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