
223 ULONGEST tpidr;
224 if (regcache->cooked_read (tdep->tls_regnum_base, &tpidr) != REG_VALID)
225 error (_("Unable to fetch %%tpidr"));
226
227 /* %tpidr points to the TCB whose first member is the dtv
228 pointer. */
229 CORE_ADDR dtv_addr = tpidr;
230 return fbsd_get_thread_local_address (gdbarch, dtv_addr, lm_addr, offset);
231}
232
233/* Implement the 'init_osabi' method of struct gdb_osabi_handler. */
234
235static void
264
266void
const struct regset aarch64_fbsd_fpregset
static void aarch64_fbsd_sigframe_init(const struct tramp_frame *self, frame_info_ptr this_frame, struct trad_frame_cache *this_cache, CORE_ADDR func)
static const struct regcache_map_entry aarch64_fbsd_gregmap[]
#define AARCH64_MCONTEXT_FLAG_FP_VALID
static void aarch64_fbsd_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
#define AARCH64_UCONTEXT_MCONTEXT_OFFSET
#define AARCH64_MCONTEXT_FPREGS_OFFSET
#define AARCH64_SIGFRAME_UCONTEXT_OFFSET
void _initialize_aarch64_fbsd_tdep()
const struct regset aarch64_fbsd_gregset
static const struct regcache_map_entry aarch64_fbsd_tls_regmap[]
static const struct tramp_frame aarch64_fbsd_sigframe
#define AARCH64_MCONTEXT_FLAGS_OFFSET
const struct regset aarch64_fbsd_tls_regset
static void aarch64_fbsd_iterate_over_regset_sections(struct gdbarch *gdbarch, iterate_over_regset_sections_cb *cb, void *cb_data, const struct regcache *regcache)
static void aarch64_fbsd_collect_tls_regset(const struct regset *regset, const struct regcache *regcache, int regnum, void *buf, size_t size)
static void aarch64_fbsd_supply_tls_regset(const struct regset *regset, struct regcache *regcache, int regnum, const void *buf, size_t size)
static CORE_ADDR aarch64_fbsd_get_thread_local_address(struct gdbarch *gdbarch, ptid_t ptid, CORE_ADDR lm_addr, CORE_ADDR offset)
static const struct target_desc * aarch64_fbsd_core_read_description(struct gdbarch *gdbarch, struct target_ops *target, bfd *abfd)
static const struct regcache_map_entry aarch64_fbsd_fpregmap[]
#define AARCH64_FBSD_SIZEOF_GREGSET
#define AARCH64_FBSD_SIZEOF_FPREGSET
#define AARCH64_FBSD_SIZEOF_TLSREGSET
int regnum
const target_desc * aarch64_read_description(const aarch64_features &features)
@ AARCH64_PC_REGNUM
Definition aarch64.h:119
@ AARCH64_CPSR_REGNUM
Definition aarch64.h:120
@ AARCH64_SP_REGNUM
Definition aarch64.h:118
@ AARCH64_FPSR_REGNUM
Definition aarch64.h:125
@ AARCH64_FPCR_REGNUM
Definition aarch64.h:126
@ AARCH64_LR_REGNUM
Definition aarch64.h:117
@ AARCH64_X0_REGNUM
Definition aarch64.h:115
@ AARCH64_V0_REGNUM
Definition aarch64.h:121
enum register_status cooked_read(int regnum, gdb_byte *buf)
Definition regcache.c:698
friend class regcache
Definition regcache.h:269
gdbarch * arch() const
Definition regcache.c:231
void collect_regset(const struct regset *regset, int regbase, int regnum, void *buf, size_t size) const
Definition regcache.c:1283
ptid_t ptid() const
Definition regcache.h:408
void supply_regset(const struct regset *regset, int regbase, int regnum, const void *buf, size_t size)
Definition regcache.c:1261
static ULONGEST extract_unsigned_integer(gdb::array_view< const gdb_byte > buf, enum bfd_endian byte_order)
Definition defs.h:480
CORE_ADDR fbsd_get_thread_local_address(struct gdbarch *gdbarch, CORE_ADDR dtv_addr, CORE_ADDR lm_addr, CORE_ADDR offset)
