gdb/testsuite/gdb.arch/arm-pseudo-unwind-legacy-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 /* The difference between this and arm-pseudo-unwind is that here, the CFI
  19    directives use the obsolete DWARF number for the s16 register (a
  20    pseudo-register in GDB), whereas arm-pseudo-unwind uses the number for the d8
  21    register (the underlying raw register for s16).  */
  22
  23 .section .note.GNU-stack,"",%progbits
  24
  25 .data
  26 value_callee:
  27 .quad 0x20212223
  28 value_caller:
  29 .quad 0x10111213
  30
  31 .text
  32 .arm
  33 .global callee
  34 callee:
  35 .cfi_startproc
  36         /* Standard prologue.  */
  37         push {fp, lr}
  38 .cfi_def_cfa fp, 4
  39 .cfi_offset fp, -8
  40 .cfi_offset lr, -4
  41         add fp, sp, #4
  42
  43         /* Save caller's s16 value on the stack.  */
  44 .cfi_offset 80, -12
  45         vpush {s16}
  46
  47         /* Put our own s16 value.  */
  48         ldr r0, =value_callee
  49         vldr s16, [r0]
  50 break_here_asm:
  51
  52         /* Restore caller's s16 value.  */
  53         vpop {s16}
  54
  55         /* Standard epilogue.  */
  56         pop {fp, pc}
  57 .cfi_endproc
  58
  59
  60 .global caller
  61 caller:
  62 .cfi_startproc
  63         /* Standard prologue.  */
  64         push {fp, lr}
  65 .cfi_def_cfa fp, 4
  66 .cfi_offset fp, -8
  67 .cfi_offset lr, -4
  68         add fp, sp, #4
  69
  70         /* Put our own s16 value.  */
  71         ldr r0, =value_caller
  72         vldr s16, [r0]
  73
  74         /* Call callee.  */
  75         bl callee
  76
  77         /* Store our s16 value in r0-r1 to return it.  */
  78         vpush {s16}
  79         pop {r0}
  80         mov r1, #0
  81
  82         /* Standard epilogue.  */
  83         pop {fp, pc}
  84 .cfi_endproc