1 /* Target-dependent code for FreeBSD/aarch64.
3 Copyright (C) 2017-2019 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 /* Local non-gdb includes. */
23 #include "aarch64-fbsd-tdep.h"
24 #include "aarch64-tdep.h"
25 #include "fbsd-tdep.h"
28 #include "solib-svr4.h"
30 #include "trad-frame.h"
31 #include "tramp-frame.h"
35 static const struct regcache_map_entry aarch64_fbsd_gregmap
[] =
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 },
45 static const struct regcache_map_entry aarch64_fbsd_fpregmap
[] =
47 { 32, AARCH64_V0_REGNUM
, 16 }, /* v0 ... v31 */
48 { 1, AARCH64_FPSR_REGNUM
, 4 },
49 { 1, AARCH64_FPCR_REGNUM
, 4 },
53 /* In a signal frame, sp points to a 'struct sigframe' which is
61 ucontext_t is defined as:
65 mcontext_t uc_mcontext;
69 The mcontext_t contains the general purpose register set followed
70 by the floating point register set. The floating point register
71 set is only valid if the _MC_FP_VALID flag is set in mc_flags. */
73 #define AARCH64_SIGFRAME_UCONTEXT_OFFSET 80
74 #define AARCH64_UCONTEXT_MCONTEXT_OFFSET 16
75 #define AARCH64_MCONTEXT_FPREGS_OFFSET 272
76 #define AARCH64_MCONTEXT_FLAGS_OFFSET 800
77 #define AARCH64_MCONTEXT_FLAG_FP_VALID 0x1
79 /* Implement the "init" method of struct tramp_frame. */
82 aarch64_fbsd_sigframe_init (const struct tramp_frame
*self
,
83 struct frame_info
*this_frame
,
84 struct trad_frame_cache
*this_cache
,
87 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
88 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
89 CORE_ADDR sp
= get_frame_register_unsigned (this_frame
, AARCH64_SP_REGNUM
);
90 CORE_ADDR mcontext_addr
92 + AARCH64_SIGFRAME_UCONTEXT_OFFSET
93 + AARCH64_UCONTEXT_MCONTEXT_OFFSET
);
96 trad_frame_set_reg_regmap (this_cache
, aarch64_fbsd_gregmap
, mcontext_addr
,
97 regcache_map_entry_size (aarch64_fbsd_gregmap
));
99 if (target_read_memory (mcontext_addr
+ AARCH64_MCONTEXT_FLAGS_OFFSET
, buf
,
101 && (extract_unsigned_integer (buf
, 4, byte_order
)
102 & AARCH64_MCONTEXT_FLAG_FP_VALID
))
103 trad_frame_set_reg_regmap (this_cache
, aarch64_fbsd_fpregmap
,
104 mcontext_addr
+ AARCH64_MCONTEXT_FPREGS_OFFSET
,
105 regcache_map_entry_size (aarch64_fbsd_fpregmap
));
107 trad_frame_set_id (this_cache
, frame_id_build (sp
, func
));
110 static const struct tramp_frame aarch64_fbsd_sigframe
=
115 {0x910003e0, ULONGEST_MAX
}, /* mov x0, sp */
116 {0x91014000, ULONGEST_MAX
}, /* add x0, x0, #SF_UC */
117 {0xd2803428, ULONGEST_MAX
}, /* mov x8, #SYS_sigreturn */
118 {0xd4000001, ULONGEST_MAX
}, /* svc 0x0 */
119 {TRAMP_SENTINEL_INSN
, ULONGEST_MAX
}
121 aarch64_fbsd_sigframe_init
124 /* Register set definitions. */
126 const struct regset aarch64_fbsd_gregset
=
128 aarch64_fbsd_gregmap
,
129 regcache_supply_regset
, regcache_collect_regset
132 const struct regset aarch64_fbsd_fpregset
=
134 aarch64_fbsd_fpregmap
,
135 regcache_supply_regset
, regcache_collect_regset
138 /* Implement the "regset_from_core_section" gdbarch method. */
141 aarch64_fbsd_iterate_over_regset_sections (struct gdbarch
*gdbarch
,
142 iterate_over_regset_sections_cb
*cb
,
144 const struct regcache
*regcache
)
146 cb (".reg", AARCH64_FBSD_SIZEOF_GREGSET
, AARCH64_FBSD_SIZEOF_GREGSET
,
147 &aarch64_fbsd_gregset
, NULL
, cb_data
);
148 cb (".reg2", AARCH64_FBSD_SIZEOF_FPREGSET
, AARCH64_FBSD_SIZEOF_FPREGSET
,
149 &aarch64_fbsd_fpregset
, NULL
, cb_data
);
152 /* Implement the 'init_osabi' method of struct gdb_osabi_handler. */
155 aarch64_fbsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
157 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
159 /* Generic FreeBSD support. */
160 fbsd_init_abi (info
, gdbarch
);
162 set_solib_svr4_fetch_link_map_offsets (gdbarch
,
163 svr4_lp64_fetch_link_map_offsets
);
165 tramp_frame_prepend_unwinder (gdbarch
, &aarch64_fbsd_sigframe
);
167 /* Enable longjmp. */
170 set_gdbarch_iterate_over_regset_sections
171 (gdbarch
, aarch64_fbsd_iterate_over_regset_sections
);
175 _initialize_aarch64_fbsd_tdep (void)
177 gdbarch_register_osabi (bfd_arch_aarch64
, 0, GDB_OSABI_FREEBSD
,
178 aarch64_fbsd_init_abi
);