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 /* HPUX has a program 'chatr' to list the dependencies of dynamically
  55    linked executables and shared libraries.  */
  56 #define LDD_SUFFIX "chatr"
  57 /* Look for lines like "dynamic   /usr/lib/X11R5/libX11.sl"
  58    or "static    /usr/lib/X11R5/libX11.sl".
  59
  60    HPUX 10.20 also has lines like "static branch prediction ..."
  61    so we filter that out explicitly.
  62
  63    We also try to bound our search for libraries with marker
  64    lines.  What a pain.  */
  65 #define PARSE_LDD_OUTPUT(PTR)                                   \
  66 do {                                                            \
  67   static int in_shlib_list = 0;                                 \
  68   while (*PTR == ' ') PTR++;                                    \
  69   if (strncmp (PTR, "shared library list:",                     \
  70                sizeof ("shared library list:") - 1) == 0)       \
  71     {                                                           \
  72       PTR = 0;                                                  \
  73       in_shlib_list = 1;                                        \
  74     }                                                           \
  75   else if (strncmp (PTR, "shared library binding:",             \
  76                     sizeof ("shared library binding:") - 1) == 0)\
  77     {                                                           \
  78       PTR = 0;                                                  \
  79       in_shlib_list = 0;                                        \
  80     }                                                           \
  81   else if (strncmp (PTR, "static branch prediction disabled",   \
  82                     sizeof ("static branch prediction disabled") - 1) == 0)\
  83     {                                                           \
  84       PTR = 0;                                                  \
  85       in_shlib_list = 0;                                        \
  86     }                                                           \
  87   else if (in_shlib_list                                        \
  88            &&  strncmp (PTR, "dynamic", sizeof ("dynamic") - 1) == 0) \
  89     {                                                           \
  90       PTR += sizeof ("dynamic") - 1;                            \
  91       while (*p == ' ') PTR++;                                  \
  92     }                                                           \
  93   else if (in_shlib_list                                        \
  94            && strncmp (PTR, "static", sizeof ("static") - 1) == 0) \
  95     {                                                           \
  96       PTR += sizeof ("static") - 1;                             \
  97       while (*p == ' ') PTR++;                                  \
  98     }                                                           \
  99   else                                                          \
 100     PTR = 0;                                                    \
 101 } while (0)
 102
 103 /* Output the label for a function definition.  */
 104 #ifndef HP_FP_ARG_DESCRIPTOR_REVERSED
 105 #define ASM_DOUBLE_ARG_DESCRIPTORS(FILE, ARG0, ARG1)    \
 106   do { fprintf (FILE, ",ARGW%d=FR", (ARG0));            \
 107        fprintf (FILE, ",ARGW%d=FU", (ARG1));} while (0)
 108 #define DFMODE_RETURN_STRING ",RTNVAL=FU"
 109 #define SFMODE_RETURN_STRING ",RTNVAL=FR"
 110 #else
 111 #define ASM_DOUBLE_ARG_DESCRIPTORS(FILE, ARG0, ARG1)    \
 112   do { fprintf (FILE, ",ARGW%d=FU", (ARG0));            \
 113        fprintf (FILE, ",ARGW%d=FR", (ARG1));} while (0)
 114 #define DFMODE_RETURN_STRING ",RTNVAL=FR"
 115 #define SFMODE_RETURN_STRING ",RTNVAL=FU"
 116 #endif
 117
 118 \f
 119 /* NAME refers to the function's name.  If we are placing each function into
 120    its own section, we need to switch to the section for this function.  Note
 121    that the section name will have a "." prefix.  */
 122 #define ASM_OUTPUT_FUNCTION_PREFIX(FILE, NAME) \
 123   {                                                                     \
 124     const char *name;                                                   \
 125     STRIP_NAME_ENCODING (name, NAME);                                   \
 126     if (TARGET_GAS && in_section == in_text)                            \
 127       fputs ("\t.NSUBSPA $CODE$,QUAD=0,ALIGN=8,ACCESS=44,CODE_ONLY\n", FILE); \
 128     else if (TARGET_GAS)                                                \
 129       fprintf (FILE,                                                    \
 130                "\t.SUBSPA .%s\n", name);                                \
 131   }
 132
 133 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
 134     do { tree fntype = TREE_TYPE (TREE_TYPE (DECL));                    \
 135          tree tree_type = TREE_TYPE (DECL);                             \
 136          tree parm;                                                     \
 137          int i;                                                         \
 138          if (TREE_PUBLIC (DECL) || TARGET_GAS)                          \
 139            {                                                            \
 140              if (TREE_PUBLIC (DECL))                                    \
 141                {                                                        \
 142                  fputs ("\t.EXPORT ", FILE);                            \
 143                  assemble_name (FILE, NAME);                            \
 144                  fputs (",ENTRY,PRIV_LEV=3", FILE);                     \
 145                }                                                        \
 146              else                                                       \
 147                {                                                        \
 148                  fputs ("\t.PARAM ", FILE);                             \
 149                  assemble_name (FILE, NAME);                            \
 150                  fputs (",PRIV_LEV=3", FILE);                           \
 151                }                                                        \
