1 #ifndef __A_OUT_GNU_H__
2 #define __A_OUT_GNU_H__
6 #define __GNU_EXEC_MACROS__
8 #ifndef __STRUCT_EXEC_OVERRIDE__
10 /* This is the layout on disk of a Unix V7, Berkeley, SunOS, Vax Ultrix
11 "struct exec". Don't assume that on this machine, the "struct exec"
12 will lay out the same sizes or alignments. */
15 unsigned char a_info
[4];
16 unsigned char a_text
[4];
17 unsigned char a_data
[4];
18 unsigned char a_bss
[4];
19 unsigned char a_syms
[4];
20 unsigned char a_entry
[4];
21 unsigned char a_trsize
[4];
22 unsigned char a_drsize
[4];
25 /* How big the "struct exec" is on disk */
26 #define EXEC_BYTES_SIZE (8 * 4)
28 /* This is the layout in memory of a "struct exec" while we process it. */
32 unsigned long a_info
; /* Use macros N_MAGIC, etc for access */
33 unsigned a_text
; /* length of text, in bytes */
34 unsigned a_data
; /* length of data, in bytes */
35 unsigned a_bss
; /* length of uninitialized data area for file, in bytes */
36 unsigned a_syms
; /* length of symbol table data in file, in bytes */
37 unsigned a_entry
; /* start address */
38 unsigned a_trsize
; /* length of relocation info for text, in bytes */
39 unsigned a_drsize
; /* length of relocation info for data, in bytes */
42 #endif /* __STRUCT_EXEC_OVERRIDE__ */
44 /* these go in the N_MACHTYPE field */
45 /* These symbols could be defined by code from Suns...punt 'em */
55 /* skip a bunch so we don't run into any of sun's numbers */
59 M_HP200
= 200, /* hp200 (68010) BSD binary */
60 M_HP300
= 300, /* hp300 (68020+68881) BSD binary */
61 M_HPUX23
= 0x020C, /* hp200/300 HPUX binary */
64 #define N_MAGIC(exec) ((exec).a_info & 0xffff)
65 #define N_MACHTYPE(exec) ((enum machine_type)(((exec).a_info >> 16) & 0xff))
66 #define N_FLAGS(exec) (((exec).a_info >> 24) & 0xff)
67 #define N_SET_INFO(exec, magic, type, flags) \
68 ((exec).a_info = ((magic) & 0xffff) \
69 | (((int)(type) & 0xff) << 16) \
70 | (((flags) & 0xff) << 24))
71 #define N_SET_MAGIC(exec, magic) \
72 ((exec).a_info = (((exec).a_info & 0xffff0000) | ((magic) & 0xffff)))
74 #define N_SET_MACHTYPE(exec, machtype) \
76 ((exec).a_info&0xff00ffff) | ((((int)(machtype))&0xff) << 16))
78 #define N_SET_FLAGS(exec, flags) \
80 ((exec).a_info&0x00ffffff) | (((flags) & 0xff) << 24))
82 /* Code indicating object file or impure executable. */
84 /* Code indicating pure executable. */
86 /* Code indicating demand-paged executable. */
89 /* Virtual Address of text segment from the a.out file. For OMAGIC,
90 (almost always "unlinked .o's" these days), should be zero.
91 For linked files, should reflect reality if we know it. */
94 #define N_TXTADDR(x) (N_MAGIC(x)==OMAGIC? 0 : TEXT_START_ADDR)
98 #define N_BADMAG(x) (N_MAGIC(x) != OMAGIC \
99 && N_MAGIC(x) != NMAGIC \
100 && N_MAGIC(x) != ZMAGIC)
103 /* By default, segment size is constant. But on some machines, it can
104 be a function of the a.out header (e.g. machine type). */
106 #define N_SEGSIZE(x) SEGMENT_SIZE
109 /* This complexity is for encapsulated COFF support */
111 #define _N_HDROFF(x) (N_SEGSIZE(x) - sizeof (struct exec))
115 #define N_TXTOFF(x) (N_MAGIC(x) == ZMAGIC ? \
116 _N_HDROFF((x)) + sizeof (struct exec) : \
117 sizeof (struct exec))
122 #define N_DATOFF(x) ( N_TXTOFF(x) + (x).a_text )
126 #define N_TRELOFF(x) ( N_DATOFF(x) + (x).a_data )
130 #define N_DRELOFF(x) ( N_TRELOFF(x) + (x).a_trsize )
134 #define N_SYMOFF(x) ( N_DRELOFF(x) + (x).a_drsize )
138 #define N_STROFF(x) ( N_SYMOFF(x) + (x).a_syms )
141 /* Address of text segment in memory after it is loaded. */
143 #define N_TXTADDR(x) 0
147 #define N_DATADDR(x) \
148 (N_MAGIC(x)==OMAGIC? (N_TXTADDR(x)+(x).a_text) \
149 : (N_SEGSIZE(x) + ((N_TXTADDR(x)+(x).a_text-1) & ~(N_SEGSIZE(x)-1))))
152 /* Address of bss segment in memory after it is loaded. */
153 #define N_BSSADDR(x) (N_DATADDR(x) + (x).a_data)
158 struct nlist
*n_next
;
161 unsigned char n_type
;
164 unsigned long n_value
;
172 #define N_COMM 0x12 /* common (visible in shared lib commons) */
173 #define N_FN 0x1F /* File name of a .o file */
175 /* Note: N_EXT can only usefully be OR-ed with N_UNDF, N_ABS, N_TEXT,
176 N_DATA, or N_BSS. When the low-order bit of other types is set,
177 (e.g. N_WARNING versus N_FN), they are two different types. */
182 /* The following type indicates the definition of a symbol as being
183 an indirect reference to another symbol. The other symbol
184 appears as an undefined reference, immediately following this symbol.
