gcc/config/pa/som.h

   1 /* Definitions for SOM assembler support.
   2    Copyright (C) 1999, 2001, 2002 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC 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 2, or (at your option)
   9 any later version.
  10
  11 GNU CC 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.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  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 /* We make the first line stab special to avoid adding several
  31    gross hacks to GAS.  */
  32 #undef  ASM_OUTPUT_SOURCE_LINE
  33 #define ASM_OUTPUT_SOURCE_LINE(file, line)              \
  34   { static int sym_lineno = 1;                          \
  35     static tree last_function_decl = NULL;              \
  36     if (current_function_decl == last_function_decl)    \
  37       fprintf (file, "\t.stabn 68,0,%d,L$M%d-%s\nL$M%d:\n",     \
  38                line, sym_lineno,                        \
  39                XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0) + 1, \
  40                sym_lineno);                             \
  41     else                                                \
  42       fprintf (file, "\t.stabn 68,0,%d,0\n", line);     \
  43     last_function_decl = current_function_decl;         \
  44     sym_lineno += 1; }
  45
  46 /* gdb needs a null N_SO at the end of each file for scattered loading.  */
  47
  48 #undef  DBX_OUTPUT_MAIN_SOURCE_FILE_END
  49 #define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME) \
  50   text_section (); \
  51   fputs ("\t.SPACE $TEXT$\n\t.NSUBSPA $CODE$,QUAD=0,ALIGN=8,ACCESS=44,CODE_ONLY\n", FILE); \
  52   fprintf (FILE,                                                        \
  53            "\t.stabs \"\",%d,0,0,L$text_end0000\nL$text_end0000:\n", N_SO)
  54
  55 /* Select a format to encode pointers in exception handling data.  CODE
  56    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
  57    true if the symbol may be affected by dynamic relocations.  Because
  58    the HP assembler does auto alignment, it is necessary to use
  59    DW_EH_PE_aligned instead of the default DW_EH_PE_absptr.  */
  60
  61 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
  62   (TARGET_GAS ? DW_EH_PE_absptr : DW_EH_PE_aligned)
  63
  64 /* HPUX has a program 'chatr' to list the dependencies of dynamically
  65    linked executables and shared libraries.  */
  66 #define LDD_SUFFIX "chatr"
  67 /* Look for lines like "dynamic   /usr/lib/X11R5/libX11.sl"
  68    or "static    /usr/lib/X11R5/libX11.sl".
  69
  70    HPUX 10.20 also has lines like "static branch prediction ..."
  71    so we filter that out explicitly.
  72
  73    We also try to bound our search for libraries with marker
  74    lines.  What a pain.  */
  75 #define PARSE_LDD_OUTPUT(PTR)                                   \
  76 do {                                                            \
  77   static int in_shlib_list = 0;                                 \
  78   while (*PTR == ' ') PTR++;                                    \
  79   if (strncmp (PTR, "shared library list:",                     \
  80                sizeof ("shared library list:") - 1) == 0)       \
  81     {                                                           \
  82       PTR = 0;                                                  \
  83       in_shlib_list = 1;                                        \
  84     }                                                           \
  85   else if (strncmp (PTR, "shared library binding:",             \
  86                     sizeof ("shared library binding:") - 1) == 0)\
  87     {                                                           \
  88       PTR = 0;                                                  \
  89       in_shlib_list = 0;                                        \
  90     }                                                           \
  91   else if (strncmp (PTR, "static branch prediction disabled",   \
  92                     sizeof ("static branch prediction disabled") - 1) == 0)\
  93     {                                                           \
  94       PTR = 0;                                                  \
  95       in_shlib_list = 0;                                        \
  96     }                                                           \
  97   else if (in_shlib_list                                        \
  98            &&  strncmp (PTR, "dynamic", sizeof ("dynamic") - 1) == 0) \
  99     {                                                           \
 100       PTR += sizeof ("dynamic") - 1;                            \
 101       while (*p == ' ') PTR++;                                  \
 102     }                                                           \
 103   else if (in_shlib_list                                        \
 104            && strncmp (PTR, "static", sizeof ("static") - 1) == 0) \
 105     {                                                           \
 106       PTR += sizeof ("static") - 1;                             \
