crypto/sparcv9cap.c

   1 /*
   2  * Copyright 2005-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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 #include "internal/cryptlib.h"
  19
  20 #include "sparc_arch.h"
  21
  22 #if defined(__GNUC__) && defined(__linux)
  23 __attribute__ ((visibility("hidden")))
  24 #endif
  25 unsigned int OPENSSL_sparcv9cap_P[2] = { SPARCV9_TICK_PRIVILEGED, 0 };
  26
  27 /*
  28  * TODO(3.0): Temporarily disabled some assembler that hasn't been brought into
  29  * the FIPS module yet.
  30  */
  31 #ifndef FIPS_MODE
  32 int bn_mul_mont(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,
  33                 const BN_ULONG *np, const BN_ULONG *n0, int num)
  34 {
  35     int bn_mul_mont_vis3(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,
  36                          const BN_ULONG *np, const BN_ULONG *n0, int num);
  37     int bn_mul_mont_fpu(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,
  38                         const BN_ULONG *np, const BN_ULONG *n0, int num);
  39     int bn_mul_mont_int(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,
  40                         const BN_ULONG *np, const BN_ULONG *n0, int num);
  41
  42     if (!(num & 1) && num >= 6) {
  43         if ((num & 15) == 0 && num <= 64 &&
  44             (OPENSSL_sparcv9cap_P[1] & (CFR_MONTMUL | CFR_MONTSQR)) ==
  45             (CFR_MONTMUL | CFR_MONTSQR)) {
  46             typedef int (*bn_mul_mont_f) (BN_ULONG *rp, const BN_ULONG *ap,
  47                                           const BN_ULONG *bp,
  48                                           const BN_ULONG *np,
  49                                           const BN_ULONG *n0);
  50             int bn_mul_mont_t4_8(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_16(BN_ULONG *rp, const BN_ULONG *ap,
  54                                   const BN_ULONG *bp, const BN_ULONG *np,
  55                                   const BN_ULONG *n0);
  56             int bn_mul_mont_t4_24(BN_ULONG *rp, const BN_ULONG *ap,
  57                                   const BN_ULONG *bp, const BN_ULONG *np,
  58                                   const BN_ULONG *n0);
  59             int bn_mul_mont_t4_32(BN_ULONG *rp, const BN_ULONG *ap,
  60                                   const BN_ULONG *bp, const BN_ULONG *np,
  61                                   const BN_ULONG *n0);
  62             static const bn_mul_mont_f funcs[4] = {
  63                 bn_mul_mont_t4_8, bn_mul_mont_t4_16,
  64                 bn_mul_mont_t4_24, bn_mul_mont_t4_32
  65             };
  66             bn_mul_mont_f worker = funcs[num / 16 - 1];
  67
  68             if ((*worker) (rp, ap, bp, np, n0))
  69                 return 1;
  70             /* retry once and fall back */
  71             if ((*worker) (rp, ap, bp, np, n0))
  72                 return 1;
  73             return bn_mul_mont_vis3(rp, ap, bp, np, n0, num);
  74         }
  75         if ((OPENSSL_sparcv9cap_P[0] & SPARCV9_VIS3))
  76             return bn_mul_mont_vis3(rp, ap, bp, np, n0, num);
  77         else if (num >= 8 &&
  78                  /*
  79                   * bn_mul_mont_fpu doesn't use FMADD, we just use the
  80                   * flag to detect when FPU path is preferable in cases
  81                   * when current heuristics is unreliable. [it works
  82                   * out because FMADD-capable processors where FPU
  83                   * code path is undesirable are also VIS3-capable and
  84                   * VIS3 code path takes precedence.]
