gdb/testsuite/gdb.arch/amd64-pseudo-unwind-asm.S

   1 /* Copyright 2018-2024 Free Software Foundation, Inc.
   2
   3    This file is part of GDB.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 .section .note.GNU-stack,"",%progbits
  19
  20 .text
  21 .global callee
  22 callee:
  23         /* Standard prologue.  */
  24 .cfi_startproc
  25         push %rbp
  26 .cfi_def_cfa rbp, 16
  27         mov %rsp, %rbp
  28
  29         /* Save caller's rbx value on the stack.  */
  30 .cfi_offset rbx, -24
  31         push %rbx
  32
  33         /* Put our own rbx value.  */
  34         mov $0x2021222324252627, %rbx
  35 break_here_asm:
  36
  37         /* Restore caller's rbx value.  */
  38         pop %rbx
  39
  40         /* Standard epilogue.  */
  41         pop %rbp
  42         ret
  43 .cfi_endproc
  44
  45
  46 .global caller
  47 caller:
  48 .cfi_startproc
  49         /* Standard prologue.  */
  50         push %rbp
  51 .cfi_def_cfa_offset 16
  52         mov %rsp, %rbp
  53
  54         /* Put our own rbx value.  */
  55         mov $0x1011121314151617, %rbx
  56
  57         /* Call callee.  */
  58         call callee
  59
  60         /* Store our rbx value in rax to return it.  */
  61         mov %rbx, %rax
  62
  63         /* Standard epilogue.  */
  64         pop %rbp
  65         ret
  66 .cfi_endproc