238 lines
7.6 KiB
C
238 lines
7.6 KiB
C
/* $XFree86: xc/programs/Xserver/hw/xfree86/loader/coff.h,v 1.5 1998/07/25 16:56:12 dawes Exp $ */
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/* This file was implemented from the information in the book
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Understanding and Using COFF
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Gintaras R. Gircys
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O'Reilly, 1988
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and by looking at the Linux kernel code.
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It is therefore most likely free to use...
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If the file format changes in the COFF object, this file should be
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subsequently updated to reflect the changes.
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The actual loader module only uses a few of the COFF structures.
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Only those are included here. If you wish more information about
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COFF, thein check out the book mentioned above.
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*/
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#ifdef HAVE_XORG_CONFIG_H
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#include <xorg-config.h>
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#endif
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#ifndef _COFF_H
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#define _COFF_H
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#define E_SYMNMLEN 8 /* Number of characters in a symbol name */
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/*
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* Intel 386/486
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*/
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/*
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* FILE HEADER
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*/
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typedef struct COFF_filehdr {
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unsigned short f_magic; /* magic number */
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unsigned short f_nscns; /* number of sections */
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long f_timdat; /* time & date stamp */
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long f_symptr; /* file pointer to symtab */
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long f_nsyms; /* number of symtab entries */
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unsigned short f_opthdr; /* sizeof(optional hdr) */
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unsigned short f_flags; /* flags */
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} FILHDR;
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#define FILHSZ sizeof(FILHDR)
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/*
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* SECTION HEADER
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*/
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typedef struct COFF_scnhdr {
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char s_name[8]; /* section name */
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long s_paddr; /* physical address */
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long s_vaddr; /* virtual address */
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long s_size; /* section size */
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long s_scnptr; /* raw data for section */
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long s_relptr; /* relocation */
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long s_lnnoptr; /* line numbers */
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unsigned short s_nreloc; /* number of relocation entries */
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unsigned short s_nlnno; /* number of line number entries */
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long s_flags; /* flags */
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} SCNHDR;
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#define COFF_SCNHDR struct COFF_scnhdr
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#define COFF_SCNHSZ sizeof(COFF_SCNHDR)
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#define SCNHSZ COFF_SCNHSZ
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/*
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* the optional COFF header as used by Linux COFF
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*/
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typedef struct {
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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 */
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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 point */
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char text_start[4]; /* base of text */
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char data_start[4]; /* base of data */
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} AOUTHDR;
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/*
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* SYMBOLS
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*/
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typedef struct COFF_syment {
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union {
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char _n_name[E_SYMNMLEN]; /* Symbol name (first 8 chars) */
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struct {
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long _n_zeroes; /* Leading zeros */
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long _n_offset; /* Offset for a header section */
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} _n_n;
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char *_n_nptr[2]; /* allows for overlaying */
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} _n;
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long n_value; /* address of the segment */
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short n_scnum; /* Section number */
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unsigned short n_type; /* Type of section */
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char n_sclass; /* Loader class */
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char n_numaux; /* Number of aux entries following */
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} SYMENT;
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#define n_name _n._n_name
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#define n_nptr _n._n_nptr[1]
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#define n_zeroes _n._n_n._n_zeroes
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#define n_offset _n._n_n._n_offset
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#define COFF_E_SYMNMLEN 8 /* characters in a short symbol name */
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#define COFF_E_FILNMLEN 14 /* characters in a file name */
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#define COFF_E_DIMNUM 4 /* array dimensions in aux entry */
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#define SYMNMLEN COFF_E_SYMNMLEN
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#define SYMESZ 18 /* not really sizeof(SYMENT) due to padding */
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/* Special section number found in the symbol section */
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#define N_UNDEF 0
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#define N_ABS -1
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#define N_DEBUG -2
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/* Symbol storage class values */
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#define C_NULL 0
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#define C_EXT 2
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#define C_FILE 103
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#define C_HIDEXT 107
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/*
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* AUX Entries
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*/
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typedef struct COFF_auxent {
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long x_scnlen;
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long x_parmhash;
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unsigned short x_snhash;
