352 lines
12 KiB
C
352 lines
12 KiB
C
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/* This file is derived from the GAS 2.1.4 assembler control file.
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The GAS product is under the GNU General Public License, version 2 or later.
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As such, this file is also under that license.
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If the file format changes in the COFF object, this file should be
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subsequently updated to reflect the changes.
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The actual loader module only uses a few of these structures. The full
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set is documented here because I received the full set. If you wish
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more information about COFF, then O'Reilly has a very excellent book.
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*/
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#define E_SYMNMLEN 8 /* Number of characters in a symbol name */
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#define E_FILNMLEN 14 /* Number of characters in a file name */
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#define E_DIMNUM 4 /* Number of array dimensions in auxiliary entry */
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/*
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* These defines are byte order independent. There is no alignment of fields
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* permitted in the structures. Therefore they are declared as characters
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* and the values loaded from the character positions. It also makes it
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* nice to have it "endian" independent.
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*/
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/* Load a short int from the following tables with little-endian formats */
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#define COFF_SHORT_L(ps) ((short)(((unsigned short)((unsigned char)ps[1])<<8)|\
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((unsigned short)((unsigned char)ps[0]))))
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/* Load a long int from the following tables with little-endian formats */
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#define COFF_LONG_L(ps) (((long)(((unsigned long)((unsigned char)ps[3])<<24) |\
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((unsigned long)((unsigned char)ps[2])<<16) |\
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((unsigned long)((unsigned char)ps[1])<<8) |\
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((unsigned long)((unsigned char)ps[0])))))
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/* Load a short int from the following tables with big-endian formats */
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#define COFF_SHORT_H(ps) ((short)(((unsigned short)((unsigned char)ps[0])<<8)|\
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((unsigned short)((unsigned char)ps[1]))))
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/* Load a long int from the following tables with big-endian formats */
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#define COFF_LONG_H(ps) (((long)(((unsigned long)((unsigned char)ps[0])<<24) |\
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((unsigned long)((unsigned char)ps[1])<<16) |\
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((unsigned long)((unsigned char)ps[2])<<8) |\
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((unsigned long)((unsigned char)ps[3])))))
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/* These may be overridden later by brain dead implementations which generate
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a big-endian header with little-endian data. In that case, generate a
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replacement macro which tests a flag and uses either of the two above
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as appropriate. */
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#define COFF_LONG(v) COFF_LONG_L(v)
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#define COFF_SHORT(v) COFF_SHORT_L(v)
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/*** coff information for Intel 386/486. */
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/********************** FILE HEADER **********************/
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struct COFF_filehdr {
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char f_magic[2]; /* magic number */
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char f_nscns[2]; /* number of sections */
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char f_timdat[4]; /* time & date stamp */
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char f_symptr[4]; /* file pointer to symtab */
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char f_nsyms[4]; /* number of symtab entries */
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char f_opthdr[2]; /* sizeof(optional hdr) */
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char f_flags[2]; /* flags */
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};
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/*
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* Bits for f_flags:
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*
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* F_RELFLG relocation info stripped from file
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* F_EXEC file is executable (i.e. no unresolved external
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* references)
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* F_LNNO line numbers stripped from file
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* F_LSYMS local symbols stripped from file
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* F_MINMAL this is a minimal object file (".m") output of fextract
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* F_UPDATE this is a fully bound update file, output of ogen
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* F_SWABD this file has had its bytes swabbed (in names)
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* F_AR16WR this file has the byte ordering of an AR16WR
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* (e.g. 11/70) machine
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* F_AR32WR this file has the byte ordering of an AR32WR machine
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* (e.g. vax and iNTEL 386)
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* F_AR32W this file has the byte ordering of an AR32W machine
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* (e.g. 3b,maxi)
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* F_PATCH file contains "patch" list in optional header
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* F_NODF (minimal file only) no decision functions for
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* replaced functions
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*/
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#define COFF_F_RELFLG 0000001
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#define COFF_F_EXEC 0000002
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#define COFF_F_LNNO 0000004
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#define COFF_F_LSYMS 0000010
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#define COFF_F_MINMAL 0000020
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#define COFF_F_UPDATE 0000040
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#define COFF_F_SWABD 0000100
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#define COFF_F_AR16WR 0000200
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#define COFF_F_AR32WR 0000400
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#define COFF_F_AR32W 0001000
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#define COFF_F_PATCH 0002000
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#define COFF_F_NODF 0002000
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#define COFF_I386MAGIC 0x14c /* Linux's system */
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#if 0 /* Perhaps, someday, these formats may be used. */
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#define COFF_I386PTXMAGIC 0x154
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#define COFF_I386AIXMAGIC 0x175 /* IBM's AIX system */
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#define COFF_I386BADMAG(x) ((COFF_SHORT((x).f_magic) != COFF_I386MAGIC) \
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&& COFF_SHORT((x).f_magic) != COFF_I386PTXMAGIC \
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&& COFF_SHORT((x).f_magic) != COFF_I386AIXMAGIC)
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#else
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#define COFF_I386BADMAG(x) (COFF_SHORT((x).f_magic) != COFF_I386MAGIC)
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#endif
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#define COFF_FILHDR struct COFF_filehdr
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#define COFF_FILHSZ sizeof(COFF_FILHDR)
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/********************** AOUT "OPTIONAL HEADER" **********************/
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/* Linux COFF must have this "optional" header. Standard COFF has no entry
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location for the "entry" point. They normally would start with the first
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location of the .text section. This is not a good idea for linux. So,
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the use of this "optional" header is not optional. It is required.
