2 ; Copyright (c) 2010 The WebM project authors. All Rights Reserved.
4 ; Use of this source code is governed by a BSD-style license
5 ; that can be found in the LICENSE file in the root of the source
6 ; tree. An additional intellectual property rights grant can be found
7 ; in the file PATENTS. All contributing project authors may
8 ; be found in the AUTHORS file in the root of the source tree.
12 %include "vpx_config.asm"
14 ; 32/64 bit compatibility macros
16 ; In general, we make the source use 64 bit syntax, then twiddle with it using
17 ; the preprocessor to get the 32 bit syntax on 32 bit platforms.
19 %ifidn __OUTPUT_FORMAT__,elf32
20 %define ABI_IS_32BIT 1
21 %elifidn __OUTPUT_FORMAT__,macho32
22 %define ABI_IS_32BIT 1
23 %elifidn __OUTPUT_FORMAT__,win32
24 %define ABI_IS_32BIT 1
26 %define ABI_IS_32BIT 0
80 ; Return the proper symbol name for the target ABI.
82 ; Certain ABIs, notably MS COFF and Darwin MACH-O, require that symbols
83 ; with C linkage be prefixed with an underscore.
85 %ifidn __OUTPUT_FORMAT__,elf32
87 %elifidn __OUTPUT_FORMAT__,elf64
89 %elifidn __OUTPUT_FORMAT__,x64
96 ; Return the address specification of the given argument
99 %define arg(x) [ebp+8+4*x]
101 ; 64 bit ABI passes arguments in registers. This is a workaround to get up
102 ; and running quickly. Relies on SHADOW_ARGS_TO_STACK
103 %ifidn __OUTPUT_FORMAT__,x64
104 %define arg(x) [rbp+16+8*x]
106 %define arg(x) [rbp-8-8*x]
110 ; REG_SZ_BYTES, REG_SZ_BITS
113 %define REG_SZ_BYTES 4
114 %define REG_SZ_BITS 32
116 %define REG_SZ_BYTES 8
117 %define REG_SZ_BITS 64
121 ; ALIGN_STACK <alignment> <register>
122 ; This macro aligns the stack to the given alignment (in bytes). The stack
123 ; is left such that the previous value of the stack pointer is the first
124 ; argument on the stack (ie, the inverse of this macro is 'pop rsp.')
125 ; This macro uses one temporary register, which is not preserved, and thus
126 ; must be specified as an argument.
130 lea rsp, [rsp - (%1 - REG_SZ_BYTES)]
136 ; The Microsoft assembler tries to impose a certain amount of type safety in
137 ; its register usage. YASM doesn't recognize these directives, so we just
138 ; %define them away to maintain as much compatibility as possible with the
139 ; original inline assembler we're porting from.
149 %ifidn __OUTPUT_FORMAT__,elf32
150 %define WRT_PLT wrt ..plt
152 extern _GLOBAL_OFFSET_TABLE_
159 add %1, _GLOBAL_OFFSET_TABLE_ + $$ - %%sub_offset wrt ..gotpc
163 %define GLOBAL(x) x + %1 wrt ..gotoff
165 %define RESTORE_GOT pop %1
167 %elifidn __OUTPUT_FORMAT__,macho32
174 %define GLOBAL(x) x + %1 - %%get_got
176 %define RESTORE_GOT pop %1
180 %define HIDDEN_DATA(x) x
184 %define GLOBAL(x) rel x
185 %ifidn __OUTPUT_FORMAT__,elf64
186 %define WRT_PLT wrt ..plt
187 %define HIDDEN_DATA(x) x:data hidden
189 %define HIDDEN_DATA(x) x
205 %macro SHADOW_ARGS_TO_STACK 1
207 %define UNSHADOW_ARGS
209 %ifidn __OUTPUT_FORMAT__,x64
210 %macro SHADOW_ARGS_TO_STACK 1 ; argc
225 %macro SHADOW_ARGS_TO_STACK 1 ; argc
255 %define UNSHADOW_ARGS mov rsp, rbp
258 ; must keep XMM6:XMM15 (libvpx uses XMM6 and XMM7) on Win64 ABI
259 ; rsp register has to be aligned
260 %ifidn __OUTPUT_FORMAT__,x64
263 movdqa XMMWORD PTR [rsp], xmm6
264 movdqa XMMWORD PTR [rsp+16], xmm7
267 movdqa xmm6, XMMWORD PTR [rsp]
268 movdqa xmm7, XMMWORD PTR [rsp+16]
278 ; Name of the rodata section
280 ; .rodata seems to be an elf-ism, as it doesn't work on OSX.
282 %ifidn __OUTPUT_FORMAT__,macho64
283 %define SECTION_RODATA section .text
284 %elifidn __OUTPUT_FORMAT__,macho32
285 %macro SECTION_RODATA 0
289 %define SECTION_RODATA section .rodata
293 ; Tell GNU ld that we don't require an executable stack.
294 %ifidn __OUTPUT_FORMAT__,elf32
295 section .note.GNU-stack noalloc noexec nowrite progbits
297 %elifidn __OUTPUT_FORMAT__,elf64
298 section .note.GNU-stack noalloc noexec nowrite progbits