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      1 /* ECOFF support on MIPS machines.
      2    coff/ecoff.h must be included before this file.
      3 
      4    Copyright (C) 1999-2014 Free Software Foundation, Inc.
      5 
      6    This program is free software; you can redistribute it and/or modify
      7    it under the terms of the GNU General Public License as published by
      8    the Free Software Foundation; either version 3 of the License, or
      9    (at your option) any later version.
     10 
     11    This program is distributed in the hope that it will be useful,
     12    but WITHOUT ANY WARRANTY; without even the implied warranty of
     13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     14    GNU General Public License for more details.
     15 
     16    You should have received a copy of the GNU General Public License
     17    along with this program; if not, write to the Free Software
     18    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
     19    MA 02110-1301, USA.  */
     20 
     21 #define DO_NOT_DEFINE_AOUTHDR
     22 #define L_LNNO_SIZE 4
     23 #include "coff/external.h"
     24 
     25 /* Magic numbers are defined in coff/ecoff.h.  */
     26 #define MIPS_ECOFF_BADMAG(x) (((x).f_magic!=MIPS_MAGIC_1) && \
     27 			      ((x).f_magic!=MIPS_MAGIC_LITTLE) &&\
     28 			      ((x).f_magic!=MIPS_MAGIC_BIG) && \
     29 			      ((x).f_magic!=MIPS_MAGIC_LITTLE2) && \
     30 			      ((x).f_magic!=MIPS_MAGIC_BIG2) && \
     31 			      ((x).f_magic!=MIPS_MAGIC_LITTLE3) && \
     32 			      ((x).f_magic!=MIPS_MAGIC_BIG3))
     33 
     34 
     35 /********************** AOUT "OPTIONAL HEADER" **********************/
     36 
     37 typedef struct external_aouthdr
     38 {
     39   unsigned char magic[2];	/* type of file				*/
     40   unsigned char	vstamp[2];	/* version stamp			*/
     41   unsigned char	tsize[4];	/* text size in bytes, padded to FW bdry*/
     42   unsigned char	dsize[4];	/* initialized data "  "		*/
     43   unsigned char	bsize[4];	/* uninitialized data "   "		*/
     44   unsigned char	entry[4];	/* entry pt.				*/
     45   unsigned char text_start[4];	/* base of text used for this file */
     46   unsigned char data_start[4];	/* base of data used for this file */
     47   unsigned char bss_start[4];	/* base of bss used for this file */
     48   unsigned char gprmask[4];	/* ?? */
     49   unsigned char cprmask[4][4];	/* ?? */
     50   unsigned char gp_value[4];	/* value for gp register */
     51 } AOUTHDR;
     52 
     53 /* compute size of a header */
     54 
     55 #define AOUTSZ 56
     56 #define AOUTHDRSZ 56
     57 
     58 /********************** RELOCATION DIRECTIVES **********************/
     59 
     60 struct external_reloc
     61   {
     62     unsigned char r_vaddr[4];
     63     unsigned char r_bits[4];
     64   };
     65 
     66 #define RELOC struct external_reloc
     67 #define RELSZ 8
     68 
     69 /* MIPS ECOFF uses a packed 8 byte format for relocs.  These constants
