// Copyright 2016 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.

//go:build mips64 || mips64le

.file "gcc_mips64x.S"

/*

* void crosscall1(void (*fn)(void), void (*setg_gcc)(void *g), void *g)

*

* Calling into the gc tool chain, where all registers are caller save.

* Called from standard MIPS N64 ABI, where $16-$23, $28, $30, and $f24-$f31

* are callee-save, so they must be saved explicitly, along with $31 (LR).

*/

.globl crosscall1

.set noat

crosscall1:

#ifndef __mips_soft_float

daddiu $29, $29, -160

#else

daddiu $29, $29, -96 // For soft-float, no need to make room for FP registers

#endif

sd $31, 0($29)

sd $16, 8($29)

sd $17, 16($29)

sd $18, 24($29)

sd $19, 32($29)

sd $20, 40($29)

sd $21, 48($29)

sd $22, 56($29)

sd $23, 64($29)

sd $28, 72($29)

sd $30, 80($29)

#ifndef __mips_soft_float

sdc1 $f24, 88($29)

sdc1 $f25, 96($29)

sdc1 $f26, 104($29)

sdc1 $f27, 112($29)

sdc1 $f28, 120($29)

sdc1 $f29, 128($29)

sdc1 $f30, 136($29)

sdc1 $f31, 144($29)

#endif

// prepare SB register = pc & 0xffffffff00000000

bal 1f

1:

dsrl $28, $31, 32

dsll $28, $28, 32

move $20, $4 // save R4

move $1, $6

jalr $5 // call setg_gcc (clobbers R4)

jalr $20 // call fn

ld $16, 8($29)

ld $17, 16($29)

ld $18, 24($29)

ld $19, 32($29)

ld $20, 40($29)

ld $21, 48($29)

ld $22, 56($29)

ld $23, 64($29)

ld $28, 72($29)

ld $30, 80($29)

#ifndef __mips_soft_float

ldc1 $f24, 88($29)

ldc1 $f25, 96($29)

ldc1 $f26, 104($29)

ldc1 $f27, 112($29)

ldc1 $f28, 120($29)

ldc1 $f29, 128($29)

ldc1 $f30, 136($29)

ldc1 $f31, 144($29)

#endif

ld $31, 0($29)

#ifndef __mips_soft_float

daddiu $29, $29, 160

#else

daddiu $29, $29, 96

#endif

jr $31

.set at

#ifdef __ELF__

.section .note.GNU-stack,"",%progbits

#endif