getcpuflags_arm.c
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/*
getcpuflags_arm: get cpuflags for ARM
copyright 1995-2014 by the mpg123 project - free software under the terms of the LGPL 2.1
see COPYING and AUTHORS files in distribution or http://mpg123.org
initially written by Taihei Momma
*/
#include <setjmp.h>
#include <signal.h>
#include "mpg123lib_intern.h"
#include "getcpuflags.h"
extern void check_neon(void);
#ifndef _M_ARM
static sigjmp_buf jmpbuf;
#else
static jmp_buf jmpbuf;
#endif
static void mpg123_arm_catch_sigill(int sig)
{
#ifndef _M_ARM
siglongjmp(jmpbuf, 1);
#else
longjmp(jmpbuf, 1);
#endif
}
unsigned int getcpuflags(struct cpuflags* cf)
{
#ifndef _M_ARM
struct sigaction act, act_old;
act.sa_handler = mpg123_arm_catch_sigill;
act.sa_flags = SA_RESTART;
sigemptyset(&act.sa_mask);
sigaction(SIGILL, &act, &act_old);
cf->has_neon = 0;
if(!sigsetjmp(jmpbuf, 1)) {
check_neon();
cf->has_neon = 1;
}
sigaction(SIGILL, &act_old, NULL);
#else
cf->has_neon = 0;
if (!setjmp(jmpbuf)) {
signal(SIGILL, mpg123_arm_catch_sigill);
check_neon();
cf->has_neon = 1;
}
signal(SIGILL, SIG_DFL);
#endif
return 0;
}