gcc/config/arm/aof.h

   1 /* Definitions of target machine for GNU compiler, for Advanced RISC Machines
   2    ARM compilation, AOF Assembler.
   3    Copyright (C) 1995, 1996, 1997, 2000 Free Software Foundation, Inc.
   4    Contributed by Richard Earnshaw (rearnsha@armltd.co.uk)
   5
   6 This file is part of GNU CC.
   7
   8 GNU CC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2, or (at your option)
  11 any later version.
  12
  13 GNU CC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GNU CC; see the file COPYING.  If not, write to
  20 the Free Software Foundation, 59 Temple Place - Suite 330,
  21 Boston, MA 02111-1307, USA.  */
  22
  23 \f
  24
  25 #define AOF_ASSEMBLER
  26
  27 #define LINK_LIBGCC_SPECIAL 1
  28
  29 #define LINK_SPEC "%{aof} %{bin} %{aif} %{ihf} %{shl,*} %{reent*} %{split} \
  30                    %{ov*,*} %{reloc*} -nodebug"
  31
  32 #define STARTFILE_SPEC "crtbegin.o%s"
  33
  34 #define ENDFILE_SPEC "crtend.o%s"
  35
  36 #ifndef ASM_SPEC
  37 #define ASM_SPEC "%{g -g} -arch 4 \
  38 -apcs 3%{mapcs-32:/32bit}%{mapcs-26:/26bit}%{!mapcs-26:%{!macps-32:/26bit}}"
  39 #endif
  40
  41 #ifndef LIB_SPEC
  42 #define LIB_SPEC "%{Eb: armlib_h.32b%s}%{!Eb: armlib_h.32l%s}"
  43 #endif
  44
  45 #define LIBGCC_SPEC "libgcc.a%s"
  46
  47 /* Dividing the Output into Sections (Text, Data, ...) */
  48 /* AOF Assembler syntax is a nightmare when it comes to areas, since once
  49    we change from one area to another, we can't go back again.  Instead,
  50    we must create a new area with the same attributes and add the new output
  51    to that.  Unfortunately, there is nothing we can do here to guarantee that
  52    two areas with the same attributes will be linked adjacently in the
  53    resulting executable, so we have to be careful not to do pc-relative
  54    addressing across such boundaries.  */
  55 #define TEXT_SECTION_ASM_OP aof_text_section ()
  56
  57 #define DATA_SECTION_ASM_OP aof_data_section ()
  58
  59 #define EXTRA_SECTIONS in_zero_init, in_common
  60
  61 #define EXTRA_SECTION_FUNCTIONS \
  62 ZERO_INIT_SECTION               \
  63 COMMON_SECTION
  64
  65 #define ZERO_INIT_SECTION                                       \
  66 void                                                            \
  67 zero_init_section ()                                            \
  68 {                                                               \
  69   static int zero_init_count = 1;                               \
  70   if (in_section != in_zero_init)                               \
  71     {                                                           \
  72       fprintf (asm_out_file, "\tAREA |C$$zidata%d|,NOINIT\n",   \
  73                zero_init_count++);                              \
  74       in_section = in_zero_init;                                \
  75     }                                                           \
  76 }
  77
  78 /* Used by ASM_OUTPUT_COMMON (below) to tell varasm.c that we've
  79    changed areas.  */
  80 #define COMMON_SECTION                                          \
  81 void                                                            \
  82 common_section ()                                               \
  83 {                                                               \
  84   if (in_section != in_common)                                  \
  85     {                                                           \
  86       in_section = in_common;                                   \
  87     }                                                           \
  88 }
  89 #define CTOR_LIST_BEGIN                                 \
  90 asm (CTORS_SECTION_ASM_OP);                             \
  91 extern func_ptr __CTOR_END__[1];                        \
  92 func_ptr __CTOR_LIST__[1] = {__CTOR_END__};
  93
  94 #define CTOR_LIST_END                                   \
  95 asm (CTORS_SECTION_ASM_OP);                             \
