Tilmann Scheller
0511091e8a
Since the project is now hosted at the JS Foundation we can move to unified copyright notices for the project. Starting with this commit all future contributions to the project should only carry the following copyright notice (except for third-party code which requires copyright information to be preserved): "Copyright JS Foundation and other contributors, http://js.foundation" (without the quotes) This avoids cluttering the codebase with contributor-specific copyright notices which have a higher maintenance overhead and tend to get outdated quickly. Also dropping the year from the copyright notices helps to avoid yearly code changes just to update the copyright notices. Note that each contributor still retains full copyright ownership of his/her contributions and the respective authorship is tracked very accurately via Git. JerryScript-DCO-1.0-Signed-off-by: Tilmann Scheller t.scheller@samsung.com
214 lines
4.8 KiB
C
214 lines
4.8 KiB
C
/* Copyright JS Foundation and other contributors, http://js.foundation
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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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