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252b5132 RH |
1 | /* `a.out.adobe' differences from standard a.out files */ |
2 | ||
3 | #ifndef __A_OUT_ADOBE_H__ | |
4 | #define __A_OUT_ADOBE_H__ | |
5 | ||
6 | #define BYTES_IN_WORD 4 | |
7 | ||
8 | /* Struct external_exec is the same. */ | |
9 | ||
10 | /* This is the layout on disk of the 32-bit or 64-bit exec header. */ | |
11 | ||
12 | struct external_exec | |
13 | { | |
14 | bfd_byte e_info[4]; /* magic number and stuff */ | |
15 | bfd_byte e_text[BYTES_IN_WORD]; /* length of text section in bytes */ | |
16 | bfd_byte e_data[BYTES_IN_WORD]; /* length of data section in bytes */ | |
17 | bfd_byte e_bss[BYTES_IN_WORD]; /* length of bss area in bytes */ | |
18 | bfd_byte e_syms[BYTES_IN_WORD]; /* length of symbol table in bytes */ | |
19 | bfd_byte e_entry[BYTES_IN_WORD]; /* start address */ | |
20 | bfd_byte e_trsize[BYTES_IN_WORD]; /* length of text relocation info */ | |
21 | bfd_byte e_drsize[BYTES_IN_WORD]; /* length of data relocation info */ | |
22 | }; | |
23 | ||
24 | #define EXEC_BYTES_SIZE (4 + BYTES_IN_WORD * 7) | |
25 | ||
26 | /* Magic numbers for a.out files */ | |
27 | ||
28 | #undef ZMAGIC | |
29 | #define ZMAGIC 0xAD0BE /* Cute, eh? */ | |
30 | #undef OMAGIC | |
31 | #undef NMAGIC | |
32 | ||
33 | #define N_BADMAG(x) ((x).a_info != ZMAGIC) | |
34 | ||
35 | /* By default, segment size is constant. But some machines override this | |
36 | to be a function of the a.out header (e.g. machine type). */ | |
37 | #ifndef N_SEGSIZE | |
38 | #define N_SEGSIZE(x) SEGMENT_SIZE | |
39 | #endif | |
40 | #undef N_SEGSIZE /* FIXMEXXXX */ | |
41 | ||
42 | /* Segment information for the a.out.Adobe format is specified after the | |
43 | file header. It contains N segment descriptors, followed by one with | |
44 | a type of zero. | |
45 | ||
46 | The actual text of the segments starts at N_TXTOFF in the file, | |
47 | regardless of how many or how few segment headers there are. */ | |
48 | ||
49 | struct external_segdesc { | |
50 | unsigned char e_type[1]; | |
51 | unsigned char e_size[3]; | |
52 | unsigned char e_virtbase[4]; | |
53 | unsigned char e_filebase[4]; | |
54 | }; | |
55 | ||
56 | struct internal_segdesc { | |
57 | unsigned int a_type:8; /* Segment type N_TEXT, N_DATA, 0 */ | |
58 | unsigned int a_size:24; /* Segment size */ | |
59 | bfd_vma a_virtbase; /* Virtual address */ | |
60 | unsigned int a_filebase; /* Base address in object file */ | |
61 | }; | |
62 | ||
63 | #define N_TXTADDR(x) \ | |
64 | ||
65 | /* This is documented to be at 1024, but appears to really be at 2048. | |
66 | FIXME?! */ | |
67 | #define N_TXTOFF(x) 2048 | |
68 | ||
69 | #define N_TXTSIZE(x) ((x).a_text) | |
70 | ||
71 | #define N_DATADDR(x) | |
72 | ||
73 | #define N_BSSADDR(x) | |
74 | ||
75 | /* Offsets of the various portions of the file after the text segment. */ | |
76 | ||
77 | #define N_DATOFF(x) ( N_TXTOFF(x) + N_TXTSIZE(x) ) | |
78 | #define N_TRELOFF(x) ( N_DATOFF(x) + (x).a_data ) | |
79 | #define N_DRELOFF(x) ( N_TRELOFF(x) + (x).a_trsize ) | |
80 | #define N_SYMOFF(x) ( N_DRELOFF(x) + (x).a_drsize ) | |
81 | #define N_STROFF(x) ( N_SYMOFF(x) + (x).a_syms ) | |
82 | \f | |
