1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
|
// SPDX-License-Identifier: GPL-2.0
/*
* Generic return hook for LoongArch.
*/
#include <linux/kprobes.h>
#include <linux/rethook.h>
#include "rethook.h"
/* This is called from arch_rethook_trampoline() */
unsigned long __used arch_rethook_trampoline_callback(struct pt_regs *regs)
{
return rethook_trampoline_handler(regs, 0);
}
NOKPROBE_SYMBOL(arch_rethook_trampoline_callback);
void arch_rethook_prepare(struct rethook_node *rhn, struct pt_regs *regs, bool mcount)
{
rhn->frame = 0;
rhn->ret_addr = regs->regs[1];
/* replace return addr with trampoline */
regs->regs[1] = (unsigned long)arch_rethook_trampoline;
}
NOKPROBE_SYMBOL(arch_rethook_prepare);
/* ASM function that handles the rethook must not be probed itself */
NOKPROBE_SYMBOL(arch_rethook_trampoline);
|
