OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [config/] [pa/] [som.h] - Blame information for rev 709

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 709 jeremybenn
/* Definitions for SOM assembler support.
2
   Copyright (C) 1999, 2001, 2002, 2003, 2004, 2005, 2007, 2010, 2011
3
   Free Software Foundation, Inc.
4
 
5
This file is part of GCC.
6
 
7
GCC is free software; you can redistribute it and/or modify
8
it under the terms of the GNU General Public License as published by
9
the Free Software Foundation; either version 3, or (at your option)
10
any later version.
11
 
12
GCC is distributed in the hope that it will be useful,
13
but WITHOUT ANY WARRANTY; without even the implied warranty of
14
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15
GNU General Public License for more details.
16
 
17
You should have received a copy of the GNU General Public License
18
along with GCC; see the file COPYING3.  If not see
19
<http://www.gnu.org/licenses/>.  */
20
 
21
/* So we can conditionalize small amounts of code in pa.c or pa.md.  */
22
#undef TARGET_SOM
23
#define TARGET_SOM 1
24
 
25
/* We do not use BINCL stabs in SOM.
26
   ??? If it does not hurt, we probably should to avoid useless divergence
27
   from other embedded stabs implementations.  */
28
#undef DBX_USE_BINCL
29
 
30
#define DBX_LINES_FUNCTION_RELATIVE 1
31
 
32
/* gdb needs a null N_SO at the end of each file for scattered loading.  */
33
 
34
#define DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END
35
 
36
/* HPUX has a program 'chatr' to list the dependencies of dynamically
37
   linked executables and shared libraries.  */
38
#define LDD_SUFFIX "chatr"
39
/* Look for lines like "dynamic   /usr/lib/X11R5/libX11.sl"
40
   or "static    /usr/lib/X11R5/libX11.sl".
41
 
42
   HPUX 10.20 also has lines like "static branch prediction ..."
43
   so we filter that out explicitly.
44
 
45
   We also try to bound our search for libraries with marker
46
   lines.  What a pain.  */
47
#define PARSE_LDD_OUTPUT(PTR)                                   \
48
do {                                                            \
49
  static int in_shlib_list = 0;                                  \
50
  while (*PTR == ' ') PTR++;                                    \
51
  if (strncmp (PTR, "shared library list:",                     \
52
               sizeof ("shared library list:") - 1) == 0)        \
53
    {                                                           \
54
      PTR = 0;                                                   \
55
      in_shlib_list = 1;                                        \
56
    }                                                           \
57
  else if (strncmp (PTR, "shared library binding:",             \
58
                    sizeof ("shared library binding:") - 1) == 0)\
59
    {                                                           \
60
      PTR = 0;                                                   \
61
      in_shlib_list = 0;                                 \
62
    }                                                           \
63
  else if (strncmp (PTR, "static branch prediction disabled",   \
64
                    sizeof ("static branch prediction disabled") - 1) == 0)\
65
    {                                                           \
66
      PTR = 0;                                                   \
67
      in_shlib_list = 0;                                 \
68
    }                                                           \
69
  else if (in_shlib_list                                        \
70
           &&  strncmp (PTR, "dynamic", sizeof ("dynamic") - 1) == 0) \
71
    {                                                           \
72
      PTR += sizeof ("dynamic") - 1;                            \
73
      while (*p == ' ') PTR++;                                  \
74
    }                                                           \
75
  else if (in_shlib_list                                        \
76
           && strncmp (PTR, "static", sizeof ("static") - 1) == 0) \
77
    {                                                           \
78
      PTR += sizeof ("static") - 1;                             \
79
      while (*p == ' ') PTR++;                                  \
80
    }                                                           \
81
  else                                                          \
82
    PTR = 0;                                                     \
83
} while (0)
84
 
85
/* Output the label for a function definition.  */
86
#ifndef HP_FP_ARG_DESCRIPTOR_REVERSED
87
#define ASM_DOUBLE_ARG_DESCRIPTORS(FILE, ARG0, ARG1)    \
88
  do { fprintf (FILE, ",ARGW%d=FR", (ARG0));            \
89
       fprintf (FILE, ",ARGW%d=FU", (ARG1));} while (0)
90
#define DFMODE_RETURN_STRING ",RTNVAL=FU"
91
#define SFMODE_RETURN_STRING ",RTNVAL=FR"
92
#else
93
#define ASM_DOUBLE_ARG_DESCRIPTORS(FILE, ARG0, ARG1)    \
94
  do { fprintf (FILE, ",ARGW%d=FU", (ARG0));            \
95
       fprintf (FILE, ",ARGW%d=FR", (ARG1));} while (0)
96
#define DFMODE_RETURN_STRING ",RTNVAL=FR"
97
#define SFMODE_RETURN_STRING ",RTNVAL=FU"
98
#endif
99
 