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Do not be tempted to assume that the size of the optional header is
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a constant and simply index the next byte by the size of this structure.
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Use the 'f_opthdr' field in the main coff header for the size of the
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structure actually written to the file!!
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*/
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typedef struct
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{
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char magic[2]; /* type of file */
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char vstamp[2]; /* version stamp */
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char tsize[4]; /* text size in bytes, padded to FW bdry */
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char dsize[4]; /* initialized data " " */
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char bsize[4]; /* uninitialized data " " */
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char entry[4]; /* entry pt. */
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char text_start[4]; /* base of text used for this file */
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char data_start[4]; /* base of data used for this file */
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}
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COFF_AOUTHDR;
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#define COFF_AOUTSZ (sizeof(COFF_AOUTHDR))
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#define COFF_STMAGIC 0401
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#define COFF_OMAGIC 0404
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#define COFF_JMAGIC 0407 /* dirty text and data image, can't share */
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#define COFF_DMAGIC 0410 /* dirty text segment, data aligned */
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#define COFF_ZMAGIC 0413 /* The proper magic number for executables */
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#define COFF_SHMAGIC 0443 /* shared library header */
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/********************** SECTION HEADER **********************/
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struct COFF_scnhdr {
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char s_name[8]; /* section name */
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char s_paddr[4]; /* physical address, aliased s_nlib */
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char s_vaddr[4]; /* virtual address */
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char s_size[4]; /* section size */
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char s_scnptr[4]; /* file ptr to raw data for section */
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char s_relptr[4]; /* file ptr to relocation */
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char s_lnnoptr[4]; /* file ptr to line numbers */
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char s_nreloc[2]; /* number of relocation entries */
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char s_nlnno[2]; /* number of line number entries */
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char s_flags[4]; /* flags */
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};
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#define COFF_SCNHDR struct COFF_scnhdr
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#define COFF_SCNHSZ sizeof(COFF_SCNHDR)
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/*
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* names of "special" sections
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*/
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#define COFF_TEXT ".text"
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#define COFF_DATA ".data"
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#define COFF_BSS ".bss"
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#define COFF_COMMENT ".comment"
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#define COFF_LIB ".lib"
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#define COFF_SECT_TEXT 0 /* Section for instruction code */
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#define COFF_SECT_DATA 1 /* Section for initialized globals */
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#define COFF_SECT_BSS 2 /* Section for un-initialized globals */
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#define COFF_SECT_REQD 3 /* Minimum number of sections for good file */
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#define COFF_STYP_REG 0x00 /* regular segment */
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#define COFF_STYP_DSECT 0x01 /* dummy segment */
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#define COFF_STYP_NOLOAD 0x02 /* no-load segment */
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#define COFF_STYP_GROUP 0x04 /* group segment */
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#define COFF_STYP_PAD 0x08 /* .pad segment */
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#define COFF_STYP_COPY 0x10 /* copy section */
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#define COFF_STYP_TEXT 0x20 /* .text segment */
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#define COFF_STYP_DATA 0x40 /* .data segment */
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#define COFF_STYP_BSS 0x80 /* .bss segment */
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#define COFF_STYP_INFO 0x200 /* .comment section */
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#define COFF_STYP_OVER 0x400 /* overlay section */
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#define COFF_STYP_LIB 0x800 /* library section */
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/*
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* Shared libraries have the following section header in the data field for
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* each library.
