gcc/config/pa/som.h

   1 /* Definitions for SOM assembler support.
   2    Copyright (C) 1999 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 1, 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     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            { extern int current_function_varargs;                       \
 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                }                                                        \
 151              for (parm = DECL_ARGUMENTS (DECL), i = 0; parm && i < 4;   \
 152                   parm = TREE_CHAIN (parm))                             \
 153                {                                                        \
 154                  if (TYPE_MODE (DECL_ARG_TYPE (parm)) == SFmode         \
 155                      && ! TARGET_SOFT_FLOAT)                            \
 156                    fprintf (FILE, ",ARGW%d=FR", i++);                   \
 157                  else if (TYPE_MODE (DECL_ARG_TYPE (parm)) == DFmode    \
 158                           && ! TARGET_SOFT_FLOAT)                       \
 159                    {                                                    \
 160                      if (i <= 2)                                        \
 161                        {                                                \
 162                          if (i == 1) i++;                               \
 163                          ASM_DOUBLE_ARG_DESCRIPTORS (FILE, i++, i++);   \
 164                        }                                                \
 165                      else                                               \
 166                        break;                                           \
 167                    }                                                    \
 168                  else                                                   \
 169                    {                                                    \
 170                      int arg_size =                                     \
 171                        FUNCTION_ARG_SIZE (TYPE_MODE (DECL_ARG_TYPE (parm)),\
 172                                           DECL_ARG_TYPE (parm));        \
 173                      /* Passing structs by invisible reference uses     \
 174                         one general register.  */                       \
 175                      if (arg_size > 2                                   \
 176                          || TREE_ADDRESSABLE (DECL_ARG_TYPE (parm)))    \
 177                        arg_size = 1;                                    \
 178                      if (arg_size == 2 && i <= 2)                       \
 179                        {                                                \
 180                          if (i == 1) i++;                               \
 181                          fprintf (FILE, ",ARGW%d=GR", i++);             \
 182                          fprintf (FILE, ",ARGW%d=GR", i++);             \
 183                        }                                                \
 184                      else if (arg_size == 1)                            \
 185                        fprintf (FILE, ",ARGW%d=GR", i++);               \
 186                      else                                               \
 187                        i += arg_size;                                   \
 188                    }                                                    \
 189                }                                                        \
 190              /* anonymous args */                                       \
 191              if ((TYPE_ARG_TYPES (tree_type) != 0                       \
 192                   && (TREE_VALUE (tree_last (TYPE_ARG_TYPES (tree_type)))\
 193                       != void_type_node))                               \
 194                  || current_function_varargs)                           \
 195                {                                                        \
 196                  for (; i < 4; i++)                                     \
 197                    fprintf (FILE, ",ARGW%d=GR", i);                     \
 198                }                                                        \
 199              if (TYPE_MODE (fntype) == DFmode && ! TARGET_SOFT_FLOAT)   \
 200                fputs (DFMODE_RETURN_STRING, FILE);                      \
