qemu

FORK: QEMU emulator
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semicall.h (524B)

      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 }