1/* SPDX-License-Identifier: GPL-2.0 */
2/* IBM RS/6000 "XCOFF" file definitions for BFD.
3   Copyright (C) 1990, 1991 Free Software Foundation, Inc.
4   FIXME: Can someone provide a transliteration of this name into ASCII?
5   Using the following chars caused a compiler warning on HIUX (so I replaced
6   them with octal escapes), and isn't useful without an understanding of what
7   character set it is.
8   Written by Mimi Ph\373\364ng-Th\345o V\365 of IBM
9   and John Gilmore of Cygnus Support.  */
10
11/********************** FILE HEADER **********************/
12
13struct external_filehdr {
14	char f_magic[2];	/* magic number			*/
15	char f_nscns[2];	/* number of sections		*/
16	char f_timdat[4];	/* time & date stamp		*/
17	char f_symptr[4];	/* file pointer to symtab	*/
18	char f_nsyms[4];	/* number of symtab entries	*/
19	char f_opthdr[2];	/* sizeof(optional hdr)		*/
20	char f_flags[2];	/* flags			*/
21};
22
23        /* IBM RS/6000 */
24#define U802WRMAGIC     0730    /* writeable text segments **chh**      */
25#define U802ROMAGIC     0735    /* readonly sharable text segments      */
26#define U802TOCMAGIC    0737    /* readonly text segments and TOC       */
27
28#define BADMAG(x)	\
29	((x).f_magic != U802ROMAGIC && (x).f_magic != U802WRMAGIC && \
30	 (x).f_magic != U802TOCMAGIC)
31
32#define	FILHDR	struct external_filehdr
33#define	FILHSZ	20
34
35
36/********************** AOUT "OPTIONAL HEADER" **********************/
37
38
39typedef struct
40{
41  unsigned char	magic[2];	/* type of file			*/
42  unsigned char	vstamp[2];	/* version stamp		*/
43  unsigned char	tsize[4];	/* text size in bytes, padded to FW bdry */
44  unsigned char	dsize[4];	/* initialized data "  "	*/
45  unsigned char	bsize[4];	/* uninitialized data "   "	*/
46  unsigned char	entry[4];	/* entry pt.			*/
47  unsigned char	text_start[4];	/* base of text used for this file */
48  unsigned char	data_start[4];	/* base of data used for this file */
49  unsigned char	o_toc[4];	/* address of TOC */
50  unsigned char	o_snentry[2];	/* section number of entry point */
51  unsigned char	o_sntext[2];	/* section number of .text section */
52  unsigned char	o_sndata[2];	/* section number of .data section */
53  unsigned char	o_sntoc[2];	/* section number of TOC */
54  unsigned char	o_snloader[2];	/* section number of .loader section */
55  unsigned char	o_snbss[2];	/* section number of .bss section */
56  unsigned char	o_algntext[2];	/* .text alignment */
57  unsigned char	o_algndata[2];	/* .data alignment */
58  unsigned char	o_modtype[2];	/* module type (??) */
59  unsigned char o_cputype[2];	/* cpu type */
60  unsigned char	o_maxstack[4];	/* max stack size (??) */
61  unsigned char o_maxdata[4];	/* max data size (??) */
62  unsigned char	o_resv2[12];	/* reserved */
63}
64AOUTHDR;
65
66#define AOUTSZ 72
67#define SMALL_AOUTSZ (28)
68#define AOUTHDRSZ 72
69
70#define	RS6K_AOUTHDR_OMAGIC	0x0107	/* old: text & data writeable */
71#define	RS6K_AOUTHDR_NMAGIC	0x0108	/* new: text r/o, data r/w */
72#define	RS6K_AOUTHDR_ZMAGIC	0x010B	/* paged: text r/o, both page-aligned */
73
74
75/********************** SECTION HEADER **********************/
76
77
78struct external_scnhdr {
79	char		s_name[8];	/* section name			*/
80	char		s_paddr[4];	/* physical address, aliased s_nlib */
81	char		s_vaddr[4];	/* virtual address		*/
82	char		s_size[4];	/* section size			*/
83	char		s_scnptr[4];	/* file ptr to raw data for section */
84	char		s_relptr[4];	/* file ptr to relocation	*/
85	char		s_lnnoptr[4];	/* file ptr to line numbers	*/
86	char		s_nreloc[2];	/* number of relocation entries	*/
87	char		s_nlnno[2];	/* number of line number entries*/
88	char		s_flags[4];	/* flags			*/
89};
90
91/*
92 * names of "special" sections
93 */
94#define _TEXT	".text"
95#define _DATA	".data"
96#define _BSS	".bss"
97#define _PAD	".pad"
98#define _LOADER	".loader"
99
100#define	SCNHDR	struct external_scnhdr
101#define	SCNHSZ	40
102
103/* XCOFF uses a special .loader section with type STYP_LOADER.  */
104#define STYP_LOADER 0x1000
105
106/* XCOFF uses a special .debug section with type STYP_DEBUG.  */
107#define STYP_DEBUG 0x2000
108
109/* XCOFF handles line number or relocation overflow by creating
110   another section header with STYP_OVRFLO set.  */
111#define STYP_OVRFLO 0x8000
112
113/********************** LINE NUMBERS **********************/
114
115/* 1 line number entry for every "breakpointable" source line in a section.
