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/*
* Copyright (C) 2014 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>
#include <private/bionic_asm_dwarf_exprs.h>
// Offsets into struct sigcontext.
#define OFFSET_EDI 16
#define OFFSET_ESI 20
#define OFFSET_EBP 24
#define OFFSET_ESP 28
#define OFFSET_EBX 32
#define OFFSET_EDX 36
#define OFFSET_ECX 40
#define OFFSET_EAX 44
#define OFFSET_EIP 56
// Non-standard DWARF constants for the x86 registers.
#define DW_x86_REG_EAX 0
#define DW_x86_REG_ECX 1
#define DW_x86_REG_EDX 2
#define DW_x86_REG_EBX 3
#define DW_x86_REG_ESP 4
#define DW_x86_REG_EBP 5
#define DW_x86_REG_ESI 6
#define DW_x86_REG_EDI 7
#define DW_x86_REG_EIP 8
#define RESTORE_GPR(reg, extra_offset) \
m_cfi_breg_offset DW_x86_REG_ ## reg, \
DW_x86_REG_ESP, \
(OFFSET_ ## reg + (extra_offset));
// Restoring ESP is unnecessary as the unwinder simply uses the CFA value.
#define RESTORE_GPRS(extra_offset) \
m_cfi_def_cfa_deref DW_x86_REG_ESP, (OFFSET_ESP + (extra_offset)); \
RESTORE_GPR(EDI, extra_offset) \
RESTORE_GPR(ESI, extra_offset) \
RESTORE_GPR(EBP, extra_offset) \
RESTORE_GPR(EBX, extra_offset) \
RESTORE_GPR(EDX, extra_offset) \
RESTORE_GPR(ECX, extra_offset) \
RESTORE_GPR(EAX, extra_offset) \
RESTORE_GPR(EIP, extra_offset) \
.text
.cfi_startproc
.cfi_signal_frame
RESTORE_GPRS(4)
nop // See comment in libc/arch-x86_64/bionic/__restore_rt.S about this nop.
ENTRY_PRIVATE_NO_DWARF(__restore)
popl %eax
RESTORE_GPRS(0)
movl $__NR_sigreturn, %eax
int $0x80
END(__restore)
.cfi_startproc
.cfi_signal_frame
RESTORE_GPRS(160)
nop // See comment in libc/arch-x86_64/bionic/__restore_rt.S about this nop.
ENTRY_PRIVATE_NO_DWARF(__restore_rt)
movl $__NR_rt_sigreturn, %eax
int $0x80
END(__restore_rt)
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