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