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 unsigned long _sparcv9_random(void);
  97 size_t _sparcv9_vis1_instrument_bus(unsigned int *, size_t);
  98 size_t _sparcv9_vis1_instrument_bus2(unsigned int *, size_t, size_t);
  99
 100 unsigned long OPENSSL_rdtsc(void)
 101 {
 102     if (OPENSSL_sparcv9cap_P[0] & SPARCV9_TICK_PRIVILEGED)
 103 #if defined(__sun) && defined(__SVR4)
 104         return gethrtime();
 105 #else
 106         return 0;
 107 #endif
 108     else
 109         return _sparcv9_rdtick();
 110 }
 111
 112 size_t OPENSSL_instrument_bus(unsigned int *out, size_t cnt)
 113 {
 114     if ((OPENSSL_sparcv9cap_P[0] & (SPARCV9_TICK_PRIVILEGED | SPARCV9_BLK)) ==
 115         SPARCV9_BLK)
 116         return _sparcv9_vis1_instrument_bus(out, cnt);
 117     else
 118         return 0;
 119 }
 120
 121 size_t OPENSSL_instrument_bus2(unsigned int *out, size_t cnt, size_t max)
 122 {
 123     if ((OPENSSL_sparcv9cap_P[0] & (SPARCV9_TICK_PRIVILEGED | SPARCV9_BLK)) ==
 124         SPARCV9_BLK)
 125         return _sparcv9_vis1_instrument_bus2(out, cnt, max);
 126     else
 127         return 0;
 128 }
 129
 130 static sigjmp_buf common_jmp;
 131 static void common_handler(int sig)
 132 {
 133     siglongjmp(common_jmp, sig);
 134 }
 135
 136 #if defined(__sun) && defined(__SVR4)
 137 # if defined(__GNUC__) && __GNUC__>=2
 138 extern unsigned int getisax(unsigned int vec[], unsigned int sz) __attribute__ ((weak));
 139 # elif defined(__SUNPRO_C)
 140 #pragma weak getisax
 141 extern unsigned int getisax(unsigned int vec[], unsigned int sz);
 142 # else
 143 static unsigned int (*getisax) (unsigned int vec[], unsigned int sz) = NULL;
 144 # endif
 145 #endif
 146
 147 void OPENSSL_cpuid_setup(void)
 148 {
 149     char *e;
 150     struct sigaction common_act, ill_oact, bus_oact;
 151     sigset_t all_masked, oset;
 152     static int trigger = 0;
 153
 154     if (trigger)
 155         return;
 156     trigger = 1;
 157
 158     if ((e = getenv("OPENSSL_sparcv9cap"))) {
 159         OPENSSL_sparcv9cap_P[0] = strtoul(e, NULL, 0);
 160         if ((e = strchr(e, ':')))
 161             OPENSSL_sparcv9cap_P[1] = strtoul(e + 1, NULL, 0);
 162         return;
 163     }
 164
 165 #if defined(__sun) && defined(__SVR4)
 166     if (getisax != NULL) {
 167         unsigned int vec[1];
 168
 169         if (getisax (vec,1)) {
 170             if (vec[0]&0x00020) OPENSSL_sparcv9cap_P[0] |= SPARCV9_VIS1;
 171             if (vec[0]&0x00040) OPENSSL_sparcv9cap_P[0] |= SPARCV9_VIS2;
 172             if (vec[0]&0x00080) OPENSSL_sparcv9cap_P[0] |= SPARCV9_BLK;
 173             if (vec[0]&0x00100) OPENSSL_sparcv9cap_P[0] |= SPARCV9_FMADD;
 174             if (vec[0]&0x00400) OPENSSL_sparcv9cap_P[0] |= SPARCV9_VIS3;
 175             if (vec[0]&0x01000) OPENSSL_sparcv9cap_P[0] |= SPARCV9_FJHPCACE;
 176             if (vec[0]&0x02000) OPENSSL_sparcv9cap_P[0] |= SPARCV9_FJDESX;
 177             if (vec[0]&0x08000) OPENSSL_sparcv9cap_P[0] |= SPARCV9_IMA;
 178             if (vec[0]&0x10000) OPENSSL_sparcv9cap_P[0] |= SPARCV9_FJAESX;
 179             if (vec[1]&0x00008) OPENSSL_sparcv9cap_P[0] |= SPARCV9_VIS4;
 180
 181             /* reconstruct %cfr copy */
 182             OPENSSL_sparcv9cap_P[1] = (vec[0]>>17)&0x3ff;
 183             OPENSSL_sparcv9cap_P[1] |= (OPENSSL_sparcv9cap_P[1]&CFR_MONTMUL)<<1;
 184             if (vec[0]&0x20000000) OPENSSL_sparcv9cap_P[1] |= CFR_CRC32C;
 185             if (vec[1]&0x00000020) OPENSSL_sparcv9cap_P[1] |= CFR_XMPMUL;
 186             if (vec[1]&0x00000040)
 187                 OPENSSL_sparcv9cap_P[1] |= CFR_XMONTMUL|CFR_XMONTSQR;
 188
 189             /* Some heuristics */
 190             /* all known VIS2-capable CPUs have unprivileged tick counter */
