/* @(#)a.out.h 1.1 85/12/18 SMI; from UCB 4.1 83/05/03 */ /* * format of the exec header * known by kernel and by user programs */ struct exec { #ifdef sun unsigned short a_machtype; /* machine type */ unsigned short a_magic; /* magic number */ #else unsigned long a_magic; /* magic number */ #endif unsigned long a_text; /* size of text segment */ unsigned long a_data; /* size of initialized data */ unsigned long a_bss; /* size of uninitialized data */ unsigned long a_syms; /* size of symbol table */ unsigned long a_entry; /* entry point */ unsigned long a_trsize; /* size of text relocation */ unsigned long a_drsize; /* size of data relocation */ }; #define OMAGIC 0407 /* old impure format */ #define NMAGIC 0410 /* read-only text */ #define ZMAGIC 0413 /* demand load format */ /* machine types */ #ifdef sun #define M_OLDSUN2 0 /* old sun-2 executable files */ #define M_68010 1 /* runs on either 68010 or 68020 */ #define M_68020 2 /* runs only on 68020 */ #endif sun /* * memory management parameters */ #ifdef sun #define PAGSIZ 0x2000 #define SEGSIZ 0x20000 #define OLD_PAGSIZ 0x800 /* THIS DISAPPEARS IN RELEASE 4.0 */ #define OLD_SEGSIZ 0x8000 /* THIS DISAPPEARS IN RELEASE 4.0 */ #endif sun #ifdef vax #define PAGSIZ 1024 #define SEGSIZ PAGSIZ #endif vax /* * returns 1 if an object file type is invalid, i.e., if the other macros * defined below will not yield the correct offsets. Note that a file may * have N_BADMAG(x) = 0 and may be fully linked, but still may not be * executable. */ #define N_BADMAG(x) \ ((x).a_magic!=OMAGIC && (x).a_magic!=NMAGIC && (x).a_magic!=ZMAGIC) /* * relocation parameters. These are architecture-dependent * and can be deduced from the machine type. They are used * to calculate offsets of segments within the object file; * See N_TXTOFF(x), etc. below. */ #ifdef sun #define N_PAGSIZ(x) \ ((x).a_machtype == M_OLDSUN2? OLD_PAGSIZ : PAGSIZ) #define N_SEGSIZ(x) \ ((x).a_machtype == M_OLDSUN2? OLD_SEGSIZ : SEGSIZ) #endif sun #ifdef vax #define N_PAGSIZ(x) PAGSIZ #define N_SEGSIZ(x) SEGSIZ #endif vax /* * offsets of various sections of an object file. */ #ifdef sun #define N_TXTOFF(x) \ /* text segment */ \ ( (x).a_machtype == M_OLDSUN2 \ ? ((x).a_magic==ZMAGIC ? N_PAGSIZ(x) : sizeof (struct exec)) \ : ((x).a_magic==ZMAGIC ? 0 : sizeof (struct exec)) ) #endif sun #ifdef vax #define N_TXTOFF(x) \ ((x).a_magic==ZMAGIC ? PAGSIZ : sizeof (struct exec)) #endif vax #define N_SYMOFF(x) \ /* symbol table */ \ (N_TXTOFF(x)+(x).a_text+(x).a_data+(x).a_trsize+(x).a_drsize) #define N_STROFF(x) \ /* string table */ \ (N_SYMOFF(x) + (x).a_syms) /* * Macros which take exec structures as arguments and tell where the * various pieces will be loaded. */ #ifdef sun #define N_TXTADDR(x) \ ((x).a_machtype == M_OLDSUN2? N_SEGSIZ(x) : N_PAGSIZ(x)) #endif sun #ifdef vax #define TXTRELOC 0 #define N_TXTADDR(x) TXTRELOC #endif vax #define N_DATADDR(x) \ (((x).a_magic==OMAGIC)? (N_TXTADDR(x)+(x).a_text) \ : (N_SEGSIZ(x)+((N_TXTADDR(x)+(x).a_text-1) & ~(N_SEGSIZ(x)-1)))) #define N_BSSADDR(x) (N_DATADDR(x)+(x).a_data) /* * Format of a relocation datum. */ struct relocation_info { long r_address; /* address which is relocated */ unsigned int r_symbolnum:24, /* local symbol ordinal */ r_pcrel:1, /* was relocated pc relative already */ r_length:2, /* 0=byte, 1=word, 2=long */ r_extern:1, /* does not include value of sym referenced */ :4; /* nothing, yet */ }; /* * Format of a symbol table entry */ struct nlist { union { char *n_name; /* for use when in-core */ long n_strx; /* index into file string table */ } n_un; unsigned char n_type; /* type flag (N_TEXT,..) */ char n_other; /* unused */ short n_desc; /* see <stab.h> */ unsigned long n_value; /* value of symbol (or sdb offset) */ }; /* * Simple values for n_type. */ #define N_UNDF 0x0 /* undefined */ #define N_ABS 0x2 /* absolute */ #define N_TEXT 0x4 /* text */ #define N_DATA 0x6 /* data */ #define N_BSS 0x8 /* bss */ #define N_COMM 0x12 /* common (internal to ld) */ #define N_FN 0x1f /* file name symbol */ #define N_EXT 01 /* external bit, or'ed in */ #define N_TYPE 0x1e /* mask for all the type bits */ /* * Dbx entries have some of the N_STAB bits set. * These are given in <stab.h> */ #define N_STAB 0xe0 /* if any of these bits set, a dbx symbol */ /* * Format for namelist values. */ #define N_FORMAT "%08x"