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 %elifidn __OUTPUT_FORMAT__,aout 26 %define ABI_IS_32BIT 1 27 %else 28 %define ABI_IS_32BIT 0 29 %endif 30 31 %if ABI_IS_32BIT 32 %define rax eax 33 %define rbx ebx 34 %define rcx ecx 35 %define rdx edx 36 %define rsi esi 37 %define rdi edi 38 %define rsp esp 39 %define rbp ebp 40 %define movsxd mov 41 %macro movq 2 42 %ifidn %1,eax 43 movd %1,%2 44 %elifidn %2,eax 45 movd %1,%2 46 %elifidn %1,ebx 47 movd %1,%2 48 %elifidn %2,ebx 49 movd %1,%2 50 %elifidn %1,ecx 51 movd %1,%2 52 %elifidn %2,ecx 53 movd %1,%2 54 %elifidn %1,edx 55 movd %1,%2 56 %elifidn %2,edx 57 movd %1,%2 58 %elifidn %1,esi 59 movd %1,%2 60 %elifidn %2,esi 61 movd %1,%2 62 %elifidn %1,edi 63 movd %1,%2 64 %elifidn %2,edi 65 movd %1,%2 66 %elifidn %1,esp 67 movd %1,%2 68 %elifidn %2,esp 69 movd %1,%2 70 %elifidn %1,ebp 71 movd %1,%2 72 %elifidn %2,ebp 73 movd %1,%2 74 %else 75 movq %1,%2 76 %endif 77 %endmacro 78 %endif 79 80 81 ; LIBVPX_YASM_WIN64 82 ; Set LIBVPX_YASM_WIN64 if output is Windows 64bit so the code will work if x64 83 ; or win64 is defined on the Yasm command line. 84 %ifidn __OUTPUT_FORMAT__,win64 85 %define LIBVPX_YASM_WIN64 1 86 %elifidn __OUTPUT_FORMAT__,x64 87 %define LIBVPX_YASM_WIN64 1 88 %else 89 %define LIBVPX_YASM_WIN64 0 90 %endif 91 92 ; sym() 93 ; Return the proper symbol name for the target ABI. 94 ; 95 ; Certain ABIs, notably MS COFF and Darwin MACH-O, require that symbols 96 ; with C linkage be prefixed with an underscore. 97 ; 98 %ifidn __OUTPUT_FORMAT__,elf32 99 %define sym(x) x 100 %elifidn __OUTPUT_FORMAT__,elf64 101 %define sym(x) x 102 %elifidn __OUTPUT_FORMAT__,elfx32 103 %define sym(x) x 104 %elif LIBVPX_YASM_WIN64 105 %define sym(x) x 106 %else 107 %define sym(x) _ %+ x 108 %endif 109 110 ; PRIVATE 111 ; Macro for the attribute to hide a global symbol for the target ABI. 112 ; This is only active if CHROMIUM is defined. 113 ; 114 ; Chromium doesn't like exported global symbols due to symbol clashing with 115 ; plugins among other things. 116 ; 117 ; Requires Chromium's patched copy of yasm: 118 ; http://src.chromium.org/viewvc/chrome?view=rev&revision=73761 119 ; http://www.tortall.net/projects/yasm/ticket/236 120 ; 121 %ifdef CHROMIUM 122 %ifidn __OUTPUT_FORMAT__,elf32 123 %define PRIVATE :hidden 124 %elifidn __OUTPUT_FORMAT__,elf64 125 %define PRIVATE :hidden 126 %elifidn __OUTPUT_FORMAT__,elfx32 127 %define PRIVATE :hidden 128 %elif LIBVPX_YASM_WIN64 129 %define PRIVATE 130 %else 131 %define PRIVATE :private_extern 132 %endif 133 %else 134 %define PRIVATE 135 %endif 136 137 ; arg() 138 ; Return the address specification of the given argument 139 ; 140 %if ABI_IS_32BIT 141 %define arg(x) [ebp+8+4*x] 142 %else 143 ; 64 bit ABI passes arguments in registers. This is a workaround to get up 144 ; and running quickly. Relies on SHADOW_ARGS_TO_STACK 145 %if LIBVPX_YASM_WIN64 146 %define arg(x) [rbp+16+8*x] 147 %else 148 %define arg(x) [rbp-8-8*x] 149 %endif 150 %endif 151 152 ; REG_SZ_BYTES, REG_SZ_BITS 153 ; Size of a register 154 %if ABI_IS_32BIT 155 %define