gdb/testsuite/gdb.arch/i386-pseudo.c

   1 /* Test program for byte registers.
   2
   3    Copyright 2010-2022 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include <stdio.h>
  21
  22 int data[] = {
  23   0x14131211,
  24   0x24232221,
  25   0x34333231,
  26   0x44434241,
  27 };
  28
  29 int
  30 main (int argc, char **argv)
  31 {
  32   register int eax asm ("eax");
  33   register int ebx asm ("ebx");
  34   register int ecx asm ("ecx");
  35   register int edx asm ("edx");
  36
  37   asm ("mov 0(%0), %%eax\n\t"
  38        "mov 4(%0), %%ebx\n\t"
  39        "mov 8(%0), %%ecx\n\t"
  40        "mov 12(%0), %%edx\n\t"
  41        : /* no output operands */
  42        : "r" (data)
  43        : "eax", "ebx", "ecx", "edx");
  44
  45   asm ("nop" /* first breakpoint here */
  46        /* i386-{byte,word}.exp write eax-edx here.
  47           Tell gcc/clang they're live.  */
  48        : "=r" (eax), "=r" (ebx), "=r" (ecx), "=r" (edx)
  49        : /* no inputs */);
  50
  51   asm ("mov %%eax, 0(%0)\n\t"
  52        "mov %%ebx, 4(%0)\n\t"
  53        "mov %%ecx, 8(%0)\n\t"
  54        "mov %%edx, 12(%0)\n\t"
  55        : /* no output operands */
  56        : "r" (data),
  57          /* Mark these as inputs so that gcc/clang won't try to use them as
  58             a temp to build %0.  */
  59          "r" (eax), "r" (ebx), "r" (ecx), "r" (edx));
  60   puts ("Bye!"); /* second breakpoint here */
  61
  62   return 0;
  63 }