1/* Definitions for SOM assembler support.
2   Copyright (C) 1999-2022 Free Software Foundation, Inc.
3
4This file is part of GCC.
5
6GCC is free software; you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published by
8the Free Software Foundation; either version 3, or (at your option)
9any later version.
10
11GCC is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with GCC; see the file COPYING3.  If not see
18<http://www.gnu.org/licenses/>.  */
19
20/* So we can conditionalize small amounts of code in pa.cc or pa.md.  */
21#undef TARGET_SOM
22#define TARGET_SOM 1
23
24/* With SOM we can only do STABS.  */
25#undef PREFERRED_DEBUGGING_TYPE
26#define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
27
28/* We do not use BINCL stabs in SOM.
29   ??? If it does not hurt, we probably should to avoid useless divergence
30   from other embedded stabs implementations.  */
31#undef DBX_USE_BINCL
32
33#define DBX_LINES_FUNCTION_RELATIVE 1
34
35/* gdb needs a null N_SO at the end of each file for scattered loading.  */
36
37#define DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END
38
39/* HPUX has a program 'chatr' to list the dependencies of dynamically
40   linked executables and shared libraries.  */
41#define LDD_SUFFIX "chatr"
42/* Look for lines like "dynamic   /usr/lib/X11R5/libX11.sl"
43   or "static    /usr/lib/X11R5/libX11.sl".
44
45   HPUX 10.20 also has lines like "static branch prediction ..."
46   so we filter that out explicitly.
47
48   We also try to bound our search for libraries with marker
49   lines.  What a pain.  */
50#define PARSE_LDD_OUTPUT(PTR)					\
51do {								\
52  static int in_shlib_list = 0;					\
53  while (*PTR == ' ') PTR++;					\
54  if (startswith (PTR, "shared library list:"))			\
55    {								\
56      PTR = 0;							\
57      in_shlib_list = 1;					\
58    }								\
59  else if (startswith (PTR, "shared library binding:"))		\
60    {								\
61      PTR = 0;							\
62      in_shlib_list = 0;					\
63    }								\
64  else if (startswith (PTR, "static branch prediction disabled")) \
65    {								\
66      PTR = 0;							\
67      in_shlib_list = 0;					\
68    }								\
69  else if (in_shlib_list					\
70	   && startswith (PTR, "dynamic"))			\
71    {								\
72      PTR += sizeof ("dynamic") - 1;				\
73      while (*p == ' ') PTR++;					\
74    }								\
75  else if (in_shlib_list					\
76	   && startswith (PTR, "static"))			\
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 tree_type = TREE_TYPE (DECL);				\
103	 tree fntype = TREE_TYPE (tree_type);				\
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		 tree type = DECL_ARG_TYPE (parm);			\
124		 machine_mode mode = TYPE_MODE (type);			\
125		 if (!AGGREGATE_TYPE_P (type)				\
126		     && mode == SFmode && ! TARGET_SOFT_FLOAT)		\
127		   fprintf (FILE, ",ARGW%d=FR", i++);			\
128		 else if (!AGGREGATE_TYPE_P (type)			\
129			  && mode == DFmode && ! TARGET_SOFT_FLOAT)	\
130		   {							\
131		     if (i <= 2)					\
132		       {						\
133			 if (i == 1) i++;				\
134			 ASM_DOUBLE_ARG_DESCRIPTORS (FILE, i++, i++);	\
135		       }						\
136		     else						\
137		       break;						\
138		   }							\
139		 else							\
140		   {							\
141		     int arg_size = pa_function_arg_size (mode, type);	\
142		     /* Passing structs by invisible reference uses	\
143			one general register.  */			\
144		     if (arg_size > 2 || TREE_ADDRESSABLE (type))	\
145		       arg_size = 1;					\
146		     if (arg_size == 2 && i <= 2)			\
147		       {						\
148			 if (i == 1) i++;				\
149			 fprintf (FILE, ",ARGW%d=GR", i++);		\
150			 fprintf (FILE, ",ARGW%d=GR", i++);		\
151		       }						\
152		     else if (arg_size == 1)				\
153		       fprintf (FILE, ",ARGW%d=GR", i++);		\
154		     else						\
155		       i += arg_size;					\
156		   }							\
157	       }							\
158	     /* anonymous args */					\
159	     if (stdarg_p (tree_type))					\
160	       {							\
161		 for (; i < 4; i++)					\
162		   fprintf (FILE, ",ARGW%d=GR", i);			\
163	       }							\
164	     if (!AGGREGATE_TYPE_P (fntype)				\
165		 && TYPE_MODE (fntype) == DFmode			\
166		 && ! TARGET_SOFT_FLOAT)				\
167	       fputs (DFMODE_RETURN_STRING, FILE);			\
168	     else if (!AGGREGATE_TYPE_P (fntype)			\
169		      && TYPE_MODE (fntype) == SFmode			\
170		      && ! TARGET_SOFT_FLOAT)				\
171	       fputs (SFMODE_RETURN_STRING, FILE);			\
172	     else if (fntype != void_type_node)				\
173	       fputs (",RTNVAL=GR", FILE);				\
174	     fputs ("\n", FILE);					\
175	   }} while (0)
176
177#define TARGET_ASM_FILE_START pa_som_file_start
178#define TARGET_ASM_INIT_SECTIONS pa_som_asm_init_sections
179
180/* String to output before writable data.  */
181#define DATA_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $DATA$\n"
182
183/* String to output before uninitialized data.  */
184#define BSS_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $BSS$\n"
185
186/* This is how to output a command to make the user-level label
187   named NAME defined for reference from other files.  We use
188   assemble_name_raw instead of assemble_name since a symbol in
189   a .IMPORT directive that isn't otherwise referenced is not
190   placed in the symbol table of the assembled object.
