74 lines
2.1 KiB
C
74 lines
2.1 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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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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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