gcc/config/i386/linux.h - gcc - Git at Google

 /* Definitions for Intel 386 running Linux-based GNU systems with ELF format.
    Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2001 Free Software Foundation, Inc.
    Contributed by Eric Youngdale.
    Modified for stabs-in-ELF by H.J. Lu.

 This file is part of GNU CC.

 GNU CC 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.

 GNU CC 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, 59 Temple Place - Suite 330,
 Boston, MA 02111-1307, USA.  */

 #define LINUX_DEFAULT_ELF

 /* Output at beginning of assembler file.  */
 /* The .file command should always begin the output.  */
 #undef ASM_FILE_START
 #define ASM_FILE_START(FILE)						\
   do {									\
 	output_file_directive (FILE, main_input_filename);		\
 	if (target_flags & MASK_INTEL_SYNTAX)				\
 	  fputs ("\t.intel_syntax\n", FILE);				\
 	fprintf (FILE, "\t.version\t\"01.01\"\n");			\
   } while (0)

 #undef TARGET_VERSION
 #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

 #undef ASM_COMMENT_START
 #define ASM_COMMENT_START "#"

 /* 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. */
 #undef ASM_OUTPUT_ADDR_DIFF_ELT
 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, 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 (flag_pic)

 #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

 #undef FUNCTION_PROFILER
 #define FUNCTION_PROFILER(FILE, LABELNO)  \
 {									\
   if (flag_pic)								\
     fprintf (FILE, "\tcall\t*mcount@GOT(%%ebx)\n");			\
   else									\
     fprintf (FILE, "\tcall\tmcount\n");					\
 }

 #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

 #undef CPP_PREDEFINES
 #define CPP_PREDEFINES "-D__ELF__ -Dunix -Dlinux -Asystem=posix"

 #undef CPP_SPEC
 #ifdef USE_GNULIBC_1
 #define CPP_SPEC "%(cpp_cpu) %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{posix:-D_POSIX_SOURCE}"
 #else
 #define CPP_SPEC "%(cpp_cpu) %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
 #endif

 #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. */

 #undef	LINK_SPEC
 #ifdef USE_GNULIBC_1
 #ifndef LINUX_DEFAULT_ELF
 #define LINK_SPEC "-m elf_i386 %{shared:-shared} \
   %{!shared: \
     %{!ibcs: \
       %{!static: \
 	%{rdynamic:-export-dynamic} \
 	%{!dynamic-linker:-dynamic-linker /lib/elf/ld-linux.so.1} \
 	%{!rpath:-rpath /lib/elf/}} %{static:-static}}}"
 #else
 #define LINK_SPEC "-m elf_i386 %{shared:-shared} \
   %{!shared: \
     %{!ibcs: \
       %{!static: \
 	%{rdynamic:-export-dynamic} \
 	%{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.1}} \
 	%{static:-static}}}"
 #endif
 #else
 #define LINK_SPEC "-m elf_i386 %{shared:-shared} \
   %{!shared: \
     %{!ibcs: \
       %{!static: \
 	%{rdynamic:-export-dynamic} \
 	%{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2}} \
 	%{static:-static}}}"
 #endif

 /* Get perform_* macros to build libgcc.a.  */
 #include "i386/perform.h"

 /* 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

 #if defined(__PIC__) && defined (USE_GNULIBC_1)
 /* This is a kludge. The i386 GNU/Linux dynamic linker needs ___brk_addr,
    __environ and atexit (). We have to make sure they are in the .dynsym
    section. We accomplish it by making a dummy call here. This
    code is never reached.  */

 #define CRT_END_INIT_DUMMY		\
   do					\
     {					\
       extern void *___brk_addr;		\
       extern char **__environ;		\
 					\
       ___brk_addr = __environ;		\
       atexit (0);			\
     }					\
   while (0)
 #endif

 /* Do code reading to identify a signal frame, and set the frame
    state data appropriately.  See unwind-dw2.c for the structs.  */

