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https://github.com/zephyrproject-rtos/zephyr
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edf9cc3065
This introduces simple API for analysing stack usage. Stack growth direction is determined on build instead of runtime. Change-Id: Iacb160d088cc0af57e2e9dedc72cbc5e31fd22f4 Signed-off-by: Szymon Janc <ext.szymon.janc@tieto.com>
88 lines
3.0 KiB
C
88 lines
3.0 KiB
C
/**
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* @file stack.h
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* Stack usage analysis helpers
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*/
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/*
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* Copyright (c) 2015 Intel Corporation
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of Intel Corporation nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#if defined(CONFIG_INIT_STACKS) && defined(CONFIG_PRINTK)
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#include <offsets.h>
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#include <misc/printk.h>
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static inline void stack_analyze(const char *name, const char *stack,
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unsigned size)
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{
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unsigned i, stack_offset, pcnt, unused = 0;
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/* The TCS is always placed on a 4-byte aligned boundary - if
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* the stack beginning doesn't match that there will be some
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* unused bytes in the beginning.
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*/
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stack_offset = __tTCS_SIZEOF + ((4 - ((unsigned)stack % 4)) % 4);
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/* TODO
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* Currently all supported platforms have stack growth down and there is no
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* Kconfig option to configure it so this always build "else" branch.
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* When support for platform with stack direction up (or configurable direction)
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* is added this check should be confirmed that correct Kconfig option is used.
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*/
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#if defined(CONFIG_STACK_GROWS_UP)
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for (i = size - 1; i >= stack_offset; i--) {
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if ((unsigned char)stack[i] == 0xaa) {
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unused++;
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} else {
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break;
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}
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}
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#else
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for (i = stack_offset; i < size; i++) {
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if ((unsigned char)stack[i] == 0xaa) {
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unused++;
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} else {
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break;
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}
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}
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#endif
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/* Calculate the real size reserved for the stack */
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size -= stack_offset;
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pcnt = ((size - unused) * 100) / size;
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printk("%s (real size %u):\tunused %u\tusage %u / %u (%u %%)\n", name,
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size + stack_offset, unused, size - unused, size, pcnt);
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}
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#else
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static inline void stack_analyze(const char *name, const char *stack,
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unsigned size)
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{
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}
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#endif
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