none/tests/ppc64/scv_test.c

   1 #include <stdio.h>
   2 #include <stdint.h>
   3 #include <stdlib.h>
   4
   5 #ifdef HAS_ISA_3_00
   6 #include <asm/unistd.h>
   7 #include <sys/auxv.h>
   8
   9 #define ASM_INPUT_0 "0" (r0)
  10
  11 #define INTERNAL_SYSCALL_SCV(name, nr) \
  12   ({                                                                    \
  13     register long int r0  __asm__ ("r0");                               \
  14     register long int r3  __asm__ ("r3");                               \
  15     register long int r4  __asm__ ("r4");                               \
  16     register long int r5  __asm__ ("r5");                               \
  17     register long int r6  __asm__ ("r6");                               \
  18     register long int r7  __asm__ ("r7");                               \
  19     register long int r8  __asm__ ("r8");                               \
  20     r0=name;                                                            \
  21     __asm__ __volatile__                                                \
  22       (".machine power9\n"                                              \
  23        "scv 0\n\t"                                                      \
  24        "0:"                                                             \
  25        : "=&r" (r0),                                                    \
  26          "=&r" (r3), "=&r" (r4), "=&r" (r5),                            \
  27          "=&r" (r6), "=&r" (r7), "=&r" (r8)                             \
  28        : ASM_INPUT_##nr                                                 \
  29        : "r9", "r10", "r11", "r12",                                     \
  30          "cr0", "cr1", "cr5", "cr6", "cr7", "xer",                      \
  31          "lr", "ctr", "memory");                                        \
  32     r3;                                                                 \
  33   })
  34
  35 #define INTERNAL_SYSCALL_SC(name, nr) \
  36   ({                                                                    \
  37     register long int r0  __asm__ ("r0");                               \
  38     register long int r3  __asm__ ("r3");                               \
  39     register long int r4  __asm__ ("r4");                               \
  40     register long int r5  __asm__ ("r5");                               \
  41     register long int r6  __asm__ ("r6");                               \
  42     register long int r7  __asm__ ("r7");                               \
  43     register long int r8  __asm__ ("r8");                               \
  44     r0=name;                                                            \
  45     __asm__ __volatile__                                                \
  46       ("sc\n\t"                                                         \
  47        "mfcr %0\n\t"                                                    \
  48        "0:"                                                             \
  49        : "=&r" (r0),                                                    \
  50          "=&r" (r3), "=&r" (r4), "=&r" (r5),                            \
  51          "=&r" (r6), "=&r" (r7), "=&r" (r8)                             \
  52        : ASM_INPUT_##nr                                                 \
  53        : "r9", "r10", "r11", "r12",                                     \
  54          "xer", "cr0", "ctr", "memory");                                \
  55     r0 & (1 << 28) ? -r3 : r3; \
  56   })
  57
  58 #define PPC_FEATURE2_SCV           0x00100000 /* scv syscall enabled */
  59
  60 #endif
  61
  62 int
  63 main(void)
  64 {
  65
  66 #ifdef HAS_ISA_3_00
  67   int result;
  68   unsigned long hwcaps2_val;
  69
  70   result = INTERNAL_SYSCALL_SC(__NR_gettid, 0);
  71
  72   if (result < 0) {
  73     printf("The sc instruction test unexpectedly failed\n");
  74     exit (-1);
  75   }
  76
  77   hwcaps2_val = getauxval(AT_HWCAP2);
  78
  79   if ((hwcaps2_val & PPC_FEATURE2_SCV) == PPC_FEATURE2_SCV) {
  80     /* system supports the scv instruction */
  81     result = INTERNAL_SYSCALL_SCV(__NR_gettid, 0);
  82
  83     if (result < 0) {
  84       printf("The scv instruction test unexpectedly failed\n");
  85       exit (-1);
  86     }
  87   }
  88
  89   printf("Success\n");
  90 #else
  91   printf("HAS_ISA_3_00 not detected.\n");
  92 #endif
  93   return 0;
  94 }