From 5ddad3638071f1c084d77239503e3de0c509810b Mon Sep 17 00:00:00 2001
From: Ryan Fleury <ryan.j.fleury@gmail.com>
Date: Tue, 9 Jun 2026 16:18:47 -0700
Subject: [PATCH] zero undefined registers in eh unwind

---
 src/eh_frame/unwind/eh_frame_unwind.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/eh_frame/unwind/eh_frame_unwind.c b/src/eh_frame/unwind/eh_frame_unwind.c
index 40b42e5f..0fedf232 100644
--- a/src/eh_frame/unwind/eh_frame_unwind.c
+++ b/src/eh_frame/unwind/eh_frame_unwind.c
@@ -570,8 +570,11 @@ eh_uwnd_step(Arch arch, MemoryMap *memory_map, UWND_ModuleInfo *module_info, U64
       switch(rule->code)
       {
         default:
-        case DW_UnwindRuleCode_Undefined:
         case DW_UnwindRuleCode_SameVal:{}break;
+        case DW_UnwindRuleCode_Undefined:
+        {
+          MemoryZero((U8 *)regs + reg_rng.min, reg_size);
+        }break;
         case DW_UnwindRuleCode_Off:
         {
           Temp temp = temp_begin(scratch.arena);