gdb/testsuite/gdb.arch/aarch64-unwind-pc.S

   1 /* Copyright 2022-2023 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         .text
  19         .globl main
  20         .type main,#function
  21 main:
  22         .cfi_startproc
  23         stp     x29, x30, [sp, -16]!
  24         .cfi_def_cfa sp, 16
  25         .cfi_offset x29, 0
  26         .cfi_offset x30, 8
  27         bl test_func
  28         ldp     x29, x30, [sp], 16
  29         .cfi_restore x29
  30         .cfi_restore x30
  31         .cfi_def_cfa sp, 0
  32         mov     x0, 0
  33         ret
  34         .cfi_endproc
  35
  36         .globl test_func
  37 test_func:
  38         .cfi_startproc
  39         // Unwind x30 to a different value
  40         // CFA_val_expression x30 const2u 0x1234
  41         .cfi_escape 0x16, 30, 0x03, 0x0a, 0x34, 0x12
  42         // CFA_val_expression pc breg30 0
  43         .cfi_escape 0x16, 32, 0x02, 0x8e, 0x00
  44         mov     x0, x30
  45         .cfi_register 32, x0
  46         mov     x30, 0x1234
  47         ret     x0
  48         .cfi_endproc
  49         .section        .note.GNU-stack,"",@progbits