1 ; 2 ; Copyright (c) 2010 The WebM project authors. All Rights Reserved. 3 ; 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. 9 ; 10 11 12 %include "vpx_config.asm" 13 14 ; 32/64 bit compatibility macros 15 ; 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. 18 ; 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 25 %else 26 %define ABI_IS_32BIT 0 27 %endif 28 29 %if ABI_IS_32BIT 30 %define rax eax 31 %define rbx ebx 32 %define rcx ecx 33 %define rdx edx 34 %define rsi esi 35 %define rdi edi 36 %define rsp esp 37 %define rbp ebp 38 %define movsxd mov 39 %macro movq 2 40 %ifidn %1,eax 41 movd %1,%2 42 %elifidn %2,eax 43 movd %1,%2 44 %elifidn %1,ebx 45 movd %1,%2 46 %elifidn %2,ebx 47 movd %1,%2 48 %elifidn %1,ecx 49 movd %1,%2 50 %elifidn %2,ecx 51 movd %1,%2 52 %elifidn %1,edx 53 movd %1,%2 54 %elifidn %2,edx 55 movd %1,%2 56 %elifidn %1,esi 57 movd %1,%2 58 %elifidn %2,esi 59 movd %1,%2 60 %elifidn %1,edi 61 movd %1,%2 62 %elifidn %2,edi 63 movd %1,%2 64 %elifidn %1,esp 65 movd %1,%2 66 %elifidn %2,esp 67 movd %1,%2 68 %elifidn %1,ebp 69 movd %1,%2 70 %elifidn %2,ebp 71 movd %1,%2 72 %else 73 movq %1,%2 74 %endif 75 %endmacro 76 %endif 77 78 79 ; sym() 80 ; Return the proper symbol name for the target ABI. 81 ; 82 ; Certain ABIs, notably MS COFF and Darwin MACH-O, require that symbols 83 ; with C linkage be prefixed with an underscore. 84 ; 85 %ifidn __OUTPUT_FORMAT__,elf32 86 %define sym(x) x 87 %elifidn __OUTPUT_FORMAT__,elf64 88 %define sym(x) x 89 %elifidn __OUTPUT_FORMAT__,x64 90 %define sym(x) x 91 %else 92 %define sym(x) _ %+ x 93 %endif 94 95 ; arg() 96 ; Return the address specification of the given argument 97 ; 98 %if ABI_IS_32BIT 99 %define arg(x) [ebp+8+4*x] 100 %else 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] 105 %else 106 %define arg(x) [rbp-8-8*x] 107 %endif 108 %endif 109 110 ; REG_SZ_BYTES, REG_SZ_BITS 111 ; Size of a register 112 %if ABI_IS_32BIT 113 %define REG_SZ_BYTES 4 114 %define REG_SZ_BITS 32 115 %else 116 %define REG_SZ_BYTES 8 117 %define REG_SZ_BITS 64 118 %endif 119 120 121 ; 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. 127 %macro ALIGN_STACK 2 128 mov %2, rsp 129 and rsp, -%1 130 lea rsp, [rsp - (%1 - REG_SZ_BYTES)] 131 push %2 132 %endmacro 133 134 135 ; 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. 140 ; 141 %idefine PTR 142 %idefine XMMWORD 143 %idefine MMWORD 144 145 ; PIC macros 146 ; 147 %if ABI_IS_32BIT 148 %if CONFIG_PIC=1 149 %ifidn __OUTPUT_FORMAT__,elf32 150 %define WRT_PLT wrt ..plt 151 %macro GET_GOT 1 152 extern _GLOBAL_OFFSET_TABLE_ 153 push %1 154 call %%get_got 155 %%sub_offset: 156 jmp %%exitGG 157 %%get_got: 158 mov %1, [esp] 159 add %1, _GLOBAL_OFFSET_TABLE_ + $$ - %%sub_offset wrt ..gotpc 