100
 
101
#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
102
    do { tree fntype = TREE_TYPE (TREE_TYPE (DECL));                    \
103
         tree tree_type = TREE_TYPE (DECL);                             \
104
         tree parm;                                                     \
105
         int i;                                                         \
106
         if (TREE_PUBLIC (DECL) || TARGET_GAS)                          \
107
           {                                                            \
108
             if (TREE_PUBLIC (DECL))                                    \
109
               {                                                        \
110
                 fputs ("\t.EXPORT ", FILE);                            \
111
                 assemble_name (FILE, NAME);                            \
112
                 fputs (",ENTRY,PRIV_LEV=3", FILE);                     \
113
               }                                                        \
114
             else                                                       \
115
               {                                                        \
116
                 fputs ("\t.PARAM ", FILE);                             \
117
                 assemble_name (FILE, NAME);                            \
118
                 fputs (",PRIV_LEV=3", FILE);                           \
119
               }                                                        \
120
             for (parm = DECL_ARGUMENTS (DECL), i = 0; parm && i < 4;    \
121
                  parm = DECL_CHAIN (parm))                             \
122
               {                                                        \
123
                 if (TYPE_MODE (DECL_ARG_TYPE (parm)) == SFmode         \
124
                     && ! TARGET_SOFT_FLOAT)                            \
125
                   fprintf (FILE, ",ARGW%d=FR", i++);                   \
126
                 else if (TYPE_MODE (DECL_ARG_TYPE (parm)) == DFmode    \
127
                          && ! TARGET_SOFT_FLOAT)                       \
128
                   {                                                    \
129
                     if (i <= 2)                                        \
130
                       {                                                \
131
                         if (i == 1) i++;                               \
132
                         ASM_DOUBLE_ARG_DESCRIPTORS (FILE, i++, i++);   \
133
                       }                                                \
134
                     else                                               \
135
                       break;                                           \
136
                   }                                                    \
137
                 else                                                   \
138
                   {                                                    \
139
                     int arg_size =                                     \
140
                       FUNCTION_ARG_SIZE (TYPE_MODE (DECL_ARG_TYPE (parm)),\
141
                                          DECL_ARG_TYPE (parm));        \
142
                     /* Passing structs by invisible reference uses     \
143
                        one general register.  */                       \
144
                     if (arg_size > 2                                   \
145
                         || TREE_ADDRESSABLE (DECL_ARG_TYPE (parm)))    \
146
                       arg_size = 1;                                    \
147
                     if (arg_size == 2 && i <= 2)                       \
148
                       {                                                \
149
                         if (i == 1) i++;                               \
150
                         fprintf (FILE, ",ARGW%d=GR", i++);             \
151
                         fprintf (FILE, ",ARGW%d=GR", i++);             \
152
                       }                                                \
153
                     else if (arg_size == 1)                            \
154
                       fprintf (FILE, ",ARGW%d=GR", i++);               \
155
                     else                                               \
156
                       i += arg_size;                                   \
157
                   }                                                    \
158
               }                                                        \
159
             /* anonymous args */                                       \
160
             if (stdarg_p (tree_type))                                  \
161
               {                                                        \
162
                 for (; i < 4; i++)                                     \
163
                   fprintf (FILE, ",ARGW%d=GR", i);                     \
164
               }                                                        \
165
             if (TYPE_MODE (fntype) == DFmode && ! TARGET_SOFT_FLOAT)   \
166
               fputs (DFMODE_RETURN_STRING, FILE);                      \
167
             else if (TYPE_MODE (fntype) == SFmode && ! TARGET_SOFT_FLOAT) \
168
               fputs (SFMODE_RETURN_STRING, FILE);                      \
169
             else if (fntype != void_type_node)                         \
170
               fputs (",RTNVAL=GR", FILE);                              \
171
             fputs ("\n", FILE);                                        \
172
           }} while (0)
173
 
