gdb/testsuite/gdb.arch/i386-disp-step.S

   1 /* Copyright 2009-2021 Free Software Foundation, Inc.
   2
   3    This program is free software; you can redistribute it and/or modify
   4    it under the terms of the GNU General Public License as published by
   5    the Free Software Foundation; either version 3 of the License, or
   6    (at your option) any later version.
   7
   8    This program is distributed in the hope that it will be useful,
   9    but WITHOUT ANY WARRANTY; without even the implied warranty of
  10    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11    GNU General Public License for more details.
  12
  13    You should have received a copy of the GNU General Public License
  14    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15
  16    This file is part of the gdb testsuite.
  17    It tests displaced stepping over various insns that require special
  18    handling.  */
  19
  20         .text
  21
  22         .global main
  23 main:
  24         nop
  25
  26 /***********************************************/
  27
  28 /* Test call/ret.  */
  29
  30         nop
  31         .global test_call
  32 test_call:
  33         call test_call_subr
  34         nop
  35         .global test_ret_end
  36 test_ret_end:
  37         nop
  38
  39 /***********************************************/
  40
  41 /* Absolute jump with leading prefixes.
  42    These don't occur in normal code, but gdb should still DTRT.  */
  43
  44         nop
  45         .global test_prefixed_abs_jump
  46 test_prefixed_abs_jump:
  47         ds
  48         jmp *test_prefixed_abs_jump_addr
  49         .data
  50 test_prefixed_abs_jump_addr:
  51         .4byte test_prefixed_abs_jump_target
  52         .text
  53 test_prefixed_abs_jump_target:
  54         nop
  55         .global test_prefixed_abs_jump_end
  56 test_prefixed_abs_jump_end:
  57         nop
  58
  59 /***********************************************/
  60
  61 /* Test syscall.  */
  62
  63         mov $0x14,%eax /* getpid */
  64         .global test_syscall
  65 test_syscall:
  66         int $0x80
  67         nop
  68         .global test_syscall_end
  69 test_syscall_end:
  70         nop
  71
  72 /***********************************************/
  73
  74 /* Test syscall again, this time with a prefix.
  75    These don't occur in normal code, but gdb should still DTRT.  */
  76
  77         mov $0x14,%eax /* getpid */
  78         .global test_prefixed_syscall
  79 test_prefixed_syscall:
  80         repnz
  81         int $0x80
  82         nop
  83         .global test_prefixed_syscall_end
  84 test_prefixed_syscall_end:
  85         nop
  86
  87 /***********************************************/
  88
  89 /* Test stepping over int3.
  90    The prefixes are pointless, but it's possible, so we exercise it.  */
  91
  92         nop
  93         .global test_int3
  94 test_int3:
  95         repz
  96         repz
  97         int3
  98         nop
  99         .global test_int3_end
 100 test_int3_end:
 101         nop
 102
 103 /***********************************************/
 104
 105 /* all done */
 106
 107         pushl $0
 108         call exit
 109         hlt
 110
 111 /***********************************************/
 112
 113 /* subroutine to help test call/ret */
 114
 115 test_call_subr:
 116         nop
 117         .global test_call_end
 118 test_call_end:
 119         nop
 120
 121         .global test_ret
 122 test_ret:
 123         ret