src/libcgo/386.S

// Copyright 2009 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.

/*
 * Apple still insists on underscore prefixes for C function names.
 */
#if defined(__APPLE__) || defined(__MINGW32__)
#define EXT(s) _##s
#else
#define EXT(s) s
#endif

/*
 * void crosscall_386(void (*fn)(void))
 *
 * Calling into the 8c tool chain, where all registers are caller save.
 * Called from standard x86 ABI, where %ebp, %ebx, %esi,
 * and %edi are callee-save, so they must be saved explicitly.
 */
.globl EXT(crosscall_386)
EXT(crosscall_386):
	pushl %ebp
	movl %esp, %ebp
	pushl %ebx
	pushl %esi
	pushl %edi

	movl 8(%ebp), %eax	/* fn */
	call *%eax

	popl %edi
	popl %esi
	popl %ebx
	popl %ebp
	ret

/*
 * void crosscall2(void (*fn)(void*, int32), void*, int32)
 *
 * Save registers and call fn with two arguments.
 */
.globl EXT(crosscall2)
EXT(crosscall2):
	pushl %ebp
	movl %esp, %ebp
	pushl %ebx
	pushl %esi
	pushl %edi

	pushl 16(%ebp)
	pushl 12(%ebp)
	mov 8(%ebp), %eax
	call *%eax
	addl $8,%esp

	popl %edi
	popl %esi
	popl %ebx
	popl %ebp
	ret