/usr/share/systemtap/runtime/kprobes-common.c is in systemtap-common 1.7-1+deb7u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 | /* -*- linux-c -*-
* kprobe Functions
* Copyright (C) 2010 Red Hat Inc.
*
* This file is part of systemtap, and is free software. You can
* redistribute it and/or modify it under the terms of the GNU General
* Public License (GPL); either version 2, or (at your option) any
* later version.
*/
#ifndef _KPROBE_COMMON_C_
#define _KPROBE_COMMON_C_
#ifdef KPROBES_TASK_FINDER
/* The task_finder_callback */
static int stap_kprobe_process_found (struct stap_task_finder_target *finder, struct task_struct *tsk, int register_p, int process_p) {
struct stap_dwarf_probe *p = container_of(finder, struct stap_dwarf_probe, finder);
unsigned short sdt_semaphore = 0;
if (! process_p) return 0; /* ignore threads */
#ifdef DEBUG_TASK_FINDER_VMA
_stp_dbug (__FUNCTION__,__LINE__, "%cproc pid %d stf %p %p path %s\n", register_p?'+':'-', tsk->tgid, finder, p, p->pathname);
#endif
p->tsk = tsk;
p->sdt_sem_address = p->sdt_sem_offset;
if (get_user (sdt_semaphore, (unsigned short __user *) p->sdt_sem_address) == 0) {
sdt_semaphore ++;
#ifdef DEBUG_UPROBES
_stp_dbug (__FUNCTION__,__LINE__, "+semaphore %#x @ %#lx\n", sdt_semaphore, p->sdt_sem_address);
#endif
put_user (sdt_semaphore, (unsigned short __user *) p->sdt_sem_address);
}
return 0;
}
/* The task_finder_mmap_callback */
static int stap_kprobe_mmap_found (struct stap_task_finder_target *finder, struct task_struct *tsk, char *path, struct dentry *dentry, unsigned long addr, unsigned long length, unsigned long offset, unsigned long vm_flags) {
struct stap_dwarf_probe *p = container_of(finder, struct stap_dwarf_probe, finder);
int rc = 0;
if (path == NULL || strcmp (path, p->pathname)) return 0;
if (p->sdt_sem_offset && p->sdt_sem_address == 0) {
p->tsk = tsk;
if (vm_flags & VM_EXECUTABLE) {
p->sdt_sem_address = addr + p->sdt_sem_offset;
}
else {
p->sdt_sem_address = (addr - offset) + p->sdt_sem_offset;
}
}
if (p->sdt_sem_address && (vm_flags & VM_WRITE)) {
unsigned short sdt_semaphore = 0;
if (get_user (sdt_semaphore, (unsigned short __user *) p->sdt_sem_address) == 0) {
sdt_semaphore ++;
#ifdef DEBUG_UPROBES
_stp_dbug (__FUNCTION__,__LINE__, "+semaphore %#x @ %#lx\n", sdt_semaphore, p->sdt_sem_address);
#endif
put_user (sdt_semaphore, (unsigned short __user *) p->sdt_sem_address);
}
}
return 0;
}
#endif /* KPROBES_TASK_FINDER */
#endif /* _KPROBE_COMMON_C_ */
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