1 /* Target-dependent code for FreeBSD/aarch64.
3 Copyright (C) 2017-2024 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/>. */
22 #include "fbsd-tdep.h"
23 #include "aarch64-tdep.h"
24 #include "aarch64-fbsd-tdep.h"
27 #include "solib-svr4.h"
29 #include "tramp-frame.h"
30 #include "trad-frame.h"
34 static const struct regcache_map_entry aarch64_fbsd_gregmap
[] =
36 { 30, AARCH64_X0_REGNUM
, 8 }, /* x0 ... x29 */
37 { 1, AARCH64_LR_REGNUM
, 8 },
38 { 1, AARCH64_SP_REGNUM
, 8 },
39 { 1, AARCH64_PC_REGNUM
, 8 },
40 { 1, AARCH64_CPSR_REGNUM
, 4 },
44 static const struct regcache_map_entry aarch64_fbsd_fpregmap
[] =
46 { 32, AARCH64_V0_REGNUM
, 16 }, /* v0 ... v31 */
47 { 1, AARCH64_FPSR_REGNUM
, 4 },
48 { 1, AARCH64_FPCR_REGNUM
, 4 },
52 /* Register numbers are relative to tdep->tls_regnum_base. */
54 static const struct regcache_map_entry aarch64_fbsd_tls_regmap
[] =
56 { 1, 0, 8 }, /* tpidr */
60 /* In a signal frame, sp points to a 'struct sigframe' which is
68 ucontext_t is defined as:
72 mcontext_t uc_mcontext;
76 The mcontext_t contains the general purpose register set followed
77 by the floating point register set. The floating point register
78 set is only valid if the _MC_FP_VALID flag is set in mc_flags. */
80 #define AARCH64_SIGFRAME_UCONTEXT_OFFSET 80
81 #define AARCH64_UCONTEXT_MCONTEXT_OFFSET 16
82 #define AARCH64_MCONTEXT_FPREGS_OFFSET 272
83 #define AARCH64_MCONTEXT_FLAGS_OFFSET 800
84 #define AARCH64_MCONTEXT_FLAG_FP_VALID 0x1
86 /* Implement the "init" method of struct tramp_frame. */
89 aarch64_fbsd_sigframe_init (const struct tramp_frame
*self
,
90 const frame_info_ptr
&this_frame
,
91 struct trad_frame_cache
*this_cache
,
94 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
95 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
96 CORE_ADDR sp
= get_frame_register_unsigned (this_frame
, AARCH64_SP_REGNUM
);
97 CORE_ADDR mcontext_addr
99 + AARCH64_SIGFRAME_UCONTEXT_OFFSET
100 + AARCH64_UCONTEXT_MCONTEXT_OFFSET
);
103 trad_frame_set_reg_regmap (this_cache
, aarch64_fbsd_gregmap
, mcontext_addr
,
104 regcache_map_entry_size (aarch64_fbsd_gregmap
));
106 if (target_read_memory (mcontext_addr
+ AARCH64_MCONTEXT_FLAGS_OFFSET
, buf
,
108 && (extract_unsigned_integer (buf
, 4, byte_order
)
109 & AARCH64_MCONTEXT_FLAG_FP_VALID
))
110 trad_frame_set_reg_regmap (this_cache
, aarch64_fbsd_fpregmap
,
111 mcontext_addr
+ AARCH64_MCONTEXT_FPREGS_OFFSET
,
112 regcache_map_entry_size (aarch64_fbsd_fpregmap
));
114 trad_frame_set_id (this_cache
, frame_id_build (sp
, func
));
117 static const struct tramp_frame aarch64_fbsd_sigframe
=
122 {0x910003e0, ULONGEST_MAX
}, /* mov x0, sp */
123 {0x91014000, ULONGEST_MAX
}, /* add x0, x0, #SF_UC */
124 {0xd2803428, ULONGEST_MAX
}, /* mov x8, #SYS_sigreturn */
125 {0xd4000001, ULONGEST_MAX
}, /* svc 0x0 */
126 {TRAMP_SENTINEL_INSN
, ULONGEST_MAX
}
128 aarch64_fbsd_sigframe_init
131 /* Register set definitions. */
133 const struct regset aarch64_fbsd_gregset
=
135 aarch64_fbsd_gregmap
,
136 regcache_supply_regset
, regcache_collect_regset
139 const struct regset aarch64_fbsd_fpregset
=
141 aarch64_fbsd_fpregmap
,
142 regcache_supply_regset
, regcache_collect_regset
146 aarch64_fbsd_supply_tls_regset (const struct regset
*regset
,
147 struct regcache
*regcache
,
148 int regnum
, const void *buf
, size_t size
)
150 struct gdbarch
*gdbarch
= regcache
->arch ();
151 aarch64_gdbarch_tdep
*tdep
= gdbarch_tdep
<aarch64_gdbarch_tdep
> (gdbarch
);
153 regcache
->supply_regset (regset
, tdep
->tls_regnum_base
