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[PATCH] Kprobes: Track kprobe on a per_cpu basis - base changes

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Changes to the base kprobe infrastructure to track kprobe execution on a
per-cpu basis.

Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ananth N Mavinakayanahalli
2005-11-07 01:00:07 -08:00
committed by Linus Torvalds
parent 66ff2d0691
commit e65845235c
2 changed files with 50 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

43
kernel/kprobes.c
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@@ -51,7 +51,7 @@ static struct hlist_head kretprobe_inst_table[KPROBE_TABLE_SIZE];
unsigned int kprobe_cpu = NR_CPUS;
static DEFINE_SPINLOCK(kprobe_lock);
static struct kprobe *curr_kprobe;
static DEFINE_PER_CPU(struct kprobe *, kprobe_instance) = NULL;
/*
* kprobe->ainsn.insn points to the copy of the instruction to be
@@ -188,6 +188,17 @@ void __kprobes unlock_kprobes(void)
local_irq_restore(flags);
}
/* We have preemption disabled.. so it is safe to use __ versions */
static inline void set_kprobe_instance(struct kprobe *kp)
{
__get_cpu_var(kprobe_instance) = kp;
}
static inline void reset_kprobe_instance(void)
{
__get_cpu_var(kprobe_instance) = NULL;
}
/* You have to be holding the kprobe_lock */
struct kprobe __kprobes *get_kprobe(void *addr)
{
@@ -213,11 +224,11 @@ static int __kprobes aggr_pre_handler(struct kprobe *p, struct pt_regs *regs)
list_for_each_entry(kp, &p->list, list) {
if (kp->pre_handler) {
curr_kprobe = kp;
set_kprobe_instance(kp);
if (kp->pre_handler(kp, regs))
return 1;
}
curr_kprobe = NULL;
reset_kprobe_instance();
}
return 0;
}
@@ -229,9 +240,9 @@ static void __kprobes aggr_post_handler(struct kprobe *p, struct pt_regs *regs,
list_for_each_entry(kp, &p->list, list) {
if (kp->post_handler) {
curr_kprobe = kp;
set_kprobe_instance(kp);
kp->post_handler(kp, regs, flags);
curr_kprobe = NULL;
reset_kprobe_instance();
}
}
return;
@@ -240,12 +251,14 @@ static void __kprobes aggr_post_handler(struct kprobe *p, struct pt_regs *regs,
static int __kprobes aggr_fault_handler(struct kprobe *p, struct pt_regs *regs,
int trapnr)
{
struct kprobe *cur = __get_cpu_var(kprobe_instance);
/*
* if we faulted "during" the execution of a user specified
* probe handler, invoke just that probe's fault handler
*/
if (curr_kprobe && curr_kprobe->fault_handler) {
if (curr_kprobe->fault_handler(curr_kprobe, regs, trapnr))
if (cur && cur->fault_handler) {
if (cur->fault_handler(cur, regs, trapnr))
return 1;
}
return 0;
@@ -253,15 +266,15 @@ static int __kprobes aggr_fault_handler(struct kprobe *p, struct pt_regs *regs,
static int __kprobes aggr_break_handler(struct kprobe *p, struct pt_regs *regs)
{
struct kprobe *kp = curr_kprobe;
if (curr_kprobe && kp->break_handler) {
if (kp->break_handler(kp, regs)) {
curr_kprobe = NULL;
return 1;
}
struct kprobe *cur = __get_cpu_var(kprobe_instance);
int ret = 0;
if (cur && cur->break_handler) {
if (cur->break_handler(cur, regs))
ret = 1;
}
curr_kprobe = NULL;
return 0;
reset_kprobe_instance();
return ret;
}
struct kretprobe_instance __kprobes *get_free_rp_inst(struct kretprobe *rp)