1// SPDX-License-Identifier: GPL-2.0 2/* 3 * Generic return hook for LoongArch. 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, 0); 14} 15NOKPROBE_SYMBOL(arch_rethook_trampoline_callback); 16 17void arch_rethook_prepare(struct rethook_node *rhn, struct pt_regs *regs, bool mcount) 18{ 19 rhn->frame = 0; 20 rhn->ret_addr = regs->regs[1]; 21 22 /* replace return addr with trampoline */ 23 regs->regs[1] = (unsigned long)arch_rethook_trampoline; 24} 25NOKPROBE_SYMBOL(arch_rethook_prepare); 26 27/* ASM function that handles the rethook must not be probed itself */ 28NOKPROBE_SYMBOL(arch_rethook_trampoline); 29