crypto/ppccap.c

   1 /*
   2  * Copyright 2009-2016 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 <unistd.h>
  16 #if defined(__linux) || defined(_AIX)
  17 # include <sys/utsname.h>
  18 #endif
  19 #if defined(_AIX53)     /* defined even on post-5.3 */
  20 # include <sys/systemcfg.h>
  21 # if !defined(__power_set)
  22 #  define __power_set(a) (_system_configuration.implementation & (a))
  23 # endif
  24 #endif
  25 #if defined(__APPLE__) && defined(__MACH__)
  26 # include <sys/types.h>
  27 # include <sys/sysctl.h>
  28 #endif
  29 #include <openssl/crypto.h>
  30 #include <openssl/bn.h>
  31
  32 #include "ppc_arch.h"
  33
  34 unsigned int OPENSSL_ppccap_P = 0;
  35
  36 static sigset_t all_masked;
  37
  38 #ifdef OPENSSL_BN_ASM_MONT
  39 int bn_mul_mont(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,
  40                 const BN_ULONG *np, const BN_ULONG *n0, int num)
  41 {
  42     int bn_mul_mont_int(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,
  43                         const BN_ULONG *np, const BN_ULONG *n0, int num);
  44     int bn_mul4x_mont_int(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,
  45                           const BN_ULONG *np, const BN_ULONG *n0, int num);
  46
  47     if (num < 4)
  48         return 0;
  49
  50     if ((num & 3) == 0)
  51         return bn_mul4x_mont_int(rp, ap, bp, np, n0, num);
  52
  53     /*
  54      * There used to be [optional] call to bn_mul_mont_fpu64 here,
  55      * but above subroutine is faster on contemporary processors.
  56      * Formulation means that there might be old processors where
  57      * FPU code path would be faster, POWER6 perhaps, but there was
  58      * no opportunity to figure it out...
  59      */
  60
  61     return bn_mul_mont_int(rp, ap, bp, np, n0, num);
  62 }
  63 #endif
  64
  65 void sha256_block_p8(void *ctx, const void *inp, size_t len);
  66 void sha256_block_ppc(void *ctx, const void *inp, size_t len);
  67 void sha256_block_data_order(void *ctx, const void *inp, size_t len)
  68 {
  69     OPENSSL_ppccap_P & PPC_CRYPTO207 ? sha256_block_p8(ctx, inp, len) :
  70         sha256_block_ppc(ctx, inp, len);
  71 }
  72
  73 void sha512_block_p8(void *ctx, const void *inp, size_t len);
  74 void sha512_block_ppc(void *ctx, const void *inp, size_t len);
  75 void sha512_block_data_order(void *ctx, const void *inp, size_t len)
  76 {
  77     OPENSSL_ppccap_P & PPC_CRYPTO207 ? sha512_block_p8(ctx, inp, len) :
  78         sha512_block_ppc(ctx, inp, len);
  79 }
  80
  81 #ifndef OPENSSL_NO_CHACHA
  82 void ChaCha20_ctr32_int(unsigned char *out, const unsigned char *inp,
  83                         size_t len, const unsigned int key[8],
  84                         const unsigned int counter[4]);
  85 void ChaCha20_ctr32_vmx(unsigned char *out, const unsigned char *inp,
  86                         size_t len, const unsigned int key[8],
  87                         const unsigned int counter[4]);
  88 void ChaCha20_ctr32(unsigned char *out, const unsigned char *inp,
  89                     size_t len, const unsigned int key[8],
  90                     const unsigned int counter[4])
  91 {
  92     OPENSSL_ppccap_P & PPC_ALTIVEC
  93         ? ChaCha20_ctr32_vmx(out, inp, len, key, counter)
  94         : ChaCha20_ctr32_int(out, inp, len, key, counter);
  95 }
  96 #endif
  97
  98 #ifndef OPENSSL_NO_POLY1305
  99 void poly1305_init_int(void *ctx, const unsigned char key[16]);
 100 void poly1305_blocks(void *ctx, const unsigned char *inp, size_t len,
 101                          unsigned int padbit);
 102 void poly1305_emit(void *ctx, unsigned char mac[16],
 103                        const unsigned int nonce[4]);
 104 void poly1305_init_fpu(void *ctx, const unsigned char key[16]);
 105 void poly1305_blocks_fpu(void *ctx, const unsigned char *inp, size_t len,
 106                          unsigned int padbit);
 107 void poly1305_emit_fpu(void *ctx, unsigned char mac[16],
