1 /* Copyright (c) 2010 Xiph.Org Foundation
2 * Copyright (c) 2013 Parrot */
3 /*
4 Redistribution and use in source and binary forms, with or without
5 modification, are permitted provided that the following conditions
6 are met:
7
8 - Redistributions of source code must retain the above copyright
9 notice, this list of conditions and the following disclaimer.
10
11 - Redistributions in binary form must reproduce the above copyright
12 notice, this list of conditions and the following disclaimer in the
13 documentation and/or other materials provided with the distribution.
14
15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
18 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
19 OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
22 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
23 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
24 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
25 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 /* Original code from libtheora modified to suit to Opus */
29
30 #ifdef HAVE_CONFIG_H
31 #include "config.h"
32 #endif
33
34 #ifdef OPUS_HAVE_RTCD
35
36 #include "armcpu.h"
37 #include "cpu_support.h"
38 #include "os_support.h"
39 #include "opus_types.h"
40 #include "arch.h"
41
42 #define OPUS_CPU_ARM_V4_FLAG (1<<OPUS_ARCH_ARM_V4)
43 #define OPUS_CPU_ARM_EDSP_FLAG (1<<OPUS_ARCH_ARM_EDSP)
44 #define OPUS_CPU_ARM_MEDIA_FLAG (1<<OPUS_ARCH_ARM_MEDIA)
45 #define OPUS_CPU_ARM_NEON_FLAG (1<<OPUS_ARCH_ARM_NEON)
46 #define OPUS_CPU_ARM_DOTPROD_FLAG (1<<OPUS_ARCH_ARM_DOTPROD)
47
48 #if defined(_MSC_VER)
49 /*For GetExceptionCode() and EXCEPTION_ILLEGAL_INSTRUCTION.*/
50 # define WIN32_LEAN_AND_MEAN
51 # define WIN32_EXTRA_LEAN
52 # include <windows.h>
53
opus_cpu_capabilities(void)54 static OPUS_INLINE opus_uint32 opus_cpu_capabilities(void){
55 opus_uint32 flags;
56 flags=0;
57 /* MSVC has no OPUS_INLINE __asm support for ARM, but it does let you __emit
58 * instructions via their assembled hex code.
59 * All of these instructions should be essentially nops. */
60 # if defined(OPUS_ARM_MAY_HAVE_EDSP) || defined(OPUS_ARM_MAY_HAVE_MEDIA) \
61 || defined(OPUS_ARM_MAY_HAVE_NEON) || defined(OPUS_ARM_MAY_HAVE_NEON_INTR)
62 __try{
63 /*PLD [r13]*/
64 __emit(0xF5DDF000);
65 flags|=OPUS_CPU_ARM_EDSP_FLAG;
66 }
67 __except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION){
68 /*Ignore exception.*/
69 }
70 # if defined(OPUS_ARM_MAY_HAVE_MEDIA) \
71 || defined(OPUS_ARM_MAY_HAVE_NEON) || defined(OPUS_ARM_MAY_HAVE_NEON_INTR)
72 __try{
73 /*SHADD8 r3,r3,r3*/
74 __emit(0xE6333F93);
75 flags|=OPUS_CPU_ARM_MEDIA_FLAG;
76 }
77 __except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION){
78 /*Ignore exception.*/
79 }
80 # if defined(OPUS_ARM_MAY_HAVE_NEON) || defined(OPUS_ARM_MAY_HAVE_NEON_INTR)
81 __try{
82 /*VORR q0,q0,q0*/
83 __emit(0xF2200150);
84 flags|=OPUS_CPU_ARM_NEON_FLAG;
85 }
86 __except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION){
87 /*Ignore exception.*/
88 }
89 # endif
90 # endif
91 # endif
92 return flags;
93 }
94
95 #elif defined(__linux__)
96 /* Linux based */
97 #include <stdio.h>
98
opus_cpu_capabilities(void)99 opus_uint32 opus_cpu_capabilities(void)
100 {
101 opus_uint32 flags = 0;
102 FILE *cpuinfo;
103
104 /* Reading /proc/self/auxv would be easier, but that doesn't work reliably on
105 * Android */
106 cpuinfo = fopen("/proc/cpuinfo", "r");
107
108 if(cpuinfo != NULL)
109 {
110 /* 512 should be enough for anybody (it's even enough for all the flags that
111 * x86 has accumulated... so far). */
112 char buf[512];
113
114 while(fgets(buf, 512, cpuinfo) != NULL)
115 {
116 # if defined(OPUS_ARM_MAY_HAVE_EDSP) || defined(OPUS_ARM_MAY_HAVE_MEDIA) \
