diff options
Diffstat (limited to 'arch/loongarch/kernel/rethook.c')
-rw-r--r-- | arch/loongarch/kernel/rethook.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/loongarch/kernel/rethook.c b/arch/loongarch/kernel/rethook.c new file mode 100644 index 0000000000..db1c5f5024 --- /dev/null +++ b/arch/loongarch/kernel/rethook.c @@ -0,0 +1,28 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Generic return hook for LoongArch. + */ + +#include <linux/kprobes.h> +#include <linux/rethook.h> +#include "rethook.h" + +/* This is called from arch_rethook_trampoline() */ +unsigned long __used arch_rethook_trampoline_callback(struct pt_regs *regs) +{ + return rethook_trampoline_handler(regs, 0); +} +NOKPROBE_SYMBOL(arch_rethook_trampoline_callback); + +void arch_rethook_prepare(struct rethook_node *rhn, struct pt_regs *regs, bool mcount) +{ + rhn->frame = 0; + rhn->ret_addr = regs->regs[1]; + + /* replace return addr with trampoline */ + regs->regs[1] = (unsigned long)arch_rethook_trampoline; +} +NOKPROBE_SYMBOL(arch_rethook_prepare); + +/* ASM function that handles the rethook must not be probed itself */ +NOKPROBE_SYMBOL(arch_rethook_trampoline); |