1 /* ECOFF support on MIPS machines.
2 coff/ecoff.h must be included before this file. */
4 /********************** FILE HEADER **********************/
6 struct external_filehdr
{
7 unsigned char f_magic
[2]; /* magic number */
8 unsigned char f_nscns
[2]; /* number of sections */
9 unsigned char f_timdat
[4]; /* time & date stamp */
10 unsigned char f_symptr
[4]; /* file pointer to symtab */
11 unsigned char f_nsyms
[4]; /* number of symtab entries */
12 unsigned char f_opthdr
[2]; /* sizeof(optional hdr) */
13 unsigned char f_flags
[2]; /* flags */
16 /* Magic numbers are defined in coff/ecoff.h. */
17 #define MIPS_ECOFF_BADMAG(x) (((x).f_magic!=MIPS_MAGIC_1) && \
18 ((x).f_magic!=MIPS_MAGIC_LITTLE) &&\
19 ((x).f_magic!=MIPS_MAGIC_BIG) && \
20 ((x).f_magic!=MIPS_MAGIC_LITTLE2) && \
21 ((x).f_magic!=MIPS_MAGIC_BIG2) && \
22 ((x).f_magic!=MIPS_MAGIC_LITTLE3) && \
23 ((x).f_magic!=MIPS_MAGIC_BIG3))
25 #define FILHDR struct external_filehdr
28 /********************** AOUT "OPTIONAL HEADER" **********************/
31 typedef struct external_aouthdr
33 unsigned char magic
[2]; /* type of file */
34 unsigned char vstamp
[2]; /* version stamp */
35 unsigned char tsize
[4]; /* text size in bytes, padded to FW bdry*/
36 unsigned char dsize
[4]; /* initialized data " " */
37 unsigned char bsize
[4]; /* uninitialized data " " */
38 unsigned char entry
[4]; /* entry pt. */
39 unsigned char text_start
[4]; /* base of text used for this file */
40 unsigned char data_start
[4]; /* base of data used for this file */
41 unsigned char bss_start
[4]; /* base of bss used for this file */
42 unsigned char gprmask
[4]; /* ?? */
43 unsigned char cprmask
[4][4]; /* ?? */
44 unsigned char gp_value
[4]; /* value for gp register */
47 /* compute size of a header */
49 #define AOUTSZ (sizeof(AOUTHDR))
51 /********************** SECTION HEADER **********************/
53 struct external_scnhdr
{
54 unsigned char s_name
[8]; /* section name */
55 unsigned char s_paddr
[4]; /* physical address, aliased s_nlib */
56 unsigned char s_vaddr
[4]; /* virtual address */
57 unsigned char s_size
[4]; /* section size */
58 unsigned char s_scnptr
[4]; /* file ptr to raw data for section */
59 unsigned char s_relptr
[4]; /* file ptr to relocation */
60 unsigned char s_lnnoptr
[4]; /* file ptr to line numbers */
61 unsigned char s_nreloc
[2]; /* number of relocation entries */
62 unsigned char s_nlnno
[2]; /* number of line number entries*/
63 unsigned char s_flags
[4]; /* flags */
66 #define SCNHDR struct external_scnhdr
67 #define SCNHSZ sizeof(SCNHDR)
69 /********************** RELOCATION DIRECTIVES **********************/
71 struct external_reloc
{
72 unsigned char r_vaddr
[4];
73 unsigned char r_bits
[4];
76 #define RELOC struct external_reloc
79 /* MIPS ECOFF uses a packed 8 byte format for relocs. These constants
80 are used to unpack the r_bits field. */
82 #define RELOC_BITS0_SYMNDX_SH_LEFT_BIG 16
83 #define RELOC_BITS0_SYMNDX_SH_LEFT_LITTLE 0
85 #define RELOC_BITS1_SYMNDX_SH_LEFT_BIG 8
86 #define RELOC_BITS1_SYMNDX_SH_LEFT_LITTLE 8
88 #define RELOC_BITS2_SYMNDX_SH_LEFT_BIG 0
89 #define RELOC_BITS2_SYMNDX_SH_LEFT_LITTLE 16
91 #define RELOC_BITS3_TYPE_BIG 0x1E
92 #define RELOC_BITS3_TYPE_SH_BIG 1
93 #define RELOC_BITS3_TYPE_LITTLE 0x78
94 #define RELOC_BITS3_TYPE_SH_LITTLE 3
96 #define RELOC_BITS3_EXTERN_BIG 0x01
97 #define RELOC_BITS3_EXTERN_LITTLE 0x80
99 /* The r_type field in a reloc is one of the following values. I
100 don't know if any other values can appear. These seem to be all
