src/runtime/tls_arm64.s

// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

#include "go_asm.h"
#include "go_tls.h"
#include "funcdata.h"
#include "textflag.h"
#include "tls_arm64.h"

TEXT runtime·load_g(SB),NOSPLIT,$0
	MOVB	runtime·iscgo(SB), R0
	CMP	$0, R0
	BEQ	nocgo

	MRS_TPIDR_R0
#ifdef GOOS_darwin
	// Darwin sometimes returns unaligned pointers
	AND	$0xfffffffffffffff8, R0
#endif
	MOVD	runtime·tls_g(SB), R27
	ADD	R27, R0
	MOVD	0(R0), g

nocgo:
	RET

TEXT runtime·save_g(SB),NOSPLIT,$0
	MOVB	runtime·iscgo(SB), R0
	CMP	$0, R0
	BEQ	nocgo

	MRS_TPIDR_R0
#ifdef GOOS_darwin
	// Darwin sometimes returns unaligned pointers
	AND	$0xfffffffffffffff8, R0
#endif
	MOVD	runtime·tls_g(SB), R27
	ADD	R27, R0
	MOVD	g, 0(R0)

nocgo:
	RET

#ifdef TLSG_IS_VARIABLE
#ifdef GOOS_android
// Use the free TLS_SLOT_APP slot #2 on Android Q.
// Earlier androids are set up in gcc_android.c.
DATA runtime·tls_g+0(SB)/8, $16
#endif
GLOBL runtime·tls_g+0(SB), NOPTR, $8
#else
GLOBL runtime·tls_g+0(SB), TLSBSS, $8
#endif