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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [testsuite/] [gdb.arch/] [thumb-prologue.c] - Blame information for rev 24

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1 24 jeremybenn 
/* Unwinder test program.
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   Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
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   This file is part of GDB.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
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void tpcs_frame (void);
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int
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main (void)
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{
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  tpcs_frame ();
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  return 0;
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}
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/* Normally Thumb functions use r7 as the frame pointer.  However,
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   with the GCC option -mtpcs-frame, they may use fp instead.  Make
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   sure that the prologue analyzer can handle this.  */
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asm(".text\n"
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    "   .align 2\n"
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    "   .thumb_func\n"
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    "   .code 16\n"
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    "tpcs_frame_1:\n"
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    "   sub     sp, #16\n"
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    "   push    {r7}\n"
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    "   add     r7, sp, #20\n"
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    "   str     r7, [sp, #8]\n"
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    "   mov     r7, pc\n"
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    "   str     r7, [sp, #16]\n"
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    "   mov     r7, fp\n"
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    "   str     r7, [sp, #4]\n"
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    "   mov     r7, lr\n"
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    "   str     r7, [sp, #12]\n"
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    "   add     r7, sp, #16\n"
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    "   mov     fp, r7\n"
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    "   mov     r7, sl\n"
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    "   push    {r7}\n"
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    /* We'll set a breakpoint at this call.  We can't hardcode a trap
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       instruction; the right instruction to use varies too much.  And
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       we can't use a global label, because GDB will think that's the
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       start of a new function.  So, this slightly convoluted
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       technique.  */
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    ".Ltpcs:\n"
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    "   nop\n"
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    "   pop     {r2}\n"
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    "   mov     sl, r2\n"
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    "   pop     {r7}\n"
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    "   pop     {r1, r2}\n"
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    "   mov     fp, r1\n"
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    "   mov     sp, r2\n"
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    "   bx      lr\n"
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    "   .align 2\n"
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    "   .type tpcs_offset, %object\n"
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    "tpcs_offset:\n"
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    "   .word .Ltpcs - tpcs_frame_1\n"
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    "   .align 2\n"
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    "   .thumb_func\n"
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    "   .code 16\n"
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    "tpcs_frame:\n"
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    "   sub     sp, #16\n"
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    "   push    {r7}\n"
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    "   add     r7, sp, #20\n"
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    "   str     r7, [sp, #8]\n"
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    "   mov     r7, pc\n"
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    "   str     r7, [sp, #16]\n"
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    "   mov     r7, fp\n"
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    "   str     r7, [sp, #4]\n"
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    "   mov     r7, lr\n"
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    "   str     r7, [sp, #12]\n"
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    "   add     r7, sp, #16\n"
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    "   mov     fp, r7\n"
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    "   mov     r7, sl\n"
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    "   push    {r7}\n"
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    /* Clobber saved regs around the call.  */
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    "   mov     r7, #0\n"
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    "   mov     lr, r7\n"
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    "   bl      tpcs_frame_1\n"
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    "   pop     {r2}\n"
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    "   mov     sl, r2\n"
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    "   pop     {r7}\n"
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    "   pop     {r1, r2, r3}\n"
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    "   mov     fp, r1\n"
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    "   mov     sp, r2\n"
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    "   mov     lr, r3\n"
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    "   bx      lr\n"
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