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([172.25.112.68]) by fmsmga008.fm.intel.com with ESMTP; 06 Jan 2023 01:20:12 -0800 From: Xin Li To: linux-kernel@vger.kernel.org, x86@kernel.org, kvm@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, peterz@infradead.org, andrew.cooper3@citrix.com, seanjc@google.com, pbonzini@redhat.com, ravi.v.shankar@intel.com Subject: [RFC PATCH v2 08/32] x86/objtool: teach objtool about ERETU and ERETS Date: Fri, 6 Jan 2023 00:55:53 -0800 Message-Id: <20230106085617.17248-9-xin3.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230106085617.17248-1-xin3.li@intel.com> References: <20230106085617.17248-1-xin3.li@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED, SPF_HELO_NONE,SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "H. Peter Anvin (Intel)" Update the objtool decoder to know about the ERETU and ERETS instructions (type INSN_CONTEXT_SWITCH.) Signed-off-by: H. Peter Anvin (Intel) Signed-off-by: Xin Li --- tools/objtool/arch/x86/decode.c | 22 ++++++++++++++++------ 1 file changed, 16 insertions(+), 6 deletions(-) diff --git a/tools/objtool/arch/x86/decode.c b/tools/objtool/arch/x86/decode.c index 1c253b4b7ce0..fbfe0a39599a 100644 --- a/tools/objtool/arch/x86/decode.c +++ b/tools/objtool/arch/x86/decode.c @@ -480,12 +480,22 @@ int arch_decode_instruction(struct objtool_file *file, const struct section *sec case 0x0f: if (op2 == 0x01) { - - if (modrm == 0xca) - *type = INSN_CLAC; - else if (modrm == 0xcb) - *type = INSN_STAC; - + switch (insn_last_prefix_id(&insn)) { + case INAT_PFX_REPE: + case INAT_PFX_REPNE: + if (modrm == 0xca) { + /* eretu/erets */ + *type = INSN_CONTEXT_SWITCH; + } + break; + default: + if (modrm == 0xca) { + *type = INSN_CLAC; + } else if (modrm == 0xcb) { + *type = INSN_STAC; + } + break; + } } else if (op2 >= 0x80 && op2 <= 0x8f) { *type = INSN_JUMP_CONDITIONAL; -- 2.34.1