github.com/twelsh-aw/go/src@v0.0.0-20230516233729-a56fe86a7c81/runtime/cgo/gcc_386.S (about)

     1  // Copyright 2009 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_386.S"
     6  
     7  /*
     8   * Windows still insists on underscore prefixes for C function names.
     9   */
    10  #if defined(_WIN32)
    11  #define EXT(s) _##s
    12  #else
    13  #define EXT(s) s
    14  #endif
    15  
    16  /*
    17   * void crosscall_386(void (*fn)(void))
    18   *
    19   * Calling into the 8c tool chain, where all registers are caller save.
    20   * Called from standard x86 ABI, where %ebp, %ebx, %esi,
    21   * and %edi are callee-save, so they must be saved explicitly.
    22   */
    23  .globl EXT(crosscall_386)
    24  EXT(crosscall_386):
    25  	pushl %ebp
    26  	movl %esp, %ebp
    27  	pushl %ebx
    28  	pushl %esi
    29  	pushl %edi
    30  
    31  	movl 8(%ebp), %eax	/* fn */
    32  	call *%eax
    33  
    34  	popl %edi
    35  	popl %esi
    36  	popl %ebx
    37  	popl %ebp
    38  	ret
    39  
    40  #ifdef __ELF__
    41  .section .note.GNU-stack,"",@progbits
    42  #endif