1 /* Mach-O object file format
2 Copyright 2009 Free Software Foundation, Inc.
4 This file is part of GAS, the GNU Assembler.
6 GAS is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as
8 published by the Free Software Foundation; either version 3,
9 or (at your option) any later version.
11 GAS is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
14 the GNU General Public License for more details.
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
21 #define OBJ_HEADER "obj-macho.h"
28 #include "mach-o/loader.h"
31 obj_mach_o_weak (int ignore ATTRIBUTE_UNUSED)
39 /* Get symbol name. */
40 name = input_line_pointer;
41 c = get_symbol_end ();
42 symbolP = symbol_find_or_make (name);
44 *input_line_pointer = c;
52 while (*input_line_pointer != '\n');
53 demand_empty_rest_of_line ();
57 .section segname,sectname[,type[,attribute[,sizeof_stub]]]
61 obj_mach_o_section (int ignore ATTRIBUTE_UNUSED)
67 int sectype = BFD_MACH_O_S_REGULAR;
68 unsigned int secattr = 0;
69 offsetT sizeof_stub = 0;
71 flagword oldflags, flags;
74 /* Parse segment name. */
75 if (!is_name_beginner (*input_line_pointer))
77 as_bad (_("missing segment name"));
78 ignore_rest_of_line ();
81 p = input_line_pointer;
82 c = get_symbol_end ();
83 segname = alloca (input_line_pointer - p + 1);
85 *input_line_pointer = c;
87 if (*input_line_pointer != ',')
89 as_bad (_("missing comma after segment name"));
90 ignore_rest_of_line ();
95 /* Parse section name. */
96 if (!is_name_beginner (*input_line_pointer))
98 as_bad (_("missing section name"));
99 ignore_rest_of_line ();
102 p = input_line_pointer;
103 c = get_symbol_end ();
104 sectname = alloca (input_line_pointer - p + 1);
105 strcpy (sectname, p);
106 *input_line_pointer = c;
109 if (*input_line_pointer == ',')
111 input_line_pointer++;
112 if (!is_name_beginner (*input_line_pointer))
114 as_bad (_("missing section type name"));
115 ignore_rest_of_line ();
118 p = input_line_pointer;
119 c = get_symbol_end ();
121 sectype = bfd_mach_o_get_section_type_from_name (p);
124 as_bad (_("unknown or invalid section type '%s'"), p);
125 sectype = BFD_MACH_O_S_REGULAR;
127 *input_line_pointer = c;
129 /* Parse attributes. */
130 if (*input_line_pointer == ',')
136 input_line_pointer++;
138 if (!is_name_beginner (*input_line_pointer))
140 as_bad (_("missing section attribute identifier"));
141 ignore_rest_of_line ();
144 p = input_line_pointer;
145 c = get_symbol_end ();
147 attr = bfd_mach_o_get_section_attribute_from_name (p);
149 as_bad (_("unknown or invalid section attribute '%s'"), p);
153 *input_line_pointer = c;
155 while (*input_line_pointer == '+');
157 /* Parse sizeof_stub. */
158 if (*input_line_pointer == ',')
160 if (sectype != BFD_MACH_O_S_SYMBOL_STUBS)
161 as_bad (_("unexpected sizeof_stub expression"));
163 sizeof_stub = get_absolute_expression ();
165 else if (sectype == BFD_MACH_O_S_SYMBOL_STUBS)
166 as_bad (_("missing sizeof_stub expression"));
169 demand_empty_rest_of_line ();
171 bfd_mach_o_normalize_section_name (segname, sectname, &name, &flags);
174 /* There is no normal BFD section name for this section. Create one.
175 The name created doesn't really matter as it will never be written
177 size_t seglen = strlen (segname);
178 size_t sectlen = strlen (sectname);
181 n = xmalloc (seglen + 1 + sectlen + 1);
182 memcpy (n, segname, seglen);
184 memcpy (n + seglen + 1, sectname, sectlen);
185 n[seglen + 1 + sectlen] = 0;
189 #ifdef md_flush_pending_output
190 md_flush_pending_output ();
193 /* Sub-segments don't exists as is on Mach-O. */
194 sec = subseg_new (name, 0);
196 oldflags = bfd_get_section_flags (stdoutput, sec);
197 if (oldflags == SEC_NO_FLAGS)
199 bfd_mach_o_section *msect;
201 if (! bfd_set_section_flags (stdoutput, sec, flags))
202 as_warn (_("error setting flags for \"%s\": %s"),
203 bfd_section_name (stdoutput, sec),
204 bfd_errmsg (bfd_get_error ()));
205 msect = bfd_mach_o_get_mach_o_section (sec);
206 strncpy (msect->segname, segname, sizeof (msect->segname));
207 msect->segname[16] = 0;
208 strncpy (msect->sectname, sectname, sizeof (msect->sectname));
209 msect->sectname[16] = 0;
210 msect->flags = secattr | sectype;
211 msect->reserved2 = sizeof_stub;
213 else if (flags != SEC_NO_FLAGS)
215 if (flags != oldflags)
216 as_warn (_("Ignoring changed section attributes for %s"), name);
226 static const struct known_section known_sections[] =
229 /* 1 */ { ".cstring", BFD_MACH_O_S_CSTRING_LITERALS }
233 obj_mach_o_known_section (int sect_index)
235 const struct known_section *sect = &known_sections[sect_index];
239 #ifdef md_flush_pending_output
240 md_flush_pending_output ();
243 old_sec = bfd_get_section_by_name (stdoutput, sect->name);
246 /* Section already present. */
252 bfd_mach_o_section *msect;
254 sec = subseg_force_new (sect->name, 0);
256 /* Set default flags. */
257 msect = bfd_mach_o_get_mach_o_section (sec);
258 msect->flags = sect->flags;
262 /* Called from read.c:s_comm after we've parsed .comm symbol, size.
263 Parse a possible alignment value. */
266 obj_mach_o_common_parse (int ignore ATTRIBUTE_UNUSED,
267 symbolS *symbolP, addressT size)
271 if (*input_line_pointer == ',')
273 align = parse_align (0);
274 if (align == (addressT) -1)
278 S_SET_VALUE (symbolP, size);
279 S_SET_EXTERNAL (symbolP);
280 S_SET_SEGMENT (symbolP, bfd_com_section_ptr);
282 symbol_get_bfdsym (symbolP)->flags |= BSF_OBJECT;
288 obj_mach_o_comm (int ignore ATTRIBUTE_UNUSED)
290 s_comm_internal (ignore, obj_mach_o_common_parse);
294 obj_mach_o_subsections_via_symbols (int arg ATTRIBUTE_UNUSED)
296 /* Currently ignore it. */
297 demand_empty_rest_of_line ();
300 const pseudo_typeS mach_o_pseudo_table[] =
302 { "weak", obj_mach_o_weak, 0},
303 { "section", obj_mach_o_section, 0},
304 { "cstring", obj_mach_o_known_section, 1},
305 { "lcomm", s_lcomm, 1 },
306 { "comm", obj_mach_o_comm, 0 },
307 { "subsections_via_symbols", obj_mach_o_subsections_via_symbols, 0 },