 107       while (*p == ' ') PTR++;                                  \
 108     }                                                           \
 109   else                                                          \
 110     PTR = 0;                                                    \
 111 } while (0)
 112
 113 /* Output the label for a function definition.  */
 114 #ifndef HP_FP_ARG_DESCRIPTOR_REVERSED
 115 #define ASM_DOUBLE_ARG_DESCRIPTORS(FILE, ARG0, ARG1)    \
 116   do { fprintf (FILE, ",ARGW%d=FR", (ARG0));            \
 117        fprintf (FILE, ",ARGW%d=FU", (ARG1));} while (0)
 118 #define DFMODE_RETURN_STRING ",RTNVAL=FU"
 119 #define SFMODE_RETURN_STRING ",RTNVAL=FR"
 120 #else
 121 #define ASM_DOUBLE_ARG_DESCRIPTORS(FILE, ARG0, ARG1)    \
 122   do { fprintf (FILE, ",ARGW%d=FU", (ARG0));            \
 123        fprintf (FILE, ",ARGW%d=FR", (ARG1));} while (0)
 124 #define DFMODE_RETURN_STRING ",RTNVAL=FR"
 125 #define SFMODE_RETURN_STRING ",RTNVAL=FU"
 126 #endif
 127
 128 \f
 129 /* NAME refers to the function's name.  If we are placing each function into
 130    its own section, we need to switch to the section for this function.  Note
 131    that the section name will have a "." prefix.  */
 132 #define ASM_OUTPUT_FUNCTION_PREFIX(FILE, NAME) \
 133   {                                                                     \
 134     const char *name = (*targetm.strip_name_encoding) (NAME);           \
 135     if (TARGET_GAS && in_section == in_text)                            \
 136       fputs ("\t.NSUBSPA $CODE$,QUAD=0,ALIGN=8,ACCESS=44,CODE_ONLY\n", FILE); \
 137     else if (TARGET_GAS)                                                \
 138       fprintf (FILE,                                                    \
 139                "\t.SUBSPA .%s\n", name);                                \
 140   }
 141
 142 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
 143     do { tree fntype = TREE_TYPE (TREE_TYPE (DECL));                    \
 144          tree tree_type = TREE_TYPE (DECL);                             \
 145          tree parm;                                                     \
 146          int i;                                                         \
 147          if (TREE_PUBLIC (DECL) || TARGET_GAS)                          \
 148            {                                                            \
 149              if (TREE_PUBLIC (DECL))                                    \
 150                {                                                        \
 151                  fputs ("\t.EXPORT ", FILE);                            \
 152                  assemble_name (FILE, NAME);                            \
 153                  fputs (",ENTRY,PRIV_LEV=3", FILE);                     \
 154                }                                                        \
 155              else                                                       \
 156                {                                                        \
 157                  fputs ("\t.PARAM ", FILE);                             \
 158                  assemble_name (FILE, NAME);                            \
 159                  fputs (",PRIV_LEV=3", FILE);                           \
 160                }                                                        \
 161              for (parm = DECL_ARGUMENTS (DECL), i = 0; parm && i < 4;   \
 162                   parm = TREE_CHAIN (parm))                             \
 163                {                                                        \
 164                  if (TYPE_MODE (DECL_ARG_TYPE (parm)) == SFmode         \
 165                      && ! TARGET_SOFT_FLOAT)                            \
 166                    fprintf (FILE, ",ARGW%d=FR", i++);                   \
 167                  else if (TYPE_MODE (DECL_ARG_TYPE (parm)) == DFmode    \
 168                           && ! TARGET_SOFT_FLOAT)                       \
 169                    {                                                    \
 170                      if (i <= 2)                                        \
 171                        {                                                \
 172                          if (i == 1) i++;                               \
 173                          ASM_DOUBLE_ARG_DESCRIPTORS (FILE, i++, i++);   \
 174                        }                                                \
 175                      else                                               \
 176                        break;                                           \
 177                    }                                                    \
 178                  else                                                   \
 179                    {                                                    \
 180                      int arg_size =                                     \
 181                        FUNCTION_ARG_SIZE (TYPE_MODE (DECL_ARG_TYPE (parm)),\
 182                                           DECL_ARG_TYPE (parm));        \
