crypto/sparcv9cap.c

   1 /*
   2  * Copyright 2005-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <setjmp.h>
  14 #include <signal.h>
  15 #include <sys/time.h>
  16 #include <unistd.h>
  17 #include <openssl/bn.h>
  18
  19 #include "sparc_arch.h"
  20
  21 #if defined(__GNUC__) && defined(__linux)
  22 __attribute__ ((visibility("hidden")))
  23 #endif
  24 unsigned int OPENSSL_sparcv9cap_P[2] = { SPARCV9_TICK_PRIVILEGED, 0 };
  25
  26 int bn_mul_mont(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,
  27                 const BN_ULONG *np, const BN_ULONG *n0, int num)
  28 {
  29     int bn_mul_mont_vis3(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,
  30                          const BN_ULONG *np, const BN_ULONG *n0, int num);
  31     int bn_mul_mont_fpu(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,
  32                         const BN_ULONG *np, const BN_ULONG *n0, int num);
  33     int bn_mul_mont_int(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,
  34                         const BN_ULONG *np, const BN_ULONG *n0, int num);
  35
  36     if (!(num & 1) && num >= 6) {
  37         if ((num & 15) == 0 && num <= 64 &&
  38             (OPENSSL_sparcv9cap_P[1] & (CFR_MONTMUL | CFR_MONTSQR)) ==
  39             (CFR_MONTMUL | CFR_MONTSQR)) {
  40             typedef int (*bn_mul_mont_f) (BN_ULONG *rp, const BN_ULONG *ap,
  41                                           const BN_ULONG *bp,
  42                                           const BN_ULONG *np,
  43                                           const BN_ULONG *n0);
  44             int bn_mul_mont_t4_8(BN_ULONG *rp, const BN_ULONG *ap,
  45                                  const BN_ULONG *bp, const BN_ULONG *np,
  46                                  const BN_ULONG *n0);
  47             int bn_mul_mont_t4_16(BN_ULONG *rp, const BN_ULONG *ap,
  48                                   const BN_ULONG *bp, const BN_ULONG *np,
  49                                   const BN_ULONG *n0);
  50             int bn_mul_mont_t4_24(BN_ULONG *rp, const BN_ULONG *ap,
  51                                   const BN_ULONG *bp, const BN_ULONG *np,
  52                                   const BN_ULONG *n0);
  53             int bn_mul_mont_t4_32(BN_ULONG *rp, const BN_ULONG *ap,
  54                                   const BN_ULONG *bp, const BN_ULONG *np,
  55                                   const BN_ULONG *n0);
  56             static const bn_mul_mont_f funcs[4] = {
  57                 bn_mul_mont_t4_8, bn_mul_mont_t4_16,
  58                 bn_mul_mont_t4_24, bn_mul_mont_t4_32
  59             };
  60             bn_mul_mont_f worker = funcs[num / 16 - 1];
  61
  62             if ((*worker) (rp, ap, bp, np, n0))
  63                 return 1;
  64             /* retry once and fall back */
  65             if ((*worker) (rp, ap, bp, np, n0))
  66                 return 1;
  67             return bn_mul_mont_vis3(rp, ap, bp, np, n0, num);
  68         }
  69         if ((OPENSSL_sparcv9cap_P[0] & SPARCV9_VIS3))
  70             return bn_mul_mont_vis3(rp, ap, bp, np, n0, num);
  71         else if (num >= 8 &&
  72                  /*
  73                   * bn_mul_mont_fpu doesn't use FMADD, we just use the
  74                   * flag to detect when FPU path is preferable in cases
  75                   * when current heuristics is unreliable. [it works
  76                   * out because FMADD-capable processors where FPU
  77                   * code path is undesirable are also VIS3-capable and
  78                   * VIS3 code path takes precedence.]
