freebsd.h revision 146909
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 GCC. 9 10GCC 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 15GCC 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 GCC; 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 146909 2005-06-03 04:19:23Z 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/* Provide a LINK_SPEC appropriate for FreeBSD. Here we provide support 34 for the special GCC options -static and -shared, which allow us to 35 link things in one of these three modes by applying the appropriate 36 combinations of options at link-time. We like to support here for 37 as many of the other GNU linker options as possible. But I don't 38 have the time to search for those flags. I am sure how to add 39 support for -soname shared_object_name. H.J. 40 41 When the -shared link option is used a final link is not being 42 done. */ 43 44#undef LINK_SPEC 45#define LINK_SPEC "\ 46 %{p:%nconsider using `-pg' instead of `-p' with gprof(1) } \ 47 %{Wl,*:%*} \ 48 %{v:-V} \ 49 %{assert*} %{R*} %{rpath*} %{defsym*} \ 50 %{shared:-Bshareable %{h*} %{soname*}} \ 51 %{!shared: \ 52 %{!static: \ 53 %{rdynamic: -export-dynamic} \ 54 %{!dynamic-linker:-dynamic-linker %(fbsd_dynamic_linker) }} \ 55 %{static:-Bstatic}} \ 56 %{symbolic:-Bsymbolic}" 57 58/* Reset our STARTFILE_SPEC which was properly set in config/freebsd.h 59 but trashed by config/<cpu>/<file.h>. */ 60 61#undef STARTFILE_SPEC 62#define STARTFILE_SPEC FBSD_STARTFILE_SPEC 63 64/* Provide an ENDFILE_SPEC appropriate for FreeBSD/i386. */ 65 66#undef ENDFILE_SPEC 67#define ENDFILE_SPEC FBSD_ENDFILE_SPEC 68 69 70/************************[ Target stuff ]***********************************/ 71 72/* Define the actual types of some ANSI-mandated types. 73 Needs to agree with <machine/ansi.h>. GCC defaults come from c-decl.c, 74 c-common.c, and config/<arch>/<arch>.h. */ 75 76#undef SIZE_TYPE 77#define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int") 78 79#undef PTRDIFF_TYPE 80#define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int") 81 82#undef WCHAR_TYPE_SIZE 83#define WCHAR_TYPE_SIZE (TARGET_64BIT ? 32 : BITS_PER_WORD) 84 85#undef SUBTARGET_EXTRA_SPECS /* i386.h bogusly defines it. */ 86#define SUBTARGET_EXTRA_SPECS \ 87 { "fbsd_dynamic_linker", FBSD_DYNAMIC_LINKER } 88 89#define TARGET_VERSION fprintf (stderr, " (i386 FreeBSD/ELF)"); 90 91#define MASK_PROFILER_EPILOGUE 010000000000 92 93#define TARGET_PROFILER_EPILOGUE (target_flags & MASK_PROFILER_EPILOGUE) 94#define TARGET_ELF 1 95 96#undef SUBTARGET_SWITCHES 97#define SUBTARGET_SWITCHES \ 98 { "profiler-epilogue", MASK_PROFILER_EPILOGUE, "Function profiler epilogue"}, \ 99 { "no-profiler-epilogue", -MASK_PROFILER_EPILOGUE, "No function profiler epilogue"}, 100 101/* This goes away when the math emulator is fixed. */ 102#undef TARGET_SUBTARGET_DEFAULT 103#define TARGET_SUBTARGET_DEFAULT \ 104 (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_NO_FANCY_MATH_387) 105 106/* Don't default to pcc-struct-return, we want to retain compatibility with 107 older gcc versions AND pcc-struct-return is nonreentrant. 108 (even though the SVR4 ABI for the i386 says that records and unions are 109 returned in memory). */ 110 111#undef DEFAULT_PCC_STRUCT_RETURN 112#define DEFAULT_PCC_STRUCT_RETURN 0 113 114/* FreeBSD sets the rounding precision of the FPU to 53 bits. Let the 115 compiler get the contents of <float.h> and std::numeric_limits correct. */ 116#undef TARGET_96_ROUND_53_LONG_DOUBLE 117#define TARGET_96_ROUND_53_LONG_DOUBLE (!TARGET_64BIT) 118 119/* Tell final.c that we don't need a label passed to mcount. */ 120#define NO_PROFILE_COUNTERS 1 121 122/* Output assembler code to FILE to begin profiling of the current function. 123 LABELNO is an optional label. */ 124 125#undef MCOUNT_NAME 126#define MCOUNT_NAME ".mcount" 127 128/* Output assembler code to FILE to end profiling of the current function. */ 129 130#undef FUNCTION_PROFILER_EPILOGUE /* BDE will need to fix this. */ 131 132 133/************************[ Assembler stuff ]********************************/ 134 135/* Override the default comment-starter of "/" from unix.h. */ 136#undef ASM_COMMENT_START 137#define ASM_COMMENT_START "#" 138 139/* Override the default comment-starter of "/APP" from unix.h. */ 140#undef ASM_APP_ON 141#define ASM_APP_ON "#APP\n" 142#undef ASM_APP_OFF 143#define ASM_APP_OFF "#NO_APP\n" 144 145/* XXX:DEO do we still need this override to defaults.h ?? */ 146/* This is how to output a reference