| /* |
| * Copyright (C) 2013 The Android Open Source Project |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #include <private/bionic_asm.h> |
| |
| // DWARF constants. |
| #define DW_CFA_def_cfa_expression 0x0f |
| #define DW_CFA_expression 0x10 |
| #define DW_EH_PE_pcrel 0x10 |
| #define DW_EH_PE_sdata4 0x0b |
| #define DW_OP_breg4 0x74 |
| #define DW_OP_breg7 0x77 |
| #define DW_OP_deref 0x06 |
| |
| // Offsets into struct ucontext_t of uc_mcontext.gregs[x]. |
| #define OFFSET_R8 40 |
| #define OFFSET_R9 48 |
| #define OFFSET_R10 56 |
| #define OFFSET_R11 64 |
| #define OFFSET_R12 72 |
| #define OFFSET_R13 80 |
| #define OFFSET_R14 88 |
| #define OFFSET_R15 96 |
| #define OFFSET_RDI 104 |
| #define OFFSET_RSI 112 |
| #define OFFSET_RBP 120 |
| #define OFFSET_RSP 160 |
| #define OFFSET_RBX 128 |
| #define OFFSET_RDX 136 |
| #define OFFSET_RAX 144 |
| #define OFFSET_RCX 152 |
| #define OFFSET_RIP 168 |
| |
| // Non-standard DWARF constants for the x86-64 registers. |
| #define DW_x86_64_RAX 0 |
| #define DW_x86_64_RDX 1 |
| #define DW_x86_64_RCX 2 |
| #define DW_x86_64_RBX 3 |
| #define DW_x86_64_RSI 4 |
| #define DW_x86_64_RDI 5 |
| #define DW_x86_64_RBP 6 |
| #define DW_x86_64_RSP 7 |
| #define DW_x86_64_R8 8 |
| #define DW_x86_64_R9 9 |
| #define DW_x86_64_R10 10 |
| #define DW_x86_64_R11 11 |
| #define DW_x86_64_R12 12 |
| #define DW_x86_64_R13 13 |
| #define DW_x86_64_R14 14 |
| #define DW_x86_64_R15 15 |
| #define DW_x86_64_RIP 16 |
| |
| #define cfi_signal_frame_start(f) \ |
| .section .eh_frame,"a",@progbits; \ |
| .L ## f ## _START_EH_FRAME: \ |
| .long 2f - 1f; /* CIE length. */ \ |
| 1:.long 0; /* CIE ID. */ \ |
| .byte 1; /* Version. */ \ |
| .string "zRS"; /* Augmentation string. */ \ |
| .uleb128 1; /* Code alignment factor. */ \ |
| .sleb128 -8; /* Data alignment factor. */ \ |
| .uleb128 DW_x86_64_RIP; /* Return address register. */ \ |
| .uleb128 1; /* 1 byte of augmentation data. */ \ |
| .byte (DW_EH_PE_pcrel | DW_EH_PE_sdata4); /* FDE encoding. */ \ |
| .align 8; \ |
| 2: \ |
| .long .L ## f ## _END_FDE - .L ## f ## _START_FDE; /* FDE length. */ \ |
| .L ## f ## _START_FDE: \ |
| .long .L ## f ## _START_FDE - .L ## f ## _START_EH_FRAME; /* CIE location. */ \ |
| .long (.L ## f ## _START - 1) - .; /* pcrel start address (see FDE encoding above). */ \ |
| .long .L ## f ## _END - (.L ## f ## _START - 1); /* Function this FDE applies to. */ \ |
| .uleb128 0; /* FDE augmentation length. */ \ |
| |
| #define cfi_signal_frame_end(f) \ |
| .L ## f ## _END_FDE: \ |
| |
| #define cfi_def_cfa(offset) \ |
| .byte DW_CFA_def_cfa_expression; \ |
| .uleb128 2f-1f; \ |
| 1:.byte DW_OP_breg7; \ |
| .sleb128 offset; \ |
| .byte DW_OP_deref; \ |
| 2: \ |
| |
| #define cfi_offset(reg_number,offset) \ |
| .byte DW_CFA_expression; \ |
| .uleb128 reg_number; \ |
| .uleb128 2f-1f; \ |
| 1:.byte DW_OP_breg7; \ |
| .sleb128 offset; \ |
| 2: \ |
| |
| ENTRY_PRIVATE(__restore_rt) |
| .L__restore_rt_START: |
| mov $__NR_rt_sigreturn, %rax |
| syscall |
| .L__restore_rt_END: |
| END(__restore_rt) |
| cfi_signal_frame_start(__restore_rt) |
| cfi_def_cfa(OFFSET_RSP) |
| cfi_offset(DW_x86_64_R8, OFFSET_R8) |
| cfi_offset(DW_x86_64_R9, OFFSET_R9) |
| cfi_offset(DW_x86_64_R10, OFFSET_R10) |
| cfi_offset(DW_x86_64_R11, OFFSET_R11) |
| cfi_offset(DW_x86_64_R12, OFFSET_R12) |
| cfi_offset(DW_x86_64_R13, OFFSET_R13) |
| cfi_offset(DW_x86_64_R14, OFFSET_R14) |
| cfi_offset(DW_x86_64_R15, OFFSET_R15) |
| cfi_offset(DW_x86_64_RDI, OFFSET_RDI) |
| cfi_offset(DW_x86_64_RSI, OFFSET_RSI) |
| cfi_offset(DW_x86_64_RBP, OFFSET_RBP) |
| cfi_offset(DW_x86_64_RSP, OFFSET_RSP) |
| cfi_offset(DW_x86_64_RBX, OFFSET_RBX) |
| cfi_offset(DW_x86_64_RDX, OFFSET_RDX) |
| cfi_offset(DW_x86_64_RAX, OFFSET_RAX) |
| cfi_offset(DW_x86_64_RCX, OFFSET_RCX) |
| cfi_offset(DW_x86_64_RIP, OFFSET_RIP) |
| cfi_signal_frame_end(__restore_rt) |