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      1 /* IBM RS/6000 "XCOFF64" file definitions for BFD.
      2    Copyright (C) 2000-2014 Free Software Foundation, Inc.
      3 
      4    This program is free software; you can redistribute it and/or modify
      5    it under the terms of the GNU General Public License as published by
      6    the Free Software Foundation; either version 3 of the License, or
      7    (at your option) any later version.
      8 
      9    This program is distributed in the hope that it will be useful,
     10    but WITHOUT ANY WARRANTY; without even the implied warranty of
     11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     12    GNU General Public License for more details.
     13 
     14    You should have received a copy of the GNU General Public License
     15    along with this program; if not, write to the Free Software
     16    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
     17    MA 02110-1301, USA.  */
     18 
     19 /********************** FILE HEADER **********************/
     20 
     21 struct external_filehdr
     22 {
     23   char f_magic[2];	/* magic number			*/
     24   char f_nscns[2];	/* number of sections		*/
     25   char f_timdat[4];	/* time & date stamp		*/
     26   char f_symptr[8];	/* file pointer to symtab 	*/
     27   char f_opthdr[2];	/* sizeof(optional hdr)		*/
     28   char f_flags[2];	/* flags			*/
     29   char f_nsyms[4];	/* number of symtab entries	*/
     30 };
     31 
     32 /* IBM RS/6000.  */
     33 #define U803XTOCMAGIC 0757	/* Aix 4.3 64-bit XCOFF */
     34 #define	U64_TOCMAGIC  0767	/* AIX 5+ 64-bit XCOFF */
     35 #define BADMAG(x) ((x).f_magic != U803XTOCMAGIC && (x).f_magic != U64_TOCMAGIC)
     36 
     37 #define	FILHDR	struct external_filehdr
     38 #define	FILHSZ	24
     39 
     40 /********************** AOUT "OPTIONAL HEADER" **********************/
     41 
     42 typedef struct
     43 {
     44   unsigned char	magic[2];		/* type of file			*/
     45   unsigned char	vstamp[2];		/* version stamp		*/
     46   unsigned char	o_debugger[4];		/* reserved 			*/
     47   unsigned char	text_start[8];		/* base of text used for this file */
     48   unsigned char	data_start[8];		/* base of data used for this file */
     49   unsigned char	o_toc[8];		/* address of TOC */
     50   unsigned char	o_snentry[2];		/* section number of entry point */
     51   unsigned char	o_sntext[2];		/* section number of .text section */
     52   unsigned char	o_sndata[2];		/* section number of .data section */
     53   unsigned char	o_sntoc[2];		/* section number of TOC */
     54   unsigned char	o_snloader[2];		/* section number of .loader section */
     55   unsigned char	o_snbss[2];		/* section number of .bss section */
     56   unsigned char	o_algntext[2];		/* .text alignment */
     57   unsigned char	o_algndata[2];		/* .data alignment */
     58   unsigned char	o_modtype[2];		/* module type (??) */
     59   unsigned char o_cputype[2];		/* cpu type */
     60   unsigned char	o_resv2[4];		/* reserved 			*/
     61   unsigned char	tsize[8];		/* text size bytes, padded to FW bdry */
     62   unsigned char	dsize[8];		/* initialized data "  "	*/
     63   unsigned char	bsize[8];		/* uninitialized data "   "	*/
     64   unsigned char	entry[8];		/* entry pt.			*/
     65   unsigned char	o_maxstack[8];		/* max stack size (??) 		*/
     66   unsigned char o_maxdata[8];		/* max data size (??) 		*/
     67   unsigned char	o_resv3[16];		/* reserved 			*/
     68 }
     69 AOUTHDR;
     70 
     71 #define AOUTSZ 120
     72 #define SMALL_AOUTSZ (0)
     73 #define AOUTHDRSZ 72
     74 
     75 /********************** SECTION HEADER **********************/
     76 
     77 struct external_scnhdr
     78 {
     79   char	s_name[8];	/* section name			*/
     80   char	s_paddr[8];	/* physical address, aliased s_nlib */
     81   char	s_vaddr[8];	/* virtual address		*/
     82   char	s_size[8];	/* section size			*/
     83   char	s_scnptr[8];	/* file ptr to raw data for section */
     84   char	s_relptr[8];	/* file ptr to relocation	*/
     85   char	s_lnnoptr[8];	/* file ptr to line numbers	*/
     86   char	s_nreloc[4];	/* number of relocation entries	*/
     87   char	s_nlnno[4];	/* number of line number entries*/
     88   char	s_flags[4];	/* flags			*/
     89   char  s_pad[4];	/* padding */
     90 };
     91 
     92 #define	SCNHDR	struct external_scnhdr
     93 
     94 #define	SCNHSZ	72
     95 
     96 /********************** LINE NUMBERS **********************/
     97 
     98 /* 1 line number entry for every "breakpointable" source line in a section.
