From 1eb3d02d33155831067ca7db2c6517108c4305ae Mon Sep 17 00:00:00 2001
From: pagran <pagran@protonmail.com>
Date: Mon, 9 Jan 2023 13:30:00 +0100
Subject: [PATCH 1/3] add custom magic value

---
 cmd/link/internal/ld/pcln.go | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/cmd/link/internal/ld/pcln.go b/cmd/link/internal/ld/pcln.go
index ea08fd3d31..7bae9f18c5 100644
--- a/cmd/link/internal/ld/pcln.go
+++ b/cmd/link/internal/ld/pcln.go
@@ -4,6 +4,10 @@
 
 package ld
 
+import (
+	"os"
+)
+
 import (
 	"cmd/internal/goobj"
 	"cmd/internal/objabi"
@@ -262,6 +266,19 @@ func (state *pclntab) generatePCHeader(ctxt *Link) {
 		if off != size {
 			panic(fmt.Sprintf("pcHeader size: %d != %d", off, size))
 		}
+
+		// Use garble prefix in variable names to minimize collision risk
+		garbleMagicStr := os.Getenv("GARBLE_LINK_MAGIC")
+		if garbleMagicStr == "" {
+			panic("[garble] magic value must be set")
+		}
+		var garbleMagicVal uint32
+		// Use fmt package instead of strconv to avoid importing a new package
+		if _, err := fmt.Sscan(garbleMagicStr, &garbleMagicVal); err != nil {
+			panic(fmt.Errorf("[garble] invalid magic value %s: %v", garbleMagicStr, err))
+		}
+
+		header.SetUint32(ctxt.Arch, 0, garbleMagicVal)
 	}
 
 	state.pcheader = state.addGeneratedSym(ctxt, "runtime.pcheader", size, writeHeader)
-- 
2.48.1