som.h revision 1.1.1.8
1 /* Definitions for SOM assembler support. 2 Copyright (C) 1999-2020 Free Software Foundation, Inc. 3 4 This file is part of GCC. 5 6 GCC 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 3, or (at your option) 9 any later version. 10 11 GCC 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 GCC; see the file COPYING3. If not see 18 <http://www.gnu.org/licenses/>. */ 19 20 /* So we can conditionalize small amounts of code in pa.c or pa.md. */ 21 #undef TARGET_SOM 22 #define TARGET_SOM 1 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 #define DBX_LINES_FUNCTION_RELATIVE 1 30 31 /* gdb needs a null N_SO at the end of each file for scattered loading. */ 32 33 #define DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END 34 35 /* HPUX has a program 'chatr' to list the dependencies of dynamically 36 linked executables and shared libraries. */ 37 #define LDD_SUFFIX "chatr" 38 /* Look for lines like "dynamic /usr/lib/X11R5/libX11.sl" 39 or "static /usr/lib/X11R5/libX11.sl". 40 41 HPUX 10.20 also has lines like "static branch prediction ..." 42 so we filter that out explicitly. 43 44 We also try to bound our search for libraries with marker 45 lines. What a pain. */ 46 #define PARSE_LDD_OUTPUT(PTR) \ 47 do { \ 48 static int in_shlib_list = 0; \ 49 while (*PTR == ' ') PTR++; \ 50 if (strncmp (PTR, "shared library list:", \ 51 sizeof ("shared library list:") - 1) == 0) \ 52 { \ 53 PTR = 0; \ 54 in_shlib_list = 1; \ 55 } \ 56 else if (strncmp (PTR, "shared library binding:", \ 57 sizeof ("shared library binding:") - 1) == 0)\ 58 { \ 59 PTR = 0; \ 60 in_shlib_list = 0; \ 61 } \ 62 else if (strncmp (PTR, "static branch prediction disabled", \ 63 sizeof ("static branch prediction disabled") - 1) == 0)\ 64 { \ 65 PTR = 0; \ 66 in_shlib_list = 0; \ 67 } \ 68 else if (in_shlib_list \ 69 && strncmp (PTR, "dynamic", sizeof ("dynamic") - 1) == 0) \ 70 { \ 71 PTR += sizeof ("dynamic") - 1; \ 72 while (*p == ' ') PTR++; \ 73 } \ 74 else if (in_shlib_list \ 75 && strncmp (PTR, "static", sizeof ("static") - 1) == 0) \ 76 { \ 77 PTR += sizeof ("static") - 1; \ 78 while (*p == ' ') PTR++; \ 79 } \ 80 else \ 81 PTR = 0; \ 82 } while (0) 83 84 /* Output the label for a function definition. */ 85 #ifndef HP_FP_ARG_DESCRIPTOR_REVERSED 86 #define ASM_DOUBLE_ARG_DESCRIPTORS(FILE, ARG0, ARG1) \ 87 do { fprintf (FILE, ",ARGW%d=FR", (ARG0)); \ 88 fprintf (FILE, ",ARGW%d=FU", (ARG1));} while (0) 89 #define DFMODE_RETURN_STRING ",RTNVAL=FU" 90 #define SFMODE_RETURN_STRING ",RTNVAL=FR" 91 #else 92 #define ASM_DOUBLE_ARG_DESCRIPTORS(FILE, ARG0, ARG1) \ 93 do { fprintf (FILE, ",ARGW%d=FU", (ARG0)); \ 94 fprintf (FILE, ",ARGW%d=FR", (ARG1));} while (0) 95 #define DFMODE_RETURN_STRING ",RTNVAL=FR" 96 #define SFMODE_RETURN_STRING ",RTNVAL=FU" 97 #endif 98 99 100 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \ 102 do { tree tree_type = TREE_TYPE (DECL); \ 103 tree fntype = TREE_TYPE (tree_type); \ 104 tree parm; \ 105 int i; \ 106 if (TREE_PUBLIC (DECL) || TARGET_GAS) \ 107 { \ 108 if (TREE_PUBLIC (DECL)) \ 109 { \ 110 fputs ("\t.EXPORT ", FILE); \ 111 assemble_name (FILE, NAME); \ 112 fputs (",ENTRY,PRIV_LEV=3", FILE); \ 113 } \ 114 else \ 115 { \ 116 fputs ("\t.PARAM ", FILE); \ 117 assemble_name (FILE, NAME); \ 118 fputs (",PRIV_LEV=3", FILE); \ 119 } \ 120 for (parm = DECL_ARGUMENTS (DECL), i = 0; parm && i < 4; \ 121 parm = DECL_CHAIN (parm)) \ 122 { \ 123 tree type = DECL_ARG_TYPE (parm); \ 124 machine_mode mode = TYPE_MODE (type); \ 125 if (!AGGREGATE_TYPE_P (type) \ 126 && mode == SFmode && ! TARGET_SOFT_FLOAT) \ 127 fprintf (FILE, ",ARGW%d=FR", i++); \ 128 else if (!AGGREGATE_TYPE_P (type) \ 129 && mode == DFmode && ! TARGET_SOFT_FLOAT) \ 130 { \ 131 if (i <= 2) \ 132 { \ 133 if (i == 1) i++; \ 134 ASM_DOUBLE_ARG_DESCRIPTORS (FILE, i++, i++); \ 135 } \ 136 else \ 137 break; \ 138 } \ 139 else \ 140 { \ 141 int arg_size = pa_function_arg_size (mode, type); \ 142 /* Passing structs by invisible reference uses \ 143 one general register. */ \ 144 if (arg_size > 2 || TREE_ADDRESSABLE (type)) \ 145 arg_size = 1; \ 146 if (arg_size == 2 && i <= 2) \ 147 { \ 148 if (i == 1) i++; \ 149 fprintf (FILE, ",ARGW%d=GR", i++); \ 150 fprintf (FILE, ",ARGW%d=GR", i++); \ 151 } \ 152 else if (arg_size == 1) \ 153 fprintf (FILE, ",ARGW%d=GR", i++); \ 154 else \ 155 i += arg_size; \ 156 } \ 157 } \ 158 /* anonymous args */ \ 159 if (stdarg_p (tree_type)) \ 160 { \ 161 for (; i < 4; i++) \ 162 fprintf (FILE, ",ARGW%d=GR", i); \ 163 } \ 164 if (!AGGREGATE_TYPE_P (fntype) \ 165 && TYPE_MODE (fntype) == DFmode \ 166 && ! TARGET_SOFT_FLOAT) \ 167 fputs (DFMODE_RETURN_STRING, FILE); \ 168 else if (!AGGREGATE_TYPE_P (fntype) \ 169 && TYPE_MODE (fntype) == SFmode \ 170 && ! TARGET_SOFT_FLOAT) \ 171 fputs (SFMODE_RETURN_STRING, FILE); \ 172 else if (fntype != void_type_node) \ 173 fputs (",RTNVAL=GR", FILE); \ 174 fputs ("\n", FILE); \ 175 }} while (0) 176 177 #define TARGET_ASM_FILE_START pa_som_file_start 178 #define TARGET_ASM_INIT_SECTIONS pa_som_asm_init_sections 179 180 /* String to output before writable data. */ 181 #define DATA_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $DATA$\n" 182 183 /* String to output before uninitialized data. */ 184 #define BSS_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $BSS$\n" 185 186 /* This is how to output a command to make the user-level label 187 named NAME defined for reference from other files. We use 188 assemble_name_raw instead of assemble_name since a symbol in 189 a .IMPORT directive that isn't otherwise referenced is not 190 placed in the symbol table of the assembled object. 191 192 Failure to import a function reference can cause the HP linker 193 to segmentation fault! 194 195 Note that the SOM based tools need the symbol imported as a 196 CODE symbol, while the ELF based tools require the symbol to 197 be imported as an ENTRY symbol. */ 198 199 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \ 200 pa_hpux_asm_output_external ((FILE), (DECL), (NAME)) 201 #define ASM_OUTPUT_EXTERNAL_REAL(FILE, DECL, NAME) \ 202 do { fputs ("\t.IMPORT ", FILE); \ 203 assemble_name_raw (FILE, NAME); \ 204 if (FUNCTION_NAME_P (NAME)) \ 205 fputs (",CODE\n", FILE); \ 206 else \ 207 fputs (",DATA\n", FILE); \ 208 } while (0) 209 210 /* The bogus HP assembler requires ALL external references to be 211 "imported", even library calls. They look a bit different, so 212 here's this macro. 