gcc/config/i386/freebsd-elf.h - gcc - Git at Google

 /* Definitions for Intel 386 running FreeBSD with ELF format
    Copyright (C) 1996 Free Software Foundation, Inc.
    Contributed by Eric Youngdale.
    Modified for stabs-in-ELF by H.J. Lu.
    Adapted from Linux version by John Polstra.

 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.  */

 #undef TARGET_VERSION
 #define TARGET_VERSION fprintf (stderr, " (i386 FreeBSD/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

 /* 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, 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

 /* Copy this from the svr4 specifications... */
 /* Define the register numbers to be used in Dwarf debugging information.
    The SVR4 reference port C compiler uses the following register numbers
    in its Dwarf output code:
 	0 for %eax (gnu regno = 0)
 	1 for %ecx (gnu regno = 2)
 	2 for %edx (gnu regno = 1)
 	3 for %ebx (gnu regno = 3)
 	4 for %esp (gnu regno = 7)
 	5 for %ebp (gnu regno = 6)
 	6 for %esi (gnu regno = 4)
 	7 for %edi (gnu regno = 5)
    The following three DWARF register numbers are never generated by
    the SVR4 C compiler or by the GNU compilers, but SDB on x86/svr4
    believes these numbers have these meanings.
 	8  for %eip    (no gnu equivalent)
 	9  for %eflags (no gnu equivalent)
 	10 for %trapno (no gnu equivalent)
    It is not at all clear how we should number the FP stack registers
    for the x86 architecture.  If the version of SDB on x86/svr4 were
    a bit less brain dead with respect to floating-point then we would
    have a precedent to follow with respect to DWARF register numbers
    for x86 FP registers, but the SDB on x86/svr4 is so completely
    broken with respect to FP registers that it is hardly worth thinking
    of it as something to strive for compatibility with.
    The version of x86/svr4 SDB I have at the moment does (partially)
    seem to believe that DWARF register number 11 is associated with
    the x86 register %st(0), but that's about all.  Higher DWARF
    register numbers don't seem to be associated with anything in
    particular, and even for DWARF regno 11, SDB only seems to under-
    stand that it should say that a variable lives in %st(0) (when
    asked via an `=' command) if we said it was in DWARF regno 11,
    but SDB still prints garbage when asked for the value of the
    variable in question (via a `/' command).
    (Also note that the labels SDB prints for various FP stack regs
    when doing an `x' command are all wrong.)
    Note that these problems generally don't affect the native SVR4
    C compiler because it doesn't allow the use of -O with -g and
    because when it is *not* optimizing, it allocates a memory
    location for each floating-point variable, and the memory
    location is what gets described in the DWARF AT_location
    attribute for the variable in question.
    Regardless of the severe mental illness of the x86/svr4 SDB, we
    do something sensible here and we use the following DWARF
    register numbers.  Note that these are all stack-top-relative
    numbers.
 	11 for %st(0) (gnu regno = 8)
 	12 for %st(1) (gnu regno = 9)
 	13 for %st(2) (gnu regno = 10)
 	14 for %st(3) (gnu regno = 11)
 	15 for %st(4) (gnu regno = 12)
 	16 for %st(5) (gnu regno = 13)
 	17 for %st(6) (gnu regno = 14)
 	18 for %st(7) (gnu regno = 15)
 */
 #undef DBX_REGISTER_NUMBER
 #define DBX_REGISTER_NUMBER(n) \
 ((n) == 0 ? 0 \
  : (n) == 1 ? 2 \
  : (n) == 2 ? 1 \
  : (n) == 3 ? 3 \
  : (n) == 4 ? 6 \
  : (n) == 5 ? 7 \
  : (n) == 6 ? 5 \
  : (n) == 7 ? 4 \
  : ((n) >= FIRST_STACK_REG && (n) <= LAST_STACK_REG) ? (n)+3 \
  : (-1))

 /* Output assembler code to FILE to increment profiler label # LABELNO
    for profiling a function entry.  */

 #undef FUNCTION_PROFILER
 #define FUNCTION_PROFILER(FILE, LABELNO)  \
 {									\
   if (flag_pic)								\
     {									\
       fprintf (FILE, "\tleal %sP%d@GOTOFF(%%ebx),%%edx\n",		\
 	       LPREFIX, (LABELNO));					\
       fprintf (FILE, "\tcall *mcount@GOT(%%ebx)\n");			\
     }									\
   else									\
     {									\
       fprintf (FILE, "\tmovl $%sP%d,%%edx\n", LPREFIX, (LABELNO));	\
       fprintf (FILE, "\tcall mcount\n");				\
     }									\
 }

