1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
/* Common VxWorks target definitions for GNU compiler.
Copyright (C) 2007-2022 Free Software Foundation, Inc.
Contributed by CodeSourcery, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "target.h"
#include "tree.h"
#include "stringpool.h"
#include "diagnostic-core.h"
#include "output.h"
#include "fold-const.h"
#include "rtl.h"
#include "memmodel.h"
#include "optabs.h"
#include "opts.h"
#if !HAVE_INITFINI_ARRAY_SUPPORT
/* Like default_named_section_asm_out_constructor, except that even
constructors with DEFAULT_INIT_PRIORITY must go in a numbered
section on VxWorks. The VxWorks runtime uses a clever trick to get
the sentinel entry (-1) inserted at the beginning of the .ctors
segment. This trick will not work if we ever generate any entries
in plain .ctors sections; we must always use .ctors.PRIORITY. */
void
vxworks_asm_out_constructor (rtx symbol, int priority)
{
section *sec;
sec = get_cdtor_priority_section (priority,
/*constructor_p=*/true);
assemble_addr_to_section (symbol, sec);
}
/* See comment for vxworks_asm_out_constructor. */
void
vxworks_asm_out_destructor (rtx symbol, int priority)
{
section *sec;
sec = get_cdtor_priority_section (priority,
/*constructor_p=*/false);
assemble_addr_to_section (symbol, sec);
}
#endif
/* Return the list of FIELD_DECLs that make up an emulated TLS
variable's control object. TYPE is the structure these are fields
of and *NAME will be filled in with the structure tag that should
be used. */
static tree
vxworks_emutls_var_fields (tree type, tree *name)
{
tree field, next_field;
*name = get_identifier ("__tls_var");
field = build_decl (BUILTINS_LOCATION, FIELD_DECL,
get_identifier ("size"), unsigned_type_node);
DECL_CONTEXT (field) = type;
next_field = field;
field = build_decl (BUILTINS_LOCATION, FIELD_DECL,
get_identifier ("module_id"), unsigned_type_node);
DECL_CONTEXT (field) = type;
DECL_CHAIN (field) = next_field;
next_field = field;
/* The offset field is declared as an unsigned int with pointer mode. */
field = build_decl (BUILTINS_LOCATION, FIELD_DECL,
get_identifier ("offset"), long_unsigned_type_node);
DECL_CONTEXT (field) = type;
DECL_CHAIN (field) = next_field;
return field;
}
/* Return the CONSTRUCTOR to initialize an emulated TLS control
object. VAR is the control object. DECL is the TLS object itself
and TMPL_ADDR is the address (an ADDR_EXPR) of the initializer for
that object. */
static tree
vxworks_emutls_var_init (tree var, tree decl, tree tmpl_addr)
{
vec<constructor_elt, va_gc> *v;
vec_alloc (v, 3);
tree type = TREE_TYPE (var);
tree field = TYPE_FIELDS (type);
constructor_elt elt = {field, fold_convert (TREE_TYPE (field), tmpl_addr)};
v->quick_push (elt);
field = DECL_CHAIN (field);
elt.index = field;
elt.value = build_int_cst (TREE_TYPE (field), 0);
v->quick_push (elt);
field = DECL_CHAIN (field);
elt.index = field;
elt.value = fold_convert (TREE_TYPE (field), DECL_SIZE_UNIT (decl));
v->quick_push (elt);
return build_constructor (type, v);
}
/* Do VxWorks-specific parts of TARGET_OPTION_OVERRIDE. */
void
vxworks_override_options (void)
{
/* Setup the tls emulation bits if the OS misses proper
tls support. */
targetm.have_tls = VXWORKS_HAVE_TLS;
if (!VXWORKS_HAVE_TLS)
{
targetm.emutls.get_address = "__builtin___tls_lookup";
targetm.emutls.register_common = NULL;
targetm.emutls.var_section = ".tls_vars";
targetm.emutls.tmpl_section = ".tls_data";
targetm.emutls.var_prefix = "__tls__";
targetm.emutls.tmpl_prefix = "";
targetm.emutls.var_fields = vxworks_emutls_var_fields;
targetm.emutls.var_init = vxworks_emutls_var_init;
targetm.emutls.var_align_fixed = true;
targetm.emutls.debug_form_tls_address = true;
}
/* Arrange to use .ctors/.dtors sections if the target VxWorks configuration
and mode supports it, or the init/fini_array sections if we were
configured with --enable-initfini-array explicitly. In the latter case,
the toolchain user is expected to provide whatever linker level glue is
required to get things to operate properly. */
targetm.have_ctors_dtors =
TARGET_VXWORKS_HAVE_CTORS_DTORS || HAVE_INITFINI_ARRAY_SUPPORT;
/* PIC is only supported for RTPs. flags_pic might be < 0 here, in
contexts where the corresponding switches are not processed,
e.g. from --help. We are not generating code in such cases. */
if (flag_pic > 0 && !TARGET_VXWORKS_RTP)
error ("PIC is only supported for RTPs");
/* VxWorks comes with non-gdb debuggers which only support strict dwarf
up to certain versions, as controlled by DWARF_VERSION_DEFAULT. */
if (!OPTION_SET_P (dwarf_strict))
dwarf_strict = 1;
}
/* We don't want to use library symbol __clear_cache on SR0640. Avoid
it and issue a direct call to cacheTextUpdate. It takes a size_t
length rather than the END address, so we have to compute it. */
void
vxworks_emit_call_builtin___clear_cache (rtx begin, rtx end)
{
/* STATUS cacheTextUpdate (void *, size_t); */
rtx callee = gen_rtx_SYMBOL_REF (Pmode, "cacheTextUpdate");
enum machine_mode size_mode = TYPE_MODE (sizetype);
rtx len = simplify_gen_binary (MINUS, size_mode, end, begin);
emit_library_call (callee,
LCT_NORMAL, VOIDmode,
begin, ptr_mode,
len, size_mode);
}
|
