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