tests/tcg/arm/semicall.h

   1 /*
   2  * Semihosting Tests
   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 #define SYS_WRITE0      0x04
  11 #define SYS_READC       0x07
  12 #define SYS_REPORTEXC   0x18
  13
  14 uintptr_t __semi_call(uintptr_t type, uintptr_t arg0)
  15 {
  16 #if defined(__arm__)
  17     register uintptr_t t asm("r0") = type;
  18     register uintptr_t a0 asm("r1") = arg0;
  19 #ifdef __thumb__
  20 #  define SVC  "svc 0xab"
  21 #else
  22 #  define SVC  "svc 0x123456"
  23 #endif
  24     asm(SVC : "=r" (t)
  25         : "r" (t), "r" (a0));
  26 #else
  27     register uintptr_t t asm("x0") = type;
  28     register uintptr_t a0 asm("x1") = arg0;
  29     asm("hlt 0xf000"
  30         : "=r" (t)
  31         : "r" (t), "r" (a0));
  32 #endif
  33
  34     return t;
  35 }