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 127 128 129 /* 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 /* The SOM linker hardcodes paths into binaries. As a result, dotdots 366 must be removed from library prefixes to prevent binaries from depending 367 on the location of the GCC tool directory. The downside is GCC 368 cannot be moved after installation using a symlink. */ 369 #define ALWAYS_STRIP_DOTDOT 1 370 371 /* Aggregates with a single float or double field should be passed and 372 returned in the general registers. */ 373 #define MEMBER_TYPE_FORCES_BLK(FIELD, MODE) (MODE==SFmode || MODE==DFmode) 374 375 /* If GAS supports weak, we can support weak when we have working linker 376 support for secondary definitions and are generating code for GAS. */ 377 #ifdef HAVE_GAS_WEAK 378 #define SUPPORTS_WEAK (TARGET_SOM_SDEF && TARGET_GAS) 379 #else 380 #define SUPPORTS_WEAK 0 381 #endif 382 383 /* We can support one only if we support weak. */ 384 #define SUPPORTS_ONE_ONLY SUPPORTS_WEAK 385 386 /* Use weak (secondary definitions) to make one only declarations. */ 387 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1) 388 389 /* This is how we tell the assembler that a symbol is weak. The SOM 390 weak implementation uses the secondary definition (sdef) flag. 391 392 The behavior of sdef symbols is similar to ELF weak symbols in that 393 multiple definitions can occur without incurring a link error. 394 However, they differ in the following ways: 395 1) Undefined sdef symbols are not allowed. 396 2) The linker searches for undefined sdef symbols and will load an 397 archive library member to resolve an undefined sdef symbol. 398 3) The exported symbol from a shared library is a primary symbol 399 rather than a sdef symbol. Thus, more care is needed in the 400 ordering of libraries. 401 402 It appears that the linker discards extra copies of "weak" functions 403 when linking shared libraries, independent of whether or not they 404 are in their own section. In linking final executables, -Wl,-O can 405 be used to remove dead procedures. Thus, support for named sections 406 is not needed and in previous testing caused problems with various 407 HP tools. */ 408 #define ASM_WEAKEN_LABEL(FILE,NAME) \ 409 do { fputs ("\t.weak\t", FILE); \ 410 assemble_name (FILE, NAME); \ 411 fputc ('\n', FILE); \ 412 if (! FUNCTION_NAME_P (NAME)) \ 413 { \ 414 fputs ("\t.EXPORT ", FILE); \ 415 assemble_name (FILE, NAME); \ 416 fputs (",DATA\n", FILE); \ 417 } \ 418 } while (0) 419 420 /* We can't handle weak aliases, and therefore can't support pragma weak. 421 Suppress the use of pragma weak in gthr-dce.h and gthr-posix.h. */ 422 #define GTHREAD_USE_WEAK 0 423