summaryrefslogtreecommitdiffstats
path: root/media/libopus/celt/arm/armcpu.c
blob: c7d16e6d61616bee9ade7a6c8e3116e7eda33c02 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
/* Copyright (c) 2010 Xiph.Org Foundation
 * Copyright (c) 2013 Parrot */
/*
   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:

   - Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.

   - Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
   OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

/* Original code from libtheora modified to suit to Opus */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef OPUS_HAVE_RTCD

#include "armcpu.h"
#include "cpu_support.h"
#include "os_support.h"
#include "opus_types.h"
#include "arch.h"

#define OPUS_CPU_ARM_V4_FLAG    (1<<OPUS_ARCH_ARM_V4)
#define OPUS_CPU_ARM_EDSP_FLAG  (1<<OPUS_ARCH_ARM_EDSP)
#define OPUS_CPU_ARM_MEDIA_FLAG (1<<OPUS_ARCH_ARM_MEDIA)
#define OPUS_CPU_ARM_NEON_FLAG  (1<<OPUS_ARCH_ARM_NEON)

#if defined(_MSC_VER)
/*For GetExceptionCode() and EXCEPTION_ILLEGAL_INSTRUCTION.*/
# define WIN32_LEAN_AND_MEAN
# define WIN32_EXTRA_LEAN
# include <windows.h>

static OPUS_INLINE opus_uint32 opus_cpu_capabilities(void){
  opus_uint32 flags;
  flags=0;
  /* MSVC has no OPUS_INLINE __asm support for ARM, but it does let you __emit
   * instructions via their assembled hex code.
   * All of these instructions should be essentially nops. */
# if defined(OPUS_ARM_MAY_HAVE_EDSP) || defined(OPUS_ARM_MAY_HAVE_MEDIA) \
 || defined(OPUS_ARM_MAY_HAVE_NEON) || defined(OPUS_ARM_MAY_HAVE_NEON_INTR)
  __try{
    /*PLD [r13]*/
    __emit(0xF5DDF000);
    flags|=OPUS_CPU_ARM_EDSP_FLAG;
  }
  __except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION){
    /*Ignore exception.*/
  }
#  if defined(OPUS_ARM_MAY_HAVE_MEDIA) \
 || defined(OPUS_ARM_MAY_HAVE_NEON) || defined(OPUS_ARM_MAY_HAVE_NEON_INTR)
  __try{
    /*SHADD8 r3,r3,r3*/
    __emit(0xE6333F93);
    flags|=OPUS_CPU_ARM_MEDIA_FLAG;
  }
  __except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION){
    /*Ignore exception.*/
  }
#   if defined(OPUS_ARM_MAY_HAVE_NEON) || defined(OPUS_ARM_MAY_HAVE_NEON_INTR)
  __try{
    /*VORR q0,q0,q0*/
    __emit(0xF2200150);
    flags|=OPUS_CPU_ARM_NEON_FLAG;
  }
  __except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION){
    /*Ignore exception.*/
  }
#   endif
#  endif
# endif
  return flags;
}

#elif defined(__linux__)
/* Linux based */
#include <stdio.h>

opus_uint32 opus_cpu_capabilities(void)
{
  opus_uint32 flags = 0;
  FILE *cpuinfo;

  /* Reading /proc/self/auxv would be easier, but that doesn't work reliably on
   * Android */
  cpuinfo = fopen("/proc/cpuinfo", "r");

  if(cpuinfo != NULL)
  {
    /* 512 should be enough for anybody (it's even enough for all the flags that
     * x86 has accumulated... so far). */
    char buf[512];

    while(fgets(buf, 512, cpuinfo) != NULL)
    {
# if defined(OPUS_ARM_MAY_HAVE_EDSP) || defined(OPUS_ARM_MAY_HAVE_MEDIA) \
 || defined(OPUS_ARM_MAY_HAVE_NEON) || defined(OPUS_ARM_MAY_HAVE_NEON_INTR)
      /* Search for edsp and neon flag */
      if(memcmp(buf, "Features", 8) == 0)
      {
        char *p;
        p = strstr(buf, " edsp");
        if(p != NULL && (p[5] == ' ' || p[5] == '\n'))
          flags |= OPUS_CPU_ARM_EDSP_FLAG;

#  if defined(OPUS_ARM_MAY_HAVE_NEON) || defined(OPUS_ARM_MAY_HAVE_NEON_INTR)
        p = strstr(buf, " neon");
        if(p != NULL && (p[5] == ' ' || p[5] == '\n'))
          flags |= OPUS_CPU_ARM_NEON_FLAG;
#  endif
      }
# endif

# if defined(OPUS_ARM_MAY_HAVE_MEDIA) \
 || defined(OPUS_ARM_MAY_HAVE_NEON) || defined(OPUS_ARM_MAY_HAVE_NEON_INTR)
      /* Search for media capabilities (>= ARMv6) */
      if(memcmp(buf, "CPU architecture:", 17) == 0)
      {
        int version;
        version = atoi(buf+17);

        if(version >= 6)
          flags |= OPUS_CPU_ARM_MEDIA_FLAG;
      }
# endif
    }

    fclose(cpuinfo);
  }
  return flags;
}
#else
/* The feature registers which can tell us what the processor supports are
 * accessible in priveleged modes only, so we can't have a general user-space
 * detection method like on x86.*/
# error "Configured to use ARM asm but no CPU detection method available for " \
   "your platform.  Reconfigure with --disable-rtcd (or send patches)."
#endif

static int opus_select_arch_impl(void)
{
  opus_uint32 flags = opus_cpu_capabilities();
  int arch = 0;

  if(!(flags & OPUS_CPU_ARM_EDSP_FLAG)) {
    /* Asserts ensure arch values are sequential */
    celt_assert(arch == OPUS_ARCH_ARM_V4);
    return arch;
  }
  arch++;

  if(!(flags & OPUS_CPU_ARM_MEDIA_FLAG)) {
    celt_assert(arch == OPUS_ARCH_ARM_EDSP);
    return arch;
  }
  arch++;

  if(!(flags & OPUS_CPU_ARM_NEON_FLAG)) {
    celt_assert(arch == OPUS_ARCH_ARM_MEDIA);
    return arch;
  }
  arch++;

  celt_assert(arch == OPUS_ARCH_ARM_NEON);
  return arch;
}

int opus_select_arch(void) {
  int arch = opus_select_arch_impl();
#ifdef FUZZING
  arch = rand()%(arch+1);
#endif
  return arch;
}
#endif