// SPDX-License-Identifier: GPL-2.0-or-later#include <linux/rethook.h>#include <linux/kprobes.h>#include "rethook.h" void arch_rethook_prepare(struct rethook_node *rh, struct pt_regs *regs, bool mcount){	rh->ret_addr = regs->gprs[14];	rh->frame = regs->gprs[15]; 	/* Replace the return addr with trampoline addr */	regs->gprs[14] = (unsigned long)&arch_rethook_trampoline;}NOKPROBE_SYMBOL(arch_rethook_prepare); void arch_rethook_fixup_return(struct pt_regs *regs,			       unsigned long correct_ret_addr){	/* Replace fake return address with real one. */	regs->gprs[14] = correct_ret_addr;}NOKPROBE_SYMBOL(arch_rethook_fixup_return); /* * Called from arch_rethook_trampoline */unsigned long arch_rethook_trampoline_callback(struct pt_regs *regs){	return rethook_trampoline_handler(regs, regs->gprs[15]);}NOKPROBE_SYMBOL(arch_rethook_trampoline_callback); /* assembler function that handles the rethook must not be probed itself */NOKPROBE_SYMBOL(arch_rethook_trampoline);