mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-10 11:54:40 +00:00
237 lines
5.9 KiB
C++
237 lines
5.9 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
/* compile-time and runtime tests for whether to use various ARM extensions */
|
|
|
|
#include "arm.h"
|
|
|
|
#if defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
|
|
|
|
// arm.h has parallel #ifs which declare MOZILLA_ARM_HAVE_CPUID_DETECTION.
|
|
// We don't check it here so that we get compile errors if it's defined, but
|
|
// we don't compile one of these detection methods. The detection code here is
|
|
// based on the CPU detection in libtheora.
|
|
|
|
# if defined(_MSC_VER)
|
|
//For GetExceptionCode() and EXCEPTION_ILLEGAL_INSTRUCTION.
|
|
# define WIN32_LEAN_AND_MEAN
|
|
# define WIN32_EXTRA_LEAN
|
|
# include <windows.h>
|
|
|
|
# if !defined(MOZILLA_PRESUME_EDSP)
|
|
static bool
|
|
check_edsp(void)
|
|
{
|
|
# if defined(MOZILLA_MAY_SUPPORT_EDSP)
|
|
__try
|
|
{
|
|
//PLD [r13]
|
|
__emit(0xF5DDF000);
|
|
return true;
|
|
}
|
|
__except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION)
|
|
{
|
|
//Ignore exception.
|
|
}
|
|
# endif
|
|
return false;
|
|
}
|
|
# endif // !MOZILLA_PRESUME_EDSP
|
|
|
|
# if !defined(MOZILLA_PRESUME_ARMV6)
|
|
static bool
|
|
check_armv6(void)
|
|
{
|
|
# if defined(MOZILLA_MAY_SUPPORT_ARMV6)
|
|
__try
|
|
{
|
|
//SHADD8 r3,r3,r3
|
|
__emit(0xE6333F93);
|
|
return true;
|
|
}
|
|
__except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION)
|
|
{
|
|
//Ignore exception.
|
|
}
|
|
# endif
|
|
return false;
|
|
}
|
|
# endif // !MOZILLA_PRESUME_ARMV6
|
|
|
|
# if !defined(MOZILLA_PRESUME_ARMV7)
|
|
static bool
|
|
check_armv7(void)
|
|
{
|
|
# if defined(MOZILLA_MAY_SUPPORT_ARMV7)
|
|
__try
|
|
{
|
|
// ARMv7 DMB (Data Memory Barrier) for stores (DMB.ST)
|
|
// The Data Memory Barrier existed before ARMv7 as a
|
|
// cp15 operation, but ARMv7 introduced a dedicated
|
|
// instruction, DMB.
|
|
emit(0xF57FF05E);
|
|
return true;
|
|
}
|
|
__except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION)
|
|
{
|
|
//Ignore exception.
|
|
}
|
|
# endif
|
|
return false;
|
|
}
|
|
# endif // !MOZILLA_PRESUME_ARMV7
|
|
|
|
# if !defined(MOZILLA_PRESUME_NEON)
|
|
static bool
|
|
check_neon(void)
|
|
{
|
|
# if defined(MOZILLA_MAY_SUPPORT_NEON)
|
|
__try
|
|
{
|
|
//VORR q0,q0,q0
|
|
__emit(0xF2200150);
|
|
return true;
|
|
}
|
|
__except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION)
|
|
{
|
|
//Ignore exception.
|
|
}
|
|
# endif
|
|
return false;
|
|
}
|
|
# endif // !MOZILLA_PRESUME_NEON
|
|
|
|
# elif defined(__linux__) || defined(ANDROID)
|
|
# include <stdio.h>
|
|
# include <stdlib.h>
|
|
# include <string.h>
|
|
|
|
enum{
|
|
MOZILLA_HAS_EDSP_FLAG=1,
|
|
MOZILLA_HAS_ARMV6_FLAG=2,
|
|
MOZILLA_HAS_ARMV7_FLAG=4,
|
|
MOZILLA_HAS_NEON_FLAG=8
|
|
};
|
|
|
|
static unsigned
|
|
get_arm_cpu_flags(void)
|
|
{
|
|
unsigned flags;
|
|
FILE *fin;
|
|
bool armv6_processor = false;
|
|
flags = 0;
|
|
/*Reading /proc/self/auxv would be easier, but that doesn't work reliably on
|
|
Android. This also means that detection will fail in Scratchbox, which is
|
|
desirable, as NEON does not work in the qemu shipped with the Maemo 5 SDK.