     70    are used to unpack the r_bits field.  */
     71 
     72 #define RELOC_BITS0_SYMNDX_SH_LEFT_BIG		16
     73 #define RELOC_BITS0_SYMNDX_SH_LEFT_LITTLE	0
     74 
     75 #define RELOC_BITS1_SYMNDX_SH_LEFT_BIG		8
     76 #define RELOC_BITS1_SYMNDX_SH_LEFT_LITTLE	8
     77 
     78 #define RELOC_BITS2_SYMNDX_SH_LEFT_BIG		0
     79 #define RELOC_BITS2_SYMNDX_SH_LEFT_LITTLE	16
     80 
     81 /* Originally, ECOFF used four bits for the reloc type and had three
     82    reserved bits.  Irix 4 added another bit for the reloc type, which
     83    was easy because it was big endian and one of the spare bits became
     84    the new most significant bit.  To make this also work for little
     85    endian ECOFF, we need to wrap one of the reserved bits around to
     86    become the most significant bit of the reloc type.  */
     87 #define RELOC_BITS3_TYPE_BIG			0x3E
     88 #define RELOC_BITS3_TYPE_SH_BIG			1
     89 #define RELOC_BITS3_TYPE_LITTLE			0x78
     90 #define RELOC_BITS3_TYPE_SH_LITTLE		3
     91 #define RELOC_BITS3_TYPEHI_LITTLE		0x04
     92 #define RELOC_BITS3_TYPEHI_SH_LITTLE		2
     93 
     94 #define RELOC_BITS3_EXTERN_BIG			0x01
     95 #define RELOC_BITS3_EXTERN_LITTLE		0x80
     96 
     97 /* The r_type field in a reloc is one of the following values.  I
     98    don't know if any other values can appear.  These seem to be all
     99    that occur in the Ultrix 4.2 libraries.  */
    100 #define MIPS_R_IGNORE	0
    101 #define MIPS_R_REFHALF	1
    102 #define MIPS_R_REFWORD	2
    103 #define MIPS_R_JMPADDR	3
    104 #define MIPS_R_REFHI	4
    105 #define MIPS_R_REFLO	5
    106 #define MIPS_R_GPREL	6
    107 #define MIPS_R_LITERAL	7
    108 
    109 /* FIXME: This relocation is used (internally only) to represent branches
    110    when assembling.  It should never appear in output files, and
    111    be removed.  (It used to be used for embedded-PIC support.)  */
    112 #define MIPS_R_PCREL16	12
    113 
    114 /********************** STABS **********************/
    115 
    116 #define MIPS_IS_STAB ECOFF_IS_STAB
    117 #define MIPS_MARK_STAB ECOFF_MARK_STAB
    118 #define MIPS_UNMARK_STAB ECOFF_UNMARK_STAB
    119 
    120 /********************** SYMBOLIC INFORMATION **********************/
    121 
    122 /* Written by John Gilmore.  */
    123 
    124 /* ECOFF uses COFF-like section structures, but its own symbol format.
    125    This file defines the symbol format in fields whose size and alignment
    126    will not vary on different host systems.  */
    127 
    128 /* File header as a set of bytes */
    129 
    130 struct hdr_ext
    131 {
    132 	unsigned char 	h_magic[2];
    133 	unsigned char	h_vstamp[2];
    134 	unsigned char	h_ilineMax[4];
    135 	unsigned char	h_cbLine[4];
    136 	unsigned char	h_cbLineOffset[4];
    137 	unsigned char	h_idnMax[4];
    138 	unsigned char	h_cbDnOffset[4];
    139 	unsigned char	h_ipdMax[4];
    140 	unsigned char	h_cbPdOffset[4];
    141 	unsigned char	h_isymMax[4];
    142 	unsigned char	h_cbSymOffset[4];
    143 	unsigned char	h_ioptMax[4];
