1 /* Definitions for SOM assembler support.
2 Copyright (C) 1999-2013 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC 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)
11 GCC 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.
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /* So we can conditionalize small amounts of code in pa.c or pa.md. */
24 /* We do not use BINCL stabs in SOM.
25 ??? If it does not hurt, we probably should to avoid useless divergence
26 from other embedded stabs implementations. */
29 #define DBX_LINES_FUNCTION_RELATIVE 1
31 /* gdb needs a null N_SO at the end of each file for scattered loading. */
33 #define DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END
35 /* HPUX has a program 'chatr' to list the dependencies of dynamically
36 linked executables and shared libraries. */
37 #define LDD_SUFFIX "chatr"
38 /* Look for lines like "dynamic /usr/lib/X11R5/libX11.sl"
39 or "static /usr/lib/X11R5/libX11.sl".
41 HPUX 10.20 also has lines like "static branch prediction ..."
42 so we filter that out explicitly.
44 We also try to bound our search for libraries with marker
45 lines. What a pain. */
46 #define PARSE_LDD_OUTPUT(PTR) \
48 static int in_shlib_list = 0; \
49 while (*PTR == ' ') PTR++; \
50 if (strncmp (PTR, "shared library list:", \
51 sizeof ("shared library list:") - 1) == 0) \
56 else if (strncmp (PTR, "shared library binding:", \
57 sizeof ("shared library binding:") - 1) == 0)\
62 else if (strncmp (PTR, "static branch prediction disabled", \
63 sizeof ("static branch prediction disabled") - 1) == 0)\
68 else if (in_shlib_list \
69 && strncmp (PTR, "dynamic", sizeof ("dynamic") - 1) == 0) \
71 PTR += sizeof ("dynamic") - 1; \
72 while (*p == ' ') PTR++; \
74 else if (in_shlib_list \
75 && strncmp (PTR, "static", sizeof ("static") - 1) == 0) \
77 PTR += sizeof ("static") - 1; \
78 while (*p == ' ') PTR++; \
84 /* Output the label for a function definition. */
85 #ifndef HP_FP_ARG_DESCRIPTOR_REVERSED
86 #define ASM_DOUBLE_ARG_DESCRIPTORS(FILE, ARG0, ARG1) \
87 do { fprintf (FILE, ",ARGW%d=FR", (ARG0)); \
88 fprintf (FILE, ",ARGW%d=FU", (ARG1));} while (0)
89 #define DFMODE_RETURN_STRING ",RTNVAL=FU"
90 #define SFMODE_RETURN_STRING ",RTNVAL=FR"
92 #define ASM_DOUBLE_ARG_DESCRIPTORS(FILE, ARG0, ARG1) \
93 do { fprintf (FILE, ",ARGW%d=FU", (ARG0)); \
94 fprintf (FILE, ",ARGW%d=FR", (ARG1));} while (0)
95 #define DFMODE_RETURN_STRING ",RTNVAL=FR"
96 #define SFMODE_RETURN_STRING ",RTNVAL=FU"
100 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
101 do { tree fntype = TREE_TYPE (TREE_TYPE (DECL)); \
102 tree tree_type = TREE_TYPE (DECL); \
105 if (TREE_PUBLIC (DECL) || TARGET_GAS) \
107 if (TREE_PUBLIC (DECL)) \
109 fputs ("\t.EXPORT ", FILE); \
110 assemble_name (FILE, NAME); \
111 fputs (",ENTRY,PRIV_LEV=3", FILE); \
115 fputs ("\t.PARAM ", FILE); \
116 assemble_name (FILE, NAME); \
117 fputs (",PRIV_LEV=3", FILE); \
119 for (parm = DECL_ARGUMENTS (DECL), i = 0; parm && i < 4; \
120 parm = DECL_CHAIN (parm)) \
122 if (TYPE_MODE (DECL_ARG_TYPE (parm)) == SFmode \
123 && ! TARGET_SOFT_FLOAT) \
124 fprintf (FILE, ",ARGW%d=FR", i++); \
125 else if (TYPE_MODE (DECL_ARG_TYPE (parm)) == DFmode \
126 && ! TARGET_SOFT_FLOAT) \
131 ASM_DOUBLE_ARG_DESCRIPTORS (FILE, i++, i++); \
139 FUNCTION_ARG_SIZE (TYPE_MODE (DECL_ARG_TYPE (parm)),\
140 DECL_ARG_TYPE (parm)); \
141 /* Passing structs by invisible reference uses \
142 one general register. */ \
144 || TREE_ADDRESSABLE (DECL_ARG_TYPE (parm))) \
146 if (arg_size == 2 && i <= 2) \
149 fprintf (FILE, ",ARGW%d=GR", i++); \
150 fprintf (FILE, ",ARGW%d=GR", i++); \
152 else if (arg_size == 1) \
