gcc/config/pa/som.h

   1 /* Definitions for SOM assembler support.
   2    Copyright (C) 1999, 2001 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 #define OBJ_SOM
  23
  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.  */
  27 #undef DBX_USE_BINCL
  28
  29 /* We make the first line stab special to avoid adding several
  30    gross hacks to GAS.  */
  31 #undef  ASM_OUTPUT_SOURCE_LINE
  32 #define ASM_OUTPUT_SOURCE_LINE(file, line)              \
  33   { static int sym_lineno = 1;                          \
  34     static tree last_function_decl = NULL;              \
  35     if (current_function_decl == last_function_decl)    \
  36       fprintf (file, "\t.stabn 68,0,%d,L$M%d-%s\nL$M%d:\n",     \
  37                line, sym_lineno,                        \
  38                XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0) + 1, \
  39                sym_lineno);                             \
  40     else                                                \
  41       fprintf (file, "\t.stabn 68,0,%d,0\n", line);     \
  42     last_function_decl = current_function_decl;         \
  43     sym_lineno += 1; }
  44
  45 /* gdb needs a null N_SO at the end of each file for scattered loading. */
  46
  47 #undef  DBX_OUTPUT_MAIN_SOURCE_FILE_END
  48 #define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME) \
  49   text_section (); \
  50   fputs ("\t.SPACE $TEXT$\n\t.NSUBSPA $CODE$,QUAD=0,ALIGN=8,ACCESS=44,CODE_ONLY\n", FILE); \
  51   fprintf (FILE,                                                        \
  52            "\t.stabs \"\",%d,0,0,L$text_end0000\nL$text_end0000:\n", N_SO)
  53
  54 /* Select a format to encode pointers in exception handling data.  CODE
  55    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
  56    true if the symbol may be affected by dynamic relocations.  Because
  57    the HP assembler does auto alignment, it is necessary to use
  58    DW_EH_PE_aligned instead of the default DW_EH_PE_absptr.  */
  59
  60 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
  61   (TARGET_GAS ? DW_EH_PE_absptr : DW_EH_PE_aligned)
  62
  63 /* HPUX has a program 'chatr' to list the dependencies of dynamically
  64    linked executables and shared libraries.  */
  65 #define LDD_SUFFIX "chatr"
  66 /* Look for lines like "dynamic   /usr/lib/X11R5/libX11.sl"
  67    or "static    /usr/lib/X11R5/libX11.sl".
  68
  69    HPUX 10.20 also has lines like "static branch prediction ..."
  70    so we filter that out explicitly.
  71
  72    We also try to bound our search for libraries with marker
  73    lines.  What a pain.  */
  74 #define PARSE_LDD_OUTPUT(PTR)                                   \
  75 do {                                                            \
  76   static int in_shlib_list = 0;                                 \
  77   while (*PTR == ' ') PTR++;                                    \
  78   if (strncmp (PTR, "shared library list:",                     \
  79                sizeof ("shared library list:") - 1) == 0)       \
  80     {                                                           \
  81       PTR = 0;                                                  \
  82       in_shlib_list = 1;                                        \
  83     }                                                           \
  84   else if (strncmp (PTR, "shared library binding:",             \
  85                     sizeof ("shared library binding:") - 1) == 0)\
  86     {                                                           \
  87       PTR = 0;                                                  \
  88       in_shlib_list = 0;                                        \
  89     }                                                           \
  90   else if (strncmp (PTR, "static branch prediction disabled",   \
  91                     sizeof ("static branch prediction disabled") - 1) == 0)\
  92     {                                                           \
  93       PTR = 0;                                                  \
  94       in_shlib_list = 0;                                        \
  95     }                                                           \
  96   else if (in_shlib_list                                        \
  97            &&  strncmp (PTR, "dynamic", sizeof ("dynamic") - 1) == 0) \
  98     {                                                           \
  99       PTR += sizeof ("dynamic") - 1;                            \
 100       while (*p == ' ') PTR++;                                  \
 101     }                                                           \
 102   else if (in_shlib_list                                        \
 103            && strncmp (PTR, "static", sizeof ("static") - 1) == 0) \
 104     {                                                           \