116 * Line numbers are grouped on a per function basis; first entry in a function
117 * grouping will have l_lnno = 0 and in place of physical address will be the
118 * symbol table index of the function name.
119 */
120struct external_lineno {
121	union {
122		char l_symndx[4];	/* function name symbol index, iff l_lnno == 0*/
123		char l_paddr[4];	/* (physical) address of line number	*/
124	} l_addr;
125	char l_lnno[2];	/* line number		*/
126};
127
128
129#define	LINENO	struct external_lineno
130#define	LINESZ	6
131
132
133/********************** SYMBOLS **********************/
134
135#define E_SYMNMLEN	8	/* # characters in a symbol name	*/
136#define E_FILNMLEN	14	/* # characters in a file name		*/
137#define E_DIMNUM	4	/* # array dimensions in auxiliary entry */
138
139struct external_syment
140{
141  union {
142    char e_name[E_SYMNMLEN];
143    struct {
144      char e_zeroes[4];
145      char e_offset[4];
146    } e;
147  } e;
148  char e_value[4];
149  char e_scnum[2];
150  char e_type[2];
151  char e_sclass[1];
152  char e_numaux[1];
153};
154
155
156
157#define N_BTMASK	(017)
158#define N_TMASK		(060)
159#define N_BTSHFT	(4)
160#define N_TSHIFT	(2)
161
162
163union external_auxent {
164	struct {
165		char x_tagndx[4];	/* str, un, or enum tag indx */
166		union {
167			struct {
168			    char  x_lnno[2]; /* declaration line number */
169			    char  x_size[2]; /* str/union/array size */
170			} x_lnsz;
171			char x_fsize[4];	/* size of function */
172		} x_misc;
173		union {
174			struct {		/* if ISFCN, tag, or .bb */
175			    char x_lnnoptr[4];	/* ptr to fcn line # */
176			    char x_endndx[4];	/* entry ndx past block end */
177			} x_fcn;
178			struct {		/* if ISARY, up to 4 dimen. */
179			    char x_dimen[E_DIMNUM][2];
180			} x_ary;
181		} x_fcnary;
182		char x_tvndx[2];		/* tv index */
183	} x_sym;
184
185	union {
186		char x_fname[E_FILNMLEN];
187		struct {
188			char x_zeroes[4];
189			char x_offset[4];
190		} x_n;
191	} x_file;
192
193	struct {
194		char x_scnlen[4];			/* section length */
195		char x_nreloc[2];	/* # relocation entries */
196		char x_nlinno[2];	/* # line numbers */
197	} x_scn;
198
199        struct {
200		char x_tvfill[4];	/* tv fill value */
201		char x_tvlen[2];	/* length of .tv */
202		char x_tvran[2][2];	/* tv range */
203	} x_tv;		/* info about .tv section (in auxent of symbol .tv)) */
204
205	struct {
206		unsigned char x_scnlen[4];
207		unsigned char x_parmhash[4];
208		unsigned char x_snhash[2];
209		unsigned char x_smtyp[1];
210		unsigned char x_smclas[1];
211		unsigned char x_stab[4];
212		unsigned char x_snstab[2];
213	} x_csect;
214
215};
216
217#define	SYMENT	struct external_syment
218#define	SYMESZ	18
219#define	AUXENT	union external_auxent
220#define	AUXESZ	18
221#define DBXMASK 0x80		/* for dbx storage mask */
222#define SYMNAME_IN_DEBUG(symptr) ((symptr)->n_sclass & DBXMASK)
223
224
225
226/********************** RELOCATION DIRECTIVES **********************/
227
228
229struct external_reloc {
230  char r_vaddr[4];
231  char r_symndx[4];
232  char r_size[1];
233  char r_type[1];
234};
235
236
237#define RELOC struct external_reloc
238#define RELSZ 10
239
240#define DEFAULT_DATA_SECTION_ALIGNMENT 4
241#define DEFAULT_BSS_SECTION_ALIGNMENT 4
242#define DEFAULT_TEXT_SECTION_ALIGNMENT 4
243/* For new sections we haven't heard of before */
244#define DEFAULT_SECTION_ALIGNMENT 4
245