1 /* Target-dependent code for FreeBSD/aarch64.
3 Copyright (C) 2017-2018 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/>. */
23 #include "fbsd-tdep.h"
24 #include "aarch64-tdep.h"
25 #include "aarch64-fbsd-tdep.h"
27 #include "solib-svr4.h"
29 #include "tramp-frame.h"
30 #include "trad-frame.h"
32 /* In a signal frame, sp points to a 'struct sigframe' which is
40 ucontext_t is defined as:
44 mcontext_t uc_mcontext;
48 The mcontext_t contains the general purpose register set followed
49 by the floating point register set. The floating point register
50 set is only valid if the _MC_FP_VALID flag is set in mc_flags. */
52 #define AARCH64_MCONTEXT_REG_SIZE 8
53 #define AARCH64_MCONTEXT_FPREG_SIZE 16
54 #define AARCH64_SIGFRAME_UCONTEXT_OFFSET 80
55 #define AARCH64_UCONTEXT_MCONTEXT_OFFSET 16
56 #define AARCH64_MCONTEXT_FPREGS_OFFSET 272
57 #define AARCH64_MCONTEXT_FLAGS_OFFSET 800
58 #define AARCH64_MCONTEXT_FLAG_FP_VALID 0x1
60 /* Implement the "init" method of struct tramp_frame. */
63 aarch64_fbsd_sigframe_init (const struct tramp_frame *self,
64 struct frame_info *this_frame,
65 struct trad_frame_cache *this_cache,
68 struct gdbarch *gdbarch = get_frame_arch (this_frame);
69 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
70 CORE_ADDR sp = get_frame_register_unsigned (this_frame, AARCH64_SP_REGNUM);
71 CORE_ADDR mcontext_addr =
73 + AARCH64_SIGFRAME_UCONTEXT_OFFSET
74 + AARCH64_UCONTEXT_MCONTEXT_OFFSET;
78 for (i = 0; i < 30; i++)
80 trad_frame_set_reg_addr (this_cache,
81 AARCH64_X0_REGNUM + i,
82 mcontext_addr + i * AARCH64_MCONTEXT_REG_SIZE);
84 trad_frame_set_reg_addr (this_cache, AARCH64_LR_REGNUM,
85 mcontext_addr + 30 * AARCH64_MCONTEXT_REG_SIZE);
86 trad_frame_set_reg_addr (this_cache, AARCH64_SP_REGNUM,
87 mcontext_addr + 31 * AARCH64_MCONTEXT_REG_SIZE);
88 trad_frame_set_reg_addr (this_cache, AARCH64_PC_REGNUM,
89 mcontext_addr + 32 * AARCH64_MCONTEXT_REG_SIZE);
90 trad_frame_set_reg_addr (this_cache, AARCH64_CPSR_REGNUM,
91 mcontext_addr + 33 * AARCH64_MCONTEXT_REG_SIZE);
93 if (target_read_memory (mcontext_addr + AARCH64_MCONTEXT_FLAGS_OFFSET, buf,
95 && (extract_unsigned_integer (buf, 4, byte_order)
96 & AARCH64_MCONTEXT_FLAG_FP_VALID))
98 for (i = 0; i < 32; i++)
100 trad_frame_set_reg_addr (this_cache, AARCH64_V0_REGNUM + i,
102 + AARCH64_MCONTEXT_FPREGS_OFFSET
103 + i * AARCH64_MCONTEXT_FPREG_SIZE);
105 trad_frame_set_reg_addr (this_cache, AARCH64_FPSR_REGNUM,
106 mcontext_addr + AARCH64_MCONTEXT_FPREGS_OFFSET
107 + 32 * AARCH64_MCONTEXT_FPREG_SIZE);
108 trad_frame_set_reg_addr (this_cache, AARCH64_FPCR_REGNUM,
109 mcontext_addr + AARCH64_MCONTEXT_FPREGS_OFFSET
110 + 32 * AARCH64_MCONTEXT_FPREG_SIZE + 4);
113 trad_frame_set_id (this_cache, frame_id_build (sp, func));
116 static const struct tramp_frame aarch64_fbsd_sigframe =
121 {0x910003e0, -1}, /* mov x0, sp */
122 {0x91014000, -1}, /* add x0, x0, #SF_UC */
123 {0xd2803428, -1}, /* mov x8, #SYS_sigreturn */
124 {0xd4000001, -1}, /* svc 0x0 */
125 {TRAMP_SENTINEL_INSN, -1}
127 aarch64_fbsd_sigframe_init
132 static const struct regcache_map_entry aarch64_fbsd_gregmap[] =
134 { 30, AARCH64_X0_REGNUM, 8 }, /* x0 ... x29 */
135 { 1, AARCH64_LR_REGNUM, 8 },
136 { 1, AARCH64_SP_REGNUM, 8 },
137 { 1, AARCH64_PC_REGNUM, 8 },
138 { 1, AARCH64_CPSR_REGNUM, 4 },
142 static const struct regcache_map_entry aarch64_fbsd_fpregmap[] =
144 { 32, AARCH64_V0_REGNUM, 16 }, /* v0 ... v31 */
145 { 1, AARCH64_FPSR_REGNUM, 4 },
146 { 1, AARCH64_FPCR_REGNUM, 4 },
150 /* Register set definitions. */
152 const struct regset aarch64_fbsd_gregset =
154 aarch64_fbsd_gregmap,
155 regcache_supply_regset, regcache_collect_regset
158 const struct regset aarch64_fbsd_fpregset =
160 aarch64_fbsd_fpregmap,
161 regcache_supply_regset, regcache_collect_regset
164 /* Implement the "regset_from_core_section" gdbarch method. */
167 aarch64_fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
168 iterate_over_regset_sections_cb *cb,
170 const struct regcache *regcache)
172 cb (".reg", AARCH64_FBSD_SIZEOF_GREGSET, AARCH64_FBSD_SIZEOF_GREGSET,
173 &aarch64_fbsd_gregset, NULL, cb_data);
174 cb (".reg2", AARCH64_FBSD_SIZEOF_FPREGSET, AARCH64_FBSD_SIZEOF_FPREGSET,
175 &aarch64_fbsd_fpregset, NULL, cb_data);
178 /* Implement the 'init_osabi' method of struct gdb_osabi_handler. */
181 aarch64_fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
183 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
185 /* Generic FreeBSD support. */
186 fbsd_init_abi (info, gdbarch);
188 set_solib_svr4_fetch_link_map_offsets (gdbarch,
189 svr4_lp64_fetch_link_map_offsets);
191 tramp_frame_prepend_unwinder (gdbarch, &aarch64_fbsd_sigframe);
193 /* Enable longjmp. */
196 set_gdbarch_iterate_over_regset_sections
197 (gdbarch, aarch64_fbsd_iterate_over_regset_sections);
201 _initialize_aarch64_fbsd_tdep (void)
203 gdbarch_register_osabi (bfd_arch_aarch64, 0, GDB_OSABI_FREEBSD,
204 aarch64_fbsd_init_abi);