1  /*
       2   * Raw syscalls.
       3   *
       4   * Copyright (c) 2018-2021 The strace developers.
       5   * All rights reserved.
       6   *
       7   * SPDX-License-Identifier: LGPL-2.1-or-later
       8   */
       9  
      10  #ifndef STRACE_RAW_SYSCALL_H
      11  # define STRACE_RAW_SYSCALL_H
      12  
      13  # include "kernel_types.h"
      14  
      15  static inline kernel_ulong_t
      16  raw_syscall_0(const kernel_ulong_t nr, kernel_ulong_t *err)
      17  {
      18  	*err = 0;
      19  
      20  # ifdef __thumb__ /* && FRAME_POINTERS_ENABLED */
      21  
      22  	register kernel_ulong_t rt;
      23  	register kernel_ulong_t r0 __asm__("r0");
      24  	__asm__ __volatile__("mov %1,r7; mov r7,%2; swi 0x0; mov r7,%1"
      25  			     : "=r"(r0), "=&r"(rt)
      26  			     : "r"(nr)
      27  			     : "memory");
      28  
      29  # else
      30  
      31  	register kernel_ulong_t r7 __asm__("r7") = nr;
      32  	register kernel_ulong_t r0 __asm__("r0");
      33  	__asm__ __volatile__("swi 0x0"
      34  			     : "=r"(r0)
      35  			     : "r"(r7)
      36  			     : "memory");
      37  
      38  # endif
      39  
      40  	return r0;
      41  }
      42  # define raw_syscall_0 raw_syscall_0
      43  
      44  #endif /* !STRACE_RAW_SYSCALL_H */