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