Kari Argillander
cb243c36a8
* Change MIT license texts to SPDX-License-Identifier SPDX-License-Identifier is much easier to understand and grep than license text so use that instead. * Change GPL exception license texts to SPDX-License-Identifier SPDX-License-Identifier is much easier to understand and grep than license text so use that instead. * Change misc license texts to SPDX-License-Identifier There are some external code in repo which are not licenses as most of the stuff in this repo. We still want every file to have SPDX identifier to easily grep licenses. * Add currently used license files Even though Bacnet-Stack is using SPDX identifiers we still need to give those license files with source. For this reason add all license files to license/ folder. SPDX has also files which would make same thing but this is style which example Linux kernel is using and it is quite clear so I choose that one for now. I choosed not yet bring CC-PDDC as that is not right license for those files. --------- Co-authored-by: Kari Argillander <kari.argillander@fidelix.com>
89 lines
1.7 KiB
C
89 lines
1.7 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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* SPDX-License-Identifier: MIT
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*
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*********************************************************************/
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#include "hardware.h"
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/* me */
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#include "stack.h"
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#if defined(__GNUC__)
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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_init(void) __attribute__((naked)) __attribute__((section(".init1")));
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void stack_init(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(" ldi r30,lo8(_end)\n"
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" ldi r31,hi8(_end)\n"
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" ldi r24,lo8(0xc5)\n" /* STACK_CANARY = 0xc5 */
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" ldi r25,hi8(__stack)\n"
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" rjmp .cmp\n"
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".loop:\n"
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" st Z+,r24\n"
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".cmp:\n"
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" cpi r30,lo8(__stack)\n"
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" cpc r31,r25\n"
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" brlo .loop\n"
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" breq .loop" ::);
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#endif
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}
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unsigned stack_size(void)
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{
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return (&__stack) - (&_end);
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}
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uint8_t stack_byte(unsigned offset)
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{
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return *(&_end + offset);
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}
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unsigned stack_unused(void)
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{
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uint8_t *p = &_end;
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unsigned count = 0;
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while (p <= &__stack) {
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if ((*p) != STACK_CANARY) {
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count = p - (&_end);
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break;
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}
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p++;
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}
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return count;
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}
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#else
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void stack_init(void)
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{
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}
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unsigned stack_size(void)
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{
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return 0;
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}
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uint8_t stack_byte(unsigned offset)
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{
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return 0;
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}
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unsigned stack_unused(void)
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{
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return 0;
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}
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#endif
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