1/*
2 * BK Id: SCCS/s.rs6000.h 1.7 05/18/01 15:17:23 cort
3 */
4
5/********************** FILE HEADER **********************/
6
7struct external_filehdr {
8	char f_magic[2];	/* magic number			*/
9	char f_nscns[2];	/* number of sections		*/
10	char f_timdat[4];	/* time & date stamp		*/
11	char f_symptr[4];	/* file pointer to symtab	*/
12	char f_nsyms[4];	/* number of symtab entries	*/
13	char f_opthdr[2];	/* sizeof(optional hdr)		*/
14	char f_flags[2];	/* flags			*/
15};
16
17        /* IBM RS/6000 */
18#define U802WRMAGIC     0730    /* writeable text segments **chh**      */
19#define U802ROMAGIC     0735    /* readonly sharable text segments      */
20#define U802TOCMAGIC    0737    /* readonly text segments and TOC       */
21
22#define BADMAG(x)	\
23	((x).f_magic != U802ROMAGIC && (x).f_magic != U802WRMAGIC && \
24	 (x).f_magic != U802TOCMAGIC)
25
26#define	FILHDR	struct external_filehdr
27#define	FILHSZ	20
28
29
30/********************** AOUT "OPTIONAL HEADER" **********************/
31
32
33typedef struct
34{
35  unsigned char	magic[2];	/* type of file			*/
36  unsigned char	vstamp[2];	/* version stamp		*/
37  unsigned char	tsize[4];	/* text size in bytes, padded to FW bdry */
38  unsigned char	dsize[4];	/* initialized data "  "	*/
39  unsigned char	bsize[4];	/* uninitialized data "   "	*/
40  unsigned char	entry[4];	/* entry pt.			*/
41  unsigned char	text_start[4];	/* base of text used for this file */
42  unsigned char	data_start[4];	/* base of data used for this file */
43  unsigned char	o_toc[4];	/* address of TOC */
44  unsigned char	o_snentry[2];	/* section number of entry point */
45  unsigned char	o_sntext[2];	/* section number of .text section */
46  unsigned char	o_sndata[2];	/* section number of .data section */
47  unsigned char	o_sntoc[2];	/* section number of TOC */
48  unsigned char	o_snloader[2];	/* section number of .loader section */
49  unsigned char	o_snbss[2];	/* section number of .bss section */
50  unsigned char	o_algntext[2];	/* .text alignment */
51  unsigned char	o_algndata[2];	/* .data alignment */
52  unsigned char	o_modtype[2];	/* module type (??) */
53  unsigned char o_cputype[2];	/* cpu type */
54  unsigned char	o_maxstack[4];	/* max stack size (??) */
55  unsigned char o_maxdata[4];	/* max data size (??) */
56  unsigned char	o_resv2[12];	/* reserved */
57}
58AOUTHDR;
59
60#define AOUTSZ 72
61#define SMALL_AOUTSZ (28)
62#define AOUTHDRSZ 72
63
64#define	RS6K_AOUTHDR_OMAGIC	0x0107	/* old: text & data writeable */
65#define	RS6K_AOUTHDR_NMAGIC	0x0108	/* new: text r/o, data r/w */
66#define	RS6K_AOUTHDR_ZMAGIC	0x010B	/* paged: text r/o, both page-aligned */
67
68
69/********************** SECTION HEADER **********************/
70
71
72struct external_scnhdr {
73	char		s_name[8];	/* section name			*/
74	char		s_paddr[4];	/* physical address, aliased s_nlib */
75	char		s_vaddr[4];	/* virtual address		*/
76	char		s_size[4];	/* section size			*/
77	char		s_scnptr[4];	/* file ptr to raw data for section */
78	char		s_relptr[4];	/* file ptr to relocation	*/
79	char		s_lnnoptr[4];	/* file ptr to line numbers	*/
80	char		s_nreloc[2];	/* number of relocation entries	*/
81	char		s_nlnno[2];	/* number of line number entries*/
82	char		s_flags[4];	/* flags			*/
83};
84
85/*
86 * names of "special" sections
87 */
88#define _TEXT	".text"
89#define _DATA	".data"
90#define _BSS	".bss"
91#define _PAD	".pad"
92#define _LOADER	".loader"
93
94#define	SCNHDR	struct external_scnhdr
95#define	SCNHSZ	40
96
97/* XCOFF uses a special .loader section with type STYP_LOADER.  */
98#define STYP_LOADER 0x1000
99
100/* XCOFF uses a special .debug section with type STYP_DEBUG.  */
101#define STYP_DEBUG 0x2000
102
103/* XCOFF handles line number or relocation overflow by creating
104   another section header with STYP_OVRFLO set.  */
105#define STYP_OVRFLO 0x8000
106
107/********************** LINE NUMBERS **********************/
108
109/* 1 line number entry for every "breakpointable" source line in a section.