  96 func_ptr __CTOR_END__[1] = { (func_ptr) 0 };
  97
  98 #define DO_GLOBAL_CTORS_BODY            \
  99 do {                                    \
 100   func_ptr *ptr = __CTOR_LIST__ + 1;    \
 101   while (*ptr)                          \
 102     (*ptr++) ();                        \
 103 } while (0)
 104
 105 #define DTOR_LIST_BEGIN                                 \
 106 asm (DTORS_SECTION_ASM_OP);                             \
 107 extern func_ptr __DTOR_END__[1];                        \
 108 func_ptr __DTOR_LIST__[1] = {__DTOR_END__};
 109
 110 #define DTOR_LIST_END                                   \
 111 asm (DTORS_SECTION_ASM_OP);                             \
 112 func_ptr __DTOR_END__[1] = { (func_ptr) 0 };
 113
 114 #define DO_GLOBAL_DTORS_BODY            \
 115 do {                                    \
 116   func_ptr *ptr = __DTOR_LIST__ + 1;    \
 117   while (*ptr)                          \
 118     (*ptr++) ();                        \
 119 } while (0)
 120
 121 /* We really want to put Thumb tables in a read-only data section, but
 122    switching to another section during function output is not
 123    possible.  We could however do what the SPARC does and defer the
 124    whole table generation until the end of the function.  */
 125 #define JUMP_TABLES_IN_TEXT_SECTION 1
 126
 127 #ifndef ARM_OS_NAME
 128 #define ARM_OS_NAME "(generic)"
 129 #endif
 130
 131 /* For the AOF linker, we need to reference __main to force the standard
 132    library to get linked in. */
 133
 134 #define ASM_FILE_START(STREAM)                                  \
 135 {                                                               \
 136   fprintf ((STREAM), "%s Generated by gcc %s for ARM/%s\n",     \
 137            ASM_COMMENT_START, version_string, ARM_OS_NAME);     \
 138   fprintf ((STREAM), "__r0\tRN\t0\n");                          \
 139   fprintf ((STREAM), "__a1\tRN\t0\n");                          \
 140   fprintf ((STREAM), "__a2\tRN\t1\n");                          \
 141   fprintf ((STREAM), "__a3\tRN\t2\n");                          \
 142   fprintf ((STREAM), "__a4\tRN\t3\n");                          \
 143   fprintf ((STREAM), "__v1\tRN\t4\n");                          \
 144   fprintf ((STREAM), "__v2\tRN\t5\n");                          \
 145   fprintf ((STREAM), "__v3\tRN\t6\n");                          \
 146   fprintf ((STREAM), "__v4\tRN\t7\n");                          \
 147   fprintf ((STREAM), "__v5\tRN\t8\n");                          \
 148   fprintf ((STREAM), "__v6\tRN\t9\n");                          \
 149   fprintf ((STREAM), "__sl\tRN\t10\n");                         \
 150   fprintf ((STREAM), "__fp\tRN\t11\n");                         \
 151   fprintf ((STREAM), "__ip\tRN\t12\n");                         \
 152   fprintf ((STREAM), "__sp\tRN\t13\n");                         \
 153   fprintf ((STREAM), "__lr\tRN\t14\n");                         \
 154   fprintf ((STREAM), "__pc\tRN\t15\n");                         \
 155   fprintf ((STREAM), "__f0\tFN\t0\n");                          \
 156   fprintf ((STREAM), "__f1\tFN\t1\n");                          \
 157   fprintf ((STREAM), "__f2\tFN\t2\n");                          \
 158   fprintf ((STREAM), "__f3\tFN\t3\n");                          \
 159   fprintf ((STREAM), "__f4\tFN\t4\n");                          \
 160   fprintf ((STREAM), "__f5\tFN\t5\n");                          \
 161   fprintf ((STREAM), "__f6\tFN\t6\n");                          \
 162   fprintf ((STREAM), "__f7\tFN\t7\n");                          \
 163   text_section ();                                              \
 164 }
 165
 166 /* Some systems use __main in a way incompatible with its use in gcc, in these
 167    cases use the macros NAME__MAIN to give a quoted symbol and SYMBOL__MAIN to
 168    give the same symbol without quotes for an alternative entry point.  You
 169    must define both, or neither. */
