crypto/ppccap.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <setjmp.h>
   5 #include <signal.h>
   6 #include <unistd.h>
   7 #if defined(__linux) || defined(_AIX)
   8 # include <sys/utsname.h>
   9 #endif
  10 #if defined(_AIX53)     /* defined even on post-5.3 */
  11 # include <sys/systemcfg.h>
  12 # if !defined(__power_set)
  13 #  define __power_set(a) (_system_configuration.implementation & (a))
  14 # endif
  15 #endif
  16 #include <openssl/crypto.h>
  17 #include <openssl/bn.h>
  18
  19 #include "ppc_arch.h"
  20
  21 unsigned int OPENSSL_ppccap_P = 0;
  22
  23 static sigset_t all_masked;
  24
  25 #ifdef OPENSSL_BN_ASM_MONT
  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_fpu64(BN_ULONG *rp, const BN_ULONG *ap,
  30                           const BN_ULONG *bp, const BN_ULONG *np,
  31                           const BN_ULONG *n0, int num);
  32     int bn_mul_mont_int(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,
  33                         const BN_ULONG *np, const BN_ULONG *n0, int num);
  34
  35     if (sizeof(size_t) == 4) {
  36 # if 1 || (defined(__APPLE__) && defined(__MACH__))
  37         if (num >= 8 && (num & 3) == 0 && (OPENSSL_ppccap_P & PPC_FPU64))
  38             return bn_mul_mont_fpu64(rp, ap, bp, np, n0, num);
  39 # else
  40         /*
  41          * boundary of 32 was experimentally determined on Linux 2.6.22,
  42          * might have to be adjusted on AIX...
  43          */
  44         if (num >= 32 && (num & 3) == 0 && (OPENSSL_ppccap_P & PPC_FPU64)) {
  45             sigset_t oset;
  46             int ret;
  47
  48             sigprocmask(SIG_SETMASK, &all_masked, &oset);
  49             ret = bn_mul_mont_fpu64(rp, ap, bp, np, n0, num);
  50             sigprocmask(SIG_SETMASK, &oset, NULL);
  51
  52             return ret;
  53         }
  54 # endif
  55     } else if ((OPENSSL_ppccap_P & PPC_FPU64))
  56         /*
  57          * this is a "must" on POWER6, but run-time detection is not
  58          * implemented yet...
  59          */
  60         return bn_mul_mont_fpu64(rp, ap, bp, np, n0, num);
  61
  62     return bn_mul_mont_int(rp, ap, bp, np, n0, num);
  63 }
  64 #endif
  65
  66 void sha256_block_p8(void *ctx, const void *inp, size_t len);
  67 void sha256_block_ppc(void *ctx, const void *inp, size_t len);
  68 void sha256_block_data_order(void *ctx, const void *inp, size_t len)
  69 {
  70     OPENSSL_ppccap_P & PPC_CRYPTO207 ? sha256_block_p8(ctx, inp, len) :
  71         sha256_block_ppc(ctx, inp, len);
  72 }
  73
  74 void sha512_block_p8(void *ctx, const void *inp, size_t len);
  75 void sha512_block_ppc(void *ctx, const void *inp, size_t len);
  76 void sha512_block_data_order(void *ctx, const void *inp, size_t len)
  77 {
  78     OPENSSL_ppccap_P & PPC_CRYPTO207 ? sha512_block_p8(ctx, inp, len) :
  79         sha512_block_ppc(ctx, inp, len);
  80 }
  81
  82 #ifndef OPENSSL_NO_CHACHA
  83 void ChaCha20_ctr32_int(unsigned char *out, const unsigned char *inp,
  84                         size_t len, const unsigned int key[8],
  85                         const unsigned int counter[4]);
  86 void ChaCha20_ctr32_vmx(unsigned char *out, const unsigned char *inp,
  87                         size_t len, const unsigned int key[8],
  88                         const unsigned int counter[4]);
  89 void ChaCha20_ctr32(unsigned char *out, const unsigned char *inp,
  90                     size_t len, const unsigned int key[8],
  91                     const unsigned int counter[4])
  92 {
  93     OPENSSL_ppccap_P & PPC_ALTIVEC
  94         ? ChaCha20_ctr32_vmx(out, inp, len, key, counter)
  95         : ChaCha20_ctr32_int(out, inp, len, key, counter);
