1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
|
/* COFF spec for AMD 290*0
Contributed by David Wood @ New York University.
*/
#ifndef AMD
# define AMD
#endif
/****************************************************************/
/*
** File Header and related definitions
*/
struct external_filehdr
{
char f_magic[2]; /* magic number */
char f_nscns[2]; /* number of sections */
char f_timdat[4]; /* time & date stamp */
char f_symptr[4]; /* file pointer to symtab */
char f_nsyms[4]; /* number of symtab entries */
char f_opthdr[2]; /* sizeof(optional hdr) */
char f_flags[2]; /* flags */
};
#define FILHDR struct external_filehdr
#define FILHSZ 20
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
/*
** Magic numbers for Am29000
** (AT&T will assign the "real" magic number)
*/
#define SIPFBOMAGIC 0572 /* Am29000 (Byte 0 is MSB) */
#define SIPRBOMAGIC 0573 /* Am29000 (Byte 0 is LSB) */
#define A29K_MAGIC_BIG SIPFBOMAGIC
#define A29K_MAGIC_LITTLE SIPRBOMAGIC
#define A29KBADMAG(x) (((x).f_magic!=A29K_MAGIC_BIG) && \
((x).f_magic!=A29K_MAGIC_LITTLE))
#define OMAGIC A29K_MAGIC_BIG
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
/*
** File header flags currently known to us.
**
** Am29000 will use the F_AR32WR and F_AR32W flags to indicate
** the byte ordering in the file.
*/
/*--------------------------------------------------------------*/
/*
** Optional (a.out) header
*/
typedef struct external_aouthdr
{
char magic[2]; /* type of file */
char vstamp[2]; /* version stamp */
char tsize[4]; /* text size in bytes, padded to FW bdry*/
char dsize[4]; /* initialized data " " */
char bsize[4]; /* uninitialized data " " */
char entry[4]; /* entry pt. */
char text_start[4]; /* base of text used for this file */
char data_start[4]; /* base of data used for this file */
} AOUTHDR;
#define AOUTSZ 28
#define AOUTHDRSZ 28
/* aouthdr magic numbers */
#define NMAGIC 0410 /* separate i/d executable */
#define SHMAGIC 0406 /* NYU/Ultra3 shared data executable
(writable text) */
#define _ETEXT "_etext"
/*--------------------------------------------------------------*/
/*
** Section header and related definitions
*/
struct external_scnhdr
{
char s_name[8]; /* section name */
char s_paddr[4]; /* physical address, aliased s_nlib */
char s_vaddr[4]; /* virtual address */
char s_size[4]; /* section size */
char s_scnptr[4]; /* file ptr to raw data for section */
char s_relptr[4]; /* file ptr to relocation */
char s_lnnoptr[4]; /* file ptr to line numbers */
char s_nreloc[2]; /* number of relocation entries */
char s_nlnno[2]; /* number of line number entries*/
char s_flags[4]; /* flags */
};
#define SCNHDR struct external_scnhdr
#define SCNHSZ 40
/*
* names of "special" sections
*/
#define _TEXT ".text"
#define _DATA ".data"
#define _BSS ".bss"
#define _LIT ".lit"
