tools/testing/selftests/vDSO/vdso_call.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Macro to call vDSO functions
   4  *
   5  * Copyright (C) 2024 Christophe Leroy <christophe.leroy@csgroup.eu>, CS GROUP France
   6  */
   7 #ifndef __VDSO_CALL_H__
   8 #define __VDSO_CALL_H__
   9
  10 #ifdef __powerpc__
  11
  12 #define LOADARGS_1(fn, __arg1) do {                                     \
  13         _r0 = fn;                                                       \
  14         _r3 = (long)__arg1;                                             \
  15 } while (0)
  16
  17 #define LOADARGS_2(fn, __arg1, __arg2) do {                             \
  18         _r0 = fn;                                                       \
  19         _r3 = (long)__arg1;                                             \
  20         _r4 = (long)__arg2;                                             \
  21 } while (0)
  22
  23 #define LOADARGS_3(fn, __arg1, __arg2, __arg3) do {                     \
  24         _r0 = fn;                                                       \
  25         _r3 = (long)__arg1;                                             \
  26         _r4 = (long)__arg2;                                             \
  27         _r5 = (long)__arg3;                                             \
  28 } while (0)
  29
  30 #define LOADARGS_5(fn, __arg1, __arg2, __arg3, __arg4, __arg5) do {     \
  31         _r0 = fn;                                                       \
  32         _r3 = (long)__arg1;                                             \
  33         _r4 = (long)__arg2;                                             \
  34         _r5 = (long)__arg3;                                             \
  35         _r6 = (long)__arg4;                                             \
  36         _r7 = (long)__arg5;                                             \
  37 } while (0)
  38
  39 #define VDSO_CALL(fn, nr, args...) ({                                   \
  40         register void *_r0 asm ("r0");                                  \
  41         register long _r3 asm ("r3");                                   \
  42         register long _r4 asm ("r4");                                   \
  43         register long _r5 asm ("r5");                                   \
  44         register long _r6 asm ("r6");                                   \
  45         register long _r7 asm ("r7");                                   \
  46         register long _r8 asm ("r8");                                   \
  47         register long _rval asm ("r3");                                 \
  48                                                                         \
  49         LOADARGS_##nr(fn, args);                                        \
  50                                                                         \
  51         asm volatile(                                                   \
  52                 "       mtctr %0\n"                                     \
  53                 "       bctrl\n"                                        \
  54                 "       bns+    1f\n"                                   \
  55                 "       neg     3, 3\n"                                 \
  56                 "1:"                                                    \
  57                 : "+r" (_r0), "=r" (_r3), "+r" (_r4), "+r" (_r5),       \
  58                   "+r" (_r6), "+r" (_r7), "+r" (_r8)                    \
  59                 : "r" (_rval)                                           \
  60                 : "r9", "r10", "r11", "r12", "cr0", "cr1", "cr5",       \
  61                   "cr6", "cr7", "xer", "lr", "ctr", "memory"            \
  62         );                                                              \
  63         _rval;                                                          \
  64 })
  65
  66 #else
  67 #define VDSO_CALL(fn, nr, args...)      fn(args)
  68 #endif
  69
  70 #endif