include/coff/a29k.h

   1 /* COFF spec for AMD 290*0
   2
   3    Copyright 2001 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software
  17    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18
  19    Contributed by David Wood @ New York University. */
  20
  21 #ifndef AMD
  22 # define AMD
  23 #endif
  24
  25 #define L_LNNO_SIZE 2
  26 #include "coff/external.h"
  27
  28 /*
  29 ** Magic numbers for Am29000
  30 **      (AT&T will assign the "real" magic number)
  31 */
  32
  33 #define SIPFBOMAGIC     0572    /* Am29000 (Byte 0 is MSB) */
  34 #define SIPRBOMAGIC     0573    /* Am29000 (Byte 0 is LSB) */
  35
  36 #define A29K_MAGIC_BIG          SIPFBOMAGIC
  37 #define A29K_MAGIC_LITTLE       SIPRBOMAGIC
  38 #define A29KBADMAG(x)   ( ((x).f_magic != A29K_MAGIC_BIG) && \
  39                           ((x).f_magic != A29K_MAGIC_LITTLE))
  40
  41 #define OMAGIC A29K_MAGIC_BIG
  42 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
  43
  44 /*
  45 ** File header flags currently known to us.
  46 **
  47 ** Am29000 will use the F_AR32WR and F_AR32W flags to indicate
  48 ** the byte ordering in the file.
  49 */
  50
  51 /*--------------------------------------------------------------*/
  52
  53
  54 /* aouthdr magic numbers */
  55 #define NMAGIC          0410    /* separate i/d executable */
  56 #define SHMAGIC 0406            /* NYU/Ultra3 shared data executable
  57                                    (writable text) */
  58 #undef  _ETEXT
  59 #define _ETEXT          "_etext"
  60
  61 /*--------------------------------------------------------------*/
  62
  63
  64 /* More names of "special" sections.  */
  65 #define _LIT    ".lit"
  66
  67 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
  68
  69 /*
  70 ** Section types - with additional section type for global
  71 ** registers which will be relocatable for the Am29000.
  72 **
  73 ** In instances where it is necessary for a linker to produce an
  74 ** output file which contains text or data not based at virtual
  75 ** address 0, e.g. for a ROM, then the linker should accept
  76 ** address base information as command input and use PAD sections
  77 ** to skip over unused addresses.
  78 */
  79
  80 #define STYP_BSSREG     0x1200  /* Global register area (like STYP_INFO) */
  81 #define STYP_ENVIR      0x2200  /* Environment (like STYP_INFO) */
  82 #define STYP_ABS        0x4000  /* Absolute (allocated, not reloc, loaded) */
  83
  84 /*--------------------------------------------------------------*/
  85
  86 /*
  87 ** Relocation information declaration and related definitions
  88 */
  89
  90 struct external_reloc
  91 {
  92   char r_vaddr[4];      /* (virtual) address of reference */
  93   char r_symndx[4];     /* index into symbol table */
  94   char r_type[2];       /* relocation type */
  95 };
  96
  97 #define RELOC           struct external_reloc
  98 #define RELSZ           10              /* sizeof (RELOC) */
  99
 100 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
 101
 102 /*
 103 ** Relocation types for the Am29000
 104 */
 105
 106 #define R_ABS           0       /* reference is absolute */
 107
 108 #define R_IREL          030     /* instruction relative (jmp/call) */
 109 #define R_IABS          031     /* instruction absolute (jmp/call) */
 110 #define R_ILOHALF       032     /* instruction low half  (const)  */
 111 #define R_IHIHALF       033     /* instruction high half (consth) part 1 */
 112 #define R_IHCONST       034     /* instruction high half (consth) part 2 */
 113                                 /* constant offset of R_IHIHALF relocation */
 114 #define R_BYTE          035     /* relocatable byte value */
 115 #define R_HWORD         036     /* relocatable halfword value */
 116 #define R_WORD          037     /* relocatable word value */
 117
 118 #define R_IGLBLRC       040     /* instruction global register RC */
 119 #define R_IGLBLRA       041     /* instruction global register RA */
 120 #define R_IGLBLRB       042     /* instruction global register RB */
 121
 122 /*
 123 NOTE:
 124 All the "I" forms refer to 29000 instruction formats.  The linker is
 125 expected to know how the numeric information is split and/or aligned
 126 within the instruction word(s).  R_BYTE works for instructions, too.
 127
 128 If the parameter to a CONSTH instruction is a relocatable type, two
 129 relocation records are written.  The first has an r_type of R_IHIHALF
 130 (33 octal) and a normal r_vaddr and r_symndx.  The second relocation
 131 record has an r_type of R_IHCONST (34 octal), a normal r_vaddr (which
 132 is redundant), and an r_symndx containing the 32-bit constant offset
 133 to the relocation instead of the actual symbol table index.  This
 134 second record is always written, even if the constant offset is zero.
 135 The constant fields of the instruction are set to zero.
 136 */
 137
 138 /*--------------------------------------------------------------*/
 139
 140 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
 141
 142 /*
 143 ** Storage class definitions - new classes for global registers.
 144 */
 145
 146 #define C_GLBLREG       19              /* global register */
 147 #define C_EXTREG        20              /* external global register */
 148 #define C_DEFREG        21              /* ext. def. of global register */