99 lines
2.1 KiB
C
99 lines
2.1 KiB
C
|
/*
|
||
|
|
* 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 inline void callchain_store(struct perf_callchain_entry *entry, u64 ip)
|
||
|
|
{
|
||
|
|
if (entry->nr < PERF_MAX_STACK_DEPTH)
|
||
|
|
entry->ip[entry->nr++] = ip;
|
||
|
|
}
|
||
|
|
|
||
|
|
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)
|
||
|
|
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)
|
||
|
|
{
|
||
|
|
callchain_store(entry, PERF_CONTEXT_KERNEL);
|
||
|
|
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);
|
||
|
|
|
||
|
|
if (!current || current->pid == 0)
|
||
|
|
return;
|
||
|
|
|
||
|
|
if (is_user && current->state != TASK_RUNNING)
|
||
|
|
return;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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;
|
||
|
|
}
|