Definition fbsd-tdep.c:2027
void fbsd_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
Definition fbsd-tdep.c:2380
ULONGEST get_frame_register_unsigned(frame_info_ptr frame, int regnum)
Definition frame.c:1399
struct frame_id frame_id_build(CORE_ADDR stack_addr, CORE_ADDR code_addr)
Definition frame.c:736
struct gdbarch * get_frame_arch(frame_info_ptr this_frame)
Definition frame.c:3027
@ SIGTRAMP_FRAME
Definition frame.h:198
enum bfd_endian gdbarch_byte_order(struct gdbarch *gdbarch)
Definition gdbarch.c:1396
void set_gdbarch_get_thread_local_address(struct gdbarch *gdbarch, gdbarch_get_thread_local_address_ftype *get_thread_local_address)
void set_gdbarch_core_read_description(struct gdbarch *gdbarch, gdbarch_core_read_description_ftype *core_read_description)
void set_gdbarch_fetch_tls_load_module_address(struct gdbarch *gdbarch, gdbarch_fetch_tls_load_module_address_ftype *fetch_tls_load_module_address)
void set_gdbarch_iterate_over_regset_sections(struct gdbarch *gdbarch, gdbarch_iterate_over_regset_sections_ftype *iterate_over_regset_sections)
void iterate_over_regset_sections_cb(const char *sect_name, int supply_size, int collect_size, const struct regset *regset, const char *human_name, void *cb_data)
Definition gdbarch.h:104
size_t size
Definition go32-nat.c:239
struct inferior * current_inferior(void)
Definition inferior.c:55
static CORE_ADDR lm_addr(struct so_list *so)
Definition nto-tdep.c:246
void gdbarch_register_osabi(enum bfd_architecture arch, unsigned long machine, enum gdb_osabi osabi, void(*init_osabi)(struct gdbarch_info, struct gdbarch *))
Definition osabi.c:146
@ GDB_OSABI_FREEBSD
Definition osabi.h:33
void regcache_collect_regset(const struct regset *regset, const struct regcache *regcache, int regnum, void *buf, size_t size)
Definition regcache.c:1273
struct regcache * get_thread_arch_regcache(process_stratum_target *target, ptid_t ptid, struct gdbarch *gdbarch)
Definition regcache.c:384
void regcache_supply_regset(const struct regset *regset, struct regcache *regcache, int regnum, const void *buf, size_t size)
Definition regcache.c:1251
static int regcache_map_entry_size(const struct regcache_map_entry *map)
Definition regcache.h:128
void(* func)(remote_target *remote, char *)
void set_solib_svr4_fetch_link_map_offsets(struct gdbarch *gdbarch, struct link_map_offsets *(*flmo)(void))
struct link_map_offsets * svr4_lp64_fetch_link_map_offsets(void)
CORE_ADDR svr4_fetch_objfile_link_map(struct objfile *objfile)
uint8_t tls
Definition aarch64.h:39
Definition regcache.h:111
std::vector< tdesc_feature_up > features
void target_fetch_registers(struct regcache *regcache, int regno)
Definition target.c:3928
int target_read_memory(CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len)
Definition target.c:1785
void trad_frame_set_reg_regmap(struct trad_frame_cache *this_trad_cache, const struct regcache_map_entry *regmap, CORE_ADDR addr, size_t size)
Definition trad-frame.c:117
void trad_frame_set_id(struct trad_frame_cache *this_trad_cache, struct frame_id this_id)
Definition trad-frame.c:220
void tramp_frame_prepend_unwinder(struct gdbarch *gdbarch, const struct tramp_frame *tramp_frame)
#define TRAMP_SENTINEL_INSN
Definition tramp-frame.h:44