78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
/****************************************************************
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* *
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* Copyright 2001 Sanchez Computer Associates, Inc. *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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struct exec {
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short a_magic; /* magic number */
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short a_stamp; /* version stamp - RTU 2.0+ uses this - see below */
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uint4 a_text; /* size of text segment */
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uint4 a_data; /* size of initialized data */
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uint4 a_bss; /* size of uninitialized data */
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uint4 a_syms; /* size of symbol table */
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uint4 a_entry; /* entry point */
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uint4 a_trsize; /* size of text relocation */
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uint4 a_drsize; /* size of data relocation */
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};
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/*
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* Format of a relocation datum.
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*/
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struct relocation_info {
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int r_address; /* address which is relocated */
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unsigned int r_symbolnum:24, /* local symbol ordinal */
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r_pcrel:1, /* was relocated pc relative already */
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r_length:2, /* 0=byte, 1=word, 2=int4 */
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r_extern:1, /* does not include value of sym referenced */
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r_pad:4; /* nothing, yet */
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};
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struct rel_table {
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struct rel_table *next, *resolve;
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struct relocation_info r;
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};
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/*
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* Format of a symbol table entry; this file is included by <a.out.h>
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* and should be used if you aren't interested the a.out header
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* or relocation information.
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*/
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struct nlist {
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int4 n_strx; /* index into file string table */
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unsigned char n_type; /* type flag, i.e. N_TEXT etc; see below */
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char n_other; /* unused */
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short n_desc; /* see <stab.h> */
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uint4 n_value; /* value of this symbol (or sdb offset) */
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};
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struct sym_table {
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struct sym_table *next;
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struct nlist n;
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struct rel_table *resolve;
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unsigned short name_len;
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unsigned char name[1];
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};
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/*
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* Simple values for n_type.
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*/
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#define N_UNDF 0x0 /* undefined */
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#define N_ABS 0x2 /* absolute */
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#define N_TEXT 0x4 /* text */
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#define N_DATA 0x6 /* data */
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#define N_BSS 0x8 /* bss */
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#define N_COMM 0x12 /* common (internal to ld) */
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#define N_IPCOMM 0x16 /* initialized private */
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#define N_PCOMM 0x18 /* uninitialized private */
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#define N_FN 0x1f /* file name symbol */
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#define N_EXT 01 /* external bit, or'ed in */
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#define N_TYPE 0x1e /* mask for all the type bits */
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