1 /* 2 * Performance event callchain support - SuperH architecture code 3 * 4 * Copyright (C) 2009 Paul Mundt 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file "COPYING" in the main directory of this archive 8 * for more details. 9 */ 10 #include <linux/kernel.h> 11 #include <linux/sched.h> 12 #include <linux/perf_event.h> 13 #include <linux/percpu.h> 14 #include <asm/unwinder.h> 15 #include <asm/ptrace.h> 16 17 static int callchain_stack(void *data, char *name) 18 { 19 return 0; 20 } 21 22 static void callchain_address(void *data, unsigned long addr, int reliable) 23 { 24 struct perf_callchain_entry *entry = data; 25 26 if (reliable) 27 perf_callchain_store(entry, addr); 28 } 29 30 static const struct stacktrace_ops callchain_ops = { 31 .stack = callchain_stack, 32 .address = callchain_address, 33 }; 34 35 void 36 perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs) 37 { 38 perf_callchain_store(entry, regs->pc); 39 40 unwind_stack(NULL, regs, NULL, &callchain_ops, entry); 41 } 42