 #ifdef IN_LIBGCC2
 #include <signal.h>
 #include <sys/ucontext.h>
 #endif

 #define MD_FALLBACK_FRAME_STATE_FOR(CONTEXT, FS, SUCCESS)		\
   do {									\
     unsigned char *pc_ = (CONTEXT)->ra;					\
     struct sigcontext *sc_;						\
     long new_cfa_;							\
 									\
     /* popl %eax ; movl $__NR_sigreturn,%eax ; int $0x80  */		\
     if (*(unsigned short *)(pc_+0) == 0xb858				\
 	&& *(unsigned int *)(pc_+2) == 119				\
 	&& *(unsigned short *)(pc_+6) == 0x80cd)			\
       sc_ = (CONTEXT)->cfa + 4;						\
     /* movl $__NR_rt_sigreturn,%eax ; int $0x80  */			\
     else if (*(unsigned char *)(pc_+0) == 0xb8				\
 	     && *(unsigned int *)(pc_+1) == 173				\
 	     && *(unsigned short *)(pc_+5) == 0x80cd)			\
       {									\
 	struct rt_sigframe {						\
 	  int sig;							\
 	  struct siginfo *pinfo;					\
 	  void *puc;							\
 	  struct siginfo info;						\
 	  struct ucontext uc;						\
 	} *rt_ = (CONTEXT)->cfa;					\
 	sc_ = (struct sigcontext *) &rt_->uc.uc_mcontext;		\
       }									\
     else								\
       break;								\
 									\
     new_cfa_ = sc_->esp;						\
     (FS)->cfa_how = CFA_REG_OFFSET;					\
     (FS)->cfa_reg = 4;							\
     (FS)->cfa_offset = new_cfa_ - (long) (CONTEXT)->cfa;		\
 									\
     /* The SVR4 register numbering macros aren't usable in libgcc.  */	\
     (FS)->regs.reg[0].how = REG_SAVED_OFFSET;				\
     (FS)->regs.reg[0].loc.offset = (long)&sc_->eax - new_cfa_;		\
     (FS)->regs.reg[3].how = REG_SAVED_OFFSET;				\
     (FS)->regs.reg[3].loc.offset = (long)&sc_->ebx - new_cfa_;		\
     (FS)->regs.reg[1].how = REG_SAVED_OFFSET;				\
     (FS)->regs.reg[1].loc.offset = (long)&sc_->ecx - new_cfa_;		\
     (FS)->regs.reg[2].how = REG_SAVED_OFFSET;				\
     (FS)->regs.reg[2].loc.offset = (long)&sc_->edx - new_cfa_;		\
     (FS)->regs.reg[6].how = REG_SAVED_OFFSET;				\
     (FS)->regs.reg[6].loc.offset = (long)&sc_->esi - new_cfa_;		\
     (FS)->regs.reg[7].how = REG_SAVED_OFFSET;				\
     (FS)->regs.reg[7].loc.offset = (long)&sc_->edi - new_cfa_;		\
     (FS)->regs.reg[5].how = REG_SAVED_OFFSET;				\
     (FS)->regs.reg[5].loc.offset = (long)&sc_->ebp - new_cfa_;		\
     (FS)->regs.reg[8].how = REG_SAVED_OFFSET;				\
     (FS)->regs.reg[8].loc.offset = (long)&sc_->eip - new_cfa_;		\
     (FS)->retaddr_column = 8;						\
     goto SUCCESS;							\
   } while (0)
	/* Definitions for Intel 386 running Linux-based GNU systems with ELF format.
	Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2001 Free Software Foundation, Inc.
	Contributed by Eric Youngdale.
	Modified for stabs-in-ELF by H.J. Lu.

	This file is part of GNU CC.

	GNU CC 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.

	GNU CC 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, 59 Temple Place - Suite 330,
	Boston, MA 02111-1307, USA. */

	#define LINUX_DEFAULT_ELF

	/* Output at beginning of assembler file. */
	/* The .file command should always begin the output. */
	#undef ASM_FILE_START
	#define ASM_FILE_START(FILE) \
	do { \
	output_file_directive (FILE, main_input_filename); \
	if (target_flags & MASK_INTEL_SYNTAX) \
	fputs ("\t.intel_syntax\n", FILE); \
	fprintf (FILE, "\t.version\t\"01.01\"\n"); \
	} while (0)

	#undef TARGET_VERSION
	#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

	#undef ASM_COMMENT_START
	#define ASM_COMMENT_START "#"

	/* 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. */
	#undef ASM_OUTPUT_ADDR_DIFF_ELT
	#define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, 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 (flag_pic)

	#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

	#undef FUNCTION_PROFILER
	#define FUNCTION_PROFILER(FILE, LABELNO) \
	{ \
	if (flag_pic) \
	fprintf (FILE, "\tcall\t*mcount@GOT(%%ebx)\n"); \
	else \
	fprintf (FILE, "\tcall\tmcount\n"); \
	}

	#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

	#undef CPP_PREDEFINES
	#define CPP_PREDEFINES "-D__ELF__ -Dunix -Dlinux -Asystem=posix"

	#undef CPP_SPEC
	#ifdef USE_GNULIBC_1
	#define CPP_SPEC "%(cpp_cpu) %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{posix:-D_POSIX_SOURCE}"
	#else
	#define CPP_SPEC "%(cpp_cpu) %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
	#endif