 201              else if (TYPE_MODE (fntype) == SFmode && ! TARGET_SOFT_FLOAT) \
 202                fputs (SFMODE_RETURN_STRING, FILE);                      \
 203              else if (fntype != void_type_node)                         \
 204                fputs (",RTNVAL=GR", FILE);                              \
 205              fputs ("\n", FILE);                                        \
 206            }} while (0)
 207
 208 /* Output at beginning of assembler file.  */
 209
 210 #define ASM_FILE_START(FILE) \
 211 do {  \
 212      if (TARGET_PA_20) \
 213        fputs("\t.LEVEL 2.0\n", FILE); \
 214      else if (TARGET_PA_11) \
 215        fputs("\t.LEVEL 1.1\n", FILE); \
 216      else \
 217        fputs("\t.LEVEL 1.0\n", FILE); \
 218      fputs ("\t.SPACE $PRIVATE$\n\
 219 \t.SUBSPA $DATA$,QUAD=1,ALIGN=8,ACCESS=31\n\
 220 \t.SUBSPA $BSS$,QUAD=1,ALIGN=8,ACCESS=31,ZERO,SORT=82\n\
 221 \t.SPACE $TEXT$\n\
 222 \t.SUBSPA $LIT$,QUAD=0,ALIGN=8,ACCESS=44\n\
 223 \t.SUBSPA $CODE$,QUAD=0,ALIGN=8,ACCESS=44,CODE_ONLY\n\
 224 \t.IMPORT $global$,DATA\n\
 225 \t.IMPORT $$dyncall,MILLICODE\n", FILE);\
 226      if (profile_flag)\
 227        fprintf (FILE, "\t.IMPORT _mcount, CODE\n");\
 228      if (write_symbols != NO_DEBUG) \
 229        output_file_directive ((FILE), main_input_filename); \
 230    } while (0)
 231
 232 /* Output before code.  */
 233
 234 /* Supposedly the assembler rejects the command if there is no tab!  */
 235 #define TEXT_SECTION_ASM_OP "\t.SPACE $TEXT$\n\t.SUBSPA $CODE$\n"
 236
 237 /* Output before read-only data.  */
 238
 239 /* Supposedly the assembler rejects the command if there is no tab!  */
 240 #define READONLY_DATA_ASM_OP "\t.SPACE $TEXT$\n\t.SUBSPA $LIT$\n"
 241
 242 #define READONLY_DATA_SECTION readonly_data
 243
 244 /* Output before writable data.  */
 245
 246 /* Supposedly the assembler rejects the command if there is no tab!  */
 247 #define DATA_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $DATA$\n"
 248
 249 /* Output before uninitialized data.  */
 250
 251 #define BSS_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $BSS$\n"
 252
 253 /* Define the .bss section for ASM_OUTPUT_LOCAL to use. */
 254
 255 #ifndef CTORS_SECTION_FUNCTION
 256 #define EXTRA_SECTIONS in_readonly_data
 257 #define CTORS_SECTION_FUNCTION
 258 #define DTORS_SECTION_FUNCTION
 259 #else
 260 #define EXTRA_SECTIONS in_readonly_data, in_ctors, in_dtors
 261 #endif
 262
 263 /* Switch into a generic section.
 264    This is currently only used to support section attributes.
 265
 266    We make the section read-only and executable for a function decl,
 267    read-only for a const data decl, and writable for a non-const data decl.  */
 268 #define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME, RELOC) \
 269   if (DECL && TREE_CODE (DECL) == FUNCTION_DECL)                \
 270     {                                                           \
 271       fputs ("\t.SPACE $TEXT$\n", FILE);                        \
 272       fprintf (FILE,                                            \
 273                "\t.SUBSPA %s%s%s,QUAD=0,ALIGN=8,ACCESS=44,CODE_ONLY,SORT=24\n",\
 274                TARGET_GAS ? "" : "$", NAME, TARGET_GAS ? "" : "$"); \
 275     }                                                           \
 276   else if (DECL && DECL_READONLY_SECTION (DECL, RELOC))         \
 277     {                                                           \
 278       fputs ("\t.SPACE $TEXT$\n", FILE);                        \
 279       fprintf (FILE,                                            \
 280                "\t.SUBSPA %s%s%s,QUAD=0,ALIGN=8,ACCESS=44,SORT=16\n", \
 281                TARGET_GAS ? "" : "$", NAME, TARGET_GAS ? "" : "$"); \
 282     }                                                           \
 283   else                                                          \
 284     {                                                           \
 285       fputs ("\t.SPACE $PRIVATE$\n", FILE);                     \
 286       fprintf (FILE,                                            \
 287                "\t.SUBSPA %s%s%s,QUAD=1,ALIGN=8,ACCESS=31,SORT=16\n", \
 288                TARGET_GAS ? "" : "$", NAME, TARGET_GAS ? "" : "$"); \
 289     }
 290
 291 /* FIXME: HPUX ld generates incorrect GOT entries for "T" fixups
 292    which reference data within the $TEXT$ space (for example constant
 293    strings in the $LIT$ subspace).
