tests/tcg/arm/semicall.h

   1 /*
   2  * Semihosting Tests - ARM Helper
   3  *
   4  * Copyright (c) 2019
   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("r0") = type;
  13     register uintptr_t a0 asm("r1") = arg0;
  14 #ifdef __thumb__
  15 #  define SVC  "svc 0xab"
  16 #else
  17 #  define SVC  "svc 0x123456"
  18 #endif
  19     asm(SVC : "=r" (t)
  20         : "r" (t), "r" (a0));
  21     return t;
  22 }