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- /*
- * Performance event callchain support - SuperH architecture code
- *
- * Copyright (C) 2009 Paul Mundt
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- */
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/perf_event.h>
- #include <linux/percpu.h>
- #include <asm/unwinder.h>
- #include <asm/ptrace.h>
- static void callchain_warning(void *data, char *msg)
- {
- }
- static void
- callchain_warning_symbol(void *data, char *msg, unsigned long symbol)
- {
- }
- static int callchain_stack(void *data, char *name)
- {
- return 0;
- }
- static void callchain_address(void *data, unsigned long addr, int reliable)
- {
- struct perf_callchain_entry *entry = data;
- if (reliable)
- perf_callchain_store(entry, addr);
- }
- static const struct stacktrace_ops callchain_ops = {
- .warning = callchain_warning,
- .warning_symbol = callchain_warning_symbol,
- .stack = callchain_stack,
- .address = callchain_address,
- };
- static void
- perf_callchain_kernel(struct pt_regs *regs, struct perf_callchain_entry *entry)
- {
- perf_callchain_store(entry, PERF_CONTEXT_KERNEL);
- perf_callchain_store(entry, regs->pc);
- unwind_stack(NULL, regs, NULL, &callchain_ops, entry);
- }
- static void
- perf_do_callchain(struct pt_regs *regs, struct perf_callchain_entry *entry)
- {
- int is_user;
- if (!regs)
- return;
- is_user = user_mode(regs);
- /*
- * Only the kernel side is implemented for now.
- */
- if (!is_user)
- perf_callchain_kernel(regs, entry);
- }
- /*
- * No need for separate IRQ and NMI entries.
- */
- static DEFINE_PER_CPU(struct perf_callchain_entry, callchain);
- struct perf_callchain_entry *perf_callchain(struct pt_regs *regs)
- {
- struct perf_callchain_entry *entry = &__get_cpu_var(callchain);
- entry->nr = 0;
- perf_do_callchain(regs, entry);
- return entry;
- }
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