gdb/testsuite/gdb.arch/thumb-prologue.c

   1 /* Unwinder test program.
   2
   3    Copyright 2006, 2007 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 void tpcs_frame (void);
  23
  24 int
  25 main (void)
  26 {
  27   tpcs_frame ();
  28   return 0;
  29 }
  30
  31 /* Normally Thumb functions use r7 as the frame pointer.  However,
  32    with the GCC option -mtpcs-frame, they may use fp instead.  */
  33
  34 asm(".text\n"
  35     "   .align 2\n"
  36     "   .thumb_func\n"
  37     "   .code 16\n"
  38     "tpcs_frame_1:\n"
  39     "   sub     sp, #16\n"
  40     "   push    {r7}\n"
  41     "   add     r7, sp, #20\n"
  42     "   str     r7, [sp, #8]\n"
  43     "   mov     r7, pc\n"
  44     "   str     r7, [sp, #16]\n"
  45     "   mov     r7, fp\n"
  46     "   str     r7, [sp, #4]\n"
  47     "   mov     r7, lr\n"
  48     "   str     r7, [sp, #12]\n"
  49     "   add     r7, sp, #16\n"
  50     "   mov     fp, r7\n"
  51     "   mov     r7, sl\n"
  52     "   push    {r7}\n"
  53
  54     /* Trap.  */
  55     "   .short  0xdffe\n"
  56
  57     "   pop     {r2}\n"
  58     "   mov     sl, r2\n"
  59     "   pop     {r7}\n"
  60     "   pop     {r1, r2}\n"
  61     "   mov     fp, r1\n"
  62     "   mov     sp, r2\n"
  63     "   bx      lr\n"
  64
  65     "   .align 2\n"
  66     "   .thumb_func\n"
  67     "   .code 16\n"
  68     "tpcs_frame:\n"
  69     "   sub     sp, #16\n"
  70     "   push    {r7}\n"
  71     "   add     r7, sp, #20\n"
  72     "   str     r7, [sp, #8]\n"
  73     "   mov     r7, pc\n"
  74     "   str     r7, [sp, #16]\n"
  75     "   mov     r7, fp\n"
  76     "   str     r7, [sp, #4]\n"
  77     "   mov     r7, lr\n"
  78     "   str     r7, [sp, #12]\n"
  79     "   add     r7, sp, #16\n"
  80     "   mov     fp, r7\n"
  81     "   mov     r7, sl\n"
  82     "   push    {r7}\n"
  83
  84     /* Clobber saved regs.  */
  85     "   mov     r7, #0\n"
  86     "   mov     lr, r7\n"
  87     "   bl      tpcs_frame_1\n"
  88
  89     "   pop     {r2}\n"
  90     "   mov     sl, r2\n"
  91     "   pop     {r7}\n"
  92     "   pop     {r1, r2}\n"
  93     "   mov     fp, r1\n"
  94     "   mov     sp, r2\n"
  95     "   bx      lr\n"
  96 );