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) \ 101 do { tree tree_type = TREE_TYPE (DECL); \ 102 tree fntype = TREE_TYPE (tree_type); \ 103 tree parm; \ 104 int i; \ 105 if (TREE_PUBLIC (DECL) || TARGET_GAS) \ 106 { \ 107 if (TREE_PUBLIC (DECL)) \ 108 { \ 109 fputs ("\t.EXPORT ", FILE); \ 110 assemble_name (FILE, NAME); \ 111 fputs (",ENTRY,PRIV_LEV=3", FILE); \ 112 } \ 113 else \ 114 { \ 115 fputs ("\t.PARAM ", FILE); \ 116 assemble_name (FILE, NAME); \ 117 fputs (",PRIV_LEV=3", FILE); \ 118 } \ 119 for (parm = DECL_ARGUMENTS (DECL), i = 0; parm && i < 4; \ 120 parm = DECL_CHAIN (parm)) \ 121 { \ 122 tree type = DECL_ARG_TYPE (parm); \ 123 machine_mode mode = TYPE_MODE (type); \ 124 if (!AGGREGATE_TYPE_P (type) \ 125 && mode == SFmode && ! TARGET_SOFT_FLOAT) \ 126 fprintf (FILE, ",ARGW%d=FR", i++); \ 127 else if (!AGGREGATE_TYPE_P (type) \ 128 && mode == DFmode && ! TARGET_SOFT_FLOAT) \ 129 { \ 130 if (i <= 2) \ 131 { \ 132 if (i == 1) i++; \ 133 ASM_DOUBLE_ARG_DESCRIPTORS (FILE, i++, i++); \ 134 } \ 135 else \ 136 break; \ 137 } \ 138 else \ 139 { \ 140 int arg_size = pa_function_arg_size (mode, type); \ 141 /* Passing structs by invisible reference uses \ 142 one general register. */ \ 143 if (arg_size > 2 || TREE_ADDRESSABLE (type)) \ 144 arg_size = 1; \ 145 if (arg_size == 2 && i <= 2) \ 146 { \ 147 if (i == 1) i++; \ 148 fprintf (FILE, ",ARGW%d=GR", i++); \ 149 fprintf (FILE, ",ARGW%d=GR", i++); \ 150 } \ 151 else if (arg_size == 1) \ 152 fprintf (FILE, ",ARGW%d=GR", i++); \ 153 else \ 154 i += arg_size; \ 155 } \ 156 } \ 157 /* anonymous args */ \ 158 if (stdarg_p (tree_type)) \ 159 { \ 160 for (; i < 4; i++) \ 161 fprintf (FILE, ",ARGW%d=GR", i); \ 162 } \ 163 if (!AGGREGATE_TYPE_P (fntype) \ 164 && TYPE_MODE (fntype) == DFmode \ 165 && ! TARGET_SOFT_FLOAT) \ 166 fputs (DFMODE_RETURN_STRING, FILE); \ 167 else if (!AGGREGATE_TYPE_P (fntype) \ 168 && TYPE_MODE (fntype) == SFmode \ 169 && ! TARGET_SOFT_FLOAT) \ 170 fputs (SFMODE_RETURN_STRING, FILE); \ 171 else if (fntype != void_type_node) \ 172 fputs (",RTNVAL=GR", FILE); \ 173 fputs ("\n", FILE); \ 174 }} while (0) 175 176 #define TARGET_ASM_FILE_START pa_som_file_start 177 #define TARGET_ASM_INIT_SECTIONS pa_som_asm_init_sections 178 179 /* String to output before writable data. */ 180 #define DATA_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $DATA$\n" 181 182 /* String to output before uninitialized data. */ 183 #define BSS_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $BSS$\n" 184 185 /* This is how to output a command to make the user-level label 186 named NAME defined for reference from other files. We use 187 assemble_name_raw instead of assemble_name since a symbol in 188 a .IMPORT directive that isn't otherwise referenced is not 189 placed in the symbol table of the assembled object. 190 191 Failure to import a function reference can cause the HP linker 192 to segmentation fault! 193 194 Note that the SOM based tools need the symbol imported as a 195 CODE symbol, while the ELF based tools require the symbol to 196 be imported as an ENTRY symbol. */ 197 198 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \ 199 pa_hpux_asm_output_external ((FILE), (DECL), (NAME)) 200 #define ASM_OUTPUT_EXTERNAL_REAL(FILE, DECL, NAME) \ 201 do { fputs ("\t.IMPORT ", FILE); \ 202 assemble_name_raw (FILE, NAME); \ 203 if (FUNCTION_NAME_P (NAME)) \ 204 fputs (",CODE\n", FILE); \ 205 else \ 206 fputs (",DATA\n", FILE); \ 207 } while (0) 208 209 /* The bogus HP assembler requires ALL external references to be 210 "imported", even library calls. They look a bit different, so 211 here's this macro. 