skarg
53 lines
2.0 KiB
C
53 lines
2.0 KiB
C
/**************************************************************************
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*
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* Copyright (C) 2009 Steve Karg <skarg@users.sourceforge.net>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*********************************************************************/
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#include "hardware.h"
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/* stack checking */
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extern uint8_t _end;
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extern uint8_t __stack;
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#define STACK_CANARY (0xC5)
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void stack_paint(
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void) __attribute__ ((naked)) __attribute__ ((section(".init1")));
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void stack_paint(
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void)
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{
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#if 0
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uint8_t *p = &_end;
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while (p <= &__stack) {
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*p = STACK_CANARY;
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p++;
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}
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#else
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__asm volatile (
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" ldi r30,lo8(_end)\n" " ldi r31,hi8(_end)\n" " ldi r24,lo8(0xc5)\n" /* STACK_CANARY = 0xc5 */
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" ldi r25,hi8(__stack)\n" " rjmp .cmp\n" ".loop:\n"
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" st Z+,r24\n" ".cmp:\n" " cpi r30,lo8(__stack)\n"
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" cpc r31,r25\n" " brlo .loop\n" " breq .loop"::);
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#endif
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}
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