xref: /src/tools/arm-elf2aout/sys/exec_aout.h

/*	$NetBSD: exec_aout.h,v 1.1 2018/12/31 13:35:16 christos Exp $	*/

/*
 * Copyright (c) 1993, 1994 Christopher G. Demetriou
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Christopher G. Demetriou.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _SYS_EXEC_AOUT_H_
#define _SYS_EXEC_AOUT_H_

#ifndef N_PAGSIZ
#define	N_PAGSIZ(ex)	(AOUT_LDPGSZ)
#endif

/*
 * Header prepended to each a.out file.
 * only manipulate the a_midmag field via the
 * N_SETMAGIC/N_GET{MAGIC,MID,FLAG} macros below.
 */
struct exec {
	uint32_t a_midmag;	/* htonl(flags<<26 | mid<<16 | magic) */
	uint32_t a_text;		/* text segment size */
	uint32_t a_data;		/* initialized data size */
	uint32_t a_bss;		/* uninitialized data size */
	uint32_t a_syms;		/* symbol table size */
	uint32_t a_entry;	/* entry point */
	uint32_t a_trsize;	/* text relocation size */
	uint32_t a_drsize;	/* data relocation size */
};

/* a_magic */
#define	OMAGIC		0407	/* old impure format */
#define	NMAGIC		0410	/* read-only text */
#define	ZMAGIC		0413	/* demand load format */
#define	QMAGIC		0314	/* "compact" demand load format; deprecated */

#include <sys/aout_mids.h>

/*
 * a_flags
 */
#define	EX_DYNAMIC	0x20
#define	EX_PIC		0x10
#define	EX_DPMASK	0x30
/*
 * Interpretation of the (a_flags & EX_DPMASK) bits:
 *
 *	00		traditional executable or object file
 *	01		object file contains PIC code (set by `as -k')
 *	10		dynamic executable
 *	11		position independent executable image
 * 			(eg. a shared library)
 *
 */

/*
 * The a.out structure's a_midmag field is a network-byteorder encoding
 * of this int
 *	FFFFFFmmmmmmmmmmMMMMMMMMMMMMMMMM
 * Where `F' is 6 bits of flag like EX_DYNAMIC,
 *       `m' is 10 bits of machine-id like MID_I386, and
 *       `M' is 16 bits worth of magic number, ie. ZMAGIC.
 * The macros below will set/get the needed fields.
 */
#define	N_GETMAGIC(ex) \
    ((((ex).a_midmag)&0xffff0000) ? \
    (be32toh((uint32_t)((ex).a_midmag))&0xffff) : ((ex).a_midmag))
#define	N_GETMAGIC2(ex) \
    ((((ex).a_midmag)&0xffff0000) ? \
    (be32toh((uint32_t)((ex).a_midmag))&0xffff) : (((ex).a_midmag) | 0x10000))
#define	N_GETMID(ex) \
    ((((ex).a_midmag)&0xffff0000) ? \
    ((be32toh((uint32_t)((ex).a_midmag))>>16)&0x03ff) : MID_ZERO)
#define	N_GETFLAG(ex) \
    ((((ex).a_midmag)&0xffff0000) ? \
    ((be32toh((uint32_t)((ex).a_midmag))>>26)&0x3f) : 0)
#define	N_SETMAGIC(ex,mag,mid,flag) \
    ((ex).a_midmag = htobe32((uint32_t) \
    ((((flag)&0x3f)<<26)|(((mid)&0x03ff)<<16)|(((mag)&0xffff)))))

#define	N_ALIGN(ex,x) \
	(N_GETMAGIC(ex) == ZMAGIC || N_GETMAGIC(ex) == QMAGIC ? \
	((x) + AOUT_LDPGSZ - 1) & ~(AOUT_LDPGSZ - 1) : (x))

/* Valid magic number check. */
#define	N_BADMAG(ex) \
	(N_GETMAGIC(ex) != NMAGIC && N_GETMAGIC(ex) != OMAGIC && \
	N_GETMAGIC(ex) != ZMAGIC && N_GETMAGIC(ex) != QMAGIC)

/* Address of the bottom of the text segment. */
#define	N_TXTADDR(ex)	(N_GETMAGIC2(ex) == (ZMAGIC|0x10000) ? 0 : AOUT_LDPGSZ)

/* Address of the bottom of the data segment. */
#define	N_DATADDR(ex) \
	(N_GETMAGIC(ex) == OMAGIC ? N_TXTADDR(ex) + (ex).a_text : \
	(N_TXTADDR(ex) + (ex).a_text + AOUT_LDPGSZ - 1) & ~(AOUT_LDPGSZ - 1))

/* Address of the bottom of the bss segment. */
#define	N_BSSADDR(ex) \
	(N_DATADDR(ex) + (ex).a_data)

/* Text segment offset. */
#define	N_TXTOFF(ex) \
	( N_GETMAGIC2(ex)==ZMAGIC || N_GETMAGIC2(ex)==(QMAGIC|0x10000) ? \
	0 : (N_GETMAGIC2(ex)==(ZMAGIC|0x10000) ? AOUT_LDPGSZ : \
	sizeof(struct exec)) )

/* Data segment offset. */
#define	N_DATOFF(ex) \
	N_ALIGN(ex, N_TXTOFF(ex) + (ex).a_text)

/* Text relocation table offset. */
#define	N_TRELOFF(ex) \
	(N_DATOFF(ex) + (ex).a_data)

/* Data relocation table offset. */
#define	N_DRELOFF(ex) \
	(N_TRELOFF(ex) + (ex).a_trsize)

/* Symbol table offset. */
#define	N_SYMOFF(ex) \
	(N_DRELOFF(ex) + (ex).a_drsize)

/* String table offset. */
#define	N_STROFF(ex) \
	(N_SYMOFF(ex) + (ex).a_syms)

#include <machine/aout_machdep.h>

#ifdef _KERNEL

/* the "a.out" format's entry in the exec switch */
int	exec_aout_makecmds(struct lwp *, struct exec_package *);

/* functions which prepare various a.out executable types */
/*
 * MI portion
 */
int	exec_aout_prep_zmagic(struct lwp *, struct exec_package *);
int	exec_aout_prep_nmagic(struct lwp *, struct exec_package *);
int	exec_aout_prep_omagic(struct lwp *, struct exec_package *);

/* For compatibility modules */
int	exec_aout_prep_oldzmagic(struct lwp *, struct exec_package *);
int	exec_aout_prep_oldnmagic(struct lwp *, struct exec_package *);
int	exec_aout_prep_oldomagic(struct lwp *, struct exec_package *);

/*
 * MD portion
 */
#ifndef cpu_exec_aout_makecmds
int	cpu_exec_aout_makecmds(struct lwp *, struct exec_package *);
#endif

#endif /* _KERNEL */

#endif /* !_SYS_EXEC_AOUT_H_ */