sparcv9cap.c

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <setjmp.h>
#include <signal.h>
#include <sys/time.h>
#include <openssl/bn.h>

#define SPARCV9_TICK_PRIVILEGED (1<<0)
#define SPARCV9_PREFER_FPU  (1<<1)
#define SPARCV9_VIS1        (1<<2)
#define SPARCV9_VIS2        (1<<3)  /* reserved */
#define SPARCV9_FMADD       (1<<4)  /* reserved for SPARC64 V */

static int OPENSSL_sparcv9cap_P=SPARCV9_TICK_PRIVILEGED;

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_fpu(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 (num>=8 && !(num&1) &&
        (OPENSSL_sparcv9cap_P&(SPARCV9_PREFER_FPU|SPARCV9_VIS1)) ==
        (SPARCV9_PREFER_FPU|SPARCV9_VIS1))
        return bn_mul_mont_fpu(rp,ap,bp,np,n0,num);
    else
        return bn_mul_mont_int(rp,ap,bp,np,n0,num);
    }

unsigned long   _sparcv9_rdtick(void);
void        _sparcv9_vis1_probe(void);
unsigned long   _sparcv9_vis1_instrument(void);
void        _sparcv9_vis2_probe(void);
void        _sparcv9_fmadd_probe(void);

unsigned long OPENSSL_rdtsc(void)
    {
    if (OPENSSL_sparcv9cap_P&SPARCV9_TICK_PRIVILEGED)
#if defined(__sun) && defined(__SVR4)
        return gethrtime();
#else
        return 0;
#endif
    else
        return _sparcv9_rdtick();
    }

#if 0 && defined(__sun) && defined(__SVR4)
/* This code path is disabled, because of incompatibility of
 * libdevinfo.so.1 and libmalloc.so.1 (see below for details)
 */
#include <malloc.h>
#include <dlfcn.h>
#include <libdevinfo.h>
#include <sys/systeminfo.h>

typedef di_node_t (*di_init_t)(const char *,uint_t);
typedef void      (*di_fini_t)(di_node_t);
typedef char *    (*di_node_name_t)(di_node_t);
typedef int       (*di_walk_node_t)(di_node_t,uint_t,di_node_name_t,int (*)(di_node_t,di_node_name_t));

#define DLLINK(h,name) (name=(name##_t)dlsym((h),#name))

static int walk_nodename(di_node_t node, di_node_name_t di_node_name)
    {
    char *name = (*di_node_name)(node);

    /* This is expected to catch all UltraSPARC flavors prior T1 */
    if (!strcmp (name,"SUNW,UltraSPARC") ||
        !strncmp(name,"SUNW,UltraSPARC-I",17))  /* covers II,III,IV */
        {
        OPENSSL_sparcv9cap_P |= SPARCV9_PREFER_FPU|SPARCV9_VIS1;

        /* %tick is privileged only on UltraSPARC-I/II, but not IIe */
        if (name[14]!='\0' && name[17]!='\0' && name[18]!='\0')
            OPENSSL_sparcv9cap_P &= ~SPARCV9_TICK_PRIVILEGED;

        return DI_WALK_TERMINATE;
        }
    /* This is expected to catch remaining UltraSPARCs, such as T1 */
    else if (!strncmp(name,"SUNW,UltraSPARC",15))
        {
        OPENSSL_sparcv9cap_P &= ~SPARCV9_TICK_PRIVILEGED;

        return DI_WALK_TERMINATE;
        }

    return DI_WALK_CONTINUE;
    }

void OPENSSL_cpuid_setup(void)
    {
    void *h;
    char *e,si[256];
    static int trigger=0;

    if (trigger) return;
    trigger=1;

    if ((e=getenv("OPENSSL_sparcv9cap")))
        {
        OPENSSL_sparcv9cap_P=strtoul(e,NULL,0);
        return;
        }

    if (sysinfo(SI_MACHINE,si,sizeof(si))>0)
        {
        if (strcmp(si,"sun4v"))
            /* FPU is preferred for all CPUs, but US-T1/2 */
            OPENSSL_sparcv9cap_P |= SPARCV9_PREFER_FPU;
        }