186 Indirection is asymmetrical. The other symbol's value will be used
187 to satisfy requests for the indirect symbol, but not vice versa.
188 If the other symbol does not have a definition, libraries will
189 be searched to find a definition. */
193 /* The following symbols refer to set elements.
194 All the N_SET[ATDB] symbols with the same name form one set.
195 Space is allocated for the set in the text section, and each set
196 element's value is stored into one word of the space.
197 The first word of the space is the length of the set (number of elements).
199 The address of the set is made into an N_SETV symbol
200 whose name is the same as the name of the set.
201 This symbol acts like a N_DATA global symbol
202 in that it can satisfy undefined external references. */
204 /* These appear as input to LD, in a .o file. */
205 #define N_SETA 0x14 /* Absolute set element symbol */
206 #define N_SETT 0x16 /* Text set element symbol */
207 #define N_SETD 0x18 /* Data set element symbol */
208 #define N_SETB 0x1A /* Bss set element symbol */
210 /* This is output from LD. */
211 #define N_SETV 0x1C /* Pointer to set vector in data area. */
213 /* Warning symbol. The text gives a warning message, the next symbol
214 in the table will be undefined. When the symbol is referenced, the
215 message is printed. */
217 #define N_WARNING 0x1e
219 /* This structure describes a single relocation to be performed.
220 The text-relocation section of the file is a vector of these structures,
221 all of which apply to the text section.
222 Likewise, the data-relocation section applies to the data section. */
224 /* The following enum and struct were borrowed from SunOS's
225 /usr/include/sun4/a.out.h and extended to handle
226 other machines. It is currently used on SPARC and AMD 29000.
228 reloc_ext_bytes is how it looks on disk. reloc_info_extended is
229 how we might process it on a native host. */
231 struct reloc_ext_bytes
{
232 unsigned char r_address
[4];
233 unsigned char r_index
[3];
234 unsigned char r_bits
[1];
235 unsigned char r_addend
[4];
238 #define RELOC_EXT_BITS_EXTERN_BIG 0x80
239 #define RELOC_EXT_BITS_EXTERN_LITTLE 0x01
241 #define RELOC_EXT_BITS_TYPE_BIG 0x1F
242 #define RELOC_EXT_BITS_TYPE_SH_BIG 0
243 #define RELOC_EXT_BITS_TYPE_LITTLE 0xF8
244 #define RELOC_EXT_BITS_TYPE_SH_LITTLE 3
246 #define RELOC_EXT_SIZE 12 /* Bytes per relocation entry */
248 struct reloc_info_extended
250 unsigned long r_address
;
251 unsigned int r_index
:24;
252 # define r_symbolnum r_index
255 enum reloc_type r_type
:5;
259 /* The standard, old-fashioned, Berkeley compatible relocation struct */
261 struct reloc_std_bytes
{
262 unsigned char r_address
[4];
263 unsigned char r_index
[3];
264 unsigned char r_bits
[1];
267 #define RELOC_STD_BITS_PCREL_BIG 0x80
268 #define RELOC_STD_BITS_PCREL_LITTLE 0x01
270 #define RELOC_STD_BITS_LENGTH_BIG 0x60
271 #define RELOC_STD_BITS_LENGTH_SH_BIG 5 /* To shift to units place */
272 #define RELOC_STD_BITS_LENGTH_LITTLE 0x06
273 #define RELOC_STD_BITS_LENGTH_SH_LITTLE 1
275 #define RELOC_STD_BITS_EXTERN_BIG 0x10
276 #define RELOC_STD_BITS_EXTERN_LITTLE 0x08
278 #define RELOC_STD_BITS_BASEREL_BIG 0x08
279 #define RELOC_STD_BITS_BASEREL_LITTLE 0x08
281 #define RELOC_STD_BITS_JMPTABLE_BIG 0x04
282 #define RELOC_STD_BITS_JMPTABLE_LITTLE 0x04
284 #define RELOC_STD_BITS_RELATIVE_BIG 0x02
285 #define RELOC_STD_BITS_RELATIVE_LITTLE 0x02
287 #define RELOC_STD_SIZE 8 /* Bytes per relocation entry */
289 struct relocation_info
291 /* Address (within segment) to be relocated. */
293 /* The meaning of r_symbolnum depends on r_extern. */
294 unsigned int r_symbolnum
:24;
295 /* Nonzero means value is a pc-relative offset
296 and it should be relocated for changes in its own address
297 as well as for changes in the symbol or section specified. */
298 unsigned int r_pcrel
:1;
299 /* Length (as exponent of 2) of the field to be relocated.
300 Thus, a value of 2 indicates 1<<2 bytes. */
301 unsigned int r_length
:2;
302 /* 1 => relocate with value of symbol.
303 r_symbolnum is the index of the symbol
304 in file's the symbol table.
305 0 => relocate with the address of a segment.
306 r_symbolnum is N_TEXT, N_DATA, N_BSS or N_ABS
307 (the N_EXT bit may be set also, but signifies nothing). */
308 unsigned int r_extern
:1;
309 /* The next three bits are for SunOS shared libraries, and seem to
311 unsigned int r_baserel
:1; /* Linkage table relative */
312 unsigned int r_jmptable
:1; /* pc-relative to jump table */
315 #define r_bsr r_baserel
316 #define r_disp r_jmptable
317 #endif /* TC_NS32K */
319 unsigned int r_relative
:1; /* "relative relocation" */
321 unsigned int r_pad
:1; /* Padding -- set to zero */
324 #endif /* __A_OUT_GNU_H__ */
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