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authorMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>2011-10-20 23:01:09 +0900
committerIngo Molnar <mingo@elte.hu>2011-11-10 12:38:51 +0100
commit1ec454baf1245df4fdb5dae728da3363630ce6de (patch)
tree88bf565984db893b02bfdcae81b3a1d7d351d123 /arch/x86/include/asm/insn.h
parent19e0bafc36abd84a5b4d7c7745b78a6f4626e944 (diff)
downloadblackbird-op-linux-1ec454baf1245df4fdb5dae728da3363630ce6de.tar.gz
blackbird-op-linux-1ec454baf1245df4fdb5dae728da3363630ce6de.zip
x86, perf: Add a build-time sanity test to the x86 decoder
Add a sanity test of x86 insn decoder against a stream of randomly generated input, at build time. This test is also able to reproduce any bug that might trigger by allowing the passing of random-seed and iteration-number to the test, or by passing input which has invalid byte code. Changes in V2: - Code cleanup. - Show how to reproduce the error by insn_sanity test. Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: acme@redhat.com Cc: ming.m.lin@intel.com Cc: robert.richter@amd.com Cc: ravitillo@lbl.gov Cc: yrl.pp-manager.tt@hitachi.com Cc: Andi Kleen <andi@firstfloor.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20111020140109.20938.92572.stgit@localhost.localdomain Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/include/asm/insn.h')
-rw-r--r--arch/x86/include/asm/insn.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/include/asm/insn.h b/arch/x86/include/asm/insn.h
index 88c765e16410..74df3f1eddfd 100644
--- a/arch/x86/include/asm/insn.h
+++ b/arch/x86/include/asm/insn.h
@@ -137,6 +137,13 @@ static inline int insn_is_avx(struct insn *insn)
return (insn->vex_prefix.value != 0);
}
+/* Ensure this instruction is decoded completely */
+static inline int insn_complete(struct insn *insn)
+{
+ return insn->opcode.got && insn->modrm.got && insn->sib.got &&
+ insn->displacement.got && insn->immediate.got;
+}
+
static inline insn_byte_t insn_vex_m_bits(struct insn *insn)
{
if (insn->vex_prefix.nbytes == 2) /* 2 bytes VEX */
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