1 /* libunwind - a platform-independent unwind library 2 Copyright (C) 2001-2004 Hewlett-Packard Co 3 Contributed by David Mosberger-Tang <davidm@hpl.hp.com> 4 Copyright (C) 2013 Linaro Limited 5 6 This file is part of libunwind. 7 8 Permission is hereby granted, free of charge, to any person obtaining 9 a copy of this software and associated documentation files (the 10 "Software"), to deal in the Software without restriction, including 11 without limitation the rights to use, copy, modify, merge, publish, 12 distribute, sublicense, and/or sell copies of the Software, and to 13 permit persons to whom the Software is furnished to do so, subject to 14 the following conditions: 15 16 The above copyright notice and this permission notice shall be 17 included in all copies or substantial portions of the Software. 18 19 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 20 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 21 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 22 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 23 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 24 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 25 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ 26 27 #ifndef LIBUNWIND_H 28 #define LIBUNWIND_H 29 30 #if defined(__cplusplus) || defined(c_plusplus) 31 extern "C" { 32 #endif 33 34 #include <inttypes.h> 35 #include <stddef.h> 36 #include <ucontext.h> 37 #include <stdalign.h> 38 39 #ifndef UNW_EMPTY_STRUCT 40 # define UNW_EMPTY_STRUCT uint8_t unused; 41 #endif 42 43 #define UNW_TARGET aarch64 44 #define UNW_TARGET_AARCH64 1 45 46 #define _U_TDEP_QP_TRUE 0 /* see libunwind-dynamic.h */ 47 48 /* This needs to be big enough to accommodate "struct cursor", while 49 leaving some slack for future expansion. Changing this value will 50 require recompiling all users of this library. Stack allocation is 51 relatively cheap and unwind-state copying is relatively rare, so we 52 want to err on making it rather too big than too small. 53 54 Calculation is regs used (64 + 34) * 2 + 40 (bytes of rest of 55 cursor) + padding 56 */ 57 58 #define UNW_TDEP_CURSOR_LEN 1024 59 60 typedef uint64_t unw_word_t; 61 typedef int64_t unw_sword_t; 62 63 typedef long double unw_tdep_fpreg_t; 64 65 typedef struct 66 { 67 /* no aarch64-specific auxiliary proc-info */ 68 UNW_EMPTY_STRUCT 69 } 70 unw_tdep_proc_info_t; 71 72 typedef enum 73 { 74 /* 64-bit general registers. */ 75 UNW_AARCH64_X0, 76 UNW_AARCH64_X1, 77 UNW_AARCH64_X2, 78 UNW_AARCH64_X3, 79 UNW_AARCH64_X4, 80 UNW_AARCH64_X5, 81 UNW_AARCH64_X6, 82 UNW_AARCH64_X7, 83 UNW_AARCH64_X8, 84 85 /* Temporary registers. */ 86 UNW_AARCH64_X9, 87 UNW_AARCH64_X10, 88 UNW_AARCH64_X11, 89 UNW_AARCH64_X12, 90 UNW_AARCH64_X13, 91 UNW_AARCH64_X14, 92 UNW_AARCH64_X15, 93 94 /* Intra-procedure-call temporary registers. */ 95 UNW_AARCH64_X16, 96 UNW_AARCH64_X17, 97 98 /* Callee-saved registers. */ 99 UNW_AARCH64_X18, 100 UNW_AARCH64_X19, 101 UNW_AARCH64_X20, 102 UNW_AARCH64_X21, 103 UNW_AARCH64_X22, 104 UNW_AARCH64_X23, 105 UNW_AARCH64_X24, 106 UNW_AARCH64_X25, 107 UNW_AARCH64_X26, 108 UNW_AARCH64_X27, 109 UNW_AARCH64_X28, 110 111 /* 64-bit frame pointer. */ 112 UNW_AARCH64_X29, 113 114 /* 64-bit link register. */ 115 UNW_AARCH64_X30, 116 117 /* 64-bit stack pointer. */ 118 UNW_AARCH64_SP = 31, 119 UNW_AARCH64_PC, 120 UNW_AARCH64_PSTATE, 121 122 /* 128-bit FP/Advanced SIMD registers. */ 123 UNW_AARCH64_V0 = 64, 124 UNW_AARCH64_V1, 125 UNW_AARCH64_V2, 126 UNW_AARCH64_V3, 127 UNW_AARCH64_V4, 128 UNW_AARCH64_V5, 129 UNW_AARCH64_V6, 130 