xref: /linux/arch/powerpc/boot/rs6000.h (revision 44f57d78)
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 
13 struct 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 
39 typedef 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 }
64 AOUTHDR;
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 
78 struct 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  */
120 struct 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 
139 struct 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 
163 union 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 
229 struct 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