174
#define TARGET_ASM_FILE_START pa_som_file_start
175
#define TARGET_ASM_INIT_SECTIONS pa_som_asm_init_sections
176
 
177
/* String to output before writable data.  */
178
#define DATA_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $DATA$\n"
179
 
180
/* String to output before uninitialized data.  */
181
#define BSS_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $BSS$\n"
182
 
183
/* This is how to output a command to make the user-level label
184
   named NAME defined for reference from other files.  We use
185
   assemble_name_raw instead of assemble_name since a symbol in
186
   a .IMPORT directive that isn't otherwise referenced is not
187
   placed in the symbol table of the assembled object.
188
 
189
   Failure to import a function reference can cause the HP linker
190
   to segmentation fault!
191
 
192
   Note that the SOM based tools need the symbol imported as a
193
   CODE symbol, while the ELF based tools require the symbol to
194
   be imported as an ENTRY symbol.  */
195
 
196
#define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \
197
  pa_hpux_asm_output_external ((FILE), (DECL), (NAME))
198
#define ASM_OUTPUT_EXTERNAL_REAL(FILE, DECL, NAME) \
199
  do { fputs ("\t.IMPORT ", FILE);                                      \
200
       assemble_name_raw (FILE, NAME);                                  \
201
       if (FUNCTION_NAME_P (NAME))                                      \
202
         fputs (",CODE\n", FILE);                                       \
203
       else                                                             \
204
         fputs (",DATA\n", FILE);                                       \
205
     } while (0)
206
 
207
/* The bogus HP assembler requires ALL external references to be
208
   "imported", even library calls.  They look a bit different, so
209
   here's this macro.
210
 
211
   Also note not all libcall names are passed to pa_encode_section_info
212
   (__main for example).  To make sure all libcall names have section
213
   info recorded in them, we do it here.
214
 
215
   We must also ensure that a libcall that has been previously
216
   exported is not subsequently imported since the HP assembler may
217
   change the type from an ENTRY to a CODE symbol.  This would make
218
   the symbol local.  We are forced to use the identifier node
219
   associated with the real assembler name for this check as the
220
   symbol_ref available in ASM_DECLARE_FUNCTION_NAME is not the
221
   same as the one used here.  As a result, we can't use flags
222
   in the symbol_ref for this check.  The identifier check assumes
223
   assemble_external_libcall is called before the symbol is used.  */
224
 
225
#define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, RTL) \
226
  do { const char *name;                                                \
227
       tree id;                                                         \
228
                                                                        \
229
       if (!function_label_operand (RTL, VOIDmode))                     \
230
         pa_encode_label (RTL);                                         \
231
                                                                        \
232
       name = targetm.strip_name_encoding (XSTR ((RTL), 0));             \
233
       id = maybe_get_identifier (name);                                \
234
       if (!id || !TREE_SYMBOL_REFERENCED (id))                         \
235
         {                                                              \
236
           fputs ("\t.IMPORT ", FILE);                                  \
237
           assemble_name_raw (FILE, XSTR ((RTL), 0));                    \
238
           fputs (",CODE\n", FILE);                                     \
239
         }                                                              \
240
     } while (0)
241
 
242
/* We want __gcc_plt_call to appear in every program built by
243
   gcc, so we make a reference to it out of __main.
244
   We use the asm statement to fool the optimizer into not
245
   removing the dead (but important) initialization of
246
   REFERENCE.  */
247
 
248
#define DO_GLOBAL_DTORS_BODY                    \
249
do {                                            \
250
  extern void __gcc_plt_call (void);            \
251
  void (*reference)(void) = &__gcc_plt_call;    \
252
  func_ptr *p;                                  \
253
  __asm__ ("" : : "r" (reference));             \
254
  for (p = __DTOR_LIST__ + 1; *p; )             \
255
    (*p++) ();                                  \
256
} while (0)
257
 
258
/* This macro specifies the biggest alignment supported by the object
259
   file format of this machine.
260
 
261
   The .align directive in the HP assembler allows alignments up to 4096
262
   bytes.  However, the maximum alignment of a global common symbol is 8
263
   bytes for objects smaller than the page size (4096 bytes).  For larger
264
   objects, the linker provides an alignment of 32 bytes.  Unfortunately,
265
   this macro doesn't provide a mechanism to test for common symbols.  */
266
#define MAX_OFILE_ALIGNMENT 32768
267
 