 105       PTR += sizeof ("static") - 1;                             \
 106       while (*p == ' ') PTR++;                                  \
 107     }                                                           \
 108   else                                                          \
 109     PTR = 0;                                                    \
 110 } while (0)
 111
 112 /* Output the label for a function definition.  */
 113 #ifndef HP_FP_ARG_DESCRIPTOR_REVERSED
 114 #define ASM_DOUBLE_ARG_DESCRIPTORS(FILE, ARG0, ARG1)    \
 115   do { fprintf (FILE, ",ARGW%d=FR", (ARG0));            \
 116        fprintf (FILE, ",ARGW%d=FU", (ARG1));} while (0)
 117 #define DFMODE_RETURN_STRING ",RTNVAL=FU"
 118 #define SFMODE_RETURN_STRING ",RTNVAL=FR"
 119 #else
 120 #define ASM_DOUBLE_ARG_DESCRIPTORS(FILE, ARG0, ARG1)    \
 121   do { fprintf (FILE, ",ARGW%d=FU", (ARG0));            \
 122        fprintf (FILE, ",ARGW%d=FR", (ARG1));} while (0)
 123 #define DFMODE_RETURN_STRING ",RTNVAL=FR"
 124 #define SFMODE_RETURN_STRING ",RTNVAL=FU"
 125 #endif
 126
 127 \f
 128 /* NAME refers to the function's name.  If we are placing each function into
 129    its own section, we need to switch to the section for this function.  Note
 130    that the section name will have a "." prefix.  */
 131 #define ASM_OUTPUT_FUNCTION_PREFIX(FILE, NAME) \
 132   {                                                                     \
 133     const char *name;                                                   \
 134     STRIP_NAME_ENCODING (name, 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                  || current_function_varargs)                           \
 205                {                                                        \
 206                  for (; i < 4; i++)                                     \
 207                    fprintf (FILE, ",ARGW%d=GR", i);                     \
 208                }                                                        \
 209              if (TYPE_MODE (fntype) == DFmode && ! TARGET_SOFT_FLOAT)   \
 210                fputs (DFMODE_RETURN_STRING, FILE);                      \
 211              else if (TYPE_MODE (fntype) == SFmode && ! TARGET_SOFT_FLOAT) \
 212                fputs (SFMODE_RETURN_STRING, FILE);                      \
 213              else if (fntype != void_type_node)                         \
 214                fputs (",RTNVAL=GR", FILE);                              \
 215              fputs ("\n", FILE);                                        \
 216            }} while (0)
 217
 218 /* Output at beginning of assembler file.  */
 219
 220 #define ASM_FILE_START(FILE) \
 221 do {  \
 222      if (TARGET_PA_20) \
 223        fputs("\t.LEVEL 2.0\n", FILE); \
 224      else if (TARGET_PA_11) \
 225        fputs("\t.LEVEL 1.1\n", FILE); \
 226      else \
 227        fputs("\t.LEVEL 1.0\n", FILE); \
 228      fputs ("\t.SPACE $PRIVATE$\n\
 229 \t.SUBSPA $DATA$,QUAD=1,ALIGN=8,ACCESS=31\n\
 230 \t.SUBSPA $BSS$,QUAD=1,ALIGN=8,ACCESS=31,ZERO,SORT=82\n\
 231 \t.SPACE $TEXT$\n\
 232 \t.SUBSPA $LIT$,QUAD=0,ALIGN=8,ACCESS=44\n\
 233 \t.SUBSPA $CODE$,QUAD=0,ALIGN=8,ACCESS=44,CODE_ONLY\n\
 234 \t.IMPORT $global$,DATA\n\
 235 \t.IMPORT $$dyncall,MILLICODE\n", FILE);\
 236      if (profile_flag)\
 237        fprintf (FILE, "\t.IMPORT _mcount, CODE\n");\
 238      if (write_symbols != NO_DEBUG) \
 239        output_file_directive ((FILE), main_input_filename); \
 240    } while (0)
 241
 242 /* Output before code.  */
 243
 244 /* Supposedly the assembler rejects the command if there is no tab!  */
 245 #define TEXT_SECTION_ASM_OP "\t.SPACE $TEXT$\n\t.SUBSPA $CODE$\n"
 246
 247 /* Output before read-only data.  */
 248
 249 /* Supposedly the assembler rejects the command if there is no tab!  */
 250 #define READONLY_DATA_ASM_OP "\t.SPACE $TEXT$\n\t.SUBSPA $LIT$\n"
 251
 252 #define READONLY_DATA_SECTION readonly_data
 253
 254 /* Output before writable data.  */
 255
 256 /* Supposedly the assembler rejects the command if there is no tab!  */
 257 #define DATA_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $DATA$\n"
 258
 259 /* Output before uninitialized data.  */
 260
 261 #define BSS_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $BSS$\n"
 262
 263 /* We must not have a reference to an external symbol defined in a
 264    shared library in a readonly section, else the SOM linker will
 265    complain.
 266
 267    So, we force exception information into the data section.  */
 268 #define TARGET_ASM_EXCEPTION_SECTION data_section
 269
 270 /* Define the .bss section for ASM_OUTPUT_LOCAL to use. */
 271
 272 #define EXTRA_SECTIONS in_readonly_data
 273
 274 /* FIXME: HPUX ld generates incorrect GOT entries for "T" fixups
 275    which reference data within the $TEXT$ space (for example constant
 276    strings in the $LIT$ subspace).