160 ret 161 %%exitGG: 162 %undef GLOBAL 163 %define GLOBAL(x) x + %1 wrt ..gotoff 164 %undef RESTORE_GOT 165 %define RESTORE_GOT pop %1 166 %endmacro 167 %elifidn __OUTPUT_FORMAT__,macho32 168 %macro GET_GOT 1 169 push %1 170 call %%get_got 171 %%get_got: 172 pop %1 173 %undef GLOBAL 174 %define GLOBAL(x) x + %1 - %%get_got 175 %undef RESTORE_GOT 176 %define RESTORE_GOT pop %1 177 %endmacro 178 %endif 179 %endif 180 %define HIDDEN_DATA(x) x 181 %else 182 %macro GET_GOT 1 183 %endmacro 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 188 %else 189 %define HIDDEN_DATA(x) x 190 %endif 191 %endif 192 %ifnmacro GET_GOT 193 %macro GET_GOT 1 194 %endmacro 195 %define GLOBAL(x) x 196 %endif 197 %ifndef RESTORE_GOT 198 %define RESTORE_GOT 199 %endif 200 %ifndef WRT_PLT 201 %define WRT_PLT 202 %endif 203 204 %if ABI_IS_32BIT 205 %macro SHADOW_ARGS_TO_STACK 1 206 %endm 207 %define UNSHADOW_ARGS 208 %else 209 %ifidn __OUTPUT_FORMAT__,x64 210 %macro SHADOW_ARGS_TO_STACK 1 ; argc 211 %if %1 > 0 212 mov arg(0),rcx 213 %endif 214 %if %1 > 1 215 mov arg(1),rdx 216 %endif 217 %if %1 > 2 218 mov arg(2),r8 219 %endif 220 %if %1 > 3 221 mov arg(3),r9 222 %endif 223 %endm 224 %else 225 %macro SHADOW_ARGS_TO_STACK 1 ; argc 226 %if %1 > 0 227 push rdi 228 %endif 229 %if %1 > 1 230 push rsi 231 %endif 232 %if %1 > 2 233 push rdx 234 %endif 235 %if %1 > 3 236 push rcx 237 %endif 238 %if %1 > 4 239 push r8 240 %endif 241 %if %1 > 5 242 push r9 243 %endif 244 %if %1 > 6 245 %assign i %1-6 246 %assign off 16 247 %rep i 248 mov rax,[rbp+off] 249 push rax 250 %assign off off+8 251 %endrep 252 %endif 253 %endm 254 %endif 255 %define UNSHADOW_ARGS mov rsp, rbp 256 %endif 257 258 ; must keep XMM6:XMM15 (libvpx uses XMM6 and XMM7) on Win64 ABI 259 ; rsp register has to be aligned 260 %ifidn __OUTPUT_FORMAT__,x64 261 %macro SAVE_XMM 0 262 sub rsp, 32 263 movdqa XMMWORD PTR [rsp], xmm6 264 movdqa XMMWORD PTR [rsp+16], xmm7 265 %endmacro 266 %macro RESTORE_XMM 0 267 movdqa xmm6, XMMWORD PTR [rsp] 268 movdqa xmm7, XMMWORD PTR [rsp+16] 269 add rsp, 32 270 %endmacro 271 %else 272 %macro SAVE_XMM 0 273 %endmacro 274 %macro RESTORE_XMM 0 275 %endmacro 276 %endif 277 278 ; Name of the rodata section 279 ; 280 ; .rodata seems to be an elf-ism, as it doesn't work on OSX. 281 ; 282 %ifidn __OUTPUT_FORMAT__,macho64 283 %define SECTION_RODATA section .text 284 %elifidn __OUTPUT_FORMAT__,macho32 285 %macro SECTION_RODATA 0 286 section .text 287 %endmacro 288 %else 289 %define SECTION_RODATA section .rodata 290 %endif 291 292 293 ; 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 296 section .text 297 %elifidn __OUTPUT_FORMAT__,elf64 298 section .note.GNU-stack noalloc noexec nowrite progbits 299 section .text 300 %endif 301 302
