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SubjectRe: arch/x86/tools/insn_decoder_test: warning: ffffffff810005ac: 0f ff e9 ud0 %ecx,%ebp
On Thu, 8 Feb 2018 06:04:45 +0800
kbuild test robot <fengguang.wu@intel.com> wrote:

> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head: 7590e37bdaeec25ae325f4ba450be13e2aac6c8d
> commit: 10c91577d5e631773a6394e14cf60125389b71ae x86/tools: Standardize output format of insn_decode_test
> date: 8 weeks ago
> config: x86_64-randconfig-s2-02072130 (attached as .config)
> compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
> reproduce:
> git checkout 10c91577d5e631773a6394e14cf60125389b71ae
> # save the attached .config to linux build tree
> make ARCH=x86_64
>
> All warnings (new ones prefixed by >>):
>
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> >> arch/x86/tools/insn_decoder_test: warning: ffffffff810005ac: 0f ff e9 ud0 %ecx,%ebp

Does UD0 really take an operand? Hmm, indeed, the latest Intel SDM (December2017) says

NOTES:
1. Some older processors decode the UD0 instruction without a ModR/M byte. As a result, those processors would deliver an invalid-
opcode exception instead of a fault on instruction fetch when the instruction with a ModR/M byte (and any implied bytes) would
cross a page or segment boundary.

and older SDM (e.g. March 2017) says UD0 has no modrm byte.
It is easy to change x86-opecode-map.txt, but this means this test may fail with older objdump...

> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff8100207e: 0f ff eb ud0 %ebx,%ebp
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff81002218: 0f ff e9 ud0 %ecx,%ebp
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff81002317: 0f ff e9 ud0 %ecx,%ebp
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff810029f4: 0f ff e9 ud0 %ecx,%ebp
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff81002af4: 0f ff eb ud0 %ebx,%ebp
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff81002c27: 0f ff eb ud0 %ebx,%ebp
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff81002da5: 0f ff eb ud0 %ebx,%ebp
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff81002dd5: 0f ff eb ud0 %ebx,%ebp
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff81002eda: 0f ff 65 8b ud0 -0x75(%rbp),%esp
> arch/x86/tools/insn_decoder_test: warning: objdump says 4 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff81002f58: 0f ff eb ud0 %ebx,%ebp
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff810030c6: 0f ff eb ud0 %ebx,%ebp
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff81003158: 0f ff 5b 5d ud0 0x5d(%rbx),%ebx
> arch/x86/tools/insn_decoder_test: warning: objdump says 4 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff8100404c: 0f ff 5b 5d ud0 0x5d(%rbx),%ebx
> arch/x86/tools/insn_decoder_test: warning: objdump says 4 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff81004053: 0f ff eb ud0 %ebx,%ebp
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff81004056: f7 0f ff eb ab 0f testl $0xfabebff,(%rdi)
> arch/x86/tools/insn_decoder_test: warning: objdump says 6 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff81005004: 0f ff eb ud0 %ebx,%ebp
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff81005039: 0f ff eb ud0 %ebx,%ebp
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff810052a4: 0f ff eb ud0 %ebx,%ebp
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff81005889: 0f ff eb ud0 %ebx,%ebp
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff8100588d: 0f ff eb ud0 %ebx,%ebp
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff810059a1: 0f ff eb ud0 %ebx,%ebp
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff81005a3a: 0f ff eb ud0 %ebx,%ebp
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff8100609f: 0f ff c3 ud0 %ebx,%eax
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff8100617c: 0f ff eb ud0 %ebx,%ebp
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff8100620a: 0f ff eb ud0 %ebx,%ebp
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff8100652b: 0f ff c3 ud0 %ebx,%eax
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff8100655a: 0f ff e9 ud0 %ecx,%ebp
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff810069ce: 0f ff eb ud0 %ebx,%ebp
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff81007332: 0f ff c3 ud0 %ebx,%eax
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff81007382: 0f ff c3 ud0 %ebx,%eax
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff81007c1f: 0f ff 41 8b ud0 -0x75(%rcx),%eax
> arch/x86/tools/insn_decoder_test: warning: objdump says 4 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff81007c2f: 0f ff eb ud0 %ebx,%ebp
> arch/x86/tools/insn_decoder_test: warning: objdump says 3 bytes, but insn_get_length() says 2
> arch/x86/tools/insn_decoder_test: warning: Found an x86 instruction decoder bug, please report this.
> arch/x86/tools/insn_decoder_test: warning: ffffffff81008a3c: 0f ff 5b 5d ud0 0x5d(%rbx),%ebx
> arch/x86/tools/insn_decoder_test: warning: objdump says 4 bytes, but insn_get_length() says 2
>
> ---
> 0-DAY kernel test infrastructure Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all Intel Corporation


--
Masami Hiramatsu <mhiramat@kernel.org>

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