|
|
I don't know if /proc/self/auxv would do any better in that case, anyway,
|
|
or if it would return random flags from the host CPU.*/
|
|
fin = fopen ("/proc/cpuinfo","r");
|
|
if (fin != nullptr)
|
|
{
|
|
/*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, 511, fin) != nullptr)
|
|
{
|
|
if (memcmp(buf, "Features", 8) == 0)
|
|
{
|
|
char *p;
|
|
p = strstr(buf, " edsp");
|
|
if (p != nullptr && (p[5] == ' ' || p[5] == '\n'))
|
|
flags |= MOZILLA_HAS_EDSP_FLAG;
|
|
p = strstr(buf, " neon");
|
|
if( p != nullptr && (p[5] == ' ' || p[5] == '\n'))
|
|
flags |= MOZILLA_HAS_NEON_FLAG;
|
|
}
|
|
if (memcmp(buf, "CPU architecture:", 17) == 0)
|
|
{
|
|
int version;
|
|
version = atoi(buf + 17);
|
|
if (version >= 6)
|
|
flags |= MOZILLA_HAS_ARMV6_FLAG;
|
|
if (version >= 7)
|
|
flags |= MOZILLA_HAS_ARMV7_FLAG;
|
|
}
|
|
/* media/webrtc/trunk/src/system_wrappers/source/cpu_features_arm.c
|
|
* Unfortunately, it seems that certain ARMv6-based CPUs
|
|
* report an incorrect architecture number of 7!
|
|
*
|
|
* We try to correct this by looking at the 'elf_format'
|
|
* field reported by the 'Processor' field, which is of the
|
|
* form of "(v7l)" for an ARMv7-based CPU, and "(v6l)" for
|
|
* an ARMv6-one.
|
|
*/
|
|
if (memcmp(buf, "Processor\t:", 11) == 0) {
|
|
if (strstr(buf, "(v6l)") != 0) {
|
|
armv6_processor = true;
|
|
}
|
|
}
|
|
}
|
|
fclose(fin);
|
|
}
|
|
if (armv6_processor) {
|
|
// ARMv6 pretending to be ARMv7? clear flag
|
|
if (flags & MOZILLA_HAS_ARMV7_FLAG) {
|
|
flags &= ~MOZILLA_HAS_ARMV7_FLAG;
|
|
}
|
|
}
|
|
return flags;
|
|
}
|
|
|
|
// Cache a local copy so we only have to read /proc/cpuinfo once.
|
|
static unsigned arm_cpu_flags = get_arm_cpu_flags();
|
|
|
|
# if !defined(MOZILLA_PRESUME_EDSP)
|
|
static bool
|
|
check_edsp(void)
|
|
{
|
|
return (arm_cpu_flags & MOZILLA_HAS_EDSP_FLAG) != 0;
|
|
}
|
|
# endif
|
|
|
|
# if !defined(MOZILLA_PRESUME_ARMV6)
|
|
static bool
|
|
check_armv6(void)
|
|
{
|
|
return (arm_cpu_flags & MOZILLA_HAS_ARMV6_FLAG) != 0;
|
|
}
|
|
# endif
|
|
|
|
# if !defined(MOZILLA_PRESUME_ARMV7)
|
|
static bool
|
|
check_armv7(void)
|
|
{
|
|
return (arm_cpu_flags & MOZILLA_HAS_ARMV7_FLAG) != 0;
|
|
}
|
|
# endif
|
|
|
|
# if !defined(MOZILLA_PRESUME_NEON)
|
|
static bool
|
|
check_neon(void)
|
|
{
|
|
return (arm_cpu_flags & MOZILLA_HAS_NEON_FLAG) != 0;
|
|
}
|
|
# endif
|
|
|
|
# endif // defined(__linux__) || defined(ANDROID)
|
|
|
|
namespace mozilla {
|
|
namespace arm_private {
|
|
# if !defined(MOZILLA_PRESUME_EDSP)
|
|
bool edsp_enabled = check_edsp();
|
|
# endif
|
|
# if !defined(MOZILLA_PRESUME_ARMV6)
|
|
bool armv6_enabled = check_armv6();
|
|
# endif
|
|
# if !defined(MOZILLA_PRESUME_ARMV7)
|
|
bool armv7_enabled = check_armv7();
|
|
# endif
|
|
# if !defined(MOZILLA_PRESUME_NEON)
|
|
bool neon_enabled = check_neon();
|
|
# endif
|
|
} // namespace arm_private
|
|
} // namespace mozilla
|
|
|
|
#endif // MOZILLA_ARM_HAVE_CPUID_DETECTION
|