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a.out.h
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C/C++ Source or Header
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1990-07-15
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4KB
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112 lines
/* The <a.out> header file describes the format of executable files. */
/* This version is intended for the Atari ST */
#ifndef _AOUT_H
#define _AOUT_H
struct exec { /* a.out header */
unsigned char a_cpu; /* cpu id */
unsigned char a_flags; /* flags, see below */
unsigned char a_magic[2]; /* magic number */
unsigned short a_version; /* version stamp */
/* not used */
unsigned char a_unused; /* reserved for future use */
unsigned char a_hdrlen; /* length of header */
long a_text; /* size of text segement in bytes */
long a_data; /* size of data segment in bytes */
long a_bss; /* size of bss segment in bytes */
long a_no_entry; /* in fact: entry point, a_entry */
long a_total; /* total memory allocated */
long a_syms; /* size of symbol table */
/* SHORT FORM ENDS HERE */
long a_trsize; /* text relocation size */
long a_drsize; /* data relocation size */
long a_tbase; /* text relocation base */
long a_dbase; /* data relocation base */
};
#define A_MAGIC0 (unsigned char) 0x03
#define A_MAGIC1 (unsigned char) 0x01
#define BADMAG(X) ((X).a_magic[0] != A_MAGIC0 ||\
(X).a_magic[1] != A_MAGIC1)
/* CPU Id of TARGET machine */
/* byte order coded in low order two bits */
#define A_NONE 0x00 /* unknown */
#define A_I8086 0x04 /* intel i8086/8088 */
#define A_M68K 0x0B /* motorola m68000 */
#define A_NS16K 0x0C /* national semiconductor 16032 */
#define A_I80386 0x10 /* intel i80386 */
#define A_BLR(cputype) ((cputype&0x01)!=0) /* TRUE if bytes left-to-right */
#define A_WLR(cputype) ((cputype&0x02)!=0) /* TRUE if words left-to-right */
/* flags: */
#define A_EXEC 0x10 /* executable */
#define A_SEP 0x20 /* separate I/D */
#define A_PURE 0x40 /* pure text */ /* not used */
#define A_TOVLY 0x80 /* text overlay */ /* not used */
/* offsets of various things: */
#define A_MINHDR 32
#define A_TEXTPOS(X) ((long)(X).a_hdrlen)
#define A_DATAPOS(X) (A_TEXTPOS(X) + (X).a_text)
#define A_HASRELS(X) ((X).a_hdrlen > (unsigned char) A_MINHDR)
#define A_HASEXT(X) ((X).a_hdrlen > (unsigned char) (A_MINHDR + 8))
#define A_HASLNS(X) ((X).a_hdrlen > (unsigned char) (A_MINHDR + 16))
#define A_HASTOFF(X) ((X).a_hdrlen > (unsigned char) (A_MINHDR + 24))
#define A_TRELPOS(X) (A_DATAPOS(X) + (X).a_data)
#define A_DRELPOS(X) (A_TRELPOS(X) + (X).a_trsize)
#define A_SYMPOS(X) (A_TRELPOS(X) + (A_HASRELS(X) ? \
((X).a_trsize + (X).a_drsize) : 0))
struct reloc {
long r_vaddr; /* virtual address of reference */
unsigned short r_symndx; /* internal segnum or extern symbol num */
unsigned short r_type; /* relocation type */
};
/* r_tyep values: */
#define R_ABBS 0
#define R_RELLBYTE 2
#define R_PCRBYTE 3
#define R_RELWORD 4
#define R_PCRWORD 5
#define R_RELLONG 6
#define R_PCRLONG 7
#define R_REL3BYTE 8
#define R_KBRANCHE 9
/* r_symndx for internal segments */
#define S_ABS ((unsigned short)-1)
#define S_TEXT ((unsigned short)-2)
#define S_DATA ((unsigned short)-3)
#define S_BSS ((unsigned short)-4)
struct nlist { /* symbol table entry */
char n_name[8]; /* symbol name */
long n_value; /* value */
unsigned char n_sclass; /* storage class */
unsigned char n_numaux; /* number of auxiliary entries */
/* not used */
unsigned short n_type; /* language base and derived type */
/* not used */
};
/* low bits of storage class (section) */
#define N_SECT 07 /* section mask */
#define N_UNDF 00 /* undefined */
#define N_ABS 01 /* absolute */
#define N_TEXT 02 /* text */
#define N_DATA 03 /* data */
#define N_BSS 04 /* bss */
#define N_COMM 05 /* (common) */
/* high bits of storage class */
#define N_CLASS 0370 /* storage class mask */
#define C_NULL
#define C_EXT 0020 /* external symbol */
#define C_STAT 0030 /* static */
#endif /* _AOUT_H */