191
192   Failure to import a function reference can cause the HP linker
193   to segmentation fault!
194
195   Note that the SOM based tools need the symbol imported as a
196   CODE symbol, while the ELF based tools require the symbol to
197   be imported as an ENTRY symbol.  */
198
199#define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \
200  pa_hpux_asm_output_external ((FILE), (DECL), (NAME))
201#define ASM_OUTPUT_EXTERNAL_REAL(FILE, DECL, NAME) \
202  do { fputs ("\t.IMPORT ", FILE);					\
203       assemble_name_raw (FILE, NAME);					\
204       if (FUNCTION_NAME_P (NAME))					\
205	 fputs (",CODE\n", FILE);					\
206       else								\
207	 fputs (",DATA\n", FILE);					\
208     } while (0)
209
210/* The bogus HP assembler requires ALL external references to be
211   "imported", even library calls.  They look a bit different, so
212   here's this macro.
213
214   Also note not all libcall names are passed to pa_encode_section_info
215   (__main for example).  To make sure all libcall names have section
216   info recorded in them, we do it here.
217
218   We must also ensure that a libcall that has been previously
219   exported is not subsequently imported since the HP assembler may
220   change the type from an ENTRY to a CODE symbol.  This would make
221   the symbol local.  We are forced to use the identifier node
222   associated with the real assembler name for this check as the
223   symbol_ref available in ASM_DECLARE_FUNCTION_NAME is not the
224   same as the one used here.  As a result, we can't use flags
225   in the symbol_ref for this check.  The identifier check assumes
226   assemble_external_libcall is called before the symbol is used.  */
227
228#define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, RTL) \
229  do { const char *name;						\
230       tree id;								\
231									\
232       if (!function_label_operand (RTL, VOIDmode))			\
233	 pa_encode_label (RTL);						\
234									\
235       name = targetm.strip_name_encoding (XSTR ((RTL), 0));		\
236       id = maybe_get_identifier (name);				\
237       if (!id || !TREE_SYMBOL_REFERENCED (id))				\
238	 {								\
239	   fputs ("\t.IMPORT ", FILE);					\
240	   assemble_name_raw (FILE, XSTR ((RTL), 0));		       	\
241	   fputs (",CODE\n", FILE);					\
242	 }								\
243     } while (0)
244
245/* We want __gcc_plt_call to appear in every program built by
246   gcc, so we make a reference to it out of __main.
247   We use the asm statement to fool the optimizer into not
248   removing the dead (but important) initialization of
249   REFERENCE.  */
250
251#define DO_GLOBAL_DTORS_BODY			\
252do {						\
253  extern void __gcc_plt_call (void);		\
254  void (*reference)(void) = &__gcc_plt_call;	\
255  func_ptr *p;					\
256  __asm__ ("" : : "r" (reference));		\
257  for (p = __DTOR_LIST__ + 1; *p; )		\
258    (*p++) ();					\
259} while (0)
260
261/* This macro specifies the biggest alignment supported by the object
262   file format of this machine.
263
264   The .align directive in the HP assembler allows alignments up to 4096
265   bytes.  However, the maximum alignment of a global common symbol is 8
266   bytes for objects smaller than the page size (4096 bytes).  For larger
267   objects, the linker provides an alignment of 32 bytes.  Unfortunately,
268   this macro doesn't provide a mechanism to test for common symbols.  */
269#define MAX_OFILE_ALIGNMENT 32768
270
271/* The SOM linker hardcodes paths into binaries.  As a result, dotdots
272   must be removed from library prefixes to prevent binaries from depending
273   on the location of the GCC tool directory.  The downside is GCC
274   cannot be moved after installation using a symlink.  */
275#undef TARGET_ALWAYS_STRIP_DOTDOT
276#define TARGET_ALWAYS_STRIP_DOTDOT true
277
278/* If GAS supports weak, we can support weak when we have working linker
279   support for secondary definitions and are generating code for GAS.