 #undef SIZE_TYPE
 #define SIZE_TYPE "unsigned int"

 #undef PTRDIFF_TYPE
 #define PTRDIFF_TYPE "int"

 #undef WCHAR_TYPE
 #define WCHAR_TYPE "int"

 #undef WCHAR_TYPE_SIZE
 #define WCHAR_TYPE_SIZE BITS_PER_WORD

 #undef CPP_PREDEFINES
 #define CPP_PREDEFINES "-Dunix -D__ELF__ -D__FreeBSD__=2 -Asystem(FreeBSD)"

 #undef CPP_SPEC
 #define CPP_SPEC "%(cpp_cpu) %[cpp_cpu] %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{posix:-D_POSIX_SOURCE}"

 #undef	LIB_SPEC
 #if 1
 /* We no longer link with libc_p.a or libg.a by default. If you
  * want to profile or debug the C library, please add
  * -lc_p or -ggdb to LDFLAGS at the link time, respectively.
  */
 #define LIB_SPEC \
   "%{!shared: %{mieee-fp:-lieee} %{p:-lgmon} %{pg:-lgmon} \
      %{!ggdb:-lc} %{ggdb:-lg}}"
 #else
 #define LIB_SPEC \
   "%{!shared: \
      %{mieee-fp:-lieee} %{p:-lgmon -lc_p} %{pg:-lgmon -lc_p} \
        %{!p:%{!pg:%{!g*:-lc} %{g*:-lg}}}}"
 #endif

 /* Provide a LINK_SPEC appropriate for FreeBSD.  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.  */

 #undef	LINK_SPEC
 #define LINK_SPEC "-m elf_i386 %{shared:-shared} \
   %{!shared: \
     %{!ibcs: \
       %{!static: \
 	%{rdynamic:-export-dynamic} \
 	%{!dynamic-linker:-dynamic-linker /usr/libexec/ld-elf.so.1}} \
 	%{static:-static}}}"

 /* Get perform_* macros to build libgcc.a.  */
	/* Definitions for Intel 386 running FreeBSD with ELF format
	Copyright (C) 1996 Free Software Foundation, Inc.
	Contributed by Eric Youngdale.
	Modified for stabs-in-ELF by H.J. Lu.
	Adapted from Linux version by John Polstra.

	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. */

	#undef TARGET_VERSION
	#define TARGET_VERSION fprintf (stderr, " (i386 FreeBSD/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

	/* 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, 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

