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comparison gcc/config/vxworks.c @ 0:a06113de4d67

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author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
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-1:000000000000 0:a06113de4d67
1 /* Common VxWorks target definitions for GNU compiler.
2 Copyright (C) 2007, 2008
3 Free Software Foundation, Inc.
4 Contributed by CodeSourcery, Inc.
5
6 This file is part of GCC.
7
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
11 version.
12
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
21
22 #include "config.h"
23 #include "system.h"
24 #include "coretypes.h"
25 #include "target.h"
26 #include "toplev.h"
27 #include "output.h"
28 #include "tm.h"
29 #include "tree.h"
30
31 /* Like default_named_section_asm_out_constructor, except that even
32 constructors with DEFAULT_INIT_PRIORITY must go in a numbered
33 section on VxWorks. The VxWorks runtime uses a clever trick to get
34 the sentinel entry (-1) inserted at the beginning of the .ctors
35 segment. This trick will not work if we ever generate any entries
36 in plain .ctors sections; we must always use .ctors.PRIORITY. */
37
38 void
39 vxworks_asm_out_constructor (rtx symbol, int priority)
40 {
41 section *sec;
42
43 sec = get_cdtor_priority_section (priority,
44 /*constructor_p=*/true);
45 assemble_addr_to_section (symbol, sec);
46 }
47
48 /* See comment for vxworks_asm_out_constructor. */
49
50 void
51 vxworks_asm_out_destructor (rtx symbol, int priority)
52 {
53 section *sec;
54
55 sec = get_cdtor_priority_section (priority,
56 /*constructor_p=*/false);
57 assemble_addr_to_section (symbol, sec);
58 }
59
60 /* Return the list of FIELD_DECLs that make up an emulated TLS
61 variable's control object. TYPE is the structure these are fields
62 of and *NAME will be filled in with the structure tag that should
63 be used. */
64
65 static tree
66 vxworks_emutls_var_fields (tree type, tree *name)
67 {
68 tree field, next_field;
69
70 *name = get_identifier ("__tls_var");
71
72 field = build_decl (FIELD_DECL, get_identifier ("size"),
73 unsigned_type_node);
74 DECL_CONTEXT (field) = type;
75 next_field = field;
76
77 field = build_decl (FIELD_DECL, get_identifier ("module_id"),
78 unsigned_type_node);
79 DECL_CONTEXT (field) = type;
80 TREE_CHAIN (field) = next_field;
81 next_field = field;
82
83 field = build_decl (FIELD_DECL, get_identifier ("offset"),
84 unsigned_type_node);
85 DECL_CONTEXT (field) = type;
86 TREE_CHAIN (field) = next_field;
87
88 return field;
89 }
90
91 /* Return the CONSTRUCTOR to initialize an emulated TLS control
92 object. VAR is the control object. DECL is the TLS object itself
93 and TMPL_ADDR is the address (an ADDR_EXPR) of the initializer for
94 that object. */
95
96 static tree
97 vxworks_emutls_var_init (tree var, tree decl, tree tmpl_addr)
98 {
99 VEC(constructor_elt,gc) *v = VEC_alloc (constructor_elt, gc, 3);
100 constructor_elt *elt;
101
102 tree type = TREE_TYPE (var);
103 tree field = TYPE_FIELDS (type);
104
105 elt = VEC_quick_push (constructor_elt, v, NULL);
106 elt->index = field;
107 elt->value = fold_convert (TREE_TYPE (field), tmpl_addr);
108
109 elt = VEC_quick_push (constructor_elt, v, NULL);
110 field = TREE_CHAIN (field);
111 elt->index = field;
112 elt->value = build_int_cst (TREE_TYPE (field), 0);
113
114 elt = VEC_quick_push (constructor_elt, v, NULL);
115 field = TREE_CHAIN (field);
116 elt->index = field;
117 elt->value = fold_convert (TREE_TYPE (field), DECL_SIZE_UNIT (decl));
118
119 return build_constructor (type, v);
120 }
121
122 /* Do VxWorks-specific parts of OVERRIDE_OPTIONS. */
123
124 void
125 vxworks_override_options (void)
126 {
127 /* We don't support __thread via target hooks. */
128 targetm.have_tls = false;
129
130 targetm.emutls.get_address = "__builtin___tls_lookup";
131 targetm.emutls.register_common = NULL;
132 targetm.emutls.var_section = ".tls_vars";
133 targetm.emutls.tmpl_section = ".tls_data";
134 targetm.emutls.var_prefix = "__tls__";
135 targetm.emutls.tmpl_prefix = "";
136 targetm.emutls.var_fields = vxworks_emutls_var_fields;
137 targetm.emutls.var_init = vxworks_emutls_var_init;
138 targetm.emutls.var_align_fixed = true;
139 targetm.emutls.debug_form_tls_address = true;
140
141 /* We can use .ctors/.dtors sections only in RTP mode. */
142 targetm.have_ctors_dtors = TARGET_VXWORKS_RTP;
143
144 /* PIC is only supported for RTPs. */
145 if (flag_pic && !TARGET_VXWORKS_RTP)
146 error ("PIC is only supported for RTPs");
147 }