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Diffstat (limited to 'gcc/config/i386/linux.h')
| -rw-r--r-- | gcc/config/i386/linux.h | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/gcc/config/i386/linux.h b/gcc/config/i386/linux.h new file mode 100644 index 0000000..7eb2395 --- /dev/null +++ b/gcc/config/i386/linux.h @@ -0,0 +1,194 @@ +/* Definitions for Intel 386 running Linux-based GNU systems with ELF format. + Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2004, 2005, + 2006 Free Software Foundation, Inc. + Contributed by Eric Youngdale. + Modified for stabs-in-ELF by H.J. Lu. + +This file is part of GCC. + +GCC is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GCC is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GCC; see the file COPYING. If not, write to +the Free Software Foundation, 51 Franklin Street, Fifth Floor, +Boston, MA 02110-1301, USA. */ + +/* Output at beginning of assembler file. */ +/* The .file command should always begin the output. */ +#define TARGET_ASM_FILE_START_FILE_DIRECTIVE true + +#define TARGET_VERSION fprintf (stderr, " (i386 Linux/ELF)"); + +/* The svr4 ABI for the i386 says that records and unions are returned + in memory. */ +#undef DEFAULT_PCC_STRUCT_RETURN +#define DEFAULT_PCC_STRUCT_RETURN 1 + +/* We arrange for the whole %gs segment to map the tls area. */ +#undef TARGET_TLS_DIRECT_SEG_REFS_DEFAULT +#define TARGET_TLS_DIRECT_SEG_REFS_DEFAULT MASK_TLS_DIRECT_SEG_REFS + +#undef ASM_COMMENT_START +#define ASM_COMMENT_START "#" + +#undef DBX_REGISTER_NUMBER +#define DBX_REGISTER_NUMBER(n) \ + (TARGET_64BIT ? dbx64_register_map[n] : svr4_dbx_register_map[n]) + +/* Output assembler code to FILE to call the profiler. + To the best of my knowledge, no Linux libc has required the label + argument to mcount. */ + +#define NO_PROFILE_COUNTERS 1 + +#undef MCOUNT_NAME +#define MCOUNT_NAME "mcount" + +/* The GLIBC version of mcount for the x86 assumes that there is a + frame, so we cannot allow profiling without a frame pointer. */ + +#undef SUBTARGET_FRAME_POINTER_REQUIRED +#define SUBTARGET_FRAME_POINTER_REQUIRED current_function_profile + +#undef SIZE_TYPE +#define SIZE_TYPE "unsigned int" + +#undef PTRDIFF_TYPE +#define PTRDIFF_TYPE "int" + +#undef WCHAR_TYPE +#define WCHAR_TYPE "long int" + +#undef WCHAR_TYPE_SIZE +#define WCHAR_TYPE_SIZE BITS_PER_WORD + +#define TARGET_OS_CPP_BUILTINS() \ + do \ + { \ + LINUX_TARGET_OS_CPP_BUILTINS(); \ + } \ + while (0) + +#undef CPP_SPEC +#define CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}" + +#undef CC1_SPEC +#define CC1_SPEC "%(cc1_cpu) %{profile:-p}" + +/* Provide a LINK_SPEC appropriate for Linux. Here we provide support + for the special GCC options -static and -shared, which allow us to + link things in one of these three modes by applying the appropriate + combinations of options at link-time. We like to support here for + as many of the other GNU linker options as possible. But I don't + have the time to search for those flags. I am sure how to add + support for -soname shared_object_name. H.J. + + I took out %{v:%{!V:-V}}. It is too much :-(. They can use + -Wl,-V. + + When the -shared link option is used a final link is not being + done. */ + +/* If ELF is the default format, we should not use /lib/elf. */ + +/* These macros may be overridden in k*bsd-gnu.h and i386/k*bsd-gnu.h. */ +#define LINK_EMULATION "elf_i386" +#define GLIBC_DYNAMIC_LINKER "/lib/ld-linux.so.2" + +#undef SUBTARGET_EXTRA_SPECS +#define SUBTARGET_EXTRA_SPECS \ + { "link_emulation", LINK_EMULATION },\ + { "dynamic_linker", LINUX_DYNAMIC_LINKER } + +#undef LINK_SPEC +#define LINK_SPEC "-m %(link_emulation) %{shared:-shared} \ + %{!shared: \ + %{!ibcs: \ + %{!static: \ + %{rdynamic:-export-dynamic} \ + %{!dynamic-linker:-dynamic-linker %(dynamic_linker)}} \ + %{static:-static}}}" + +/* Similar to standard Linux, but adding -ffast-math support. */ +#undef ENDFILE_SPEC +#define ENDFILE_SPEC \ + "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \ + %{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s" + +/* A C statement (sans semicolon) to output to the stdio stream + FILE the assembler definition of uninitialized global DECL named + NAME whose size is SIZE bytes and alignment is ALIGN bytes. + Try to use asm_output_aligned_bss to implement this macro. */ + +#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \ + asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN) + +/* A C statement to output to the stdio stream FILE an assembler + command to advance the location counter to a multiple of 1<<LOG + bytes if it is within MAX_SKIP bytes. + + This is used to align code labels according to Intel recommendations. */ + +#ifdef HAVE_GAS_MAX_SKIP_P2ALIGN +#define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \ + do { \ + if ((LOG) != 0) { \ + if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG)); \ + else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \ + } \ + } while (0) +#endif + +/* Handle special EH pointer encodings. Absolute, pc-relative, and + indirect are handled automatically. */ +#define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \ + do { \ + if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_datarel) \ + { \ + fputs (ASM_LONG, FILE); \ + assemble_name (FILE, XSTR (ADDR, 0)); \ + fputs (((ENCODING) & DW_EH_PE_indirect ? "@GOT" : "@GOTOFF"), FILE); \ + goto DONE; \ + } \ + } while (0) + +/* Used by crtstuff.c to initialize the base of data-relative relocations. + These are GOT relative on x86, so return the pic register. */ +#ifdef __PIC__ +#define CRT_GET_RFIB_DATA(BASE) \ + { \ + register void *ebx_ __asm__("ebx"); \ + BASE = ebx_; \ + } +#else +#define CRT_GET_RFIB_DATA(BASE) \ + __asm__ ("call\t.LPR%=\n" \ + ".LPR%=:\n\t" \ + "popl\t%0\n\t" \ + /* Due to a GAS bug, this cannot use EAX. That encodes \ + smaller than the traditional EBX, which results in the \ + offset being off by one. */ \ + "addl\t$_GLOBAL_OFFSET_TABLE_+[.-.LPR%=],%0" \ + : "=d"(BASE)) +#endif + +#undef NEED_INDICATE_EXEC_STACK +#define NEED_INDICATE_EXEC_STACK 1 + +#define MD_UNWIND_SUPPORT "config/i386/linux-unwind.h" + +/* This macro may be overridden in i386/k*bsd-gnu.h. */ +#define REG_NAME(reg) reg + +#ifdef TARGET_LIBC_PROVIDES_SSP +/* i386 glibc provides __stack_chk_guard in %gs:0x14. */ +#define TARGET_THREAD_SSP_OFFSET 0x14 +#endif |
