gdb/testsuite/gdb.reverse/insn-reverse-x86.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2017-2021 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #include <cpuid.h>
  19 #include <stdint.h>
  20
  21 /* 0 if the CPU supports rdrand and non-zero otherwise.  */
  22 static unsigned int supports_rdrand;
  23
  24 /* 0 if the CPU supports rdseed and non-zero otherwise.  */
  25 static unsigned int supports_rdseed;
  26
  27 /* Check supported features and set globals accordingly.  The globals
  28    can be used to prevent unsupported tests from running.  */
  29
  30 static void
  31 check_supported_features (void)
  32 {
  33   unsigned int rdrand_mask = (1 << 30);
  34   unsigned int rdseed_mask = (1 << 18);
  35   unsigned int eax, ebx, ecx, edx;
  36   unsigned int vendor;
  37   unsigned int max_level;
  38
  39   max_level = __get_cpuid_max (0, &vendor);
  40
  41   if (max_level < 1)
  42     return;
  43
  44   __cpuid (1, eax, ebx, ecx, edx);
  45
  46   supports_rdrand = ((ecx & rdrand_mask) == rdrand_mask);
  47
  48   if (max_level >= 7)
  49     {
  50       __cpuid_count (7, 0, eax, ebx, ecx, edx);
  51       supports_rdseed = ((ebx & rdseed_mask) == rdseed_mask);
  52     }
  53 }
  54
  55 /* Test rdrand support for various output registers.  */
  56
  57 void
  58 rdrand (void)
  59 {
  60   /* Get a random number from the rdrand assembly instruction.  */
  61   register uint64_t number;
  62
  63   if (!supports_rdrand)
  64     return;
  65
  66   /* 16-bit random numbers.  */
  67   __asm__ volatile ("rdrand %%ax;" : "=r" (number));
  68   __asm__ volatile ("rdrand %%bx;" : "=r" (number));
  69   __asm__ volatile ("rdrand %%cx;" : "=r" (number));
  70   __asm__ volatile ("rdrand %%dx;" : "=r" (number));
  71
  72   __asm__ volatile ("mov %%di, %%ax;" : "=r" (number));
  73   __asm__ volatile ("rdrand %%di;" : "=r" (number));
  74   __asm__ volatile ("mov %%ax, %%di;" : "=r" (number));
  75
  76   __asm__ volatile ("mov %%si, %%ax;" : "=r" (number));
  77   __asm__ volatile ("rdrand %%si;" : "=r" (number));
  78   __asm__ volatile ("mov %%ax, %%si;" : "=r" (number));
  79
  80   __asm__ volatile ("mov %%bp, %%ax;" : "=r" (number));
  81   __asm__ volatile ("rdrand %%bp;" : "=r" (number));
  82   __asm__ volatile ("mov %%ax, %%bp;" : "=r" (number));
  83
  84   __asm__ volatile ("mov %%sp, %%ax;" : "=r" (number));
  85   __asm__ volatile ("rdrand %%sp;" : "=r" (number));
  86   __asm__ volatile ("mov %%ax, %%sp;" : "=r" (number));
  87
  88 #ifdef __x86_64__
  89   __asm__ volatile ("rdrand %%r8w;" : "=r" (number));
  90   __asm__ volatile ("rdrand %%r9w;" : "=r" (number));
  91   __asm__ volatile ("rdrand %%r10w;" : "=r" (number));
  92   __asm__ volatile ("rdrand %%r11w;" : "=r" (number));
  93   __asm__ volatile ("rdrand %%r12w;" : "=r" (number));
  94   __asm__ volatile ("rdrand %%r13w;" : "=r" (number));
  95   __asm__ volatile ("rdrand %%r14w;" : "=r" (number));
  96   __asm__ volatile ("rdrand %%r15w;" : "=r" (number));
  97 #endif
  98
  99   /* 32-bit random numbers.  */
 100   __asm__ volatile ("rdrand %%eax;" : "=r" (number));
 101   __asm__ volatile ("rdrand %%ebx;" : "=r" (number));
 102   __asm__ volatile ("rdrand %%ecx;" : "=r" (number));
 103   __asm__ volatile ("rdrand %%edx;" : "=r" (number));
 104
 105 #ifdef __x86_64__
 106   __asm__ volatile ("mov %%rdi, %%rax;" : "=r" (number));
 107   __asm__ volatile ("rdrand %%edi;" : "=r" (number));
 108   __asm__ volatile ("mov %%rax, %%rdi;" : "=r" (number));
 109
 110   __asm__ volatile ("mov %%rsi, %%rax;" : "=r" (number));
 111   __asm__ volatile ("rdrand %%esi;" : "=r" (number));
 112   __asm__ volatile ("mov %%rax, %%rsi;" : "=r" (number));
 113
