From f2a2a09688421f2c532ab6f02527bf68f095407a Mon Sep 17 00:00:00 2001
From: iximeow <me@iximeow.net>
Date: Mon, 25 May 2026 17:32:57 +0000
Subject: j*cxz/pusha/popa alternate size forms

these all existed since forever but the library did not distinguish them
and did not provide prefix information for users to tell which had been
decoded.
---
 src/long_mode/display.rs | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

(limited to 'src/long_mode/display.rs')

diff --git a/src/long_mode/display.rs b/src/long_mode/display.rs
index f215d07..a00dd22 100644
--- a/src/long_mode/display.rs
+++ b/src/long_mode/display.rs
@@ -2100,6 +2100,8 @@ const MNEMONICS: &[&'static str] = &[
     "pvalidate",
     "rmpadjust",
     "rmpupdate",
+
+    "jecxz",
 ];
 
 impl Opcode {
@@ -2699,6 +2701,7 @@ impl <T: fmt::Write, Y: YaxColors> Colorize<T, Y> for Opcode {
             Opcode::LOOPZ |
             Opcode::LOOP |
             Opcode::JRCXZ |
+            Opcode::JECXZ |
             Opcode::CALL |
             Opcode::CALLF |
             Opcode::JMP |
@@ -4018,6 +4021,10 @@ pub(crate) fn contextualize_c<T: DisplaySink>(instr: &Instruction, out: &mut T)
             out.write_str("if rcx == 0 then jmp ")?;
             write_jmp_operand(instr.operand(0), out)?;
         },
+        Opcode::JECXZ => {
+            out.write_str("if ecx == 0 then jmp ")?;
+            write_jmp_operand(instr.operand(0), out)?;
+        },
         Opcode::LOOP => {
             out.write_str("rcx--; if rcx != 0 then jmp ")?;
             write_jmp_operand(instr.operand(0), out)?;
@@ -4216,8 +4223,9 @@ impl <T: fmt::Write, Y: YaxColors> ShowContextual<u64, [Option<alloc::string::St
     }
 }
 
-static RELATIVE_BRANCHES: [Opcode; 22] = [
-    Opcode::JMP, Opcode::CALL, Opcode::JRCXZ,
+static RELATIVE_BRANCHES: [Opcode; 23] = [
+    Opcode::JMP, Opcode::CALL,
+    Opcode::JRCXZ, Opcode::JECXZ,
     Opcode::LOOP, Opcode::LOOPZ, Opcode::LOOPNZ,
     Opcode::JO, Opcode::JNO,
     Opcode::JB, Opcode::JNB,
-- 
cgit v1.1