gdb/testsuite/gdb.arch/aarch64-sme-core.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2023-2024 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 /* Exercise AArch64's Scalable Vector/Matrix Extension core file generation
  19    for GDB.  This includes reading Linux Kernel-generated core files and
  20    writing GDB core files via the gcore command and making sure the contents
  21    are sane.  */
  22
  23 #include <stdio.h>
  24 #include <sys/auxv.h>
  25 #include <sys/prctl.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <unistd.h>
  29
  30 #ifndef HWCAP_SVE
  31 #define HWCAP_SVE (1 << 22)
  32 #endif
  33
  34 #ifndef HWCAP2_SME
  35 #define HWCAP2_SME (1 << 23)
  36 #endif
  37
  38 #ifndef HWCAP2_SME2
  39 #define HWCAP2_SME2 (1UL << 37)
  40 #define HWCAP2_SME2P1 (1UL << 38)
  41 #endif
  42
  43 #ifndef PR_SVE_SET_VL
  44 #define PR_SVE_SET_VL 50
  45 #define PR_SVE_GET_VL 51
  46 #define PR_SVE_VL_LEN_MASK 0xffff
  47 #endif
  48
  49 #ifndef PR_SME_SET_VL
  50 #define PR_SME_SET_VL 63
  51 #define PR_SME_GET_VL 64
  52 #define PR_SME_VL_LEN_MASK 0xffff
  53 #endif
  54
  55 static void
  56 enable_za ()
  57 {
  58   /* smstart za */
  59   __asm __volatile (".word 0xD503457F");
  60 }
  61
  62 static void
  63 disable_za ()
  64 {
  65   /* smstop za */
  66   __asm __volatile (".word 0xD503447F");
  67 }
  68
  69 static void
  70 enable_sm ()
  71 {
  72   /* smstart sm */
  73   __asm __volatile (".word 0xD503437F");
  74 }
  75
  76 static void
  77 disable_sm ()
  78 {
  79   /* smstop sm */
  80   __asm __volatile (".word 0xD503427F");
  81 }
  82
  83 static void
  84 initialize_fpsimd_state ()
  85 {
  86   char buffer[16];
  87
  88   for (int i = 0; i < 16; i++)
  89     buffer[i] = 0x55;
  90
  91   __asm __volatile ("mov x0, %0\n\t" \
  92                     : : "r" (buffer));
  93
  94   __asm __volatile ("ldr q0, [x0]");
  95   __asm __volatile ("ldr q1, [x0]");
  96   __asm __volatile ("ldr q2, [x0]");
  97   __asm __volatile ("ldr q3, [x0]");
  98   __asm __volatile ("ldr q4, [x0]");
  99   __asm __volatile ("ldr q5, [x0]");
 100   __asm __volatile ("ldr q6, [x0]");
 101   __asm __volatile ("ldr q7, [x0]");
 102   __asm __volatile ("ldr q8, [x0]");
 103   __asm __volatile ("ldr q9, [x0]");
 104   __asm __volatile ("ldr q10, [x0]");
 105   __asm __volatile ("ldr q11, [x0]");
 106   __asm __volatile ("ldr q12, [x0]");
 107   __asm __volatile ("ldr q13, [x0]");
 108   __asm __volatile ("ldr q14, [x0]");
 109   __asm __volatile ("ldr q15, [x0]");
 110   __asm __volatile ("ldr q16, [x0]");
 111   __asm __volatile ("ldr q17, [x0]");
 112   __asm __volatile ("ldr q18, [x0]");
 113   __asm __volatile ("ldr q19, [x0]");
 114   __asm __volatile ("ldr q20, [x0]");
 115   __asm __volatile ("ldr q21, [x0]");
 116   __asm __volatile ("ldr q22, [x0]");
 117   __asm __volatile ("ldr q23, [x0]");
 118   __asm __volatile ("ldr q24, [x0]");
 119   __asm __volatile ("ldr q25, [x0]");
 120   __asm __volatile ("ldr q26, [x0]");
 121   __asm __volatile ("ldr q27, [x0]");
 122   __asm __volatile ("ldr q28, [x0]");
 123   __asm __volatile ("ldr q29, [x0]");
 124   __asm __volatile ("ldr q30, [x0]");
 125   __asm __volatile ("ldr q31, [x0]");
 126 }
 127
 128 static void
 129 initialize_za_state ()
 130 {
 131   /* zero za */
 132   __asm __volatile (".word 0xC00800FF");
 133
 134   char buffer[256];
 135
 136   for (int i = 0; i < 256; i++)
 137     buffer[i] = 0xaa;
 138
 139   __asm __volatile ("mov x0, %0\n\t" \
