Text file src/runtime/cgo/gcc_mips64x.S

     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	#ifndef __mips_soft_float
    18		daddiu	$29, $29, -160
    19	#else
    20		daddiu	$29, $29, -96 // For soft-float, no need to make room for FP registers
    21	#endif
    22		sd	$31, 0($29)
    23		sd	$16, 8($29)
    24		sd	$17, 16($29)
    25		sd	$18, 24($29)
    26		sd	$19, 32($29)
    27		sd	$20, 40($29)
    28		sd	$21, 48($29)
    29		sd	$22, 56($29)
    30		sd	$23, 64($29)
    31		sd	$28, 72($29)
    32		sd	$30, 80($29)
    33	#ifndef __mips_soft_float
    34		sdc1	$f24, 88($29)
    35		sdc1	$f25, 96($29)
    36		sdc1	$f26, 104($29)
    37		sdc1	$f27, 112($29)
    38		sdc1	$f28, 120($29)
    39		sdc1	$f29, 128($29)
    40		sdc1	$f30, 136($29)
    41		sdc1	$f31, 144($29)
    42	#endif
    43	
    44		// prepare SB register = pc & 0xffffffff00000000
    45		bal	1f
    46	1:
    47		dsrl	$28, $31, 32
    48		dsll	$28, $28, 32
    49	
    50		move	$20, $4 // save R4
    51		move	$1, $6
    52		jalr	$5	// call setg_gcc (clobbers R4)
    53		jalr	$20	// call fn
    54	
    55		ld	$16, 8($29)
    56		ld	$17, 16($29)
    57		ld	$18, 24($29)
    58		ld	$19, 32($29)
    59		ld	$20, 40($29)
    60		ld	$21, 48($29)
    61		ld	$22, 56($29)
    62		ld	$23, 64($29)
    63		ld	$28, 72($29)
    64		ld	$30, 80($29)
    65	#ifndef __mips_soft_float
    66		ldc1	$f24, 88($29)
    67		ldc1	$f25, 96($29)
    68		ldc1	$f26, 104($29)
    69		ldc1	$f27, 112($29)
    70		ldc1	$f28, 120($29)
    71		ldc1	$f29, 128($29)
    72		ldc1	$f30, 136($29)
    73		ldc1	$f31, 144($29)
    74	#endif
    75		ld	$31, 0($29)
    76	#ifndef __mips_soft_float
    77		daddiu	$29, $29, 160
    78	#else
    79		daddiu	$29, $29, 96
    80	#endif
    81		jr	$31
    82	
    83	.set at
    84	
    85	#ifdef __ELF__
    86	.section .note.GNU-stack,"",%progbits
    87	#endif

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