From e42788628aa787cac8d7c61d593f6a17b9c42d08 Mon Sep 17 00:00:00 2001
From: Akshat Kumar <seed@mail.nanosouffle.net>
Date: Mon, 24 Sep 2012 12:24:45 -0400
Subject: [PATCH] cmd/dist, pkg/runtime: Plan 9, 64-bit: Get PID from TLS;
 remove use of `_tos'.

Using offsets from Tos is cumbersome and we've had problems
in the past. Since it's only being used to grab the PID, we'll just
get that from the default TLS instead.

R=rsc, rminnich, npe
CC=golang-dev
https://golang.org/cl/6543049
---
 src/cmd/dist/buildruntime.c        | 6 ++++++
 src/pkg/runtime/defs_plan9_amd64.h | 1 -
 src/pkg/runtime/rt0_plan9_amd64.s  | 2 --
 src/pkg/runtime/sys_plan9_amd64.s  | 5 ++---
 4 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/src/cmd/dist/buildruntime.c b/src/cmd/dist/buildruntime.c
index d3ab197461..f22174e792 100644
--- a/src/cmd/dist/buildruntime.c
+++ b/src/cmd/dist/buildruntime.c
@@ -145,6 +145,12 @@ static struct {
 		"#define	g(r) 0(r)\n"
 		"#define	m(r) 8(r)\n"
 	},
+	{"amd64", "plan9",
+		"#define	get_tls(r)\n"
+		"#define	g(r) 0(GS)\n"
+		"#define	m(r) 8(GS)\n"
+		"#define	procid(r) 16(GS)\n"
+	},
 	{"amd64", "",
 		"// The offsets 0 and 8 are known to:\n"
 		"//	../../cmd/6l/pass.c:/D_GS\n"
diff --git a/src/pkg/runtime/defs_plan9_amd64.h b/src/pkg/runtime/defs_plan9_amd64.h
index 8c324ea584..d5d19f8be3 100644
--- a/src/pkg/runtime/defs_plan9_amd64.h
+++ b/src/pkg/runtime/defs_plan9_amd64.h
@@ -1,3 +1,2 @@
 // nothing to see here
-#define tos_pid 64
 #define PAGESIZE 0x200000ULL
diff --git a/src/pkg/runtime/rt0_plan9_amd64.s b/src/pkg/runtime/rt0_plan9_amd64.s
index 499413a831..2b1fa2ae1d 100644
--- a/src/pkg/runtime/rt0_plan9_amd64.s
+++ b/src/pkg/runtime/rt0_plan9_amd64.s
@@ -3,11 +3,9 @@
 // license that can be found in the LICENSE file.
 
 TEXT _rt0_amd64_plan9(SB),7, $0
-	MOVQ	AX, _tos(SB)
 	MOVQ	$_rt0_amd64(SB), AX
 	MOVQ	SP, DI
 	JMP	AX
 
 DATA runtime·isplan9(SB)/4, $1
 GLOBL runtime·isplan9(SB), $4
-GLOBL _tos(SB), $8
diff --git a/src/pkg/runtime/sys_plan9_amd64.s b/src/pkg/runtime/sys_plan9_amd64.s
index cc343d170a..f376620924 100644
--- a/src/pkg/runtime/sys_plan9_amd64.s
+++ b/src/pkg/runtime/sys_plan9_amd64.s
@@ -105,9 +105,8 @@ TEXT runtime·rfork(SB),7,$0
 	MOVQ	DX, g(AX)
 	MOVQ	BX, m(AX)
 
-	// Initialize AX from _tos->pid
-	MOVQ	_tos(SB), AX
-	MOVQ	tos_pid(AX), AX
+	// Initialize AX from pid in TLS.
+	MOVQ	procid(AX), AX
 	MOVQ	AX, m_procid(BX)	// save pid as m->procid
 	
 	CALL	runtime·stackcheck(SB)	// smashes AX, CX
-- 
2.48.1