coff.h

完整的Bell实验室的嵌入式文件系统TFS

/* coff.h:
 *  Header file used for the COFF file format of TFS.
 *
 *  General notice:
 *  This code is part of a boot-monitor package developed as a generic base
 *  platform for embedded system designs.  As such, it is likely to be
 *  distributed to various projects beyond the control of the original
 *  author.  Please notify the author of any enhancements made or bugs found
 *  so that all may benefit from the changes.  In addition, notification back
 *  to the author will allow the new user to pick up changes that may have
 *  been made by other users after this version of the code was distributed.
 *
 *  Note1: the majority of this code was edited with 4-space tabs.
 *  Note2: as more and more contributions are accepted, the term "author"
 *         is becoming a mis-representation of credit.
 *
 *  Original author:    Ed Sutter
 *  Email:              [e-mail]
 *  Phone:              908-582-2351
 */

/* File header... */
struct filehdr {
    unsigned short  f_magic;    /* magic number */
    unsigned short  f_nscns;    /* number of sections */
    long            f_timdat;   /* time & date stamp */
    long            f_symptr;   /* file pointer to symtab */
    long            f_nsyms;    /* number of symtab entries */
    unsigned short  f_opthdr;   /* sizeof(optional hdr) */
    unsigned short  f_flags;    /* flags */
};

#define FILHDR  struct filehdr
#define FILHSZ  sizeof(FILHDR)
#define F_EXEC  0000002

/* Optional header... */
struct aouthdr {
    short   magic;  
    short   vstamp;     /* version stamp            */
    long    tsize;      /* text size in bytes, padded to FW
                           bdry                 */
    long    dsize;      /* initialized data "  "        */
    long    bsize;      /* uninitialized data "   "     */
    long    entry;      /* entry pt.                */
    long    text_start; /* base of text used for this file  */
    long    data_start; /* base of data used for this file  */
};

#define AOUTHDR struct aouthdr
#define AOUTHSZ sizeof(AOUTHDR)

struct scnhdr {
    char        s_name[8];  /* section name */
    long        s_paddr;    /* physical address */
    long        s_vaddr;    /* virtual address */
    long        s_size;     /* section size */
    long        s_scnptr;   /* file ptr to raw data for section */
    long        s_relptr;   /* file ptr to relocation */
    long        s_lnnoptr;  /* file ptr to line numbers */
    unsigned short  s_nreloc;   /* number of relocation entries */
    unsigned short  s_nlnno;    /* number of line number entries */
    long        s_flags;    /* flags */
};

#define SCNHDR  struct scnhdr
#define SCNHSZ  sizeof(SCNHDR)

/*
 * The low 4 bits of s_flags is used as a section "type"
 */

#define STYP_REG    0x00        /* "regular" section:
                                    allocated, relocated, loaded */
#define STYP_DSECT  0x01        /* "dummy" section:
                                    not allocated, relocated,
                                    not loaded */
#define STYP_NOLOAD 0x02        /* "noload" section:
                                    allocated, relocated,
                                     not loaded */
#define STYP_GROUP  0x04        /* "grouped" section:
                                    formed of input sections */
#define STYP_PAD    0x08        /* "padding" section:
                                    not allocated, not relocated,
                                     loaded */
#define STYP_COPY   0x10        /* "copy" section:
                                    for decision function used
                                    by field update;  not
                                    allocated, not relocated,
                                    loaded;  reloc & lineno
                                    entries processed normally */
#define STYP_TEXT   0x20        /* section contains text only */
#define STYP_DATA   0x40        /* section contains data only */
#define STYP_BSS    0x80        /* section contains bss only */
#define STYP_INFO   0x0200
#define STYP_LIT    0x8020
#define STYP_ABS    0x4000
#define STYP_BSSREG 0x1200
#define STYP_ENVIR  0x2200

#define ISLOADABLE(flags) \
    (flags & (STYP_ABS | STYP_TEXT | STYP_LIT | STYP_DATA))
#define ISBSS(flags) (flags & (STYP_BSS))
#define ISTEXT(flags) (flags & (STYP_TEXT))