306 lines
8.4 KiB
C
306 lines
8.4 KiB
C
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/* COFF spec for AMD 290*0
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Contributed by David Wood @ New York University.
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*/
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#ifndef AMD
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# define AMD
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#endif
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/****************************************************************/
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/*
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** File Header and related definitions
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*/
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struct external_filehdr
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{
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char f_magic[2]; /* magic number */
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char f_nscns[2]; /* number of sections */
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char f_timdat[4]; /* time & date stamp */
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char f_symptr[4]; /* file pointer to symtab */
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char f_nsyms[4]; /* number of symtab entries */
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char f_opthdr[2]; /* sizeof(optional hdr) */
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char f_flags[2]; /* flags */
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};
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#define FILHDR struct external_filehdr
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#define FILHSZ 20
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
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/*
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** Magic numbers for Am29000
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** (AT&T will assign the "real" magic number)
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*/
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#define SIPFBOMAGIC 0572 /* Am29000 (Byte 0 is MSB) */
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#define SIPRBOMAGIC 0573 /* Am29000 (Byte 0 is LSB) */
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#define A29K_MAGIC_BIG SIPFBOMAGIC
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#define A29K_MAGIC_LITTLE SIPRBOMAGIC
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#define A29KBADMAG(x) (((x).f_magic!=A29K_MAGIC_BIG) && \
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((x).f_magic!=A29K_MAGIC_LITTLE))
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#define OMAGIC A29K_MAGIC_BIG
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
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/*
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** File header flags currently known to us.
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**
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** Am29000 will use the F_AR32WR and F_AR32W flags to indicate
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** the byte ordering in the file.
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*/
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/*--------------------------------------------------------------*/
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/*
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** Optional (a.out) header
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*/
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typedef struct external_aouthdr
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{
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char magic[2]; /* type of file */
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char vstamp[2]; /* version stamp */
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char tsize[4]; /* text size in bytes, padded to FW bdry*/
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char dsize[4]; /* initialized data " " */
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char bsize[4]; /* uninitialized data " " */
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char entry[4]; /* entry pt. */
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char text_start[4]; /* base of text used for this file */
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char data_start[4]; /* base of data used for this file */
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} AOUTHDR;
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#define AOUTSZ 28
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#define AOUTHDRSZ 28
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/* aouthdr magic numbers */
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#define NMAGIC 0410 /* separate i/d executable */
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#define SHMAGIC 0406 /* NYU/Ultra3 shared data executable
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(writable text) */
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#define _ETEXT "_etext"
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/*--------------------------------------------------------------*/
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/*
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** Section header and related definitions
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*/
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struct external_scnhdr
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{
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char s_name[8]; /* section name */
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char s_paddr[4]; /* physical address, aliased s_nlib */
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char s_vaddr[4]; /* virtual address */
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char s_size[4]; /* section size */
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char s_scnptr[4]; /* file ptr to raw data for section */
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char s_relptr[4]; /* file ptr to relocation */
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char s_lnnoptr[4]; /* file ptr to line numbers */
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char s_nreloc[2]; /* number of relocation entries */
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char s_nlnno[2]; /* number of line number entries*/
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char s_flags[4]; /* flags */
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};
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#define SCNHDR struct external_scnhdr
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#define SCNHSZ 40
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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 _LIT ".lit"
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
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/*
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** Section types - with additional section type for global
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** registers which will be relocatable for the Am29000.
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**
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** In instances where it is necessary for a linker to produce an
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** output file which contains text or data not based at virtual
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** address 0, e.g. for a ROM, then the linker should accept
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** address base information as command input and use PAD sections
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** to skip over unused addresses.
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*/
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#define STYP_BSSREG 0x1200 /* Global register area (like STYP_INFO) */
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#define STYP_ENVIR 0x2200 /* Environment (like STYP_INFO) */
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#define STYP_ABS 0x4000 /* Absolute (allocated, not reloc, loaded) */
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/*--------------------------------------------------------------*/
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/*
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** Relocation information declaration and related definitions
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*/
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struct external_reloc {
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char r_vaddr[4]; /* (virtual) address of reference */
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char r_symndx[4]; /* index into symbol table */
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char r_type[2]; /* relocation type */
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};
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#define RELOC struct external_reloc
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#define RELSZ 10 /* sizeof (RELOC) */
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
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/*
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** Relocation types for the Am29000
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*/
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#define R_ABS 0 /* reference is absolute */
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#define R_IREL 030 /* instruction relative (jmp/call) */
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#define R_IABS 031 /* instruction absolute (jmp/call) */
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#define R_ILOHALF 032 /* instruction low half (const) */
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#define R_IHIHALF 033 /* instruction high half (consth) part 1 */
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#define R_IHCONST 034 /* instruction high half (consth) part 2 */
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/* constant offset of R_IHIHALF relocation */
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#define R_BYTE 035 /* relocatable byte value */
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#define R_HWORD 036 /* relocatable halfword value */
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#define R_WORD 037 /* relocatable word value */
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#define R_IGLBLRC 040 /* instruction global register RC */
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#define R_IGLBLRA 041 /* instruction global register RA */
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#define R_IGLBLRB 042 /* instruction global register RB */
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/*
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NOTE:
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All the "I" forms refer to 29000 instruction formats. The linker is
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expected to know how the numeric information is split and/or aligned
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within the instruction word(s). R_BYTE works for instructions, too.
