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

   1 /* Copyright 2009 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 /* test call/ret */
  27
  28         .global test_call
  29 test_call:
  30         call test_call_subr
  31         nop
  32         .global test_ret_end
  33 test_ret_end:
  34         nop
  35
  36 /* test abs-jmp/rep-ret */
  37
  38 test_abs_jmp_setup:
  39         mov $test_abs_jmp_return,%rdx
  40         push %rdx
  41         mov $test_abs_jmp_subr,%rdx
  42         .global test_abs_jmp
  43 test_abs_jmp:
  44         jmp *%rdx
  45 test_abs_jmp_return:
  46         nop
  47         .global test_rep_ret_end
  48 test_rep_ret_end:
  49         nop
  50
  51 /* test syscall */
  52
  53         .global test_syscall
  54         mov $0x27,%eax /* getpid */
  55 test_syscall:
  56         syscall
  57         nop
  58 test_syscall_end:
  59         nop
  60
  61 /* test rip-relative
  62    GDB picks a spare register to hold the rip-relative address.
  63    Exercise all the possibilities (rax-rdi, sans rsp).  */
  64
  65         .global test_rip_rax
  66 test_rip_rax:
  67         add answer(%rip),%rax
  68         .global test_rip_rax_end
  69 test_rip_rax_end:
  70         nop
  71
  72         .global test_rip_rbx
  73 test_rip_rbx:
  74         add answer(%rip),%rbx
  75         .global test_rip_rbx_end
  76 test_rip_rbx_end:
  77         nop
  78
  79         .global test_rip_rcx
  80 test_rip_rcx:
  81         add answer(%rip),%rcx
  82         .global test_rip_rcx_end
  83 test_rip_rcx_end:
  84         nop
  85
  86         .global test_rip_rdx
  87 test_rip_rdx:
  88         add answer(%rip),%rdx
  89         .global test_rip_rdx_end
  90 test_rip_rdx_end:
  91         nop
  92
  93         .global test_rip_rbp
  94 test_rip_rbp:
  95         add answer(%rip),%rbp
  96         .global test_rip_rbp_end
  97 test_rip_rbp_end:
  98         nop
  99
 100         .global test_rip_rsi
 101 test_rip_rsi:
 102         add answer(%rip),%rsi
 103         .global test_rip_rsi_end
 104 test_rip_rsi_end:
 105         nop
 106
 107         .global test_rip_rdi
 108 test_rip_rdi:
 109         add answer(%rip),%rdi
 110         .global test_rip_rdi_end
 111 test_rip_rdi_end:
 112         nop
 113
 114         /* skip over test data */
 115         jmp done
 116
 117 /* test rip-relative data */
 118
 119 answer: .8byte 42
 120
 121 /* all done */
 122
 123 done:
 124         mov $0,%rdi
 125         call exit
 126         hlt
 127
 128 /***********************************************/
 129
 130 /* subroutine to help test call/ret */
 131
 132 test_call_subr:
 133         nop
 134         .global test_call_end
 135 test_call_end:
 136         nop
 137
 138         .global test_ret
 139 test_ret:
 140         ret
 141
 142 /* subroutine to help test abs-jmp/rep-ret */
 143
 144 test_abs_jmp_subr:
 145         nop
 146         .global test_abs_jmp_end
 147 test_abs_jmp_end:
 148         nop
 149
 150         .global test_rep_ret
 151 test_rep_ret:
 152         repz
 153         ret