-/* Definitions for Intel 386 running Linux
- * Copyright (C) 1992 Free Software Foundation, Inc.
- *
- * Written by H.J. Lu (hlu@eecs.wsu.edu)
- *
- * Linux is a POSIX.1 compatible UNIX clone for i386, which uses GNU
- * stuffs as the native stuffs.
- */
+/* 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, 2007 Free Software Foundation, Inc.
+ Contributed by Eric Youngdale.
+ Modified for stabs-in-ELF by H.J. Lu.
-#if 0 /* The FSF has fixed the known bugs. But ....... */
+This file is part of GCC.
-/* Linux has a hacked gas 1.38.1, which can handle repz, repnz
- * and fildll.
- */
+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 3, or (at your option)
+any later version.
-#define GOOD_GAS
+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.
-#endif
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
-/* This is tested by i386/gas.h. */
-#define YES_UNDERSCORES
+/* Output at beginning of assembler file. */
+/* The .file command should always begin the output. */
+#define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
-#include "i386/gstabs.h"
+#define TARGET_VERSION fprintf (stderr, " (i386 Linux/ELF)");
-/* Specify predefined symbols in preprocessor. */
+/* 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
-#undef CPP_PREDEFINES
-#define CPP_PREDEFINES "-Dunix -Di386 -Dlinux"
+/* 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 CPP_SPEC
-#if TARGET_CPU_DEFAULT == 2
-#define CPP_SPEC "%{!m386:-D__i486__} %{posix:-D_POSIX_SOURCE}"
-#else
-#define CPP_SPEC "%{m486:-D__i486__} %{posix:-D_POSIX_SOURCE}"
-#endif
+#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 crtl->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 HAVE_ATEXIT
-#define HAVE_ATEXIT
-
-/* Linux uses ctype from glibc.a. I am not sure how complete it is.
- * For now, we play safe. It may change later.
- */
-#if 0
-#undef MULTIBYTE_CHARS
-#define MULTIBYTE_CHARS 1
+#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 ASM_SPEC
+#define ASM_SPEC \
+ "%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*} \
+ %{!mno-sse2avx:%{mavx:-msse2avx}} %{msse2avx:%{!mavx:-msse2avx}}"
+
+#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} \
+ %{mpc32:crtprec32.o%s} \
+ %{mpc64:crtprec64.o%s} \
+ %{mpc80:crtprec80.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)); \
+ /* Make sure that we have at least 8 byte alignment if > 8 byte \
+ alignment is preferred. */ \
+ if ((LOG) > 3 && (1 << (LOG)) > ((MAX_SKIP) + 1)) \
+ fprintf ((FILE), "\t.p2align 3\n"); \
+ } \
+ } \
+ } while (0)
#endif
-#undef LIB_SPEC
-#define LIB_SPEC "%{g*:-lg} %{!g*:%{!p:%{!pg:-lc}}%{p:-lgmon -lc_p}%{pg:-lgmon -lc_p}}"
-
-
-#undef STARTFILE_SPEC
-#undef GPLUSPLUS_INCLUDE_DIR
-
-#ifdef CROSS_COMPILE
-
-/*
- * For cross-compile, we just need to search `$(tooldir)/lib'
- */
-
-#define STARTFILE_SPEC \
- "%{g*:crt0.o%s -static} %{!g*:%{pg:gcrt0.o%s -static} %{!pg:%{p:gcrt0.o%s -static} %{!p:crt0.o%s %{!static:%{nojump:-nojump}} %{static:-static}}}}"
-
-/*
- *The cross-compile uses this.
- */
-#define GPLUSPLUS_INCLUDE_DIR TOOLDIR"/g++-include"
-
+/* Handle special EH pointer encodings. Absolute, pc-relative, and
+ indirect are handled automatically. */
+#define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
+ do { \
+ if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_datarel) \
+ { \
+ fputs (ASM_LONG, FILE); \
+ assemble_name (FILE, XSTR (ADDR, 0)); \
+ fputs (((ENCODING) & DW_EH_PE_indirect ? "@GOT" : "@GOTOFF"), FILE); \
+ goto DONE; \
+ } \
+ } while (0)
+
+/* Used by crtstuff.c to initialize the base of data-relative relocations.
