usr/src/sys/sparc/include/exec.h

/*
 * Copyright (c) 1992 The Regents of the University of California.
 * All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)exec.h      7.1 (Berkeley) %G%
 *
 * from: $Header: exec.h,v 1.7 92/07/01 23:51:32 torek Exp $
 */

/*
 * __LDPGSZ is the page size used by the linker and by exec().
 * It may be some multiple of the ``normal'' page size, so that, e.g.,
 * the same binaries can be run on hardware with different page sizes
 * that otherwise use the same instruction set.  It must be no larger
 * than CLBYTES (in param.h).
 */
#define __LDPGSZ        8192

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

/*
 * N_TXTADDR is the address of the first executable instruction: that is,
 * the place the pc could begin after an a.out is loaded, in order to run
 * the instructions in that a.out.  The pc will actually be set to ex.a_entry
 * but this is the first place it could possibly reference.
 *
 * On the SPARC, binaries begin at __LDPGSZ, i.e., page 1.
 */
#define N_TXTADDR(ex)   8192

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

/*
 * N_TXTOFF is the offset within an a.out file of the first executable
 * instruction: that is, the offset in the a.out of the byte that winds
 * up at N_TXTADDR.
 *
 * On the SPARC, the a.out header is included in the executable when running
 * a ZMAGIC file (but not for OMAGIC and NMAGIC).
 */
#define N_TXTOFF(ex)    ((ex).a_magic == ZMAGIC ? 0 : sizeof(struct exec))

/* Data segment offset. */
#define N_DATOFF(ex) \
        (N_TXTOFF(ex) + ((ex).a_magic != ZMAGIC ? (ex).a_text : \
        __LDPGSZ + ((ex).a_text - 1 & ~(__LDPGSZ - 1))))

/* Symbol table offset. */
#define N_SYMOFF(ex) \
        (N_TXTOFF(ex) + (ex).a_text + (ex).a_data + (ex).a_trsize + \
            (ex).a_drsize)

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

/* Description of the object file header (a.out format). */
struct exec {
        u_char  a_dynamic:1;    /* dynamically linked */
        u_char  a_toolversion:7;/* Sun toolset version  XXX */

#define MID_ZERO        0       /* unknown - implementation dependent */
#define MID_SUN010      1       /* sun 68010/68020 binary */
#define MID_SUN020      2       /* sun 68020-only binary */
#define MID_SUN_SPARC   3       /* sparc binary */
#define MID_HP200       200     /* hp200 (68010) BSD binary */
#define MID_HP300       300     /* hp300 (68020+68881) BSD binary */
#define MID_HPUX        0x20C   /* hp200/300 HP-UX binary */
#define MID_HPUX800     0x20B   /* hp800 HP-UX binary */
        u_char  a_mid;          /* machine ID */

#define OMAGIC  0407            /* old impure format */
#define NMAGIC  0410            /* read-only text */
#define ZMAGIC  0413            /* demand load format */
        u_short a_magic;        /* magic number */

        u_long  a_text;         /* text segment size */
        u_long  a_data;         /* initialized data size */
        u_long  a_bss;          /* uninitialized data size */
        u_long  a_syms;         /* symbol table size */
        u_long  a_entry;        /* entry point */
        u_long  a_trsize;       /* text relocation size */
        u_long  a_drsize;       /* data relocation size */
};
#define a_machtype      a_mid   /* SUN compatibility */