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288 lines
7.7 KiB
C
288 lines
7.7 KiB
C
/* ARM COFF support for BFD.
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Copyright (C) 1998, 1999 Free Software Foundation, Inc.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#define COFFARM 1
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/********************** FILE HEADER **********************/
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struct external_filehdr
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{
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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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/* Bits for f_flags:
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* F_RELFLG relocation info stripped from file
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* F_EXEC file is executable (no unresolved external 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_INTERWORK file supports switching between ARM and Thumb instruction sets
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* F_INTERWORK_SET the F_INTERWORK bit is valid
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* F_APCS_FLOAT code passes float arguments in float registers
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* F_PIC code is reentrant/position-independent
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* F_AR32WR file has byte ordering of an AR32WR machine (e.g. vax)
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* F_APCS_26 file uses 26 bit ARM Procedure Calling Standard
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* F_APCS_SET the F_APCS_26, F_APCS_FLOAT and F_PIC bits have been initialised
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* F_SOFTFLOAT code does not use floating point instructions
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*/
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#define F_RELFLG (0x0001)
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#define F_EXEC (0x0002)
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#define F_LNNO (0x0004)
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#define F_LSYMS (0x0008)
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#define F_INTERWORK (0x0010)
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#define F_INTERWORK_SET (0x0020)
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#define F_APCS_FLOAT (0x0040)
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#undef F_AR16WR
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#define F_PIC (0x0080)
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#define F_AR32WR (0x0100)
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#define F_APCS_26 (0x0400)
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#define F_APCS_SET (0x0800)
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#define F_SOFTFLOAT (0x2000)
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/* Bits stored in flags field of the internal_f structure */
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#define F_INTERWORK (0x0010)
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#define F_APCS_FLOAT (0x0040)
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#define F_PIC (0x0080)
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#define F_APCS26 (0x1000)
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#define F_ARM_ARCHITECTURE_MASK (0x4000+0x0800+0x0400)
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#define F_ARM_2 (0x0400)
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#define F_ARM_2a (0x0800)
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#define F_ARM_3 (0x0c00)
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#define F_ARM_3M (0x4000)
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#define F_ARM_4 (0x4400)
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#define F_ARM_4T (0x4800)
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#define F_ARM_5 (0x4c00)
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/*
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* ARMMAGIC ought to encoded the procesor type,
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* but it is too late to change it now, instead
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* the flags field of the internal_f structure
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* is used as shown above.
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*
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* XXX - NC 5/6/97
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*/
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#define ARMMAGIC 0xa00 /* I just made this up */
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#define ARMBADMAG(x) (((x).f_magic != ARMMAGIC))
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#define FILHDR struct external_filehdr
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#define FILHSZ 20
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/********************** AOUT "OPTIONAL HEADER" **********************/
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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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AOUTHDR;
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#define AOUTSZ 28
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#define AOUTHDRSZ 28
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#define OMAGIC 0404 /* object files, eg as output */
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#define ZMAGIC 0413 /* demand load format, eg normal ld output */
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#define STMAGIC 0401 /* target shlib */
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#define SHMAGIC 0443 /* host shlib */
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/* define some NT default values */
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/* #define NT_IMAGE_BASE 0x400000 moved to internal.h */
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#define NT_SECTION_ALIGNMENT 0x1000
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#define NT_FILE_ALIGNMENT 0x200
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#define NT_DEF_RESERVE 0x100000
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#define NT_DEF_COMMIT 0x1000
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/********************** SECTION HEADER **********************/
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struct external_scnhdr
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{
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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 SCNHDR struct external_scnhdr
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#define SCNHSZ 40
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/*
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* names of "special" sections
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*/
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#define _TEXT ".text"
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#define _DATA ".data"
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#define _BSS ".bss"
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#define _COMMENT ".comment"
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#define _LIB ".lib"
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/* We use the .rdata section to hold read only data. */
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#define _LIT ".rdata"
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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 external_lineno
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{
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union
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{
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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 LINENO struct external_lineno
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#define LINESZ 6
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/********************** SYMBOLS **********************/
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#define E_SYMNMLEN 8 /* # characters in a symbol name */
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#define E_FILNMLEN 14 /* # characters in a file name */
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#define E_DIMNUM 4 /* # array dimensions in auxiliary entry */
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struct external_syment
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{
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union
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{
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char e_name[E_SYMNMLEN];
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struct
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{
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char e_zeroes[4];
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char e_offset[4];
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} e;
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} e;
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char e_value[4];
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char e_scnum[2];
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char e_type[2];
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char e_sclass[1];
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char e_numaux[1];
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};
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#define N_BTMASK (0xf)
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#define N_TMASK (0x30)
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#define N_BTSHFT (4)
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#define N_TSHIFT (2)
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union external_auxent
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{
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struct
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{
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char x_tagndx[4]; /* str, un, or enum tag indx */
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union
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{
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struct
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{
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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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{
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struct /* if ISFCN, tag, or .bb */
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{
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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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{
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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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union
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{
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char x_fname[E_FILNMLEN];
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struct
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{
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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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struct
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{
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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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char x_checksum[4]; /* section COMDAT checksum */
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char x_associated[2]; /* COMDAT associated section index */
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char x_comdat[1]; /* COMDAT selection number */
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} x_scn;
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struct
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{
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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 SYMENT struct external_syment
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#define SYMESZ 18
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#define AUXENT union external_auxent
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#define AUXESZ 18
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#define _ETEXT "etext"
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/********************** RELOCATION DIRECTIVES **********************/
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struct external_reloc
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{
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char r_vaddr[4];
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char r_symndx[4];
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char r_type[2];
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char r_offset[4];
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};
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#define RELOC struct external_reloc
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#define RELSZ 14
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