Hi,
>From: Sandeepa Prabhu <sandeepa.s.pra...@gmail.com>
>
>The pre-handler of this special 'trampoline' kprobe executes the return
>probe handler functions and restores original return address in ELR_EL1.
>This way the saved pt_regs still hold the original register context to be
>carried back to the probed kernel function.
This patch seems not well separated.
>diff --git a/arch/arm64/kernel/kprobes.c b/arch/arm64/kernel/kprobes.c
>index bd3f233..13d3333 100644
>--- a/arch/arm64/kernel/kprobes.c
>+++ b/arch/arm64/kernel/kprobes.c
[snip]
>+void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
>+ struct pt_regs *regs)
>+{
>+ ri->ret_addr = (kprobe_opcode_t *)regs->regs[30];
>+
>+ /* replace return addr (x30) with trampoline */
>+ regs->regs[30] = (long)&kretprobe_trampoline;
So, where is the kretprobe_trampoline? It seems that function is
defined in other patch.
>+}
>+
>+int __kprobes arch_trampoline_kprobe(struct kprobe *p)
>+{
>+ return 0;
> }
And what this function is for??
Thank you,
>
> int __init arch_init_kprobes(void)
>--
>2.5.0
>
>
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