;*****************************************************************************;* 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 FENC_STRIDE 16%assign FDEC_STRIDE 32; This is needed for ELF, otherwise the GNU linker assumes the stack is; executable by default.%ifidn __OUTPUT_FORMAT__,elfSECTION .note.GNU-stack noalloc noexec nowrite progbits%endif