35 lines
1001 B
C
35 lines
1001 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
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#include <linux/rethook.h>
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#include <linux/kprobes.h>
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#include "rethook.h"
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void arch_rethook_prepare(struct rethook_node *rh, struct pt_regs *regs, bool mcount)
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{
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rh->ret_addr = regs->gprs[14];
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rh->frame = regs->gprs[15];
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/* Replace the return addr with trampoline addr */
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regs->gprs[14] = (unsigned long)&arch_rethook_trampoline;
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}
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NOKPROBE_SYMBOL(arch_rethook_prepare);
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void arch_rethook_fixup_return(struct pt_regs *regs,
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unsigned long correct_ret_addr)
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{
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/* Replace fake return address with real one. */
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regs->gprs[14] = correct_ret_addr;
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}
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NOKPROBE_SYMBOL(arch_rethook_fixup_return);
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/*
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* Called from arch_rethook_trampoline
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*/
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unsigned long arch_rethook_trampoline_callback(struct pt_regs *regs)
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{
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return rethook_trampoline_handler(regs, regs->gprs[15]);
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}
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NOKPROBE_SYMBOL(arch_rethook_trampoline_callback);
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/* assembler function that handles the rethook must not be probed itself */
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NOKPROBE_SYMBOL(arch_rethook_trampoline);
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