github.com/slayercat/go@v0.0.0-20170428012452-c51559813f61/src/runtime/cgo/gcc_mips64x.S (about)

     1  // Copyright 2016 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // +build mips64 mips64le
     6  
     7  /*
     8   * void crosscall1(void (*fn)(void), void (*setg_gcc)(void *g), void *g)
     9   *
    10   * Calling into the gc tool chain, where all registers are caller save.
    11   * Called from standard MIPS N64 ABI, where $16-$23, $28, $30, and $f24-$f31
    12   * are callee-save, so they must be saved explicitly, along with $31 (LR).
    13   */
    14  .globl crosscall1
    15  .set noat
    16  crosscall1:
    17  	daddiu	$29, $29, -160
    18  	sd	$31, 0($29)
    19  	sd	$16, 8($29)
    20  	sd	$17, 16($29)
    21  	sd	$18, 24($29)
    22  	sd	$19, 32($29)
    23  	sd	$20, 40($29)
    24  	sd	$21, 48($29)
    25  	sd	$22, 56($29)
    26  	sd	$23, 64($29)
    27  	sd	$28, 72($29)
    28  	sd	$30, 80($29)
    29  	sdc1	$f24, 88($29)
    30  	sdc1	$f25, 96($29)
    31  	sdc1	$f26, 104($29)
    32  	sdc1	$f27, 112($29)
    33  	sdc1	$f28, 120($29)
    34  	sdc1	$f29, 128($29)
    35  	sdc1	$f30, 136($29)
    36  	sdc1	$f31, 144($29)
    37  
    38  	// prepare SB register = pc & 0xffffffff00000000
    39  	bal	1f
    40  1:
    41  	dsrl	$28, $31, 32
    42  	dsll	$28, $28, 32
    43  
    44  	move	$20, $4 // save R4
    45  	move	$1, $6
    46  	jalr	$5	// call setg_gcc (clobbers R4)
    47  	jalr	$20	// call fn
    48  
    49  	ld	$16, 8($29)
    50  	ld	$17, 16($29)
    51  	ld	$18, 24($29)
    52  	ld	$19, 32($29)
    53  	ld	$20, 40($29)
    54  	ld	$21, 48($29)
    55  	ld	$22, 56($29)
    56  	ld	$23, 64($29)
    57  	ld	$28, 72($29)
    58  	ld	$30, 80($29)
    59  	ldc1	$f24, 88($29)
    60  	ldc1	$f25, 96($29)
    61  	ldc1	$f26, 104($29)
    62  	ldc1	$f27, 112($29)
    63  	ldc1	$f28, 120($29)
    64  	ldc1	$f29, 128($29)
    65  	ldc1	$f30, 136($29)
    66  	ldc1	$f31, 144($29)
    67  	ld	$31, 0($29)
    68  
    69  	daddiu	$29, $29, 160
    70  	jr	$31
    71  
    72  .set at
    73  
    74  #ifdef __ELF__
    75  .section .note.GNU-stack,"",%progbits
    76  #endif