gdb/testsuite/gdb.arch/amd64-disp-step.S

   1 /* Copyright 2009-2014 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         .global test_call
  31 test_call:
  32         call test_call_subr
  33         nop
  34         .global test_ret_end
  35 test_ret_end:
  36         nop
  37
  38 /***********************************************/
  39
  40 /* test abs-jmp/rep-ret */
  41
  42 test_abs_jmp_setup:
  43         mov $test_abs_jmp_return,%rdx
  44         push %rdx
  45         mov $test_abs_jmp_subr,%rdx
  46         .global test_abs_jmp
  47 test_abs_jmp:
  48         jmp *%rdx
  49 test_abs_jmp_return:
  50         nop
  51         .global test_rep_ret_end
  52 test_rep_ret_end:
  53         nop
  54
  55 /***********************************************/
  56
  57 /* test syscall */
  58
  59         .global test_syscall
  60         mov $0x27,%eax /* getpid */
  61 test_syscall:
  62         syscall
  63         nop
  64 test_syscall_end:
  65         nop
  66
  67 /***********************************************/
  68
  69 /* Test stepping over int3.
  70    The prefixes are pointless, but it's possible, so we exercise it.  */
  71
  72         nop
  73         .global test_int3
  74 test_int3:
  75         repz
  76         repz
  77         int3
  78         nop
  79         .global test_int3_end
  80 test_int3_end:
  81         nop
  82
  83 /***********************************************/
  84
  85 /* test rip-relative
  86    GDB picks a spare register to hold the rip-relative address.
  87    Exercise all the possibilities (rax-rdi, sans rsp).  */
  88
  89         .global test_rip_rax
  90 test_rip_rax:
  91         add answer(%rip),%rax
  92         .global test_rip_rax_end
  93 test_rip_rax_end:
  94         nop
  95
  96         .global test_rip_rbx
  97 test_rip_rbx:
  98         add answer(%rip),%rbx
  99         .global test_rip_rbx_end
 100 test_rip_rbx_end:
 101         nop
 102
 103         .global test_rip_rcx
 104 test_rip_rcx:
 105         add answer(%rip),%rcx
 106         .global test_rip_rcx_end
 107 test_rip_rcx_end:
 108         nop
 109
 110         .global test_rip_rdx
 111 test_rip_rdx:
 112         add answer(%rip),%rdx
 113         .global test_rip_rdx_end
 114 test_rip_rdx_end:
 115         nop
 116
 117         .global test_rip_rbp
 118 test_rip_rbp:
 119         add answer(%rip),%rbp
 120         .global test_rip_rbp_end
 121 test_rip_rbp_end:
 122         nop
 123
 124         .global test_rip_rsi
 125 test_rip_rsi:
 126         add answer(%rip),%rsi
 127         .global test_rip_rsi_end
 128 test_rip_rsi_end:
 129         nop
 130
 131         .global test_rip_rdi
 132 test_rip_rdi:
 133         add answer(%rip),%rdi
 134         .global test_rip_rdi_end
 135 test_rip_rdi_end:
 136         nop
 137
 138         /* skip over test data */
 139         jmp done
 140
 141 /* test rip-relative data */
 142
 143 answer: .8byte 42
 144
 145 /***********************************************/
 146
 147 /* all done */
 148
 149 done:
 150         mov $0,%rdi
 151         call exit
 152         hlt
 153
 154 /***********************************************/
 155
 156 /* subroutine to help test call/ret */
 157
 158 test_call_subr:
 159         nop
 160         .global test_call_end
 161 test_call_end:
 162         nop
 163
 164         .global test_ret
 165 test_ret:
 166         ret
 167
 168 /***********************************************/
 169
 170 /* subroutine to help test abs-jmp/rep-ret */
 171
 172 test_abs_jmp_subr:
 173         nop
 174         .global test_abs_jmp_end
 175 test_abs_jmp_end:
 176         nop
 177
 178         .global test_rep_ret
 179 test_rep_ret:
 180         repz
 181         ret