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