pebble/third_party/jerryscript/jerry-libc/arch/x86-64.h
2025-01-27 11:38:16 -08:00

188 lines
4 KiB
C

/* Copyright 2014-2015 Samsung Electronics Co., Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ASM_X64_H
#define ASM_X64_H
/*
* mov syscall_no (%rdi) -> %rax
* syscall
*/
#define SYSCALL_0 \
mov %rdi, %rax; \
syscall; \
ret;
/*
* mov syscall_no (%rdi) -> %rax
* mov arg1 (%rsi) -> %rdi
* syscall
*/
#define SYSCALL_1 \
mov %rdi, %rax; \
mov %rsi, %rdi; \
syscall; \
ret;
/*
* mov syscall_no (%rdi) -> %rax
* mov arg1 (%rsi) -> %rdi
* mov arg2 (%rdx) -> %rsi
* syscall
*/
#define SYSCALL_2 \
mov %rdi, %rax; \
mov %rsi, %rdi; \
mov %rdx, %rsi; \
syscall; \
ret;
/*
* mov syscall_no (%rdi) -> %rax
* mov arg1 (%rsi) -> %rdi
* mov arg2 (%rdx) -> %rsi
* mov arg3 (%rcx) -> %rdx
* syscall
*/
#define SYSCALL_3 \
mov %rdi, %rax; \
mov %rsi, %rdi; \
mov %rdx, %rsi; \
mov %rcx, %rdx; \
syscall; \
ret;
/*
* mov argc ([%rsp]) -> %rdi
* mov argv (%rsp + 0x8) -> %rsi
*
* call main
*
* mov main_ret (%rax) -> %rdi
* call exit
*
* infinite loop
*/
#define _START \
mov (%rsp), %rdi; \
mov %rsp, %rsi; \
add $8, %rsi; \
callq main; \
\
mov %rax, %rdi; \
callq exit; \
1: \
jmp 1b
/*
* setjmp
*
* According to x86_64 System V ABI, the following registers are
* callee-saved, and so need to be stored in context:
* - %rbp
* - %rbx
* - %r12
* - %r13
* - %r14
* - %r15
* - x87 control word
*
* Also, we should store:
* - %rsp (stack pointer)
* - return address (to jump to upon longjmp)
*
* mov return_address ([%rsp]) -> %rax
*
* mov %rsp -> jmp_buf_0 ([%rdi + 0x0])
* mov %rax -> jmp_buf_8 ([%rdi + 0x8])
* mov %rbp -> jmp_buf_16 ([%rdi + 0x10])
* mov %rbx -> jmp_buf_24 ([%rdi + 0x18])
* mov %r12 -> jmp_buf_32 ([%rdi + 0x20])
* mov %r13 -> jmp_buf_40 ([%rdi + 0x28])
* mov %r14 -> jmp_buf_48 ([%rdi + 0x30])
* mov %r15 -> jmp_buf_56 ([%rdi + 0x38])
* fnstcw -> jmp_buf_64 ([%rdi + 0x40])
*
* ret
*/
#define _SETJMP \
mov (%rsp), %rax; \
\
mov %rsp, 0x00(%rdi); \
mov %rax, 0x08(%rdi); \
mov %rbp, 0x10(%rdi); \
mov %rbx, 0x18(%rdi); \
mov %r12, 0x20(%rdi); \
mov %r13, 0x28(%rdi); \
mov %r14, 0x30(%rdi); \
mov %r15, 0x38(%rdi); \
fnstcw 0x40(%rdi); \
\
xor %rax, %rax; \
\
ret;
/*
* longjmp
*
* See also:
* _SETJMP
*
* mov jmp_buf_0 ([%rdi + 0x0]) -> %rsp
* mov jmp_buf_8 ([%rdi + 0x8]) -> %rax
* mov jmp_buf_16 ([%rdi + 0x10]) -> %rbp
* mov jmp_buf_24 ([%rdi + 0x18]) -> %rbx
* mov jmp_buf_32 ([%rdi + 0x20]) -> %r12
* mov jmp_buf_40 ([%rdi + 0x28]) -> %r13
* mov jmp_buf_48 ([%rdi + 0x30]) -> %r14
* mov jmp_buf_56 ([%rdi + 0x38]) -> %r15
* fldcw jmp_buf_64 ([%rdi + 0x40])
*
* mov return_address (%rax) -> ([%rsp])
*
* mov val (%rsi) -> %rax
*
* test (%rax), (%rax)
* jnz 1f
* mov $1, %rax
* 1:
*
* ret
*/
#define _LONGJMP \
mov 0x00(%rdi), %rsp; \
mov 0x08(%rdi), %rax; \
mov 0x10(%rdi), %rbp; \
mov 0x18(%rdi), %rbx; \
mov 0x20(%rdi), %r12; \
mov 0x28(%rdi), %r13; \
mov 0x30(%rdi), %r14; \
mov 0x38(%rdi), %r15; \
fldcw 0x40(%rdi); \
\
mov %rax, (%rsp); \
\
mov %rsi, %rax; \
\
test %rax, %rax; \
jnz 1f; \
mov $1, %rax; \
1: \
\
ret
#endif /* !ASM_X64_H */