 183                      /* Passing structs by invisible reference uses     \
 184                         one general register.  */                       \
 185                      if (arg_size > 2                                   \
 186                          || TREE_ADDRESSABLE (DECL_ARG_TYPE (parm)))    \
 187                        arg_size = 1;                                    \
 188                      if (arg_size == 2 && i <= 2)                       \
 189                        {                                                \
 190                          if (i == 1) i++;                               \
 191                          fprintf (FILE, ",ARGW%d=GR", i++);             \
 192                          fprintf (FILE, ",ARGW%d=GR", i++);             \
 193                        }                                                \
 194                      else if (arg_size == 1)                            \
 195                        fprintf (FILE, ",ARGW%d=GR", i++);               \
 196                      else                                               \
 197                        i += arg_size;                                   \
 198                    }                                                    \
 199                }                                                        \
 200              /* anonymous args */                                       \
 201              if (TYPE_ARG_TYPES (tree_type) != 0                        \
 202                  && (TREE_VALUE (tree_last (TYPE_ARG_TYPES (tree_type)))\
 203                      != void_type_node))                                \
 204                {                                                        \
 205                  for (; i < 4; i++)                                     \
 206                    fprintf (FILE, ",ARGW%d=GR", i);                     \
 207                }                                                        \
 208              if (TYPE_MODE (fntype) == DFmode && ! TARGET_SOFT_FLOAT)   \
 209                fputs (DFMODE_RETURN_STRING, FILE);                      \
 210              else if (TYPE_MODE (fntype) == SFmode && ! TARGET_SOFT_FLOAT) \
 211                fputs (SFMODE_RETURN_STRING, FILE);                      \
 212              else if (fntype != void_type_node)                         \
 213                fputs (",RTNVAL=GR", FILE);                              \
 214              fputs ("\n", FILE);                                        \
 215            }} while (0)
 216
 217 /* Output at beginning of assembler file.  */
 218
 219 #define ASM_FILE_START(FILE) \
 220 do {  \
 221      if (TARGET_PA_20) \
 222        fputs("\t.LEVEL 2.0\n", FILE); \
 223      else if (TARGET_PA_11) \
 224        fputs("\t.LEVEL 1.1\n", FILE); \
 225      else \
 226        fputs("\t.LEVEL 1.0\n", FILE); \
 227      fputs ("\t.SPACE $PRIVATE$\n\
 228 \t.SUBSPA $DATA$,QUAD=1,ALIGN=8,ACCESS=31\n\
 229 \t.SUBSPA $BSS$,QUAD=1,ALIGN=8,ACCESS=31,ZERO,SORT=82\n\
 230 \t.SPACE $TEXT$\n\
 231 \t.SUBSPA $LIT$,QUAD=0,ALIGN=8,ACCESS=44\n\
 232 \t.SUBSPA $CODE$,QUAD=0,ALIGN=8,ACCESS=44,CODE_ONLY\n\
 233 \t.IMPORT $global$,DATA\n\
 234 \t.IMPORT $$dyncall,MILLICODE\n", FILE);\
 235      if (profile_flag)\
 236        fprintf (FILE, "\t.IMPORT _mcount, CODE\n");\
 237      if (write_symbols != NO_DEBUG) \
 238        output_file_directive ((FILE), main_input_filename); \
 239    } while (0)
 240
 241 /* Output before code.  */
 242
 243 /* Supposedly the assembler rejects the command if there is no tab!  */
 244 #define TEXT_SECTION_ASM_OP "\t.SPACE $TEXT$\n\t.SUBSPA $CODE$\n"
 245
 246 /* Output before read-only data.  */
 247
 248 /* Supposedly the assembler rejects the command if there is no tab!  */
 249 #define READONLY_DATA_ASM_OP "\t.SPACE $TEXT$\n\t.SUBSPA $LIT$\n"
 250
 251 #define EXTRA_SECTIONS in_readonly_data
 252
 253 #define EXTRA_SECTION_FUNCTIONS                                         \
 254 extern void readonly_data PARAMS ((void));                              \
 255 void                                                                    \
 256 readonly_data ()                                                        \
 257 {                                                                       \
 258   if (in_section != in_readonly_data)                                   \
 259     {                                                                   \
 260       in_section = in_readonly_data;                                    \
 261       fprintf (asm_out_file, "%s\n", READONLY_DATA_ASM_OP);             \
 262     }                                                                   \
 263 }
 264
 265 /* FIXME: HPUX ld generates incorrect GOT entries for "T" fixups
 266    which reference data within the $TEXT$ space (for example constant
 267    strings in the $LIT$ subspace).
 268
 269    The assemblers (GAS and HP as) both have problems with handling
 270    the difference of two symbols which is the other correct way to
 271    reference constant data during PIC code generation.
