1  /*
       2   * Copyright (c) 2015-2021 The strace developers.
       3   * All rights reserved.
       4   *
       5   * SPDX-License-Identifier: LGPL-2.1-or-later
       6   */
       7  
       8  static void
       9  arch_get_error(struct tcb *tcp, const bool check_errno)
      10  {
      11  	/*
      12  	 * The system call convention specifies that r2 contains the return
      13  	 * value on success or a positive error number on failure.  A flag
      14  	 * indicating successful completion is written to r7; r7=0 indicates
      15  	 * the system call success, r7=1 indicates an error.  The positive
      16  	 * errno value written in r2.
      17  	 */
      18  	if (nios2_regs.regs[7]) {
      19  		tcp->u_rval = -1;
      20  		tcp->u_error = nios2_regs.regs[2];
      21  	} else {
      22  		tcp->u_rval = nios2_regs.regs[2];
      23  	}
      24  }