91 lines
2.0 KiB
C
91 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* perf_hooks.c
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*
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* Copyright (C) 2016 Wang Nan <wangnan0@huawei.com>
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* Copyright (C) 2016 Huawei Inc.
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*/
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <setjmp.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include "util/debug.h"
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#include "util/perf-hooks.h"
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static sigjmp_buf jmpbuf;
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static const struct perf_hook_desc *current_perf_hook;
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void perf_hooks__invoke(const struct perf_hook_desc *desc)
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{
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if (!(desc && desc->p_hook_func && *desc->p_hook_func))
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return;
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if (sigsetjmp(jmpbuf, 1)) {
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pr_warning("Fatal error (SEGFAULT) in perf hook '%s'\n",
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desc->hook_name);
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*(current_perf_hook->p_hook_func) = NULL;
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} else {
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current_perf_hook = desc;
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(**desc->p_hook_func)(desc->hook_ctx);
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}
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current_perf_hook = NULL;
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}
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void perf_hooks__recover(void)
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{
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if (current_perf_hook)
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siglongjmp(jmpbuf, 1);
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}
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#define PERF_HOOK(name) \
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perf_hook_func_t __perf_hook_func_##name = NULL; \
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struct perf_hook_desc __perf_hook_desc_##name = \
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{.hook_name = #name, \
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.p_hook_func = &__perf_hook_func_##name, \
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.hook_ctx = NULL};
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#include "perf-hooks-list.h"
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#undef PERF_HOOK
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#define PERF_HOOK(name) \
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&__perf_hook_desc_##name,
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static struct perf_hook_desc *perf_hooks[] = {
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#include "perf-hooks-list.h"
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};
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#undef PERF_HOOK
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int perf_hooks__set_hook(const char *hook_name,
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perf_hook_func_t hook_func,
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void *hook_ctx)
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{
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(perf_hooks); i++) {
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if (strcmp(hook_name, perf_hooks[i]->hook_name) != 0)
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continue;
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if (*(perf_hooks[i]->p_hook_func))
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pr_warning("Overwrite existing hook: %s\n", hook_name);
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*(perf_hooks[i]->p_hook_func) = hook_func;
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perf_hooks[i]->hook_ctx = hook_ctx;
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return 0;
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}
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return -ENOENT;
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}
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perf_hook_func_t perf_hooks__get_hook(const char *hook_name)
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{
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(perf_hooks); i++) {
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if (strcmp(hook_name, perf_hooks[i]->hook_name) != 0)
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continue;
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return *(perf_hooks[i]->p_hook_func);
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}
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return ERR_PTR(-ENOENT);
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}
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