153 fprintf (FILE, ",ARGW%d=GR", i++); \
158 /* anonymous args */ \
159 if (stdarg_p (tree_type)) \
162 fprintf (FILE, ",ARGW%d=GR", i); \
164 if (TYPE_MODE (fntype) == DFmode && ! TARGET_SOFT_FLOAT) \
165 fputs (DFMODE_RETURN_STRING, FILE); \
166 else if (TYPE_MODE (fntype) == SFmode && ! TARGET_SOFT_FLOAT) \
167 fputs (SFMODE_RETURN_STRING, FILE); \
168 else if (fntype != void_type_node) \
169 fputs (",RTNVAL=GR", FILE); \
170 fputs ("\n", FILE); \
173 #define TARGET_ASM_FILE_START pa_som_file_start
174 #define TARGET_ASM_INIT_SECTIONS pa_som_asm_init_sections
176 /* String to output before writable data. */
177 #define DATA_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $DATA$\n"
179 /* String to output before uninitialized data. */
180 #define BSS_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $BSS$\n"
182 /* This is how to output a command to make the user-level label
183 named NAME defined for reference from other files. We use
184 assemble_name_raw instead of assemble_name since a symbol in
185 a .IMPORT directive that isn't otherwise referenced is not
186 placed in the symbol table of the assembled object.
188 Failure to import a function reference can cause the HP linker
189 to segmentation fault!
191 Note that the SOM based tools need the symbol imported as a
192 CODE symbol, while the ELF based tools require the symbol to
193 be imported as an ENTRY symbol. */
195 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \
196 pa_hpux_asm_output_external ((FILE), (DECL), (NAME))
197 #define ASM_OUTPUT_EXTERNAL_REAL(FILE, DECL, NAME) \
198 do { fputs ("\t.IMPORT ", FILE); \
199 assemble_name_raw (FILE, NAME); \
200 if (FUNCTION_NAME_P (NAME)) \
201 fputs (",CODE\n", FILE); \
203 fputs (",DATA\n", FILE); \
206 /* The bogus HP assembler requires ALL external references to be
207 "imported", even library calls. They look a bit different, so
210 Also note not all libcall names are passed to pa_encode_section_info
211 (__main for example). To make sure all libcall names have section
212 info recorded in them, we do it here.
214 We must also ensure that a libcall that has been previously
215 exported is not subsequently imported since the HP assembler may
216 change the type from an ENTRY to a CODE symbol. This would make
217 the symbol local. We are forced to use the identifier node
218 associated with the real assembler name for this check as the
219 symbol_ref available in ASM_DECLARE_FUNCTION_NAME is not the
220 same as the one used here. As a result, we can't use flags
221 in the symbol_ref for this check. The identifier check assumes
222 assemble_external_libcall is called before the symbol is used. */
224 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, RTL) \
225 do { const char *name; \
228 if (!function_label_operand (RTL, VOIDmode)) \
229 pa_encode_label (RTL); \
231 name = targetm.strip_name_encoding (XSTR ((RTL), 0)); \
232 id = maybe_get_identifier (name); \
233 if (!id || !TREE_SYMBOL_REFERENCED (id)) \
235 fputs ("\t.IMPORT ", FILE); \
236 assemble_name_raw (FILE, XSTR ((RTL), 0)); \
237 fputs (",CODE\n", FILE); \
241 /* We want __gcc_plt_call to appear in every program built by
242 gcc, so we make a reference to it out of __main.
243 We use the asm statement to fool the optimizer into not
244 removing the dead (but important) initialization of
247 #define DO_GLOBAL_DTORS_BODY \
249 extern void __gcc_plt_call (void); \
250 void (*reference)(void) = &__gcc_plt_call; \
252 __asm__ ("" : : "r" (reference)); \
253 for (p = __DTOR_LIST__ + 1; *p; ) \
257 /* This macro specifies the biggest alignment supported by the object
258 file format of this machine.