  79                   */
  80                  ( (OPENSSL_sparcv9cap_P[0] & SPARCV9_FMADD) ||
  81                    (OPENSSL_sparcv9cap_P[0] &
  82                     (SPARCV9_PREFER_FPU | SPARCV9_VIS1)) ==
  83                    (SPARCV9_PREFER_FPU | SPARCV9_VIS1) ))
  84             return bn_mul_mont_fpu(rp, ap, bp, np, n0, num);
  85     }
  86     return bn_mul_mont_int(rp, ap, bp, np, n0, num);
  87 }
  88
  89 unsigned long _sparcv9_rdtick(void);
  90 void _sparcv9_vis1_probe(void);
  91 unsigned long _sparcv9_vis1_instrument(void);
  92 void _sparcv9_vis2_probe(void);
  93 void _sparcv9_fmadd_probe(void);
  94 unsigned long _sparcv9_rdcfr(void);
  95 void _sparcv9_vis3_probe(void);
  96 void _sparcv9_fjaesx_probe(void);
  97 unsigned long _sparcv9_random(void);
  98 size_t _sparcv9_vis1_instrument_bus(unsigned int *, size_t);
  99 size_t _sparcv9_vis1_instrument_bus2(unsigned int *, size_t, size_t);
 100
 101 unsigned long OPENSSL_rdtsc(void)
 102 {
 103     if (OPENSSL_sparcv9cap_P[0] & SPARCV9_TICK_PRIVILEGED)
 104 #if defined(__sun) && defined(__SVR4)
 105         return gethrtime();
 106 #else
 107         return 0;
 108 #endif
 109     else
 110         return _sparcv9_rdtick();
 111 }
 112
 113 size_t OPENSSL_instrument_bus(unsigned int *out, size_t cnt)
 114 {
 115     if ((OPENSSL_sparcv9cap_P[0] & (SPARCV9_TICK_PRIVILEGED | SPARCV9_BLK)) ==
 116         SPARCV9_BLK)
 117         return _sparcv9_vis1_instrument_bus(out, cnt);
 118     else
 119         return 0;
 120 }
 121
 122 size_t OPENSSL_instrument_bus2(unsigned int *out, size_t cnt, size_t max)
 123 {
 124     if ((OPENSSL_sparcv9cap_P[0] & (SPARCV9_TICK_PRIVILEGED | SPARCV9_BLK)) ==
 125         SPARCV9_BLK)
 126         return _sparcv9_vis1_instrument_bus2(out, cnt, max);
 127     else
 128         return 0;
 129 }
 130
 131 static sigjmp_buf common_jmp;
 132 static void common_handler(int sig)
 133 {
 134     siglongjmp(common_jmp, sig);
 135 }
 136
 137 #if defined(__sun) && defined(__SVR4)
 138 # if defined(__GNUC__) && __GNUC__>=2
 139 extern unsigned int getisax(unsigned int vec[], unsigned int sz) __attribute__ ((weak));
 140 # elif defined(__SUNPRO_C)
 141 #pragma weak getisax
 142 extern unsigned int getisax(unsigned int vec[], unsigned int sz);
 143 # else
 144 static unsigned int (*getisax) (unsigned int vec[], unsigned int sz) = NULL;
 145 # endif
 146 #endif
 147
 148 void OPENSSL_cpuid_setup(void)
 149 {
 150     char *e;
 151     struct sigaction common_act, ill_oact, bus_oact;
 152     sigset_t all_masked, oset;
 153     static int trigger = 0;
 154
 155     if (trigger)
 156         return;
 157     trigger = 1;
 158
 159     if ((e = getenv("OPENSSL_sparcv9cap"))) {
 160         OPENSSL_sparcv9cap_P[0] = strtoul(e, NULL, 0);
 161         if ((e = strchr(e, ':')))
 162             OPENSSL_sparcv9cap_P[1] = strtoul(e + 1, NULL, 0);
 163         return;
 164     }
 165
 166 #if defined(__sun) && defined(__SVR4)
 167     if (getisax != NULL) {
 168         unsigned int vec[2] = { 0, 0 };
 169
 170         if (getisax (vec,2)) {
 171             if (vec[0]&0x00020) OPENSSL_sparcv9cap_P[0] |= SPARCV9_VIS1;
 172             if (vec[0]&0x00040) OPENSSL_sparcv9cap_P[0] |= SPARCV9_VIS2;
 173             if (vec[0]&0x00080) OPENSSL_sparcv9cap_P[0] |= SPARCV9_BLK;
 174             if (vec[0]&0x00100) OPENSSL_sparcv9cap_P[0] |= SPARCV9_FMADD;
 175             if (vec[0]&0x00400) OPENSSL_sparcv9cap_P[0] |= SPARCV9_VIS3;
 176             if (vec[0]&0x01000) OPENSSL_sparcv9cap_P[0] |= SPARCV9_FJHPCACE;
 177             if (vec[0]&0x02000) OPENSSL_sparcv9cap_P[0] |= SPARCV9_FJDESX;
 178             if (vec[0]&0x08000) OPENSSL_sparcv9cap_P[0] |= SPARCV9_IMA;
 179             if (vec[0]&0x10000) OPENSSL_sparcv9cap_P[0] |= SPARCV9_FJAESX;
 180             if (vec[1]&0x00008) OPENSSL_sparcv9cap_P[0] |= SPARCV9_VIS4;
 181
 182             /* reconstruct %cfr copy */
 183             OPENSSL_sparcv9cap_P[1] = (vec[0]>>17)&0x3ff;
 184             OPENSSL_sparcv9cap_P[1] |= (OPENSSL_sparcv9cap_P[1]&CFR_MONTMUL)<<1;