    144 	unsigned char	h_cbOptOffset[4];
    145 	unsigned char	h_iauxMax[4];
    146 	unsigned char	h_cbAuxOffset[4];
    147 	unsigned char	h_issMax[4];
    148 	unsigned char	h_cbSsOffset[4];
    149 	unsigned char	h_issExtMax[4];
    150 	unsigned char	h_cbSsExtOffset[4];
    151 	unsigned char	h_ifdMax[4];
    152 	unsigned char	h_cbFdOffset[4];
    153 	unsigned char	h_crfd[4];
    154 	unsigned char	h_cbRfdOffset[4];
    155 	unsigned char	h_iextMax[4];
    156 	unsigned char	h_cbExtOffset[4];
    157 };
    158 
    159 /* File descriptor external record */
    160 
    161 struct fdr_ext
    162 {
    163 	unsigned char	f_adr[4];
    164 	unsigned char	f_rss[4];
    165 	unsigned char	f_issBase[4];
    166 	unsigned char	f_cbSs[4];
    167 	unsigned char	f_isymBase[4];
    168 	unsigned char	f_csym[4];
    169 	unsigned char	f_ilineBase[4];
    170 	unsigned char	f_cline[4];
    171 	unsigned char	f_ioptBase[4];
    172 	unsigned char	f_copt[4];
    173 	unsigned char	f_ipdFirst[2];
    174 	unsigned char	f_cpd[2];
    175 	unsigned char	f_iauxBase[4];
    176 	unsigned char	f_caux[4];
    177 	unsigned char	f_rfdBase[4];
    178 	unsigned char	f_crfd[4];
    179 	unsigned char	f_bits1[1];
    180 	unsigned char	f_bits2[3];
    181 	unsigned char	f_cbLineOffset[4];
    182 	unsigned char	f_cbLine[4];
    183 };
    184 
    185 #define	FDR_BITS1_LANG_BIG		0xF8
    186 #define	FDR_BITS1_LANG_SH_BIG		3
    187 #define	FDR_BITS1_LANG_LITTLE		0x1F
    188 #define	FDR_BITS1_LANG_SH_LITTLE	0
    189 
    190 #define	FDR_BITS1_FMERGE_BIG		0x04
    191 #define	FDR_BITS1_FMERGE_LITTLE		0x20
    192 
    193 #define	FDR_BITS1_FREADIN_BIG		0x02
    194 #define	FDR_BITS1_FREADIN_LITTLE	0x40
    195 
    196 #define	FDR_BITS1_FBIGENDIAN_BIG	0x01
    197 #define	FDR_BITS1_FBIGENDIAN_LITTLE	0x80
    198 
    199 #define	FDR_BITS2_GLEVEL_BIG		0xC0
    200 #define	FDR_BITS2_GLEVEL_SH_BIG		6
    201 #define	FDR_BITS2_GLEVEL_LITTLE		0x03
    202 #define	FDR_BITS2_GLEVEL_SH_LITTLE	0
    203 
    204 /* We ignore the `reserved' field in bits2. */
    205 
    206 /* Procedure descriptor external record */
    207 
    208 struct pdr_ext
    209 {
    210 	unsigned char	p_adr[4];
    211 	unsigned char	p_isym[4];
    212 	unsigned char	p_iline[4];
    213 	unsigned char	p_regmask[4];
    214 	unsigned char	p_regoffset[4];
    215 	unsigned char	p_iopt[4];
    216 	unsigned char	p_fregmask[4];
    217 	unsigned char	p_fregoffset[4];
    218 	unsigned char	p_frameoffset[4];
    219 	unsigned char	p_framereg[2];
    220 	unsigned char	p_pcreg[2];
    221 	unsigned char	p_lnLow[4];
    222 	unsigned char	p_lnHigh[4];
    223 	unsigned char	p_cbLineOffset[4];
    224 };
    225 
    226 /* Runtime procedure table */
    227 
    228 struct rpdr_ext
    229 {
    230 	unsigned char	p_adr[4];
    231 	unsigned char	p_regmask[4];
    232 	unsigned char	p_regoffset[4];
    233 	unsigned char	p_fregmask[4];
    234 	unsigned char	p_fregoffset[4];
    235 	unsigned char	p_frameoffset[4];
    236 	unsigned char	p_framereg[2];
    237 	unsigned char	p_pcreg[2];