 294
 295    The assemblers (GAS and HP as) both have problems with handling
 296    the difference of two symbols which is the other correct way to
 297    reference constant data during PIC code generation.
 298
 299    So, there's no way to reference constant data which is in the
 300    $TEXT$ space during PIC generation.  Instead place all constant
 301    data into the $PRIVATE$ subspace (this reduces sharing, but it
 302    works correctly).  */
 303
 304 #define EXTRA_SECTION_FUNCTIONS                                         \
 305 void                                                                    \
 306 readonly_data ()                                                        \
 307 {                                                                       \
 308   if (in_section != in_readonly_data)                                   \
 309     {                                                                   \
 310       if (flag_pic)                                                     \
 311         fprintf (asm_out_file, "%s\n", DATA_SECTION_ASM_OP);            \
 312       else                                                              \
 313         fprintf (asm_out_file, "%s\n", READONLY_DATA_ASM_OP);           \
 314       in_section = in_readonly_data;                                    \
 315     }                                                                   \
 316 }                                                                       \
 317 CTORS_SECTION_FUNCTION                                                  \
 318 DTORS_SECTION_FUNCTION
 319
 320 /* This is how to output a command to make the user-level label named NAME
 321    defined for reference from other files.
 322
 323    We call assemble_name, which in turn sets TREE_SYMBOL_REFERENCED.  This
 324    macro will restore the original value of TREE_SYMBOL_REFERENCED to avoid
 325    placing useless function definitions in the output file.
 326
 327    Also note that the SOM based tools need the symbol imported as a CODE
 328    symbol, while the ELF based tools require the symbol to be imported as
 329    an ENTRY symbol.  What a crock.  */
 330
 331 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)   \
 332   do { int save_referenced;                                     \
 333        save_referenced = TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (DECL)); \
 334        fputs ("\t.IMPORT ", FILE);                                      \
 335          assemble_name (FILE, NAME);                            \
 336        if (FUNCTION_NAME_P (NAME))                              \
 337          fputs (",CODE\n", FILE);                               \
 338        else                                                     \
 339          fputs (",DATA\n", FILE);                               \
 340        TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (DECL)) = save_referenced; \
 341      } while (0)
 342
 343 /* The bogus HP assembler requires ALL external references to be
 344    "imported", even library calls. They look a bit different, so
 345    here's this macro.
 346
 347    Also note not all libcall names are passed to ENCODE_SECTION_INFO
 348    (__main for example).  To make sure all libcall names have section
 349    info recorded in them, we do it here.  */
 350
 351 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, RTL) \
 352   do { fputs ("\t.IMPORT ", FILE);                                      \
 353        if (!function_label_operand (RTL, VOIDmode))                     \
 354          hppa_encode_label (RTL, 1);                                    \
 355        assemble_name (FILE, XSTR ((RTL), 0));                           \
 356        fputs (",CODE\n", FILE);                                         \
 357      } while (0)
 358
 359 #define ASM_FILE_END(FILE) output_deferred_plabels (FILE)
 360
 361 /* We want __gcc_plt_call to appear in every program built by
 362    gcc, so we make a reference to it out of __main.
 363    We use the asm statement to fool the optimizer into not
 364    removing the dead (but important) initialization of
 365    REFERENCE.  */
 366
 367 #define DO_GLOBAL_DTORS_BODY                    \
 368 do {                                            \
 369   extern void __gcc_plt_call ();                \
 370   void (*reference)() = &__gcc_plt_call;        \
 371   func_ptr *p;                                  \
 372   __asm__ ("" : : "r" (reference));             \
 373   for (p = __DTOR_LIST__ + 1; *p; )             \
 374     (*p++) ();                                  \
 375 } while (0)
 376
 377 /* The .align directive in the HP assembler allows up to a 32 alignment.  */
 378 #define MAX_OFILE_ALIGNMENT 32768