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x86/objtool: Teach objtool about ERET[US]

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Update the objtool decoder to know about the ERET[US] instructions
(type INSN_CONTEXT_SWITCH).

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Xin Li <xin3.li@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Shan Kang <shan.kang@intel.com>
Link: https://lore.kernel.org/r/20231205105030.8698-11-xin3.li@intel.com
This commit is contained in:
H. Peter Anvin (Intel) 2023-12-05 02:49:59 -08:00 committed by Borislav Petkov (AMD)
parent 0115f8b1a2
commit cd19bab825
1 changed files with 14 additions and 5 deletions
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19
tools/objtool/arch/x86/decode.c
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@ -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;