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If the parameter to a CONSTH instruction is a relocatable type, two
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relocation records are written. The first has an r_type of R_IHIHALF
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(33 octal) and a normal r_vaddr and r_symndx. The second relocation
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record has an r_type of R_IHCONST (34 octal), a normal r_vaddr (which
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is redundant), and an r_symndx containing the 32-bit constant offset
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to the relocation instead of the actual symbol table index. This
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second record is always written, even if the constant offset is zero.
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The constant fields of the instruction are set to zero.
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*/
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/*--------------------------------------------------------------*/
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/*
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** Line number entry declaration and related definitions
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*/
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struct external_lineno
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{
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union {
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char l_symndx[4]; /* function name symbol index, iff l_lnno == 0*/
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char l_paddr[4]; /* (physical) address of line number */
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} l_addr;
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char l_lnno[2]; /* line number */
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};
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#define LINENO struct external_lineno
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#define LINESZ 6 /* sizeof (LINENO) */
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/*--------------------------------------------------------------*/
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/*
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** Symbol entry declaration and related definitions
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*/
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#define E_SYMNMLEN 8 /* Number of characters in a symbol name */
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struct external_syment
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{
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union {
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char e_name[E_SYMNMLEN];
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struct {
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char e_zeroes[4];
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char e_offset[4];
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} e;
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} e;
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char e_value[4];
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char e_scnum[2];
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char e_type[2];
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char e_sclass[1];
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char e_numaux[1];
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};
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#define SYMENT struct external_syment
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#define SYMESZ 18
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
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/*
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** Storage class definitions - new classes for global registers.
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*/
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#define C_GLBLREG 19 /* global register */
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#define C_EXTREG 20 /* external global register */
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#define C_DEFREG 21 /* ext. def. of global register */
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
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/*
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** Derived symbol mask/shifts.
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*/
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#define N_BTMASK (0xf)
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#define N_BTSHFT (4)
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#define N_TMASK (0x30)
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#define N_TSHIFT (2)
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/*--------------------------------------------------------------*/
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/*
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** Auxiliary symbol table entry declaration and related
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** definitions.
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*/
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#define E_FILNMLEN 14 /* # characters in a file name */
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#define E_DIMNUM 4 /* # array dimensions in auxiliary entry */
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union external_auxent {
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struct {
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char x_tagndx[4]; /* str, un, or enum tag indx */
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union {
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struct {
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char x_lnno[2]; /* declaration line number */
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char x_size[2]; /* str/union/array size */
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} x_lnsz;
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char x_fsize[4]; /* size of function */
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} x_misc;
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union {
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struct { /* if ISFCN, tag, or .bb */
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char x_lnnoptr[4]; /* ptr to fcn line # */
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char x_endndx[4]; /* entry ndx past block end */
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} x_fcn;
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struct { /* if ISARY, up to 4 dimen. */
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char x_dimen[E_DIMNUM][2];
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} x_ary;
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} x_fcnary;
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char x_tvndx[2]; /* tv index */
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} x_sym;
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union {
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char x_fname[E_FILNMLEN];
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struct {
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char x_zeroes[4];
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char x_offset[4];
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} x_n;
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} x_file;
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struct {
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char x_scnlen[4]; /* section length */
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char x_nreloc[2]; /* # relocation entries */
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char x_nlinno[2]; /* # line numbers */
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} x_scn;
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struct {
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char x_tvfill[4]; /* tv fill value */
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char x_tvlen[2]; /* length of .tv */
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char x_tvran[2][2]; /* tv range */
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} x_tv; /* info about .tv section (in auxent of symbol .tv)) */
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};
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#define AUXENT union external_auxent
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#define AUXESZ 18
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