Commit | Line | Data |
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1a280f48 VG |
1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | #include <linux/rethook.h> | |
3 | #include <linux/kprobes.h> | |
1e2eb49b | 4 | #include "rethook.h" |
1a280f48 VG |
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); |