perf_event.c

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Performance event support for parisc
 4 *
 5 * Copyright (C) 2025 by Helge Deller <deller@gmx.de>
 6 */
 7
 8#include <linux/kernel.h>
 9#include <linux/perf_event.h>
10#include <asm/unwind.h>
11
12void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
13			   struct pt_regs *regs)
14{
15
16	struct unwind_frame_info info;
17
18	unwind_frame_init_task(&info, current, NULL);
19	while (1) {
20		if (unwind_once(&info) < 0 || info.ip == 0)
21			break;
22
23		if (!__kernel_text_address(info.ip) ||
24			perf_callchain_store(entry, info.ip))
25				return;
26	}
27}