93d74b65e1434ef9bf519654004f1ec4d00710fa
[libav.git] / libavutil / arm / asm.S
1 /*
2 * Copyright (c) 2008 Mans Rullgard <mans@mansr.com>
3 *
4 * This file is part of Libav.
5 *
6 * Libav 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 * Libav 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 Libav; 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)