 108                        const unsigned int nonce[4]);
 109 int poly1305_init(void *ctx, const unsigned char key[16], void *func[2])
 110 {
 111     if (sizeof(size_t) == 4 && (OPENSSL_ppccap_P & PPC_FPU)) {
 112         poly1305_init_fpu(ctx, key);
 113         func[0] = poly1305_blocks_fpu;
 114         func[1] = poly1305_emit_fpu;
 115     } else {
 116         poly1305_init_int(ctx, key);
 117         func[0] = poly1305_blocks;
 118         func[1] = poly1305_emit;
 119     }
 120     return 1;
 121 }
 122 #endif
 123
 124 #ifdef ECP_NISTZ256_ASM
 125 void ecp_nistz256_mul_mont(unsigned long res[4], const unsigned long a[4],
 126                            const unsigned long b[4]);
 127
 128 void ecp_nistz256_to_mont(unsigned long res[4], const unsigned long in[4]);
 129 void ecp_nistz256_to_mont(unsigned long res[4], const unsigned long in[4])
 130 {
 131     static const unsigned long RR[] = { 0x0000000000000003U,
 132                                         0xfffffffbffffffffU,
 133                                         0xfffffffffffffffeU,
 134                                         0x00000004fffffffdU };
 135
 136     ecp_nistz256_mul_mont(res, in, RR);
 137 }
 138
 139 void ecp_nistz256_from_mont(unsigned long res[4], const unsigned long in[4]);
 140 void ecp_nistz256_from_mont(unsigned long res[4], const unsigned long in[4])
 141 {
 142     static const unsigned long one[] = { 1, 0, 0, 0 };
 143
 144     ecp_nistz256_mul_mont(res, in, one);
 145 }
 146 #endif
 147
 148 static sigjmp_buf ill_jmp;
 149 static void ill_handler(int sig)
 150 {
 151     siglongjmp(ill_jmp, sig);
 152 }
 153
 154 void OPENSSL_fpu_probe(void);
 155 void OPENSSL_ppc64_probe(void);
 156 void OPENSSL_altivec_probe(void);
 157 void OPENSSL_crypto207_probe(void);
 158 void OPENSSL_madd300_probe(void);
 159
 160 /*
 161  * Use a weak reference to getauxval() so we can use it if it is available
 162  * but don't break the build if it is not. Note that this is *link-time*
 163  * feature detection, not *run-time*. In other words if we link with
 164  * symbol present, it's expected to be present even at run-time.
 165  */
 166 #if defined(__GNUC__) && __GNUC__>=2 && defined(__ELF__)
 167 extern unsigned long getauxval(unsigned long type) __attribute__ ((weak));
 168 #else
 169 static unsigned long (*getauxval) (unsigned long) = NULL;
 170 #endif
 171
 172 /* I wish <sys/auxv.h> was universally available */
 173 #define HWCAP                   16      /* AT_HWCAP */
 174 #define HWCAP_PPC64             (1U << 30)
 175 #define HWCAP_ALTIVEC           (1U << 28)
 176 #define HWCAP_FPU               (1U << 27)
 177 #define HWCAP_POWER6_EXT        (1U << 9)
 178 #define HWCAP_VSX               (1U << 7)
 179
 180 #define HWCAP2                  26      /* AT_HWCAP2 */
 181 #define HWCAP_VEC_CRYPTO        (1U << 25)
 182 #define HWCAP_ARCH_3_00         (1U << 23)
 183
 184 # if defined(__GNUC__) && __GNUC__>=2
 185 __attribute__ ((constructor))
 186 # endif
 187 void OPENSSL_cpuid_setup(void)
 188 {
 189     char *e;
 190     struct sigaction ill_oact, ill_act;
 191     sigset_t oset;
 192     static int trigger = 0;
 193
 194     if (trigger)
 195         return;
 196     trigger = 1;
 197
 198     if ((e = getenv("OPENSSL_ppccap"))) {
 199         OPENSSL_ppccap_P = strtoul(e, NULL, 0);
 200         return;
 201     }
 202
 203     OPENSSL_ppccap_P = 0;
 204
 205 #if defined(_AIX)
 206     OPENSSL_ppccap_P |= PPC_FPU;
 207
 208     if (sizeof(size_t) == 4) {
 209         struct utsname uts;
 210 # if defined(_SC_AIX_KERNEL_BITMODE)
 211         if (sysconf(_SC_AIX_KERNEL_BITMODE) != 64)
 212             return;
 213 # endif
 214         if (uname(&uts) != 0 || atoi(uts.version) < 6)
 215             return;
 216     }
 217
 218 # if defined(__power_set)
 219     /*
 220      * Value used in __power_set is a single-bit 1<<n one denoting
 221      * specific processor class. Incidentally 0xffffffff<<n can be
 222      * used to denote specific processor and its successors.
