som.h revision 1.1.1.3
1 /* Definitions for SOM assembler support. 2 Copyright (C) 1999-2015 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 fntype = TREE_TYPE (TREE_TYPE (DECL)); \ 103 tree tree_type = TREE_TYPE (DECL); \ 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 if (TYPE_MODE (DECL_ARG_TYPE (parm)) == SFmode \ 124 && ! TARGET_SOFT_FLOAT) \ 125 fprintf (FILE, ",ARGW%d=FR", i++); \ 126 else if (TYPE_MODE (DECL_ARG_TYPE (parm)) == DFmode \ 127 && ! TARGET_SOFT_FLOAT) \ 128 { \ 129 if (i <= 2) \ 130 { \ 131 if (i == 1) i++; \ 132 ASM_DOUBLE_ARG_DESCRIPTORS (FILE, i++, i++); \ 133 } \ 134 else \ 135 break; \ 136 } \ 137 else \ 138 { \ 139 int arg_size = \ 140 FUNCTION_ARG_SIZE (TYPE_MODE (DECL_ARG_TYPE (parm)),\ 141 DECL_ARG_TYPE (parm)); \ 142 /* Passing structs by invisible reference uses \ 143 one general register. */ \ 144 if (arg_size > 2 \ 145 || TREE_ADDRESSABLE (DECL_ARG_TYPE (parm))) \ 146 arg_size = 1; \ 147 if (arg_size == 2 && i <= 2) \ 148 { \ 149 if (i == 1) i++; \ 150 fprintf (FILE, ",ARGW%d=GR", i++); \ 151 fprintf (FILE, ",ARGW%d=GR", i++); \ 152 } \ 153 else if (arg_size == 1) \ 154 fprintf (FILE, ",ARGW%d=GR", i++); \ 155 else \ 156 i += arg_size; \ 157 } \ 158 } \ 159 /* anonymous args */ \ 160 if (stdarg_p (tree_type)) \ 161 { \ 162 for (; i < 4; i++) \ 163 fprintf (FILE, ",ARGW%d=GR", i); \ 164 } \ 165 if (TYPE_MODE (fntype) == DFmode && ! TARGET_SOFT_FLOAT) \ 166 fputs (DFMODE_RETURN_STRING, FILE); \ 167 else if (TYPE_MODE (fntype) == SFmode && ! TARGET_SOFT_FLOAT) \ 168 fputs (SFMODE_RETURN_STRING, FILE); \ 169 else if (fntype != void_type_node) \ 170 fputs (",RTNVAL=GR", FILE); \ 171 fputs ("\n", FILE); \ 172 }} while (0) 173 174 #define TARGET_ASM_FILE_START pa_som_file_start 175 #define TARGET_ASM_INIT_SECTIONS pa_som_asm_init_sections 176 177 /* String to output before writable data. */ 178 #define DATA_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $DATA$\n" 179 180 /* String to output before uninitialized data. */ 181 #define BSS_SECTION_ASM_OP "\t.SPACE $PRIVATE$\n\t.SUBSPA $BSS$\n" 182 183 /* This is how to output a command to make the user-level label 184 named NAME defined for reference from other files. We use 185 assemble_name_raw instead of assemble_name since a symbol in 186 a .IMPORT directive that isn't otherwise referenced is not 187 placed in the symbol table of the assembled object. 188 189 Failure to import a function reference can cause the HP linker 190 to segmentation fault! 191 192 Note that the SOM based tools need the symbol imported as a 193 CODE symbol, while the ELF based tools require the symbol to 194 be imported as an ENTRY symbol. */ 195 196 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \ 197 pa_hpux_asm_output_external ((FILE), (DECL), (NAME)) 198 #define ASM_OUTPUT_EXTERNAL_REAL(FILE, DECL, NAME) \ 199 do { fputs ("\t.IMPORT ", FILE); \ 200 assemble_name_raw (FILE, NAME); \ 201 if (FUNCTION_NAME_P (NAME)) \ 202 fputs (",CODE\n", FILE); \ 203 else \ 204 fputs (",DATA\n", FILE); \ 205 } while (0) 206 207 /* The bogus HP assembler requires ALL external references to be 208 "imported", even library calls. They look a bit different, so 209 here's this macro. 210 211 Also note not all libcall names are passed to pa_encode_section_info 212 (__main for example). To make sure all libcall names have section 213 info recorded in them, we do it here. 214 215 We must also ensure that a libcall that has been previously 216 exported is not subsequently imported since the HP assembler may 217 change the type from an ENTRY to a CODE symbol. This would make 218 the symbol local. We are forced to use the identifier node 219 associated with the real assembler name for this check as the 220 symbol_ref available in ASM_DECLARE_FUNCTION_NAME is not the 221 same as the one used here. As a result, we can't use flags 222 in the symbol_ref for this check. The identifier check assumes 223 assemble_external_libcall is called before the symbol is used. */ 224 225 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, RTL) \ 226 do { const char *name; \ 227 tree id; \ 228 \ 229 if (!function_label_operand (RTL, VOIDmode)) \ 230 pa_encode_label (RTL); \ 231 \ 232 name = targetm.strip_name_encoding (XSTR ((RTL), 0)); \ 233 id = maybe_get_identifier (name); \ 234 if (!id || !TREE_SYMBOL_REFERENCED (id)) \ 235 { \ 236 fputs ("\t.IMPORT ", FILE); \ 237 assemble_name_raw (FILE, XSTR ((RTL), 0)); \ 238 fputs (",CODE\n", FILE); \ 239 } \ 240 } while (0) 241 242 /* We want __gcc_plt_call to appear in every program built by 243 gcc, so we make a reference to it out of __main. 244 We use the asm statement to fool the optimizer into not 245 removing the dead (but important) initialization of 246 REFERENCE. */ 247 248 #define DO_GLOBAL_DTORS_BODY \ 249 do { \ 250 extern void __gcc_plt_call (void); \ 251 void (*reference)(void) = &__gcc_plt_call; \ 252 func_ptr *p; \ 253 __asm__ ("" : : "r" (reference)); \ 254 for (p = __DTOR_LIST__ + 1; *p; ) \ 255 (*p++) (); \ 256 } while (0) 257 258 /* This macro specifies the biggest alignment supported by the object 259 file format of this machine. 