 272
 273    So, there's no way to reference constant data which is in the
 274    $TEXT$ space during PIC generation.  Instead place all constant
 275    data into the $PRIVATE$ subspace (this reduces sharing, but it
 276    works correctly).  */
 277
 278 #define READONLY_DATA_SECTION (flag_pic ? data_section : readonly_data)
 279
 280 /* Output before writable data.  */
 281
 282 /* Supposedly the assembler rejects the command if there is no tab!  */
 283 #define DATA_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $DATA$\n"
 284
 285 /* Output before uninitialized data.  */
 286
 287 #define BSS_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $BSS$\n"
 288
 289 /* We must not have a reference to an external symbol defined in a
 290    shared library in a readonly section, else the SOM linker will
 291    complain.
 292
 293    So, we force exception information into the data section.  */
 294 #define TARGET_ASM_EXCEPTION_SECTION data_section
 295
 296 /* This is how to output a command to make the user-level label named NAME
 297    defined for reference from other files.
 298
 299    We call assemble_name, which in turn sets TREE_SYMBOL_REFERENCED.  This
 300    macro will restore the original value of TREE_SYMBOL_REFERENCED to avoid
 301    placing useless function definitions in the output file.
 302
 303    Also note that the SOM based tools need the symbol imported as a CODE
 304    symbol, while the ELF based tools require the symbol to be imported as
 305    an ENTRY symbol.  What a crock.  */
 306
 307 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)   \
 308   do { int save_referenced;                                     \
 309        save_referenced = TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (DECL)); \
 310        fputs ("\t.IMPORT ", FILE);                              \
 311        assemble_name (FILE, NAME);                              \
 312        if (FUNCTION_NAME_P (NAME))                              \
 313          fputs (",CODE\n", FILE);                               \
 314        else                                                     \
 315          fputs (",DATA\n", FILE);                               \
 316        TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (DECL)) = save_referenced; \
 317      } while (0)
 318
 319 /* The bogus HP assembler requires ALL external references to be
 320    "imported", even library calls. They look a bit different, so
 321    here's this macro.
 322
 323    Also note not all libcall names are passed to pa_encode_section_info
 324    (__main for example).  To make sure all libcall names have section
 325    info recorded in them, we do it here.  We must also ensure that
 326    we don't import a libcall that has been previously exported since
 327    the HP assembler may change an ENTRY symbol to a CODE symbol.  */
 328
 329 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, RTL) \
 330   do { const char *name;                                                \
 331        tree id;                                                         \
 332                                                                         \
 333        if (!function_label_operand (RTL, VOIDmode))                     \
 334          hppa_encode_label (RTL);                                       \
 335                                                                         \
 336        name = (*targetm.strip_name_encoding) (XSTR ((RTL), 0));         \
 337        id = maybe_get_identifier (name);                                \
 338        if (! id || ! TREE_SYMBOL_REFERENCED (id))                       \
 339          {                                                              \
 340            fputs ("\t.IMPORT ", FILE);                                  \
 341            assemble_name (FILE, XSTR ((RTL), 0));                       \
 342            fputs (",CODE\n", FILE);                                     \
 343          }                                                              \
 344      } while (0)
 345
 346 /* We want __gcc_plt_call to appear in every program built by
 347    gcc, so we make a reference to it out of __main.
 348    We use the asm statement to fool the optimizer into not
 349    removing the dead (but important) initialization of
 350    REFERENCE.  */
 351
 352 #define DO_GLOBAL_DTORS_BODY                    \
 353 do {                                            \
 354   extern void __gcc_plt_call ();                \
 355   void (*reference)() = &__gcc_plt_call;        \
 356   func_ptr *p;                                  \
 357   __asm__ ("" : : "r" (reference));             \
 358   for (p = __DTOR_LIST__ + 1; *p; )             \
 359     (*p++) ();                                  \
 360 } while (0)
 361
 362 /* The .align directive in the HP assembler allows up to a 32 alignment.  */
 363 #define MAX_OFILE_ALIGNMENT 32768
 364
 365 /* SOM does not support the init_priority C++ attribute.  */
 366 #undef SUPPORTS_INIT_PRIORITY
 367 #define SUPPORTS_INIT_PRIORITY 0
 368
 369 /* The SOM linker hardcodes paths into binaries.  As a result, dotdots
 370    must be removed from library prefixes to prevent binaries from depending
 371    on the location of the GCC tool directory.  The downside is GCC
 372    cannot be moved after installation using a symlink.  */
 373 #define ALWAYS_STRIP_DOTDOT 1