asm.S

   1 /*
   2  * Copyright (c) 2008 Mans Rullgard <mans@mansr.com>
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include "config.h"
  22
  23 #ifdef __ELF__
  24 #   define ELF
  25 #else
  26 #   define ELF @
  27 #endif
  28
  29 #if CONFIG_THUMB
  30 #   define A @
  31 #   define T
  32 #else
  33 #   define A
  34 #   define T @
  35 #endif
  36
  37 #if HAVE_AS_FUNC
  38 #   define FUNC
  39 #else
  40 #   define FUNC @
  41 #endif
  42
  43 #if   HAVE_NEON
  44         .arch           armv7-a
  45 #elif HAVE_ARMV6T2
  46         .arch           armv6t2
  47 #elif HAVE_ARMV6
  48         .arch           armv6
  49 #elif HAVE_ARMV5TE
  50         .arch           armv5te
  51 #endif
  52
  53 #if   HAVE_NEON
  54         .fpu            neon
  55 #elif HAVE_VFP
  56         .fpu            vfp
  57 #endif
  58
  59         .syntax unified
  60 T       .thumb
  61 ELF     .eabi_attribute 25, 1           @ Tag_ABI_align_preserved
  62 ELF     .section .note.GNU-stack,"",%progbits @ Mark stack as non-executable
  63
  64 .macro  function name, export=0, align=2
  65         .set            .Lpic_idx, 0
  66         .set            .Lpic_gp, 0
  67     .macro endfunc
  68       .if .Lpic_idx
  69         .align          2
  70         .altmacro
  71         put_pic         %(.Lpic_idx - 1)
  72         .noaltmacro
  73       .endif
  74 ELF     .size   \name, . - \name
  75 FUNC    .endfunc
  76         .purgem endfunc
  77     .endm
  78         .text
  79         .align          \align
  80     .if \export
  81         .global EXTERN_ASM\name
  82 ELF     .type   EXTERN_ASM\name, %function
  83 FUNC    .func   EXTERN_ASM\name
  84 EXTERN_ASM\name:
  85     .else
  86 ELF     .type   \name, %function
  87 FUNC    .func   \name
  88 \name:
  89     .endif
  90 .endm
  91
  92 .macro  const   name, align=2
  93     .macro endconst
  94 ELF     .size   \name, . - \name
  95         .purgem endconst
  96     .endm
  97         .section        .rodata
  98         .align          \align
  99 \name:
 100 .endm
 101
 102 #if !HAVE_ARMV6T2_EXTERNAL
 103 .macro  movw    rd, val
 104         mov     \rd, \val &  255
 105         orr     \rd, \val & ~255
 106 .endm
 107 #endif
 108
 109 .macro  mov32   rd, val
 110 #if HAVE_ARMV6T2_EXTERNAL
 111         movw            \rd, #(\val) & 0xffff
 112     .if (\val) >> 16
 113         movt            \rd, #(\val) >> 16
 114     .endif
 115 #else
 116         ldr             \rd, =\val
 117 #endif
 118 .endm
 119
 120 .macro  put_pic         num
 121         put_pic_\num
 122 .endm
 123
 124 .macro  do_def_pic      num, val, label
 125     .macro put_pic_\num
 126       .if \num
 127         .altmacro
 128         put_pic         %(\num - 1)
 129         .noaltmacro
 130       .endif
 131 \label: .word           \val
 132         .purgem         put_pic_\num
 133     .endm
 134 .endm
 135
 136 .macro  def_pic         val, label
 137         .altmacro
 138         do_def_pic      %.Lpic_idx, \val, \label
 139         .noaltmacro
 140         .set            .Lpic_idx, .Lpic_idx + 1
 141 .endm
 142
 143 .macro  ldpic           rd,  val, indir=0
 144         ldr             \rd, .Lpicoff\@
 145 .Lpic\@:
 146     .if \indir
 147 A       ldr             \rd, [pc, \rd]
 148 T       add             \rd, pc
 149 T       ldr             \rd, [\rd]
 150     .else
 151         add             \rd, pc
 152     .endif
 153         def_pic         \val - (.Lpic\@ + (8 >> CONFIG_THUMB)), .Lpicoff\@
 154 .endm
 155
 156 .macro  movrel rd, val
 157 #if CONFIG_PIC
 158         ldpic           \rd, \val
 159 #elif HAVE_ARMV6T2_EXTERNAL && !defined(__APPLE__)
 160         movw            \rd, #:lower16:\val
 161         movt            \rd, #:upper16:\val
 162 #else
 163         ldr             \rd, =\val
 164 #endif
 165 .endm
 166
 167 .macro  movrelx         rd,  val, gp
 168 #if CONFIG_PIC && defined(__ELF__)
 169     .ifnb \gp
 170       .if .Lpic_gp
 171         .unreq          gp
 172       .endif
 173         gp      .req    \gp
 174         ldpic           gp,  _GLOBAL_OFFSET_TABLE_
 175     .elseif !.Lpic_gp
 176         gp      .req    r12
 177         ldpic           gp,  _GLOBAL_OFFSET_TABLE_
 178     .endif
 179         .set            .Lpic_gp, 1
 180         ldr             \rd, .Lpicoff\@
 181         ldr             \rd, [gp, \rd]
 182         def_pic         \val(GOT), .Lpicoff\@
 183 #elif CONFIG_PIC && defined(__APPLE__)
 184         ldpic           \rd, .Lpic\@, indir=1
 185         .non_lazy_symbol_pointer
 186 .Lpic\@:
 187         .indirect_symbol \val
 188         .word           0
 189         .text
 190 #else
 191         movrel          \rd, \val
 192 #endif
 193 .endm
 194
 195 .macro  add_sh          rd,  rn,  rm,  sh:vararg
 196 A       add             \rd, \rn, \rm, \sh
 197 T       mov             \rm, \rm, \sh
 198 T       add             \rd, \rn, \rm
 199 .endm
 200
 201 .macro  ldr_pre         rt,  rn,  rm:vararg
 202 A       ldr             \rt, [\rn, \rm]!
 203 T       add             \rn, \rn, \rm
 204 T       ldr             \rt, [\rn]
 205 .endm
 206
 207 .macro  ldr_dpre        rt,  rn,  rm:vararg
 208 A       ldr             \rt, [\rn, -\rm]!
 209 T       sub             \rn, \rn, \rm
 210 T       ldr             \rt, [\rn]
 211 .endm
 212
 213 .macro  ldr_nreg        rt,  rn,  rm:vararg
 214 A       ldr             \rt, [\rn, -\rm]
 215 T       sub             \rt, \rn, \rm
 216 T       ldr             \rt, [\rt]
 217 .endm
 218
 219 .macro  ldr_post        rt,  rn,  rm:vararg
 220 A       ldr             \rt, [\rn], \rm
 221 T       ldr             \rt, [\rn]
 222 T       add             \rn, \rn, \rm
 223 .endm
 224
 225 .macro  ldrc_pre        cc,  rt,  rn,  rm:vararg
 226 A       ldr\cc          \rt, [\rn, \rm]!
 227 T       itt             \cc
 228 T       add\cc          \rn, \rn, \rm
 229 T       ldr\cc          \rt, [\rn]
 230 .endm
 231
 232 .macro  ldrd_reg        rt,  rt2, rn,  rm
 233 A       ldrd            \rt, \rt2, [\rn, \rm]
 234 T       add             \rt, \rn, \rm
 235 T       ldrd            \rt, \rt2, [\rt]
 236 .endm
 237
 238 .macro  ldrd_post       rt,  rt2, rn,  rm
 239 A       ldrd            \rt, \rt2, [\rn], \rm
 240 T       ldrd            \rt, \rt2, [\rn]
 241 T       add             \rn, \rn, \rm
 242 .endm
 243
 244 .macro  ldrh_pre        rt,  rn,  rm
 245 A       ldrh            \rt, [\rn, \rm]!
 246 T       add             \rn, \rn, \rm
 247 T       ldrh            \rt, [\rn]
 248 .endm
 249
 250 .macro  ldrh_dpre       rt,  rn,  rm
 251 A       ldrh            \rt, [\rn, -\rm]!
 252 T       sub             \rn, \rn, \rm
 253 T       ldrh            \rt, [\rn]
 254 .endm
 255
 256 .macro  ldrh_post       rt,  rn,  rm
 257 A       ldrh            \rt, [\rn], \rm
 258 T       ldrh            \rt, [\rn]
 259 T       add             \rn, \rn, \rm
 260 .endm
 261
 262 .macro  ldrb_post       rt,  rn,  rm
 263 A       ldrb            \rt, [\rn], \rm
 264 T       ldrb            \rt, [\rn]
 265 T       add             \rn, \rn, \rm
 266 .endm
 267
 268 .macro  str_post       rt,  rn,  rm:vararg
 269 A       str             \rt, [\rn], \rm
 270 T       str             \rt, [\rn]
 271 T       add             \rn, \rn, \rm
 272 .endm
 273
 274 .macro  strb_post       rt,  rn,  rm:vararg
 275 A       strb            \rt, [\rn], \rm
 276 T       strb            \rt, [\rn]
 277 T       add             \rn, \rn, \rm
 278 .endm
 279
 280 .macro  strd_post       rt,  rt2, rn,  rm
 281 A       strd            \rt, \rt2, [\rn], \rm
 282 T       strd            \rt, \rt2, [\rn]
 283 T       add             \rn, \rn, \rm
 284 .endm
 285
 286 .macro  strh_pre        rt,  rn,  rm
 287 A       strh            \rt, [\rn, \rm]!
 288 T       add             \rn, \rn, \rm
 289 T       strh            \rt, [\rn]
 290 .endm
 291
 292 .macro  strh_dpre       rt,  rn,  rm
 293 A       strh            \rt, [\rn, -\rm]!
 294 T       sub             \rn, \rn, \rm
 295 T       strh            \rt, [\rn]
 296 .endm
 297
 298 .macro  strh_post       rt,  rn,  rm
 299 A       strh            \rt, [\rn], \rm
 300 T       strh            \rt, [\rn]
 301 T       add             \rn, \rn, \rm
 302 .endm
 303
 304 .macro  strh_dpost       rt,  rn,  rm
 305 A       strh            \rt, [\rn], -\rm
 306 T       strh            \rt, [\rn]
 307 T       sub             \rn, \rn, \rm
 308 .endm
 309
 310 #if HAVE_VFP_ARGS
 311 ELF     .eabi_attribute 28, 1
 312 #   define VFP
 313 #   define NOVFP @
 314 #else
 315 #   define VFP   @
 316 #   define NOVFP
 317 #endif
 318
 319 #define GLUE(a, b) a ## b
 320 #define JOIN(a, b) GLUE(a, b)
 321 #define X(s) JOIN(EXTERN_ASM, s)