 185             if (vec[0]&0x20000000) OPENSSL_sparcv9cap_P[1] |= CFR_CRC32C;
 186             if (vec[1]&0x00000020) OPENSSL_sparcv9cap_P[1] |= CFR_XMPMUL;
 187             if (vec[1]&0x00000040)
 188                 OPENSSL_sparcv9cap_P[1] |= CFR_XMONTMUL|CFR_XMONTSQR;
 189
 190             /* Some heuristics */
 191             /* all known VIS2-capable CPUs have unprivileged tick counter */
 192             if (OPENSSL_sparcv9cap_P[0]&SPARCV9_VIS2)
 193                 OPENSSL_sparcv9cap_P[0] &= ~SPARCV9_TICK_PRIVILEGED;
 194
 195             OPENSSL_sparcv9cap_P[0] |= SPARCV9_PREFER_FPU;
 196
 197             /* detect UltraSPARC-Tx, see sparccpud.S for details... */
 198             if ((OPENSSL_sparcv9cap_P[0]&SPARCV9_VIS1) &&
 199                 _sparcv9_vis1_instrument() >= 12)
 200                 OPENSSL_sparcv9cap_P[0] &= ~(SPARCV9_VIS1 | SPARCV9_PREFER_FPU);
 201         }
 202
 203         if (sizeof(size_t) == 8)
 204             OPENSSL_sparcv9cap_P[0] |= SPARCV9_64BIT_STACK;
 205
 206         return;
 207     }
 208 #endif
 209
 210     /* Initial value, fits UltraSPARC-I&II... */
 211     OPENSSL_sparcv9cap_P[0] = SPARCV9_PREFER_FPU | SPARCV9_TICK_PRIVILEGED;
 212
 213     sigfillset(&all_masked);
 214     sigdelset(&all_masked, SIGILL);
 215     sigdelset(&all_masked, SIGTRAP);
 216 # ifdef SIGEMT
 217     sigdelset(&all_masked, SIGEMT);
 218 # endif
 219     sigdelset(&all_masked, SIGFPE);
 220     sigdelset(&all_masked, SIGBUS);
 221     sigdelset(&all_masked, SIGSEGV);
 222     sigprocmask(SIG_SETMASK, &all_masked, &oset);
 223
 224     memset(&common_act, 0, sizeof(common_act));
 225     common_act.sa_handler = common_handler;
 226     common_act.sa_mask = all_masked;
 227
 228     sigaction(SIGILL, &common_act, &ill_oact);
 229     sigaction(SIGBUS, &common_act, &bus_oact); /* T1 fails 16-bit ldda [on
 230                                                 * Linux] */
 231
 232     if (sigsetjmp(common_jmp, 1) == 0) {
 233         _sparcv9_rdtick();
 234         OPENSSL_sparcv9cap_P[0] &= ~SPARCV9_TICK_PRIVILEGED;
 235     }
 236
 237     if (sigsetjmp(common_jmp, 1) == 0) {
 238         _sparcv9_vis1_probe();
 239         OPENSSL_sparcv9cap_P[0] |= SPARCV9_VIS1 | SPARCV9_BLK;
 240         /* detect UltraSPARC-Tx, see sparccpud.S for details... */
 241         if (_sparcv9_vis1_instrument() >= 12)
 242             OPENSSL_sparcv9cap_P[0] &= ~(SPARCV9_VIS1 | SPARCV9_PREFER_FPU);
 243         else {
 244             _sparcv9_vis2_probe();
 245             OPENSSL_sparcv9cap_P[0] |= SPARCV9_VIS2;
 246         }
 247     }
 248
 249     if (sigsetjmp(common_jmp, 1) == 0) {
 250         _sparcv9_fmadd_probe();
 251         OPENSSL_sparcv9cap_P[0] |= SPARCV9_FMADD;
 252     }
 253
 254     /*
 255      * VIS3 flag is tested independently from VIS1, unlike VIS2 that is,
 256      * because VIS3 defines even integer instructions.
 257      */
 258     if (sigsetjmp(common_jmp, 1) == 0) {
 259         _sparcv9_vis3_probe();
 260         OPENSSL_sparcv9cap_P[0] |= SPARCV9_VIS3;
 261     }
 262
 263     if (sigsetjmp(common_jmp, 1) == 0) {
 264         _sparcv9_fjaesx_probe();
 265         OPENSSL_sparcv9cap_P[0] |= SPARCV9_FJAESX;
 266     }
 267
 268     /*
 269      * In wait for better solution _sparcv9_rdcfr is masked by
 270      * VIS3 flag, because it goes to uninterruptable endless
 271      * loop on UltraSPARC II running Solaris. Things might be
 272      * different on Linux...
 273      */
 274     if ((OPENSSL_sparcv9cap_P[0] & SPARCV9_VIS3) &&
 275         sigsetjmp(common_jmp, 1) == 0) {
 276         OPENSSL_sparcv9cap_P[1] = (unsigned int)_sparcv9_rdcfr();
 277     }
 278
 279     sigaction(SIGBUS, &bus_oact, NULL);
 280     sigaction(SIGILL, &ill_oact, NULL);
 281
 282     sigprocmask(SIG_SETMASK, &oset, NULL);
 283
 284     if (sizeof(size_t) == 8)
 285         OPENSSL_sparcv9cap_P[0] |= SPARCV9_64BIT_STACK;
 286 # ifdef __linux
 287     else {
 288         int ret = syscall(340);
 289
 290         if (ret >= 0 && ret & 1)
 291             OPENSSL_sparcv9cap_P[0] |= SPARCV9_64BIT_STACK;
 292     }
 293 # endif
 294 }