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
/*
** Section types - with additional section type for global
** registers which will be relocatable for the Am29000.
**
** In instances where it is necessary for a linker to produce an
** output file which contains text or data not based at virtual
** address 0, e.g. for a ROM, then the linker should accept
** address base information as command input and use PAD sections
** to skip over unused addresses.
*/
#define STYP_BSSREG 0x1200 /* Global register area (like STYP_INFO) */
#define STYP_ENVIR 0x2200 /* Environment (like STYP_INFO) */
#define STYP_ABS 0x4000 /* Absolute (allocated, not reloc, loaded) */
/*--------------------------------------------------------------*/
/*
** Relocation information declaration and related definitions
*/
struct external_reloc {
char r_vaddr[4]; /* (virtual) address of reference */
char r_symndx[4]; /* index into symbol table */
char r_type[2]; /* relocation type */
};
#define RELOC struct external_reloc
#define RELSZ 10 /* sizeof (RELOC) */
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
/*
** Relocation types for the Am29000
*/
#define R_ABS 0 /* reference is absolute */
#define R_IREL 030 /* instruction relative (jmp/call) */
#define R_IABS 031 /* instruction absolute (jmp/call) */
#define R_ILOHALF 032 /* instruction low half (const) */
#define R_IHIHALF 033 /* instruction high half (consth) part 1 */
#define R_IHCONST 034 /* instruction high half (consth) part 2 */
/* constant offset of R_IHIHALF relocation */
#define R_BYTE 035 /* relocatable byte value */
#define R_HWORD 036 /* relocatable halfword value */
#define R_WORD 037 /* relocatable word value */
#define R_IGLBLRC 040 /* instruction global register RC */
#define R_IGLBLRA 041 /* instruction global register RA */
#define R_IGLBLRB 042 /* instruction global register RB */
/*
NOTE:
All the "I" forms refer to 29000 instruction formats. The linker is
expected to know how the numeric information is split and/or aligned
within the instruction word(s). R_BYTE works for instructions, too.
If the parameter to a CONSTH instruction is a relocatable type, two
relocation records are written. The first has an r_type of R_IHIHALF
(33 octal) and a normal r_vaddr and r_symndx. The second relocation
record has an r_type of R_IHCONST (34 octal), a normal r_vaddr (which
is redundant), and an r_symndx containing the 32-bit constant offset
to the relocation instead of the actual symbol table index. This
second record is always written, even if the constant offset is zero.
The constant fields of the instruction are set to zero.
*/
/*--------------------------------------------------------------*/
/*
** Line number entry declaration and related definitions
*/
struct external_lineno
{
union {
char l_symndx[4]; /* function name symbol index, iff l_lnno == 0*/
char l_paddr[4]; /* (physical) address of line number */
} l_addr;
char l_lnno[2]; /* line number */
};
#define LINENO struct external_lineno
#define LINESZ 6 /* sizeof (LINENO) */
/*--------------------------------------------------------------*/
/*
** Symbol entry declaration and related definitions
*/
#define E_SYMNMLEN 8 /* Number of characters in a symbol name */
struct external_syment
{
union {
char e_name[E_SYMNMLEN];
struct {
char e_zeroes[4];
char e_offset[4];
} e;
} e;
char e_value[4];
char e_scnum[2];
char e_type[2];
char e_sclass[1];
char e_numaux[1];
};
#define SYMENT struct external_syment
#define SYMESZ 18
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
/*
** Storage class definitions - new classes for global registers.
*/
#define C_GLBLREG 19 /* global register */
#define C_EXTREG 20 /* external global register */
#define C_DEFREG 21 /* ext. def. of global register */
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
/*
** Derived symbol mask/shifts.
*/
#define N_BTMASK (0xf)
#define N_BTSHFT (4)
#define N_TMASK (0x30)
#define N_TSHIFT (2)
/*--------------------------------------------------------------*/
/*
** Auxiliary symbol table entry declaration and related
** definitions.
*/
#define E_FILNMLEN 14 /* # characters in a file name */
#define E_DIMNUM 4 /* # array dimensions in auxiliary entry */
union external_auxent {
struct {
char x_tagndx[4]; /* str, un, or enum tag indx */
union {
struct {
char x_lnno[2]; /* declaration line number */
char x_size[2]; /* str/union/array size */
} x_lnsz;
char x_fsize[4]; /* size of function */
} x_misc;
union {
struct { /* if ISFCN, tag, or .bb */
char x_lnnoptr[4]; /* ptr to fcn line # */
char x_endndx[4]; /* entry ndx past block end */
} x_fcn;
struct { /* if ISARY, up to 4 dimen. */
char x_dimen[E_DIMNUM][2];
} x_ary;
} x_fcnary;
char x_tvndx[2]; /* tv index */
} x_sym;
union {
char x_fname[E_FILNMLEN];
struct {
char x_zeroes[4];
char x_offset[4];
} x_n;
} x_file;
struct {
char x_scnlen[4]; /* section length */
char x_nreloc[2]; /* # relocation entries */
char x_nlinno[2]; /* # line numbers */
} x_scn;
struct {
char x_tvfill[4]; /* tv fill value */
char x_tvlen[2]; /* length of .tv */
char x_tvran[2][2]; /* tv range */
} x_tv; /* info about .tv section (in auxent of symbol .tv)) */
};
#define AUXENT union external_auxent
#define AUXESZ 18
|
