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Text file src/runtime/cgo/gcc_mipsx.S

Documentation: runtime/cgo

     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 mips mipsle
     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 O32 ABI, where $16-$23, $30, and $f20-$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		addiu	$29, $29, -88
    19	#else
    20		addiu	$29, $29, -40 // For soft-float, no need to make room for FP registers
    21	#endif
    22		sw	$31, 0($29)
    23		sw	$16, 4($29)
    24		sw	$17, 8($29)
    25		sw	$18, 12($29)
    26		sw	$19, 16($29)
    27		sw	$20, 20($29)
    28		sw	$21, 24($29)
    29		sw	$22, 28($29)
    30		sw	$23, 32($29)
    31		sw	$30, 36($29)
    32	
    33	#ifndef __mips_soft_float
    34		sdc1	$f20, 40($29)
    35		sdc1	$f22, 48($29)
    36		sdc1	$f24, 56($29)
    37		sdc1	$f26, 64($29)
    38		sdc1	$f28, 72($29)
    39		sdc1	$f30, 80($29)
    40	#endif
    41		move	$20, $4 // save R4
    42		move	$4, $6
    43		jalr	$5	// call setg_gcc
    44		jalr	$20	// call fn
    45	
    46		lw	$16, 4($29)
    47		lw	$17, 8($29)
    48		lw	$18, 12($29)
    49		lw	$19, 16($29)
    50		lw	$20, 20($29)
    51		lw	$21, 24($29)
    52		lw	$22, 28($29)
    53		lw	$23, 32($29)
    54		lw	$30, 36($29)
    55	#ifndef __mips_soft_float
    56		ldc1	$f20, 40($29)
    57		ldc1	$f22, 48($29)
    58		ldc1	$f24, 56($29)
    59		ldc1	$f26, 64($29)
    60		ldc1	$f28, 72($29)
    61		ldc1	$f30, 80($29)
    62	#endif
    63		lw	$31, 0($29)
    64	#ifndef __mips_soft_float
    65		addiu	$29, $29, 88
    66	#else
    67		addiu	$29, $29, 40
    68	#endif
    69		jr	$31
    70	
    71	.set at
    72	
    73	#ifdef __ELF__
    74	.section .note.GNU-stack,"",%progbits
    75	#endif

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