UNW_AARCH64_V7, 131 UNW_AARCH64_V8, 132 UNW_AARCH64_V9, 133 UNW_AARCH64_V10, 134 UNW_AARCH64_V11, 135 UNW_AARCH64_V12, 136 UNW_AARCH64_V13, 137 UNW_AARCH64_V14, 138 UNW_AARCH64_V15, 139 UNW_AARCH64_V16, 140 UNW_AARCH64_V17, 141 UNW_AARCH64_V18, 142 UNW_AARCH64_V19, 143 UNW_AARCH64_V20, 144 UNW_AARCH64_V21, 145 UNW_AARCH64_V22, 146 UNW_AARCH64_V23, 147 UNW_AARCH64_V24, 148 UNW_AARCH64_V25, 149 UNW_AARCH64_V26, 150 UNW_AARCH64_V27, 151 UNW_AARCH64_V28, 152 UNW_AARCH64_V29, 153 UNW_AARCH64_V30, 154 UNW_AARCH64_V31, 155 156 UNW_AARCH64_FPSR, 157 UNW_AARCH64_FPCR, 158 159 /* For AArch64, the CFA is the value of SP (x31) at the call site of the 160 previous frame. */ 161 UNW_AARCH64_CFA = UNW_AARCH64_SP, 162 163 UNW_TDEP_LAST_REG = UNW_AARCH64_FPCR, 164 165 UNW_TDEP_IP = UNW_AARCH64_X30, 166 UNW_TDEP_SP = UNW_AARCH64_SP, 167 UNW_TDEP_EH = UNW_AARCH64_X0 168 169 } 170 aarch64_regnum_t; 171 172 /* Use R0 through R3 to pass exception handling information. */ 173 #define UNW_TDEP_NUM_EH_REGS 4 174 175 typedef struct unw_tdep_save_loc 176 { 177 /* Additional target-dependent info on a save location. */ 178 UNW_EMPTY_STRUCT 179 } 180 unw_tdep_save_loc_t; 181 182 #ifdef __linux__ 183 /* On AArch64, we can directly use ucontext_t as the unwind context, 184 * however, the __reserved struct is quite large: tune it down to only 185 * the necessary used fields. */ 186 187 struct unw_sigcontext 188 { 189 uint64_t fault_address; 190 uint64_t regs[31]; 191 uint64_t sp; 192 uint64_t pc; 193 uint64_t pstate; 194 alignas(16) uint8_t __reserved[(66 * 8)]; 195 }; 196 197 typedef struct 198 { 199 unsigned long uc_flags; 200 struct ucontext *uc_link; 201 stack_t uc_stack; 202 #ifndef __ANDROID__ 203 sigset_t uc_sigmask; 204 #else 205 union { 206 sigset_t uc_sigmask; 207 sigset64_t uc_sigmask64; 208 }; 209 char __padding[128 - sizeof(sigset_t)]; 210 #endif 211 struct unw_sigcontext uc_mcontext; 212 } unw_tdep_context_t; 213 214 typedef struct 215 { 216 uint32_t _ctx_magic; 217 uint32_t _ctx_size; 218 uint32_t fpsr; 219 uint32_t fpcr; 220 uint64_t vregs[64]; 221 } unw_fpsimd_context_t; 222 #else 223 /* On AArch64, we can directly use ucontext_t as the unwind context. */ 224 typedef ucontext_t unw_tdep_context_t; 225 #endif 226 227 228 #include "libunwind-common.h" 229 #include "libunwind-dynamic.h" 230 231 #define UNW_BASE register uint64_t unw_base __asm__ ("x0") = (uint64_t) unw_ctx->uc_mcontext.regs; 232 233 #define unw_tdep_getcontext(uc) ({ \ 234 unw_tdep_context_t *unw_ctx = (uc); \ 235 UNW_BASE \ 236 __asm__ __volatile__ ( \ 237 "stp x0, x1, [%[base], #0]\n" \ 238 "stp x2, x3, [%[base], #16]\n" \ 239 "stp x4, x5, [%[base], #32]\n" \ 240 "stp x6, x7, [%[base], #48]\n" \ 241 "stp x8, x9, [%[base], #64]\n" \ 242 "stp x10, x11, [%[base], #80]\n" \ 243 "stp x12, x13, [%[base], #96]\n" \ 244 "stp x14, x15, [%[base], #112]\n" \ 245 "stp x16, x17, [%[base], #128]\n" \ 246 "stp x18, x19, [%[base], #144]\n" \ 247 "stp x20, x21, [%[base], #160]\n" \ 248 "stp x22, x23, [%[base], #176]\n" \ 249 "stp x24, x25, [%[base], #192]\n" \ 250 "stp x26, x27, [%[base], #208]\n" \ 251 "stp x28, x29, [%[base], #224]\n" \ 252 "mov x1, sp\n" \ 253 "stp x30, x1, [%[base], #240]\n" \ 254 "adr x1, ret%=\n" \ 255 "str x1, [%[base], #256]\n" \ 256 "mov %[base], #0\n" \ 257 "ret%=:\n" \ 258 : [base] "+r" (unw_base) : : "x1", "memory"); \ 259 (int)unw_base; }) 260 #define unw_tdep_is_fpreg UNW_ARCH_OBJ(is_fpreg) 261 262 extern int unw_tdep_is_fpreg (int); 263 264 #if defined(__cplusplus) || defined(c_plusplus) 265 } 266 #endif 267 268 #endif /* LIBUNWIND_H */ 269