213 214 Also note not all libcall names are passed to pa_encode_section_info 215 (__main for example). To make sure all libcall names have section 216 info recorded in them, we do it here. 217 218 We must also ensure that a libcall that has been previously 219 exported is not subsequently imported since the HP assembler may 220 change the type from an ENTRY to a CODE symbol. This would make 221 the symbol local. We are forced to use the identifier node 222 associated with the real assembler name for this check as the 223 symbol_ref available in ASM_DECLARE_FUNCTION_NAME is not the 224 same as the one used here. As a result, we can't use flags 225 in the symbol_ref for this check. The identifier check assumes 226 assemble_external_libcall is called before the symbol is used. */ 227 228 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, RTL) \ 229 do { const char *name; \ 230 tree id; \ 231 \ 232 if (!function_label_operand (RTL, VOIDmode)) \ 233 pa_encode_label (RTL); \ 234 \ 235 name = targetm.strip_name_encoding (XSTR ((RTL), 0)); \ 236 id = maybe_get_identifier (name); \ 237 if (!id || !TREE_SYMBOL_REFERENCED (id)) \ 238 { \ 239 fputs ("\t.IMPORT ", FILE); \ 240 assemble_name_raw (FILE, XSTR ((RTL), 0)); \ 241 fputs (",CODE\n", FILE); \ 242 } \ 243 } while (0) 244 245 /* We want __gcc_plt_call to appear in every program built by 246 gcc, so we make a reference to it out of __main. 247 We use the asm statement to fool the optimizer into not 248 removing the dead (but important) initialization of 249 REFERENCE. */ 250 251 #define DO_GLOBAL_DTORS_BODY \ 252 do { \ 253 extern void __gcc_plt_call (void); \ 254 void (*reference)(void) = &__gcc_plt_call; \ 255 func_ptr *p; \ 256 __asm__ ("" : : "r" (reference)); \ 257 for (p = __DTOR_LIST__ + 1; *p; ) \ 258 (*p++) (); \ 259 } while (0) 260 261 /* This macro specifies the biggest alignment supported by the object 262 file format of this machine. 263 264 The .align directive in the HP assembler allows alignments up to 4096 265 bytes. However, the maximum alignment of a global common symbol is 8 266 bytes for objects smaller than the page size (4096 bytes). For larger 267 objects, the linker provides an alignment of 32 bytes. Unfortunately, 268 this macro doesn't provide a mechanism to test for common symbols. */ 269 #define MAX_OFILE_ALIGNMENT 32768 270 271 /* The SOM linker hardcodes paths into binaries. As a result, dotdots 272 must be removed from library prefixes to prevent binaries from depending 273 on the location of the GCC tool directory. The downside is GCC 274 cannot be moved after installation using a symlink. */ 275 #undef TARGET_ALWAYS_STRIP_DOTDOT 276 #define TARGET_ALWAYS_STRIP_DOTDOT true 277 278 /* If GAS supports weak, we can support weak when we have working linker 279 support for secondary definitions and are generating code for GAS. 280 This is primarily for one-only support as SOM doesn't allow undefined 281 weak symbols or weak aliases. */ 282 #ifdef HAVE_GAS_WEAK 283 #define TARGET_SUPPORTS_WEAK (TARGET_SOM_SDEF && TARGET_GAS) 284 #else 285 #define TARGET_SUPPORTS_WEAK 0 286 #endif 287 288 /* CVS GAS as of 4/28/04 supports a comdat parameter for the .nsubspa 289 directive. This provides one-only linkage semantics even though we 290 don't have weak support. */ 291 #ifdef HAVE_GAS_NSUBSPA_COMDAT 292 #define SUPPORTS_SOM_COMDAT (TARGET_GAS) 293 #else 294 #define SUPPORTS_SOM_COMDAT 0 295 #endif 296 297 /* We can support one only if we support weak or comdat. */ 298 #define SUPPORTS_ONE_ONLY (TARGET_SUPPORTS_WEAK || SUPPORTS_SOM_COMDAT) 299 300 /* We use DECL_COMMON