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Diffstat (limited to 'hw/xfree86/loader/coff.h')
| -rw-r--r-- | hw/xfree86/loader/coff.h | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/hw/xfree86/loader/coff.h b/hw/xfree86/loader/coff.h new file mode 100644 index 000000000..cebf5e179 --- /dev/null +++ b/hw/xfree86/loader/coff.h @@ -0,0 +1,244 @@ +/* $XFree86: xc/programs/Xserver/hw/xfree86/loader/coff.h,v 1.5 1998/07/25 16:56:12 dawes Exp $ */ + + +/* This file was implemented from the information in the book + Understanding and Using COFF + Gintaras R. Gircys + O'Reilly, 1988 + and by looking at the Linux kernel code. + + It is therefore most likely free to use... + + If the file format changes in the COFF object, this file should be + subsequently updated to reflect the changes. + + The actual loader module only uses a few of the COFF structures. + Only those are included here. If you wish more information about + COFF, thein check out the book mentioned above. +*/ + +#ifndef _COFF_H +#define _COFF_H + +#define E_SYMNMLEN 8 /* Number of characters in a symbol name */ +/* + * Intel 386/486 + */ + +/* + * FILE HEADER + */ + +typedef struct COFF_filehdr +{ + unsigned short f_magic; /* magic number */ + unsigned short f_nscns; /* number of sections */ + long f_timdat; /* time & date stamp */ + long f_symptr; /* file pointer to symtab */ + long f_nsyms; /* number of symtab entries */ + unsigned short f_opthdr; /* sizeof(optional hdr) */ + unsigned short f_flags; /* flags */ +} FILHDR; + +#define FILHSZ sizeof(FILHDR) + +/* + * SECTION HEADER + */ + +typedef struct COFF_scnhdr +{ + char s_name[8]; /* section name */ + long s_paddr; /* physical address */ + long s_vaddr; /* virtual address */ + long s_size; /* section size */ + long s_scnptr; /* raw data for section */ + long s_relptr; /* relocation */ + long s_lnnoptr; /* line numbers */ + unsigned short s_nreloc; /* number of relocation entries */ + unsigned short s_nlnno; /* number of line number entries*/ + long s_flags; /* flags */ +} SCNHDR; + +#define COFF_SCNHDR struct COFF_scnhdr +#define COFF_SCNHSZ sizeof(COFF_SCNHDR) +#define SCNHSZ COFF_SCNHSZ + +/* + * the optional COFF header as used by Linux COFF + */ + +typedef struct +{ + char magic[2]; /* type of file */ + char vstamp[2]; /* version stamp */ + char tsize[4]; /* text size in bytes */ + char dsize[4]; /* initialized data */ + char bsize[4]; /* uninitialized data */ + char entry[4]; /* entry point */ + char text_start[4]; /* base of text */ + char data_start[4]; /* base of data */ +} AOUTHDR; + + +/* + * SYMBOLS + */ + +typedef struct COFF_syment +{ + union + { + char _n_name[E_SYMNMLEN]; /* Symbol name (first 8 chars) */ + struct + { + long _n_zeroes; /* Leading zeros */ + long _n_offset; /* Offset for a header section */ + } _n_n; + char *_n_nptr[2]; /* allows for overlaying */ + } _n; + + long n_value; /* address of the segment */ + short n_scnum; /* Section number */ + unsigned short n_type; /* Type of section */ + char n_sclass; /* Loader class */ + char n_numaux; /* Number of aux entries following */ +} SYMENT; + +#define n_name _n._n_name +#define n_nptr _n._n_nptr[1] +#define n_zeroes _n._n_n._n_zeroes +#define n_offset _n._n_n._n_offset + +#define COFF_E_SYMNMLEN 8 /* characters in a short symbol name */ +#define COFF_E_FILNMLEN 14 /* characters in a file name */ +#define COFF_E_DIMNUM 4 /* array dimensions in aux entry */ +#define SYMNMLEN COFF_E_SYMNMLEN +#define SYMESZ 18 /* not really sizeof(SYMENT) due to padding */ + +/* Special section number found in the symbol section */ +#define N_UNDEF 0 +#define N_ABS -1 +#define N_DEBUG -2 + +/* Symbol storage class values */ +#define C_NULL 0 +#define C_EXT 2 +#define C_FILE 103 +#define C_HIDEXT 107 + +/* + * AUX Entries + */ +typedef struct COFF_auxent { + long x_scnlen; + long x_parmhash; + unsigned