include/coff/mips.h

   1 /* Rudimentary ECOFF support on MIPS machines.
   2    This lacks symbol information, normally provided on MIPS Unix systems
   3    in the files <sym.h> and <symconst.h>.  */
   4
   5 /********************** FILE HEADER **********************/
   6
   7 struct external_filehdr {
   8   unsigned char f_magic[2];     /* magic number                 */
   9   unsigned char f_nscns[2];     /* number of sections           */
  10   unsigned char f_timdat[4];    /* time & date stamp            */
  11   unsigned char f_symptr[4];    /* file pointer to symtab       */
  12   unsigned char f_nsyms[4];     /* number of symtab entries     */
  13   unsigned char f_opthdr[2];    /* sizeof(optional hdr)         */
  14   unsigned char f_flags[2];     /* flags                        */
  15 };
  16
  17
  18 /* Mips magics */
  19 #define MIPS_MAGIC_1 0x0180
  20 #define MIPS_MAGIC_2 0x0162
  21 #define MIPS_MAGIC_3 0x0160
  22
  23 #define ECOFFBADMAG(x) (((x).f_magic!=MIPS_MAGIC_1) && \
  24                         ((x).f_magic!=MIPS_MAGIC_2) &&\
  25                         ((x).f_magic!=MIPS_MAGIC_3))
  26
  27
  28 #define FILHDR  struct external_filehdr
  29 #define FILHSZ  20
  30
  31 /********************** AOUT "OPTIONAL HEADER" **********************/
  32
  33
  34 typedef struct external_aouthdr
  35 {
  36   unsigned char magic[2];       /* type of file                         */
  37   unsigned char vstamp[2];      /* version stamp                        */
  38   unsigned char tsize[4];       /* text size in bytes, padded to FW bdry*/
  39   unsigned char dsize[4];       /* initialized data "  "                */
  40   unsigned char bsize[4];       /* uninitialized data "   "             */
  41   unsigned char entry[4];       /* entry pt.                            */
  42   unsigned char text_start[4];  /* base of text used for this file */
  43   unsigned char data_start[4];  /* base of data used for this file */
  44 } AOUTHDR;
  45
  46 /* compute size of a header */
  47
  48 #define AOUTSZ (sizeof(AOUTHDR))
  49
  50 #define ZMAGIC          0413    /* demand load format, eg normal ld output */
  51
  52 /********************** SECTION HEADER **********************/
  53
  54 struct external_scnhdr {
  55   unsigned char s_name[8];      /* section name                 */
  56   unsigned char s_paddr[4];     /* physical address, aliased s_nlib */
  57   unsigned char s_vaddr[4];     /* virtual address              */
  58   unsigned char s_size[4];      /* section size                 */
  59   unsigned char s_scnptr[4];    /* file ptr to raw data for section */
  60   unsigned char s_relptr[4];    /* file ptr to relocation       */
  61   unsigned char s_lnnoptr[4];   /* file ptr to line numbers     */
  62   unsigned char s_nreloc[2];    /* number of relocation entries */
  63   unsigned char s_nlnno[2];     /* number of line number entries*/
  64   unsigned char s_flags[4];     /* flags                        */
  65 };
  66
  67 #define SCNHDR  struct external_scnhdr
  68 #define SCNHSZ  sizeof(SCNHDR)
  69
  70 /*
  71  * names of "special" sections
  72  */
  73 #define _TEXT   ".text"
  74 #define _DATA   ".data"
  75 #define _BSS    ".bss"
  76 #define _RDATA  ".rdata"
  77 #define _SDATA  ".sdata"
  78 #define _SBSS   ".sbss"
  79 #define _LIT4   ".lit4"
  80 #define _LIT8   ".lit8"
  81 #define _LIB    ".lib"
  82
  83 #define DEFAULT_DATA_SECTION_ALIGNMENT 4
  84 #define DEFAULT_BSS_SECTION_ALIGNMENT 4
  85 #define DEFAULT_TEXT_SECTION_ALIGNMENT 16
  86 /* For new sections we havn't heard of before */
  87 #define DEFAULT_SECTION_ALIGNMENT 4
  88
  89 /* MIPS ECOFF uses some additional section types.  */
  90 #define STYP_RDATA 0x100
  91 #define STYP_SDATA 0x200
  92 #define STYP_SBSS 0x400
  93 #define STYP_LIT8 0x8000000
  94 #define STYP_LIT4 0x10000000
  95
  96 /* I don't know when this is used.  */
  97 #define STYP_OTHER_LOAD 0x80000000
  98
  99 /********************** RELOCATION DIRECTIVES **********************/
 100
 101 struct external_reloc {
 102   unsigned char r_vaddr[4];
 103   unsigned char r_bits[4];
 104 };
 105
 106 /* MIPS ECOFF uses a packed 8 byte format for relocs.  These constants
 107    are used to unpack the r_bits field.  FIXME: Check these on a big
 108    endian machine.  */
 109
 110 #define RELOC_BITS0_SYMNDX_SH_LEFT_BIG          16
 111 #define RELOC_BITS0_SYMNDX_SH_LEFT_LITTLE       0
 112
 113 #define RELOC_BITS1_SYMNDX_SH_LEFT_BIG          8
 114 #define RELOC_BITS1_SYMNDX_SH_LEFT_LITTLE       8
 115
 116 #define RELOC_BITS2_SYMNDX_SH_LEFT_BIG          0
 117 #define RELOC_BITS2_SYMNDX_SH_LEFT_LITTLE       16
 118
 119 #define RELOC_BITS3_TYPE_BIG                    0x3C
 120 #define RELOC_BITS3_TYPE_SH_BIG                 2
 121 #define RELOC_BITS3_TYPE_LITTLE                 0x78
 122 #define RELOC_BITS3_TYPE_SH_LITTLE              3
 123
 124 #define RELOC_BITS3_EXTERN_BIG                  0x01
 125 #define RELOC_BITS3_EXTERN_LITTLE               0x80
 126
 127 /* We store the extern field in the r_offset field of a struct
 128    internal_reloc.  FIXME: Do this more sensibly.  */
 129 #define r_extern r_offset
 130
 131 /* Relevent values for r_type and ecoff.  Would someone please document them */
 132
 133 #define RELOC struct external_reloc
 134 #define RELSZ 8
 135
 136 /* gcc uses mips-tfile to output type information in special stabs
 137    entries.  These must match the corresponding definition in
 138    gcc/config/mips.h.  At some point, these should probably go into a
 139    shared include file, but currently gcc and gdb do not share any
 140    directories. */
 141 #define CODE_MASK 0x8F300
 142 #define MIPS_IS_STAB(sym) (((sym)->index & 0xFFF00) == CODE_MASK)
 143 #define MIPS_MARK_STAB(code) ((code)+CODE_MASK)
 144 #define MIPS_UNMARK_STAB(code) ((code)-CODE_MASK)
 145 #define STABS_SYMBOL "@stabs"