  96 }
  97 #endif
  98
  99 #ifndef OPENSSL_NO_POLY1305
 100 void poly1305_init_int(void *ctx, const unsigned char key[16]);
 101 void poly1305_blocks(void *ctx, const unsigned char *inp, size_t len,
 102                          unsigned int padbit);
 103 void poly1305_emit(void *ctx, unsigned char mac[16],
 104                        const unsigned int nonce[4]);
 105 void poly1305_init_fpu(void *ctx, const unsigned char key[16]);
 106 void poly1305_blocks_fpu(void *ctx, const unsigned char *inp, size_t len,
 107                          unsigned int padbit);
 108 void poly1305_emit_fpu(void *ctx, unsigned char mac[16],
 109                        const unsigned int nonce[4]);
 110 int poly1305_init(void *ctx, const unsigned char key[16], void *func[2])
 111 {
 112     if (sizeof(size_t) == 4 && (OPENSSL_ppccap_P & PPC_FPU)) {
 113         poly1305_init_fpu(ctx,key);
 114         func[0] = poly1305_blocks_fpu;
 115         func[1] = poly1305_emit_fpu;
 116     } else {
 117         poly1305_init_int(ctx,key);
 118         func[0] = poly1305_blocks;
 119         func[1] = poly1305_emit;
 120     }
 121     return 1;
 122 }
 123 #endif
 124
 125 static sigjmp_buf ill_jmp;
 126 static void ill_handler(int sig)
 127 {
 128     siglongjmp(ill_jmp, sig);
 129 }
 130
 131 void OPENSSL_fpu_probe(void);
 132 void OPENSSL_ppc64_probe(void);
 133 void OPENSSL_altivec_probe(void);
 134 void OPENSSL_crypto207_probe(void);
 135 void OPENSSL_madd300_probe(void);
 136
 137 /*
 138  * Use a weak reference to getauxval() so we can use it if it is available
 139  * but don't break the build if it is not. Note that this is *link-time*
 140  * feature detection, not *run-time*. In other words if we link with
 141  * symbol present, it's expected to be present even at run-time.
 142  */
 143 #if defined(__GNUC__) && __GNUC__>=2 && defined(__ELF__)
 144 extern unsigned long getauxval(unsigned long type) __attribute__ ((weak));
 145 #else
 146 static unsigned long (*getauxval) (unsigned long) = NULL;
 147 #endif
 148
 149 /* I wish <sys/auxv.h> was universally available */
 150 #define HWCAP                   16      /* AT_HWCAP */
 151 #define HWCAP_PPC64             (1U << 30)
 152 #define HWCAP_ALTIVEC           (1U << 28)
 153 #define HWCAP_FPU               (1U << 27)
 154 #define HWCAP_POWER6_EXT        (1U << 9)
 155 #define HWCAP_VSX               (1U << 7)
 156
 157 #define HWCAP2                  26      /* AT_HWCAP2 */
 158 #define HWCAP_VEC_CRYPTO        (1U << 25)
 159 #define HWCAP_ARCH_3_00         (1U << 23)
 160
 161 # if defined(__GNUC__) && __GNUC__>=2
 162 __attribute__ ((constructor))
 163 # endif
 164 void OPENSSL_cpuid_setup(void)
 165 {
 166     char *e;
 167     struct sigaction ill_oact, ill_act;
 168     sigset_t oset;
 169     static int trigger = 0;
 170
 171     if (trigger)
 172         return;
 173     trigger = 1;
 174
 175     if ((e = getenv("OPENSSL_ppccap"))) {
 176         OPENSSL_ppccap_P = strtoul(e, NULL, 0);
 177         return;
 178     }
 179
 180     OPENSSL_ppccap_P = 0;
 181
 182 #if defined(_AIX)
 183     OPENSSL_ppccap_P |= PPC_FPU;
 184
 185     if (sizeof(size_t) == 4) {
 186         struct utsname uts;
 187 # if defined(_SC_AIX_KERNEL_BITMODE)
 188         if (sysconf(_SC_AIX_KERNEL_BITMODE) != 64)
 189             return;
 190 # endif
 191         if (uname(&uts) != 0 || atoi(uts.version) < 6)
 192             return;
 193     }
 194
 195 # if defined(__power_set)
 196     /*
 197      * Value used in __power_set is a single-bit 1<<n one denoting
 198      * specific processor class. Incidentally 0xffffffff<<n can be
 199      * used to denote specific processor and its successors.
