rethook.c

 1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Generic return hook for riscv.
 4 */
 5
 6#include <linux/kprobes.h>
 7#include <linux/rethook.h>
 8#include "rethook.h"
 9
10/* This is called from arch_rethook_trampoline() */
11unsigned long __used arch_rethook_trampoline_callback(struct pt_regs *regs)
12{
13	return rethook_trampoline_handler(regs, regs->s0);
14}
15
16NOKPROBE_SYMBOL(arch_rethook_trampoline_callback);
17
18void arch_rethook_prepare(struct rethook_node *rhn, struct pt_regs *regs, bool mcount)
19{
20	rhn->ret_addr = regs->ra;
21	rhn->frame = regs->s0;
22
23	/* replace return addr with trampoline */
24	regs->ra = (unsigned long)arch_rethook_trampoline;
25}
26
27NOKPROBE_SYMBOL(arch_rethook_prepare);