Text file src/runtime/cgo/gcc_386.S

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

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