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