, regnum
, buf
, size
);
157 aarch64_fbsd_collect_tls_regset (const struct regset
*regset
,
158 const struct regcache
*regcache
,
159 int regnum
, void *buf
, size_t size
)
161 struct gdbarch
*gdbarch
= regcache
->arch ();
162 aarch64_gdbarch_tdep
*tdep
= gdbarch_tdep
<aarch64_gdbarch_tdep
> (gdbarch
);
164 regcache
->collect_regset (regset
, tdep
->tls_regnum_base
, regnum
, buf
, size
);
167 const struct regset aarch64_fbsd_tls_regset
=
169 aarch64_fbsd_tls_regmap
,
170 aarch64_fbsd_supply_tls_regset
, aarch64_fbsd_collect_tls_regset
173 /* Implement the "iterate_over_regset_sections" gdbarch method. */
176 aarch64_fbsd_iterate_over_regset_sections (struct gdbarch
*gdbarch
,
177 iterate_over_regset_sections_cb
*cb
,
179 const struct regcache
*regcache
)
181 aarch64_gdbarch_tdep
*tdep
= gdbarch_tdep
<aarch64_gdbarch_tdep
> (gdbarch
);
183 cb (".reg", AARCH64_FBSD_SIZEOF_GREGSET
, AARCH64_FBSD_SIZEOF_GREGSET
,
184 &aarch64_fbsd_gregset
, NULL
, cb_data
);
185 cb (".reg2", AARCH64_FBSD_SIZEOF_FPREGSET
, AARCH64_FBSD_SIZEOF_FPREGSET
,
186 &aarch64_fbsd_fpregset
, NULL
, cb_data
);
188 if (tdep
->has_tls ())
189 cb (".reg-aarch-tls", AARCH64_FBSD_SIZEOF_TLSREGSET
,
190 AARCH64_FBSD_SIZEOF_TLSREGSET
, &aarch64_fbsd_tls_regset
,
191 "TLS register", cb_data
);
194 /* Implement the "core_read_description" gdbarch method. */
196 static const struct target_desc
*
197 aarch64_fbsd_core_read_description (struct gdbarch
*gdbarch
,
198 struct target_ops
*target
, bfd
*abfd
)
200 asection
*tls
= bfd_get_section_by_name (abfd
, ".reg-aarch-tls");
202 aarch64_features features
;
203 features
.tls
= tls
!= nullptr? 1 : 0;
205 return aarch64_read_description (features
);
208 /* Implement the get_thread_local_address gdbarch method. */
211 aarch64_fbsd_get_thread_local_address (struct gdbarch
*gdbarch
, ptid_t ptid
,
212 CORE_ADDR lm_addr
, CORE_ADDR offset
)
214 aarch64_gdbarch_tdep
*tdep
= gdbarch_tdep
<aarch64_gdbarch_tdep
> (gdbarch
);
215 struct regcache
*regcache
;
217 regcache
= get_thread_arch_regcache (current_inferior (), ptid
, gdbarch
);
219 target_fetch_registers (regcache
, tdep
->tls_regnum_base
);
222 if (regcache
->cooked_read (tdep
->tls_regnum_base
, &tpidr
) != REG_VALID
)
223 error (_("Unable to fetch %%tpidr"));
225 /* %tpidr points to the TCB whose first member is the dtv
227 CORE_ADDR dtv_addr
= tpidr
;
228 return fbsd_get_thread_local_address (gdbarch
, dtv_addr
, lm_addr
, offset
);
231 /* Implement the 'init_osabi' method of struct gdb_osabi_handler. */
234 aarch64_fbsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
236 aarch64_gdbarch_tdep
*tdep
= gdbarch_tdep
<aarch64_gdbarch_tdep
> (gdbarch
);
238 /* Generic FreeBSD support. */
239 fbsd_init_abi (info
, gdbarch
);
241 set_solib_svr4_fetch_link_map_offsets (gdbarch
,
242 svr4_lp64_fetch_link_map_offsets
);
244 tramp_frame_prepend_unwinder (gdbarch
, &aarch64_fbsd_sigframe
);
246 /* Enable longjmp. */
249 set_gdbarch_iterate_over_regset_sections
250 (gdbarch
, aarch64_fbsd_iterate_over_regset_sections
);
251 set_gdbarch_core_read_description (gdbarch
,
252 aarch64_fbsd_core_read_description
);
254 if (tdep
->has_tls ())
256 set_gdbarch_fetch_tls_load_module_address (gdbarch
,
257 svr4_fetch_objfile_link_map
);
258 set_gdbarch_get_thread_local_address
259 (gdbarch
, aarch64_fbsd_get_thread_local_address
);
263 void _initialize_aarch64_fbsd_tdep ();
265 _initialize_aarch64_fbsd_tdep ()
267 gdbarch_register_osabi (bfd_arch_aarch64
, 0, GDB_OSABI_FREEBSD
,
268 aarch64_fbsd_init_abi
);