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| author |   Masami Hiramatsu <mhiramat@kernel.org> | 2021-03-03 00:25:34 +0900 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2021-03-23 16:07:56 +0100 |
| commit | a194acd316f93f3435a64de3b37dca2b5a77b338 (patch) | |
| tree | ff92b6594232ba0d5695aa49bb3d6487d879cda8 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | x86/kprobes: Retrieve correct opcode for group instruction (diff) | |
| download | wireguard-linux-a194acd316f93f3435a64de3b37dca2b5a77b338.tar.xz wireguard-linux-a194acd316f93f3435a64de3b37dca2b5a77b338.zip | |
x86/kprobes: Identify far indirect JMP correctly
Since Grp5 far indirect JMP is FF "mod 101 r/m", it should be
(modrm & 0x38) == 0x28, and near indirect JMP is also 0x38 == 0x20.
So we can mask modrm with 0x30 and check 0x20.
This is actually what the original code does, it also doesn't care
the last bit. So the result code is same.
Thus, I think this is just a cosmetic cleanup.
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/161469873475.49483.13257083019966335137.stgit@devnote2
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