119 lines
4 KiB
C
Executable file
119 lines
4 KiB
C
Executable file
/* The <a.out> header file describes the format of executable files. */
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#ifndef _AOUT_H
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#define _AOUT_H
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struct exec { /* a.out header */
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unsigned char a_magic[2]; /* magic number */
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unsigned char a_flags; /* flags, see below */
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unsigned char a_cpu; /* cpu id */
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unsigned char a_hdrlen; /* length of header */
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unsigned char a_unused; /* reserved for future use */
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unsigned short a_version; /* version stamp (not used at present) */
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long a_text; /* size of text segement in bytes */
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long a_data; /* size of data segment in bytes */
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long a_bss; /* size of bss segment in bytes */
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long a_entry; /* entry point */
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long a_total; /* total memory allocated */
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long a_syms; /* size of symbol table */
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/* SHORT FORM ENDS HERE */
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long a_trsize; /* text relocation size */
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long a_drsize; /* data relocation size */
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long a_tbase; /* text relocation base */
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long a_dbase; /* data relocation base */
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};
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#define A_MAGIC0 (unsigned char) 0x01
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#define A_MAGIC1 (unsigned char) 0x03
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#define BADMAG(X) ((X).a_magic[0] != A_MAGIC0 ||(X).a_magic[1] != A_MAGIC1)
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/* CPU Id of TARGET machine (byte order coded in low order two bits) */
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#define A_NONE 0x00 /* unknown */
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#define A_I8086 0x04 /* intel i8086/8088 */
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#define A_M68K 0x0B /* motorola m68000 */
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#define A_NS16K 0x0C /* national semiconductor 16032 */
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#define A_I80386 0x10 /* intel i80386 */
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#define A_SPARC 0x17 /* Sun SPARC */
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#define A_BLR(cputype) ((cputype&0x01)!=0) /* TRUE if bytes left-to-right */
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#define A_WLR(cputype) ((cputype&0x02)!=0) /* TRUE if words left-to-right */
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/* Flags. */
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#define A_UZP 0x01 /* unmapped zero page (pages) */
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#define A_PAL 0x02 /* page aligned executable */
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#define A_NSYM 0x04 /* new style symbol table */
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#define A_IMG 0x08 /* image instead of executable (e.g. root FS) */
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#define A_EXEC 0x10 /* executable */
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#define A_SEP 0x20 /* separate I/D */
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#define A_PURE 0x40 /* pure text */ /* not used */
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#define A_TOVLY 0x80 /* text overlay */ /* not used */
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/* Offsets of various things. */
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#define A_MINHDR 32
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#define A_TEXTPOS(X) ((long)(X).a_hdrlen)
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#define A_DATAPOS(X) (A_TEXTPOS(X) + (X).a_text)
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#define A_HASRELS(X) ((X).a_hdrlen > (unsigned char) A_MINHDR)
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#define A_HASEXT(X) ((X).a_hdrlen > (unsigned char) (A_MINHDR + 8))
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#define A_HASLNS(X) ((X).a_hdrlen > (unsigned char) (A_MINHDR + 16))
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#define A_HASTOFF(X) ((X).a_hdrlen > (unsigned char) (A_MINHDR + 24))
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#define A_TRELPOS(X) (A_DATAPOS(X) + (X).a_data)
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#define A_DRELPOS(X) (A_TRELPOS(X) + (X).a_trsize)
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#define A_SYMPOS(X) (A_TRELPOS(X) + (A_HASRELS(X) ? \
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((X).a_trsize + (X).a_drsize) : 0))
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struct reloc {
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long r_vaddr; /* virtual address of reference */
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unsigned short r_symndx; /* internal segnum or extern symbol num */
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unsigned short r_type; /* relocation type */
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};
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/* r_tyep values: */
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#define R_ABBS 0
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#define R_RELLBYTE 2
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#define R_PCRBYTE 3
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#define R_RELWORD 4
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#define R_PCRWORD 5
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#define R_RELLONG 6
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#define R_PCRLONG 7
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#define R_REL3BYTE 8
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#define R_KBRANCHE 9
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/* r_symndx for internal segments */
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#define S_ABS ((unsigned short)-1)
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#define S_TEXT ((unsigned short)-2)
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#define S_DATA ((unsigned short)-3)
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#define S_BSS ((unsigned short)-4)
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struct nlist { /* symbol table entry */
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char n_name[8]; /* symbol name */
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long n_value; /* value */
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unsigned char n_sclass; /* storage class */
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unsigned char n_numaux; /* number of auxiliary entries (not used) */
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unsigned short n_type; /* language base and derived type (not used) */
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};
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/* Low bits of storage class (section). */
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#define N_SECT 07 /* section mask */
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#define N_UNDF 00 /* undefined */
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#define N_ABS 01 /* absolute */
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#define N_TEXT 02 /* text */
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#define N_DATA 03 /* data */
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#define N_BSS 04 /* bss */
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#define N_COMM 05 /* (common) */
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/* High bits of storage class. */
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#define N_CLASS 0370 /* storage class mask */
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#define C_NULL
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#define C_EXT 0020 /* external symbol */
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#define C_STAT 0030 /* static */
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/* Function prototypes. */
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#ifndef _ANSI_H
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#include <ansi.h>
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#endif
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_PROTOTYPE( int nlist, (char *_file, struct nlist *_nl) );
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#endif /* _AOUT_H */
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