  85                   */
  86                  ( (OPENSSL_sparcv9cap_P[0] & SPARCV9_FMADD) ||
  87                    (OPENSSL_sparcv9cap_P[0] &
  88                     (SPARCV9_PREFER_FPU | SPARCV9_VIS1)) ==
  89                    (SPARCV9_PREFER_FPU | SPARCV9_VIS1) ))
  90             return bn_mul_mont_fpu(rp, ap, bp, np, n0, num);
  91     }
  92     return bn_mul_mont_int(rp, ap, bp, np, n0, num);
  93 }
  94 #endif /* FIPS_MODE */
  95
  96 unsigned long _sparcv9_rdtick(void);
  97 void _sparcv9_vis1_probe(void);
  98 unsigned long _sparcv9_vis1_instrument(void);
  99 void _sparcv9_vis2_probe(void);
 100 void _sparcv9_fmadd_probe(void);
 101 unsigned long _sparcv9_rdcfr(void);
 102 void _sparcv9_vis3_probe(void);
 103 void _sparcv9_fjaesx_probe(void);
 104 unsigned long _sparcv9_random(void);
 105 size_t _sparcv9_vis1_instrument_bus(unsigned int *, size_t);
 106 size_t _sparcv9_vis1_instrument_bus2(unsigned int *, size_t, size_t);
 107
 108 uint32_t OPENSSL_rdtsc(void)
 109 {
 110     if (OPENSSL_sparcv9cap_P[0] & SPARCV9_TICK_PRIVILEGED)
 111 #if defined(__sun) && defined(__SVR4)
 112         return gethrtime();
 113 #else
 114         return 0;
 115 #endif
 116     else
 117         return _sparcv9_rdtick();
 118 }
 119
 120 size_t OPENSSL_instrument_bus(unsigned int *out, size_t cnt)
 121 {
 122     if ((OPENSSL_sparcv9cap_P[0] & (SPARCV9_TICK_PRIVILEGED | SPARCV9_BLK)) ==
 123         SPARCV9_BLK)
 124         return _sparcv9_vis1_instrument_bus(out, cnt);
 125     else
 126         return 0;
 127 }
 128
 129 size_t OPENSSL_instrument_bus2(unsigned int *out, size_t cnt, size_t max)
 130 {
 131     if ((OPENSSL_sparcv9cap_P[0] & (SPARCV9_TICK_PRIVILEGED | SPARCV9_BLK)) ==
 132         SPARCV9_BLK)
 133         return _sparcv9_vis1_instrument_bus2(out, cnt, max);
 134     else
 135         return 0;
 136 }
 137
 138 static sigjmp_buf common_jmp;
 139 static void common_handler(int sig)
 140 {
 141     siglongjmp(common_jmp, sig);
 142 }
 143
 144 #if defined(__sun) && defined(__SVR4)
 145 # if defined(__GNUC__) && __GNUC__>=2
 146 extern unsigned int getisax(unsigned int vec[], unsigned int sz) __attribute__ ((weak));
 147 # elif defined(__SUNPRO_C)
 148 #pragma weak getisax
 149 extern unsigned int getisax(unsigned int vec[], unsigned int sz);
 150 # else
 151 static unsigned int (*getisax) (unsigned int vec[], unsigned int sz) = NULL;
 152 # endif
 153 #endif
 154
 155 void OPENSSL_cpuid_setup(void)
 156 {
 157     char *e;
 158     struct sigaction common_act, ill_oact, bus_oact;
 159     sigset_t all_masked, oset;
 160     static int trigger = 0;
 161
 162     if (trigger)
 163         return;
 164     trigger = 1;
 165
 166     if ((e = getenv("OPENSSL_sparcv9cap"))) {
 167         OPENSSL_sparcv9cap_P[0] = strtoul(e, NULL, 0);
 168         if ((e = strchr(e, ':')))
 169             OPENSSL_sparcv9cap_P[1] = strtoul(e + 1, NULL, 0);
 170         return;
 171     }
 172
 173 #if defined(__sun) && defined(__SVR4)
 174     if (getisax != NULL) {
 175         unsigned int vec[2] = { 0, 0 };
 176
 177         if (getisax (vec,2)) {
 178             if (vec[0]&0x00020) OPENSSL_sparcv9cap_P[0] |= SPARCV9_VIS1;
 179             if (vec[0]&0x00040) OPENSSL_sparcv9cap_P[0] |= SPARCV9_VIS2;
 180             if (vec[0]&0x00080) OPENSSL_sparcv9cap_P[0] |= SPARCV9_BLK;
 181             if (vec[0]&0x00100) OPENSSL_sparcv9cap_P[0] |= SPARCV9_FMADD;
 182             if (vec[0]&0x00400) OPENSSL_sparcv9cap_P[0] |= SPARCV9_VIS3;
 183             if (vec[0]&0x01000) OPENSSL_sparcv9cap_P[0] |= SPARCV9_FJHPCACE;
 184             if (vec[0]&0x02000) OPENSSL_sparcv9cap_P[0] |= SPARCV9_FJDESX;
 185             if (vec[0]&0x08000) OPENSSL_sparcv9cap_P[0] |= SPARCV9_IMA;
 186             if (vec[0]&0x10000) OPENSSL_sparcv9cap_P[0] |= SPARCV9_FJAESX;
 187             if (vec[1]&0x00008) OPENSSL_sparcv9cap_P[0] |= SPARCV9_VIS4;
 188
 189             /* reconstruct %cfr copy */
 190             OPENSSL_sparcv9cap_P[1] = (vec[0]>>17)&0x3ff;
 191             OPENSSL_sparcv9cap_P[1] |= (OPENSSL_sparcv9cap_P[1]&CFR_MONTMUL)<<1;
