freebsd.h revision 117418
1/* Definitions for Intel 386 running FreeBSD with ELF format 2 Copyright (C) 1996, 2000, 2002 Free Software Foundation, Inc. 3 Contributed by Eric Youngdale. 4 Modified for stabs-in-ELF by H.J. Lu. 5 Adapted from GNU/Linux version by John Polstra. 6 Continued development by David O'Brien <obrien@freebsd.org> 7 8This file is part of GNU CC. 9 10GNU CC is free software; you can redistribute it and/or modify 11it under the terms of the GNU General Public License as published by 12the Free Software Foundation; either version 2, or (at your option) 13any later version. 14 15GNU CC is distributed in the hope that it will be useful, 16but WITHOUT ANY WARRANTY; without even the implied warranty of 17MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18GNU General Public License for more details. 19 20You should have received a copy of the GNU General Public License 21along with GNU CC; see the file COPYING. If not, write to 22the Free Software Foundation, 59 Temple Place - Suite 330, 23Boston, MA 02111-1307, USA. */ 24 25/* $FreeBSD: head/contrib/gcc/config/i386/freebsd.h 117418 2003-07-11 05:03:47Z kan $ */ 26 27#undef CC1_SPEC 28#define CC1_SPEC "%(cc1_cpu) %{profile:-p}" 29 30#undef ASM_SPEC 31#define ASM_SPEC "%{v*: -v}" 32 33#undef ASM_FINAL_SPEC 34#define ASM_FINAL_SPEC "%|" 35 36/* Provide a LINK_SPEC appropriate for FreeBSD. Here we provide support 37 for the special GCC options -static and -shared, which allow us to 38 link things in one of these three modes by applying the appropriate 39 combinations of options at link-time. We like to support here for 40 as many of the other GNU linker options as possible. But I don't 41 have the time to search for those flags. I am sure how to add 42 support for -soname shared_object_name. H.J. 43 44 When the -shared link option is used a final link is not being 45 done. */ 46 47#undef LINK_SPEC 48#define LINK_SPEC "\ 49 %{p:%nconsider using `-pg' instead of `-p' with gprof(1) } \ 50 %{Wl,*:%*} \ 51 %{v:-V} \ 52 %{assert*} %{R*} %{rpath*} %{defsym*} \ 53 %{shared:-Bshareable %{h*} %{soname*}} \ 54 %{!shared: \ 55 %{!static: \ 56 %{rdynamic: -export-dynamic} \ 57 %{!dynamic-linker: -dynamic-linker /usr/libexec/ld-elf.so.1}} \ 58 %{static:-Bstatic}} \ 59 %{symbolic:-Bsymbolic}" 60 61/* Provide a STARTFILE_SPEC appropriate for FreeBSD. Here we add the magical 62 crtbegin.o file (see crtstuff.c) which provides part of the support for 63 getting C++ file-scope static object constructed before entering `main'. */ 64 65#undef STARTFILE_SPEC 66#define STARTFILE_SPEC "\ 67 %{!shared: \ 68 %{pg:gcrt1.o%s} \ 69 %{!pg: \ 70 %{p:gcrt1.o%s} \ 71 %{!p:crt1.o%s}}} \ 72 crti.o%s \ 73 %{!shared:crtbegin.o%s} \ 74 %{shared:crtbeginS.o%s}" 75 76/* Provide an ENDFILE_SPEC appropriate for FreeBSD/i386. Here we tack on our 77 own magical crtend.o file (see crtstuff.c) which provides part of the 78 support for getting C++ file-scope static object constructed before 79 entering `main', followed by the normal "finalizer" file, `crtn.o'. */ 80 81#undef ENDFILE_SPEC 82#define ENDFILE_SPEC "\ 83 %{!shared:crtend.o%s} \ 84 %{shared:crtendS.o%s} crtn.o%s" 85 86 87/************************[ Target stuff ]***********************************/ 88 89/* Define the actual types of some ANSI-mandated types. 