ppccap.c

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <setjmp.h>
#include <signal.h>
#include <crypto.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 (num>=8 && (num&3)==0 && (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);
    }