1 /* Target-dependent code for FreeBSD/arm.
3 Copyright (C) 2017-2022 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 "elf/common.h"
23 #include "target-descriptions.h"
24 #include "aarch32-tdep.h"
26 #include "arm-fbsd-tdep.h"
28 #include "fbsd-tdep.h"
32 #include "solib-svr4.h"
33 #include "trad-frame.h"
34 #include "tramp-frame.h"
38 static const struct regcache_map_entry arm_fbsd_gregmap
[] =
40 { 13, ARM_A1_REGNUM
, 4 }, /* r0 ... r12 */
41 { 1, ARM_SP_REGNUM
, 4 },
42 { 1, ARM_LR_REGNUM
, 4 },
43 { 1, ARM_PC_REGNUM
, 4 },
44 { 1, ARM_PS_REGNUM
, 4 },
48 static const struct regcache_map_entry arm_fbsd_vfpregmap
[] =
50 { 32, ARM_D0_REGNUM
, 8 }, /* d0 ... d31 */
51 { 1, ARM_FPSCR_REGNUM
, 4 },
55 /* Register numbers are relative to tdep->tls_regnum. */
57 static const struct regcache_map_entry arm_fbsd_tls_regmap
[] =
59 { 1, 0, 4 }, /* tpidruro */
63 /* In a signal frame, sp points to a 'struct sigframe' which is
69 mcontext_vfp_t sf_vfp;
72 ucontext_t is defined as:
76 mcontext_t uc_mcontext;
80 mcontext_t is defined as:
83 unsigned int __gregs[17];
89 mcontext_vfp_t is defined as:
96 If the VFP state is valid, then mc_vfp_ptr will point to sf_vfp in
97 the sigframe, otherwise it is NULL. There is no non-VFP floating
98 point register state saved in the signal frame. */
100 #define ARM_SIGFRAME_UCONTEXT_OFFSET 64
101 #define ARM_UCONTEXT_MCONTEXT_OFFSET 16
102 #define ARM_MCONTEXT_VFP_PTR_OFFSET 72
104 /* Implement the "init" method of struct tramp_frame. */
107 arm_fbsd_sigframe_init (const struct tramp_frame
*self
,
108 frame_info_ptr this_frame
,
109 struct trad_frame_cache
*this_cache
,
112 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
113 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
114 CORE_ADDR sp
= get_frame_register_unsigned (this_frame
, ARM_SP_REGNUM
);
115 CORE_ADDR mcontext_addr
= (sp
116 + ARM_SIGFRAME_UCONTEXT_OFFSET
117 + ARM_UCONTEXT_MCONTEXT_OFFSET
);
118 ULONGEST mcontext_vfp_addr
;
120 trad_frame_set_reg_regmap (this_cache
, arm_fbsd_gregmap
, mcontext_addr
,
121 regcache_map_entry_size (arm_fbsd_gregmap
));
123 if (safe_read_memory_unsigned_integer (mcontext_addr
124 + ARM_MCONTEXT_VFP_PTR_OFFSET
, 4,
127 && mcontext_vfp_addr
!= 0)
128 trad_frame_set_reg_regmap (this_cache
, arm_fbsd_vfpregmap
, mcontext_vfp_addr
,
129 regcache_map_entry_size (arm_fbsd_vfpregmap
));
131 trad_frame_set_id (this_cache
, frame_id_build (sp
, func
));
134 static const struct tramp_frame arm_fbsd_sigframe
=
139 {0xe1a0000d, ULONGEST_MAX
}, /* mov r0, sp */
140 {0xe2800040, ULONGEST_MAX
}, /* add r0, r0, #SIGF_UC */
141 {0xe59f700c, ULONGEST_MAX
}, /* ldr r7, [pc, #12] */
142 {0xef0001a1, ULONGEST_MAX
}, /* swi SYS_sigreturn */
143 {TRAMP_SENTINEL_INSN
, ULONGEST_MAX
}
145 arm_fbsd_sigframe_init
148 /* Register set definitions. */
150 const struct regset arm_fbsd_gregset
=
153 regcache_supply_regset
, regcache_collect_regset
156 const struct regset arm_fbsd_vfpregset
=
159 regcache_supply_regset
, regcache_collect_regset
163 arm_fbsd_supply_tls_regset (const struct regset
*regset
,
164 struct regcache
*regcache
,
165 int regnum
, const void *buf
, size_t size
)
167 struct gdbarch
*gdbarch
= regcache
->arch ();
168 arm_gdbarch_tdep
*tdep
= gdbarch_tdep
<arm_gdbarch_tdep
> (gdbarch
);
170 regcache
->supply_regset (regset
, tdep
->tls_regnum
, regnum
, buf
, size
);
174 arm_fbsd_collect_tls_regset (const struct regset
*regset
,
175 const struct regcache
*regcache
,
176 int regnum
, void *buf
, size_t size
)
178 struct gdbarch
*gdbarch
= regcache
->arch ();
179 arm_gdbarch_tdep
*tdep
= gdbarch_tdep
<arm_gdbarch_tdep
> (gdbarch
);
181 regcache
->collect_regset (regset
, tdep
->tls_regnum
, regnum
, buf
, size
);
184 const struct regset arm_fbsd_tls_regset
=
187 arm_fbsd_supply_tls_regset
, arm_fbsd_collect_tls_regset
190 /* Implement the "iterate_over_regset_sections" gdbarch method. */
193 arm_fbsd_iterate_over_regset_sections (struct gdbarch
*gdbarch
,
194 iterate_over_regset_sections_cb
*cb
,
196 const struct regcache
*regcache
)
198 arm_gdbarch_tdep
*tdep
= gdbarch_tdep
<arm_gdbarch_tdep