83 | /* Symbols */ | |
84 | struct external_nlist { | |
85 | bfd_byte e_strx[BYTES_IN_WORD]; /* index into string table of name */ | |
86 | bfd_byte e_type[1]; /* type of symbol */ | |
87 | bfd_byte e_other[1]; /* misc info (usually empty) */ | |
88 | bfd_byte e_desc[2]; /* description field */ | |
89 | bfd_byte e_value[BYTES_IN_WORD]; /* value of symbol */ | |
90 | }; | |
91 | ||
92 | #define EXTERNAL_NLIST_SIZE (BYTES_IN_WORD+4+BYTES_IN_WORD) | |
93 | ||
94 | struct internal_nlist { | |
95 | unsigned long n_strx; /* index into string table of name */ | |
96 | unsigned char n_type; /* type of symbol */ | |
97 | unsigned char n_other; /* misc info (usually empty) */ | |
98 | unsigned short n_desc; /* description field */ | |
99 | bfd_vma n_value; /* value of symbol */ | |
100 | }; | |
101 | ||
102 | /* The n_type field is the symbol type, containing: */ | |
103 | ||
104 | #define N_UNDF 0 /* Undefined symbol */ | |
105 | #define N_ABS 2 /* Absolute symbol -- defined at particular addr */ | |
106 | #define N_TEXT 4 /* Text sym -- defined at offset in text seg */ | |
107 | #define N_DATA 6 /* Data sym -- defined at offset in data seg */ | |
108 | #define N_BSS 8 /* BSS sym -- defined at offset in zero'd seg */ | |
109 | #define N_COMM 0x12 /* Common symbol (visible after shared lib dynlink) */ | |
110 | #define N_FN 0x1f /* File name of .o file */ | |
111 | #define N_FN_SEQ 0x0C /* N_FN from Sequent compilers (sigh) */ | |
112 | /* Note: N_EXT can only be usefully OR-ed with N_UNDF, N_ABS, N_TEXT, | |
113 | N_DATA, or N_BSS. When the low-order bit of other types is set, | |
114 | (e.g. N_WARNING versus N_FN), they are two different types. */ | |
115 | #define N_EXT 1 /* External symbol (as opposed to local-to-this-file) */ | |
116 | #define N_TYPE 0x1e | |
117 | #define N_STAB 0xe0 /* If any of these bits are on, it's a debug symbol */ | |
118 | ||
119 | #define N_INDR 0x0a | |
120 | ||
121 | /* The following symbols refer to set elements. | |
122 | All the N_SET[ATDB] symbols with the same name form one set. | |
123 | Space is allocated for the set in the text section, and each set | |
124 | elements value is stored into one word of the space. | |
125 | The first word of the space is the length of the set (number of elements). | |
126 | ||
127 | The address of the set is made into an N_SETV symbol | |
128 | whose name is the same as the name of the set. | |
129 | This symbol acts like a N_DATA global symbol | |
130 | in that it can satisfy undefined external references. */ | |
131 | ||
132 | /* These appear as input to LD, in a .o file. */ | |
133 | #define N_SETA 0x14 /* Absolute set element symbol */ | |
134 | #define N_SETT 0x16 /* Text set element symbol */ | |
135 | #define N_SETD 0x18 /* Data set element symbol */ | |
136 | #define N_SETB 0x1A /* Bss set element symbol */ | |
137 | ||
138 | /* This is output from LD. */ | |
139 | #define N_SETV 0x1C /* Pointer to set vector in data area. */ | |
140 | ||
141 | /* Warning symbol. The text gives a warning message, the next symbol | |
142 | in the table will be undefined. When the symbol is referenced, the | |
143 | message is printed. */ | |
144 | ||
145 | #define N_WARNING 0x1e | |
