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/*
* 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)
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