101 that occur in the Ultrix 4.2 libraries. */
102 #define MIPS_R_IGNORE 0
103 #define MIPS_R_REFHALF 1
104 #define MIPS_R_REFWORD 2
105 #define MIPS_R_JMPADDR 3
106 #define MIPS_R_REFHI 4
107 #define MIPS_R_REFLO 5
108 #define MIPS_R_GPREL 6
109 #define MIPS_R_LITERAL 7
111 /* This reloc type is a Cygnus extension used when generating position
112 independent code for embedded systems. */
113 #define MIPS_R_PCREL16 8
115 /* This reloc type is a Cygnus extension used when generating position
116 independent code for embedded systems. It is used for an entry in
117 a switch table, which looks like this:
119 The object file will contain the correct difference, and does not
120 require adjustment. However, when the linker is relaxing PC
121 relative calls, it is possible for $L3 to move farther away. This
122 reloc always appears in the .text section, and is always against
123 the .text section. However, the symbol index is not
124 RELOC_SECTION_TEXT. It is, instead, the distance between this
125 switch table entry and $LS12. Thus, the original value of $L12 is
127 and the original value of $L3 is
128 vaddr - symndx + addend
129 where addend is the value in the object file. Knowing this, the
130 linker can know whether the addend in the object file must be
132 #define MIPS_R_SWITCH 9
134 /********************** STABS **********************/
136 #define MIPS_IS_STAB ECOFF_IS_STAB
137 #define MIPS_MARK_STAB ECOFF_MARK_STAB
138 #define MIPS_UNMARK_STAB ECOFF_UNMARK_STAB
140 #define DEFAULT_DATA_SECTION_ALIGNMENT 4
141 #define DEFAULT_BSS_SECTION_ALIGNMENT 4
142 #define DEFAULT_TEXT_SECTION_ALIGNMENT 16
143 /* For new sections we havn't heard of before */
144 #define DEFAULT_SECTION_ALIGNMENT 4
146 /********************** SYMBOLIC INFORMATION **********************/
148 /* Written by John Gilmore. */
150 /* ECOFF uses COFF-like section structures, but its own symbol format.
151 This file defines the symbol format in fields whose size and alignment
152 will not vary on different host systems. */
154 /* File header as a set of bytes */
157 unsigned char h_magic
[2];
158 unsigned char h_vstamp
[2];
159 unsigned char h_ilineMax
[4];
160 unsigned char h_cbLine
[4];
161 unsigned char h_cbLineOffset
[4];
162 unsigned char h_idnMax
[4];
163 unsigned char h_cbDnOffset
[4];
164 unsigned char h_ipdMax
[4];
165 unsigned char h_cbPdOffset
[4];
166 unsigned char h_isymMax
[4];
167 unsigned char h_cbSymOffset
[4];
168 unsigned char h_ioptMax
[4];
169 unsigned char h_cbOptOffset
[4];
170 unsigned char h_iauxMax
[4];
171 unsigned char h_cbAuxOffset
[4];
172 unsigned char h_issMax
[4];
173 unsigned char h_cbSsOffset
[4];
174 unsigned char h_issExtMax
[4];
175 unsigned char h_cbSsExtOffset
[4];
176 unsigned char h_ifdMax
[4];
177 unsigned char h_cbFdOffset
[4];
178 unsigned char h_crfd
[4];
179 unsigned char h_cbRfdOffset
[4];
180 unsigned char h_iextMax
[4];
181 unsigned char h_cbExtOffset
[4];
184 /* File descriptor external record */
187 unsigned char f_adr
[4];
188 unsigned char f_rss
[4];
189 unsigned char f_issBase
[4];
190 unsigned char f_cbSs
[4];
191 unsigned char f_isymBase
[4];
192 unsigned char f_csym
[4];
193 unsigned char f_ilineBase
[4];
194 unsigned char f_cline
[4];
195 unsigned char f_ioptBase
[4];
196 unsigned char f_copt
[4];
197 unsigned char f_ipdFirst
[2];
198 unsigned char f_cpd
[2];
199 unsigned char f_iauxBase
[4];
200 unsigned char f_caux
[4];
201 unsigned char f_rfdBase
[4];