to a user-level label named NAME. */ 147#undef ASM_OUTPUT_LABELREF 148#define ASM_OUTPUT_LABELREF(FILE, NAME) \ 149 do { \ 150 const char *xname = (NAME); \ 151 /* Hack to avoid writing lots of rtl in \ 152 FUNCTION_PROFILER_EPILOGUE (). */ \ 153 if (*xname == '.' && strcmp(xname + 1, "mexitcount") == 0) \ 154 { \ 155 if (flag_pic) \ 156 fprintf ((FILE), "*%s@GOT(%%ebx)", xname); \ 157 else \ 158 fprintf ((FILE), "%s", xname); \ 159 } \ 160 else \ 161 { \ 162 if (xname[0] == '%') \ 163 xname += 2; \ 164 if (xname[0] == '*') \ 165 xname += 1; \ 166 else \ 167 fputs (user_label_prefix, FILE); \ 168 fputs (xname, FILE); \ 169 } \ 170} while (0) 171 172/* This is how to hack on the symbol code of certain relcalcitrant 173 symbols to modify their output in output_pic_addr_const (). */ 174 175#undef ASM_HACK_SYMBOLREF_CODE /* BDE will need to fix this. */ 176 177#undef ASM_OUTPUT_ALIGN 178#define ASM_OUTPUT_ALIGN(FILE, LOG) \ 179 do { \ 180 if ((LOG)!=0) { \ 181 if (in_text_section()) \ 182 fprintf ((FILE), "\t.p2align %d,0x90\n", (LOG)); \ 183 else \ 184 fprintf ((FILE), "\t.p2align %d\n", (LOG)); \ 185 } \ 186 } while (0) 187 188/* A C statement to output to the stdio stream FILE an assembler 189 command to advance the location counter to a multiple of 1<<LOG 190 bytes if it is within MAX_SKIP bytes. 191 192 This is used to align code labels according to Intel recommendations. */ 193 194/* XXX configuration of this is broken in the same way as HAVE_GAS_SHF_MERGE, 195 but it is easier to fix in an MD way. */ 196 197#ifdef HAVE_GAS_MAX_SKIP_P2ALIGN 198#undef ASM_OUTPUT_MAX_SKIP_ALIGN 199#define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE, LOG, MAX_SKIP) \ 200 do { \ 201 if ((LOG) != 0) { \ 202 if ((MAX_SKIP) == 0) \ 203 fprintf ((FILE), "\t.p2align %d\n", (LOG)); \ 204 else \ 205 fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \ 206 } \ 207 } while (0) 208#endif 209 210/* If defined, a C expression whose value is a string containing the 211 assembler operation to identify the following data as 212 uninitialized global data. If not defined, and neither 213 `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined, 214 uninitialized global data will be output in the data section if 215 `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be 216 used. */ 217#undef BSS_SECTION_ASM_OP 218#define BSS_SECTION_ASM_OP "\t.section\t.bss" 219 220/* Like `ASM_OUTPUT_BSS' except takes the required alignment as a 221 separate, explicit argument. If you define this macro, it is used 222 in place of `ASM_OUTPUT_BSS', and gives you more flexibility in 223 handling the required alignment of the variable. The alignment is 224 specified as the number of bits. 225 226 Try to use function `asm_output_aligned_bss' defined in file 227 `varasm.c' when defining this macro. */ 228#undef ASM_OUTPUT_ALIGNED_BSS 229#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \ 230 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN) 231 232/************************[ Debugger stuff ]*********************************/ 233 234#undef DBX_REGISTER_NUMBER 235#define DBX_REGISTER_NUMBER(n) (TARGET_64BIT ? dbx64_register_map[n] \ 236 : (write_symbols == DWARF2_DEBUG \ 237 || write_symbols == DWARF_DEBUG) \ 238 ? svr4_dbx_register_map[(n)] \ 239 : dbx_register_map[(n)]) 240 241/* The same functions are used to creating the DWARF2 debug info and C++ 242 unwind info (except.c). Regardless of the debug format requested, the 243 register numbers used in exception unwinding sections still have to be 244 DWARF compatible. IMO the GCC folks may be abusing the DBX_REGISTER_NUMBER 245 macro to mean too much. */ 246#define DWARF_FRAME_REGNUM(n) (TARGET_64BIT ? dbx64_register_map[n] \ 247 : svr4_dbx_register_map[(n)]) 248 249/* stabs-in-elf has offsets relative to function beginning */ 250#undef DBX_OUTPUT_LBRAC 251#define DBX_OUTPUT_LBRAC(FILE, NAME) \ 252 do { \ 253 fprintf (asmfile, "%s %d,0,0,", ASM_STABN_OP, N_LBRAC); \ 254 assemble_name (asmfile, NAME); \ 255 fputc ('-', asmfile); \ 256 assemble_name (asmfile, \ 257 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \ 258 fprintf (asmfile, "\n"); \ 259 } while (0) 260 261#undef DBX_OUTPUT_RBRAC 262#define DBX_OUTPUT_RBRAC(FILE, NAME) \ 263 do { \ 264 fprintf (asmfile, "%s %d,0,0,", ASM_STABN_OP, N_RBRAC); \ 265 assemble_name (asmfile, NAME); \ 266 fputc ('-', asmfile); \ 267 assemble_name (asmfile, \ 268 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \ 269 fprintf (asmfile, "\n"); \ 270 } while (0) 271