linux-kernel - [tip:perf/urgent] perf tools intel-pt-decoder: Update insn.h from the kernel sources

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Date:   Sun, 3 Jun 2018 10:17:28 -0700
From:   tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mhiramat@...nel.org, acme@...hat.com, mingo@...nel.org,
        hpa@...or.com, adrian.hunter@...el.com, jolsa@...nel.org,
        tglx@...utronix.de, linux-kernel@...r.kernel.org,
        dsahern@...il.com, namhyung@...nel.org, wangnan0@...wei.com
Subject: [tip:perf/urgent] perf tools intel-pt-decoder: Update insn.h from
 the kernel sources

Commit-ID:  0b3a18387f3e5cdcfaaf884860a4688280d09c9d
Gitweb:     https://git.kernel.org/tip/0b3a18387f3e5cdcfaaf884860a4688280d09c9d
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Fri, 1 Jun 2018 13:15:19 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 1 Jun 2018 16:13:18 -0300

perf tools intel-pt-decoder: Update insn.h from the kernel sources

To pick up the changes in:

  ee6a7354a362 ("kprobes/x86: Prohibit probing on exception masking instructions")

That doesn't entail changes in tooling, but silences this perf build
warning:

  Warning: Intel PT: x86 instruction decoder header at 'tools/perf/util/intel-pt-decoder/insn.h' differs from latest version at 'arch/x86/include/asm/insn.h'

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Wang Nan <wangnan0@...wei.com>
Link: https://lkml.kernel.org/n/tip-o3wfwjnyh7r8l0gi9q3y9f44@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/intel-pt-decoder/insn.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/tools/perf/util/intel-pt-decoder/insn.h b/tools/perf/util/intel-pt-decoder/insn.h
index e23578c7b1be..2669c9f748e4 100644
--- a/tools/perf/util/intel-pt-decoder/insn.h
+++ b/tools/perf/util/intel-pt-decoder/insn.h
@@ -208,4 +208,22 @@ static inline int insn_offset_immediate(struct insn *insn)
 	return insn_offset_displacement(insn) + insn->displacement.nbytes;
 }
 
+#define POP_SS_OPCODE 0x1f
+#define MOV_SREG_OPCODE 0x8e
+
+/*
+ * Intel SDM Vol.3A 6.8.3 states;
+ * "Any single-step trap that would be delivered following the MOV to SS
+ * instruction or POP to SS instruction (because EFLAGS.TF is 1) is
+ * suppressed."
+ * This function returns true if @insn is MOV SS or POP SS. On these
+ * instructions, single stepping is suppressed.
+ */
+static inline int insn_masking_exception(struct insn *insn)
+{
+	return insn->opcode.bytes[0] == POP_SS_OPCODE ||
+		(insn->opcode.bytes[0] == MOV_SREG_OPCODE &&
+		 X86_MODRM_REG(insn->modrm.bytes[0]) == 2);
+}
+
 #endif /* _ASM_X86_INSN_H */