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Message-Id: <20230327075838.5403-9-xin3.li@intel.com>
Date: Mon, 27 Mar 2023 00:58:13 -0700
From: Xin Li <xin3.li@...el.com>
To: linux-kernel@...r.kernel.org, x86@...nel.org, kvm@...r.kernel.org
Cc: tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
dave.hansen@...ux.intel.com, hpa@...or.com, peterz@...radead.org,
andrew.cooper3@...rix.com, seanjc@...gle.com, pbonzini@...hat.com,
ravi.v.shankar@...el.com, jiangshanlai@...il.com,
shan.kang@...el.com
Subject: [PATCH v6 08/33] x86/objtool: teach objtool about ERETU and ERETS
From: "H. Peter Anvin (Intel)" <hpa@...or.com>
Update the objtool decoder to know about the ERETU and ERETS
instructions (type INSN_CONTEXT_SWITCH.)
Signed-off-by: H. Peter Anvin (Intel) <hpa@...or.com>
Tested-by: Shan Kang <shan.kang@...el.com>
Signed-off-by: Xin Li <xin3.li@...el.com>
---
tools/objtool/arch/x86/decode.c | 19 ++++++++++++++-----
1 file changed, 14 insertions(+), 5 deletions(-)
diff --git a/tools/objtool/arch/x86/decode.c b/tools/objtool/arch/x86/decode.c
index 9ef024fd648c..8e9c802f78ec 100644
--- a/tools/objtool/arch/x86/decode.c
+++ b/tools/objtool/arch/x86/decode.c
@@ -509,11 +509,20 @@ int arch_decode_instruction(struct objtool_file *file, const struct section *sec
if (op2 == 0x01) {
- if (modrm == 0xca)
- insn->type = INSN_CLAC;
- else if (modrm == 0xcb)
- insn->type = INSN_STAC;
-
+ switch (insn_last_prefix_id(&ins)) {
+ case INAT_PFX_REPE:
+ case INAT_PFX_REPNE:
+ if (modrm == 0xca)
+ /* eretu/erets */
+ insn->type = INSN_CONTEXT_SWITCH;
+ break;
+ default:
+ if (modrm == 0xca)
+ insn->type = INSN_CLAC;
+ else if (modrm == 0xcb)
+ insn->type = INSN_STAC;
+ break;
+ }
} else if (op2 >= 0x80 && op2 <= 0x8f) {
insn->type = INSN_JUMP_CONDITIONAL;
--
2.34.1
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