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