1 /* ELF object file format.
2    Copyright (C) 1992-2016 Free Software Foundation, Inc.
3 
4    This file is part of GAS, the GNU Assembler.
5 
6    GAS is free software; you can redistribute it and/or modify
7    it under the terms of the GNU General Public License as published by
8    the Free Software Foundation; either version 3, or (at your option)
9    any later version.
10 
11    GAS is distributed in the hope that it will be useful,
12    but WITHOUT ANY WARRANTY; without even the implied warranty of
13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14    GNU General Public License for more details.
15 
16    You should have received a copy of the GNU General Public License
17    along with GAS; see the file COPYING.  If not, write to the Free
18    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
19    02110-1301, USA.  */
20 
21 /* HP PA-RISC support was contributed by the Center for Software Science
22    at the University of Utah.  */
23 
24 #ifndef _OBJ_ELF_H
25 #define _OBJ_ELF_H
26 
27 #define OBJ_ELF 1
28 
29 /* Note that all macros in this file should be wrapped in #ifndef, for
30    sake of obj-multi.h which includes this file.  */
31 
32 #ifndef OUTPUT_FLAVOR
33 #define OUTPUT_FLAVOR bfd_target_elf_flavour
34 #endif
35 
36 #define BYTES_IN_WORD 4		/* for now */
37 #include "bfd/elf-bfd.h"
38 
39 #include "targ-cpu.h"
40 
41 #ifdef TC_ALPHA
42 #define ECOFF_DEBUGGING (alpha_flag_mdebug > 0)
43 extern int alpha_flag_mdebug;
44 #endif
45 
46 /* For now, always set ECOFF_DEBUGGING for a MIPS target.  */
47 #ifdef TC_MIPS
48 #define ECOFF_DEBUGGING mips_flag_mdebug
49 extern int mips_flag_mdebug;
50 #endif /* TC_MIPS */
51 
52 #ifdef OBJ_MAYBE_ECOFF
53 #ifndef ECOFF_DEBUGGING
54 #define ECOFF_DEBUGGING 1
55 #endif
56 #endif
57 
58 /* Additional information we keep for each symbol.  */
59 struct elf_obj_sy
60 {
61   /* Whether the symbol has been marked as local.  */
62   int local;
63 
64   /* Use this to keep track of .size expressions that involve
65      differences that we can't compute yet.  */
66   expressionS *size;
67 
68   /* The name specified by the .symver directive.  */
69   char *versioned_name;
70 
71 #ifdef ECOFF_DEBUGGING
72   /* If we are generating ECOFF debugging information, we need some
73      additional fields for each symbol.  */
74   struct efdr *ecoff_file;
75   struct localsym *ecoff_symbol;
76   valueT ecoff_extern_size;
77 #endif
78 };
79 
80 #define OBJ_SYMFIELD_TYPE struct elf_obj_sy
81 
82 #ifndef FALSE
83 #define FALSE 0
84 #define TRUE  !FALSE
85 #endif
86 
87 #ifndef obj_begin
88 #define obj_begin() elf_begin ()
89 #endif
90 extern void elf_begin (void);
91 
92 #ifndef LOCAL_LABEL_PREFIX
93 #define LOCAL_LABEL_PREFIX '.'
94 #endif
95 
96 /* should be conditional on address size! */
97 #define elf_symbol(asymbol) ((elf_symbol_type *) (&(asymbol)->the_bfd))
98 
99 #ifndef S_GET_SIZE
100 #define S_GET_SIZE(S) \
101   (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_size)
102 #endif
103 #ifndef S_SET_SIZE
104 #define S_SET_SIZE(S,V) \
105   (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_size = (V))
106 #endif
107 
108 #ifndef S_GET_ALIGN
109 #define S_GET_ALIGN(S) \
110   (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_value)
111 #endif
112 #ifndef S_SET_ALIGN
113 #define S_SET_ALIGN(S,V) \
114   (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_value = (V))
115 #endif
116 
117 int elf_s_get_other (symbolS *);
118 #ifndef S_GET_OTHER
119 #define S_GET_OTHER(S)	(elf_s_get_other (S))
120 #endif
121 #ifndef S_SET_OTHER
122 #define S_SET_OTHER(S,V) \
123   (elf_symbol (symbol_get_bfdsym (S))->internal_elf_sym.st_other = (V))
124 #endif
125 
126 extern asection *gdb_section;
127 
128 #ifndef obj_frob_file
129 #define obj_frob_file  elf_frob_file
130 #endif
131 extern void elf_frob_file (void);
132 
133 #ifndef obj_frob_file_before_adjust
134 #define obj_frob_file_before_adjust  elf_frob_file_before_adjust
135 #endif
136 extern void elf_frob_file_before_adjust (void);
137 
138 #ifndef obj_frob_file_after_relocs
139 #define obj_frob_file_after_relocs  elf_frob_file_after_relocs