212 213 Also note not all libcall names are passed to pa_encode_section_info 214 (__main for example). To make sure all libcall names have section 215 info recorded in them, we do it here. 216 217 We must also ensure that a libcall that has been previously 218 exported is not subsequently imported since the HP assembler may 219 change the type from an ENTRY to a CODE symbol. This would make 220 the symbol local. We are forced to use the identifier node 221 associated with the real assembler name for this check as the 222 symbol_ref available in ASM_DECLARE_FUNCTION_NAME is not the 223 same as the one used here. As a result, we can't use flags 224 in the symbol_ref for this check. The identifier check assumes 225 assemble_external_libcall is called before the symbol is used. */ 226 227 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, RTL) \ 228 do { const char *name; \ 229 tree id; \ 230 \ 231 if (!function_label_operand (RTL, VOIDmode)) \ 232 pa_encode_label (RTL); \ 233 \ 234 name = targetm.strip_name_encoding (XSTR ((RTL), 0)); \ 235 id = maybe_get_identifier (name); \ 236 if (!id || !TREE_SYMBOL_REFERENCED (id)) \ 237 { \ 238 fputs ("\t.IMPORT ", FILE); \ 239 assemble_name_raw (FILE, XSTR ((RTL), 0)); \ 240 fputs (",CODE\n", FILE); \ 241 } \ 242 } while (0) 243 244 /* We want __gcc_plt_call to appear in every program built by 245 gcc, so we make a reference to it out of __main. 246 We use the asm statement to fool the optimizer into not 247 removing the dead (but important) initialization of 248 REFERENCE. */ 249 250 #define DO_GLOBAL_DTORS_BODY \ 251 do { \ 252 extern void __gcc_plt_call (void); \ 253 void (*reference)(void) = &__gcc_plt_call; \ 254 func_ptr *p; \ 255 __asm__ ("" : : "r" (reference)); \ 256 for (p = __DTOR_LIST__ + 1; *p; ) \ 257 (*p++) (); \ 258 } while (0) 259 260 /* This macro specifies the biggest alignment supported by the object 261 file format of this machine. 262 263 The .align directive in the HP assembler allows alignments up to 4096 264 bytes. However, the maximum alignment of a global common symbol is 8 265 bytes for objects smaller than the page size (4096 bytes). For larger 266 objects, the linker provides an alignment of 32 bytes. Unfortunately, 267 this macro doesn't provide a mechanism to test for common symbols. */ 268 #define MAX_OFILE_ALIGNMENT 32768 269 270 /* The SOM linker hardcodes paths into binaries. As a result, dotdots 271 must be removed from library prefixes to prevent binaries from depending 272 on the location of the GCC tool directory. The downside is GCC 273 cannot be moved after installation using a symlink. */ 274 #undef TARGET_ALWAYS_STRIP_DOTDOT 275 #define TARGET_ALWAYS_STRIP_DOTDOT true 276 277 /* If GAS supports weak, we can support weak when we have working linker 278 support for secondary definitions and are generating code for GAS. 279 This is primarily for one-only support as SOM doesn't allow undefined 280 weak symbols or weak aliases. */ 281 #ifdef HAVE_GAS_WEAK 282 #define TARGET_SUPPORTS_WEAK (TARGET_SOM_SDEF && TARGET_GAS) 283 #else 284 #define TARGET_SUPPORTS_WEAK 0 285 #endif 286 287 /* CVS GAS as of 4/28/04 supports a comdat parameter for the .nsubspa 288 directive. This provides one-only linkage semantics even though we 289 don't have weak support. */ 290 #ifdef HAVE_GAS_NSUBSPA_COMDAT 291 #define SUPPORTS_SOM_COMDAT (TARGET_GAS) 292 #else 293 #define SUPPORTS_SOM_COMDAT 0 294 #endif 295 296 /* We can support one only if we support weak or comdat. */ 297 #define SUPPORTS_ONE_ONLY (TARGET_SUPPORTS_WEAK || SUPPORTS_SOM_COMDAT) 298 299 /* We use DECL_COMMON for uninitialized one-only variables as we don't 300 have linkonce .bss. We use SOM secondary definitions or comdat for 301 initialized variables and functions. */ 302 #define MAKE_DECL_ONE_ONLY(DECL) \ 303 do { \ 304 if (TREE_CODE (DECL) == VAR_DECL \ 305 && (DECL_INITIAL (DECL) == 0 \ 306 || DECL_INITIAL (DECL) == error_mark_node)) \ 307 DECL_COMMON (DECL) = 1; \ 308 else if (TARGET_SUPPORTS_WEAK) \ 309 DECL_WEAK (DECL) = 1; \ 310 } while (0) 311 312 /* This is how we tell the assembler that a symbol is weak. The SOM 313 weak implementation uses the secondary definition (sdef) flag. 314 315 The behavior of sdef symbols is similar to ELF weak symbols in that 316 multiple definitions can occur without incurring a link error. 317 However, they differ in the following ways: 318 1) Undefined sdef symbols are not allowed. 319 2) The linker searches for undefined sdef symbols and will load an 320 archive library member to resolve an undefined sdef symbol. 321 3) The exported symbol from a shared library is a primary symbol 322 rather than a sdef symbol. Thus, more care is needed in the 323 ordering of libraries. 324 325 It appears that the linker discards extra copies of "weak" functions 326 when linking shared libraries, independent of whether or not they 327 are in their own section. In linking final executables, -Wl,-O can 328 be used to remove dead procedures. Thus, support for named sections 329 is not needed and in previous testing caused problems with various 330 HP tools. */ 331 #if defined HAVE_GAS_WEAK 332 #define ASM_WEAKEN_DECL(FILE,DECL,NAME,VALUE) \ 333 do \ 334 { \ 335 if ((VALUE) != NULL) \ 336 error_at (DECL_SOURCE_LOCATION (DECL), \ 337 "weak aliases are not supported"); \ 338 fputs ("\t.weak\t", FILE); \ 339 assemble_name (FILE, NAME); \ 340 fputc ('\n', FILE); \ 341 \ 342 /* Import external objects. */ \ 343 if (DECL_EXTERNAL (DECL)) \ 344 { \ 345 fputs ("\t.IMPORT ", FILE); \ 346 assemble_name (FILE, NAME); \ 347 if (TREE_CODE (DECL) == FUNCTION_DECL) \ 348 fputs (",CODE\n", FILE); \ 349 else \ 350 fputs (",DATA\n", FILE); \ 351 } \ 352 /* Functions are globalized by ASM_DECLARE_FUNCTION_NAME. */ \ 353 else if (TREE_CODE (DECL) != FUNCTION_DECL) \ 354 { \ 355 fputs ("\t.EXPORT ", FILE); \ 356 assemble_name (FILE, NAME); \ 357 fputs (",DATA\n", FILE); \ 358 } \ 359 } \ 360 while (0) 361 #endif 362 363 /* Although gas accepts .weakref, it doesn't provide the correct symbol 364 type for function references. For now, we use ASM_WEAKEN_DECL instead. 365 We have to undefine HAVE_GAS_WEAKREF to prevent default.h from defining 366 ASM_OUTPUT_WEAKREF. */ 367 #undef HAVE_GAS_WEAKREF 368 369 /* We can't handle weak aliases, and therefore can't support pragma weak. 370 Suppress the use of pragma weak in gthr-dce.h and gthr-posix.h. */ 371 #define GTHREAD_USE_WEAK 0 372 373 /* Shared library suffix. Collect2 strips the version string after 374 this suffix when generating constructor/destructor names. */ 375 #define SHLIB_SUFFIX ".sl" 376 377 /* We don't have named sections. */ 378 #define TARGET_HAVE_NAMED_SECTIONS false 379 380 #define TARGET_ASM_TM_CLONE_TABLE_SECTION pa_som_tm_clone_table_section 381 382 /* Generate specially named labels to identify DWARF 2 frame unwind 383 information. */ 384 #define EH_FRAME_THROUGH_COLLECT2 385