146 | ||
147 | /* Relocations | |
148 | ||
149 | There are two types of relocation flavours for a.out systems, | |
150 | standard and extended. The standard form is used on systems where the | |
151 | instruction has room for all the bits of an offset to the operand, whilst | |
152 | the extended form is used when an address operand has to be split over n | |
153 | instructions. Eg, on the 68k, each move instruction can reference | |
154 | the target with a displacement of 16 or 32 bits. On the sparc, move | |
155 | instructions use an offset of 14 bits, so the offset is stored in | |
156 | the reloc field, and the data in the section is ignored. | |
157 | */ | |
158 | ||
159 | /* This structure describes a single relocation to be performed. | |
160 | The text-relocation section of the file is a vector of these structures, | |
161 | all of which apply to the text section. | |
162 | Likewise, the data-relocation section applies to the data section. */ | |
163 | ||
164 | struct reloc_std_external { | |
165 | bfd_byte r_address[BYTES_IN_WORD]; /* offset of of data to relocate */ | |
166 | bfd_byte r_index[3]; /* symbol table index of symbol */ | |
167 | bfd_byte r_type[1]; /* relocation type */ | |
168 | }; | |
169 | ||
170 | #define RELOC_STD_BITS_PCREL_BIG 0x80 | |
171 | #define RELOC_STD_BITS_PCREL_LITTLE 0x01 | |
172 | ||
173 | #define RELOC_STD_BITS_LENGTH_BIG 0x60 | |
174 | #define RELOC_STD_BITS_LENGTH_SH_BIG 5 /* To shift to units place */ | |
175 | #define RELOC_STD_BITS_LENGTH_LITTLE 0x06 | |
176 | #define RELOC_STD_BITS_LENGTH_SH_LITTLE 1 | |
177 | ||
178 | #define RELOC_STD_BITS_EXTERN_BIG 0x10 | |
179 | #define RELOC_STD_BITS_EXTERN_LITTLE 0x08 | |
180 | ||
181 | #define RELOC_STD_BITS_BASEREL_BIG 0x08 | |
182 | #define RELOC_STD_BITS_BASEREL_LITTLE 0x08 | |
183 | ||
184 | #define RELOC_STD_BITS_JMPTABLE_BIG 0x04 | |
185 | #define RELOC_STD_BITS_JMPTABLE_LITTLE 0x04 | |
186 | ||
187 | #define RELOC_STD_BITS_RELATIVE_BIG 0x02 | |
188 | #define RELOC_STD_BITS_RELATIVE_LITTLE 0x02 | |
189 | ||
190 | #define RELOC_STD_SIZE (BYTES_IN_WORD + 3 + 1) /* Bytes per relocation entry */ | |
191 | ||
192 | struct reloc_std_internal | |
193 | { | |
194 | bfd_vma r_address; /* Address (within segment) to be relocated. */ | |
195 | /* The meaning of r_symbolnum depends on r_extern. */ | |
196 | unsigned int r_symbolnum:24; | |
197 | /* Nonzero means value is a pc-relative offset | |
198 | and it should be relocated for changes in its own address | |
199 | as well as for changes in the symbol or section specified. */ | |
200 | unsigned int r_pcrel:1; | |
201 | /* Length (as exponent of 2) of the field to be relocated. | |
202 | Thus, a value of 2 indicates 1<<2 bytes. */ | |
203 | unsigned int r_length:2; | |
204 | /* 1 => relocate with value of symbol. | |
205 | r_symbolnum is the index of the symbol | |
206 | in files the symbol table. | |
207 | 0 => relocate with the address of a segment. | |
208 | r_symbolnum is N_TEXT, N_DATA, N_BSS or N_ABS | |
209 | (the N_EXT bit may be set also, but signifies nothing). */ | |
210 | unsigned int r_extern:1; | |
211 | /* The next three bits are for SunOS shared libraries, and seem to | |
