freebsd.h revision 180078
1/* Definitions for Intel 386 running FreeBSD with ELF format 2 Copyright (C) 1996, 2000, 2002, 2004 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, 51 Franklin Street, Fifth Floor, 23Boston, MA 02110-1301, USA. */ 24 25/* $FreeBSD: head/contrib/gcc/config/i386/freebsd.h 180078 2008-06-28 15:17:02Z obrien $ */ 26 27#undef CC1_SPEC 28#define CC1_SPEC "%(cc1_cpu) %{profile:-p}" 29 30/* Provide a LINK_SPEC appropriate for FreeBSD. Here we provide support 31 for the special GCC options -static and -shared, which allow us to 32 link things in one of these three modes by applying the appropriate 33 combinations of options at link-time. We like to support here for 34 as many of the other GNU linker options as possible. But I don't 35 have the time to search for those flags. I am sure how to add 36 support for -soname shared_object_name. H.J. 37 38 When the -shared link option is used a final link is not being 39 done. */ 40 41#undef LINK_SPEC 42#define LINK_SPEC "\ 43 %{p:%nconsider using `-pg' instead of `-p' with gprof(1) } \ 44 %{v:-V} \ 45 %{assert*} %{R*} %{rpath*} %{defsym*} \ 46 %{shared:-Bshareable %{h*} %{soname*}} \ 47 %{!shared: \ 48 %{!static: \ 49 %{rdynamic: -export-dynamic} \ 50 %{!dynamic-linker:-dynamic-linker %(fbsd_dynamic_linker) }} \ 51 %{static:-Bstatic}} \ 52 %{symbolic:-Bsymbolic}" 53 54/* Reset our STARTFILE_SPEC which was properly set in config/freebsd.h 55 but trashed by config/<cpu>/<file.h>. */ 56 57#undef STARTFILE_SPEC 58#define STARTFILE_SPEC FBSD_STARTFILE_SPEC 59 60/* Provide an ENDFILE_SPEC appropriate for FreeBSD/i386. */ 61 62#undef ENDFILE_SPEC 63#define ENDFILE_SPEC FBSD_ENDFILE_SPEC 64 65 66/************************[ Target stuff ]***********************************/ 67 68/* Define the actual types of some ANSI-mandated types. 69 Needs to agree with <machine/ansi.h>. GCC defaults come from c-decl.c, 70 c-common.c, and config/<arch>/<arch>.h. */ 71 72#undef SIZE_TYPE 73#define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int") 74 75#undef PTRDIFF_TYPE 76#define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int") 77 78#undef WCHAR_TYPE_SIZE 79#define WCHAR_TYPE_SIZE (TARGET_64BIT ? 32 : BITS_PER_WORD) 80 81#undef SUBTARGET_EXTRA_SPECS /* i386.h bogusly defines it. */ 82#define SUBTARGET_EXTRA_SPECS \ 83 { "fbsd_dynamic_linker", FBSD_DYNAMIC_LINKER } 84 85#define TARGET_VERSION fprintf (stderr, " (i386 FreeBSD/ELF)"); 86 87#define TARGET_ELF 1 88 89/* This goes away when the math emulator is fixed. */ 90#undef TARGET_SUBTARGET_DEFAULT 91#define TARGET_SUBTARGET_DEFAULT \ 92 (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_NO_FANCY_MATH_387) 93 94/* Don't default to pcc-struct-return, we want to retain compatibility with 95 older gcc versions AND pcc-struct-return is nonreentrant. 96 (even though the SVR4 ABI for the i386 says that records and unions are 97 returned in memory). */ 98 99#undef DEFAULT_PCC_STRUCT_RETURN 100#define DEFAULT_PCC_STRUCT_RETURN 0 101 102/* FreeBSD sets the rounding precision of the FPU to 53 bits. Let the 103 compiler get the contents of <float.h> and std::numeric_limits correct. */ 104#undef TARGET_96_ROUND_53_LONG_DOUBLE 105#define TARGET_96_ROUND_53_LONG_DOUBLE (!TARGET_64BIT) 106 107/* Tell final.c that we don't need a label passed to mcount. */ 108#define NO_PROFILE_COUNTERS 1 109 110/* Output assembler code to FILE to begin profiling of the current function. 111 LABELNO is an optional label. */ 112 113#undef MCOUNT_NAME 114#define MCOUNT_NAME ".mcount" 115 116/* Output assembler code to FILE to end profiling of the current function. */ 117 118#undef FUNCTION_PROFILER_EPILOGUE /* BDE will need to fix this. */ 119 120 121/************************[ Assembler stuff ]********************************/ 122 123/* Override the default comment-starter of "/" from unix.h. */ 124#undef ASM_COMMENT_START 125#define ASM_COMMENT_START "#" 126 127/* Override the default comment-starter of "/APP" from unix.h. */ 128#undef ASM_APP_ON 129#define ASM_APP_ON "#APP\n" 130#undef ASM_APP_OFF 131#define ASM_APP_OFF "#NO_APP\n" 132 133/* XXX:DEO do we still need this override to defaults.h ?? */ 134/* This is how to output a reference to a user-level label