 140                     : : "r" (buffer));
 141
 142   /* Initialize loop boundaries.  */
 143   __asm __volatile ("mov w12, 0");
 144   __asm __volatile ("mov w17, 256");
 145
 146   /* loop: ldr za[w12, 0], [x0] */
 147   __asm __volatile ("loop: .word 0xe1000000");
 148   __asm __volatile ("add w12, w12, 1");
 149   __asm __volatile ("cmp w12, w17");
 150   __asm __volatile ("bne loop");
 151 }
 152
 153 static void
 154 initialize_zt_state ()
 155 {
 156   unsigned long hwcap2 = getauxval (AT_HWCAP2);
 157
 158   if (!(hwcap2 & HWCAP2_SME2) && !(hwcap2 & HWCAP2_SME2P1))
 159     return;
 160
 161   char buffer[64];
 162
 163   for (int i = 0; i < 64; i++)
 164     buffer[i] = 0xff;
 165
 166   __asm __volatile ("mov x0, %0\n\t" \
 167                     : : "r" (buffer));
 168
 169   /* Initialize ZT0.  */
 170   /* ldr zt0, x0 */
 171   __asm __volatile (".word 0xe11f8000");
 172 }
 173
 174 static void
 175 initialize_tpidr2 ()
 176 {
 177   __asm __volatile ("mov x0, #0xffffffffffffffff");
 178
 179   /* Write x0 to tpidr2.  */
 180   __asm __volatile (".word 0xd51bd0a0");
 181 }
 182
 183 static void
 184 initialize_sve_state ()
 185 {
 186   __asm __volatile ("dup z0.b, -1");
 187   __asm __volatile ("dup z1.b, -1");
 188   __asm __volatile ("dup z2.b, -1");
 189   __asm __volatile ("dup z3.b, -1");
 190   __asm __volatile ("dup z4.b, -1");
 191   __asm __volatile ("dup z5.b, -1");
 192   __asm __volatile ("dup z6.b, -1");
 193   __asm __volatile ("dup z7.b, -1");
 194   __asm __volatile ("dup z8.b, -1");
 195   __asm __volatile ("dup z9.b, -1");
 196   __asm __volatile ("dup z10.b, -1");
 197   __asm __volatile ("dup z11.b, -1");
 198   __asm __volatile ("dup z12.b, -1");
 199   __asm __volatile ("dup z13.b, -1");
 200   __asm __volatile ("dup z14.b, -1");
 201   __asm __volatile ("dup z15.b, -1");
 202   __asm __volatile ("dup z16.b, -1");
 203   __asm __volatile ("dup z17.b, -1");
 204   __asm __volatile ("dup z18.b, -1");
 205   __asm __volatile ("dup z19.b, -1");
 206   __asm __volatile ("dup z20.b, -1");
 207   __asm __volatile ("dup z21.b, -1");
 208   __asm __volatile ("dup z22.b, -1");
 209   __asm __volatile ("dup z23.b, -1");
 210   __asm __volatile ("dup z24.b, -1");
 211   __asm __volatile ("dup z25.b, -1");
 212   __asm __volatile ("dup z26.b, -1");
 213   __asm __volatile ("dup z27.b, -1");
 214   __asm __volatile ("dup z28.b, -1");
 215   __asm __volatile ("dup z29.b, -1");
 216   __asm __volatile ("dup z30.b, -1");
 217   __asm __volatile ("dup z31.b, -1");
 218   __asm __volatile ("ptrue p0.b");
 219   __asm __volatile ("ptrue p1.b");
 220   __asm __volatile ("ptrue p2.b");
 221   __asm __volatile ("ptrue p3.b");
 222   __asm __volatile ("ptrue p4.b");
 223   __asm __volatile ("ptrue p5.b");
 224   __asm __volatile ("ptrue p6.b");
 225   __asm __volatile ("ptrue p7.b");
 226   __asm __volatile ("ptrue p8.b");
 227   __asm __volatile ("ptrue p9.b");
 228   __asm __volatile ("ptrue p10.b");
 229   __asm __volatile ("ptrue p11.b");
 230   __asm __volatile ("ptrue p12.b");
 231   __asm __volatile ("ptrue p13.b");
 232   __asm __volatile ("ptrue p14.b");
 233   __asm __volatile ("ptrue p15.b");
 234   __asm __volatile ("setffr");
 235 }
 236
 237 static int get_vl_size ()
 238 {
 239   int res = prctl (PR_SVE_GET_VL, 0, 0, 0, 0);
 240   if (res < 0)
 241     {
 242       printf ("FAILED to PR_SVE_GET_VL (%d)", res);
 243       return -1;
 244     }
 245   return (res & PR_SVE_VL_LEN_MASK);
 246 }
