| 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, frame: 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 |