260 The .align directive in the HP assembler allows alignments up to 4096
261 bytes. However, the maximum alignment of a global common symbol is 8
262 bytes for objects smaller than the page size (4096 bytes). For larger
263 objects, the linker provides an alignment of 32 bytes. Unfortunately,
264 this macro doesn't provide a mechanism to test for common symbols. */
265 #define MAX_OFILE_ALIGNMENT 32768
267 /* The SOM linker hardcodes paths into binaries. As a result, dotdots
268 must be removed from library prefixes to prevent binaries from depending
269 on the location of the GCC tool directory. The downside is GCC
270 cannot be moved after installation using a symlink. */
271 #undef TARGET_ALWAYS_STRIP_DOTDOT
272 #define TARGET_ALWAYS_STRIP_DOTDOT true
274 /* If GAS supports weak, we can support weak when we have working linker
275 support for secondary definitions and are generating code for GAS.
276 This is primarily for one-only support as SOM doesn't allow undefined
279 #define TARGET_SUPPORTS_WEAK (TARGET_SOM_SDEF && TARGET_GAS)
281 #define TARGET_SUPPORTS_WEAK 0
284 /* CVS GAS as of 4/28/04 supports a comdat parameter for the .nsubspa
285 directive. This provides one-only linkage semantics even though we
286 don't have weak support. */
287 #ifdef HAVE_GAS_NSUBSPA_COMDAT
288 #define SUPPORTS_SOM_COMDAT (TARGET_GAS)
290 #define SUPPORTS_SOM_COMDAT 0
293 /* We can support one only if we support weak or comdat. */
294 #define SUPPORTS_ONE_ONLY (TARGET_SUPPORTS_WEAK || SUPPORTS_SOM_COMDAT)
296 /* We use DECL_COMMON for uninitialized one-only variables as we don't
297 have linkonce .bss. We use SOM secondary definitions or comdat for
298 initialized variables and functions. */
299 #define MAKE_DECL_ONE_ONLY(DECL) \
301 if (TREE_CODE (DECL) == VAR_DECL \
302 && (DECL_INITIAL (DECL) == 0 \
303 || DECL_INITIAL (DECL) == error_mark_node)) \
304 DECL_COMMON (DECL) = 1; \
305 else if (TARGET_SUPPORTS_WEAK) \
306 DECL_WEAK (DECL) = 1; \
309 /* This is how we tell the assembler that a symbol is weak. The SOM
310 weak implementation uses the secondary definition (sdef) flag.
312 The behavior of sdef symbols is similar to ELF weak symbols in that
313 multiple definitions can occur without incurring a link error.
314 However, they differ in the following ways:
315 1) Undefined sdef symbols are not allowed.
316 2) The linker searches for undefined sdef symbols and will load an
317 archive library member to resolve an undefined sdef symbol.
318 3) The exported symbol from a shared library is a primary symbol
319 rather than a sdef symbol. Thus, more care is needed in the
320 ordering of libraries.
322 It appears that the linker discards extra copies of "weak" functions
323 when linking shared libraries, independent of whether or not they
324 are in their own section. In linking final executables, -Wl,-O can
325 be used to remove dead procedures. Thus, support for named sections
326 is not needed and in previous testing caused problems with various
328 #define ASM_WEAKEN_LABEL(FILE,NAME) \
329 do { fputs ("\t.weak\t", FILE); \
330 assemble_name (FILE, NAME); \
331 fputc ('\n', FILE); \
332 targetm.asm_out.globalize_label (FILE, NAME); \
335 /* We can't handle weak aliases, and therefore can't support pragma weak.
336 Suppress the use of pragma weak in gthr-dce.h and gthr-posix.h. */
337 #define GTHREAD_USE_WEAK 0
339 /* Shared library suffix. Collect2 strips the version string after
340 this suffix when generating constructor/destructor names. */
341 #define SHLIB_SUFFIX ".sl"
343 #define TARGET_HAVE_NAMED_SECTIONS false
345 #define TARGET_ASM_TM_CLONE_TABLE_SECTION pa_som_tm_clone_table_section