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