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Text file src/runtime/cgo/gcc_arm64.S

Documentation: runtime/cgo

     1	// Copyright 2015 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	/*
     6	 * Apple still insists on underscore prefixes for C function names.
     7	 */
     8	#if defined(__APPLE__)
     9	#define EXT(s) _##s
    10	#else
    11	#define EXT(s) s
    12	#endif
    13	
    14	// Apple's ld64 wants 4-byte alignment for ARM code sections.
    15	// .align in both Apple as and GNU as treat n as aligning to 2**n bytes.
    16	.align	2
    17	
    18	/*
    19	 * void crosscall1(void (*fn)(void), void (*setg_gcc)(void *g), void *g)
    20	 *
    21	 * Calling into the gc tool chain, where all registers are caller save.
    22	 * Called from standard ARM EABI, where x19-x29 are callee-save, so they
    23	 * must be saved explicitly, along with x30 (LR).
    24	 */
    25	.globl EXT(crosscall1)
    26	EXT(crosscall1):
    27		stp x19, x20, [sp, #-16]!
    28		stp x21, x22, [sp, #-16]!
    29		stp x23, x24, [sp, #-16]!
    30		stp x25, x26, [sp, #-16]!
    31		stp x27, x28, [sp, #-16]!
    32		stp x29, x30, [sp, #-16]!
    33		mov x29, sp
    34	
    35		mov x19, x0
    36		mov x20, x1
    37		mov x0, x2
    38	
    39		blr x20
    40		blr x19
    41	
    42		ldp x29, x30, [sp], #16
    43		ldp x27, x28, [sp], #16
    44		ldp x25, x26, [sp], #16
    45		ldp x23, x24, [sp], #16
    46		ldp x21, x22, [sp], #16
    47		ldp x19, x20, [sp], #16
    48		ret
    49	
    50	
    51	#ifdef __ELF__
    52	.section .note.GNU-stack,"",%progbits
    53	#endif

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