 277
 278    The assemblers (GAS and HP as) both have problems with handling
 279    the difference of two symbols which is the other correct way to
 280    reference constant data during PIC code generation.
 281
 282    So, there's no way to reference constant data which is in the
 283    $TEXT$ space during PIC generation.  Instead place all constant
 284    data into the $PRIVATE$ subspace (this reduces sharing, but it
 285    works correctly).  */
 286
 287 #define EXTRA_SECTION_FUNCTIONS                                         \
 288 void                                                                    \
 289 readonly_data ()                                                        \
 290 {                                                                       \
 291   if (in_section != in_readonly_data)                                   \
 292     {                                                                   \
 293       if (flag_pic)                                                     \
 294         fprintf (asm_out_file, "%s\n", DATA_SECTION_ASM_OP);            \
 295       else                                                              \
 296         fprintf (asm_out_file, "%s\n", READONLY_DATA_ASM_OP);           \
 297       in_section = in_readonly_data;                                    \
 298     }                                                                   \
 299 }
 300
 301 /* This is how to output a command to make the user-level label named NAME
 302    defined for reference from other files.
 303
 304    We call assemble_name, which in turn sets TREE_SYMBOL_REFERENCED.  This
 305    macro will restore the original value of TREE_SYMBOL_REFERENCED to avoid
 306    placing useless function definitions in the output file.
 307
 308    Also note that the SOM based tools need the symbol imported as a CODE
 309    symbol, while the ELF based tools require the symbol to be imported as
 310    an ENTRY symbol.  What a crock.  */
 311
 312 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)   \
 313   do { int save_referenced;                                     \
 314        save_referenced = TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (DECL)); \
 315        fputs ("\t.IMPORT ", FILE);                              \
 316        assemble_name (FILE, NAME);                              \
 317        if (FUNCTION_NAME_P (NAME))                              \
 318          fputs (",CODE\n", FILE);                               \
 319        else                                                     \
 320          fputs (",DATA\n", FILE);                               \
 321        TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (DECL)) = save_referenced; \
 322      } while (0)
 323
 324 /* The bogus HP assembler requires ALL external references to be
 325    "imported", even library calls. They look a bit different, so
 326    here's this macro.
 327
 328    Also note not all libcall names are passed to ENCODE_SECTION_INFO
 329    (__main for example).  To make sure all libcall names have section
 330    info recorded in them, we do it here.  We must also ensure that
 331    we don't import a libcall that has been previously exported since
 332    the HP assembler may change an ENTRY symbol to a CODE symbol.  */
 333
 334 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, RTL) \
 335   do { const char *name;                                                \
 336        tree id;                                                         \
 337                                                                         \
 338        if (!function_label_operand (RTL, VOIDmode))                     \
 339          hppa_encode_label (RTL);                                       \
 340                                                                         \
 341        STRIP_NAME_ENCODING (name, XSTR ((RTL), 0));                     \
 342        id = maybe_get_identifier (name);                                \
 343        if (! id || ! TREE_SYMBOL_REFERENCED (id))                       \
 344          {                                                              \
 345            fputs ("\t.IMPORT ", FILE);                                  \
 346            assemble_name (FILE, XSTR ((RTL), 0));                       \
 347            fputs (",CODE\n", FILE);                                     \
 348          }                                                              \
 349      } while (0)
 350
 351 #define ASM_FILE_END(FILE) output_deferred_plabels (FILE)
 352
 353 /* We want __gcc_plt_call to appear in every program built by
 354    gcc, so we make a reference to it out of __main.
 355    We use the asm statement to fool the optimizer into not
 356    removing the dead (but important) initialization of
 357    REFERENCE.  */
 358
 359 #define DO_GLOBAL_DTORS_BODY                    \
 360 do {                                            \
 361   extern void __gcc_plt_call ();                \
 362   void (*reference)() = &__gcc_plt_call;        \
 363   func_ptr *p;                                  \
 364   __asm__ ("" : : "r" (reference));             \
 365   for (p = __DTOR_LIST__ + 1; *p; )             \
 366     (*p++) ();                                  \
 367 } while (0)
 368
 369 /* The .align directive in the HP assembler allows up to a 32 alignment.  */
 370 #define MAX_OFILE_ALIGNMENT 32768
 371
 372 /* SOM does not support the init_priority C++ attribute.  */
 373 #undef SUPPORTS_INIT_PRIORITY
 374 #define SUPPORTS_INIT_PRIORITY 0