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unsigned char x_smtyp;
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unsigned char x_smclas;
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long x_stab;
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unsigned short x_snstab;
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} AUXENT;
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/* Auxillary Symbol type values */
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#define XTY_ER 0 /* Enternal Reference */
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#define XTY_SD 1 /* csect section definition */
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#define XTY_LD 2 /* Label definition */
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#define XTY_CM 3 /* common csect definition */
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/* Auxillary Symbol storage mapping class values */
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#define XMC_PR 0 /* Program code */
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#define XMC_RO 1 /* Read-only constant */
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#define XMC_DB 2 /* Debug dictionary */
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#define XMC_TC 3 /* TOC entry */
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#define XMC_UA 4 /* Unclassified */
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#define XMC_RW 5 /* Read/write data */
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#define XMC_GL 6 /* Global linkage */
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#define XMC_XO 7 /* Extended operation */
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#define XMC_SV 8 /* Supervisor call descriptor */
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#define XMC_BS 9 /* BSS class */
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#define XMC_DS 10 /* Function descriptor csect */
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#define XMC_UC 11 /* Unnamed FORTRAN comon */
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#define XMC_TI 12 /* Reserved */
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#define XMC_TB 13 /* Reserved */
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#define XMC_TC0 15 /* TOC anchor */
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#define XMC_TD 16 /* Scalar data entry in TOC */
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/*
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* RELOCATION DIRECTIVES
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*/
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typedef struct COFF_reloc {
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long r_vaddr; /* Virtual address of item */
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long r_symndx; /* Symbol index in the symtab */
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#if defined(__powerpc__)
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union {
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unsigned short _r_type; /* old style coff relocation type */
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struct {
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char _r_rsize; /* sign and reloc bit len */
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char _r_rtype; /* toc relocation type */
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} _r_r;
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} _r;
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#define r_otype _r._r_type /* old style reloc - original name */
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#define r_rsize _r._r_r._r_rsize /* extract sign and bit len */
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#define r_type _r._r_r._r_rtype /* extract toc relocation type */
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#else
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unsigned short r_type; /* Relocation type */
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#endif
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} RELOC;
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#define COFF_RELOC struct COFF_reloc
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#define COFF_RELSZ 10
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#define RELSZ COFF_RELSZ
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/*
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* x86 Relocation types
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*/
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#define R_ABS 000
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#define R_DIR32 006
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#define R_PCRLONG 024
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#if defined(__powerpc__)
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/*
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* Power PC
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*/
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#define R_LEN 0x1F /* extract bit-length field */
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#define R_SIGN 0x80 /* extract sign of relocation */
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#define R_FIXUP 0x40 /* extract code-fixup bit */
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#define RELOC_RLEN(x) ((x)._r._r_r._r_rsize & R_LEN)
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#define RELOC_RSIGN(x) ((x)._r._r_r._r_rsize & R_SIGN)
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#define RELOC_RFIXUP(x) ((x)._r._r_r._r_rsize & R_FIXUP)
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#define RELOC_RTYPE(x) ((x)._r._r_r._r_rtype)
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/*
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* POWER and PowerPC - relocation types
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*/
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#define R_POS 0x00 /* A(sym) Positive Relocation */
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#define R_NEG 0x01 /* -A(sym) Negative Relocation */
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#define R_REL 0x02 /* A(sym-*) Relative to self */
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#define R_TOC 0x03 /* A(sym-TOC) Relative to TOC */
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#define R_TRL 0x12 /* A(sym-TOC) TOC Relative indirect load. */
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/* modifiable instruction */
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#define R_TRLA 0x13 /* A(sym-TOC) TOC Rel load address. modifiable inst */
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#define R_GL 0x05 /* A(external TOC of sym) Global Linkage */
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#define R_TCL 0x06 /* A(local TOC of sym) Local object TOC address */
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#define R_RL 0x0C /* A(sym) Pos indirect load. modifiable instruction */
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#define R_RLA 0x0D /* A(sym) Pos Load Address. modifiable instruction */
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#define R_REF 0x0F /* AL0(sym) Non relocating ref. No garbage collect */
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#define R_BA 0x08 /* A(sym) Branch absolute. Cannot modify instruction */
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#define R_RBA 0x18 /* A(sym) Branch absolute. modifiable instruction */
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#define R_RBAC 0x19 /* A(sym) Branch absolute constant. modifiable instr */
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#define R_BR 0x0A /* A(sym-*) Branch rel to self. non modifiable */
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#define R_RBR 0x1A /* A(sym-*) Branch rel to self. modifiable instr */
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#define R_RBRC 0x1B /* A(sym-*) Branch absolute const. */
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/* modifiable to R_RBR */
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#define R_RTB 0x04 /* A((sym-*)/2) RT IAR Rel Branch. non modifiable */
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#define R_RRTBI 0x14 /* A((sym-*)/2) RT IAR Rel Br. modifiable to R_RRTBA */
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#define R_RRTBA 0x15 /* A((sym-*)/2) RT absolute br. modifiable to R_RRTBI */
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#endif /* __powerpc */
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#endif /* _COFF_H */
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