 200      */
 201     if (sizeof(size_t) == 4) {
 202         /* In 32-bit case PPC_FPU64 is always fastest [if option] */
 203         if (__power_set(0xffffffffU<<13))       /* POWER5 and later */
 204             OPENSSL_ppccap_P |= PPC_FPU64;
 205     } else {
 206         /* In 64-bit case PPC_FPU64 is fastest only on POWER6 */
 207         if (__power_set(0x1U<<14))              /* POWER6 */
 208             OPENSSL_ppccap_P |= PPC_FPU64;
 209     }
 210
 211     if (__power_set(0xffffffffU<<14))           /* POWER6 and later */
 212         OPENSSL_ppccap_P |= PPC_ALTIVEC;
 213
 214     if (__power_set(0xffffffffU<<16))           /* POWER8 and later */
 215         OPENSSL_ppccap_P |= PPC_CRYPTO207;
 216
 217     if (__power_set(0xffffffffU<<17))           /* POWER9 and later */
 218         OPENSSL_ppccap_P |= PPC_MADD300;
 219
 220     return;
 221 # endif
 222 #endif
 223
 224     if (getauxval != NULL) {
 225         unsigned long hwcap = getauxval(HWCAP);
 226
 227         if (hwcap & HWCAP_FPU) {
 228             OPENSSL_ppccap_P |= PPC_FPU;
 229
 230             if (sizeof(size_t) == 4) {
 231                 /* In 32-bit case PPC_FPU64 is always fastest [if option] */
 232                 if (hwcap & HWCAP_PPC64)
 233                     OPENSSL_ppccap_P |= PPC_FPU64;
 234             } else {
 235                 /* In 64-bit case PPC_FPU64 is fastest only on POWER6 */
 236                 if (hwcap & HWCAP_POWER6_EXT)
 237                     OPENSSL_ppccap_P |= PPC_FPU64;
 238             }
 239         }
 240
 241         if (hwcap & HWCAP_ALTIVEC) {
 242             OPENSSL_ppccap_P |= PPC_ALTIVEC;
 243
 244             if ((hwcap & HWCAP_VSX) && (getauxval(HWCAP2) & HWCAP_VEC_CRYPTO))
 245                 OPENSSL_ppccap_P |= PPC_CRYPTO207;
 246         }
 247
 248         if (hwcap & HWCAP_ARCH_3_00) {
 249             OPENSSL_ppccap_P |= PPC_MADD300;
 250         }
 251
 252         return;
 253     }
 254
 255     sigfillset(&all_masked);
 256     sigdelset(&all_masked, SIGILL);
 257     sigdelset(&all_masked, SIGTRAP);
 258 #ifdef SIGEMT
 259     sigdelset(&all_masked, SIGEMT);
 260 #endif
 261     sigdelset(&all_masked, SIGFPE);
 262     sigdelset(&all_masked, SIGBUS);
 263     sigdelset(&all_masked, SIGSEGV);
 264
 265     memset(&ill_act, 0, sizeof(ill_act));
 266     ill_act.sa_handler = ill_handler;
 267     ill_act.sa_mask = all_masked;
 268
 269     sigprocmask(SIG_SETMASK, &ill_act.sa_mask, &oset);
 270     sigaction(SIGILL, &ill_act, &ill_oact);
 271
 272     if (sigsetjmp(ill_jmp,1) == 0) {
 273         OPENSSL_fpu_probe();
 274         OPENSSL_ppccap_P |= PPC_FPU;
 275
 276         if (sizeof(size_t) == 4) {
 277 #ifdef __linux
 278             struct utsname uts;
 279             if (uname(&uts) == 0 && strcmp(uts.machine, "ppc64") == 0)
 280 #endif
 281                 if (sigsetjmp(ill_jmp, 1) == 0) {
 282                     OPENSSL_ppc64_probe();
 283                     OPENSSL_ppccap_P |= PPC_FPU64;
 284                 }
 285         } else {
 286             /*
 287              * Wanted code detecting POWER6 CPU and setting PPC_FPU64
 288              */
 289         }
 290     }
 291
 292     if (sigsetjmp(ill_jmp, 1) == 0) {
 293         OPENSSL_altivec_probe();
 294         OPENSSL_ppccap_P |= PPC_ALTIVEC;
 295         if (sigsetjmp(ill_jmp, 1) == 0) {
 296             OPENSSL_crypto207_probe();
 297             OPENSSL_ppccap_P |= PPC_CRYPTO207;
 298         }
 299     }
 300
 301     if (sigsetjmp(ill_jmp, 1) == 0) {
 302         OPENSSL_madd300_probe();
 303         OPENSSL_ppccap_P |= PPC_MADD300;
 304     }
 305
 306     sigaction(SIGILL, &ill_oact, NULL);
 307     sigprocmask(SIG_SETMASK, &oset, NULL);
 308 }