+ These are GOT relative on x86, so return the pic register. */
+#ifdef __PIC__
+#define CRT_GET_RFIB_DATA(BASE) \
+ { \
+ register void *ebx_ __asm__("ebx"); \
+ BASE = ebx_; \
+ }
#else
-
-#define STARTFILE_SPEC \
- "%{g*:crt0.o%s -static} %{!g*:%{pg:gcrt0.o%s -static} %{!pg:%{p:gcrt0.o%s -static} %{!p:crt0.o%s %{!static:%{nojump:-nojump}} %{static:-static}}}}"
-
-/*
- *The native Linux system uses this.
- */
-#define GPLUSPLUS_INCLUDE_DIR "/usr/g++-include"
-
+#define CRT_GET_RFIB_DATA(BASE) \
+ __asm__ ("call\t.LPR%=\n" \
+ ".LPR%=:\n\t" \
+ "pop{l}\t%0\n\t" \
+ /* Due to a GAS bug, this cannot use EAX. That encodes \
+ smaller than the traditional EBX, which results in the \
+ offset being off by one. */ \
+ "add{l}\t{$_GLOBAL_OFFSET_TABLE_+[.-.LPR%=],%0" \
+ "|%0,_GLOBAL_OFFSET_TABLE_+(.-.LPR%=)}" \
+ : "=d"(BASE))
#endif
-\f
-/* The following macros are copied from i386bsd.h. */
-
-/* Redefine this to use %eax instead of %edx. */
-#undef FUNCTION_PROFILER
-#define FUNCTION_PROFILER(FILE, LABELNO) \
-{ \
- if (flag_pic) \
- { \
- fprintf (FILE, "\tleal %sP%d@GOTOFF(%%ebx),%%eax\n", \
- LPREFIX, (LABELNO)); \
- fprintf (FILE, "\tcall *_mcount@GOT(%%ebx)\n"); \
- } \
- else \
- { \
- fprintf (FILE, "\tmovl $%sP%d,%%eax\n", LPREFIX, (LABELNO)); \
- fprintf (FILE, "\tcall _mcount\n"); \
- } \
-}
-
-/* There are conflicting reports about whether this system uses
- a different assembler syntax. wilson@cygnus.com says # is right. */
-#undef COMMENT_BEGIN
-#define COMMENT_BEGIN "#"
-#undef ASM_APP_ON
-#define ASM_APP_ON "#APP\n"
+/* Put all *tf routines in libgcc. */
+#undef LIBGCC2_HAS_TF_MODE
+#define LIBGCC2_HAS_TF_MODE 1
+#define LIBGCC2_TF_CEXT q
+#define TF_SIZE 113
-#undef ASM_APP_OFF
-#define ASM_APP_OFF "#NO_APP\n"
-\f
-/* The following macros are copied from i386v4.h. */
+#undef NEED_INDICATE_EXEC_STACK
+#define NEED_INDICATE_EXEC_STACK 1
-/* These have to be defined to get PIC code correct */
+#define MD_UNWIND_SUPPORT "config/i386/linux-unwind.h"
-/* This is how to output an element of a case-vector that is relative.
- This is only used for PIC code. See comments by the `casesi' insn in
- i386.md for an explanation of the expression this outputs. */
+/* This macro may be overridden in i386/k*bsd-gnu.h. */
+#define REG_NAME(reg) reg
-#undef ASM_OUTPUT_ADDR_DIFF_ELT
-#define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, VALUE, REL) \
- fprintf (FILE, "\t.long _GLOBAL_OFFSET_TABLE_+[.-%s%d]\n", LPREFIX, VALUE)
-
-/* Indicate that jump tables go in the text section. This is
- necessary when compiling PIC code. */
-
-#define JUMP_TABLES_IN_TEXT_SECTION
-
-/* Don't default to pcc-struct-return, because gcc is the only compiler, and
- we want to retain compatibility with older gcc versions. */
-#define DEFAULT_PCC_STRUCT_RETURN 0
+#ifdef TARGET_LIBC_PROVIDES_SSP
+/* i386 glibc provides __stack_chk_guard in %gs:0x14. */
+#define TARGET_THREAD_SSP_OFFSET 0x14
+#endif