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78173ec631
The MPX instructions are presently not described in the SDM opcode maps, and there are not encoding characters for bnd registers, address method or operand type. So the kernel opcode map is using 'Gv' for bnd registers and 'Ev' for everything else. That is fine because the instruction decoder does not use that information anyway, except as an indication that there is a ModR/M byte. Nevertheless, in some cases the 'Gv' and 'Ev' are the wrong way around, BNDLDX and BNDSTX have 2 operands not 3, and it wouldn't hurt to identify the mandatory prefixes. This has no effect on the decoding of valid instructions, but the addition of the mandatory prefixes will cause some invalid instructions to error out that wouldn't have previously. Note that perf tools has a copy of the instruction decoder and provides a test for new instructions which includes MPX instructions e.g. $ perf test "x86 ins" 39: Test x86 instruction decoder - new instructions : Ok Or to see the details: $ perf test -v "x86 ins" Commiter notes: And to see these MPX instructions specifically: $ perf test -v "x86 ins" 2>&1 | grep bndldx | head -3 Decoded ok: 0f 1a 00 bndldx (%eax),%bnd0 Decoded ok: 0f 1a 05 78 56 34 12 bndldx 0x12345678,%bnd0 Decoded ok: 0f 1a 18 bndldx (%eax),%bnd3 $ perf test -v "x86 ins" 2>&1 | grep bndstx | head -3 Decoded ok: 0f 1b 00 bndstx %bnd0,(%eax) Decoded ok: 0f 1b 05 78 56 34 12 bndstx %bnd0,0x12345678 Decoded ok: 0f 1b 18 bndstx %bnd3,(%eax) $ Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Qiaowei Ren <qiaowei.ren@intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1441196131-20632-4-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> |
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