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() */ arch_rethook_trampoline_callback(struct pt_regs * regs)11unsigned long __used arch_rethook_trampoline_callback(struct pt_regs *regs) 12 { 13 return rethook_trampoline_handler(regs, 0); 14 } 15 NOKPROBE_SYMBOL(arch_rethook_trampoline_callback); 16 arch_rethook_prepare(struct rethook_node * rhn,struct pt_regs * regs,bool mcount)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 } 25 NOKPROBE_SYMBOL(arch_rethook_prepare); 26 27 /* ASM function that handles the rethook must not be probed itself */ 28 NOKPROBE_SYMBOL(arch_rethook_trampoline); 29