	#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. */

	#undef LINK_SPEC
	#ifdef USE_GNULIBC_1
	#ifndef LINUX_DEFAULT_ELF
	#define LINK_SPEC "-m elf_i386 %{shared:-shared} \
	%{!shared: \
	%{!ibcs: \
	%{!static: \
	%{rdynamic:-export-dynamic} \
	%{!dynamic-linker:-dynamic-linker /lib/elf/ld-linux.so.1} \
	%{!rpath:-rpath /lib/elf/}} %{static:-static}}}"
	#else
	#define LINK_SPEC "-m elf_i386 %{shared:-shared} \
	%{!shared: \
	%{!ibcs: \
	%{!static: \
	%{rdynamic:-export-dynamic} \
	%{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.1}} \
	%{static:-static}}}"
	#endif
	#else
	#define LINK_SPEC "-m elf_i386 %{shared:-shared} \
	%{!shared: \
	%{!ibcs: \
	%{!static: \
	%{rdynamic:-export-dynamic} \
	%{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2}} \
	%{static:-static}}}"
	#endif

	/* Get perform_* macros to build libgcc.a. */
	#include "i386/perform.h"

	/* 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

	#if defined(__PIC__) && defined (USE_GNULIBC_1)
	/* This is a kludge. The i386 GNU/Linux dynamic linker needs ___brk_addr,
	__environ and atexit (). We have to make sure they are in the .dynsym
	section. We accomplish it by making a dummy call here. This
	code is never reached. */

	#define CRT_END_INIT_DUMMY \
	do \
	{ \
	extern void *___brk_addr; \
	extern char **__environ; \
	\
	___brk_addr = __environ; \
	atexit (0); \
	} \
	while (0)
	#endif

	/* Do code reading to identify a signal frame, and set the frame
	state data appropriately. See unwind-dw2.c for the structs. */

	#ifdef IN_LIBGCC2
	#include <signal.h>
	#include <sys/ucontext.h>
	#endif

	#define MD_FALLBACK_FRAME_STATE_FOR(CONTEXT, FS, SUCCESS) \
	do { \
	unsigned char *pc_ = (CONTEXT)->ra; \
	struct sigcontext *sc_; \
	long new_cfa_; \
	\
	/* popl %eax ; movl $__NR_sigreturn,%eax ; int $0x80 */ \
	if ((unsigned short )(pc_+0) == 0xb858 \
	&& (unsigned int )(pc_+2) == 119 \
	&& (unsigned short )(pc_+6) == 0x80cd) \
	sc_ = (CONTEXT)->cfa + 4; \
	/* movl $__NR_rt_sigreturn,%eax ; int $0x80 */ \
	else if ((unsigned char )(pc_+0) == 0xb8 \
	&& (unsigned int )(pc_+1) == 173 \
	&& (unsigned short )(pc_+5) == 0x80cd) \
	{ \
	struct rt_sigframe { \
	int sig; \
	struct siginfo *pinfo; \
	void *puc; \
	struct siginfo info; \
	struct ucontext uc; \
	} *rt_ = (CONTEXT)->cfa; \
	sc_ = (struct sigcontext *) &rt_->uc.uc_mcontext; \
	} \
	else \
	break; \
	\
	new_cfa_ = sc_->esp; \
	(FS)->cfa_how = CFA_REG_OFFSET; \
	(FS)->cfa_reg = 4; \
	(FS)->cfa_offset = new_cfa_ - (long) (CONTEXT)->cfa; \
	\
	/* The SVR4 register numbering macros aren't usable in libgcc. */ \
	(FS)->regs.reg[0].how = REG_SAVED_OFFSET; \
	(FS)->regs.reg[0].loc.offset = (long)&sc_->eax - new_cfa_; \
	(FS)->regs.reg[3].how = REG_SAVED_OFFSET; \
	(FS)->regs.reg[3].loc.offset = (long)&sc_->ebx - new_cfa_; \
	(FS)->regs.reg[1].how = REG_SAVED_OFFSET; \
	(FS)->regs.reg[1].loc.offset = (long)&sc_->ecx - new_cfa_; \
	(FS)->regs.reg[2].how = REG_SAVED_OFFSET; \
	(FS)->regs.reg[2].loc.offset = (long)&sc_->edx - new_cfa_; \
	(FS)->regs.reg[6].how = REG_SAVED_OFFSET; \
	(FS)->regs.reg[6].loc.offset = (long)&sc_->esi - new_cfa_; \
	(FS)->regs.reg[7].how = REG_SAVED_OFFSET; \
	(FS)->regs.reg[7].loc.offset = (long)&sc_->edi - new_cfa_; \
	(FS)->regs.reg[5].how = REG_SAVED_OFFSET; \
	(FS)->regs.reg[5].loc.offset = (long)&sc_->ebp - new_cfa_; \
	(FS)->regs.reg[8].how = REG_SAVED_OFFSET; \
	(FS)->regs.reg[8].loc.offset = (long)&sc_->eip - new_cfa_; \
	(FS)->retaddr_column = 8; \
	goto SUCCESS; \
	} while (0)