1 /* libunwind - a platform-independent unwind library 2 Copyright (C) 2012 Tommi Rantala <tt.rantala (at) gmail.com> 3 4 This file is part of libunwind. 5 6 Permission is hereby granted, free of charge, to any person obtaining 7 a copy of this software and associated documentation files (the 8 "Software"), to deal in the Software without restriction, including 9 without limitation the rights to use, copy, modify, merge, publish, 10 distribute, sublicense, and/or sell copies of the Software, and to 11 permit persons to whom the Software is furnished to do so, subject to 12 the following conditions: 13 14 The above copyright notice and this permission notice shall be 15 included in all copies or substantial portions of the Software. 16 17 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 18 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 19 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 20 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 21 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 22 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 23 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ 24 25 #include "_UCD_lib.h" 26 27 #include "_UCD_internal.h" 28 29 int 30 _UCD_access_reg (unw_addr_space_t as, 31 unw_regnum_t regnum, unw_word_t *valp, 32 int write, void *arg) 33 { 34 struct UCD_info *ui = arg; 35 36 if (write) 37 { 38 Debug(0, "write is not supported\n"); 39 return -UNW_EINVAL; 40 } 41 42 #if defined(UNW_TARGET_AARCH64) 43 if (regnum < 0 || regnum >= UNW_AARCH64_FPCR) 44 goto badreg; 45 #elif defined(UNW_TARGET_ARM) 46 if (regnum < 0 || regnum >= 16) 47 goto badreg; 48 #elif defined(UNW_TARGET_SH) 49 if (regnum < 0 || regnum > UNW_SH_PR) 50 goto badreg; 51 #else 52 #if defined(UNW_TARGET_MIPS) 53 static const uint8_t remap_regs[] = 54 { 55 [UNW_MIPS_R0] = EF_REG0, 56 [UNW_MIPS_R1] = EF_REG1, 57 [UNW_MIPS_R2] = EF_REG2, 58 [UNW_MIPS_R3] = EF_REG3, 59 [UNW_MIPS_R4] = EF_REG4, 60 [UNW_MIPS_R5] = EF_REG5, 61 [UNW_MIPS_R6] = EF_REG6, 62 [UNW_MIPS_R7] = EF_REG7, 63 [UNW_MIPS_R8] = EF_REG8, 64 [UNW_MIPS_R9] = EF_REG9, 65 [UNW_MIPS_R10] = EF_REG10, 66 [UNW_MIPS_R11] = EF_REG11, 67 [UNW_MIPS_R12] = EF_REG12, 68 [UNW_MIPS_R13] = EF_REG13, 69 [UNW_MIPS_R14] = EF_REG14, 70 [UNW_MIPS_R15] = EF_REG15, 71 [UNW_MIPS_R16] = EF_REG16, 72 [UNW_MIPS_R17] = EF_REG17, 73 [UNW_MIPS_R18] = EF_REG18, 74 [UNW_MIPS_R19] = EF_REG19, 75 [UNW_MIPS_R20] = EF_REG20, 76 [UNW_MIPS_R21] = EF_REG21, 77 [UNW_MIPS_R22] = EF_REG22, 78 [UNW_MIPS_R23] = EF_REG23, 79 [UNW_MIPS_R24] = EF_REG24, 80 [UNW_MIPS_R25] = EF_REG25, 81 [UNW_MIPS_R28] = EF_REG28, 82 [UNW_MIPS_R29] = EF_REG29, 83 [UNW_MIPS_R30] = EF_REG30, 84 [UNW_MIPS_R31] = EF_REG31, 85 [UNW_MIPS_PC] = EF_CP0_EPC, 86 }; 87 #elif defined(UNW_TARGET_X86) 88 static const uint8_t remap_regs[] = 89 { 90 /* names from libunwind-x86.h */ 91 [UNW_X86_EAX] = offsetof(struct user_regs_struct, eax) / sizeof(long), 92 [UNW_X86_EDX] = offsetof(struct user_regs_struct, edx) / sizeof(long), 93 [UNW_X86_ECX] = offsetof(struct user_regs_struct, ecx) / sizeof(long), 94 [UNW_X86_EBX] = offsetof(struct user_regs_struct, ebx) / sizeof(long), 95 [UNW_X86_ESI] = offsetof(struct user_regs_struct, esi) / sizeof(long), 96 [UNW_X86_EDI] = offsetof(struct user_regs_struct, edi) / sizeof(long), 97 [UNW_X86_EBP] = offsetof(struct user_regs_struct, ebp) / sizeof(long), 98 [UNW_X86_ESP] = offsetof(struct user_regs_struct, esp) / sizeof(long), 99 [UNW_X86_EIP] = offsetof(struct user_regs_struct, eip) / sizeof(long), 100 [UNW_X86_EFLAGS] = offsetof(struct user_regs_struct, eflags) / sizeof(long), 101 [UNW_X86_TRAPNO] = offsetof(struct user_regs_struct, orig_eax) / sizeof(long), 102 }; 103 #elif defined(UNW_TARGET_X86_64) 104 static const int8_t remap_regs[] = 105 { 106 [UNW_X86_64_RAX] = offsetof(struct user_regs_struct, rax) / sizeof(long), 107 [UNW_X86_64_RDX] = offsetof(struct user_regs_struct, rdx) / sizeof(long), 108 [UNW_X86_64_RCX] = offsetof(struct user_regs_struct, rcx) / sizeof(long), 109 [UNW_X86_64_RBX] = offsetof(struct user_regs_struct, rbx) / sizeof(long), 110 [UNW_X86_64_RSI] = offsetof(struct user_regs_struct, rsi) / sizeof(long), 111 [UNW_X86_64_RDI] = offsetof(struct user_regs_struct, rdi) / sizeof(long), 112 [UNW_X86_64_RBP] = offsetof(struct user_regs_struct, rbp) / sizeof(long), 113 [UNW_X86_64_RSP] = offsetof(struct user_regs_struct, rsp) / sizeof(long), 114 [UNW_X86_64_RIP] = offsetof(struct user_regs_struct, rip) / sizeof(long), 115 }; 116 #else 117 #error Port me 118 #endif 119 120 if (regnum < 0 || regnum >= (unw_regnum_t)ARRAY_SIZE(remap_regs)) 121 goto badreg; 122 123 regnum = remap_regs[regnum]; 124 #endif 125 126 /* pr_reg is a long[] array, but it contains struct user_regs_struct's 127 * image. 128 */ 129 Debug(1, "pr_reg[%d]:%ld (0x%lx)\n", regnum, 130 (long)ui->prstatus->pr_reg[regnum], 131 (long)ui->prstatus->pr_reg[regnum] 132 ); 133 *valp = ui->prstatus->pr_reg[regnum]; 134 135 return 0; 136 137 badreg: 138 Debug(0, "bad regnum:%d\n", regnum); 139 return -UNW_EINVAL; 140 } 141