path: root/libavutil/arm/asm.S (plain)
blob: 9cdcce9a180242d1d77beb1e9814d4a56694ba47

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_NEON
38	.arch armv7-a
39	#elif HAVE_ARMV6T2
40	.arch armv6t2
41	#elif HAVE_ARMV6
42	.arch armv6
43	#elif HAVE_ARMV5TE
44	.arch armv5te
45	#endif
46
47	#if HAVE_NEON
48	.fpu neon
49	#elif HAVE_VFP
50	.fpu vfp
51	#endif
52
53	.syntax unified
54	T .thumb
55	ELF .eabi_attribute 25, 1 @ Tag_ABI_align_preserved
56
57	.macro function name, export=0
58	.set .Lpic_idx, 0
59	.set .Lpic_gp, 0
60	.macro endfunc
61	.if .Lpic_idx
62	.align 2
63	.altmacro
64	put_pic %(.Lpic_idx - 1)
65	.noaltmacro
66	.endif
67	ELF .size \name, . - \name
68	.endfunc
69	.purgem endfunc
70	.endm
71	.text
72	.align 2
73	.if \export
74	.global EXTERN_ASM\name
75	EXTERN_ASM\name:
76	.endif
77	ELF .type \name, %function
78	.func \name
79	\name:
80	.endm
81
82	.macro const name, align=2
83	.macro endconst
84	ELF .size \name, . - \name
85	.purgem endconst
86	.endm
87	.section .rodata
88	.align \align
89	\name:
90	.endm
91
92	#if !HAVE_ARMV6T2_EXTERNAL
93	.macro movw rd, val
94	mov \rd, \val & 255
95	orr \rd, \val & ~255
96	.endm
97	#endif
98
99	.macro mov32 rd, val
100	#if HAVE_ARMV6T2_EXTERNAL
101	movw \rd, #(\val) & 0xffff
102	.if (\val) >> 16
103	movt \rd, #(\val) >> 16
104	.endif
105	#else
106	ldr \rd, =\val
107	#endif
108	.endm
109
110	.macro put_pic num
111	put_pic_\num
112	.endm
113
114	.macro do_def_pic num, val, label
115	.macro put_pic_\num
116	.if \num
117	.altmacro
118	put_pic %(\num - 1)
119	.noaltmacro
120	.endif
121	\label: .word \val
122	.purgem put_pic_\num
123	.endm
124	.endm
125
126	.macro def_pic val, label
127	.altmacro
128	do_def_pic %.Lpic_idx, \val, \label
129	.noaltmacro
130	.set .Lpic_idx, .Lpic_idx + 1
131	.endm
132
133	.macro ldpic rd, val, indir=0
134	ldr \rd, .Lpicoff\@
135	.Lpic\@:
136	.if \indir
137	A ldr \rd, [pc, \rd]
138	T add \rd, pc
139	T ldr \rd, [\rd]
140	.else
141	add \rd, pc
142	.endif
143	def_pic \val - (.Lpic\@ + (8 >> CONFIG_THUMB)), .Lpicoff\@
144	.endm
145
146	.macro movrel rd, val
147	#if CONFIG_PIC
148	ldpic \rd, \val
149	#elif HAVE_ARMV6T2_EXTERNAL && !defined(__APPLE__)
150	movw \rd, #:lower16:\val
151	movt \rd, #:upper16:\val
152	#else
153	ldr \rd, =\val
154	#endif
155	.endm
156
157	.macro movrelx rd, val, gp
158	#if CONFIG_PIC && defined(__ELF__)
159	.ifnb \gp
160	.if .Lpic_gp
161	.unreq gp
162	.endif
163	gp .req \gp
164	ldpic gp, _GLOBAL_OFFSET_TABLE_
165	.elseif !.Lpic_gp
166	gp .req r12
167	ldpic gp, _GLOBAL_OFFSET_TABLE_
168	.endif
169	.set .Lpic_gp, 1
170	ldr \rd, .Lpicoff\@
171	ldr \rd, [gp, \rd]
172	def_pic \val(GOT), .Lpicoff\@
173	#elif CONFIG_PIC && defined(__APPLE__)
174	ldpic \rd, .Lpic\@, indir=1
175	.non_lazy_symbol_pointer
176	.Lpic\@:
