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- // SPDX-License-Identifier: GPL-2.0
- #include <linux/kprobes.h>
- /* Ftrace callback handler for kprobes -- called under preepmt disabed */
- void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
- struct ftrace_ops *ops, struct pt_regs *regs)
- {
- struct kprobe *p;
- struct kprobe_ctlblk *kcb;
- p = get_kprobe((kprobe_opcode_t *)ip);
- if (unlikely(!p) || kprobe_disabled(p))
- return;
- kcb = get_kprobe_ctlblk();
- if (kprobe_running()) {
- kprobes_inc_nmissed_count(p);
- } else {
- unsigned long orig_ip = instruction_pointer(regs);
- instruction_pointer_set(regs, ip);
- __this_cpu_write(current_kprobe, p);
- kcb->kprobe_status = KPROBE_HIT_ACTIVE;
- if (!p->pre_handler || !p->pre_handler(p, regs)) {
- /*
- * Emulate singlestep (and also recover regs->pc)
- * as if there is a nop
- */
- instruction_pointer_set(regs,
- (unsigned long)p->addr + MCOUNT_INSN_SIZE);
- if (unlikely(p->post_handler)) {
- kcb->kprobe_status = KPROBE_HIT_SSDONE;
- p->post_handler(p, regs, 0);
- }
- instruction_pointer_set(regs, orig_ip);
- }
- /*
- * If pre_handler returns !0, it changes regs->pc. We have to
- * skip emulating post_handler.
- */
- __this_cpu_write(current_kprobe, NULL);
- }
- }
- NOKPROBE_SYMBOL(kprobe_ftrace_handler);
- int arch_prepare_kprobe_ftrace(struct kprobe *p)
- {
- p->ainsn.api.insn = NULL;
- return 0;
- }
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