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sparcv9cap.c

#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 ((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;
      int               sig;
      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

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