268
/* The SOM linker hardcodes paths into binaries.  As a result, dotdots
269
   must be removed from library prefixes to prevent binaries from depending
270
   on the location of the GCC tool directory.  The downside is GCC
271
   cannot be moved after installation using a symlink.  */
272
#undef TARGET_ALWAYS_STRIP_DOTDOT
273
#define TARGET_ALWAYS_STRIP_DOTDOT true
274
 
275
/* If GAS supports weak, we can support weak when we have working linker
276
   support for secondary definitions and are generating code for GAS.
277
   This is primarily for one-only support as SOM doesn't allow undefined
278
   weak symbols.  */
279
#ifdef HAVE_GAS_WEAK
280
#define TARGET_SUPPORTS_WEAK (TARGET_SOM_SDEF && TARGET_GAS)
281
#else
282
#define TARGET_SUPPORTS_WEAK 0
283
#endif
284
 
285
/* CVS GAS as of 4/28/04 supports a comdat parameter for the .nsubspa
286
   directive.  This provides one-only linkage semantics even though we
287
   don't have weak support.  */
288
#ifdef HAVE_GAS_NSUBSPA_COMDAT
289
#define SUPPORTS_SOM_COMDAT (TARGET_GAS)
290
#else
291
#define SUPPORTS_SOM_COMDAT 0
292
#endif
293
 
294
/* We can support one only if we support weak or comdat.  */
295
#define SUPPORTS_ONE_ONLY (TARGET_SUPPORTS_WEAK || SUPPORTS_SOM_COMDAT)
296
 
297
/* We use DECL_COMMON for uninitialized one-only variables as we don't
298
   have linkonce .bss.  We use SOM secondary definitions or comdat for
299
   initialized variables and functions.  */
300
#define MAKE_DECL_ONE_ONLY(DECL) \
301
  do {                                                                  \
302
    if (TREE_CODE (DECL) == VAR_DECL                                    \
303
        && (DECL_INITIAL (DECL) == 0                                     \
304
            || DECL_INITIAL (DECL) == error_mark_node))                 \
305
      DECL_COMMON (DECL) = 1;                                           \
306
    else if (TARGET_SUPPORTS_WEAK)                                      \
307
      DECL_WEAK (DECL) = 1;                                             \
308
  } while (0)
309
 
310
/* This is how we tell the assembler that a symbol is weak.  The SOM
311
   weak implementation uses the secondary definition (sdef) flag.
312
 
313
   The behavior of sdef symbols is similar to ELF weak symbols in that
314
   multiple definitions can occur without incurring a link error.
315
   However, they differ in the following ways:
316
     1) Undefined sdef symbols are not allowed.
317
     2) The linker searches for undefined sdef symbols and will load an
318
        archive library member to resolve an undefined sdef symbol.
319
     3) The exported symbol from a shared library is a primary symbol
320
        rather than a sdef symbol.  Thus, more care is needed in the
321
        ordering of libraries.
322
 
323
   It appears that the linker discards extra copies of "weak" functions
324
   when linking shared libraries, independent of whether or not they
325
   are in their own section.  In linking final executables, -Wl,-O can
326
   be used to remove dead procedures.  Thus, support for named sections
327
   is not needed and in previous testing caused problems with various
328
   HP tools.  */
329
#define ASM_WEAKEN_LABEL(FILE,NAME) \
330
  do { fputs ("\t.weak\t", FILE);                               \
331
       assemble_name (FILE, NAME);                              \
332
       fputc ('\n', FILE);                                      \
333
       targetm.asm_out.globalize_label (FILE, NAME);            \
334
  } while (0)
335
 
336
/* We can't handle weak aliases, and therefore can't support pragma weak.
337
   Suppress the use of pragma weak in gthr-dce.h and gthr-posix.h.  */
338
#define GTHREAD_USE_WEAK 0
339
 
340
/* Shared library suffix.  Collect2 strips the version string after
341
   this suffix when generating constructor/destructor names.  */
342
#define SHLIB_SUFFIX ".sl"
343
 
344
#define TARGET_HAVE_NAMED_SECTIONS false
345
 
346
#define TARGET_ASM_TM_CLONE_TABLE_SECTION pa_som_tm_clone_table_section

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.