github.com/twelsh-aw/go/src@v0.0.0-20230516233729-a56fe86a7c81/runtime/cgo/gcc_arm64.S (about)

     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  .file "gcc_arm64.S"
     6  
     7  /*
     8   * Apple still insists on underscore prefixes for C function names.
     9   */
    10  #if defined(__APPLE__)
    11  #define EXT(s) _##s
    12  #else
    13  #define EXT(s) s
    14  #endif
    15  
    16  // Apple's ld64 wants 4-byte alignment for ARM code sections.
    17  // .align in both Apple as and GNU as treat n as aligning to 2**n bytes.
    18  .align	2
    19  
    20  /*
    21   * void crosscall1(void (*fn)(void), void (*setg_gcc)(void *g), void *g)
    22   *
    23   * Calling into the gc tool chain, where all registers are caller save.
    24   * Called from standard ARM EABI, where x19-x29 are callee-save, so they
    25   * must be saved explicitly, along with x30 (LR).
    26   */
    27  .globl EXT(crosscall1)
    28  EXT(crosscall1):
    29  	.cfi_startproc
    30  	stp x29, x30, [sp, #-96]!
    31  	.cfi_def_cfa_offset 96
    32  	.cfi_offset 29, -96
    33  	.cfi_offset 30, -88
    34  	mov x29, sp
    35  	.cfi_def_cfa_register 29
    36  	stp x19, x20, [sp, #80]
    37  	.cfi_offset 19, -16
    38  	.cfi_offset 20, -8
    39  	stp x21, x22, [sp, #64]
    40  	.cfi_offset 21, -32
    41  	.cfi_offset 22, -24
    42  	stp x23, x24, [sp, #48]
    43  	.cfi_offset 23, -48
    44  	.cfi_offset 24, -40
    45  	stp x25, x26, [sp, #32]
    46  	.cfi_offset 25, -64
    47  	.cfi_offset 26, -56
    48  	stp x27, x28, [sp, #16]
    49  	.cfi_offset 27, -80
    50  	.cfi_offset 28, -72
    51  
    52  	mov x19, x0
    53  	mov x20, x1
    54  	mov x0, x2
    55  
    56  	blr x20
    57  	blr x19
    58  
    59  	ldp x27, x28, [sp, #16]
    60  	.cfi_restore 27
    61  	.cfi_restore 28
    62  	ldp x25, x26, [sp, #32]
    63  	.cfi_restore 25
    64  	.cfi_restore 26
    65  	ldp x23, x24, [sp, #48]
    66  	.cfi_restore 23
    67  	.cfi_restore 24
    68  	ldp x21, x22, [sp, #64]
    69  	.cfi_restore 21
    70  	.cfi_restore 22
    71  	ldp x19, x20, [sp, #80]
    72  	.cfi_restore 19
    73  	.cfi_restore 20
    74  	ldp x29, x30, [sp], #96
    75  	.cfi_restore 29
    76  	.cfi_restore 30
    77  	.cfi_def_cfa 31, 0
    78  	ret
    79  	.cfi_endproc
    80  
    81  
    82  #ifdef __ELF__
    83  .section .note.GNU-stack,"",%progbits
    84  #endif