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  #include "negated_errno.h"
       9  
      10  static void
      11  arch_get_error(struct tcb *tcp, const bool check_errno)
      12  {
      13  	/*
      14  	 * In X32, return value is 64-bit (llseek uses one).
      15  	 * Using merely "long rax" would not work.
      16  	 */
      17  	long long rax;
      18  
      19  	if (x86_io.iov_len == sizeof(i386_regs)) {
      20  		/* Sign extend from 32 bits */
      21  		rax = (int32_t) i386_regs.eax;
      22  	} else {
      23  		rax = x86_64_regs.rax;
      24  	}
      25  
      26  	if (check_errno && is_negated_errno(rax)) {
      27  		tcp->u_rval = -1;
      28  		tcp->u_error = -rax;
      29  	} else {
      30  		if (x86_io.iov_len == sizeof(i386_regs))
      31  			tcp->u_rval = (uint32_t) rax;
      32  		else
      33  			tcp->u_rval = rax;
      34  	}
      35  }