Messages in this thread | | | Date | Fri, 23 Aug 2019 23:51:27 +0900 | From | Masami Hiramatsu <> | Subject | Re: [PATCH v2 1/3] kprobes/x86: use instruction_pointer and instruction_pointer_set |
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Hi Jisheng,
On Wed, 21 Aug 2019 02:09:10 +0000 Jisheng Zhang <Jisheng.Zhang@synaptics.com> wrote:
> > > In v2, actually, the arm64 version's kprobe_ftrace_handler() is the same > > > as x86's, the only difference is comment, e.g > > > > > > /* Kprobe handler expects regs->ip = ip + 1 as breakpoint hit */ > > > > > > while in arm64 > > > > > > /* Kprobe handler expects regs->pc = ip + 1 as breakpoint hit */ > > > > As Peter pointed, on arm64, is that really 1 or 4 bytes? > > This part is heavily depends on the processor software-breakpoint > > implementation. > > Per my understanding, the "+1" here means "+ one kprobe_opcode_t".
No, that is the size of INT3. It just emulates the software trap on x86.
Thank you, -- Masami Hiramatsu <mhiramat@kernel.org>
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