1 // SPDX-License-Identifier: GPL-2.0-or-later
2 #include <linux/rethook.h>
3 #include <linux/kprobes.h>
4 #include "rethook.h"
5
6 void arch_rethook_prepare(struct rethook_node *rh, struct pt_regs *regs, bool mcount)
7 {
8 rh->ret_addr = regs->gprs[14];
9 rh->frame = regs->gprs[15];
10
11 /* Replace the return addr with trampoline addr */
12 regs->gprs[14] = (unsigned long)&arch_rethook_trampoline;
13 }
14 NOKPROBE_SYMBOL(arch_rethook_prepare);
15
16 void arch_rethook_fixup_return(struct pt_regs *regs,
17 unsigned long correct_ret_addr)
18 {
19 /* Replace fake return address with real one. */
20 regs->gprs[14] = correct_ret_addr;
21 }
22 NOKPROBE_SYMBOL(arch_rethook_fixup_return);
23
24 /*
25 * Called from arch_rethook_trampoline
26 */
27 unsigned long arch_rethook_trampoline_callback(struct pt_regs *regs)
28 {
29 return rethook_trampoline_handler(regs, regs->gprs[15]);
30 }
31 NOKPROBE_SYMBOL(arch_rethook_trampoline_callback);
32
33 /* assembler function that handles the rethook must not be probed itself */
34 NOKPROBE_SYMBOL(arch_rethook_trampoline);
35
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