From a049351c5d512710f557ffb45ee6391fc86a3dc6 Mon Sep 17 00:00:00 2001
From: iximeow <me@iximeow.net>
Date: Sun, 12 Apr 2026 01:03:47 +0000
Subject: fix table management instructions' ({l,s}{g,i,l}dt) mem_size

these instructions, it turns out, have fixed operand size based on CPU
execution mode and regardless of prefixes. good to know!
---
 test/long_mode/mod.rs      | 10 +++++-----
 test/long_mode/operand.rs  |  8 ++++++++
 test/protected_mode/mod.rs | 10 +++++-----
 test/real_mode/mod.rs      | 10 +++++-----
 4 files changed, 23 insertions(+), 15 deletions(-)

(limited to 'test')

diff --git a/test/long_mode/mod.rs b/test/long_mode/mod.rs
index dc82cd4..0b6dcc6 100644
--- a/test/long_mode/mod.rs
+++ b/test/long_mode/mod.rs
@@ -955,11 +955,11 @@ fn test_0f01() {
     }
     test_display(&[0x0f, 0x01, 0x38], "invlpg byte [rax]");
     test_display(&[0x0f, 0x01, 0x3f], "invlpg byte [rdi]");
-    test_display(&[0x0f, 0x01, 0x40, 0xff], "sgdt ptr [rax - 0x1]");
-    test_display(&[0x0f, 0x01, 0x41, 0xff], "sgdt ptr [rcx - 0x1]");
-    test_display(&[0x0f, 0x01, 0x49, 0xff], "sidt ptr [rcx - 0x1]");
-    test_display(&[0x0f, 0x01, 0x51, 0xff], "lgdt ptr [rcx - 0x1]");
-    test_display(&[0x0f, 0x01, 0x59, 0xff], "lidt ptr [rcx - 0x1]");
+    test_display(&[0x0f, 0x01, 0x40, 0xff], "sgdt mword [rax - 0x1]");
+    test_display(&[0x0f, 0x01, 0x41, 0xff], "sgdt mword [rcx - 0x1]");
+    test_display(&[0x0f, 0x01, 0x49, 0xff], "sidt mword [rcx - 0x1]");
+    test_display(&[0x0f, 0x01, 0x51, 0xff], "lgdt mword [rcx - 0x1]");
+    test_display(&[0x0f, 0x01, 0x59, 0xff], "lidt mword [rcx - 0x1]");
     test_display(&[0x0f, 0x01, 0x61, 0xff], "smsw word [rcx - 0x1]");
     test_invalid(&[0x0f, 0x01, 0x69, 0xff]);
     test_display(&[0x0f, 0x01, 0x71, 0xff], "lmsw word [rcx - 0x1]");
diff --git a/test/long_mode/operand.rs b/test/long_mode/operand.rs
index 09ac5a2..9f594b5 100644
--- a/test/long_mode/operand.rs
+++ b/test/long_mode/operand.rs
@@ -69,4 +69,12 @@ fn test_implied_memory_width() {
     assert_eq!(mem_size_of(&[0x0f, 0xa8]), Some(8));
     // pop gs
     assert_eq!(mem_size_of(&[0x0f, 0xa9]), Some(8));
+    // lidt
+    assert_eq!(mem_size_of(&[0x0f, 0x01, 0x18]), Some(10));
+    // sidt
+    assert_eq!(mem_size_of(&[0x0f, 0x01, 0x08]), Some(10));
+    // lgdt
+    assert_eq!(mem_size_of(&[0x0f, 0x01, 0x10]), Some(10));
+    // sgdt
+    assert_eq!(mem_size_of(&[0x0f, 0x01, 0x00]), Some(10));
 }
diff --git a/test/protected_mode/mod.rs b/test/protected_mode/mod.rs
index 78a061a..d5533cc 100644
