tests/tcg/riscv64/semicall.h

   1 /*
   2  * Semihosting Tests - RiscV64 Helper
   3  *
   4  * Copyright (c) 2021
   5  * Written by Alex Bennée <alex.bennee@linaro.org>
   6  *
   7  * SPDX-License-Identifier: GPL-3.0-or-later
   8  */
   9
  10 uintptr_t __semi_call(uintptr_t type, uintptr_t arg0)
  11 {
  12     register uintptr_t t asm("a0") = type;
  13     register uintptr_t a0 asm("a1") = arg0;
  14     asm(".option norvc\n\t"
  15         ".balign 16\n\t"
  16         "slli zero, zero, 0x1f\n\t"
  17         "ebreak\n\t"
  18         "srai zero, zero, 0x7\n\t"
  19         : "=r" (t)
  20         : "r" (t), "r" (a0));
  21     return t;
  22 }