Source to arch/i386/boot/asm.h


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/* 
 * Ported to Boot 386BSD by Julian Elsicher ([email protected]) Sept. 1992
 *
 * Mach Operating System
 * Copyright (c) 1991,1990,1989 Carnegie Mellon University
 * All Rights Reserved.
 * 
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 * 
 *  Software Distribution Coordinator  or  [email protected]
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 * 
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */
/* 
 * HISTORY
 * asm.h,v
 * Revision 1.2  1993/07/11  12:02:19  andrew
 * Fixes from bde, including support for loading @ any MB boundary (e.g. a
 * kernel linked for 0xfe100000 will load at the 1MB mark) and read-ahead
 * buffering to speed booting from floppies.  Also works with aha174x
 * controllers in enhanced mode.
 *
 *
 * 93/06/28  bde
 *	Deleted addr16 and data16.  These produce the same prefix bytes as
 *	addr32 and data32 but have confusing names.  There is no way to make
 *	gas produce 16-bit addresses or operand sizes.  Instead, we let it
 *	produce 32-bit addresses and operand sizes and explicitly code the
 *	correct prefix(es) to make the address modes and operand sizes what
 *	gas thinks they are.  It would be safer to use prefixes before
 *	_every_ instruction (there are alleady a lot of unnecessary data32's
 *	before short jumps in case the jumps are actually long).  We must
 *	avoid "word" instructions becuase gas would produce the wrong prefix
 *	and there is no way to cancel a prefix.  We sometimes avoid adding
 *	a prefix using kludges like
 *		"xorl %eax, %eax	# actually xorw %ax, %ax".
 *
 * 93/06/28  bde
 *	Added addr32.
 *
 * Revision 1.1  1993/03/21  18:08:18  cgd
 * after 0.2.2 "stable" patches applied
 *
 * Revision 2.7  92/02/29  15:33:41  rpd
 * 	Added ENTRY2.
 * 	[92/02/28            rpd]
 * 
 * Revision 2.6  92/02/19  15:07:52  elf
 * 	Changed #if __STDC__ to #ifdef __STDC__
 * 	[92/01/16            jvh]
 * 
 * Revision 2.5  91/05/14  16:02:45  mrt
 * 	Correcting copyright
 * 
 * Revision 2.4  91/02/05  17:10:42  mrt
 * 	Changed to new Mach copyright
 * 	[91/02/01  17:30:29  mrt]
 * 
 * Revision 2.3  90/12/20  16:35:27  jeffreyh
 * 	changes for __STDC__
 * 	[90/12/06            jeffreyh]
 * 
 * Revision 2.2  90/05/03  15:24:12  dbg
 * 	First checkin.
 * 
 *
 * 	Typo on ENTRY if gprof
 * 	[90/03/29            rvb]
 * 
 * 	fix SVC for "ifdef wheeze" [kupfer]
 * 	Fix the GPROF definitions.
 * 	ENTRY(x) gets profiled iffdef GPROF.
 * 	Entry(x) (and DATA(x)) is NEVER profiled.
 * 	MCOUNT can be used by asm that intends to build a frame,
 * 	after the frame is built.
 *	[90/02/26            rvb]
 *
 * 	Add #define addr16 .byte 0x67
 * 	[90/02/09            rvb]
 * 	Added LBi, SVC and ENTRY
 * 	[89/11/10  09:51:33  rvb]
 * 
 * 	New a.out and coff compatible .s files.
 * 	[89/10/16            rvb]
 */


#define S_ARG0	 4(%esp)
#define S_ARG1	 8(%esp)
#define S_ARG2	12(%esp)
#define S_ARG3	16(%esp)

#define FRAME	pushl %ebp; movl %esp, %ebp
#define EMARF	leave

#define B_ARG0	 8(%ebp)
#define B_ARG1	12(%ebp)
#define B_ARG2	16(%ebp)
#define B_ARG3	20(%ebp)

