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  1. /* ECOFF support on MIPS machines.
  2.    coff/ecoff.h must be included before this file.
  3.    
  4.    Copyright 1999, 2004, 2010 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.