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//#ifdef CONFIG_USERSTACKTRACEG
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/seq_file.h>
#include <linux/proc_fs.h>
#include <linux/mm.h>
#include <linux/nmi.h>
#include <linux/quicklist.h>
#include <asm/setup.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/cacheflush.h>
#include <asm/ptrace.h>
#include <asm/uaccess.h>
#include <asm/cacheflush.h>
#include <linux/kallsyms.h>
#include <linux/ext2_fs.h>
#include <linux/highmem.h>
#define K(x) ((x) << (PAGE_SHIFT - 10))
extern struct meminfo meminfo;
static int show_user_stack(struct seq_file *m, void *v);
//static struct proc_dir_entry* userstack_info;
static int get_pfn_from_mm(unsigned long address, struct mm_struct *mm)
{
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
int ret = 0;
pgd = pgd_offset(mm, address);
if (!pgd_present(*pgd))
return ret;
pud = pud_offset(pgd, address);
if (!pud_present(*pud))
return ret;
pmd = pmd_offset(pud, address);
if (!pmd_present(*pmd))
return ret;
pte = pte_offset_map(pmd, address);
if (!pte_present(*pte))
return 0;
return pte_pfn(*pte);
}
static struct page *user_addr_to_page(unsigned long uaddr, struct task_struct *task)
{
int pfn;
pfn = get_pfn_from_mm(uaddr, task->mm);
if (!pfn)
return NULL;
return pfn_to_page(pfn);
}
static int show_userstack_of_task(struct task_struct *task, struct seq_file *m, void *v)
{
unsigned long val;
unsigned long p;
struct vm_area_struct *vma;
unsigned long usersp, kusersp;
unsigned long length = 32*10;
unsigned long *kaddr = NULL;
struct page *page = NULL;
pgoff_t pgoff;
if (!task->mm) {
seq_printf(m, "pid:%d, it's a kthread, no userstack!\n",task->pid);
return 0;
}
usersp = task_pt_regs(task)->uregs[13];
seq_printf(m, "userstack pid:%d sp:0x%p\n\n", task->pid, (void *)usersp);
page = user_addr_to_page(usersp, task);
if (!page) {
seq_printf(m, "Sorry, can't find the stack's page!\n");
return 0;
}
pgoff = usersp & 0x00000fff;
kaddr = kmap(page);
kusersp = (unsigned long)kaddr + pgoff;
for (p = kusersp; p < kusersp + length; p += 4) {
vma = NULL;
val = *(unsigned long *)p;
vma = find_vma(task->mm, val);
if (vma) {
struct file *file = vma->vm_file;
struct mm_struct *mm = vma->vm_mm;
if (val < vma->vm_start) {
seq_printf(m, "%4lx: %08lx \n", p, val);
continue;
}
if (file) {
char buf[50];
char *pp = NULL;
memset(buf, 0, 50);
pp = d_path(&file->f_path, buf, 50);
if (!IS_ERR(pp))
mangle_path(buf, pp, "\n");
seq_printf(m, "%4lx: %08lx %s 0x%p\n", p, val, buf, (void *)vma->vm_start);
} else {
const char *name = arch_vma_name(vma);
if (!name) {
if (vma->vm_start <= mm->start_brk && vma->vm_end >= mm->brk)
seq_printf(m, "%4lx: %08lx [heap]\n", p, val);
else if (vma->vm_start <= mm->start_stack && vma->vm_end >= mm->start_stack)
seq_printf(m, "%4lx: %08lx [stack]\n", p, val);
else
seq_printf(m, "%4lx: %08lx [vdso]\n", p, val);
} else
seq_printf(m, "%4lx: %08lx %s\n", p, val, name);
}
} else
seq_printf(m, "%4lx: %08lx \n", p, val);
}
seq_printf(m, "====================================================\n");
kunmap(page);
return 0;
}
static int show_user_stack(struct seq_file *m, void *v)
{
struct task_struct *g, *p;
seq_printf(m, "=============enter ====show_user_stack===========\n");
do_each_thread(g, p) {
task_lock(p);
if (p->state == TASK_UNINTERRUPTIBLE)
show_userstack_of_task(p, m, v);
task_unlock(p);
}while_each_thread(g, p);
return 0;
}
static int userstack_proc_open(struct inode* inode, struct file* file)
{
single_open(file, show_user_stack, NULL);
return 0;
}
struct file_operations userstack_info_proc_fops =
{
.open = userstack_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
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