mirror of
https://github.com/google/pebble.git
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213 lines
4.8 KiB
C
213 lines
4.8 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_X86_H
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#define ASM_X86_H
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/*
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* mov syscall_no -> %eax
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* int $0x80
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* mov %eax -> ret
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*/
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#define SYSCALL_0 \
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push %edi; \
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push %esi; \
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push %ebx; \
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mov 0x10 (%esp), %eax; \
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int $0x80; \
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pop %ebx; \
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pop %esi; \
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pop %edi; \
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ret;
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/*
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* mov syscall_no -> %eax
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* mov arg1 -> %ebx
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* int $0x80
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* mov %eax -> ret
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*/
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#define SYSCALL_1 \
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push %edi; \
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push %esi; \
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push %ebx; \
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mov 0x10 (%esp), %eax; \
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mov 0x14 (%esp), %ebx; \
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int $0x80; \
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pop %ebx; \
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pop %esi; \
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pop %edi; \
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ret;
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/*
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* mov syscall_no -> %eax
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* mov arg1 -> %ebx
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* mov arg2 -> %ecx
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* int $0x80
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* mov %eax -> ret
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*/
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#define SYSCALL_2 \
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push %edi; \
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push %esi; \
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push %ebx; \
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mov 0x10 (%esp), %eax; \
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mov 0x14 (%esp), %ebx; \
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mov 0x18 (%esp), %ecx; \
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int $0x80; \
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pop %ebx; \
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pop %esi; \
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pop %edi; \
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ret;
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/*
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* mov syscall_no -> %eax
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* mov arg1 -> %ebx
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* mov arg2 -> %ecx
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* mov arg3 -> %edx
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* int $0x80
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* mov %eax -> ret
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*/
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#define SYSCALL_3 \
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push %edi; \
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push %esi; \
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push %ebx; \
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mov 0x10 (%esp), %eax; \
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mov 0x14 (%esp), %ebx; \
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mov 0x18 (%esp), %ecx; \
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mov 0x1c (%esp), %edx; \
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int $0x80; \
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pop %ebx; \
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pop %esi; \
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pop %edi; \
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ret;
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/*
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* push argv (%esp + 4)
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* push argc ([%esp + 0x4])
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*
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* call main
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*
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* push main_ret (%eax)
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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 %esp, %eax; \
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add $4, %eax; \
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push %eax; \
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mov 0x4 (%esp), %eax; \
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push %eax; \
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\
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call main; \
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\
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push %eax; \
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call exit; \
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\
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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_32 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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* - %ebx
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* - %esp
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* - %ebp
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* - %esi
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* - %edi
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* - x87 control word
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*
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* Also, we should store:
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* - return address (to jump to upon longjmp)
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*
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* mov return_address ([%esp]) -> %eax
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*
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* mov env ([%esp + 0x4]) -> %edx
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*
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* mov %ebx -> jmp_buf_0 ([%edx + 0x0])
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* mov %esp -> jmp_buf_4 ([%edx + 0x4])
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* mov %ebp -> jmp_buf_8 ([%edx + 0x8])
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* mov %esi -> jmp_buf_12 ([%edx + 0xc])
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* mov %edi -> jmp_buf_16 ([%edx + 0x10])
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* mov %eax -> jmp_buf_20 ([%edx + 0x14])
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* fnstcw -> jmp_buf_24 ([%edx + 0x18])
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*
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* ret
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*/
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#define _SETJMP \
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mov (%esp), %eax; \
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mov 0x4 (%esp), %edx; \
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\
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mov %ebx, 0x00 (%edx); \
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mov %esp, 0x04 (%edx); \
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mov %ebp, 0x08 (%edx); \
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mov %esi, 0x0c (%edx); \
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mov %edi, 0x10 (%edx); \
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mov %eax, 0x14 (%edx); \
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fnstcw 0x18 (%edx); \
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\
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xor %eax, %eax; \
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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 env ([%esp + 0x4]) -> %edx
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* mov val ([%esp + 0x8]) -> %eax
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*
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* mov jmp_buf_0 ([%edx + 0x0]) -> %ebx
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* mov jmp_buf_4 ([%edx + 0x8]) -> %esp
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* mov jmp_buf_8 ([%edx + 0x10]) -> %ebp
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* mov jmp_buf_12 ([%edx + 0x18]) -> %esi
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* mov jmp_buf_16 ([%edx + 0x20]) -> %edi
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* mov jmp_buf_20 ([%edx + 0x28]) -> %ecx
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* fldcw jmp_buf_24 ([%edx + 0x30])
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*
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* mov return_address (%ecx) -> ([%esp])
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*
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* cmp (%eax), 0x0
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* jnz 1f
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* xor %eax, %eax
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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 0x4 (%esp), %edx; \
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mov 0x8 (%esp), %eax; \
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\
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mov 0x0 (%edx), %ebx; \
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mov 0x4 (%edx), %esp; \
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mov 0x8 (%edx), %ebp; \
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mov 0xc (%edx), %esi; \
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mov 0x10 (%edx), %edi; \
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mov 0x14 (%edx), %ecx; \
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fldcw 0x18 (%edx); \
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\
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mov %ecx, (%esp); \
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\
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test %eax, %eax; \
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jnz 1f; \
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xor %eax, %eax; \
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1: \
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\
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ret
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#endif /* !ASM_X86_H */
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