 191             if (OPENSSL_sparcv9cap_P[0]&SPARCV9_VIS2)
 192                 OPENSSL_sparcv9cap_P[0] &= ~SPARCV9_TICK_PRIVILEGED;
 193
 194             OPENSSL_sparcv9cap_P[0] |= SPARCV9_PREFER_FPU;
 195
 196             /* detect UltraSPARC-Tx, see sparccpud.S for details... */
 197             if ((OPENSSL_sparcv9cap_P[0]&SPARCV9_VIS1) &&
 198                 _sparcv9_vis1_instrument() >= 12)
 199                 OPENSSL_sparcv9cap_P[0] &= ~(SPARCV9_VIS1 | SPARCV9_PREFER_FPU);
 200         }
 201
 202         if (sizeof(size_t) == 8)
 203             OPENSSL_sparcv9cap_P[0] |= SPARCV9_64BIT_STACK;
 204
 205         return;
 206     }
 207 #endif
 208
 209     /* Initial value, fits UltraSPARC-I&II... */
 210     OPENSSL_sparcv9cap_P[0] = SPARCV9_PREFER_FPU | SPARCV9_TICK_PRIVILEGED;
 211
 212     sigfillset(&all_masked);
 213     sigdelset(&all_masked, SIGILL);
 214     sigdelset(&all_masked, SIGTRAP);
 215 # ifdef SIGEMT
 216     sigdelset(&all_masked, SIGEMT);
 217 # endif
 218     sigdelset(&all_masked, SIGFPE);
 219     sigdelset(&all_masked, SIGBUS);
 220     sigdelset(&all_masked, SIGSEGV);
 221     sigprocmask(SIG_SETMASK, &all_masked, &oset);
 222
 223     memset(&common_act, 0, sizeof(common_act));
 224     common_act.sa_handler = common_handler;
 225     common_act.sa_mask = all_masked;
 226
 227     sigaction(SIGILL, &common_act, &ill_oact);
 228     sigaction(SIGBUS, &common_act, &bus_oact); /* T1 fails 16-bit ldda [on
 229                                                 * Linux] */
 230
 231     if (sigsetjmp(common_jmp, 1) == 0) {
 232         _sparcv9_rdtick();
 233         OPENSSL_sparcv9cap_P[0] &= ~SPARCV9_TICK_PRIVILEGED;
 234     }
 235
 236     if (sigsetjmp(common_jmp, 1) == 0) {
 237         _sparcv9_vis1_probe();
 238         OPENSSL_sparcv9cap_P[0] |= SPARCV9_VIS1 | SPARCV9_BLK;
 239         /* detect UltraSPARC-Tx, see sparccpud.S for details... */
 240         if (_sparcv9_vis1_instrument() >= 12)
 241             OPENSSL_sparcv9cap_P[0] &= ~(SPARCV9_VIS1 | SPARCV9_PREFER_FPU);
 242         else {
 243             _sparcv9_vis2_probe();
 244             OPENSSL_sparcv9cap_P[0] |= SPARCV9_VIS2;
 245         }
 246     }
 247
 248     if (sigsetjmp(common_jmp, 1) == 0) {
 249         _sparcv9_fmadd_probe();
 250         OPENSSL_sparcv9cap_P[0] |= SPARCV9_FMADD;
 251     }
 252
 253     /*
 254      * VIS3 flag is tested independently from VIS1, unlike VIS2 that is,
 255      * because VIS3 defines even integer instructions.
 256      */
 257     if (sigsetjmp(common_jmp, 1) == 0) {
 258         _sparcv9_vis3_probe();
 259         OPENSSL_sparcv9cap_P[0] |= SPARCV9_VIS3;
 260     }
 261
 262     if (sigsetjmp(common_jmp, 1) == 0) {
 263         _sparcv9_fjaesx_probe();
 264         OPENSSL_sparcv9cap_P[0] |= SPARCV9_FJAESX;
 265     }
 266
 267     /*
 268      * In wait for better solution _sparcv9_rdcfr is masked by
 269      * VIS3 flag, because it goes to uninterruptable endless
 270      * loop on UltraSPARC II running Solaris. Things might be
 271      * different on Linux...
 272      */
 273     if ((OPENSSL_sparcv9cap_P[0] & SPARCV9_VIS3) &&
 274         sigsetjmp(common_jmp, 1) == 0) {
 275         OPENSSL_sparcv9cap_P[1] = (unsigned int)_sparcv9_rdcfr();
 276     }
 277
 278     sigaction(SIGBUS, &bus_oact, NULL);
 279     sigaction(SIGILL, &ill_oact, NULL);
 280
 281     sigprocmask(SIG_SETMASK, &oset, NULL);
 282
 283     if (sizeof(size_t) == 8)
 284         OPENSSL_sparcv9cap_P[0] |= SPARCV9_64BIT_STACK;
 285 # ifdef __linux
 286     else {
 287         int ret = syscall(340);
 288
 289         if (ret >= 0 && ret & 1)
 290             OPENSSL_sparcv9cap_P[0] |= SPARCV9_64BIT_STACK;
 291     }
 292 # endif
 293 }