140 #endif
141 extern void elf_frob_file_after_relocs (void);
142 
143 /* If the target doesn't have special processing for labels, take care of
144    dwarf2 output at the object file level.  */
145 #ifndef tc_frob_label
146 #include "dwarf2dbg.h"
147 #define obj_frob_label  dwarf2_emit_label
148 #endif
149 
150 #ifndef obj_app_file
151 #define obj_app_file elf_file_symbol
152 #endif
153 extern void elf_file_symbol (const char *, int);
154 
155 extern void obj_elf_section_change_hook (void);
156 
157 extern void obj_elf_section (int);
158 extern const char * obj_elf_section_name (void);
159 extern void obj_elf_previous (int);
160 extern void obj_elf_version (int);
161 extern void obj_elf_common (int);
162 extern void obj_elf_data (int);
163 extern void obj_elf_text (int);
164 extern void obj_elf_change_section
165   (const char *, unsigned int, bfd_vma, int, const char *, int, int);
166 extern struct fix *obj_elf_vtable_inherit (int);
167 extern struct fix *obj_elf_vtable_entry (int);
168 extern bfd_boolean obj_elf_seen_attribute
169   (int, unsigned int);
170 extern int obj_elf_vendor_attribute (int);
171 
172 /* BFD wants to write the udata field, which is a no-no for the
173    predefined section symbols in bfd/section.c.  They are read-only.  */
174 #ifndef obj_sec_sym_ok_for_reloc
175 #define obj_sec_sym_ok_for_reloc(SEC)	((SEC)->owner != 0)
176 #endif
177 
178 void elf_obj_read_begin_hook (void);
179 #ifndef obj_read_begin_hook
180 #define obj_read_begin_hook	elf_obj_read_begin_hook
181 #endif
182 
183 void elf_obj_symbol_new_hook (symbolS *);
184 #ifndef obj_symbol_new_hook
185 #define obj_symbol_new_hook	elf_obj_symbol_new_hook
186 #endif
187 
188 void elf_copy_symbol_attributes (symbolS *, symbolS *);
189 #ifndef OBJ_COPY_SYMBOL_ATTRIBUTES
190 #define OBJ_COPY_SYMBOL_ATTRIBUTES(DEST, SRC) \
191   (elf_copy_symbol_attributes (DEST, SRC))
192 #endif
193 
194 void elf_adjust_symtab (void);
195 #ifndef obj_adjust_symtab
196 #define obj_adjust_symtab	elf_adjust_symtab
197 #endif
198 
199 #ifndef SEPARATE_STAB_SECTIONS
200 /* Avoid ifndef each separate macro setting by wrapping the whole of the
201    stab group on the assumption that whoever sets SEPARATE_STAB_SECTIONS
202    caters to ECOFF_DEBUGGING and the right setting of INIT_STAB_SECTIONS
203    and OBJ_PROCESS_STAB too, without needing the tweaks below.  */
204 
205 /* Stabs go in a separate section.  */
206 #define SEPARATE_STAB_SECTIONS 1
207 
208 /* We need 12 bytes at the start of the section to hold some initial
209    information.  */
210 extern void obj_elf_init_stab_section (segT);
211 #define INIT_STAB_SECTION(seg) obj_elf_init_stab_section (seg)
212 
213 #ifdef ECOFF_DEBUGGING
214 /* We smuggle stabs in ECOFF rather than using a separate section.
215    The Irix linker can not handle a separate stabs section.  */
216 
217 #undef  SEPARATE_STAB_SECTIONS
218 #define SEPARATE_STAB_SECTIONS (!ECOFF_DEBUGGING)
219 
220 #undef  INIT_STAB_SECTION
221 #define INIT_STAB_SECTION(seg) \
222   ((void) (ECOFF_DEBUGGING ? 0 : (obj_elf_init_stab_section (seg), 0)))
223 
224 #undef OBJ_PROCESS_STAB
225 #define OBJ_PROCESS_STAB(seg, what, string, type, other, desc)		\
226   if (ECOFF_DEBUGGING)							\
227     ecoff_stab ((seg), (what), (string), (type), (other), (desc))
228 #endif /* ECOFF_DEBUGGING */
229 
230 #endif /* SEPARATE_STAB_SECTIONS not defined.  */
231 
232 extern void elf_frob_symbol (symbolS *, int *);
233 #ifndef obj_frob_symbol
234 #define obj_frob_symbol(symp, punt) elf_frob_symbol (symp, &punt)
235 #endif
236 
237 extern void elf_pop_insert (void);
238 #ifndef obj_pop_insert
239 #define obj_pop_insert()	elf_pop_insert()
240 #endif
241 
242 #ifndef OBJ_MAYBE_ELF
243 /* If OBJ_MAYBE_ELF then obj-multi.h will define obj_ecoff_set_ext.  */
244 #define obj_ecoff_set_ext elf_ecoff_set_ext
245 struct ecoff_extr;
246 extern void elf_ecoff_set_ext (symbolS *, struct ecoff_extr *);
247 #endif
248 extern asection *elf_com_section_ptr;
249 extern symbolS * elf_common_parse (int ignore ATTRIBUTE_UNUSED, symbolS *symbolP,
250 				   addressT size);
251 
252 #endif /* _OBJ_ELF_H */
253