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