177	.indirect_symbol \val
178	.word 0
179	.text
180	#else
181	movrel \rd, \val
182	#endif
183	.endm
184
185	.macro add_sh rd, rn, rm, sh:vararg
186	A add \rd, \rn, \rm, \sh
187	T mov \rm, \rm, \sh
188	T add \rd, \rn, \rm
189	.endm
190
191	.macro ldr_pre rt, rn, rm:vararg
192	A ldr \rt, [\rn, \rm]!
193	T add \rn, \rn, \rm
194	T ldr \rt, [\rn]
195	.endm
196
197	.macro ldr_dpre rt, rn, rm:vararg
198	A ldr \rt, [\rn, -\rm]!
199	T sub \rn, \rn, \rm
200	T ldr \rt, [\rn]
201	.endm
202
203	.macro ldr_nreg rt, rn, rm:vararg
204	A ldr \rt, [\rn, -\rm]
205	T sub \rt, \rn, \rm
206	T ldr \rt, [\rt]
207	.endm
208
209	.macro ldr_post rt, rn, rm:vararg
210	A ldr \rt, [\rn], \rm
211	T ldr \rt, [\rn]
212	T add \rn, \rn, \rm
213	.endm
214
215	.macro ldrd_reg rt, rt2, rn, rm
216	A ldrd \rt, \rt2, [\rn, \rm]
217	T add \rt, \rn, \rm
218	T ldrd \rt, \rt2, [\rt]
219	.endm
220
221	.macro ldrd_post rt, rt2, rn, rm
222	A ldrd \rt, \rt2, [\rn], \rm
223	T ldrd \rt, \rt2, [\rn]
224	T add \rn, \rn, \rm
225	.endm
226
227	.macro ldrh_pre rt, rn, rm
228	A ldrh \rt, [\rn, \rm]!
229	T add \rn, \rn, \rm
230	T ldrh \rt, [\rn]
231	.endm
232
233	.macro ldrh_dpre rt, rn, rm
234	A ldrh \rt, [\rn, -\rm]!
235	T sub \rn, \rn, \rm
236	T ldrh \rt, [\rn]
237	.endm
238
239	.macro ldrh_post rt, rn, rm
240	A ldrh \rt, [\rn], \rm
241	T ldrh \rt, [\rn]
242	T add \rn, \rn, \rm
243	.endm
244
245	.macro ldrb_post rt, rn, rm
246	A ldrb \rt, [\rn], \rm
247	T ldrb \rt, [\rn]
248	T add \rn, \rn, \rm
249	.endm
250
251	.macro str_post rt, rn, rm:vararg
252	A str \rt, [\rn], \rm
253	T str \rt, [\rn]
254	T add \rn, \rn, \rm
255	.endm
256
257	.macro strb_post rt, rn, rm:vararg
258	A strb \rt, [\rn], \rm
259	T strb \rt, [\rn]
260	T add \rn, \rn, \rm
261	.endm
262
263	.macro strd_post rt, rt2, rn, rm
264	A strd \rt, \rt2, [\rn], \rm
265	T strd \rt, \rt2, [\rn]
266	T add \rn, \rn, \rm
267	.endm
268
269	.macro strh_pre rt, rn, rm
270	A strh \rt, [\rn, \rm]!
271	T add \rn, \rn, \rm
272	T strh \rt, [\rn]
273	.endm
274
275	.macro strh_dpre rt, rn, rm
276	A strh \rt, [\rn, -\rm]!
277	T sub \rn, \rn, \rm
278	T strh \rt, [\rn]
279	.endm
280
281	.macro strh_post rt, rn, rm
282	A strh \rt, [\rn], \rm
283	T strh \rt, [\rn]
284	T add \rn, \rn, \rm
285	.endm
286
287	.macro strh_dpost rt, rn, rm
288	A strh \rt, [\rn], -\rm
289	T strh \rt, [\rn]
290	T sub \rn, \rn, \rm
291	.endm
292
293	#if HAVE_VFP_ARGS
294	ELF .eabi_attribute 28, 1
295	# define VFP
296	# define NOVFP @
297	#else
298	# define VFP @
299	# define NOVFP
300	#endif
301
302	#define GLUE(a, b) a ## b
303	#define JOIN(a, b) GLUE(a, b)
304	#define X(s) JOIN(EXTERN_ASM, s)
305