named NAME. */ 135#undef ASM_OUTPUT_LABELREF 136#define ASM_OUTPUT_LABELREF(FILE, NAME) \ 137 do { \ 138 const char *xname = (NAME); \ 139 /* Hack to avoid writing lots of rtl in \ 140 FUNCTION_PROFILER_EPILOGUE (). */ \ 141 if (*xname == '.' && strcmp(xname + 1, "mexitcount") == 0) \ 142 { \ 143 if (flag_pic) \ 144 fprintf ((FILE), "*%s@GOT(%%ebx)", xname); \ 145 else \ 146 fprintf ((FILE), "%s", xname); \ 147 } \ 148 else \ 149 { \ 150 if (xname[0] == '%') \ 151 xname += 2; \ 152 if (xname[0] == '*') \ 153 xname += 1; \ 154 else \ 155 fputs (user_label_prefix, FILE); \ 156 fputs (xname, FILE); \ 157 } \ 158} while (0) 159 160/* This is how to hack on the symbol code of certain relcalcitrant 161 symbols to modify their output in output_pic_addr_const (). */ 162 163#undef ASM_HACK_SYMBOLREF_CODE /* BDE will need to fix this. */ 164 165/* A C statement to output to the stdio stream FILE an assembler 166 command to advance the location counter to a multiple of 1<<LOG 167 bytes if it is within MAX_SKIP bytes. 168 169 This is used to align code labels according to Intel recommendations. */ 170 171/* XXX configuration of this is broken in the same way as HAVE_GAS_SHF_MERGE, 172 but it is easier to fix in an MD way. */ 173 174#ifdef HAVE_GAS_MAX_SKIP_P2ALIGN 175#undef ASM_OUTPUT_MAX_SKIP_ALIGN 176#define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE, LOG, MAX_SKIP) \ 177 do { \ 178 if ((LOG) != 0) { \ 179 if ((MAX_SKIP) == 0) \ 180 fprintf ((FILE), "\t.p2align %d\n", (LOG)); \ 181 else \ 182 fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \ 183 } \ 184 } while (0) 185#endif 186 187/* If defined, a C expression whose value is a string containing the 188 assembler operation to identify the following data as 189 uninitialized global data. If not defined, and neither 190 `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined, 191 uninitialized global data will be output in the data section if 192 `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be 193 used. */ 194#undef BSS_SECTION_ASM_OP 195#define BSS_SECTION_ASM_OP "\t.section\t.bss" 196 197/* Like `ASM_OUTPUT_BSS' except takes the required alignment as a 198 separate, explicit argument. If you define this macro, it is used 199 in place of `ASM_OUTPUT_BSS', and gives you more flexibility in 200 handling the required alignment of the variable. The alignment is 201 specified as the number of bits. 202 203 Try to use function `asm_output_aligned_bss' defined in file 204 `varasm.c' when defining this macro. */ 205#undef ASM_OUTPUT_ALIGNED_BSS 206#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \ 207 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN) 208 209/************************[ Debugger stuff ]*********************************/ 210 211#undef DBX_REGISTER_NUMBER 212#define DBX_REGISTER_NUMBER(n) (TARGET_64BIT ? dbx64_register_map[n] \ 213 : (write_symbols == DWARF2_DEBUG) \ 214 ? svr4_dbx_register_map[(n)] \ 215 : dbx_register_map[(n)]) 216 217/* The same functions are used to creating the DWARF2 debug info and C++ 218 unwind info (except.c). Regardless of the debug format requested, the 219 register numbers used in exception unwinding sections still have to be 220 DWARF compatible. IMO the GCC folks may be abusing the DBX_REGISTER_NUMBER 221 macro to mean too much. */ 222#define DWARF_FRAME_REGNUM(n) (TARGET_64BIT ? dbx64_register_map[n] \ 223 : svr4_dbx_register_map[(n)]) 224 225/* stabs-in-elf has offsets relative to function beginning */ 226#undef DBX_OUTPUT_LBRAC 227#define DBX_OUTPUT_LBRAC(FILE, NAME) \ 228 do { \ 229 fprintf (asm_out_file, "%s %d,0,0,", ASM_STABN_OP, N_LBRAC); \ 230 assemble_name (asm_out_file, NAME); \ 231 fputc ('-', asm_out_file); \ 232 assemble_name (asm_out_file, \ 233 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \ 234 fprintf (asm_out_file, "\n"); \ 235 } while (0) 236 237#undef DBX_OUTPUT_RBRAC 238#define DBX_OUTPUT_RBRAC(FILE, NAME) \ 239 do { \ 240 fprintf (asm_out_file, "%s %d,0,0,", ASM_STABN_OP, N_RBRAC); \ 241 assemble_name (asm_out_file, NAME); \ 242 fputc ('-', asm_out_file); \ 243 assemble_name (asm_out_file, \ 244 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \ 245 fprintf (asm_out_file, "\n"); \ 246 } while (0) 247