REG_SZ_BYTES 4 156 %define REG_SZ_BITS 32 157 %else 158 %define REG_SZ_BYTES 8 159 %define REG_SZ_BITS 64 160 %endif 161 162 163 ; ALIGN_STACK <alignment> <register> 164 ; This macro aligns the stack to the given alignment (in bytes). The stack 165 ; is left such that the previous value of the stack pointer is the first 166 ; argument on the stack (ie, the inverse of this macro is 'pop rsp.') 167 ; This macro uses one temporary register, which is not preserved, and thus 168 ; must be specified as an argument. 169 %macro ALIGN_STACK 2 170 mov %2, rsp 171 and rsp, -%1 172 lea rsp, [rsp - (%1 - REG_SZ_BYTES)] 173 push %2 174 %endmacro 175 176 177 ; 178 ; The Microsoft assembler tries to impose a certain amount of type safety in 179 ; its register usage. YASM doesn't recognize these directives, so we just 180 ; %define them away to maintain as much compatibility as possible with the 181 ; original inline assembler we're porting from. 182 ; 183 %idefine PTR 184 %idefine XMMWORD 185 %idefine MMWORD 186 187 ; PIC macros 188 ; 189 %if ABI_IS_32BIT 190 %if CONFIG_PIC=1 191 %ifidn __OUTPUT_FORMAT__,elf32 192 %define WRT_PLT wrt ..plt 193 %macro GET_GOT 1 194 extern _GLOBAL_OFFSET_TABLE_ 195 push %1 196 call %%get_got 197 %%sub_offset: 198 jmp %%exitGG 199 %%get_got: 200 mov %1, [esp] 201 add %1, _GLOBAL_OFFSET_TABLE_ + $$ - %%sub_offset wrt ..gotpc 202 ret 203 %%exitGG: 204 %undef GLOBAL 205 %define GLOBAL(x) x + %1 wrt ..gotoff 206 %undef RESTORE_GOT 207 %define RESTORE_GOT pop %1 208 %endmacro 209 %elifidn __OUTPUT_FORMAT__,macho32 210 %macro GET_GOT 1 211 push %1 212 call %%get_got 213 %%get_got: 214 pop %1 215 %undef GLOBAL 216 %define GLOBAL(x) x + %1 - %%get_got 217 %undef RESTORE_GOT 218 %define RESTORE_GOT pop %1 219 %endmacro 220 %endif 221 %endif 222 223 %ifdef CHROMIUM 224 %ifidn __OUTPUT_FORMAT__,macho32 225 %define HIDDEN_DATA(x) x:private_extern 226 %else 227 %define HIDDEN_DATA(x) x 228 %endif 229 %else 230 %define HIDDEN_DATA(x) x 231 %endif 232 %else 233 %macro GET_GOT 1 234 %endmacro 235 %define GLOBAL(x) rel x 236 %ifidn __OUTPUT_FORMAT__,elf64 237 %define WRT_PLT wrt ..plt 238 %define HIDDEN_DATA(x) x:data hidden 239 %elifidn __OUTPUT_FORMAT__,elfx32 240 %define WRT_PLT wrt ..plt 241 %define HIDDEN_DATA(x) x:data hidden 242 %elifidn __OUTPUT_FORMAT__,macho64 243 %ifdef CHROMIUM 244 %define HIDDEN_DATA(x) x:private_extern 245 %else 246 %define HIDDEN_DATA(x) x 247 %endif 248 %else 249 %define HIDDEN_DATA(x) x 250 %endif 251 %endif 252 %ifnmacro GET_GOT 253 %macro GET_GOT 1 254 %endmacro 255 %define GLOBAL(x) x 256 %endif 257 %ifndef RESTORE_GOT 258 %define RESTORE_GOT 259 %endif 260 %ifndef WRT_PLT 261 %define WRT_PLT 262 %endif 263 264 %if ABI_IS_32BIT 265 %macro SHADOW_ARGS_TO_STACK 1 266 %endm 267 %define UNSHADOW_ARGS 268 %else 269 %if LIBVPX_YASM_WIN64 270 %macro SHADOW_ARGS_TO_STACK 1 ; argc 271 %if %1 > 0 272 mov arg(0),rcx 273 %endif 274 %if %1 > 1 275 mov arg(1),rdx 276 %endif 277 %if %1 > 2 278 mov arg(2),r8 279 %endif 280 %if %1 > 3 281 mov arg(3),r9 282 %endif 283 %endm 284 %else 285 %macro SHADOW_ARGS_TO_STACK 