 192             if (vec[0]&0x20000000) OPENSSL_sparcv9cap_P[1] |= CFR_CRC32C;
 193             if (vec[1]&0x00000020) OPENSSL_sparcv9cap_P[1] |= CFR_XMPMUL;
 194             if (vec[1]&0x00000040)
 195                 OPENSSL_sparcv9cap_P[1] |= CFR_XMONTMUL|CFR_XMONTSQR;
 196
 197             /* Some heuristics */
 198             /* all known VIS2-capable CPUs have unprivileged tick counter */
 199             if (OPENSSL_sparcv9cap_P[0]&SPARCV9_VIS2)
 200                 OPENSSL_sparcv9cap_P[0] &= ~SPARCV9_TICK_PRIVILEGED;
 201
 202             OPENSSL_sparcv9cap_P[0] |= SPARCV9_PREFER_FPU;
 203
 204             /* detect UltraSPARC-Tx, see sparccpud.S for details... */
 205             if ((OPENSSL_sparcv9cap_P[0]&SPARCV9_VIS1) &&
 206                 _sparcv9_vis1_instrument() >= 12)
 207                 OPENSSL_sparcv9cap_P[0] &= ~(SPARCV9_VIS1 | SPARCV9_PREFER_FPU);
 208         }
 209
 210         if (sizeof(size_t) == 8)
 211             OPENSSL_sparcv9cap_P[0] |= SPARCV9_64BIT_STACK;
 212
 213         return;
 214     }
 215 #endif
 216
 217     /* Initial value, fits UltraSPARC-I&II... */
 218     OPENSSL_sparcv9cap_P[0] = SPARCV9_PREFER_FPU | SPARCV9_TICK_PRIVILEGED;
 219
 220     sigfillset(&all_masked);
 221     sigdelset(&all_masked, SIGILL);
 222     sigdelset(&all_masked, SIGTRAP);
 223 # ifdef SIGEMT
 224     sigdelset(&all_masked, SIGEMT);
 225 # endif
 226     sigdelset(&all_masked, SIGFPE);
 227     sigdelset(&all_masked, SIGBUS);
 228     sigdelset(&all_masked, SIGSEGV);
 229     sigprocmask(SIG_SETMASK, &all_masked, &oset);
 230
 231     memset(&common_act, 0, sizeof(common_act));
 232     common_act.sa_handler = common_handler;
 233     common_act.sa_mask = all_masked;
 234
 235     sigaction(SIGILL, &common_act, &ill_oact);
 236     sigaction(SIGBUS, &common_act, &bus_oact); /* T1 fails 16-bit ldda [on
 237                                                 * Linux] */
 238
 239     if (sigsetjmp(common_jmp, 1) == 0) {
 240         _sparcv9_rdtick();
 241         OPENSSL_sparcv9cap_P[0] &= ~SPARCV9_TICK_PRIVILEGED;
 242     }
 243
 244     if (sigsetjmp(common_jmp, 1) == 0) {
 245         _sparcv9_vis1_probe();
 246         OPENSSL_sparcv9cap_P[0] |= SPARCV9_VIS1 | SPARCV9_BLK;
 247         /* detect UltraSPARC-Tx, see sparccpud.S for details... */
 248         if (_sparcv9_vis1_instrument() >= 12)
 249             OPENSSL_sparcv9cap_P[0] &= ~(SPARCV9_VIS1 | SPARCV9_PREFER_FPU);
 250         else {
 251             _sparcv9_vis2_probe();
 252             OPENSSL_sparcv9cap_P[0] |= SPARCV9_VIS2;
 253         }
 254     }
 255
 256     if (sigsetjmp(common_jmp, 1) == 0) {
 257         _sparcv9_fmadd_probe();
 258         OPENSSL_sparcv9cap_P[0] |= SPARCV9_FMADD;
 259     }
 260
 261     /*
 262      * VIS3 flag is tested independently from VIS1, unlike VIS2 that is,
 263      * because VIS3 defines even integer instructions.
 264      */
 265     if (sigsetjmp(common_jmp, 1) == 0) {
 266         _sparcv9_vis3_probe();
 267         OPENSSL_sparcv9cap_P[0] |= SPARCV9_VIS3;
 268     }
 269
 270     if (sigsetjmp(common_jmp, 1) == 0) {
 271         _sparcv9_fjaesx_probe();
 272         OPENSSL_sparcv9cap_P[0] |= SPARCV9_FJAESX;
 273     }
 274
 275     /*
 276      * In wait for better solution _sparcv9_rdcfr is masked by
 277      * VIS3 flag, because it goes to uninterruptable endless
 278      * loop on UltraSPARC II running Solaris. Things might be
 279      * different on Linux...
 280      */
 281     if ((OPENSSL_sparcv9cap_P[0] & SPARCV9_VIS3) &&
 282         sigsetjmp(common_jmp, 1) == 0) {
 283         OPENSSL_sparcv9cap_P[1] = (unsigned int)_sparcv9_rdcfr();
 284     }
 285
 286     sigaction(SIGBUS, &bus_oact, NULL);
 287     sigaction(SIGILL, &ill_oact, NULL);
 288
 289     sigprocmask(SIG_SETMASK, &oset, NULL);
 290
 291     if (sizeof(size_t) == 8)
 292         OPENSSL_sparcv9cap_P[0] |= SPARCV9_64BIT_STACK;
 293 # ifdef __linux
 294     else {
 295         int ret = syscall(340);
 296
 297         if (ret >= 0 && ret & 1)
 298             OPENSSL_sparcv9cap_P[0] |= SPARCV9_64BIT_STACK;
 299     }
 300 # endif
 301 }