110 * Line numbers are grouped on a per function basis; first entry in a function
111 * grouping will have l_lnno = 0 and in place of physical address will be the
112 * symbol table index of the function name.
113 */
114struct external_lineno {
115	union {
116		char l_symndx[4];	/* function name symbol index, iff l_lnno == 0*/
117		char l_paddr[4];	/* (physical) address of line number	*/
118	} l_addr;
119	char l_lnno[2];	/* line number		*/
120};
121
122
123#define	LINENO	struct external_lineno
124#define	LINESZ	6
125
126
127/********************** SYMBOLS **********************/
128
129#define E_SYMNMLEN	8	/* # characters in a symbol name	*/
130#define E_FILNMLEN	14	/* # characters in a file name		*/
131#define E_DIMNUM	4	/* # array dimensions in auxiliary entry */
132
133struct external_syment
134{
135  union {
136    char e_name[E_SYMNMLEN];
137    struct {
138      char e_zeroes[4];
139      char e_offset[4];
140    } e;
141  } e;
142  char e_value[4];
143  char e_scnum[2];
144  char e_type[2];
145  char e_sclass[1];
146  char e_numaux[1];
147};
148
149
150
151#define N_BTMASK	(017)
152#define N_TMASK		(060)
153#define N_BTSHFT	(4)
154#define N_TSHIFT	(2)
155
156
157union external_auxent {
158	struct {
159		char x_tagndx[4];	/* str, un, or enum tag indx */
160		union {
161			struct {
162			    char  x_lnno[2]; /* declaration line number */
163			    char  x_size[2]; /* str/union/array size */
164			} x_lnsz;
165			char x_fsize[4];	/* size of function */
166		} x_misc;
167		union {
168			struct {		/* if ISFCN, tag, or .bb */
169			    char x_lnnoptr[4];	/* ptr to fcn line # */
170			    char x_endndx[4];	/* entry ndx past block end */
171			} x_fcn;
172			struct {		/* if ISARY, up to 4 dimen. */
173			    char x_dimen[E_DIMNUM][2];
174			} x_ary;
175		} x_fcnary;
176		char x_tvndx[2];		/* tv index */
177	} x_sym;
178
179	union {
180		char x_fname[E_FILNMLEN];
181		struct {
182			char x_zeroes[4];
183			char x_offset[4];
184		} x_n;
185	} x_file;
186
187	struct {
188		char x_scnlen[4];			/* section length */
189		char x_nreloc[2];	/* # relocation entries */
190		char x_nlinno[2];	/* # line numbers */
191	} x_scn;
192
193        struct {
194		char x_tvfill[4];	/* tv fill value */
195		char x_tvlen[2];	/* length of .tv */
196		char x_tvran[2][2];	/* tv range */
197	} x_tv;		/* info about .tv section (in auxent of symbol .tv)) */
198
199	struct {
200		unsigned char x_scnlen[4];
201		unsigned char x_parmhash[4];
202		unsigned char x_snhash[2];
203		unsigned char x_smtyp[1];
204		unsigned char x_smclas[1];
205		unsigned char x_stab[4];
206		unsigned char x_snstab[2];
207	} x_csect;
208
209};
210
211#define	SYMENT	struct external_syment
212#define	SYMESZ	18
213#define	AUXENT	union external_auxent
214#define	AUXESZ	18
215#define DBXMASK 0x80		/* for dbx storage mask */
216#define SYMNAME_IN_DEBUG(symptr) ((symptr)->n_sclass & DBXMASK)
217
218
219
220/********************** RELOCATION DIRECTIVES **********************/
221
222
223struct external_reloc {
224  char r_vaddr[4];
225  char r_symndx[4];
226  char r_size[1];
227  char r_type[1];
228};
229
230
231#define RELOC struct external_reloc
232#define RELSZ 10
233
234#define DEFAULT_DATA_SECTION_ALIGNMENT 4
235#define DEFAULT_BSS_SECTION_ALIGNMENT 4
236#define DEFAULT_TEXT_SECTION_ALIGNMENT 4
237/* For new sections we havn't heard of before */
238#define DEFAULT_SECTION_ALIGNMENT 4
239