Elliott Hughes | 4906e56 | 2013-10-04 14:55:30 -0700 | [diff] [blame] | 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 | |
Elliott Hughes | 851e68a | 2014-02-19 16:53:20 -0800 | [diff] [blame] | 29 | #include <private/bionic_asm.h> |
Elliott Hughes | 4906e56 | 2013-10-04 14:55:30 -0700 | [diff] [blame] | 30 | |
Pavel Chupin | 8eb8c39 | 2014-09-26 16:02:09 +0400 | [diff] [blame^] | 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: |
Elliott Hughes | 7dc2b7b | 2014-09-10 15:20:40 -0700 | [diff] [blame] | 120 | mov $__NR_rt_sigreturn, %rax |
Elliott Hughes | 4906e56 | 2013-10-04 14:55:30 -0700 | [diff] [blame] | 121 | syscall |
Pavel Chupin | 8eb8c39 | 2014-09-26 16:02:09 +0400 | [diff] [blame^] | 122 | .L__restore_rt_END: |
Elliott Hughes | 7dc2b7b | 2014-09-10 15:20:40 -0700 | [diff] [blame] | 123 | END(__restore_rt) |
Pavel Chupin | 8eb8c39 | 2014-09-26 16:02:09 +0400 | [diff] [blame^] | 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) |