#ifdef	wheeze

#define ALIGN 4
#define EXT(x) x
#define LEXT(x) x:
#define LCL(x) ./**/x

#define LB(x,n) ./**/x
#define LBb(x,n) ./**/x
#define LBf(x,n) ./**/x

#define	SVC lcall $7,$0

#define String .string
#define Value  .value
#define Times(a,b) [a\*b]
#define Divide(a,b) [a\\b]

#define INB	inb	(%dx)
#define OUTB	outb	(%dx)
#define INL	inl	(%dx)
#define OUTL	outl	(%dx)

#else	wheeze
#define ALIGN 
#define	LCL(x)	x

#define LB(x,n) n
#ifdef	__STDC__
#define EXT(x) _ ## x
#define LEXT(x) _ ## x ## :

#define LBb(x,n) n ## b
#define LBf(x,n) n ## f
#else __STDC__
#define EXT(x) _/**/x
#define LEXT(x) _/**/x/**/:
#define LBb(x,n) n/**/b
#define LBf(x,n) n/**/f
#endif __STDC__
#define SVC .byte 0x9a; .long 0; .word 0x7

#define String	.ascii
#define Value	.word
#define Times(a,b) (a*b)
#define Divide(a,b) (a/b)

#define INB	inb	%dx, %al
#define OUTB	outb	%al, %dx
#define INL	inl	%dx, %eax
#define OUTL	outl	%eax, %dx

#endif	wheeze

#define addr32	.byte 0x67
#define data32	.byte 0x66

#ifdef GPROF
#ifdef	__STDC__

#define MCOUNT		.data; LB(x, 9); .long 0; .text; lea LBb(x, 9),%edx; call mcount
#define	ENTRY(x)	.globl EXT(x); .align ALIGN; LEXT(x) ; \
			pushl %ebp; movl %esp, %ebp; MCOUNT; popl %ebp;
#define	ENTRY2(x,y)	.globl EXT(x); .globl EXT(y); \
			.align ALIGN; LEXT(x) LEXT(y) ; \
			pushl %ebp; movl %esp, %ebp; MCOUNT; popl %ebp;
#define	ASENTRY(x) 	.globl x; .align ALIGN; x ## : ; \
  			pushl %ebp; movl %esp, %ebp; MCOUNT; popl %ebp;

#else   __STDC__

#define MCOUNT		.data; LB(x, 9): .long 0; .text; lea LBb(x, 9),%edx; call mcount
#define	ENTRY(x)	.globl EXT(x); .align ALIGN; LEXT(x) ; \
			pushl %ebp; movl %esp, %ebp; MCOUNT; popl %ebp;
#define	ENTRY2(x,y)	.globl EXT(x); .globl EXT(y); \
			.align ALIGN; LEXT(x) LEXT(y)
#define	ASENTRY(x) 	.globl x; .align ALIGN; x: ; \
  			pushl %ebp; movl %esp, %ebp; MCOUNT; popl %ebp;

#endif	__STDC__
#else	GPROF
#ifdef	__STDC__

#define MCOUNT
#define	ENTRY(x)	.globl EXT(x); .align ALIGN; LEXT(x)
#define	ENTRY2(x,y)	.globl EXT(x); .globl EXT(y); \
			.align ALIGN; LEXT(x) LEXT(y)
#define	ASENTRY(x)	.globl x; .align ALIGN; x ## :

#else 	__STDC__

#define MCOUNT
#define	ENTRY(x)	.globl EXT(x); .align ALIGN; LEXT(x)
#define	ENTRY2(x,y)	.globl EXT(x); .globl EXT(y); \
			.align ALIGN; LEXT(x) LEXT(y)
#define	ASENTRY(x)	.globl x; .align ALIGN; x:

#endif	__STDC__
#endif	GPROF

#define	Entry(x)	.globl EXT(x); .align ALIGN; LEXT(x)
#define	DATA(x)		.globl EXT(x); .align ALIGN; LEXT(x)