short x_snhash; + unsigned char x_smtyp; + unsigned char x_smclas; + long x_stab; + unsigned short x_snstab; +} AUXENT; + +/* Auxillary Symbol type values */ +#define XTY_ER 0 /* Enternal Reference */ +#define XTY_SD 1 /* csect section definition */ +#define XTY_LD 2 /* Label definition */ +#define XTY_CM 3 /* common csect definition */ + +/* Auxillary Symbol storage mapping class values */ +#define XMC_PR 0 /* Program code */ +#define XMC_RO 1 /* Read-only constant */ +#define XMC_DB 2 /* Debug dictionary */ +#define XMC_TC 3 /* TOC entry */ +#define XMC_UA 4 /* Unclassified */ +#define XMC_RW 5 /* Read/write data */ +#define XMC_GL 6 /* Global linkage */ +#define XMC_XO 7 /* Extended operation */ +#define XMC_SV 8 /* Supervisor call descriptor */ +#define XMC_BS 9 /* BSS class */ +#define XMC_DS 10 /* Function descriptor csect */ +#define XMC_UC 11 /* Unnamed FORTRAN comon */ +#define XMC_TI 12 /* Reserved */ +#define XMC_TB 13 /* Reserved */ +#define XMC_TC0 15 /* TOC anchor */ +#define XMC_TD 16 /* Scalar data entry in TOC */ + +/* + * RELOCATION DIRECTIVES + */ + +typedef struct COFF_reloc +{ + long r_vaddr; /* Virtual address of item */ + long r_symndx; /* Symbol index in the symtab */ +#if defined(__powerpc__) + union + { + unsigned short _r_type; /* old style coff relocation type */ + struct + { + char _r_rsize; /* sign and reloc bit len */ + char _r_rtype; /* toc relocation type */ + } _r_r; + } _r; +#define r_otype _r._r_type /* old style reloc - original name */ +#define r_rsize _r._r_r._r_rsize /* extract sign and bit len */ +#define r_type _r._r_r._r_rtype /* extract toc relocation type */ +#else + unsigned short r_type; /* Relocation type */ +#endif +} RELOC; + +#define COFF_RELOC struct COFF_reloc +#define COFF_RELSZ 10 +#define RELSZ COFF_RELSZ + +/* + * x86 Relocation types + */ +#define R_ABS 000 +#define R_DIR32 006 +#define R_PCRLONG 024 + +#if defined(__powerpc__) +/* + * Power PC + */ +#define R_LEN 0x1F /* extract bit-length field */ +#define R_SIGN 0x80 /* extract sign of relocation */ +#define R_FIXUP 0x40 /* extract code-fixup bit */ + +#define RELOC_RLEN(x) ((x)._r._r_r._r_rsize & R_LEN) +#define RELOC_RSIGN(x) ((x)._r._r_r._r_rsize & R_SIGN) +#define RELOC_RFIXUP(x) ((x)._r._r_r._r_rsize & R_FIXUP) +#define RELOC_RTYPE(x) ((x)._r._r_r._r_rtype) + +/* + * POWER and PowerPC - relocation types + */ +#define R_POS 0x00 /* A(sym) Positive Relocation */ +#define R_NEG 0x01 /* -A(sym) Negative Relocation */ +#define R_REL 0x02 /* A(sym-*) Relative to self */ +#define R_TOC 0x03 /* A(sym-TOC) Relative to TOC */ +#define R_TRL 0x12 /* A(sym-TOC) TOC Relative indirect load. */ + /* modifiable instruction */ +#define R_TRLA 0x13 /* A(sym-TOC) TOC Rel load address. modifiable inst */ +#define R_GL 0x05 /* A(external TOC of sym) Global Linkage */ +#define R_TCL 0x06 /* A(local TOC of sym) Local object TOC address */ +#define R_RL 0x0C /* A(sym) Pos indirect load. modifiable instruction */ +#define R_RLA 0x0D /* A(sym) Pos Load Address. modifiable instruction */ +#define R_REF 0x0F /* AL0(sym) Non relocating ref. No garbage collect */ +#define R_BA 0x08 /* A(sym) Branch absolute. Cannot modify instruction */ +#define R_RBA 0x18 /* A(sym) Branch absolute. modifiable instruction */ +#define R_RBAC 0x19 /* A(sym) Branch absolute constant. modifiable instr */ +#define R_BR 0x0A /* A(sym-*) Branch rel to self. non modifiable */ +#define R_RBR 0x1A /* A(sym-*) Branch rel to self. modifiable instr */ +#define R_RBRC 0x1B /* A(sym-*) Branch absolute const. */ + /* modifiable to R_RBR */ +#define R_RTB 0x04 /* A((sym-*)/2) RT IAR Rel Branch. non modifiable */ +#define R_RRTBI 0x14 /* A((sym-*)/2) RT IAR Rel Br. modifiable to R_RRTBA */ +#define R_RRTBA 0x15 /* A((sym-*)/2) RT absolute br. modifiable to R_RRTBI */ +#endif /* __powerpc */ + +#endif /* _COFF_H */ |