1 /* Definitions for SOM assembler support.
2 Copyright (C) 1999, 2001, 2002, 2003, 2004, 2005, 2007, 2010, 2011
3 Free Software Foundation, Inc.
5 This file is part of GCC.
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)
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.
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/>. */
21 /* So we can conditionalize small amounts of code in pa.c or pa.md. */
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. */
30 #define DBX_LINES_FUNCTION_RELATIVE 1
32 /* gdb needs a null N_SO at the end of each file for scattered loading. */
34 #define DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END
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".
42 HPUX 10.20 also has lines like "static branch prediction ..."
43 so we filter that out explicitly.
45 We also try to bound our search for libraries with marker
46 lines. What a pain. */
47 #define PARSE_LDD_OUTPUT(PTR) \
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) \
57 else if (strncmp (PTR, "shared library binding:", \
58 sizeof ("shared library binding:") - 1) == 0)\
63 else if (strncmp (PTR, "static branch prediction disabled", \
64 sizeof ("static branch prediction disabled") - 1) == 0)\
69 else if (in_shlib_list \
70 && strncmp (PTR, "dynamic", sizeof ("dynamic") - 1) == 0) \
72 PTR += sizeof ("dynamic") - 1; \
73 while (*p == ' ') PTR++; \
75 else if (in_shlib_list \
76 && strncmp (PTR, "static", sizeof ("static") - 1) == 0) \
78 PTR += sizeof ("static") - 1; \
79 while (*p == ' ') PTR++; \
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"
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"
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); \
106 if (TREE_PUBLIC (DECL) || TARGET_GAS) \
108 if (TREE_PUBLIC (DECL)) \
110 fputs ("\t.EXPORT ", FILE); \
111 assemble_name (FILE, NAME); \
112 fputs (",ENTRY,PRIV_LEV=3", FILE); \
116 fputs ("\t.PARAM ", FILE); \
117 assemble_name (FILE, NAME); \
118 fputs (",PRIV_LEV=3", FILE); \
120 for (parm = DECL_ARGUMENTS (DECL), i = 0; parm && i < 4; \
121 parm = DECL_CHAIN (parm)) \
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) \
132 ASM_DOUBLE_ARG_DESCRIPTORS (FILE, i++, i++); \
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. */ \
145 || TREE_ADDRESSABLE (DECL_ARG_TYPE (parm))) \
147 if (arg_size == 2 && i <= 2) \
150 fprintf (FILE, ",ARGW%d=GR", i++); \
151 fprintf (FILE, ",ARGW%d=GR", i++); \
153 else if (arg_size == 1) \
154 fprintf (FILE, ",ARGW%d=GR", i++); \
159 /* anonymous args */ \
160 if (stdarg_p (tree_type)) \
163 fprintf (FILE, ",ARGW%d=GR", i); \
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); \
174 #define TARGET_ASM_FILE_START pa_som_file_start
175 #define TARGET_ASM_INIT_SECTIONS pa_som_asm_init_sections
177 /* String to output before writable data. */
178 #define DATA_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $DATA$\n"
180 /* String to output before uninitialized data. */
181 #define BSS_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $BSS$\n"
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.
189 Failure to import a function reference can cause the HP linker
190 to segmentation fault!
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. */
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); \
204 fputs (",DATA\n", FILE); \
207 /* The bogus HP assembler requires ALL external references to be
208 "imported", even library calls. They look a bit different, so
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.
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. */
225 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, RTL) \
226 do { const char *name; \
229 if (!function_label_operand (RTL, VOIDmode)) \
230 pa_encode_label (RTL); \
232 name = targetm.strip_name_encoding (XSTR ((RTL), 0)); \
233 id = maybe_get_identifier (name); \
234 if (!id || !TREE_SYMBOL_REFERENCED (id)) \
236 fputs ("\t.IMPORT ", FILE); \
237 assemble_name_raw (FILE, XSTR ((RTL), 0)); \
238 fputs (",CODE\n", FILE); \
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
248 #define DO_GLOBAL_DTORS_BODY \
250 extern void __gcc_plt_call (void); \
251 void (*reference)(void) = &__gcc_plt_call; \
253 __asm__ ("" : : "r" (reference)); \
254 for (p = __DTOR_LIST__ + 1; *p; ) \
258 /* This macro specifies the biggest alignment supported by the object
259 file format of this machine.
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
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
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
280 #define TARGET_SUPPORTS_WEAK (TARGET_SOM_SDEF && TARGET_GAS)
282 #define TARGET_SUPPORTS_WEAK 0
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)
291 #define SUPPORTS_SOM_COMDAT 0
294 /* We can support one only if we support weak or comdat. */
295 #define SUPPORTS_ONE_ONLY (TARGET_SUPPORTS_WEAK || SUPPORTS_SOM_COMDAT)
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) \
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; \
310 /* This is how we tell the assembler that a symbol is weak. The SOM
311 weak implementation uses the secondary definition (sdef) flag.
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.
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
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); \
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
340 /* Shared library suffix. Collect2 strips the version string after
341 this suffix when generating constructor/destructor names. */
342 #define SHLIB_SUFFIX ".sl"
344 #define TARGET_HAVE_NAMED_SECTIONS false