 223      */
 224     if (sizeof(size_t) == 4) {
 225         /* In 32-bit case PPC_FPU64 is always fastest [if option] */
 226         if (__power_set(0xffffffffU<<13))       /* POWER5 and later */
 227             OPENSSL_ppccap_P |= PPC_FPU64;
 228     } else {
 229         /* In 64-bit case PPC_FPU64 is fastest only on POWER6 */
 230         if (__power_set(0x1U<<14))              /* POWER6 */
 231             OPENSSL_ppccap_P |= PPC_FPU64;
 232     }
 233
 234     if (__power_set(0xffffffffU<<14))           /* POWER6 and later */
 235         OPENSSL_ppccap_P |= PPC_ALTIVEC;
 236
 237     if (__power_set(0xffffffffU<<16))           /* POWER8 and later */
 238         OPENSSL_ppccap_P |= PPC_CRYPTO207;
 239
 240     if (__power_set(0xffffffffU<<17))           /* POWER9 and later */
 241         OPENSSL_ppccap_P |= PPC_MADD300;
 242
 243     return;
 244 # endif
 245 #endif
 246
 247 #if defined(__APPLE__) && defined(__MACH__)
 248     OPENSSL_ppccap_P |= PPC_FPU;
 249
 250     {
 251         int val;
 252         size_t len = sizeof(val);
 253
 254         if (sysctlbyname("hw.optional.64bitops", &val, &len, NULL, 0) == 0) {
 255             if (val)
 256                 OPENSSL_ppccap_P |= PPC_FPU64;
 257         }
 258
 259         len = sizeof(val);
 260         if (sysctlbyname("hw.optional.altivec", &val, &len, NULL, 0) == 0) {
 261             if (val)
 262                 OPENSSL_ppccap_P |= PPC_ALTIVEC;
 263         }
 264
 265         return;
 266     }
 267 #endif
 268
 269     if (getauxval != NULL) {
 270         unsigned long hwcap = getauxval(HWCAP);
 271
 272         if (hwcap & HWCAP_FPU) {
 273             OPENSSL_ppccap_P |= PPC_FPU;
 274
 275             if (sizeof(size_t) == 4) {
 276                 /* In 32-bit case PPC_FPU64 is always fastest [if option] */
 277                 if (hwcap & HWCAP_PPC64)
 278                     OPENSSL_ppccap_P |= PPC_FPU64;
 279             } else {
 280                 /* In 64-bit case PPC_FPU64 is fastest only on POWER6 */
 281                 if (hwcap & HWCAP_POWER6_EXT)
 282                     OPENSSL_ppccap_P |= PPC_FPU64;
 283             }
 284         }
 285
 286         if (hwcap & HWCAP_ALTIVEC) {
 287             OPENSSL_ppccap_P |= PPC_ALTIVEC;
 288
 289             if ((hwcap & HWCAP_VSX) && (getauxval(HWCAP2) & HWCAP_VEC_CRYPTO))
 290                 OPENSSL_ppccap_P |= PPC_CRYPTO207;
 291         }
 292
 293         if (hwcap & HWCAP_ARCH_3_00) {
 294             OPENSSL_ppccap_P |= PPC_MADD300;
 295         }
 296
 297         return;
 298     }
 299
 300     sigfillset(&all_masked);
 301     sigdelset(&all_masked, SIGILL);
 302     sigdelset(&all_masked, SIGTRAP);
 303 #ifdef SIGEMT
 304     sigdelset(&all_masked, SIGEMT);
 305 #endif
 306     sigdelset(&all_masked, SIGFPE);
 307     sigdelset(&all_masked, SIGBUS);
 308     sigdelset(&all_masked, SIGSEGV);
 309
 310     memset(&ill_act, 0, sizeof(ill_act));
 311     ill_act.sa_handler = ill_handler;
 312     ill_act.sa_mask = all_masked;
 313
 314     sigprocmask(SIG_SETMASK, &ill_act.sa_mask, &oset);
 315     sigaction(SIGILL, &ill_act, &ill_oact);
 316
 317     if (sigsetjmp(ill_jmp,1) == 0) {
 318         OPENSSL_fpu_probe();
 319         OPENSSL_ppccap_P |= PPC_FPU;
 320
 321         if (sizeof(size_t) == 4) {
 322 #ifdef __linux
 323             struct utsname uts;
 324             if (uname(&uts) == 0 && strcmp(uts.machine, "ppc64") == 0)
 325 #endif
 326                 if (sigsetjmp(ill_jmp, 1) == 0) {
 327                     OPENSSL_ppc64_probe();
 328                     OPENSSL_ppccap_P |= PPC_FPU64;
 329                 }
 330         } else {
 331             /*
 332              * Wanted code detecting POWER6 CPU and setting PPC_FPU64
 333              */
 334         }
 335     }
 336
 337     if (sigsetjmp(ill_jmp, 1) == 0) {
 338         OPENSSL_altivec_probe();
 339         OPENSSL_ppccap_P |= PPC_ALTIVEC;
 340         if (sigsetjmp(ill_jmp, 1) == 0) {
 341             OPENSSL_crypto207_probe();
 342             OPENSSL_ppccap_P |= PPC_CRYPTO207;
 343         }
 344     }
 345
 346     if (sigsetjmp(ill_jmp, 1) == 0) {
 347         OPENSSL_madd300_probe();
 348         OPENSSL_ppccap_P |= PPC_MADD300;
 349     }
 350
 351     sigaction(SIGILL, &ill_oact, NULL);
 352     sigprocmask(SIG_SETMASK, &oset, NULL);
 353 }