 152              for (parm = DECL_ARGUMENTS (DECL), i = 0; parm && i < 4;   \
 153                   parm = TREE_CHAIN (parm))                             \
 154                {                                                        \
 155                  if (TYPE_MODE (DECL_ARG_TYPE (parm)) == SFmode         \
 156                      && ! TARGET_SOFT_FLOAT)                            \
 157                    fprintf (FILE, ",ARGW%d=FR", i++);                   \
 158                  else if (TYPE_MODE (DECL_ARG_TYPE (parm)) == DFmode    \
 159                           && ! TARGET_SOFT_FLOAT)                       \
 160                    {                                                    \
 161                      if (i <= 2)                                        \
 162                        {                                                \
 163                          if (i == 1) i++;                               \
 164                          ASM_DOUBLE_ARG_DESCRIPTORS (FILE, i++, i++);   \
 165                        }                                                \
 166                      else                                               \
 167                        break;                                           \
 168                    }                                                    \
 169                  else                                                   \
 170                    {                                                    \
 171                      int arg_size =                                     \
 172                        FUNCTION_ARG_SIZE (TYPE_MODE (DECL_ARG_TYPE (parm)),\
 173                                           DECL_ARG_TYPE (parm));        \
 174                      /* Passing structs by invisible reference uses     \
 175                         one general register.  */                       \
 176                      if (arg_size > 2                                   \
 177                          || TREE_ADDRESSABLE (DECL_ARG_TYPE (parm)))    \
 178                        arg_size = 1;                                    \
 179                      if (arg_size == 2 && i <= 2)                       \
 180                        {                                                \
 181                          if (i == 1) i++;                               \
 182                          fprintf (FILE, ",ARGW%d=GR", i++);             \
 183                          fprintf (FILE, ",ARGW%d=GR", i++);             \
 184                        }                                                \
 185                      else if (arg_size == 1)                            \
 186                        fprintf (FILE, ",ARGW%d=GR", i++);               \
 187                      else                                               \
 188                        i += arg_size;                                   \
 189                    }                                                    \
 190                }                                                        \
 191              /* anonymous args */                                       \
 192              if ((TYPE_ARG_TYPES (tree_type) != 0                       \
 193                   && (TREE_VALUE (tree_last (TYPE_ARG_TYPES (tree_type)))\
 194                       != void_type_node))                               \
 195                  || current_function_varargs)                           \
 196                {                                                        \
 197                  for (; i < 4; i++)                                     \
 198                    fprintf (FILE, ",ARGW%d=GR", i);                     \
 199                }                                                        \
 200              if (TYPE_MODE (fntype) == DFmode && ! TARGET_SOFT_FLOAT)   \
 201                fputs (DFMODE_RETURN_STRING, FILE);                      \
 202              else if (TYPE_MODE (fntype) == SFmode && ! TARGET_SOFT_FLOAT) \
 203                fputs (SFMODE_RETURN_STRING, FILE);                      \
 204              else if (fntype != void_type_node)                         \
 205                fputs (",RTNVAL=GR", FILE);                              \
 206              fputs ("\n", FILE);                                        \
 207            }} while (0)
 208
 209 /* Output at beginning of assembler file.  */
 210
 211 #define ASM_FILE_START(FILE) \
 212 do {  \
 213      if (TARGET_PA_20) \
 214        fputs("\t.LEVEL 2.0\n", FILE); \
 215      else if (TARGET_PA_11) \
 216        fputs("\t.LEVEL 1.1\n", FILE); \
 217      else \
 218        fputs("\t.LEVEL 1.0\n", FILE); \
 219      fputs ("\t.SPACE $PRIVATE$\n\
 220 \t.SUBSPA $DATA$,QUAD=1,ALIGN=8,ACCESS=31\n\
 221 \t.SUBSPA $BSS$,QUAD=1,ALIGN=8,ACCESS=31,ZERO,SORT=82\n\
 222 \t.SPACE $TEXT$\n\
 223 \t.SUBSPA $LIT$,QUAD=0,ALIGN=8,ACCESS=44\n\
 224 \t.SUBSPA $CODE$,QUAD=0,ALIGN=8,ACCESS=44,CODE_ONLY\n\
 225 \t.IMPORT $global$,DATA\n\
 226 \t.IMPORT $$dyncall,MILLICODE\n", FILE);\
 227      if (profile_flag)\
 228        fprintf (FILE, "\t.IMPORT _mcount, CODE\n");\
 229      if (write_symbols != NO_DEBUG) \
 230        output_file_directive ((FILE), main_input_filename); \
 231    } while (0)
 232
 233 /* Output before code.  */
 234
 235 /* Supposedly the assembler rejects the command if there is no tab!  */
 236 #define TEXT_SECTION_ASM_OP "\t.SPACE $TEXT$\n\t.SUBSPA $CODE$\n"
 237
 238 /* Output before read-only data.  */
 239
 240 /* Supposedly the assembler rejects the command if there is no tab!  */
 241 #define READONLY_DATA_ASM_OP "\t.SPACE $TEXT$\n\t.SUBSPA $LIT$\n"
 242
 243 #define READONLY_DATA_SECTION readonly_data
 244
 245 /* Output before writable data.  */
 246
 247 /* Supposedly the assembler rejects the command if there is no tab!  */
 248 #define DATA_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $DATA$\n"
 249
 250 /* Output before uninitialized data.  */
 251
 252 #define BSS_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $BSS$\n"
 253
 254 /* We must not have a reference to an external symbol defined in a
 255    shared library in a readonly section, else the SOM linker will
 256    complain.
