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[/] [openrisc/] [tags/] [gdb/] [gdb-6.8/] [gdb-6.8.openrisc-2.1/] [gdb/] [testsuite/] [gdb.arch/] [thumb-prologue.c] - Rev 33
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/* Unwinder test program. Copyright 2006, 2007, 2008 Free Software Foundation, Inc. This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ void tpcs_frame (void); int main (void) { tpcs_frame (); return 0; } /* Normally Thumb functions use r7 as the frame pointer. However, with the GCC option -mtpcs-frame, they may use fp instead. Make sure that the prologue analyzer can handle this. */ asm(".text\n" " .align 2\n" " .thumb_func\n" " .code 16\n" "tpcs_frame_1:\n" " sub sp, #16\n" " push {r7}\n" " add r7, sp, #20\n" " str r7, [sp, #8]\n" " mov r7, pc\n" " str r7, [sp, #16]\n" " mov r7, fp\n" " str r7, [sp, #4]\n" " mov r7, lr\n" " str r7, [sp, #12]\n" " add r7, sp, #16\n" " mov fp, r7\n" " mov r7, sl\n" " push {r7}\n" /* We'll set a breakpoint at this call. We can't hardcode a trap instruction; the right instruction to use varies too much. And we can't use a global label, because GDB will think that's the start of a new function. So, this slightly convoluted technique. */ ".Ltpcs:\n" " nop\n" " pop {r2}\n" " mov sl, r2\n" " pop {r7}\n" " pop {r1, r2}\n" " mov fp, r1\n" " mov sp, r2\n" " bx lr\n" " .align 2\n" " .type tpcs_offset, %object\n" "tpcs_offset:\n" " .word .Ltpcs - tpcs_frame_1\n" " .align 2\n" " .thumb_func\n" " .code 16\n" "tpcs_frame:\n" " sub sp, #16\n" " push {r7}\n" " add r7, sp, #20\n" " str r7, [sp, #8]\n" " mov r7, pc\n" " str r7, [sp, #16]\n" " mov r7, fp\n" " str r7, [sp, #4]\n" " mov r7, lr\n" " str r7, [sp, #12]\n" " add r7, sp, #16\n" " mov fp, r7\n" " mov r7, sl\n" " push {r7}\n" /* Clobber saved regs around the call. */ " mov r7, #0\n" " mov lr, r7\n" " bl tpcs_frame_1\n" " pop {r2}\n" " mov sl, r2\n" " pop {r7}\n" " pop {r1, r2, r3}\n" " mov fp, r1\n" " mov sp, r2\n" " mov lr, r3\n" " bx lr\n" );