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/* Rudimentary ECOFF support on MIPS machines.
This lacks symbol information, normally provided on MIPS Unix systems
in the files <sym.h> and <symconst.h>. */
/********************** 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)
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