kernel/probes/kprobes.c

70 	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
75 	post_kprobe_handler(kcb, regs);
133 static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb)
135 	kcb->prev_kprobe.kp = kprobe_running();
136 	kcb->prev_kprobe.status = kcb->kprobe_status;
139 static void __kprobes restore_previous_kprobe(struct kprobe_ctlblk *kcb)
141 	__this_cpu_write(current_kprobe, kcb->prev_kprobe.kp);
142 	kcb->kprobe_status = kcb->prev_kprobe.status;
158 static void __kprobes kprobes_save_local_irqflag(struct kprobe_ctlblk *kcb,
161 	kcb->saved_sr = regs->sr;
165 static void __kprobes kprobes_restore_local_irqflag(struct kprobe_ctlblk *kcb,
168 	regs->sr = kcb->saved_sr;
172 set_ss_context(struct kprobe_ctlblk *kcb, unsigned long addr, struct kprobe *p)
176 	kcb->ss_ctx.ss_pending = true;
177 	kcb->ss_ctx.match_addr = addr + offset;
180 static void __kprobes clear_ss_context(struct kprobe_ctlblk *kcb)
182 	kcb->ss_ctx.ss_pending = false;
183 	kcb->ss_ctx.match_addr = 0;
192 				       struct kprobe_ctlblk *kcb, int reenter)
197 		save_previous_kprobe(kcb);
199 		kcb->kprobe_status = KPROBE_REENTER;
201 		kcb->kprobe_status = KPROBE_HIT_SS;
208 		set_ss_context(kcb, slot, p);	/* mark pending ss */
211 		kprobes_save_local_irqflag(kcb, regs);
222 				    struct kprobe_ctlblk *kcb)
224 	switch (kcb->kprobe_status) {
228 		setup_singlestep(p, regs, kcb, 1);
245 post_kprobe_handler(struct kprobe_ctlblk *kcb, struct pt_regs *regs)
257 	if (kcb->kprobe_status == KPROBE_REENTER) {
258 		restore_previous_kprobe(kcb);
263 	kcb->kprobe_status = KPROBE_HIT_SSDONE;
277 	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
279 	switch (kcb->kprobe_status) {
292 		if (kcb->kprobe_status == KPROBE_REENTER)
293 			restore_previous_kprobe(kcb);
314 	struct kprobe_ctlblk *kcb;
317 	kcb = get_kprobe_ctlblk();
324 			if (reenter_kprobe(p, regs, kcb))
329 			kcb->kprobe_status = KPROBE_HIT_ACTIVE;
342 				setup_singlestep(p, regs, kcb, 0);
363 	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
365 	if ((kcb->ss_ctx.ss_pending)
366 	    && (kcb->ss_ctx.match_addr == instruction_pointer(regs))) {
367 		clear_ss_context(kcb);	/* clear pending ss */
369 		kprobes_restore_local_irqflag(kcb, regs);
372 		post_kprobe_handler(kcb, regs);