for uninitialized one-only variables as we don't 301 have linkonce .bss. We use SOM secondary definitions or comdat for 302 initialized variables and functions. */ 303 #define MAKE_DECL_ONE_ONLY(DECL) \ 304 do { \ 305 if (TREE_CODE (DECL) == VAR_DECL \ 306 && (DECL_INITIAL (DECL) == 0 \ 307 || DECL_INITIAL (DECL) == error_mark_node)) \ 308 DECL_COMMON (DECL) = 1; \ 309 else if (TARGET_SUPPORTS_WEAK) \ 310 DECL_WEAK (DECL) = 1; \ 311 } while (0) 312 313 /* This is how we tell the assembler that a symbol is weak. The SOM 314 weak implementation uses the secondary definition (sdef) flag. 315 316 The behavior of sdef symbols is similar to ELF weak symbols in that 317 multiple definitions can occur without incurring a link error. 318 However, they differ in the following ways: 319 1) Undefined sdef symbols are not allowed. 320 2) The linker searches for undefined sdef symbols and will load an 321 archive library member to resolve an undefined sdef symbol. 322 3) The exported symbol from a shared library is a primary symbol 323 rather than a sdef symbol. Thus, more care is needed in the 324 ordering of libraries. 325 326 It appears that the linker discards extra copies of "weak" functions 327 when linking shared libraries, independent of whether or not they 328 are in their own section. In linking final executables, -Wl,-O can 329 be used to remove dead procedures. Thus, support for named sections 330 is not needed and in previous testing caused problems with various 331 HP tools. */ 332 #if defined HAVE_GAS_WEAK 333 #define ASM_WEAKEN_DECL(FILE,DECL,NAME,VALUE) \ 334 do \ 335 { \ 336 if ((VALUE) != NULL) \ 337 error_at (DECL_SOURCE_LOCATION (DECL), \ 338 "weak aliases are not supported"); \ 339 fputs ("\t.weak\t", FILE); \ 340 assemble_name (FILE, NAME); \ 341 fputc ('\n', FILE); \ 342 \ 343 /* Import external objects. */ \ 344 if (DECL_EXTERNAL (DECL)) \ 345 { \ 346 fputs ("\t.IMPORT ", FILE); \ 347 assemble_name (FILE, NAME); \ 348 if (TREE_CODE (DECL) == FUNCTION_DECL) \ 349 fputs (",CODE\n", FILE); \ 350 else \ 351 fputs (",DATA\n", FILE); \ 352 } \ 353 /* Functions are globalized by ASM_DECLARE_FUNCTION_NAME. */ \ 354 else if (TREE_CODE (DECL) != FUNCTION_DECL) \ 355 { \ 356 fputs ("\t.EXPORT ", FILE); \ 357 assemble_name (FILE, NAME); \ 358 fputs (",DATA\n", FILE); \ 359 } \ 360 } \ 361 while (0) 362 #endif 363 364 /* Although gas accepts .weakref, it doesn't provide the correct symbol 365 type for function references. For now, we use ASM_WEAKEN_DECL instead. 366 We have to undefine HAVE_GAS_WEAKREF to prevent default.h from defining 367 ASM_OUTPUT_WEAKREF. */ 368 #undef HAVE_GAS_WEAKREF 369 370 /* We can't handle weak aliases, and therefore can't support pragma weak. 371 Suppress the use of pragma weak in gthr-dce.h and gthr-posix.h. */ 372 #define GTHREAD_USE_WEAK 0 373 374 /* Shared library suffix. Collect2 strips the version string after 375 this suffix when generating constructor/destructor names. */ 376 #define SHLIB_SUFFIX ".sl" 377 378 /* We don't have named sections. */ 379 #define TARGET_HAVE_NAMED_SECTIONS false 380 381 #define TARGET_ASM_TM_CLONE_TABLE_SECTION pa_som_tm_clone_table_section 382 383 /* Generate specially named labels to identify DWARF 2 frame unwind 384 information. */ 385 #define EH_FRAME_THROUGH_COLLECT2 386
Indexes created Sun Mar 01 05:31:48 UTC 2026