[PATCH] Kprobes: Track kprobe on a per_cpu basis - base changes
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>
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@ -33,6 +33,7 @@
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#include <linux/list.h>
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#include <linux/notifier.h>
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#include <linux/smp.h>
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#include <linux/percpu.h>
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#include <asm/kprobes.h>
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@ -106,6 +107,9 @@ struct jprobe {
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kprobe_opcode_t *entry; /* probe handling code to jump to */
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};
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DECLARE_PER_CPU(struct kprobe *, current_kprobe);
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DECLARE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
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#ifdef ARCH_SUPPORTS_KRETPROBES
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extern void arch_prepare_kretprobe(struct kretprobe *rp, struct pt_regs *regs);
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#else /* ARCH_SUPPORTS_KRETPROBES */
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@ -146,13 +150,6 @@ struct kretprobe_instance {
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void lock_kprobes(void);
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void unlock_kprobes(void);
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/* kprobe running now on this CPU? */
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static inline int kprobe_running(void)
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{
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extern unsigned int kprobe_cpu;
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return kprobe_cpu == smp_processor_id();
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}
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extern int arch_prepare_kprobe(struct kprobe *p);
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extern void arch_copy_kprobe(struct kprobe *p);
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extern void arch_arm_kprobe(struct kprobe *p);
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@ -167,6 +164,22 @@ extern void free_insn_slot(kprobe_opcode_t *slot);
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struct kprobe *get_kprobe(void *addr);
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struct hlist_head * kretprobe_inst_table_head(struct task_struct *tsk);
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/* kprobe_running() will just return the current_kprobe on this CPU */
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static inline struct kprobe *kprobe_running(void)
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{
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return (__get_cpu_var(current_kprobe));
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}
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static inline void reset_current_kprobe(void)
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{
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__get_cpu_var(current_kprobe) = NULL;
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}
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static inline struct kprobe_ctlblk *get_kprobe_ctlblk(void)
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{
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return (&__get_cpu_var(kprobe_ctlblk));
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}
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int register_kprobe(struct kprobe *p);
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void unregister_kprobe(struct kprobe *p);
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int setjmp_pre_handler(struct kprobe *, struct pt_regs *);
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@ -183,9 +196,9 @@ void add_rp_inst(struct kretprobe_instance *ri);
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void kprobe_flush_task(struct task_struct *tk);
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void recycle_rp_inst(struct kretprobe_instance *ri);
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#else /* CONFIG_KPROBES */
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static inline int kprobe_running(void)
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static inline struct kprobe *kprobe_running(void)
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{
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return 0;
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return NULL;
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}
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static inline int register_kprobe(struct kprobe *p)
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{
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@ -51,7 +51,7 @@ static struct hlist_head kretprobe_inst_table[KPROBE_TABLE_SIZE];
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unsigned int kprobe_cpu = NR_CPUS;
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static DEFINE_SPINLOCK(kprobe_lock);
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static struct kprobe *curr_kprobe;
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static DEFINE_PER_CPU(struct kprobe *, kprobe_instance) = NULL;
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/*
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* kprobe->ainsn.insn points to the copy of the instruction to be
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@ -188,6 +188,17 @@ void __kprobes unlock_kprobes(void)
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local_irq_restore(flags);
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}
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/* We have preemption disabled.. so it is safe to use __ versions */
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static inline void set_kprobe_instance(struct kprobe *kp)
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{
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__get_cpu_var(kprobe_instance) = kp;
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}
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static inline void reset_kprobe_instance(void)
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{
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__get_cpu_var(kprobe_instance) = NULL;
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}
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/* You have to be holding the kprobe_lock */
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struct kprobe __kprobes *get_kprobe(void *addr)
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{
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@ -213,11 +224,11 @@ static int __kprobes aggr_pre_handler(struct kprobe *p, struct pt_regs *regs)
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list_for_each_entry(kp, &p->list, list) {
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if (kp->pre_handler) {
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curr_kprobe = kp;
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set_kprobe_instance(kp);
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if (kp->pre_handler(kp, regs))
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return 1;
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}
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curr_kprobe = NULL;
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reset_kprobe_instance();
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}
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return 0;
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}
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@ -229,9 +240,9 @@ static void __kprobes aggr_post_handler(struct kprobe *p, struct pt_regs *regs,
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list_for_each_entry(kp, &p->list, list) {
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if (kp->post_handler) {
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curr_kprobe = kp;
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set_kprobe_instance(kp);
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kp->post_handler(kp, regs, flags);
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curr_kprobe = NULL;
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reset_kprobe_instance();
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}
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}
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return;
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@ -240,12 +251,14 @@ static void __kprobes aggr_post_handler(struct kprobe *p, struct pt_regs *regs,
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static int __kprobes aggr_fault_handler(struct kprobe *p, struct pt_regs *regs,
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int trapnr)
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{
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struct kprobe *cur = __get_cpu_var(kprobe_instance);
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/*
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* if we faulted "during" the execution of a user specified
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* probe handler, invoke just that probe's fault handler
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*/
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if (curr_kprobe && curr_kprobe->fault_handler) {
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if (curr_kprobe->fault_handler(curr_kprobe, regs, trapnr))
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if (cur && cur->fault_handler) {
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if (cur->fault_handler(cur, regs, trapnr))
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return 1;
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}
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return 0;
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@ -253,15 +266,15 @@ static int __kprobes aggr_fault_handler(struct kprobe *p, struct pt_regs *regs,
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static int __kprobes aggr_break_handler(struct kprobe *p, struct pt_regs *regs)
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{
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struct kprobe *kp = curr_kprobe;
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if (curr_kprobe && kp->break_handler) {
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if (kp->break_handler(kp, regs)) {
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curr_kprobe = NULL;
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return 1;
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}
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struct kprobe *cur = __get_cpu_var(kprobe_instance);
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int ret = 0;
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if (cur && cur->break_handler) {
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if (cur->break_handler(cur, regs))
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ret = 1;
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}
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curr_kprobe = NULL;
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return 0;
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reset_kprobe_instance();
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return ret;
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}
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struct kretprobe_instance __kprobes *get_free_rp_inst(struct kretprobe *rp)
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