-/* Definitions for Intel 386 running Linux-based GNU systems with ELF format.
- Copyright (C) 1994, 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
- Contributed by Eric Youngdale.
- Modified for stabs-in-ELF by H.J. Lu.
+/* Definitions for rtems targeting an ix86 using ELF.
+ Copyright (C) 1996, 1997, 2000, 2001, 2002 Free Software Foundation, Inc.
+ Contributed by Joel Sherrill (joel@OARcorp.com).
This file is part of GNU CC.
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
-#define LINUX_DEFAULT_ELF
-
-/* A lie, I guess, but the general idea behind linux/ELF is that we are
- supposed to be outputting something that will assemble under SVr4.
- This gets us pretty close. */
-#include <i386/i386.h> /* Base i386 target machine definitions */
-#include <i386/att.h> /* Use the i386 AT&T assembler syntax */
-#include <linux.h> /* some common stuff */
-
-#undef TARGET_VERSION
-#define TARGET_VERSION fprintf (stderr, " (i386 RTEMS with 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, 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)
-
-/* 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 "long int"
-
-#undef WCHAR_TYPE_SIZE
-#define WCHAR_TYPE_SIZE BITS_PER_WORD
-
-#undef CPP_PREDEFINES
-#define CPP_PREDEFINES "-Di386 -Drtems -D__rtems__ \
- -Asystem(rtems) -Acpu(i386) -Amachine(i386)"
-
-/* 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)
-
-#undef STARTFILE_SPEC
-#define STARTFILE_SPEC "crt0.o%s"
-
-#undef ENDFILE_SPEC
-
+/* Specify predefined symbols in preprocessor. */
+
+#define TARGET_OS_CPP_BUILTINS() \
+ do \
+ { \
+ builtin_define ("__rtems__"); \
+ builtin_define ("__USE_INIT_FINI__"); \
+ builtin_assert ("system=rtems"); \
+ if (!TARGET_80387) \
+ builtin_define ("_SOFT_FLOAT"); \
+ } \
+ while (0)
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