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
  51 /********************** SECTION HEADER **********************/
  52
  53 struct external_scnhdr {
  54   unsigned char s_name[8];      /* section name                 */
  55   unsigned char s_paddr[4];     /* physical address, aliased s_nlib */
  56   unsigned char s_vaddr[4];     /* virtual address              */
  57   unsigned char s_size[4];      /* section size                 */
  58   unsigned char s_scnptr[4];    /* file ptr to raw data for section */
  59   unsigned char s_relptr[4];    /* file ptr to relocation       */
  60   unsigned char s_lnnoptr[4];   /* file ptr to line numbers     */
  61   unsigned char s_nreloc[2];    /* number of relocation entries */
  62   unsigned char s_nlnno[2];     /* number of line number entries*/
  63   unsigned char s_flags[4];     /* flags                        */
  64 };
  65
  66 #define SCNHDR  struct external_scnhdr
  67 #define SCNHSZ  sizeof(SCNHDR)
  68
  69 /*
  70  * names of "special" sections
  71  */
  72 #define _TEXT   ".text"
  73 #define _DATA   ".data"
  74 #define _BSS    ".bss"
  75 #define _RDATA  ".rdata"
  76 #define _SDATA  ".sdata"
  77 #define _SBSS   ".sbss"
  78 #define _LIT4   ".lit4"
  79 #define _LIT8   ".lit8"
  80
  81 #define DEFAULT_DATA_SECTION_ALIGNMENT 4
  82 #define DEFAULT_BSS_SECTION_ALIGNMENT 4
  83 #define DEFAULT_TEXT_SECTION_ALIGNMENT 16
  84 /* For new sections we havn't heard of before */
  85 #define DEFAULT_SECTION_ALIGNMENT 4
  86
  87 /* MIPS ECOFF uses some additional section types.  */
  88 #define STYP_RDATA 0x100
  89 #define STYP_SDATA 0x200
  90 #define STYP_SBSS 0x400
  91 #define STYP_LIT8 0x8000000
  92 #define STYP_LIT4 0x10000000
  93
  94 /* I don't know when this is used.  */
  95 #define STYP_OTHER_LOAD 0x80000000
  96
  97 /********************** RELOCATION DIRECTIVES **********************/
  98
  99 struct external_reloc {
 100   unsigned char r_vaddr[4];
 101   unsigned char r_symndx[4];
 102   unsigned char r_type[2];
 103   unsigned char pad[2];
 104 };
 105
 106
 107 /* Relevent values for r_type and ecoff.  Would someone please document them */
 108
 109 #define RELOC struct external_reloc
 110 #define RELSZ 12
 111
 112 /* gcc uses mips-tfile to output type information in special stabs
 113    entries.  These must match the corresponding definition in
 114    gcc/config/mips.h.  At some point, these should probably go into a
 115    shared include file, but currently gcc and gdb do not share any
 116    directories. */
 117 #define CODE_MASK 0x8F300
 118 #define MIPS_IS_STAB(sym) (((sym)->index & 0xFFF00) == CODE_MASK)
 119 #define MIPS_MARK_STAB(code) ((code)+CODE_MASK)
 120 #define MIPS_UNMARK_STAB(code) ((code)-CODE_MASK)
 121 #define STABS_SYMBOL "@stabs"