	/* Copy this from the svr4 specifications... */
	/* Define the register numbers to be used in Dwarf debugging information.
	The SVR4 reference port C compiler uses the following register numbers
	in its Dwarf output code:
	0 for %eax (gnu regno = 0)
	1 for %ecx (gnu regno = 2)
	2 for %edx (gnu regno = 1)
	3 for %ebx (gnu regno = 3)
	4 for %esp (gnu regno = 7)
	5 for %ebp (gnu regno = 6)
	6 for %esi (gnu regno = 4)
	7 for %edi (gnu regno = 5)
	The following three DWARF register numbers are never generated by
	the SVR4 C compiler or by the GNU compilers, but SDB on x86/svr4
	believes these numbers have these meanings.
	8 for %eip (no gnu equivalent)
	9 for %eflags (no gnu equivalent)
	10 for %trapno (no gnu equivalent)
	It is not at all clear how we should number the FP stack registers
	for the x86 architecture. If the version of SDB on x86/svr4 were
	a bit less brain dead with respect to floating-point then we would
	have a precedent to follow with respect to DWARF register numbers
	for x86 FP registers, but the SDB on x86/svr4 is so completely
	broken with respect to FP registers that it is hardly worth thinking
	of it as something to strive for compatibility with.
	The version of x86/svr4 SDB I have at the moment does (partially)
	seem to believe that DWARF register number 11 is associated with
	the x86 register %st(0), but that's about all. Higher DWARF
	register numbers don't seem to be associated with anything in
	particular, and even for DWARF regno 11, SDB only seems to under-
	stand that it should say that a variable lives in %st(0) (when
	asked via an `=' command) if we said it was in DWARF regno 11,
	but SDB still prints garbage when asked for the value of the
	variable in question (via a `/' command).
	(Also note that the labels SDB prints for various FP stack regs
	when doing an `x' command are all wrong.)
	Note that these problems generally don't affect the native SVR4
	C compiler because it doesn't allow the use of -O with -g and
	because when it is not optimizing, it allocates a memory
	location for each floating-point variable, and the memory
	location is what gets described in the DWARF AT_location
	attribute for the variable in question.
	Regardless of the severe mental illness of the x86/svr4 SDB, we
	do something sensible here and we use the following DWARF
	register numbers. Note that these are all stack-top-relative
	numbers.
	11 for %st(0) (gnu regno = 8)
	12 for %st(1) (gnu regno = 9)
	13 for %st(2) (gnu regno = 10)
	14 for %st(3) (gnu regno = 11)
	15 for %st(4) (gnu regno = 12)
	16 for %st(5) (gnu regno = 13)
	17 for %st(6) (gnu regno = 14)
	18 for %st(7) (gnu regno = 15)
	*/
	#undef DBX_REGISTER_NUMBER
	#define DBX_REGISTER_NUMBER(n) \
	((n) == 0 ? 0 \
	: (n) == 1 ? 2 \
	: (n) == 2 ? 1 \
	: (n) == 3 ? 3 \
	: (n) == 4 ? 6 \
	: (n) == 5 ? 7 \
	: (n) == 6 ? 5 \
	: (n) == 7 ? 4 \
	: ((n) >= FIRST_STACK_REG && (n) <= LAST_STACK_REG) ? (n)+3 \
	: (-1))

	/* Output assembler code to FILE to increment profiler label # LABELNO
	for profiling a function entry. */

	#undef FUNCTION_PROFILER
	#define FUNCTION_PROFILER(FILE, LABELNO) \
	{ \
	if (flag_pic) \
	{ \
	fprintf (FILE, "\tleal %sP%d@GOTOFF(%%ebx),%%edx\n", \
	LPREFIX, (LABELNO)); \
	fprintf (FILE, "\tcall *mcount@GOT(%%ebx)\n"); \
	} \
	else \
	{ \
	fprintf (FILE, "\tmovl $%sP%d,%%edx\n", LPREFIX, (LABELNO)); \
	fprintf (FILE, "\tcall mcount\n"); \
	} \
	}

	#undef SIZE_TYPE
	#define SIZE_TYPE "unsigned int"

	#undef PTRDIFF_TYPE
	#define PTRDIFF_TYPE "int"

	#undef WCHAR_TYPE
	#define WCHAR_TYPE "int"

	#undef WCHAR_TYPE_SIZE
	#define WCHAR_TYPE_SIZE BITS_PER_WORD

	#undef CPP_PREDEFINES
	#define CPP_PREDEFINES "-Dunix -D__ELF__ -D__FreeBSD__=2 -Asystem(FreeBSD)"

	#undef CPP_SPEC
	#define CPP_SPEC "%(cpp_cpu) %[cpp_cpu] %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{posix:-D_POSIX_SOURCE}"

	#undef LIB_SPEC
	#if 1
	/* We no longer link with libc_p.a or libg.a by default. If you
	* want to profile or debug the C library, please add
	* -lc_p or -ggdb to LDFLAGS at the link time, respectively.
	*/
	#define LIB_SPEC \
	"%{!shared: %{mieee-fp:-lieee} %{p:-lgmon} %{pg:-lgmon} \
	%{!ggdb:-lc} %{ggdb:-lg}}"
	#else
	#define LIB_SPEC \
	"%{!shared: \
	%{mieee-fp:-lieee} %{p:-lgmon -lc_p} %{pg:-lgmon -lc_p} \
	%{!p:%{!pg:%{!g:-lc} %{g:-lg}}}}"
	#endif

	/* Provide a LINK_SPEC appropriate for FreeBSD. 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. */

	#undef LINK_SPEC
	#define LINK_SPEC "-m elf_i386 %{shared:-shared} \
	%{!shared: \
	%{!ibcs: \
	%{!static: \
	%{rdynamic:-export-dynamic} \
	%{!dynamic-linker:-dynamic-linker /usr/libexec/ld-elf.so.1}} \
	%{static:-static}}}"

	/* Get perform_* macros to build libgcc.a. */