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 18 static void callchain_warning(void *data, char *msg) 19 { 20 } 21 22 static void 23 callchain_warning_symbol(void *data, char *msg, unsigned long symbol) 24 { 25 } 26 27 static int callchain_stack(void *data, char *name) 28 { 29 return 0; 30 } 31 32 static void callchain_address(void *data, unsigned long addr, int reliable) 33 { 34 struct perf_callchain_entry *entry = data; 35 36 if (reliable) 37 perf_callchain_store(entry, addr); 38 } 39 40 static const struct stacktrace_ops callchain_ops = { 41 .warning = callchain_warning, 42 .warning_symbol = callchain_warning_symbol, 43 .stack = callchain_stack, 44 .address = callchain_address, 45 }; 46 47 void 48 perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs) 49 { 50 perf_callchain_store(entry, regs->pc); 51 52 unwind_stack(NULL, regs, NULL, &callchain_ops, entry); 53 } 54