 257
 258    So, we force exception information into the data section.  */
 259 #define EXCEPTION_SECTION data_section
 260
 261 /* Define the .bss section for ASM_OUTPUT_LOCAL to use. */
 262
 263 #define EXTRA_SECTIONS in_readonly_data
 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 EXTRA_SECTION_FUNCTIONS                                         \
 279 void                                                                    \
 280 readonly_data ()                                                        \
 281 {                                                                       \
 282   if (in_section != in_readonly_data)                                   \
 283     {                                                                   \
 284       if (flag_pic)                                                     \
 285         fprintf (asm_out_file, "%s\n", DATA_SECTION_ASM_OP);            \
 286       else                                                              \
 287         fprintf (asm_out_file, "%s\n", READONLY_DATA_ASM_OP);           \
 288       in_section = in_readonly_data;                                    \
 289     }                                                                   \
 290 }
 291
 292 /* This is how to output a command to make the user-level label named NAME
 293    defined for reference from other files.
 294
 295    We call assemble_name, which in turn sets TREE_SYMBOL_REFERENCED.  This
 296    macro will restore the original value of TREE_SYMBOL_REFERENCED to avoid
 297    placing useless function definitions in the output file.
 298
 299    Also note that the SOM based tools need the symbol imported as a CODE
 300    symbol, while the ELF based tools require the symbol to be imported as
 301    an ENTRY symbol.  What a crock.  */
 302
 303 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)   \
 304   do { int save_referenced;                                     \
 305        save_referenced = TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (DECL)); \
 306        fputs ("\t.IMPORT ", FILE);                                      \
 307          assemble_name (FILE, NAME);                            \
 308        if (FUNCTION_NAME_P (NAME))                              \
 309          fputs (",CODE\n", FILE);                               \
 310        else                                                     \
 311          fputs (",DATA\n", FILE);                               \
 312        TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (DECL)) = save_referenced; \
 313      } while (0)
 314
 315 /* The bogus HP assembler requires ALL external references to be
 316    "imported", even library calls. They look a bit different, so
 317    here's this macro.
 318
 319    Also note not all libcall names are passed to ENCODE_SECTION_INFO
 320    (__main for example).  To make sure all libcall names have section
 321    info recorded in them, we do it here.  */
 322
 323 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, RTL) \
 324   do { fputs ("\t.IMPORT ", FILE);                                      \
 325        if (!function_label_operand (RTL, VOIDmode))                     \
 326          hppa_encode_label (RTL);                                       \
 327        assemble_name (FILE, XSTR ((RTL), 0));                           \
 328        fputs (",CODE\n", FILE);                                         \
 329      } while (0)
 330
 331 #define ASM_FILE_END(FILE) output_deferred_plabels (FILE)
 332
 333 /* We want __gcc_plt_call to appear in every program built by
 334    gcc, so we make a reference to it out of __main.
 335    We use the asm statement to fool the optimizer into not
 336    removing the dead (but important) initialization of
 337    REFERENCE.  */
 338
 339 #define DO_GLOBAL_DTORS_BODY                    \
 340 do {                                            \
 341   extern void __gcc_plt_call ();                \
 342   void (*reference)() = &__gcc_plt_call;        \
 343   func_ptr *p;                                  \
 344   __asm__ ("" : : "r" (reference));             \
 345   for (p = __DTOR_LIST__ + 1; *p; )             \
 346     (*p++) ();                                  \
 347 } while (0)
 348
 349 /* The .align directive in the HP assembler allows up to a 32 alignment.  */
 350 #define MAX_OFILE_ALIGNMENT 32768
 351
 352 /* SOM does not support the init_priority C++ attribute.  */
 353 #undef SUPPORTS_INIT_PRIORITY
 354 #define SUPPORTS_INIT_PRIORITY 0