i386inc.asm
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上传日期:2021-12-09
资源大小:5084k
文件大小:5k
源码类别:
Audio
开发平台:
Visual C++
- ;*****************************************************************************
- ;* i386inc.asm: h264 encoder library
- ;*****************************************************************************
- ;* Copyright (C) 2006 x264 project
- ;*
- ;* Author: Sam Hocevar <sam@zoy.org>
- ;*
- ;* This program is free software; you can redistribute it and/or modify
- ;* it under the terms of the GNU General Public License as published by
- ;* the Free Software Foundation; either version 2 of the License, or
- ;* (at your option) any later version.
- ;*
- ;* This program is distributed in the hope that it will be useful,
- ;* but WITHOUT ANY WARRANTY; without even the implied warranty of
- ;* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- ;* GNU General Public License for more details.
- ;*
- ;* You should have received a copy of the GNU General Public License
- ;* along with this program; if not, write to the Free Software
- ;* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
- ;*****************************************************************************
- BITS 32
- ;=============================================================================
- ; Macros and other preprocessor constants
- ;=============================================================================
- ; Symbol prefix for C linkage
- %macro cglobal 1
- %ifdef PREFIX
- global _%1
- %define %1 _%1
- %else
- global %1
- %endif
- %endmacro
- ; Name of the .rodata section. On OS X we cannot use .rodata because NASM
- ; is unable to compute address offsets outside of .text so we use the .text
- ; section instead until NASM is fixed.
- %macro SECTION_RODATA 0
- %ifidn __OUTPUT_FORMAT__,macho
- SECTION .text
- fakegot:
- %else
- SECTION .rodata data align=16
- %endif
- %endmacro
- ; PIC support macros. All these macros are totally harmless when __PIC__ is
- ; not defined but can ruin everything if misused in PIC mode. On x86, shared
- ; objects cannot directly access global variables by address, they need to
- ; go through the GOT (global offset table). Most OSes do not care about it
- ; and let you load non-shared .so objects (Linux, Win32...). However, OS X
- ; requires PIC code in its .dylib objects.
- ;
- ; - GOT_* should be used as a suffix for global addressing, eg.
- ; picgetgot ebx
- ; mov eax, [foo GOT_ebx]
- ; instead of
- ; mov eax, [foo]
- ;
- ; - picgetgot computes the GOT address into the given register in PIC
- ; mode, otherwise does nothing. You need to do this before using GOT_*.
- ;
- ; - picpush and picpop respectively push and pop the given register
- ; in PIC mode, otherwise do nothing. You should always use them around
- ; picgetgot except when sure that the register is no longer used and is
- ; being restored later by other means.
- ;
- ; - picesp is defined to compensate the changing of esp when pushing
- ; a register into the stack, eg.
- ; mov eax, [esp + 8]
- ; pushpic ebx
- ; mov eax, [picesp + 12]
- ; instead of
- ; mov eax, [esp + 8]
- ; pushpic ebx
- ; mov eax, [esp + 12]
- ;
- %ifdef __PIC__
- %ifidn __OUTPUT_FORMAT__,macho
- ; There is no real global offset table on OS X, but we still
- ; need to reference our variables by offset.
- %define GOT_eax - fakegot + eax
- %define GOT_ebx - fakegot + ebx
- %define GOT_ecx - fakegot + ecx
- %define GOT_edx - fakegot + edx
- %macro picgetgot 1
- call %%getgot
- %%getgot:
- pop %1
- add %1, $$ - %%getgot
- %endmacro
- %else
- %ifidn __OUTPUT_FORMAT__,elf
- %define GOT _GLOBAL_OFFSET_TABLE_
- %else ; for a.out
- %define GOT __GLOBAL_OFFSET_TABLE_
- %endif
- extern GOT
- %define GOT_eax + eax wrt ..gotoff
- %define GOT_ebx + ebx wrt ..gotoff
- %define GOT_ecx + ecx wrt ..gotoff
- %define GOT_edx + edx wrt ..gotoff
- %macro picgetgot 1
- call %%getgot
- %%getgot:
- pop %1
- add %1, GOT + $$ - %%getgot wrt ..gotpc
- %endmacro
- %endif
- %macro picpush 1
- push %1
- %endmacro
- %macro picpop 1
- pop %1
- %endmacro
- %define picesp esp+4
- %else
- %define GOT_eax
- %define GOT_ebx
- %define GOT_ecx
- %define GOT_edx
- %macro picgetgot 1
- %endmacro
- %macro picpush 1
- %endmacro
- %macro picpop 1
- %endmacro
- %define picesp esp
- %endif
- %assign FDEC_STRIDE 32
- ; This is needed for ELF, otherwise the GNU linker assumes the stack is
- ; executable by default.
- %ifidn __OUTPUT_FORMAT__,elf
- SECTION .note.GNU-stack noalloc noexec nowrite progbits
- %endif