 114   __asm__ volatile ("mov %%rbp, %%rax;" : "=r" (number));
 115   __asm__ volatile ("rdrand %%ebp;" : "=r" (number));
 116   __asm__ volatile ("mov %%rax, %%rbp;" : "=r" (number));
 117
 118   __asm__ volatile ("mov %%rsp, %%rax;" : "=r" (number));
 119   __asm__ volatile ("rdrand %%esp;" : "=r" (number));
 120   __asm__ volatile ("mov %%rax, %%rsp;" : "=r" (number));
 121
 122   __asm__ volatile ("rdrand %%r8d;" : "=r" (number));
 123   __asm__ volatile ("rdrand %%r9d;" : "=r" (number));
 124   __asm__ volatile ("rdrand %%r10d;" : "=r" (number));
 125   __asm__ volatile ("rdrand %%r11d;" : "=r" (number));
 126   __asm__ volatile ("rdrand %%r12d;" : "=r" (number));
 127   __asm__ volatile ("rdrand %%r13d;" : "=r" (number));
 128   __asm__ volatile ("rdrand %%r14d;" : "=r" (number));
 129   __asm__ volatile ("rdrand %%r15d;" : "=r" (number));
 130
 131   /* 64-bit random numbers.  */
 132   __asm__ volatile ("rdrand %%rax;" : "=r" (number));
 133   __asm__ volatile ("rdrand %%rbx;" : "=r" (number));
 134   __asm__ volatile ("rdrand %%rcx;" : "=r" (number));
 135   __asm__ volatile ("rdrand %%rdx;" : "=r" (number));
 136
 137   __asm__ volatile ("mov %%rdi, %%rax;" : "=r" (number));
 138   __asm__ volatile ("rdrand %%rdi;" : "=r" (number));
 139   __asm__ volatile ("mov %%rax, %%rdi;" : "=r" (number));
 140
 141   __asm__ volatile ("mov %%rsi, %%rax;" : "=r" (number));
 142   __asm__ volatile ("rdrand %%rsi;" : "=r" (number));
 143   __asm__ volatile ("mov %%rax, %%rsi;" : "=r" (number));
 144
 145   __asm__ volatile ("mov %%rbp, %%rax;" : "=r" (number));
 146   __asm__ volatile ("rdrand %%rbp;" : "=r" (number));
 147   __asm__ volatile ("mov %%rax, %%rbp;" : "=r" (number));
 148
 149   __asm__ volatile ("mov %%rsp, %%rax;" : "=r" (number));
 150   __asm__ volatile ("rdrand %%rsp;" : "=r" (number));
 151   __asm__ volatile ("mov %%rax, %%rsp;" : "=r" (number));
 152
 153   __asm__ volatile ("rdrand %%r8;" : "=r" (number));
 154   __asm__ volatile ("rdrand %%r9;" : "=r" (number));
 155   __asm__ volatile ("rdrand %%r10;" : "=r" (number));
 156   __asm__ volatile ("rdrand %%r11;" : "=r" (number));
 157   __asm__ volatile ("rdrand %%r12;" : "=r" (number));
 158   __asm__ volatile ("rdrand %%r13;" : "=r" (number));
 159   __asm__ volatile ("rdrand %%r14;" : "=r" (number));
 160   __asm__ volatile ("rdrand %%r15;" : "=r" (number));
 161 #endif
 162 }
 163
 164 /* Test rdseed support for various output registers.  */
 165
 166 void
 167 rdseed (void)
 168 {
 169   /* Get a random seed from the rdseed assembly instruction.  */
 170   register long seed;
 171
 172   if (!supports_rdseed)
 173     return;
 174
 175   /* 16-bit random seeds.  */
 176   __asm__ volatile ("rdseed %%ax;" : "=r" (seed));
 177   __asm__ volatile ("rdseed %%bx;" : "=r" (seed));
 178   __asm__ volatile ("rdseed %%cx;" : "=r" (seed));
 179   __asm__ volatile ("rdseed %%dx;" : "=r" (seed));
 180
 181   __asm__ volatile ("mov %%di, %%ax;" : "=r" (seed));
 182   __asm__ volatile ("rdseed %%di;" : "=r" (seed));
 183   __asm__ volatile ("mov %%ax, %%di;" : "=r" (seed));
 184
 185   __asm__ volatile ("mov %%si, %%ax;" : "=r" (seed));
 186   __asm__ volatile ("rdseed %%si;" : "=r" (seed));
 187   __asm__ volatile ("mov %%ax, %%si;" : "=r" (seed));
 188
 189   __asm__ volatile ("mov %%bp, %%ax;" : "=r" (seed));
 190   __asm__ volatile ("rdseed %%bp;" : "=r" (seed));
 191   __asm__ volatile ("mov %%ax, %%bp;" : "=r" (seed));
 192
 193   __asm__ volatile ("mov %%sp, %%ax;" : "=r" (seed));
 194   __asm__ volatile ("rdseed %%sp;" : "=r" (seed));
 195   __asm__ volatile ("mov %%ax, %%sp;" : "=r" (seed));
 196
 197 #ifdef __x86_64__
 198   __asm__ volatile ("rdseed %%r8w;" : "=r" (seed));
 199   __asm__ volatile ("rdseed %%r9w;" : "=r" (seed));
