/*

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;

}