46aa6717ff
Mostly a revert of commit b1def7145f ("arch: deprecate `_current`").
This commit was part of PR #80716 whose initial purpose was about providing
an architecture specific optimization for _current. The actual deprecation
was sneaked in later on without proper discussion.
The Zephyr core always used _current before and that was fine. It is quite
prevalent as well and the alternative is proving rather verbose.
Furthermore, as a concept, the "current thread" is not something that is
necessarily architecture specific. Therefore the primary abstraction
should not carry the arch_ prefix.
Hence this revert.
Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
/*
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* Copyright (c) 2023 KNS Group LLC (YADRO)
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* Copyright (c) 2020 Yonatan Goldschmidt <yon.goldschmidt@gmail.com>
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/kernel.h>
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static bool valid_stack(uintptr_t addr, k_tid_t current)
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{
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return current->stack_info.start <= addr &&
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addr < current->stack_info.start + current->stack_info.size;
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}
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static inline bool in_text_region(uintptr_t addr)
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{
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extern uintptr_t __text_region_start, __text_region_end;
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return (addr >= (uintptr_t)&__text_region_start) && (addr < (uintptr_t)&__text_region_end);
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}
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/*
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* This function use frame pointers to unwind stack and get trace of return addresses.
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* Return addresses are translated in corresponding function's names using .elf file.
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* So we get function call trace
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*/
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size_t arch_perf_current_stack_trace(uintptr_t *buf, size_t size)
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{
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if (size < 1U) {
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return 0;
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}
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size_t idx = 0;
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/*
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* In x86_64 (arch/x86/core/intel64/locore.S) %rip and %rbp
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* are always saved in _current->callee_saved before calling
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* handler function if interrupt is not nested
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*
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* %rip points the location where interrupt was occurred
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*/
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buf[idx++] = (uintptr_t)_current->callee_saved.rip;
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void **fp = (void **)_current->callee_saved.rbp;
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/*
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* %rbp is frame pointer.
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*
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* stack frame in memory:
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* (addresses growth up)
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* ....
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* ra
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* %rbp (next) <- %rbp (curr)
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* ....
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*/
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while (valid_stack((uintptr_t)fp, _current)) {
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if (idx >= size) {
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return 0;
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}
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if (!in_text_region((uintptr_t)fp[1])) {
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break;
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}
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buf[idx++] = (uintptr_t)fp[1];
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void **new_fp = (void **)fp[0];
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/*
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* anti-infinity-loop if
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* new_fp can't be smaller than fp, cause the stack is growing down
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* and trace moves deeper into the stack
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*/
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if (new_fp <= fp) {
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break;
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}
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fp = new_fp;
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}
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return idx;
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}
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