90 Needs to agree with <machine/ansi.h>. GCC defaults come from c-decl.c, 91 c-common.c, and config/<arch>/<arch>.h. */ 92 93#undef SIZE_TYPE 94#define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int") 95 96#undef PTRDIFF_TYPE 97#define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int") 98 99#undef WCHAR_TYPE_SIZE 100#define WCHAR_TYPE_SIZE (TARGET_64BIT ? 32 : BITS_PER_WORD) 101 102#define TARGET_VERSION fprintf (stderr, " (i386 FreeBSD/ELF)"); 103 104#define MASK_PROFILER_EPILOGUE 010000000000 105 106#define TARGET_PROFILER_EPILOGUE (target_flags & MASK_PROFILER_EPILOGUE) 107#define TARGET_ELF 1 108 109#undef SUBTARGET_SWITCHES 110#define SUBTARGET_SWITCHES \ 111 { "profiler-epilogue", MASK_PROFILER_EPILOGUE, "Function profiler epilogue"}, \ 112 { "no-profiler-epilogue", -MASK_PROFILER_EPILOGUE, "No function profiler epilogue"}, 113 114/* This goes away when the math emulator is fixed. */ 115#undef TARGET_SUBTARGET_DEFAULT 116#define TARGET_SUBTARGET_DEFAULT \ 117 (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_NO_FANCY_MATH_387) 118 119/* Don't default to pcc-struct-return, we want to retain compatibility with 120 older gcc versions AND pcc-struct-return is nonreentrant. 121 (even though the SVR4 ABI for the i386 says that records and unions are 122 returned in memory). */ 123 124#undef DEFAULT_PCC_STRUCT_RETURN 125#define DEFAULT_PCC_STRUCT_RETURN 0 126 127/* FreeBSD sets the rounding precision of the FPU to 53 bits. Let the 128 compiler get the contents of <float.h> and std::numeric_limits correct. */ 129#define SUBTARGET_OVERRIDE_OPTIONS \ 130 do { \ 131 real_format_for_mode[XFmode - QFmode] \ 132 = &ieee_extended_intel_96_round_53_format; \ 133 real_format_for_mode[TFmode - QFmode] \ 134 = &ieee_extended_intel_96_round_53_format; \ 135 } while (0) 136 137/* Tell final.c that we don't need a label passed to mcount. */ 138#define NO_PROFILE_COUNTERS 1 139 140/* Output assembler code to FILE to begin profiling of the current function. 141 LABELNO is an optional label. */ 142 143#undef MCOUNT_NAME 144#define MCOUNT_NAME ".mcount" 145 146/* Output assembler code to FILE to end profiling of the current function. */ 147 148#undef FUNCTION_PROFILER_EPILOGUE /* BDE will need to fix this. */ 149 150 151/************************[ Assembler stuff ]********************************/ 152 153/* Override the default comment-starter of "/" from unix.h. */ 154#undef ASM_COMMENT_START 155#define ASM_COMMENT_START "#" 156 157/* Override the default comment-starter of "/APP" from unix.h. */ 158#undef ASM_APP_ON 159#define ASM_APP_ON "#APP\n" 160#undef ASM_APP_OFF 161#define ASM_APP_OFF "#NO_APP\n" 162 163/* XXX:DEO do we still need this override to defaults.h ?? */ 164/* This is how to output a reference to a user-level label named NAME. */ 165#undef ASM_OUTPUT_LABELREF 166#define ASM_OUTPUT_LABELREF(FILE, NAME) \ 167 do { \ 168 char *_name = (NAME); \ 169 /* Hack to avoid writing lots of rtl in \ 170 FUNCTION_PROFILER_EPILOGUE (). */ \ 171 if (*_name == '.' && strcmp(_name + 1, "mexitcount") == 0) \ 172 { \ 173 if (flag_pic) \ 174 fprintf ((FILE), "*%s@GOT(%%ebx)", _name); \ 175 else \ 176 fprintf ((FILE), "%s", _name); \ 177 } \ 178 else \ 179 fprintf (FILE, "%s", _name); \ 180} while (0) 181 182/* This is how to hack on the symbol code of certain relcalcitrant 183 symbols to modify their output in output_pic_addr_const (). */ 184 185#undef ASM_HACK_SYMBOLREF_CODE /* BDE will need to fix this. */ 186 187#undef ASM_OUTPUT_ALIGN 188#define ASM_OUTPUT_ALIGN(FILE, LOG) \ 189 do { \ 190 if ((LOG)!