--- a/test/protected_mode/mod.rs
+++ b/test/protected_mode/mod.rs
@@ -811,11 +811,11 @@ fn test_0f01() {
     // Number"
     test_display(&[0x0f, 0x01, 0x38], "invlpg byte [eax]");
     test_display(&[0x0f, 0x01, 0x3f], "invlpg byte [edi]");
-    test_display(&[0x0f, 0x01, 0x40, 0xff], "sgdt ptr [eax - 0x1]");
-    test_display(&[0x0f, 0x01, 0x41, 0xff], "sgdt ptr [ecx - 0x1]");
-    test_display(&[0x0f, 0x01, 0x49, 0xff], "sidt ptr [ecx - 0x1]");
-    test_display(&[0x0f, 0x01, 0x51, 0xff], "lgdt ptr [ecx - 0x1]");
-    test_display(&[0x0f, 0x01, 0x59, 0xff], "lidt ptr [ecx - 0x1]");
+    test_display(&[0x0f, 0x01, 0x40, 0xff], "sgdt far [eax - 0x1]");
+    test_display(&[0x0f, 0x01, 0x41, 0xff], "sgdt far [ecx - 0x1]");
+    test_display(&[0x0f, 0x01, 0x49, 0xff], "sidt far [ecx - 0x1]");
+    test_display(&[0x0f, 0x01, 0x51, 0xff], "lgdt far [ecx - 0x1]");
+    test_display(&[0x0f, 0x01, 0x59, 0xff], "lidt far [ecx - 0x1]");
     test_display(&[0x0f, 0x01, 0x61, 0xff], "smsw word [ecx - 0x1]");
     test_invalid(&[0x0f, 0x01, 0x69, 0xff]);
     test_display(&[0x0f, 0x01, 0x71, 0xff], "lmsw word [ecx - 0x1]");
diff --git a/test/real_mode/mod.rs b/test/real_mode/mod.rs
index 5fb109f..af8bfaf 100644
--- a/test/real_mode/mod.rs
+++ b/test/real_mode/mod.rs
@@ -104,11 +104,11 @@ fn test_real_mode() {
     test_display(&[0x0e], "push cs");
     test_display(&[0x0f, 0x01, 0x38], "invlpg byte [bx + si * 1]");
     test_display(&[0x0f, 0x01, 0x3f], "invlpg byte [bx]");
-    test_display(&[0x0f, 0x01, 0x40, 0xff], "sgdt ptr [bx + si * 1 - 0x1]");
-    test_display(&[0x0f, 0x01, 0x41, 0xff], "sgdt ptr [bx + di * 1 - 0x1]");
-    test_display(&[0x0f, 0x01, 0x49, 0xff], "sidt ptr [bx + di * 1 - 0x1]");
-    test_display(&[0x0f, 0x01, 0x51, 0xff], "lgdt ptr [bx + di * 1 - 0x1]");
-    test_display(&[0x0f, 0x01, 0x59, 0xff], "lidt ptr [bx + di * 1 - 0x1]");
+    test_display(&[0x0f, 0x01, 0x40, 0xff], "sgdt far [bx + si * 1 - 0x1]");
+    test_display(&[0x0f, 0x01, 0x41, 0xff], "sgdt far [bx + di * 1 - 0x1]");
+    test_display(&[0x0f, 0x01, 0x49, 0xff], "sidt far [bx + di * 1 - 0x1]");
+    test_display(&[0x0f, 0x01, 0x51, 0xff], "lgdt far [bx + di * 1 - 0x1]");
+    test_display(&[0x0f, 0x01, 0x59, 0xff], "lidt far [bx + di * 1 - 0x1]");
     test_display(&[0x0f, 0x01, 0x61, 0xff], "smsw word [bx + di * 1 - 0x1]");
     test_display(&[0x0f, 0x01, 0x71, 0xff], "lmsw word [bx + di * 1 - 0x1]");
     test_display(&[0x0f, 0x01, 0x79, 0xff], "invlpg byte [bx + di * 1 - 0x1]");
-- 
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