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*/
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struct COFF_slib {
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char sl_entsz[4]; /* Size of this entry */
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char sl_pathndx[4]; /* size of the header field */
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};
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#define COFF_SLIBHD struct COFF_slib
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#define COFF_SLIBSZ sizeof(COFF_SLIBHD)
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/********************** LINE NUMBERS **********************/
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/* 1 line number entry for every "breakpointable" source line in a section.
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* Line numbers are grouped on a per function basis; first entry in a function
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* grouping will have l_lnno = 0 and in place of physical address will be the
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* symbol table index of the function name.
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*/
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struct COFF_lineno {
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union {
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char l_symndx[4]; /* function name symbol index, iff l_lnno == 0*/
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char l_paddr[4]; /* (physical) address of line number */
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} l_addr;
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char l_lnno[2]; /* line number */
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};
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#define COFF_LINENO struct COFF_lineno
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#define COFF_LINESZ 6
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/********************** SYMBOLS **********************/
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#define COFF_E_SYMNMLEN 8 /* # characters in a short symbol name */
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#define COFF_E_FILNMLEN 14 /* # characters in a file name */
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#define COFF_E_DIMNUM 4 /* # array dimensions in auxiliary entry */
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/*
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* All symbols and sections have the following definition
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*/
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struct COFF_syment
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{
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union {
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char e_name[E_SYMNMLEN]; /* Symbol name (first 8 characters) */
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struct {
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char e_zeroes[4]; /* Leading zeros */
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char e_offset[4]; /* Offset if this is a header section */
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} e;
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} e;
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char e_value[4]; /* Value (address) of the segment */
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char e_scnum[2]; /* Section number */
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char e_type[2]; /* Type of section */
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char e_sclass[1]; /* Loader class */
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char e_numaux[1]; /* Number of auxiliary entries which follow */
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};
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#define COFF_N_BTMASK (0xf) /* Mask for important class bits */
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#define COFF_N_TMASK (0x30) /* Mask for important type bits */
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#define COFF_N_BTSHFT (4) /* # bits to shift class field */
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#define COFF_N_TSHIFT (2) /* # bits to shift type field */
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/*
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* Auxiliary entries because the main table is too limiting.
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*/
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union COFF_auxent {
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/*
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* Debugger information
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*/
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struct {
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char x_tagndx[4]; /* str, un, or enum tag indx */
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union {
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struct {
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char x_lnno[2]; /* declaration line number */
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char x_size[2]; /* str/union/array size */
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} x_lnsz;
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char x_fsize[4]; /* size of function */
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} x_misc;
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union {
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struct { /* if ISFCN, tag, or .bb */
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char x_lnnoptr[4]; /* ptr to fcn line # */
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char x_endndx[4]; /* entry ndx past block end */
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} x_fcn;
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struct { /* if ISARY, up to 4 dimen. */
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char x_dimen[E_DIMNUM][2];
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} x_ary;
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} x_fcnary;
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char x_tvndx[2]; /* tv index */
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} x_sym;
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/*
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* Source file names (debugger information)
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*/
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union {
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char x_fname[E_FILNMLEN];
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struct {
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char x_zeroes[4];
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char x_offset[4];
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} x_n;
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} x_file;
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/*
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* Section information
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*/
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struct {
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char x_scnlen[4]; /* section length */
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char x_nreloc[2]; /* # relocation entries */
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char x_nlinno[2]; /* # line numbers */
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} x_scn;
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/*
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* Transfer vector (branch table)
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*/
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struct {
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char x_tvfill[4]; /* tv fill value */
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char x_tvlen[2]; /* length of .tv */
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char x_tvran[2][2]; /* tv range */
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} x_tv; /* info about .tv section (in auxent of symbol .tv)) */
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};
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#define COFF_SYMENT struct COFF_syment
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#define COFF_SYMESZ 18
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#define COFF_AUXENT union COFF_auxent
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#define COFF_AUXESZ 18
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#define COFF_ETEXT "etext"
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/********************** RELOCATION DIRECTIVES **********************/
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struct COFF_reloc {
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char r_vaddr[4]; /* Virtual address of item */
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char r_symndx[4]; /* Symbol index in the symtab */
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char r_type[2]; /* Relocation type */
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};
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#define COFF_RELOC struct COFF_reloc
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#define COFF_RELSZ 10
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#define COFF_DEF_DATA_SECTION_ALIGNMENT 4
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#define COFF_DEF_BSS_SECTION_ALIGNMENT 4
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#define COFF_DEF_TEXT_SECTION_ALIGNMENT 4
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/* For new sections we haven't heard of before */
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#define COFF_DEF_SECTION_ALIGNMENT 4
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