From: Rob Nichols <robert.nichols@dialwave.com>
Date: Mon, 22 Dec 2025 21:25:08 +0000 (+0000)
Subject: runtime: revert entry point on freebsd/arm64
X-Git-Url: https://git.feebdaed.xyz/?a=commitdiff_plain;h=91435be1531727f3220a8fdebb7e4894f39edb41;p=0xmirror%2Fgo.git

runtime: revert entry point on freebsd/arm64

CL 706175 unified some arm64 entry points. However, the entry point for
freebsd/arm64 is incorrect and builds now fail. This change reverts the
freebsd/arm64 entry point and adds additional context for the future.

Fixes #76958

Change-Id: Ib9e9b7844706f7b0ef54bd449411fefc8f10bc43
GitHub-Last-Rev: 70064d8126f8ff7e2c0e5e8d4b00177c627f4d76
GitHub-Pull-Request: golang/go#76959
Reviewed-on: https://go-review.googlesource.com/c/go/+/731980
Auto-Submit: Austin Clements <austin@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
---

diff --git a/src/runtime/rt0_freebsd_arm64.s b/src/runtime/rt0_freebsd_arm64.s
index a7a952664e..93562c5dd0 100644
--- a/src/runtime/rt0_freebsd_arm64.s
+++ b/src/runtime/rt0_freebsd_arm64.s
@@ -4,9 +4,12 @@
 
 #include "textflag.h"
 
-// On FreeBSD argc/argv are passed in R0, not RSP
+// FreeBSD passes a pointer to the argument block in R0, not RSP,
+// so _rt0_arm64 cannot be used.
 TEXT _rt0_arm64_freebsd(SB),NOSPLIT,$0
-	JMP	_rt0_arm64(SB)
+	ADD	$8, R0, R1	// argv (use R0 while it's still the pointer)
+	MOVD	0(R0), R0	// argc
+	JMP	runtime·rt0_go(SB)
 
 // When building with -buildmode=c-shared, this symbol is called when the shared
 // library is loaded.