// Copyright 2015 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.

.file "gcc_arm64.S"

/*

* Apple still insists on underscore prefixes for C function names.

*/

#if defined(__APPLE__)

#define EXT(s) _##s

#else

#define EXT(s) s

#endif

// Apple's ld64 wants 4-byte alignment for ARM code sections.

// .align in both Apple as and GNU as treat n as aligning to 2**n bytes.

.align 2

/*

* 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 ARM EABI, where x19-x29 are callee-save, so they

* must be saved explicitly, along with x30 (LR).

*/

.globl EXT(crosscall1)

EXT(crosscall1):

.cfi_startproc

stp x29, x30, [sp, #-96]!

.cfi_def_cfa_offset 96

.cfi_offset 29, -96

.cfi_offset 30, -88

mov x29, sp

.cfi_def_cfa_register 29

stp x19, x20, [sp, #80]

.cfi_offset 19, -16

.cfi_offset 20, -8

stp x21, x22, [sp, #64]

.cfi_offset 21, -32

.cfi_offset 22, -24

stp x23, x24, [sp, #48]

.cfi_offset 23, -48

.cfi_offset 24, -40

stp x25, x26, [sp, #32]

.cfi_offset 25, -64

.cfi_offset 26, -56

stp x27, x28, [sp, #16]

.cfi_offset 27, -80

.cfi_offset 28, -72

mov x19, x0

mov x20, x1

mov x0, x2

blr x20

blr x19

ldp x27, x28, [sp, #16]

.cfi_restore 27

.cfi_restore 28

ldp x25, x26, [sp, #32]

.cfi_restore 25

.cfi_restore 26

ldp x23, x24, [sp, #48]

.cfi_restore 23

.cfi_restore 24

ldp x21, x22, [sp, #64]

.cfi_restore 21

.cfi_restore 22

ldp x19, x20, [sp, #80]

.cfi_restore 19

.cfi_restore 20

ldp x29, x30, [sp], #96

.cfi_restore 29

.cfi_restore 30

.cfi_def_cfa 31, 0

ret

.cfi_endproc

#ifdef __ELF__

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

#endif