| 1 | /* Target-dependent code for FreeBSD/aarch64. |
| 2 | |
| 3 | Copyright (C) 2017-2019 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 "osabi.h" |
| 27 | #include "solib-svr4.h" |
| 28 | #include "target.h" |
| 29 | #include "tramp-frame.h" |
| 30 | #include "trad-frame.h" |
| 31 | |
| 32 | /* Register maps. */ |
| 33 | |
| 34 | static const struct regcache_map_entry aarch64_fbsd_gregmap[] = |
| 35 | { |
| 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 }, |
| 41 | { 0 } |
| 42 | }; |
| 43 | |
| 44 | static const struct regcache_map_entry aarch64_fbsd_fpregmap[] = |
| 45 | { |
| 46 | { 32, AARCH64_V0_REGNUM, 16 }, /* v0 ... v31 */ |
| 47 | { 1, AARCH64_FPSR_REGNUM, 4 }, |
| 48 | { 1, AARCH64_FPCR_REGNUM, 4 }, |
| 49 | { 0 } |
| 50 | }; |
| 51 | |
| 52 | /* In a signal frame, sp points to a 'struct sigframe' which is |
| 53 | defined as: |
| 54 | |
| 55 | struct sigframe { |
| 56 | siginfo_t sf_si; |
| 57 | ucontext_t sf_uc; |
| 58 | }; |
| 59 | |
| 60 | ucontext_t is defined as: |
| 61 | |
| 62 | struct __ucontext { |
| 63 | sigset_t uc_sigmask; |
| 64 | mcontext_t uc_mcontext; |
| 65 | ... |
| 66 | }; |
| 67 | |
| 68 | The mcontext_t contains the general purpose register set followed |
| 69 | by the floating point register set. The floating point register |
| 70 | set is only valid if the _MC_FP_VALID flag is set in mc_flags. */ |
| 71 | |
| 72 | #define AARCH64_SIGFRAME_UCONTEXT_OFFSET 80 |
| 73 | #define AARCH64_UCONTEXT_MCONTEXT_OFFSET 16 |
| 74 | #define AARCH64_MCONTEXT_FPREGS_OFFSET 272 |
| 75 | #define AARCH64_MCONTEXT_FLAGS_OFFSET 800 |
| 76 | #define AARCH64_MCONTEXT_FLAG_FP_VALID 0x1 |
| 77 | |
| 78 | /* Implement the "init" method of struct tramp_frame. */ |
| 79 | |
| 80 | static void |
| 81 | aarch64_fbsd_sigframe_init (const struct tramp_frame *self, |
| 82 | struct frame_info *this_frame, |
| 83 | struct trad_frame_cache *this_cache, |
| 84 | CORE_ADDR func) |
| 85 | { |
| 86 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 87 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 88 | CORE_ADDR sp = get_frame_register_unsigned (this_frame, AARCH64_SP_REGNUM); |
| 89 | CORE_ADDR mcontext_addr |
| 90 | = (sp |
| 91 | + AARCH64_SIGFRAME_UCONTEXT_OFFSET |
| 92 | + AARCH64_UCONTEXT_MCONTEXT_OFFSET); |
| 93 | gdb_byte buf[4]; |
| 94 | |
| 95 | trad_frame_set_reg_regmap (this_cache, aarch64_fbsd_gregmap, mcontext_addr, |
| 96 | regcache_map_entry_size (aarch64_fbsd_gregmap)); |
| 97 | |
| 98 | if (target_read_memory (mcontext_addr + AARCH64_MCONTEXT_FLAGS_OFFSET, buf, |
| 99 | 4) == 0 |
| 100 | && (extract_unsigned_integer (buf, 4, byte_order) |
| 101 | & AARCH64_MCONTEXT_FLAG_FP_VALID)) |
| 102 | trad_frame_set_reg_regmap (this_cache, aarch64_fbsd_fpregmap, |
| 103 | mcontext_addr + AARCH64_MCONTEXT_FPREGS_OFFSET, |
| 104 | regcache_map_entry_size (aarch64_fbsd_fpregmap)); |
| 105 | |
| 106 | trad_frame_set_id (this_cache, frame_id_build (sp, func)); |
| 107 | } |
| 108 | |
| 109 | static const struct tramp_frame aarch64_fbsd_sigframe = |
| 110 | { |
| 111 | SIGTRAMP_FRAME, |
| 112 | 4, |
| 113 | { |
| 114 | {0x910003e0, ULONGEST_MAX}, /* mov x0, sp */ |
| 115 | {0x91014000, ULONGEST_MAX}, /* add x0, x0, #SF_UC */ |
| 116 | {0xd2803428, ULONGEST_MAX}, /* mov x8, #SYS_sigreturn */ |
| 117 | {0xd4000001, ULONGEST_MAX}, /* svc 0x0 */ |
| 118 | {TRAMP_SENTINEL_INSN, ULONGEST_MAX} |
| 119 | }, |
| 120 | aarch64_fbsd_sigframe_init |
| 121 | }; |
| 122 | |
| 123 | /* Register set definitions. */ |
| 124 | |
| 125 | const struct regset aarch64_fbsd_gregset = |
| 126 | { |
| 127 | aarch64_fbsd_gregmap, |
| 128 | regcache_supply_regset, regcache_collect_regset |
| 129 | }; |
| 130 | |
| 131 | const struct regset aarch64_fbsd_fpregset = |
| 132 | { |
| 133 | aarch64_fbsd_fpregmap, |
| 134 | regcache_supply_regset, regcache_collect_regset |
| 135 | }; |
| 136 | |
| 137 | /* Implement the "regset_from_core_section" gdbarch method. */ |
| 138 | |
| 139 | static void |
| 140 | aarch64_fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch, |
| 141 | iterate_over_regset_sections_cb *cb, |
| 142 | void *cb_data, |
| 143 | const struct regcache *regcache) |
| 144 | { |
| 145 | cb (".reg", AARCH64_FBSD_SIZEOF_GREGSET, AARCH64_FBSD_SIZEOF_GREGSET, |
| 146 | &aarch64_fbsd_gregset, NULL, cb_data); |
| 147 | cb (".reg2", AARCH64_FBSD_SIZEOF_FPREGSET, AARCH64_FBSD_SIZEOF_FPREGSET, |
| 148 | &aarch64_fbsd_fpregset, NULL, cb_data); |
| 149 | } |
| 150 | |
| 151 | /* Implement the 'init_osabi' method of struct gdb_osabi_handler. */ |
| 152 | |
| 153 | static void |
| 154 | aarch64_fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 155 | { |
| 156 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 157 | |
| 158 | /* Generic FreeBSD support. */ |
| 159 | fbsd_init_abi (info, gdbarch); |
| 160 | |
| 161 | set_solib_svr4_fetch_link_map_offsets (gdbarch, |
| 162 | svr4_lp64_fetch_link_map_offsets); |
| 163 | |
| 164 | tramp_frame_prepend_unwinder (gdbarch, &aarch64_fbsd_sigframe); |
| 165 | |
| 166 | /* Enable longjmp. */ |
| 167 | tdep->jb_pc = 13; |
| 168 | |
| 169 | set_gdbarch_iterate_over_regset_sections |
| 170 | (gdbarch, aarch64_fbsd_iterate_over_regset_sections); |
| 171 | } |
| 172 | |
| 173 | void |
| 174 | _initialize_aarch64_fbsd_tdep (void) |
| 175 | { |
| 176 | gdbarch_register_osabi (bfd_arch_aarch64, 0, GDB_OSABI_FREEBSD, |
| 177 | aarch64_fbsd_init_abi); |
| 178 | } |