117 || defined(OPUS_ARM_MAY_HAVE_NEON) || defined(OPUS_ARM_MAY_HAVE_NEON_INTR)
118 /* Search for edsp and neon flag */
119 if(memcmp(buf, "Features", 8) == 0)
120 {
121 char *p;
122 p = strstr(buf, " edsp");
123 if(p != NULL && (p[5] == ' ' || p[5] == '\n'))
124 flags |= OPUS_CPU_ARM_EDSP_FLAG;
125
126 # if defined(OPUS_ARM_MAY_HAVE_NEON) || defined(OPUS_ARM_MAY_HAVE_NEON_INTR)
127 p = strstr(buf, " neon");
128 if(p != NULL && (p[5] == ' ' || p[5] == '\n'))
129 flags |= OPUS_CPU_ARM_NEON_FLAG;
130 p = strstr(buf, " asimd");
131 if(p != NULL && (p[6] == ' ' || p[6] == '\n'))
132 flags |= OPUS_CPU_ARM_NEON_FLAG | OPUS_CPU_ARM_MEDIA_FLAG | OPUS_CPU_ARM_EDSP_FLAG;
133 # endif
134 # if defined(OPUS_ARM_MAY_HAVE_DOTPROD)
135 p = strstr(buf, " asimddp");
136 if(p != NULL && (p[8] == ' ' || p[8] == '\n'))
137 flags |= OPUS_CPU_ARM_DOTPROD_FLAG;
138 # endif
139 }
140 # endif
141
142 # if defined(OPUS_ARM_MAY_HAVE_MEDIA) \
143 || defined(OPUS_ARM_MAY_HAVE_NEON) || defined(OPUS_ARM_MAY_HAVE_NEON_INTR)
144 /* Search for media capabilities (>= ARMv6) */
145 if(memcmp(buf, "CPU architecture:", 17) == 0)
146 {
147 int version;
148 version = atoi(buf+17);
149
150 if(version >= 6)
151 flags |= OPUS_CPU_ARM_MEDIA_FLAG;
152 }
153 # endif
154 }
155
156 #if defined(OPUS_ARM_PRESUME_AARCH64_NEON_INTR)
157 flags |= OPUS_CPU_ARM_EDSP_FLAG | OPUS_CPU_ARM_MEDIA_FLAG | OPUS_CPU_ARM_NEON_FLAG;
158 # if defined(OPUS_ARM_PRESUME_DOTPROD)
159 flags |= OPUS_CPU_ARM_DOTPROD_FLAG;
160 # endif
161 #endif
162
163 fclose(cpuinfo);
164 }
165 return flags;
166 }
167
168 #elif defined(__APPLE__)
169 #include <sys/types.h>
170 #include <sys/sysctl.h>
171
opus_cpu_capabilities(void)172 opus_uint32 opus_cpu_capabilities(void)
173 {
174 opus_uint32 flags = 0;
175
176 #if defined(OPUS_ARM_MAY_HAVE_DOTPROD)
177 size_t size = sizeof(uint32_t);
178 uint32_t value = 0;
179 if (!sysctlbyname("hw.optional.arm.FEAT_DotProd", &value, &size, NULL, 0) && value)
180 {
181 flags |= OPUS_CPU_ARM_DOTPROD_FLAG;
182 }
183 #endif
184
185 #if defined(OPUS_ARM_PRESUME_AARCH64_NEON_INTR)
186 flags |= OPUS_CPU_ARM_EDSP_FLAG | OPUS_CPU_ARM_MEDIA_FLAG | OPUS_CPU_ARM_NEON_FLAG;
187 # if defined(OPUS_ARM_PRESUME_DOTPROD)
188 flags |= OPUS_CPU_ARM_DOTPROD_FLAG;
189 # endif
190 #endif
191 return flags;
192 }
193
194 #else
195 /* The feature registers which can tell us what the processor supports are
196 * accessible in priveleged modes only, so we can't have a general user-space
197 * detection method like on x86.*/
198 # error "Configured to use ARM asm but no CPU detection method available for " \
199 "your platform. Reconfigure with --disable-rtcd (or send patches)."
200 #endif
201
opus_select_arch_impl(void)202 static int opus_select_arch_impl(void)
203 {
204 opus_uint32 flags = opus_cpu_capabilities();
205 int arch = 0;
206
207 if(!(flags & OPUS_CPU_ARM_EDSP_FLAG)) {
208 /* Asserts ensure arch values are sequential */
209 celt_assert(arch == OPUS_ARCH_ARM_V4);
210 return arch;
211 }
212 arch++;
213
214 if(!(flags & OPUS_CPU_ARM_MEDIA_FLAG)) {
215 celt_assert(arch == OPUS_ARCH_ARM_EDSP);
216 return arch;
217 }
218 arch++;
219
220 if(!(flags & OPUS_CPU_ARM_NEON_FLAG)) {
221 celt_assert(arch == OPUS_ARCH_ARM_MEDIA);
222 return arch;
223 }
224 arch++;
225
226 if(!(flags & OPUS_CPU_ARM_DOTPROD_FLAG)) {
227 celt_assert(arch == OPUS_ARCH_ARM_NEON);
228 return arch;
229 }
230 arch++;
231
232 celt_assert(arch == OPUS_ARCH_ARM_DOTPROD);
233 return arch;
234 }
235
opus_select_arch(void)236 int opus_select_arch(void) {
237 int arch = opus_select_arch_impl();
238 #ifdef FUZZING
239 arch = rand()%(arch+1);
240 #endif
241 return arch;
242 }
243 #endif
244