> (gdbarch
);
200 cb (".reg", ARM_FBSD_SIZEOF_GREGSET
, ARM_FBSD_SIZEOF_GREGSET
,
201 &arm_fbsd_gregset
, NULL
, cb_data
);
203 if (tdep
->tls_regnum
> 0)
204 cb (".reg-aarch-tls", ARM_FBSD_SIZEOF_TLSREGSET
, ARM_FBSD_SIZEOF_TLSREGSET
,
205 &arm_fbsd_tls_regset
, NULL
, cb_data
);
207 /* While FreeBSD/arm cores do contain a NT_FPREGSET / ".reg2"
208 register set, it is not populated with register values by the
209 kernel but just contains all zeroes. */
210 if (tdep
->vfp_register_count
> 0)
211 cb (".reg-arm-vfp", ARM_FBSD_SIZEOF_VFPREGSET
, ARM_FBSD_SIZEOF_VFPREGSET
,
212 &arm_fbsd_vfpregset
, "VFP floating-point", cb_data
);
215 /* See arm-fbsd-tdep.h. */
217 const struct target_desc
*
218 arm_fbsd_read_description_auxv (const gdb::optional
<gdb::byte_vector
> &auxv
,
219 target_ops
*target
, gdbarch
*gdbarch
, bool tls
)
221 CORE_ADDR arm_hwcap
= 0;
223 if (!auxv
.has_value ()
224 || target_auxv_search (*auxv
, target
, gdbarch
, AT_FREEBSD_HWCAP
,
226 return arm_read_description (ARM_FP_TYPE_NONE
, tls
);
228 if (arm_hwcap
& HWCAP_VFP
)
230 if (arm_hwcap
& HWCAP_NEON
)
231 return aarch32_read_description ();
232 else if ((arm_hwcap
& (HWCAP_VFPv3
| HWCAP_VFPD32
))
233 == (HWCAP_VFPv3
| HWCAP_VFPD32
))
234 return arm_read_description (ARM_FP_TYPE_VFPV3
, tls
);
236 return arm_read_description (ARM_FP_TYPE_VFPV2
, tls
);
239 return arm_read_description (ARM_FP_TYPE_NONE
, tls
);
242 /* See arm-fbsd-tdep.h. */
244 const struct target_desc
*
245 arm_fbsd_read_description_auxv (bool tls
)
247 gdb::optional
<gdb::byte_vector
> auxv
= target_read_auxv ();
248 return arm_fbsd_read_description_auxv (auxv
,
249 current_inferior ()->top_target (),
250 current_inferior ()->gdbarch
,
254 /* Implement the "core_read_description" gdbarch method. */
256 static const struct target_desc
*
257 arm_fbsd_core_read_description (struct gdbarch
*gdbarch
,
258 struct target_ops
*target
,
261 asection
*tls
= bfd_get_section_by_name (abfd
, ".reg-aarch-tls");
263 gdb::optional
<gdb::byte_vector
> auxv
= target_read_auxv_raw (target
);
264 return arm_fbsd_read_description_auxv (auxv
, target
, gdbarch
, tls
!= nullptr);
267 /* Implement the get_thread_local_address gdbarch method. */
270 arm_fbsd_get_thread_local_address (struct gdbarch
*gdbarch
, ptid_t ptid
,
271 CORE_ADDR lm_addr
, CORE_ADDR offset
)
273 arm_gdbarch_tdep
*tdep
= gdbarch_tdep
<arm_gdbarch_tdep
> (gdbarch
);
274 struct regcache
*regcache
;
276 regcache
= get_thread_arch_regcache (current_inferior ()->process_target (),
279 target_fetch_registers (regcache
, tdep
->tls_regnum
);
282 if (regcache
->cooked_read (tdep
->tls_regnum
, &tpidruro
) != REG_VALID
)
283 error (_("Unable to fetch %%tpidruro"));
285 /* %tpidruro points to the TCB whose first member is the dtv
287 CORE_ADDR dtv_addr
= tpidruro
;
288 return fbsd_get_thread_local_address (gdbarch
, dtv_addr
, lm_addr
, offset
);
291 /* Implement the 'init_osabi' method of struct gdb_osabi_handler. */
294 arm_fbsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
296 arm_gdbarch_tdep
*tdep
= gdbarch_tdep
<arm_gdbarch_tdep
> (gdbarch
);
298 /* Generic FreeBSD support. */
299 fbsd_init_abi (info
, gdbarch
);
301 if (tdep
->fp_model
== ARM_FLOAT_AUTO
)
302 tdep
->fp_model
= ARM_FLOAT_SOFT_VFP
;
304 tramp_frame_prepend_unwinder (gdbarch
, &arm_fbsd_sigframe
);
306 set_solib_svr4_fetch_link_map_offsets
307 (gdbarch
, svr4_ilp32_fetch_link_map_offsets
);
310 tdep
->jb_elt_size
= 4;
312 set_gdbarch_iterate_over_regset_sections
313 (gdbarch
, arm_fbsd_iterate_over_regset_sections
);
314 set_gdbarch_core_read_description (gdbarch
, arm_fbsd_core_read_description
);
316 if (tdep
->tls_regnum
> 0)
318 set_gdbarch_fetch_tls_load_module_address (gdbarch
,
319 svr4_fetch_objfile_link_map
);
320 set_gdbarch_get_thread_local_address (gdbarch
,
321 arm_fbsd_get_thread_local_address
);
324 /* Single stepping. */
325 set_gdbarch_software_single_step (gdbarch
, arm_software_single_step
);
328 void _initialize_arm_fbsd_tdep ();
330 _initialize_arm_fbsd_tdep ()
332 gdbarch_register_osabi (bfd_arch_arm
, 0, GDB_OSABI_FREEBSD
,