260 261 The .align directive in the HP assembler allows alignments up to 4096 262 bytes. However, the maximum alignment of a global common symbol is 8 263 bytes for objects smaller than the page size (4096 bytes). For larger 264 objects, the linker provides an alignment of 32 bytes. Unfortunately, 265 this macro doesn't provide a mechanism to test for common symbols. */ 266 #define MAX_OFILE_ALIGNMENT 32768 267 268 /* The SOM linker hardcodes paths into binaries. As a result, dotdots 269 must be removed from library prefixes to prevent binaries from depending 270 on the location of the GCC tool directory. The downside is GCC 271 cannot be moved after installation using a symlink. */ 272 #undef TARGET_ALWAYS_STRIP_DOTDOT 273 #define TARGET_ALWAYS_STRIP_DOTDOT true 274 275 /* If GAS supports weak, we can support weak when we have working linker 276 support for secondary definitions and are generating code for GAS. 277 This is primarily for one-only support as SOM doesn't allow undefined 278 weak symbols. */ 279 #ifdef HAVE_GAS_WEAK 280 #define TARGET_SUPPORTS_WEAK (TARGET_SOM_SDEF && TARGET_GAS) 281 #else 282 #define TARGET_SUPPORTS_WEAK 0 283 #endif 284 285 /* CVS GAS as of 4/28/04 supports a comdat parameter for the .nsubspa 286 directive. This provides one-only linkage semantics even though we 287 don't have weak support. */ 288 #ifdef HAVE_GAS_NSUBSPA_COMDAT 289 #define SUPPORTS_SOM_COMDAT (TARGET_GAS) 290 #else 291 #define SUPPORTS_SOM_COMDAT 0 292 #endif 293 294 /* We can support one only if we support weak or comdat. */ 295 #define SUPPORTS_ONE_ONLY (TARGET_SUPPORTS_WEAK || SUPPORTS_SOM_COMDAT) 296 297 /* We use DECL_COMMON for uninitialized one-only variables as we don't 298 have linkonce .bss. We use SOM secondary definitions or comdat for 299 initialized variables and functions. */ 300 #define MAKE_DECL_ONE_ONLY(DECL) \ 301 do { \ 302 if (TREE_CODE (DECL) == VAR_DECL \ 303 && (DECL_INITIAL (DECL) == 0 \ 304 || DECL_INITIAL (DECL) == error_mark_node)) \ 305 DECL_COMMON (DECL) = 1; \ 306 else if (TARGET_SUPPORTS_WEAK) \ 307 DECL_WEAK (DECL) = 1; \ 308 } while (0) 309 310 /* This is how we tell the assembler that a symbol is weak. The SOM 311 weak implementation uses the secondary definition (sdef) flag. 312 313 The behavior of sdef symbols is similar to ELF weak symbols in that 314 multiple definitions can occur without incurring a link error. 315 However, they differ in the following ways: 316 1) Undefined sdef symbols are not allowed. 317 2) The linker searches for undefined sdef symbols and will load an 318 archive library member to resolve an undefined sdef symbol. 319 3) The exported symbol from a shared library is a primary symbol 320 rather than a sdef symbol. Thus, more care is needed in the 321 ordering of libraries. 322 323 It appears that the linker discards extra copies of "weak" functions 324 when linking shared libraries, independent of whether or not they 325 are in their own section. In linking final executables, -Wl,-O can 326 be used to remove dead procedures. Thus, support for named sections 327 is not needed and in previous testing caused problems with various 328 HP tools. */ 329 #define ASM_WEAKEN_LABEL(FILE,NAME) \ 330 do { fputs ("\t.weak\t", FILE); \ 331 assemble_name (FILE, NAME); \ 332 fputc ('\n', FILE); \ 333 targetm.asm_out.globalize_label (FILE, NAME); \ 334 } while (0) 335 336 /* We can't handle weak aliases, and therefore can't support pragma weak. 337 Suppress the use of pragma weak in gthr-dce.h and gthr-posix.h. */ 338 #define GTHREAD_USE_WEAK 0 339 340 /* Shared library suffix. Collect2 strips the version string after 341 this suffix when generating constructor/destructor names. */ 342 #define SHLIB_SUFFIX ".sl" 343 344 #define TARGET_HAVE_NAMED_SECTIONS false 345 346 #define TARGET_ASM_TM_CLONE_TABLE_SECTION pa_som_tm_clone_table_section 347
Indexes created Sun Mar 01 05:31:48 UTC 2026