280   This is primarily for one-only support as SOM doesn't allow undefined
281   weak symbols or weak aliases.  */
282#ifdef HAVE_GAS_WEAK
283#define TARGET_SUPPORTS_WEAK (TARGET_SOM_SDEF && TARGET_GAS)
284#else
285#define TARGET_SUPPORTS_WEAK 0
286#endif
287
288/* CVS GAS as of 4/28/04 supports a comdat parameter for the .nsubspa
289   directive.  This provides one-only linkage semantics even though we
290   don't have weak support.  */
291#ifdef HAVE_GAS_NSUBSPA_COMDAT
292#define SUPPORTS_SOM_COMDAT (TARGET_GAS)
293#else
294#define SUPPORTS_SOM_COMDAT 0
295#endif
296
297/* We can support one only if we support weak or comdat.  */
298#define SUPPORTS_ONE_ONLY (TARGET_SUPPORTS_WEAK || SUPPORTS_SOM_COMDAT)
299
300/* We use DECL_COMMON for uninitialized one-only variables as we don't
301   have linkonce .bss.  We use SOM secondary definitions or comdat for
302   initialized variables and functions.  */
303#define MAKE_DECL_ONE_ONLY(DECL) \
304  do {									\
305    if (TREE_CODE (DECL) == VAR_DECL					\
306        && (DECL_INITIAL (DECL) == 0					\
307            || DECL_INITIAL (DECL) == error_mark_node))			\
308      DECL_COMMON (DECL) = 1;						\
309    else if (TARGET_SUPPORTS_WEAK)					\
310      DECL_WEAK (DECL) = 1;						\
311  } while (0)
312
313/* This is how we tell the assembler that a symbol is weak.  The SOM
314   weak implementation uses the secondary definition (sdef) flag.
315
316   The behavior of sdef symbols is similar to ELF weak symbols in that
317   multiple definitions can occur without incurring a link error.
318   However, they differ in the following ways:
319     1) Undefined sdef symbols are not allowed.
320     2) The linker searches for undefined sdef symbols and will load an
321	archive library member to resolve an undefined sdef symbol.
322     3) The exported symbol from a shared library is a primary symbol
323        rather than a sdef symbol.  Thus, more care is needed in the
324	ordering of libraries.
325
326   It appears that the linker discards extra copies of "weak" functions
327   when linking shared libraries, independent of whether or not they
328   are in their own section.  In linking final executables, -Wl,-O can
329   be used to remove dead procedures.  Thus, support for named sections
330   is not needed and in previous testing caused problems with various
331   HP tools.  */
332#if defined HAVE_GAS_WEAK
333#define ASM_WEAKEN_DECL(FILE,DECL,NAME,VALUE) \
334  do									\
335    {									\
336      if ((VALUE) != NULL)						\
337	error_at (DECL_SOURCE_LOCATION (DECL),				\
338		  "weak aliases are not supported");			\
339      fputs ("\t.weak\t", FILE);					\
340      assemble_name (FILE, NAME);					\
341      fputc ('\n', FILE);						\
342									\
343      /* Import external objects.  */					\
344      if (DECL_EXTERNAL (DECL))						\
345	{								\
346	  fputs ("\t.IMPORT ", FILE);					\
347	  assemble_name (FILE, NAME);					\
348	  if (TREE_CODE (DECL) == FUNCTION_DECL)			\
349	    fputs (",CODE\n", FILE);					\
350	  else								\
351	    fputs (",DATA\n", FILE);					\
352	}								\
353      /* Functions are globalized by ASM_DECLARE_FUNCTION_NAME.  */	\
354      else if (TREE_CODE (DECL) != FUNCTION_DECL)			\
355	{								\
356	  fputs ("\t.EXPORT ", FILE);					\
357	  assemble_name (FILE, NAME);					\
358	  fputs (",DATA\n", FILE);					\
359	}								\
360    }									\
361  while (0)
362#endif
363
364/* Although gas accepts .weakref, it doesn't provide the correct symbol
365   type for function references.  For now, we use ASM_WEAKEN_DECL instead.
366   We have to undefine HAVE_GAS_WEAKREF to prevent default.h from defining
367   ASM_OUTPUT_WEAKREF.  */
368#undef HAVE_GAS_WEAKREF
369
370/* We can't handle weak aliases, and therefore can't support pragma weak.
371   Suppress the use of pragma weak in gthr-dce.h and gthr-posix.h.  */
372#define GTHREAD_USE_WEAK 0
373
374/* Shared library suffix.  Collect2 strips the version string after
375   this suffix when generating constructor/destructor names.  */
376#define SHLIB_SUFFIX ".sl"
377
378/* We don't have named sections.  */
379#define TARGET_HAVE_NAMED_SECTIONS false
380
381#define TARGET_ASM_TM_CLONE_TABLE_SECTION pa_som_tm_clone_table_section
382
383/* Generate specially named labels to identify DWARF 2 frame unwind
384   information.  */
385#define EH_FRAME_THROUGH_COLLECT2
386