1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Performance event callchain support - SuperH architecture code 4 * 5 * Copyright (C) 2009 Paul Mundt 6 */ 7 #include <linux/kernel.h> 8 #include <linux/sched.h> 9 #include <linux/perf_event.h> 10 #include <linux/percpu.h> 11 #include <asm/unwinder.h> 12 #include <asm/ptrace.h> 13 14 static int callchain_stack(void *data, char *name) 15 { 16 return 0; 17 } 18 19 static void callchain_address(void *data, unsigned long addr, int reliable) 20 { 21 struct perf_callchain_entry_ctx *entry = data; 22 23 if (reliable) 24 perf_callchain_store(entry, addr); 25 } 26 27 static const struct stacktrace_ops callchain_ops = { 28 .stack = callchain_stack, 29 .address = callchain_address, 30 }; 31 32 void 33 perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) 34 { 35 perf_callchain_store(entry, regs->pc); 36 37 unwind_stack(NULL, regs, NULL, &callchain_ops, entry); 38 } 39