[PATCH 0/2] x86: Fix insn decoder to support 0xEA as UD

["Masami Hiramatsu (Google)" <mhiramat@kernel.org>]

Hi,

Peter found that the current x86 instruction decoder reports the 0xEA
instruction as "JMP Ap" always. But objdump says that is invalid on
64bit mode. Thus there is a difference of lenght of 0xEA between
objdump and x86 insn decoder.

I found the opcodes which have (i64) superscript are invalid in 64bit
mode, if it is not paired with (o64). Thus this stops decoding such
instructions if insn->x86_64 is set.

With this fix, the single "0xEA" is correctly decoded as 1 byte
instruction in 64bit mode.
------
printf "0:\tea\t\n" | insn_decoder_test -y -v
insn_decoder_test: success: Decoded and checked 1 instructions
------

In this series, I also found a bug in previous (!REX2) tag. The first
commit fixes that.

---

Masami Hiramatsu (Google) (2):
      x86: Fix opcode map (!REX2) superscript tags
      x86: Stop decoding i64 instructions in x86-64 mode at opcode


 arch/x86/include/asm/inat.h                |    6 +++
 arch/x86/lib/insn.c                        |    7 +++-
 arch/x86/lib/x86-opcode-map.txt            |   56 ++++++++++++++--------------
 arch/x86/tools/gen-insn-attr-x86.awk       |    7 ++++
 tools/arch/x86/include/asm/inat.h          |    6 +++
 tools/arch/x86/lib/insn.c                  |    7 +++-
 tools/arch/x86/lib/x86-opcode-map.txt      |   56 ++++++++++++++--------------
 tools/arch/x86/tools/gen-insn-attr-x86.awk |    7 ++++
 8 files changed, 94 insertions(+), 58 deletions(-)

--
Masami Hiramatsu (Google) <mhiramat@kernel.org>