 170 #define NAME__MAIN "__gccmain"
 171 #define SYMBOL__MAIN __gccmain
 172
 173 #define ASM_FILE_END(STREAM)            \
 174 do                                      \
 175 {                                       \
 176   if (flag_pic)                         \
 177     aof_dump_pic_table (STREAM);        \
 178   aof_dump_imports (STREAM);            \
 179   fputs ("\tEND\n", (STREAM));          \
 180 } while (0);
 181
 182 #define ASM_COMMENT_START ";"
 183
 184 #define ASM_APP_ON ""
 185
 186 #define ASM_APP_OFF ""
 187
 188 #define ASM_OUTPUT_ASCII(STREAM,PTR,LEN)                \
 189 {                                                       \
 190   int i;                                                \
 191   const char *ptr = (PTR);                              \
 192   fprintf ((STREAM), "\tDCB");                          \
 193   for (i = 0; i < (long)(LEN); i++)                     \
 194     fprintf ((STREAM), " &%02x%s",                      \
 195              (unsigned ) *(ptr++),                      \
 196              (i + 1 < (long)(LEN)                               \
 197               ? ((i & 3) == 3 ? "\n\tDCB" : ",")        \
 198               : "\n"));                                 \
 199 }
 200
 201 #define IS_ASM_LOGICAL_LINE_SEPARATOR(C) ((C) == '\n')
 202
 203 /* Output of Uninitialized Variables */
 204
 205 #define ASM_OUTPUT_COMMON(STREAM,NAME,SIZE,ROUNDED)             \
 206   (common_section (),                                           \
 207    fprintf ((STREAM), "\tAREA "),                               \
 208    assemble_name ((STREAM), (NAME)),                            \
 209    fprintf ((STREAM), ", DATA, COMMON\n\t%% %d\t%s size=%d\n",  \
 210             (ROUNDED), ASM_COMMENT_START, SIZE))
 211
 212 #define ASM_OUTPUT_LOCAL(STREAM,NAME,SIZE,ROUNDED)      \
 213    (zero_init_section (),                               \
 214     assemble_name ((STREAM), (NAME)),                   \
 215     fprintf ((STREAM), "\n"),                           \
 216     fprintf ((STREAM), "\t%% %d\t%s size=%d\n",         \
 217              (ROUNDED), ASM_COMMENT_START, SIZE))
 218
 219 /* Output and Generation of Labels */
 220
 221 extern int arm_main_function;
 222
 223 /* Globalizing directive for a label.  */
 224 #define GLOBAL_ASM_OP "\tEXPORT\t"
 225
 226 #define ASM_OUTPUT_LABEL(STREAM,NAME)   \
 227 do {                                    \
 228   assemble_name (STREAM,NAME);          \
 229   fputs ("\n", STREAM);                 \
 230 } while (0)
 231
 232 #define ASM_DECLARE_FUNCTION_NAME(STREAM,NAME,DECL) \
 233 {                                               \
 234   if (TARGET_POKE_FUNCTION_NAME)                \
 235     arm_poke_function_name ((STREAM), (NAME));  \
 236   ASM_OUTPUT_LABEL (STREAM, NAME);              \
 237   if (! TREE_PUBLIC (DECL))                     \
 238     {                                           \
 239       fputs ("\tKEEP ", STREAM);                \
 240       ASM_OUTPUT_LABEL (STREAM, NAME);          \
 241     }                                           \
 242   aof_delete_import ((NAME));                   \
 243 }
 244
 245 #define ASM_DECLARE_OBJECT_NAME(STREAM,NAME,DECL) \
 246 {                                               \
 247   ASM_OUTPUT_LABEL (STREAM, NAME);              \
 248   if (! TREE_PUBLIC (DECL))                     \
 249     {                                           \
 250       fputs ("\tKEEP ", STREAM);                \
 251       ASM_OUTPUT_LABEL (STREAM, NAME);          \
 252     }                                           \
 253   aof_delete_import ((NAME));                   \
 254 }
 255
 256 #define ASM_OUTPUT_EXTERNAL(STREAM,DECL,NAME)   \
 257  aof_add_import ((NAME))
 258
 259 #define ASM_OUTPUT_EXTERNAL_LIBCALL(STREAM,SYMREF)      \
 260  (fprintf ((STREAM), "\tIMPORT\t"),                     \
 261   assemble_name ((STREAM), XSTR ((SYMREF), 0)),         \