1 ; argc 286 %if %1 > 0 287 push rdi 288 %endif 289 %if %1 > 1 290 push rsi 291 %endif 292 %if %1 > 2 293 push rdx 294 %endif 295 %if %1 > 3 296 push rcx 297 %endif 298 %if %1 > 4 299 push r8 300 %endif 301 %if %1 > 5 302 push r9 303 %endif 304 %if %1 > 6 305 %assign i %1-6 306 %assign off 16 307 %rep i 308 mov rax,[rbp+off] 309 push rax 310 %assign off off+8 311 %endrep 312 %endif 313 %endm 314 %endif 315 %define UNSHADOW_ARGS mov rsp, rbp 316 %endif 317 318 ; Win64 ABI requires that XMM6:XMM15 are callee saved 319 ; SAVE_XMM n, [u] 320 ; store registers 6-n on the stack 321 ; if u is specified, use unaligned movs. 322 ; Win64 ABI requires 16 byte stack alignment, but then pushes an 8 byte return 323 ; value. Typically we follow this up with 'push rbp' - re-aligning the stack - 324 ; but in some cases this is not done and unaligned movs must be used. 325 %if LIBVPX_YASM_WIN64 326 %macro SAVE_XMM 1-2 a 327 %if %1 < 6 328 %error Only xmm registers 6-15 must be preserved 329 %else 330 %assign last_xmm %1 331 %define movxmm movdq %+ %2 332 %assign xmm_stack_space ((last_xmm - 5) * 16) 333 sub rsp, xmm_stack_space 334 %assign i 6 335 %rep (last_xmm - 5) 336 movxmm [rsp + ((i - 6) * 16)], xmm %+ i 337 %assign i i+1 338 %endrep 339 %endif 340 %endmacro 341 %macro RESTORE_XMM 0 342 %ifndef last_xmm 343 %error RESTORE_XMM must be paired with SAVE_XMM n 344 %else 345 %assign i last_xmm 346 %rep (last_xmm - 5) 347 movxmm xmm %+ i, [rsp +((i - 6) * 16)] 348 %assign i i-1 349 %endrep 350 add rsp, xmm_stack_space 351 ; there are a couple functions which return from multiple places. 352 ; otherwise, we could uncomment these: 353 ; %undef last_xmm 354 ; %undef xmm_stack_space 355 ; %undef movxmm 356 %endif 357 %endmacro 358 %else 359 %macro SAVE_XMM 1-2 360 %endmacro 361 %macro RESTORE_XMM 0 362 %endmacro 363 %endif 364 365 ; Name of the rodata section 366 ; 367 ; .rodata seems to be an elf-ism, as it doesn't work on OSX. 368 ; 369 %ifidn __OUTPUT_FORMAT__,macho64 370 %define SECTION_RODATA section .text 371 %elifidn __OUTPUT_FORMAT__,macho32 372 %macro SECTION_RODATA 0 373 section .text 374 %endmacro 375 %elifidn __OUTPUT_FORMAT__,aout 376 %define SECTION_RODATA section .data 377 %else 378 %define SECTION_RODATA section .rodata 379 %endif 380 381 382 ; Tell GNU ld that we don't require an executable stack. 383 %ifidn __OUTPUT_FORMAT__,elf32 384 section .note.GNU-stack noalloc noexec nowrite progbits 385 section .text 386 %elifidn __OUTPUT_FORMAT__,elf64 387 section .note.GNU-stack noalloc noexec nowrite progbits 388 section .text 389 %elifidn __OUTPUT_FORMAT__,elfx32 390 section .note.GNU-stack noalloc noexec nowrite progbits 391 section .text 392 %endif 393 394 ; On Android platforms use lrand48 when building postproc routines. Prior to L 395 ; rand() was not available. 396 %if CONFIG_POSTPROC=1 || CONFIG_VP9_POSTPROC=1 397 %ifdef __ANDROID__ 398 extern sym(lrand48) 399 %define LIBVPX_RAND lrand48 400 %else 401 extern sym(rand) 402 %define LIBVPX_RAND rand 403 %endif 404 %endif ; CONFIG_POSTPROC || CONFIG_VP9_POSTPROC 405
