1 /* 2 * Copyright (C) 2013 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <private/bionic_asm.h> 30 31 // DWARF constants. 32 #define DW_CFA_def_cfa_expression 0x0f 33 #define DW_CFA_expression 0x10 34 #define DW_EH_PE_pcrel 0x10 35 #define DW_EH_PE_sdata4 0x0b 36 #define DW_OP_breg4 0x74 37 #define DW_OP_breg7 0x77 38 #define DW_OP_deref 0x06 39 40 // Offsets into struct ucontext_t of uc_mcontext.gregs[x]. 41 #define OFFSET_R8 40 42 #define OFFSET_R9 48 43 #define OFFSET_R10 56 44 #define OFFSET_R11 64 45 #define OFFSET_R12 72 46 #define OFFSET_R13 80 47 #define OFFSET_R14 88 48 #define OFFSET_R15 96 49 #define OFFSET_RDI 104 50 #define OFFSET_RSI 112 51 #define OFFSET_RBP 120 52 #define OFFSET_RSP 160 53 #define OFFSET_RBX 128 54 #define OFFSET_RDX 136 55 #define OFFSET_RAX 144 56 #define OFFSET_RCX 152 57 #define OFFSET_RIP 168 58 59 // Non-standard DWARF constants for the x86-64 registers. 60 #define DW_x86_64_RAX 0 61 #define DW_x86_64_RDX 1 62 #define DW_x86_64_RCX 2 63 #define DW_x86_64_RBX 3 64 #define DW_x86_64_RSI 4 65 #define DW_x86_64_RDI 5 66 #define DW_x86_64_RBP 6 67 #define DW_x86_64_RSP 7 68 #define DW_x86_64_R8 8 69 #define DW_x86_64_R9 9 70 #define DW_x86_64_R10 10 71 #define DW_x86_64_R11 11 72 #define DW_x86_64_R12 12 73 #define DW_x86_64_R13 13 74 #define DW_x86_64_R14 14 75 #define DW_x86_64_R15 15 76 #define DW_x86_64_RIP 16 77 78 #define cfi_signal_frame_start(f) \ 79 .section .eh_frame,"a",@progbits; \ 80 .L ## f ## _START_EH_FRAME: \ 81 .long 2f - 1f; /* CIE length. */ \ 82 1:.long 0; /* CIE ID. */ \ 83 .byte 1; /* Version. */ \ 84 .string "zRS"; /* Augmentation string. */ \ 85 .uleb128 1; /* Code alignment factor. */ \ 86 .sleb128 -8; /* Data alignment factor. */ \ 87 .uleb128 DW_x86_64_RIP; /* Return address register. */ \ 88 .uleb128 1; /* 1 byte of augmentation data. */ \ 89 .byte (DW_EH_PE_pcrel | DW_EH_PE_sdata4); /* FDE encoding. */ \ 90 .align 8; \ 91 2: \ 92 .long .L ## f ## _END_FDE - .L ## f ## _START_FDE; /* FDE length. */ \ 93 .L ## f ## _START_FDE: \ 94 .long .L ## f ## _START_FDE - .L ## f ## _START_EH_FRAME; /* CIE location. */ \ 95 .long (.L ## f ## _START - 1) - .; /* pcrel start address (see FDE encoding above). */ \ 96 .long .L ## f ## _END - (.L ## f ## _START - 1); /* Function this FDE applies to. */ \ 97 .uleb128 0; /* FDE augmentation length. */ \ 98 99 #define cfi_signal_frame_end(f) \ 100 .L ## f ## _END_FDE: \ 101 102 #define cfi_def_cfa(offset) \ 103 .byte DW_CFA_def_cfa_expression; \ 104 .uleb128 2f-1f; \ 105 1:.byte DW_OP_breg7; \ 106 .sleb128 offset; \ 107 .byte DW_OP_deref; \ 108 2: \ 109 110 #define cfi_offset(reg_number,offset) \ 111 .byte DW_CFA_expression; \ 112 .uleb128 reg_number; \ 113 .uleb128 2f-1f; \ 114 1:.byte DW_OP_breg7; \ 115 .sleb128 offset; \ 116 2: \ 117 118 ENTRY_PRIVATE(__restore_rt) 119 .L__restore_rt_START: 120 mov $__NR_rt_sigreturn, %rax 121 syscall 122 .L__restore_rt_END: 123 END(__restore_rt) 124 cfi_signal_frame_start(__restore_rt) 125 cfi_def_cfa(OFFSET_RSP) 126 cfi_offset(DW_x86_64_R8, OFFSET_R8) 127 cfi_offset(DW_x86_64_R9, OFFSET_R9) 128 cfi_offset(DW_x86_64_R10, OFFSET_R10) 129 cfi_offset(DW_x86_64_R11, OFFSET_R11) 130 cfi_offset(DW_x86_64_R12, OFFSET_R12) 131 cfi_offset(DW_x86_64_R13, OFFSET_R13) 132 cfi_offset(DW_x86_64_R14, OFFSET_R14) 133 cfi_offset(DW_x86_64_R15, OFFSET_R15) 134 cfi_offset(DW_x86_64_RDI, OFFSET_RDI) 135 cfi_offset(DW_x86_64_RSI, OFFSET_RSI) 136 cfi_offset(DW_x86_64_RBP, OFFSET_RBP) 137 cfi_offset(DW_x86_64_RSP, OFFSET_RSP) 138 cfi_offset(DW_x86_64_RBX, OFFSET_RBX) 139 cfi_offset(DW_x86_64_RDX, OFFSET_RDX) 140 cfi_offset(DW_x86_64_RAX, OFFSET_RAX) 141 cfi_offset(DW_x86_64_RCX, OFFSET_RCX) 142 cfi_offset(DW_x86_64_RIP, OFFSET_RIP) 143 cfi_signal_frame_end(__restore_rt) 144