212 | be undocumented. */ | |
213 | unsigned int r_baserel:1; /* Linkage table relative */ | |
214 | unsigned int r_jmptable:1; /* pc-relative to jump table */ | |
215 | unsigned int r_relative:1; /* "relative relocation" */ | |
216 | /* unused */ | |
217 | unsigned int r_pad:1; /* Padding -- set to zero */ | |
218 | }; | |
219 | ||
220 | ||
221 | /* EXTENDED RELOCS */ | |
222 | ||
223 | struct reloc_ext_external { | |
224 | bfd_byte r_address[BYTES_IN_WORD]; /* offset of of data to relocate */ | |
225 | bfd_byte r_index[3]; /* symbol table index of symbol */ | |
226 | bfd_byte r_type[1]; /* relocation type */ | |
227 | bfd_byte r_addend[BYTES_IN_WORD]; /* datum addend */ | |
228 | }; | |
229 | ||
230 | #define RELOC_EXT_BITS_EXTERN_BIG 0x80 | |
231 | #define RELOC_EXT_BITS_EXTERN_LITTLE 0x01 | |
232 | ||
233 | #define RELOC_EXT_BITS_TYPE_BIG 0x1F | |
234 | #define RELOC_EXT_BITS_TYPE_SH_BIG 0 | |
235 | #define RELOC_EXT_BITS_TYPE_LITTLE 0xF8 | |
236 | #define RELOC_EXT_BITS_TYPE_SH_LITTLE 3 | |
237 | ||
238 | /* Bytes per relocation entry */ | |
239 | #define RELOC_EXT_SIZE (BYTES_IN_WORD + 3 + 1 + BYTES_IN_WORD) | |
240 | ||
241 | enum reloc_type | |
242 | { | |
243 | /* simple relocations */ | |
244 | RELOC_8, /* data[0:7] = addend + sv */ | |
245 | RELOC_16, /* data[0:15] = addend + sv */ | |
246 | RELOC_32, /* data[0:31] = addend + sv */ | |
247 | /* pc-rel displacement */ | |
248 | RELOC_DISP8, /* data[0:7] = addend - pc + sv */ | |
249 | RELOC_DISP16, /* data[0:15] = addend - pc + sv */ | |
250 | RELOC_DISP32, /* data[0:31] = addend - pc + sv */ | |
251 | /* Special */ | |
252 | RELOC_WDISP30, /* data[0:29] = (addend + sv - pc)>>2 */ | |
253 | RELOC_WDISP22, /* data[0:21] = (addend + sv - pc)>>2 */ | |
254 | RELOC_HI22, /* data[0:21] = (addend + sv)>>10 */ | |
255 | RELOC_22, /* data[0:21] = (addend + sv) */ | |
256 | RELOC_13, /* data[0:12] = (addend + sv) */ | |
257 | RELOC_LO10, /* data[0:9] = (addend + sv) */ | |
258 | RELOC_SFA_BASE, | |
259 | RELOC_SFA_OFF13, | |
260 | /* P.I.C. (base-relative) */ | |
261 | RELOC_BASE10, /* Not sure - maybe we can do this the */ | |
262 | RELOC_BASE13, /* right way now */ | |
263 | RELOC_BASE22, | |
264 | /* for some sort of pc-rel P.I.C. (?) */ | |
265 | RELOC_PC10, | |
266 | RELOC_PC22, | |
267 | /* P.I.C. jump table */ | |
268 | RELOC_JMP_TBL, | |
269 | /* reputedly for shared libraries somehow */ | |
270 | RELOC_SEGOFF16, | |
271 | RELOC_GLOB_DAT, | |
272 | RELOC_JMP_SLOT, | |
273 | RELOC_RELATIVE, | |
274 | ||
275 | RELOC_11, | |
276 | RELOC_WDISP2_14, | |
277 | RELOC_WDISP19, | |
278 | RELOC_HHI22, /* data[0:21] = (addend + sv) >> 42 */ | |
279 | RELOC_HLO10, /* data[0:9] = (addend + sv) >> 32 */ | |
280 | ||
281 | /* 29K relocation types */ | |
282 | RELOC_JUMPTARG, | |
283 | RELOC_CONST, | |
284 | RELOC_CONSTH, | |
285 | ||
286 | NO_RELOC | |
287 | }; | |
288 | ||
289 | ||
290 | struct reloc_internal { | |
291 | bfd_vma r_address; /* offset of of data to relocate */ | |
292 | long r_index; /* symbol table index of symbol */ | |
293 | enum reloc_type r_type; /* relocation type */ | |
294 | bfd_vma r_addend; /* datum addend */ | |
295 | }; | |
296 | ||
297 | #endif /* __A_OUT_ADOBE_H__ */ |