 247
 248 static int get_svl_size ()
 249 {
 250   int res = prctl (PR_SME_GET_VL, 0, 0, 0, 0);
 251   if (res < 0)
 252     {
 253       printf ("FAILED to PR_SME_GET_VL (%d)\n", res);
 254       return -1;
 255     }
 256   return (res & PR_SVE_VL_LEN_MASK);
 257 }
 258
 259 static int set_vl_size (int new_vl)
 260 {
 261   int res = prctl (PR_SVE_SET_VL, new_vl, 0, 0, 0, 0);
 262   if (res < 0)
 263     {
 264       printf ("FAILED to PR_SVE_SET_VL (%d)\n", res);
 265       return -1;
 266     }
 267
 268   res = get_vl_size ();
 269   if (res != new_vl)
 270     {
 271       printf ("Unexpected VL value (%d)\n", res);
 272       return -1;
 273     }
 274
 275   return res;
 276 }
 277
 278 static int set_svl_size (int new_svl)
 279 {
 280   int res = prctl (PR_SME_SET_VL, new_svl, 0, 0, 0, 0);
 281   if (res < 0)
 282     {
 283       printf ("FAILED to PR_SME_SET_VL (%d)\n", res);
 284       return -1;
 285     }
 286
 287   res = get_svl_size ();
 288   if (res != new_svl)
 289     {
 290       printf ("Unexpected SVL value (%d)\n", res);
 291       return -1;
 292     }
 293
 294   return res;
 295 }
 296
 297 /* Enable register states based on STATE.
 298
 299    0 - FPSIMD
 300    1 - SVE
 301    2 - SSVE
 302    3 - ZA (+ SME2 ZT0)
 303    4 - ZA and SSVE (+ SME2 ZT0).  */
 304
 305 void enable_states (int state)
 306 {
 307   disable_za ();
 308   disable_sm ();
 309   initialize_fpsimd_state ();
 310
 311   if (state == 1)
 312     {
 313       initialize_sve_state ();
 314     }
 315   else if (state == 2)
 316     {
 317       enable_sm ();
 318       initialize_sve_state ();
 319     }
 320   else if (state == 3)
 321     {
 322       enable_za ();
 323       initialize_za_state ();
 324       initialize_zt_state ();
 325     }
 326   else if (state == 4)
 327     {
 328       enable_za ();
 329       enable_sm ();
 330       initialize_sve_state ();
 331       initialize_za_state ();
 332       initialize_zt_state ();
 333     }
 334
 335   return;
 336 }
 337
 338 static int
 339 test_id_to_state (int id)
 340 {
 341   return id / 25;
 342 }
 343
 344 static int
 345 test_id_to_vl (int id)
 346 {
 347   return 16 << ((id / 5) % 5);
 348 }
 349
 350 static int
 351 test_id_to_svl (int id)
 352 {
 353   return 16 << (id % 5);
 354 }
 355
 356 static void
 357 dummy ()
 358 {
 359 }
 360
 361 int
 362 main (int argc, char **argv)
 363 {
 364   if (argc > 2)
 365     printf ("Incorrect number of arguments passed to test.\n");
 366
 367   if (getauxval (AT_HWCAP) & HWCAP_SVE && getauxval (AT_HWCAP2) & HWCAP2_SME)
 368     {
 369       long test_id = 0;
 370
 371       /* If we have a test id passed as argument, read it now.  */
 372       if (argc == 2)
 373         test_id = strtol (argv[1], NULL, 0);
 374
 375       dummy (); /* stop to initialize test_id */
 376
 377       int state = test_id_to_state (test_id);
 378       int vl = test_id_to_vl (test_id);
 379       int svl = test_id_to_svl (test_id);
 380
 381       if (set_vl_size (vl) == -1 || set_svl_size (svl) == -1)
 382         return -1;
 383
 384       enable_states (state);
 385
 386       /* Also set the TPIDR2 register so we can test dumping its contents
 387          to a core file.  */
 388       initialize_tpidr2 ();
 389
 390       char *p = 0x0;
 391       *p = 0xff; /* crash point */
 392     }
 393   else
 394     {
 395       printf ("SKIP: no HWCAP_SVE or HWCAP2_SME on this system\n");
 396       return -1;
 397     }
 398
 399   return 0;
 400 }