 200   __asm__ volatile ("rdseed %%r10w;" : "=r" (seed));
 201   __asm__ volatile ("rdseed %%r11w;" : "=r" (seed));
 202   __asm__ volatile ("rdseed %%r12w;" : "=r" (seed));
 203   __asm__ volatile ("rdseed %%r13w;" : "=r" (seed));
 204   __asm__ volatile ("rdseed %%r14w;" : "=r" (seed));
 205   __asm__ volatile ("rdseed %%r15w;" : "=r" (seed));
 206 #endif
 207
 208   /* 32-bit random seeds.  */
 209   __asm__ volatile ("rdseed %%eax;" : "=r" (seed));
 210   __asm__ volatile ("rdseed %%ebx;" : "=r" (seed));
 211   __asm__ volatile ("rdseed %%ecx;" : "=r" (seed));
 212   __asm__ volatile ("rdseed %%edx;" : "=r" (seed));
 213
 214 #ifdef __x86_64__
 215   __asm__ volatile ("mov %%rdi, %%rax;" : "=r" (seed));
 216   __asm__ volatile ("rdseed %%edi;" : "=r" (seed));
 217   __asm__ volatile ("mov %%rax, %%rdi;" : "=r" (seed));
 218
 219   __asm__ volatile ("mov %%rsi, %%rax;" : "=r" (seed));
 220   __asm__ volatile ("rdseed %%esi;" : "=r" (seed));
 221   __asm__ volatile ("mov %%rax, %%rsi;" : "=r" (seed));
 222
 223   __asm__ volatile ("mov %%rbp, %%rax;" : "=r" (seed));
 224   __asm__ volatile ("rdseed %%ebp;" : "=r" (seed));
 225   __asm__ volatile ("mov %%rax, %%rbp;" : "=r" (seed));
 226
 227   __asm__ volatile ("mov %%rsp, %%rax;" : "=r" (seed));
 228   __asm__ volatile ("rdseed %%esp;" : "=r" (seed));
 229   __asm__ volatile ("mov %%rax, %%rsp;" : "=r" (seed));
 230
 231   __asm__ volatile ("rdseed %%r8d;" : "=r" (seed));
 232   __asm__ volatile ("rdseed %%r9d;" : "=r" (seed));
 233   __asm__ volatile ("rdseed %%r10d;" : "=r" (seed));
 234   __asm__ volatile ("rdseed %%r11d;" : "=r" (seed));
 235   __asm__ volatile ("rdseed %%r12d;" : "=r" (seed));
 236   __asm__ volatile ("rdseed %%r13d;" : "=r" (seed));
 237   __asm__ volatile ("rdseed %%r14d;" : "=r" (seed));
 238   __asm__ volatile ("rdseed %%r15d;" : "=r" (seed));
 239
 240   /* 64-bit random seeds.  */
 241   __asm__ volatile ("rdseed %%rax;" : "=r" (seed));
 242   __asm__ volatile ("rdseed %%rbx;" : "=r" (seed));
 243   __asm__ volatile ("rdseed %%rcx;" : "=r" (seed));
 244   __asm__ volatile ("rdseed %%rdx;" : "=r" (seed));
 245
 246   __asm__ volatile ("mov %%rdi, %%rax;" : "=r" (seed));
 247   __asm__ volatile ("rdseed %%rdi;" : "=r" (seed));
 248   __asm__ volatile ("mov %%rax, %%rdi;" : "=r" (seed));
 249
 250   __asm__ volatile ("mov %%rsi, %%rax;" : "=r" (seed));
 251   __asm__ volatile ("rdseed %%rsi;" : "=r" (seed));
 252   __asm__ volatile ("mov %%rax, %%rsi;" : "=r" (seed));
 253
 254   __asm__ volatile ("mov %%rbp, %%rax;" : "=r" (seed));
 255   __asm__ volatile ("rdseed %%rbp;" : "=r" (seed));
 256   __asm__ volatile ("mov %%rax, %%rbp;" : "=r" (seed));
 257
 258   __asm__ volatile ("mov %%rsp, %%rax;" : "=r" (seed));
 259   __asm__ volatile ("rdseed %%rsp;" : "=r" (seed));
 260   __asm__ volatile ("mov %%rax, %%rsp;" : "=r" (seed));
 261
 262   __asm__ volatile ("rdseed %%r8;" : "=r" (seed));
 263   __asm__ volatile ("rdseed %%r9;" : "=r" (seed));
 264   __asm__ volatile ("rdseed %%r10;" : "=r" (seed));
 265   __asm__ volatile ("rdseed %%r11;" : "=r" (seed));
 266   __asm__ volatile ("rdseed %%r12;" : "=r" (seed));
 267   __asm__ volatile ("rdseed %%r13;" : "=r" (seed));
 268   __asm__ volatile ("rdseed %%r14;" : "=r" (seed));
 269   __asm__ volatile ("rdseed %%r15;" : "=r" (seed));
 270 #endif
 271 }
 272
 273 /* Initialize arch-specific bits.  */
 274
 275 static void
 276 initialize (void)
 277 {
 278   /* Initialize supported features.  */
 279   check_supported_features ();
 280 }
 281
 282 /* Functions testing instruction decodings.  GDB will test all of these.  */
 283 static testcase_ftype testcases[] =
 284 {
 285   rdrand,
 286   rdseed
 287 };