=0) { \ 191 if (in_text_section()) \ 192 fprintf ((FILE), "\t.p2align %d,0x90\n", (LOG)); \ 193 else \ 194 fprintf ((FILE), "\t.p2align %d\n", (LOG)); \ 195 } \ 196 } while (0) 197 198/* A C statement to output to the stdio stream FILE an assembler 199 command to advance the location counter to a multiple of 1<<LOG 200 bytes if it is within MAX_SKIP bytes. 201 202 This is used to align code labels according to Intel recommendations. */ 203 204/* XXX configuration of this is broken in the same way as HAVE_GAS_SHF_MERGE, 205 but it is easier to fix in an MD way. */ 206 207#ifdef HAVE_GAS_MAX_SKIP_P2ALIGN 208#define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE, LOG, MAX_SKIP) \ 209 do { \ 210 if ((LOG) != 0) { \ 211 if ((MAX_SKIP) == 0) \ 212 fprintf ((FILE), "\t.p2align %d\n", (LOG)); \ 213 else \ 214 fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \ 215 } \ 216 } while (0) 217#endif 218 219/* If defined, a C expression whose value is a string containing the 220 assembler operation to identify the following data as 221 uninitialized global data. If not defined, and neither 222 `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined, 223 uninitialized global data will be output in the data section if 224 `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be 225 used. */ 226#undef BSS_SECTION_ASM_OP 227#define BSS_SECTION_ASM_OP "\t.section\t.bss" 228 229/* Like `ASM_OUTPUT_BSS' except takes the required alignment as a 230 separate, explicit argument. If you define this macro, it is used 231 in place of `ASM_OUTPUT_BSS', and gives you more flexibility in 232 handling the required alignment of the variable. The alignment is 233 specified as the number of bits. 234 235 Try to use function `asm_output_aligned_bss' defined in file 236 `varasm.c' when defining this macro. */ 237#undef ASM_OUTPUT_ALIGNED_BSS 238#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \ 239 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN) 240 241/************************[ Debugger stuff ]*********************************/ 242 243#undef DBX_REGISTER_NUMBER 244#define DBX_REGISTER_NUMBER(n) (TARGET_64BIT ? dbx64_register_map[n] \ 245 : (write_symbols == DWARF2_DEBUG \ 246 || write_symbols == DWARF_DEBUG) \ 247 ? svr4_dbx_register_map[(n)] \ 248 : dbx_register_map[(n)]) 249 250/* The same functions are used to creating the DWARF2 debug info and C++ 251 unwind info (except.c). Regardless of the debug format requested, the 252 register numbers used in exception unwinding sections still have to be 253 DWARF compatible. IMO the GCC folks may be abusing the DBX_REGISTER_NUMBER 254 macro to mean too much. */ 255#define DWARF_FRAME_REGNUM(n) (TARGET_64BIT ? dbx64_register_map[n] \ 256 : svr4_dbx_register_map[(n)]) 257 258/* stabs-in-elf has offsets relative to function beginning */ 259#undef DBX_OUTPUT_LBRAC 260#define DBX_OUTPUT_LBRAC(FILE, NAME) \ 261 do { \ 262 fprintf (asmfile, "%s %d,0,0,", ASM_STABN_OP, N_LBRAC); \ 263 assemble_name (asmfile, buf); \ 264 fputc ('-', asmfile); \ 265 assemble_name (asmfile, \ 266 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \ 267 fprintf (asmfile, "\n"); \ 268 } while (0) 269 270#undef DBX_OUTPUT_RBRAC 271#define DBX_OUTPUT_RBRAC(FILE, NAME) \ 272 do { \ 273 fprintf (asmfile, "%s %d,0,0,", ASM_STABN_OP, N_RBRAC); \ 274 assemble_name (asmfile, buf); \ 275 fputc ('-', asmfile); \ 276 assemble_name (asmfile, \ 277 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \ 278 fprintf (asmfile, "\n"); \ 279 } while (0) 280