281 lines
9.6 KiB
C
281 lines
9.6 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
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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 GNU CC.
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GNU CC 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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GNU CC 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 GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#define LINUX_DEFAULT_ELF
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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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#undef ASM_FILE_START
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#define ASM_FILE_START(FILE) \
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do { \
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output_file_directive (FILE, main_input_filename); \
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if (ix86_asm_dialect == ASM_INTEL) \
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fputs ("\t.intel_syntax\n", FILE); \
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} while (0)
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#undef TARGET_VERSION
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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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#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
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#undef FUNCTION_PROFILER
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#define FUNCTION_PROFILER(FILE, LABELNO) \
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{ \
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if (flag_pic) \
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fprintf (FILE, "\tcall\t*mcount@GOT(%%ebx)\n"); \
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else \
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fprintf (FILE, "\tcall\tmcount\n"); \
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}
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/* True if it is possible to profile code that does not have a frame
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pointer.
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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 TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
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#define TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER false
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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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#undef CPP_PREDEFINES
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#define CPP_PREDEFINES "-D__ELF__ -Dunix -D__gnu_linux__ -Dlinux -Asystem=posix"
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#undef CPP_SPEC
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#ifdef USE_GNULIBC_1
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#define CPP_SPEC "%(cpp_cpu) %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{posix:-D_POSIX_SOURCE}"
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#else
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#define CPP_SPEC "%(cpp_cpu) %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
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#endif
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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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#undef LINK_SPEC
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#ifdef USE_GNULIBC_1
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#ifndef LINUX_DEFAULT_ELF
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#define LINK_SPEC "-m elf_i386 %{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 /lib/elf/ld-linux.so.1} \
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%{!rpath:-rpath /lib/elf/}} %{static:-static}}}"
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#else
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#define LINK_SPEC "-m elf_i386 %{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 /lib/ld-linux.so.1}} \
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%{static:-static}}}"
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#endif
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#else
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#define LINK_SPEC "-m elf_i386 %{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 /lib/ld-linux.so.2}} \
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%{static:-static}}}"
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#endif
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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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#if defined(__PIC__) && defined (USE_GNULIBC_1)
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/* This is a kludge. The i386 GNU/Linux dynamic linker needs ___brk_addr,
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__environ and atexit. We have to make sure they are in the .dynsym
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section. We do this by forcing the assembler to create undefined
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references to these symbols in the object file. */
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#undef CRT_CALL_STATIC_FUNCTION
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#define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \
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asm (SECTION_OP "\n\t" \
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"call " USER_LABEL_PREFIX #FUNC "\n" \
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TEXT_SECTION_ASM_OP "\n\t" \
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".extern ___brk_addr\n\t" \
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".type ___brk_addr,@object\n\t" \
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".extern __environ\n\t" \
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".type __environ,@object\n\t" \
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".extern atexit\n\t" \
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".type atexit,@function");
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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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/* Do code reading to identify a signal frame, and set the frame
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state data appropriately. See unwind-dw2.c for the structs. */
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#ifdef IN_LIBGCC2
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#include <signal.h>
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#include <sys/ucontext.h>
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#endif
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#define MD_FALLBACK_FRAME_STATE_FOR(CONTEXT, FS, SUCCESS) \
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do { \
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unsigned char *pc_ = (CONTEXT)->ra; \
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struct sigcontext *sc_; \
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long new_cfa_; \
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\
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/* popl %eax ; movl $__NR_sigreturn,%eax ; int $0x80 */ \
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if (*(unsigned short *)(pc_+0) == 0xb858 \
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&& *(unsigned int *)(pc_+2) == 119 \
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&& *(unsigned short *)(pc_+6) == 0x80cd) \
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sc_ = (CONTEXT)->cfa + 4; \
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/* movl $__NR_rt_sigreturn,%eax ; int $0x80 */ \
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else if (*(unsigned char *)(pc_+0) == 0xb8 \
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&& *(unsigned int *)(pc_+1) == 173 \
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&& *(unsigned short *)(pc_+5) == 0x80cd) \
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{ \
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struct rt_sigframe { \
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int sig; \
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struct siginfo *pinfo; \
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void *puc; \
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struct siginfo info; \
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struct ucontext uc; \
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} *rt_ = (CONTEXT)->cfa; \
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sc_ = (struct sigcontext *) &rt_->uc.uc_mcontext; \
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} \
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else \
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break; \
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\
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new_cfa_ = sc_->esp; \
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(FS)->cfa_how = CFA_REG_OFFSET; \
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(FS)->cfa_reg = 4; \
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(FS)->cfa_offset = new_cfa_ - (long) (CONTEXT)->cfa; \
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\
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/* The SVR4 register numbering macros aren't usable in libgcc. */ \
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(FS)->regs.reg[0].how = REG_SAVED_OFFSET; \
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(FS)->regs.reg[0].loc.offset = (long)&sc_->eax - new_cfa_; \
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(FS)->regs.reg[3].how = REG_SAVED_OFFSET; \
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(FS)->regs.reg[3].loc.offset = (long)&sc_->ebx - new_cfa_; \
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(FS)->regs.reg[1].how = REG_SAVED_OFFSET; \
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(FS)->regs.reg[1].loc.offset = (long)&sc_->ecx - new_cfa_; \
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(FS)->regs.reg[2].how = REG_SAVED_OFFSET; \
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(FS)->regs.reg[2].loc.offset = (long)&sc_->edx - new_cfa_; \
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(FS)->regs.reg[6].how = REG_SAVED_OFFSET; \
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(FS)->regs.reg[6].loc.offset = (long)&sc_->esi - new_cfa_; \
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(FS)->regs.reg[7].how = REG_SAVED_OFFSET; \
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(FS)->regs.reg[7].loc.offset = (long)&sc_->edi - new_cfa_; \
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(FS)->regs.reg[5].how = REG_SAVED_OFFSET; \
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(FS)->regs.reg[5].loc.offset = (long)&sc_->ebp - new_cfa_; \
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(FS)->regs.reg[8].how = REG_SAVED_OFFSET; \
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(FS)->regs.reg[8].loc.offset = (long)&sc_->eip - new_cfa_; \
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(FS)->retaddr_column = 8; \
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goto SUCCESS; \
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} while (0)
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