202 unsigned char f_crfd
[4];
203 unsigned char f_bits1
[1];
204 unsigned char f_bits2
[3];
205 unsigned char f_cbLineOffset
[4];
206 unsigned char f_cbLine
[4];
209 #define FDR_BITS1_LANG_BIG 0xF8
210 #define FDR_BITS1_LANG_SH_BIG 3
211 #define FDR_BITS1_LANG_LITTLE 0x1F
212 #define FDR_BITS1_LANG_SH_LITTLE 0
214 #define FDR_BITS1_FMERGE_BIG 0x04
215 #define FDR_BITS1_FMERGE_LITTLE 0x20
217 #define FDR_BITS1_FREADIN_BIG 0x02
218 #define FDR_BITS1_FREADIN_LITTLE 0x40
220 #define FDR_BITS1_FBIGENDIAN_BIG 0x01
221 #define FDR_BITS1_FBIGENDIAN_LITTLE 0x80
223 #define FDR_BITS2_GLEVEL_BIG 0xC0
224 #define FDR_BITS2_GLEVEL_SH_BIG 6
225 #define FDR_BITS2_GLEVEL_LITTLE 0x03
226 #define FDR_BITS2_GLEVEL_SH_LITTLE 0
228 /* We ignore the `reserved' field in bits2. */
230 /* Procedure descriptor external record */
233 unsigned char p_adr
[4];
234 unsigned char p_isym
[4];
235 unsigned char p_iline
[4];
236 unsigned char p_regmask
[4];
237 unsigned char p_regoffset
[4];
238 unsigned char p_iopt
[4];
239 unsigned char p_fregmask
[4];
240 unsigned char p_fregoffset
[4];
241 unsigned char p_frameoffset
[4];
242 unsigned char p_framereg
[2];
243 unsigned char p_pcreg
[2];
244 unsigned char p_lnLow
[4];
245 unsigned char p_lnHigh
[4];
246 unsigned char p_cbLineOffset
[4];
252 unsigned char l_line
[4];
255 /* Symbol external record */
258 unsigned char s_iss
[4];
259 unsigned char s_value
[4];
260 unsigned char s_bits1
[1];
261 unsigned char s_bits2
[1];
262 unsigned char s_bits3
[1];
263 unsigned char s_bits4
[1];
266 #define SYM_BITS1_ST_BIG 0xFC
267 #define SYM_BITS1_ST_SH_BIG 2
268 #define SYM_BITS1_ST_LITTLE 0x3F
269 #define SYM_BITS1_ST_SH_LITTLE 0
271 #define SYM_BITS1_SC_BIG 0x03
272 #define SYM_BITS1_SC_SH_LEFT_BIG 3
273 #define SYM_BITS1_SC_LITTLE 0xC0
274 #define SYM_BITS1_SC_SH_LITTLE 6
276 #define SYM_BITS2_SC_BIG 0xE0
277 #define SYM_BITS2_SC_SH_BIG 5
278 #define SYM_BITS2_SC_LITTLE 0x07
279 #define SYM_BITS2_SC_SH_LEFT_LITTLE 2
281 #define SYM_BITS2_RESERVED_BIG 0x10
282 #define SYM_BITS2_RESERVED_LITTLE 0x08
284 #define SYM_BITS2_INDEX_BIG 0x0F
285 #define SYM_BITS2_INDEX_SH_LEFT_BIG 16
286 #define SYM_BITS2_INDEX_LITTLE 0xF0
287 #define SYM_BITS2_INDEX_SH_LITTLE 4
289 #define SYM_BITS3_INDEX_SH_LEFT_BIG 8
290 #define SYM_BITS3_INDEX_SH_LEFT_LITTLE 4
292 #define SYM_BITS4_INDEX_SH_LEFT_BIG 0
293 #define SYM_BITS4_INDEX_SH_LEFT_LITTLE 12
295 /* External symbol external record */
298 unsigned char es_bits1
[1];
299 unsigned char es_bits2
[1];
300 unsigned char es_ifd
[2];
301 struct sym_ext es_asym
;
304 #define EXT_BITS1_JMPTBL_BIG 0x80
305 #define EXT_BITS1_JMPTBL_LITTLE 0x01
307 #define EXT_BITS1_COBOL_MAIN_BIG 0x40
308 #define EXT_BITS1_COBOL_MAIN_LITTLE 0x02
310 #define EXT_BITS1_WEAKEXT_BIG 0x20
311 #define EXT_BITS1_WEAKEXT_LITTLE 0x04
313 /* Dense numbers external record */
316 unsigned char d_rfd
[4];
317 unsigned char d_index
[4];
320 /* Relative file descriptor */
323 unsigned char rfd
[4];
326 /* Optimizer symbol external record */
329 unsigned char o_bits1
[1];
330 unsigned char o_bits2
[1];
331 unsigned char o_bits3
[1];
332 unsigned char o_bits4
[1];
333 struct rndx_ext o_rndx
;
334 unsigned char o_offset
[4];
337 #define OPT_BITS2_VALUE_SH_LEFT_BIG 16
338 #define OPT_BITS2_VALUE_SH_LEFT_LITTLE 0
340 #define OPT_BITS3_VALUE_SH_LEFT_BIG 8
341 #define OPT_BITS3_VALUE_SH_LEFT_LITTLE 8
343 #define OPT_BITS4_VALUE_SH_LEFT_BIG 0
344 #define OPT_BITS4_VALUE_SH_LEFT_LITTLE 16
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