path: root/libavutil/arm/asm.S (plain)
blob: 2b0d0f67e84fd58d423e2ff9af949200326368d1

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, relocate=0
83	.macro endconst
84	ELF .size \name, . - \name
85	.purgem endconst
86	.endm
87	.if HAVE_SECTION_DATA_REL_RO && \relocate
88	.section .data.rel.ro
89	.else
90	.section .rodata
91	.endif
92	.align \align
93	\name:
94	.endm
95
96	#if !HAVE_ARMV6T2_EXTERNAL
97	.macro movw rd, val
98	mov \rd, \val & 255
99	orr \rd, \val & ~255
100	.endm
101	#endif
102
103	.macro mov32 rd, val
104	#if HAVE_ARMV6T2_EXTERNAL
105	movw \rd, #(\val) & 0xffff
106	.if (\val) >> 16
107	movt \rd, #(\val) >> 16
108	.endif
109	#else
110	ldr \rd, =\val
111	#endif
112	.endm
113
114	.macro put_pic num
115	put_pic_\num
116	.endm
117
118	.macro do_def_pic num, val, label
119	.macro put_pic_\num
120	.if \num
121	.altmacro
122	put_pic %(\num - 1)
123	.noaltmacro
124	.endif
125	\label: .word \val
126	.purgem put_pic_\num
127	.endm
128	.endm
129
130	.macro def_pic val, label
131	.altmacro
132	do_def_pic %.Lpic_idx, \val, \label
133	.noaltmacro
134	.set .Lpic_idx, .Lpic_idx + 1
135	.endm
136
137	.macro ldpic rd, val, indir=0
138	ldr \rd, .Lpicoff\@
139	.Lpic\@:
140	.if \indir
141	A ldr \rd, [pc, \rd]
142	T add \rd, pc
143	T ldr \rd, [\rd]
144	.else
145	add \rd, pc
146	.endif
147	def_pic \val - (.Lpic\@ + (8 >> CONFIG_THUMB)), .Lpicoff\@
148	.endm
149
150	.macro movrel rd, val
151	#if CONFIG_PIC
152	ldpic \rd, \val
153	#elif HAVE_ARMV6T2_EXTERNAL && !defined(__APPLE__)
154	movw \rd, #:lower16:\val
155	movt \rd, #:upper16:\val
156	#else
157	ldr \rd, =\val
158	#endif
159	.endm
160
161	.macro movrelx rd, val, gp
162	#if CONFIG_PIC && defined(__ELF__)
163	.ifnb \gp
164	.if .Lpic_gp
165	.unreq gp
166	.endif
167	gp .req \gp
168	ldpic gp, _GLOBAL_OFFSET_TABLE_
169	.elseif !.Lpic_gp
170	gp .req r12
171	ldpic gp, _GLOBAL_OFFSET_TABLE_
172	.endif
173	.set .Lpic_gp, 1
174	ldr \rd, .Lpicoff\@
175	ldr \rd, [gp, \rd]
176	def_pic \val(GOT), .Lpicoff\@
177	#elif CONFIG_PIC && defined(__APPLE__)
178	ldpic \rd, .Lpic\@, indir=1
179	.non_lazy_symbol_pointer
180	.Lpic\@:
181	.indirect_symbol \val
182	.word 0
183	.text
184	#else
185	movrel \rd, \val
186	#endif
187	.endm
188
189	.macro add_sh rd, rn, rm, sh:vararg
190	A add \rd, \rn, \rm, \sh
191	T mov \rm, \rm, \sh
192	T add \rd, \rn, \rm
193	.endm
194
195	.macro ldr_pre rt, rn, rm:vararg
196	A ldr \rt, [\rn, \rm]!
197	T add \rn, \rn, \rm
198	T ldr \rt, [\rn]
199	.endm
200
201	.macro ldr_dpre rt, rn, rm:vararg
202	A ldr \rt, [\rn, -\rm]!
203	T sub \rn, \rn, \rm
204	T ldr \rt, [\rn]
205	.endm
206
207	.macro ldr_nreg rt, rn, rm:vararg
208	A ldr \rt, [\rn, -\rm]
209	T sub \rt, \rn, \rm
210	T ldr \rt, [\rt]
211	.endm
212
213	.macro ldr_post rt, rn, rm:vararg
214	A ldr \rt, [\rn], \rm
215	T ldr \rt, [\rn]
216	T add \rn, \rn, \rm
217	.endm
218
219	.macro ldrd_reg rt, rt2, rn, rm
220	A ldrd \rt, \rt2, [\rn, \rm]
221	T add \rt, \rn, \rm
222	T ldrd \rt, \rt2, [\rt]
223	.endm
224
225	.macro ldrd_post rt, rt2, rn, rm
226	A ldrd \rt, \rt2, [\rn], \rm
227	T ldrd \rt, \rt2, [\rn]
228	T add \rn, \rn, \rm
229	.endm
230
231	.macro ldrh_pre rt, rn, rm
232	A ldrh \rt, [\rn, \rm]!
233	T add \rn, \rn, \rm
234	T ldrh \rt, [\rn]
235	.endm
236
237	.macro ldrh_dpre rt, rn, rm
238	A ldrh \rt, [\rn, -\rm]!
239	T sub \rn, \rn, \rm
240	T ldrh \rt, [\rn]
241	.endm
242
243	.macro ldrh_post rt, rn, rm
244	A ldrh \rt, [\rn], \rm
245	T ldrh \rt, [\rn]
246	T add \rn, \rn, \rm
247	.endm
248
249	.macro ldrb_post rt, rn, rm
250	A ldrb \rt, [\rn], \rm
251	T ldrb \rt, [\rn]
252	T add \rn, \rn, \rm
253	.endm
254
255	.macro str_post rt, rn, rm:vararg
256	A str \rt, [\rn], \rm
257	T str \rt, [\rn]
258	T add \rn, \rn, \rm
259	.endm
260
261	.macro strb_post rt, rn, rm:vararg
262	A strb \rt, [\rn], \rm
263	T strb \rt, [\rn]
264	T add \rn, \rn, \rm
265	.endm
266
267	.macro strd_post rt, rt2, rn, rm
268	A strd \rt, \rt2, [\rn], \rm
269	T strd \rt, \rt2, [\rn]
270	T add \rn, \rn, \rm
271	.endm
272
273	.macro strh_pre rt, rn, rm
274	A strh \rt, [\rn, \rm]!
275	T add \rn, \rn, \rm
276	T strh \rt, [\rn]
277	.endm
278
279	.macro strh_dpre rt, rn, rm
280	A strh \rt, [\rn, -\rm]!
281	T sub \rn, \rn, \rm
282	T strh \rt, [\rn]
283	.endm
284
285	.macro strh_post rt, rn, rm
286	A strh \rt, [\rn], \rm
287	T strh \rt, [\rn]
288	T add \rn, \rn, \rm
289	.endm
290
291	.macro strh_dpost rt, rn, rm
292	A strh \rt, [\rn], -\rm
293	T strh \rt, [\rn]
294	T sub \rn, \rn, \rm
295	.endm
296
297	#if HAVE_VFP_ARGS
298	ELF .eabi_attribute 28, 1
299	# define VFP
300	# define NOVFP @
301	#else
302	# define VFP @
303	# define NOVFP
304	#endif
305
306	#define GLUE(a, b) a ## b
307	#define JOIN(a, b) GLUE(a, b)
308	#define X(s) JOIN(EXTERN_ASM, s)
309