    238 	unsigned char	p_irpss[4];
    239 	unsigned char	p_reserved[4];
    240 	unsigned char	p_exception_info[4];
    241 };
    242 
    243 /* Line numbers */
    244 
    245 struct line_ext
    246 {
    247 	unsigned char	l_line[4];
    248 };
    249 
    250 /* Symbol external record */
    251 
    252 struct sym_ext
    253 {
    254 	unsigned char	s_iss[4];
    255 	unsigned char	s_value[4];
    256 	unsigned char	s_bits1[1];
    257 	unsigned char	s_bits2[1];
    258 	unsigned char	s_bits3[1];
    259 	unsigned char	s_bits4[1];
    260 };
    261 
    262 #define	SYM_BITS1_ST_BIG		0xFC
    263 #define	SYM_BITS1_ST_SH_BIG		2
    264 #define	SYM_BITS1_ST_LITTLE		0x3F
    265 #define	SYM_BITS1_ST_SH_LITTLE		0
    266 
    267 #define	SYM_BITS1_SC_BIG		0x03
    268 #define	SYM_BITS1_SC_SH_LEFT_BIG	3
    269 #define	SYM_BITS1_SC_LITTLE		0xC0
    270 #define	SYM_BITS1_SC_SH_LITTLE		6
    271 
    272 #define	SYM_BITS2_SC_BIG		0xE0
    273 #define	SYM_BITS2_SC_SH_BIG		5
    274 #define	SYM_BITS2_SC_LITTLE		0x07
    275 #define	SYM_BITS2_SC_SH_LEFT_LITTLE	2
    276 
    277 #define	SYM_BITS2_RESERVED_BIG		0x10
    278 #define	SYM_BITS2_RESERVED_LITTLE	0x08
    279 
    280 #define	SYM_BITS2_INDEX_BIG		0x0F
    281 #define	SYM_BITS2_INDEX_SH_LEFT_BIG	16
    282 #define	SYM_BITS2_INDEX_LITTLE		0xF0
    283 #define	SYM_BITS2_INDEX_SH_LITTLE	4
    284 
    285 #define	SYM_BITS3_INDEX_SH_LEFT_BIG	8
    286 #define	SYM_BITS3_INDEX_SH_LEFT_LITTLE	4
    287 
    288 #define	SYM_BITS4_INDEX_SH_LEFT_BIG	0
    289 #define	SYM_BITS4_INDEX_SH_LEFT_LITTLE	12
    290 
    291 /* External symbol external record */
    292 
    293 struct ext_ext
    294 {
    295 	unsigned char	es_bits1[1];
    296 	unsigned char	es_bits2[1];
    297 	unsigned char	es_ifd[2];
    298 	struct	sym_ext es_asym;
    299 };
    300 
    301 #define	EXT_BITS1_JMPTBL_BIG		0x80
    302 #define	EXT_BITS1_JMPTBL_LITTLE		0x01
    303 
    304 #define	EXT_BITS1_COBOL_MAIN_BIG	0x40
    305 #define	EXT_BITS1_COBOL_MAIN_LITTLE	0x02
    306 
    307 #define	EXT_BITS1_WEAKEXT_BIG		0x20
    308 #define	EXT_BITS1_WEAKEXT_LITTLE	0x04
    309 
    310 /* Dense numbers external record */
    311 
    312 struct dnr_ext
    313 {
    314 	unsigned char	d_rfd[4];
    315 	unsigned char	d_index[4];
    316 };
    317 
    318 /* Relative file descriptor */
    319 
    320 struct rfd_ext
    321 {
    322   unsigned char	rfd[4];
    323 };
    324 
    325 /* Optimizer symbol external record */
    326 
    327 struct opt_ext
    328 {
    329   unsigned char o_bits1[1];
    330   unsigned char o_bits2[1];
    331   unsigned char o_bits3[1];
    332   unsigned char o_bits4[1];
    333   struct rndx_ext o_rndx;
    334   unsigned char o_offset[4];
    335 };
    336 
    337 #define OPT_BITS2_VALUE_SH_LEFT_BIG	16
    338 #define OPT_BITS2_VALUE_SH_LEFT_LITTLE	0
    339 
    340 #define OPT_BITS3_VALUE_SH_LEFT_BIG	8
    341 #define OPT_BITS3_VALUE_SH_LEFT_LITTLE	8
    342 
    343 #define OPT_BITS4_VALUE_SH_LEFT_BIG	0
    344 #define OPT_BITS4_VALUE_SH_LEFT_LITTLE	16
    345