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