/* Rudimentary ECOFF support on MIPS machines. This lacks symbol information, normally provided on MIPS Unix systems in the files and . */ /********************** FILE HEADER **********************/ struct external_filehdr { unsigned char f_magic[2]; /* magic number */ unsigned char f_nscns[2]; /* number of sections */ unsigned char f_timdat[4]; /* time & date stamp */ unsigned char f_symptr[4]; /* file pointer to symtab */ unsigned char f_nsyms[4]; /* number of symtab entries */ unsigned char f_opthdr[2]; /* sizeof(optional hdr) */ unsigned char f_flags[2]; /* flags */ }; /* Mips magic numbers used in filehdr. MIPS_MAGIC_LITTLE is used on little endian machines. MIPS_MAGIC_BIG is used on big endian machines. Where is MIPS_MAGIC_1 from? */ #define MIPS_MAGIC_1 0x0180 #define MIPS_MAGIC_LITTLE 0x0162 #define MIPS_MAGIC_BIG 0x0160 #define ECOFFBADMAG(x) (((x).f_magic!=MIPS_MAGIC_1) && \ ((x).f_magic!=MIPS_MAGIC_LITTLE) &&\ ((x).f_magic!=MIPS_MAGIC_BIG)) #define FILHDR struct external_filehdr #define FILHSZ 20 /********************** AOUT "OPTIONAL HEADER" **********************/ typedef struct external_aouthdr { unsigned char magic[2]; /* type of file */ unsigned char vstamp[2]; /* version stamp */ unsigned char tsize[4]; /* text size in bytes, padded to FW bdry*/ unsigned char dsize[4]; /* initialized data " " */ unsigned char bsize[4]; /* uninitialized data " " */ unsigned char entry[4]; /* entry pt. */ unsigned char text_start[4]; /* base of text used for this file */ unsigned char data_start[4]; /* base of data used for this file */ unsigned char bss_start[4]; /* base of bss used for this file */ unsigned char gprmask[4]; /* ?? */ unsigned char cprmask[4][4]; /* ?? */ unsigned char gp_value[4]; /* value for gp register */ } AOUTHDR; /* compute size of a header */ #define AOUTSZ (sizeof(AOUTHDR)) #define OMAGIC 0407 /* not demand paged (ld -N). */ #define ZMAGIC 0413 /* demand load format, eg normal ld output */ /********************** SECTION HEADER **********************/ struct external_scnhdr { unsigned char s_name[8]; /* section name */ unsigned char s_paddr[4]; /* physical address, aliased s_nlib */ unsigned char s_vaddr[4]; /* virtual address */ unsigned char s_size[4]; /* section size */ unsigned char s_scnptr[4]; /* file ptr to raw data for section */ unsigned char s_relptr[4]; /* file ptr to relocation */ unsigned char s_lnnoptr[4]; /* file ptr to line numbers */ unsigned char s_nreloc[2]; /* number of relocation entries */ unsigned char s_nlnno[2]; /* number of line number entries*/ unsigned char s_flags[4]; /* flags */ }; #define SCNHDR struct external_scnhdr #define SCNHSZ sizeof(SCNHDR) /* * names of "special" sections */ #define _TEXT ".text" #define _DATA ".data" #define _BSS ".bss" #define _RDATA ".rdata" #define _SDATA ".sdata" #define _SBSS ".sbss" #define _LIT4 ".lit4" #define _LIT8 ".lit8" #define _LIB ".lib" #define DEFAULT_DATA_SECTION_ALIGNMENT 4 #define DEFAULT_BSS_SECTION_ALIGNMENT 4 #define DEFAULT_TEXT_SECTION_ALIGNMENT 16 /* For new sections we havn't heard of before */ #define DEFAULT_SECTION_ALIGNMENT 4 /* MIPS ECOFF uses some additional section types. */ #define STYP_RDATA 0x100 #define STYP_SDATA 0x200 #define STYP_SBSS 0x400 #define STYP_LIT8 0x8000000 #define STYP_LIT4 0x10000000 /* I don't know when this is used. */ #define STYP_OTHER_LOAD 0x80000000 /********************** RELOCATION DIRECTIVES **********************/ struct external_reloc { unsigned char r_vaddr[4]; unsigned char r_bits[4]; }; #define RELOC struct external_reloc #define RELSZ 8 /* MIPS ECOFF uses a packed 8 byte format for relocs. These constants are used to unpack the r_bits field. */ #define RELOC_BITS0_SYMNDX_SH_LEFT_BIG 16 #define RELOC_BITS0_SYMNDX_SH_LEFT_LITTLE 0 #define RELOC_BITS1_SYMNDX_SH_LEFT_BIG 8 #define RELOC_BITS1_SYMNDX_SH_LEFT_LITTLE 8 #define RELOC_BITS2_SYMNDX_SH_LEFT_BIG 0 #define RELOC_BITS2_SYMNDX_SH_LEFT_LITTLE 16 #define RELOC_BITS3_TYPE_BIG 0x1E #define RELOC_BITS3_TYPE_SH_BIG 1 #define RELOC_BITS3_TYPE_LITTLE 0x78 #define RELOC_BITS3_TYPE_SH_LITTLE 3 #define RELOC_BITS3_EXTERN_BIG 0x01 #define RELOC_BITS3_EXTERN_LITTLE 0x80 /* We store the extern field in the r_offset field of a struct internal_reloc. FIXME: Do this more sensibly. */ #define r_extern r_offset /* If the extern bit is 1, then r_symndx is an index into the external symbol table. If the extern bit is 0, then r_symndx indicates a section, and is one of the following values. */ #define RELOC_SECTION_TEXT 1 #define RELOC_SECTION_RDATA 2 #define RELOC_SECTION_DATA 3 #define RELOC_SECTION_SDATA 4 #define RELOC_SECTION_SBSS 5 #define RELOC_SECTION_BSS 6 #define RELOC_SECTION_INIT 7 #define RELOC_SECTION_LIT8 8 #define RELOC_SECTION_LIT4 9 /* The r_type field is one of the following values. I don't know if any other values can appear. These seem to be all that occur in the Ultrix 4.2 libraries. */ #define ECOFF_R_IGNORE 0 #define ECOFF_R_REFHALF 1 #define ECOFF_R_REFWORD 2 #define ECOFF_R_JMPADDR 3 #define ECOFF_R_REFHI 4 #define ECOFF_R_REFLO 5 #define ECOFF_R_GPREL 6 #define ECOFF_R_LITERAL 7 /********************** STABS **********************/ /* gcc uses mips-tfile to output type information in special stabs entries. These must match the corresponding definition in gcc/config/mips.h. At some point, these should probably go into a shared include file, but currently gcc and gdb do not share any directories. */ #define CODE_MASK 0x8F300 #define MIPS_IS_STAB(sym) (((sym)->index & 0xFFF00) == CODE_MASK) #define MIPS_MARK_STAB(code) ((code)+CODE_MASK) #define MIPS_UNMARK_STAB(code) ((code)-CODE_MASK) #define STABS_SYMBOL "@stabs" /********************** COFF **********************/ /* gcc also uses mips-tfile to output COFF debugging information. These are the values it uses when outputting the .type directive. These should also be in a shared include file. */ #define N_BTMASK (017) #define N_TMASK (060) #define N_BTSHFT (4) #define N_TSHIFT (2)