     99    Line numbers are grouped on a per function basis; first entry in a function
    100    grouping will have l_lnno = 0 and in place of physical address will be the
    101    symbol table index of the function name.  */
    102 
    103 struct external_lineno
    104 {
    105   union
    106   {
    107     char l_symndx[4];	/* function name symbol index, iff l_lnno == 0*/
    108     char l_paddr[8];	/* (physical) address of line number	*/
    109   } l_addr;
    110 
    111   char l_lnno[4];	/* line number		*/
    112 };
    113 
    114 #define	LINENO	struct external_lineno
    115 
    116 #define	LINESZ	12
    117 
    118 /********************** SYMBOLS **********************/
    119 
    120 #define E_SYMNMLEN	8	/* # characters in a symbol name	*/
    121 #define E_FILNMLEN	14	/* # characters in a file name		*/
    122 #define E_DIMNUM	4	/* # array dimensions in auxiliary entry */
    123 
    124 struct external_syment
    125 {
    126   char e_value[8];
    127   char e_offset[4];
    128   char e_scnum[2];
    129   char e_type[2];
    130   char e_sclass[1];
    131   char e_numaux[1];
    132 };
    133 
    134 #define N_BTMASK	(017)
    135 #define N_TMASK		(060)
    136 #define N_BTSHFT	(4)
    137 #define N_TSHIFT	(2)
    138 
    139 union external_auxent
    140 {
    141     struct {
    142     	union {
    143 	    struct {
    144 		char x_lnno[4]; 	/* declaration line number */
    145 		char x_size[2]; 	/* str/union/array size */
    146 	    } x_lnsz;
    147 	    struct {
    148 		char x_lnnoptr[8];/* ptr to fcn line */
    149 		char x_fsize[4];	 /* size of function */
    150 		char x_endndx[4];	 /* entry ndx past block end */
    151 	    } x_fcn;
    152  	} x_fcnary;
    153     } x_sym;
    154 
    155     struct {
    156         union {
    157             char x_fname[E_FILNMLEN];
    158             struct {
    159 	        char x_zeroes[4];
    160                 char x_offset[4];
    161 	        char x_pad[6];
    162             } x_n;
    163         } x_n;
    164         unsigned char x_ftype[1];
    165         unsigned char x_resv[2];
    166     } x_file;
    167 
    168     struct {
    169 	char x_exptr[8];
    170 	char x_fsize[4];
    171 	char x_endndx[4];
    172 	char x_pad[1];
    173     } x_except;
    174 
    175     struct {
    176 	    unsigned char x_scnlen_lo[4];
    177 	    unsigned char x_parmhash[4];
    178 	    unsigned char x_snhash[2];
    179 	    unsigned char x_smtyp[1];
    180 	    unsigned char x_smclas[1];
    181 	    unsigned char x_scnlen_hi[4];
    182 	    unsigned char x_pad[1];
    183     } x_csect;
    184 
    185     struct {
    186 	char x_pad[17];
    187 	char x_auxtype[1];
    188     } x_auxtype;
    189 };
    190 
    191 #define	SYMENT	struct external_syment
    192 #define	SYMESZ	18
    193 #define	AUXENT	union external_auxent
    194 #define	AUXESZ	18
    195 #define DBXMASK 0x80		/* for dbx storage mask */
    196 #define SYMNAME_IN_DEBUG(symptr) ((symptr)->n_sclass & DBXMASK)
    197 
    198 /* Values for auxtype field in XCOFF64, taken from AIX 4.3 sym.h.  */
    199 #define _AUX_EXCEPT     255
    200 #define _AUX_FCN        254
    201 #define _AUX_SYM        253
    202 #define _AUX_FILE       252
    203 #define _AUX_CSECT      251
    204 
    205 /********************** RELOCATION DIRECTIVES **********************/
    206 
    207 struct external_reloc
    208 {
    209   char r_vaddr[8];
    210   char r_symndx[4];
    211   char r_size[1];
    212   char r_type[1];
    213 };
    214 
    215 #define RELOC struct external_reloc
    216 #define RELSZ 14
    217 
    218 #define DEFAULT_DATA_SECTION_ALIGNMENT 4
    219 #define DEFAULT_BSS_SECTION_ALIGNMENT 4
    220 #define DEFAULT_TEXT_SECTION_ALIGNMENT 4
    221 /* For new sections we havn't heard of before */
    222 #define DEFAULT_SECTION_ALIGNMENT 4
    223 
    224 /* The ldhdr structure.  This appears at the start of the .loader
    225    section.  */
    226 
    227 struct external_ldhdr
    228 {
    229   bfd_byte l_version[4];
    230   bfd_byte l_nsyms[4];
    231   bfd_byte l_nreloc[4];
    232   bfd_byte l_istlen[4];
    233   bfd_byte l_nimpid[4];
    234   bfd_byte l_stlen[4];
    235   bfd_byte l_impoff[8];
    236   bfd_byte l_stoff[8];
    237   bfd_byte l_symoff[8];
    238   bfd_byte l_rldoff[8];
    239 };
    240 #define LDHDRSZ (56)
    241 
    242 struct external_ldsym
    243 {
    244   bfd_byte l_value[8];
    245   bfd_byte l_offset[4];
    246   bfd_byte l_scnum[2];
    247   bfd_byte l_smtype[1];
    248   bfd_byte l_smclas[1];
    249   bfd_byte l_ifile[4];
    250   bfd_byte l_parm[4];
    251 };
    252 
    253 #define LDSYMSZ (24)
    254 
    255 struct external_ldrel
    256 {
    257   bfd_byte l_vaddr[8];
    258   bfd_byte l_rtype[2];
    259   bfd_byte l_rsecnm[2];
    260   bfd_byte l_symndx[4];
    261 };
    262 
    263 #define LDRELSZ (16)
    264 
    265 struct external_exceptab
    266 {
    267   union {
    268     bfd_byte e_symndx[4];
    269     bfd_byte e_paddr[8];
    270   } e_addr;
    271   bfd_byte e_lang[1];
    272   bfd_byte e_reason[1];
    273 };
    274 
    275 #define EXCEPTSZ (10)
    276