-/* Definitions for Intel 386 running Linux
- Copyright (C) 1992, 1994 Free Software Foundation, Inc.
- Contributed by H.J. Lu (hjl@nynexst.com)
+/* 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, 2008, 2009, 2010 Free Software Foundation, Inc.
+ Contributed by Eric Youngdale.
+ Modified for stabs-in-ELF by H.J. Lu.
-This file is part of GNU CC.
+This file is part of GCC.
-GNU CC is free software; you can redistribute it and/or modify
+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)
+the Free Software Foundation; either version 3, or (at your option)
any later version.
-GNU CC is distributed in the hope that it will be useful,
+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 GNU CC; see the file COPYING. If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
-#if 0 /* The FSF has fixed the known bugs. But ....... */
+/* Output at beginning of assembler file. */
+/* The .file command should always begin the output. */
+#define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
-/* Linux has a hacked gas 1.38.1, which can handle repz, repnz
- and fildll. */
+#define TARGET_VERSION fprintf (stderr, " (i386 Linux/ELF)");
-#define GOOD_GAS
-#endif
+/* 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
-/* Don't assume anything about the header files. */
-#define NO_IMPLICIT_EXTERN_C
+/* 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
-/* This is tested by i386/gas.h. */
-#define YES_UNDERSCORES
+#undef ASM_COMMENT_START
+#define ASM_COMMENT_START "#"
-#ifndef LINUX_ELF
-#include "i386/gstabs.h"
-#endif
+#undef DBX_REGISTER_NUMBER
+#define DBX_REGISTER_NUMBER(n) \
+ (TARGET_64BIT ? dbx64_register_map[n] : svr4_dbx_register_map[n])
-/* Specify predefined symbols in preprocessor. */
+/* 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. */
-#undef CPP_PREDEFINES
-#define CPP_PREDEFINES "-Dunix -Di386 -Dlinux -Asystem(unix) -Asystem(posix) -Acpu(i386) -Amachine(i386)"
+#define NO_PROFILE_COUNTERS 1
-#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 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. */
+#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.
+
+ 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} --32 %{!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) \
+ && (MAX_SKIP) >= 7) \
+ fputs ("\t.p2align 3\n", (FILE)); \
+ } \
+ } \
+ } while (0)
+#endif
-#if 0
-#undef MULTIBYTE_CHARS
-#define MULTIBYTE_CHARS 1
+/* 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" \
+ "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
-#undef LIB_SPEC
-#define LIB_SPEC \
-"%{mieee-fp:-lieee} %{p:-lgmon -lc_p} %{pg:-lgmon -lc_p} \
- %{!p:%{!pg:%{!g*:-lc} %{g*:-lg}}}"
+/* 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 STARTFILE_SPEC
-#define STARTFILE_SPEC "%{pg:gcrt0.o%s} %{!pg:%{p:gcrt0.o%s} %{!p:crt0.o%s}}"
+#define TARGET_ASM_FILE_END file_end_indicate_exec_stack
-\f
-/* 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 "#"
+#define MD_UNWIND_SUPPORT "config/i386/linux-unwind.h"
-#undef ASM_APP_ON
-#define ASM_APP_ON "#APP\n"
+/* The stack pointer needs to be moved while checking the stack. */
+#define STACK_CHECK_MOVING_SP 1
-#undef ASM_APP_OFF
-#define ASM_APP_OFF "#NO_APP\n"
-\f
-/* 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
+/* Static stack checking is supported by means of probes. */
+#define STACK_CHECK_STATIC_BUILTIN 1
-/* We need that too. */
-#define HANDLE_SYSV_PRAGMA
+/* This macro may be overridden in i386/k*bsd-gnu.h. */
+#define REG_NAME(reg) reg
-#undef LINK_SPEC
+#ifdef TARGET_LIBC_PROVIDES_SSP
+/* i386 glibc provides __stack_chk_guard in %gs:0x14. */
+#define TARGET_THREAD_SSP_OFFSET 0x14
-/* We want to pass -v to linker */
-#if TARGET_CPU_DEFAULT == 2
-#define LINK_SPEC "%{v:-dll-verbose} %{!m386:-m486}"
-#else
-#define LINK_SPEC "%{v:-dll-verbose} %{m486:-m486}"
+/* We steal the last transactional memory word. */
+#define TARGET_CAN_SPLIT_STACK
+#define TARGET_THREAD_SPLIT_STACK_OFFSET 0x30
#endif
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