1/* Target-dependent code for FreeBSD/aarch64. 2 3 Copyright (C) 2017-2020 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 34static 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 44static 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 80static void 81aarch64_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 109static 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 125const struct regset aarch64_fbsd_gregset = 126 { 127 aarch64_fbsd_gregmap, 128 regcache_supply_regset, regcache_collect_regset 129 }; 130 131const struct regset aarch64_fbsd_fpregset = 132 { 133 aarch64_fbsd_fpregmap, 134 regcache_supply_regset, regcache_collect_regset 135 }; 136 137/* Implement the "iterate_over_regset_sections" gdbarch method. */ 138 139static void 140aarch64_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 153static void 154aarch64_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 173void _initialize_aarch64_fbsd_tdep (); 174void 175_initialize_aarch64_fbsd_tdep () 176{ 177 gdbarch_register_osabi (bfd_arch_aarch64, 0, GDB_OSABI_FREEBSD, 178 aarch64_fbsd_init_abi); 179} 180