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runtime: revert entry point on freebsd/arm64

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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: 70064d8126
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>
This commit is contained in:
Rob Nichols
2025-12-22 21:25:08 +00:00
committed by Gopher Robot
parent c1efada1d2
commit 91435be153
1 changed files with 5 additions and 2 deletions
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7
src/runtime/rt0_freebsd_arm64.s
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@@ -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.