A local copy of OpenSSL from GitHub
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <setjmp.h>
#include <signal.h>
#include <openssl/bn.h>
#define PPC_FPU64 (1<<0)
#define PPC_ALTIVEC (1<<1)
static int OPENSSL_ppccap_P = 0;
static sigset_t all_masked;
#ifdef OPENSSL_BN_ASM_MONT
int bn_mul_mont(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp, const BN_ULONG *np, const BN_ULONG *n0, int num)
{
int bn_mul_mont_fpu64(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp, const BN_ULONG *np, const BN_ULONG *n0, int num);
int bn_mul_mont_int(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp, const BN_ULONG *np, const BN_ULONG *n0, int num);
if (sizeof(size_t)==4)
{
#if (defined(__APPLE__) && defined(__MACH__))
if ((OPENSSL_ppccap_P&PPC_FPU64))
return bn_mul_mont_fpu64(rp,ap,bp,np,n0,num);
#else
/* boundary of 32 was experimentally determined on
Linux 2.6.22, might have to be adjusted on AIX... */
if (num>=32 && (num&3)==0 && (OPENSSL_ppccap_P&PPC_FPU64))
{
sigset_t oset;
int ret;
sigprocmask(SIG_SETMASK,&all_masked,&oset);
ret=bn_mul_mont_fpu64(rp,ap,bp,np,n0,num);
sigprocmask(SIG_SETMASK,&oset,NULL);
return ret;
}
#endif
}
else if ((OPENSSL_ppccap_P&PPC_FPU64))
/* this is a "must" on POWER6, but run-time detection
* is not implemented yet... */
return bn_mul_mont_fpu64(rp,ap,bp,np,n0,num);
return bn_mul_mont_int(rp,ap,bp,np,n0,num);
}
#endif
static sigjmp_buf ill_jmp;
static void ill_handler (int sig) { siglongjmp(ill_jmp,sig); }
void OPENSSL_ppc64_probe(void);
void OPENSSL_cpuid_setup(void)
{
char *e;
struct sigaction ill_oact,ill_act;
sigset_t oset;
static int trigger=0;
if (trigger) return;
trigger=1;
sigfillset(&all_masked);
sigdelset(&all_masked,SIGILL);
sigdelset(&all_masked,SIGTRAP);
#ifdef SIGEMT
sigdelset(&all_masked,SIGEMT);
#endif
sigdelset(&all_masked,SIGFPE);
sigdelset(&all_masked,SIGBUS);
sigdelset(&all_masked,SIGSEGV);
if ((e=getenv("OPENSSL_ppccap")))
{
OPENSSL_ppccap_P=strtoul(e,NULL,0);
return;
}
OPENSSL_ppccap_P = 0;
memset(&ill_act,0,sizeof(ill_act));
ill_act.sa_handler = ill_handler;
ill_act.sa_mask = all_masked;
sigprocmask(SIG_SETMASK,&ill_act.sa_mask,&oset);
sigaction(SIGILL,&ill_act,&ill_oact);
if (sizeof(size_t)==4)
{
if (sigsetjmp(ill_jmp,1) == 0)
{
OPENSSL_ppc64_probe();
OPENSSL_ppccap_P |= PPC_FPU64;
}
}
else
{
/*
* Wanted code detecting POWER6 CPU and setting PPC_FPU64
*/
}
if (sigsetjmp(ill_jmp,1) == 0)
{
OPENSSL_altivec_probe();
OPENSSL_ppccap_P |= PPC_ALTIVEC;
}
sigaction (SIGILL,&ill_oact,NULL);
sigprocmask(SIG_SETMASK,&oset,NULL);
}