From: liu-xuewen <liiuxuewen@gmail.com>
Date: Sat, 5 Nov 2022 07:40:49 +0000 (+0000)
Subject: runtime: remove 104 byte stack guard
X-Git-Tag: go1.21rc1~1869
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=57236fe9f72c7dae447f07899e9b5b3bcd06f2af;p=gostls13.git

runtime: remove 104 byte stack guard

The number 104 appears to date back to the
first implementation of split stacks in
https://go.googlesource.com/go/+/b987f7a757f53f460973622a36eebb696f9b5060.
That change introduces a 104 byte stack guard.
it doesn't makes any sense today.

Change-Id: I73069f6d1a827653af63e616f0119fbac809882e
GitHub-Last-Rev: bcf900059047548c1709c6d4cf4649a96ad85e57
GitHub-Pull-Request: golang/go#56594
Reviewed-on: https://go-review.googlesource.com/c/go/+/448036
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
---

diff --git a/src/runtime/asm_amd64.s b/src/runtime/asm_amd64.s
index 13c8de499e..5d163da132 100644
--- a/src/runtime/asm_amd64.s
+++ b/src/runtime/asm_amd64.s
@@ -168,7 +168,7 @@ TEXT runtime·rt0_go(SB),NOSPLIT|TOPFRAME,$0
 	// create istack out of the given (operating system) stack.
 	// _cgo_init may update stackguard.
 	MOVQ	$runtime·g0(SB), DI
-	LEAQ	(-64*1024+104)(SP), BX
+	LEAQ	(-64*1024)(SP), BX
 	MOVQ	BX, g_stackguard0(DI)
 	MOVQ	BX, g_stackguard1(DI)
 	MOVQ	BX, (g_stack+stack_lo)(DI)