74 строки
1.8 KiB
C
74 строки
1.8 KiB
C
#include <linux/init.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/types.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
#define SAMPLE_BUFFER_SIZE 8192
|
|
|
|
static char* sample_buffer;
|
|
static char* sample_buffer_pos;
|
|
static int prof_running = 0;
|
|
|
|
void
|
|
cris_profile_sample(struct pt_regs* regs)
|
|
{
|
|
if (!prof_running)
|
|
return;
|
|
if (user_mode(regs))
|
|
*(unsigned int*)sample_buffer_pos = current->pid;
|
|
else
|
|
*(unsigned int*)sample_buffer_pos = 0;
|
|
*(unsigned int*)(sample_buffer_pos + 4) = instruction_pointer(regs);
|
|
sample_buffer_pos += 8;
|
|
if (sample_buffer_pos == sample_buffer + SAMPLE_BUFFER_SIZE)
|
|
sample_buffer_pos = sample_buffer;
|
|
}
|
|
|
|
static ssize_t
|
|
read_cris_profile(struct file *file, char __user *buf, size_t count, loff_t *ppos)
|
|
{
|
|
unsigned long p = *ppos;
|
|
if (p > SAMPLE_BUFFER_SIZE)
|
|
return 0;
|
|
if (p + count > SAMPLE_BUFFER_SIZE)
|
|
count = SAMPLE_BUFFER_SIZE - p;
|
|
if (copy_to_user(buf, sample_buffer + p,count))
|
|
return -EFAULT;
|
|
memset(sample_buffer + p, 0, count);
|
|
*ppos += count;
|
|
return count;
|
|
}
|
|
|
|
static ssize_t
|
|
write_cris_profile(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
sample_buffer_pos = sample_buffer;
|
|
memset(sample_buffer, 0, SAMPLE_BUFFER_SIZE);
|
|
}
|
|
|
|
static const struct file_operations cris_proc_profile_operations = {
|
|
.read = read_cris_profile,
|
|
.write = write_cris_profile,
|
|
};
|
|
|
|
static int
|
|
__init init_cris_profile(void)
|
|
{
|
|
struct proc_dir_entry *entry;
|
|
sample_buffer = kmalloc(SAMPLE_BUFFER_SIZE, GFP_KERNEL);
|
|
sample_buffer_pos = sample_buffer;
|
|
entry = create_proc_entry("system_profile", S_IWUSR | S_IRUGO, NULL);
|
|
if (entry) {
|
|
entry->proc_fops = &cris_proc_profile_operations;
|
|
entry->size = SAMPLE_BUFFER_SIZE;
|
|
}
|
|
prof_running = 1;
|
|
return 0;
|
|
}
|
|
|
|
__initcall(init_cris_profile);
|