 262   fputc ('\n', (STREAM)))
 263
 264 #define ASM_OUTPUT_LABELREF(STREAM,NAME)        \
 265   fprintf ((STREAM), "|%s|", NAME)
 266
 267 #define ASM_GENERATE_INTERNAL_LABEL(STRING,PREFIX,NUM)  \
 268   sprintf ((STRING), "*|%s..%ld|", (PREFIX), (long)(NUM))
 269
 270 #define ASM_FORMAT_PRIVATE_NAME(OUTVAR,NAME,NUMBER)     \
 271  ((OUTVAR) = (char *) alloca (strlen ((NAME)) + 10),    \
 272   sprintf ((OUTVAR), "%s.%d", (NAME), (NUMBER)))
 273
 274 /* How initialization functions are handled */
 275
 276 #define CTORS_SECTION_ASM_OP "\tAREA\t|C$$gnu_ctorsvec|, DATA, READONLY"
 277 #define DTORS_SECTION_ASM_OP "\tAREA\t|C$$gnu_dtorsvec|, DATA, READONLY"
 278
 279 /* Output of Assembler Instructions */
 280
 281 #define REGISTER_NAMES                  \
 282 {                                       \
 283   "a1", "a2", "a3", "a4",       \
 284   "v1", "v2", "v3", "v4",       \
 285   "v5", "v6", "sl", "fp",       \
 286   "ip", "sp", "lr", "pc",       \
 287   "f0", "f1", "f2", "f3",       \
 288   "f4", "f5", "f6", "f7",       \
 289   "cc", "sfp", "afp"            \
 290 }
 291
 292 #define ADDITIONAL_REGISTER_NAMES               \
 293 {                                               \
 294   {"r0", 0}, {"a1", 0},                         \
 295   {"r1", 1}, {"a2", 1},                         \
 296   {"r2", 2}, {"a3", 2},                         \
 297   {"r3", 3}, {"a4", 3},                         \
 298   {"r4", 4}, {"v1", 4},                         \
 299   {"r5", 5}, {"v2", 5},                         \
 300   {"r6", 6}, {"v3", 6},                         \
 301   {"r7", 7}, {"wr", 7},                         \
 302   {"r8", 8}, {"v5", 8},                         \
 303   {"r9", 9}, {"v6", 9},                         \
 304   {"r10", 10}, {"sl", 10}, {"v7", 10},          \
 305   {"r11", 11}, {"fp", 11},                      \
 306   {"r12", 12}, {"ip", 12},                      \
 307   {"r13", 13}, {"sp", 13},                      \
 308   {"r14", 14}, {"lr", 14},                      \
 309   {"r15", 15}, {"pc", 15}                       \
 310 }
 311
 312 #define REGISTER_PREFIX "__"
 313 #define USER_LABEL_PREFIX ""
 314 #define LOCAL_LABEL_PREFIX ""
 315
 316 /* AOF does not prefix user function names with an underscore.  */
 317 #define ARM_MCOUNT_NAME "_mcount"
 318
 319 /* Output of Dispatch Tables */
 320
 321 #define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM,BODY,VALUE,REL)                 \
 322   do {                                                                  \
 323     if (TARGET_ARM)                                                     \
 324       fprintf ((STREAM), "\tb\t|L..%d|\n", (VALUE));                    \
 325     else                                                                \
 326       fprintf ((STREAM), "\tDCD\t|L..%d| - |L..%d|\n", (VALUE), (REL)); \
 327   } while (0)
 328
 329 #define ASM_OUTPUT_ADDR_VEC_ELT(STREAM,VALUE)   \
 330   fprintf ((STREAM), "\tDCD\t|L..%d|\n", (VALUE))
 331
 332 /* A label marking the start of a jump table is a data label. */
 333 #define ASM_OUTPUT_CASE_LABEL(STREAM,PREFIX,NUM,TABLE)  \
 334   fprintf ((STREAM), "\tALIGN\n|%s..%d|\n", (PREFIX), (NUM))
 335
 336 /* Assembler Commands for Alignment */
 337
 338 #define ASM_OUTPUT_SKIP(STREAM,NBYTES)          \
 339  fprintf ((STREAM), "\t%%\t%d\n", (NBYTES))
 340
 341 #define ASM_OUTPUT_ALIGN(STREAM,POWER)                  \
 342 do {                                                    \
 343   register int amount = 1 << (POWER);                   \
 344   if (amount == 2)                                      \
 345     fprintf ((STREAM), "\tALIGN 2\n");                  \
 346   else if (amount == 4)                                 \
 347     fprintf ((STREAM), "\tALIGN\n");                    \
 348   else                                                  \
 349     fprintf ((STREAM), "\tALIGN %d\n", amount);         \
 350 } while (0)
 351
 352 #undef DBX_DEBUGGING_INFO