    if (sysinfo(SI_ISALIST,si,sizeof(si))>0)
        {
        if (strstr(si,"+vis"))
            OPENSSL_sparcv9cap_P |= SPARCV9_VIS1;
        if (strstr(si,"+vis2"))
            {
            OPENSSL_sparcv9cap_P |= SPARCV9_VIS2;
            OPENSSL_sparcv9cap_P &= ~SPARCV9_TICK_PRIVILEGED;
            return;
            }
        }
#ifdef M_KEEP
    /*
     * Solaris libdevinfo.so.1 is effectively incomatible with
     * libmalloc.so.1. Specifically, if application is linked with
     * -lmalloc, it crashes upon startup with SIGSEGV in
     * free(3LIBMALLOC) called by di_fini. Prior call to
     * mallopt(M_KEEP,0) somehow helps... But not always...
     */
    if ((h = dlopen(NULL,RTLD_LAZY)))
        {
        union { void *p; int (*f)(int,int); } sym;
        if ((sym.p = dlsym(h,"mallopt"))) (*sym.f)(M_KEEP,0);
        dlclose(h);
        }
#endif
    if ((h = dlopen("libdevinfo.so.1",RTLD_LAZY))) do
        {
        di_init_t   di_init;
        di_fini_t   di_fini;
        di_walk_node_t  di_walk_node;
        di_node_name_t  di_node_name;
        di_node_t   root_node;

        if (!DLLINK(h,di_init))     break;
        if (!DLLINK(h,di_fini))     break;
        if (!DLLINK(h,di_walk_node))    break;
        if (!DLLINK(h,di_node_name))    break;

        if ((root_node = (*di_init)("/",DINFOSUBTREE))!=DI_NODE_NIL)
            {
            (*di_walk_node)(root_node,DI_WALK_SIBFIRST,
                    di_node_name,walk_nodename);
            (*di_fini)(root_node);
            }
        } while(0);

    if (h) dlclose(h);
    }

#else

static sigjmp_buf common_jmp;
static void common_handler(int sig) { siglongjmp(common_jmp,sig); }

void OPENSSL_cpuid_setup(void)
    {
    char *e;
    struct sigaction    common_act,ill_oact,bus_oact;
    sigset_t        all_masked,oset;
    static int trigger=0;

    if (trigger) return;
    trigger=1;
 
    if ((e=getenv("OPENSSL_sparcv9cap")))
        {
        OPENSSL_sparcv9cap_P=strtoul(e,NULL,0);
        return;
        }

    /* Initial value, fits UltraSPARC-I&II... */
    OPENSSL_sparcv9cap_P = SPARCV9_PREFER_FPU|SPARCV9_TICK_PRIVILEGED;

    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);
    sigprocmask(SIG_SETMASK,&all_masked,&oset);

    memset(&common_act,0,sizeof(common_act));
    common_act.sa_handler = common_handler;
    common_act.sa_mask    = all_masked;

    sigaction(SIGILL,&common_act,&ill_oact);
    sigaction(SIGBUS,&common_act,&bus_oact);/* T1 fails 16-bit ldda [on Linux] */

    if (sigsetjmp(common_jmp,1) == 0)
        {
        _sparcv9_rdtick();
        OPENSSL_sparcv9cap_P &= ~SPARCV9_TICK_PRIVILEGED;
        }

    if (sigsetjmp(common_jmp,1) == 0)
        {
        _sparcv9_vis1_probe();
        OPENSSL_sparcv9cap_P |= SPARCV9_VIS1;
        /* detect UltraSPARC-Tx, see sparccpud.S for details... */
        if (_sparcv9_vis1_instrument() >= 12)
            OPENSSL_sparcv9cap_P &= ~(SPARCV9_VIS1|SPARCV9_PREFER_FPU);
        else
            {
            _sparcv9_vis2_probe();
            OPENSSL_sparcv9cap_P |= SPARCV9_VIS2;
            }
        }

    if (sigsetjmp(common_jmp,1) == 0)
        {
        _sparcv9_fmadd_probe();
        OPENSSL_sparcv9cap_P |= SPARCV9_FMADD;
        }

    sigaction(SIGBUS,&bus_oact,NULL);
    sigaction(SIGILL,&ill_oact,NULL);

    sigprocmask(SIG_SETMASK,&oset,NULL);
    }

#endif