Initial revision

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@10199 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 285 insertions, 0 deletions

diff --git a/gcc/config/m68k/linux.h b/gcc/config/m68k/linux.h
new file mode 100644
index 00000000000..589b361932e
--- /dev/null
+++ b/gcc/config/m68k/linux.h
@@ -0,0 +1,285 @@
+/* Definitions for Motorola 68k running Linux with ELF format.
+   Copyright (C) 1995 Free Software Foundation, Inc.
+
+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 1, 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
+#define MOTOROLA		/* Use Motorola syntax */
+#define USE_GAS			/* But GAS wants jbsr instead of jsr */
+
+#include <m68k/m68k.h>
+#include <linux.h>		/* some common stuff */
+
+#undef TARGET_VERSION
+#define TARGET_VERSION fprintf (stderr, " (68k Linux/ELF)");
+
+/* 68020 with 68881 */
+#define TARGET_DEFAULT 7
+
+#undef SUBTARGET_SWITCHES
+#define SUBTARGET_SWITCHES	{"ieee-fp", 0},
+
+/* Here are four prefixes that are used by asm_fprintf to
+   facilitate customization for alternate assembler syntaxes.
+   Machines with no likelihood of an alternate syntax need not
+   define these and need not use asm_fprintf.  */
+
+/* The prefix for register names.  Note that REGISTER_NAMES
+   is supposed to include this prefix. Also note that this is NOT an
+   fprintf format string, it is a literal string */
+
+#undef REGISTER_PREFIX
+#define REGISTER_PREFIX "%"
+
+/* The prefix for local (compiler generated) labels.
+   These labels will not appear in the symbol table. */
+
+#undef LOCAL_LABEL_PREFIX
+#define LOCAL_LABEL_PREFIX "."
+
+/* The prefix to add to user-visible assembler symbols. */
+
+#undef USER_LABEL_PREFIX
+#define USER_LABEL_PREFIX ""
+
+/* How to refer to registers in assembler output.
+   This sequence is indexed by compiler's hard-register-number.
+   Motorola format uses different register names than defined in m68k.h. */
+
+#undef REGISTER_NAMES
+
+#ifndef SUPPORT_SUN_FPA
+
+#define REGISTER_NAMES \
+{"%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7", \
+ "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%a6", "%sp", \
+ "%fp0", "%fp1", "%fp2", "%fp3", "%fp4", "%fp5", "%fp6", "%fp7" }
+
+#else /* SUPPORTED_SUN_FPA */
+
+#define REGISTER_NAMES \
+{"%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7", \
+ "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%a6", "%sp", \
+ "%fp0", "%fp1", "%fp2", "%fp3", "%fp4", "%fp5", "%fp6", "%fp7", \
+ "%fpa0", "%fpa1", "%fpa2", "%fpa3", "%fpa4", "%fpa5", "%fpa6", "%fpa7", \
+ "%fpa8", "%fpa9", "%fpa10","%fpa11","%fpa12","%fpa13","%fpa14","%fpa15", \
+ "%fpa16","%fpa17","%fpa18","%fpa19","%fpa20","%fpa21","%fpa22","%fpa23", \
+ "%fpa24","%fpa25","%fpa26","%fpa27","%fpa28","%fpa29","%fpa30","%fpa31" }
+
+#endif /* defined SUPPORT_SUN_FPA */
+
+#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 ASM_SPEC
+#define ASM_SPEC "%{m68030} %{m68040} %{fpic:-k} %{fPIC:-k}"
+
+#define CPP_PREDEFINES \
+  "-D__ELF__ -Dunix -Dmc68000 -Dmc68020 -Dlinux -Asystem(unix) -Asystem(posix) -Acpu(m68k) -Amachine(m68k)"
+
+#undef CPP_SPEC
+#if TARGET_DEFAULT & 2
+#define CPP_SPEC \
+  "%{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{!msoft-float:-D__HAVE_68881__} %{posix:-D_POSIX_SOURCE}"
+#else
+#define CPP_SPEC \
+  "%{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{m68881:-D__HAVE_68881__} %{posix:-D_POSIX_SOURCE}"
+#endif
+
+#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 Linux C library, please add -lc_p or -ggdb
+   to LDFLAGS at the link time, respectively.  */
+#define LIB_SPEC \
+  "%{!shared:%{!symbolic: %{mieee-fp:-lieee} %{p:-lgmon} %{pg:-lgmon} \
+     %{!ggdb:-lc} %{ggdb:-lg}}}"
+#else
+#define LIB_SPEC \
+  "%{!shared:%{!symbolic: \
+     %{mieee-fp:-lieee} %{p:-lgmon -lc_p} %{pg:-lgmon -lc_p} \
+     %{!p:%{!pg:%{!g*:-lc} %{g*:-lg}}}}}"
+#endif
+
+/* 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
+#ifndef LINUX_DEFAULT_ELF
+#define LINK_SPEC "-m m68kelf %{shared} %{symbolic:-shared -Bsymbolic} \
+  %{!shared:%{!symbolic: \
+    %{!static: \
+      %{rdynamic:-export-dynamic} \
+      %{!dynamic-linker*:-dynamic-linker /lib/elf/ld-linux.so.1} \
+      %{!rpath*:-rpath /lib/elf/}} %{static}}}"
+#else
+#define LINK_SPEC "-m m68kelf %{shared} %{symbolic:-shared -Bsymbolic} \
+  %{!shared:%{!symbolic: \
+    %{!static: \
+      %{rdynamic:-export-dynamic} \
+      %{!dynamic-linker*:-dynamic-linker /lib/ld-linux.so.1}} \
+    %{static}}}"
+#endif
+
+/* For compatibility with linux/a.out */
+
+#undef PCC_BITFIELD_TYPE_MATTERS
+
+/* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
+   keep switch tables in the text section.  */
+   
+#define JUMP_TABLES_IN_TEXT_SECTION 1
+
+/* Use the default action for outputting the case label.  */
+#undef ASM_OUTPUT_CASE_LABEL
+
+#define ASM_RETURN_CASE_JUMP \
+  return "jmp (2,%%pc,%0.w)"
+
+/* This is how to output an assembler line that says to advance the
+   location counter to a multiple of 2**LOG bytes.  */
+
+#undef ASM_OUTPUT_ALIGN
+#define ASM_OUTPUT_ALIGN(FILE,LOG)				\
+  if ((LOG) > 0)						\
+    fprintf ((FILE), "\t%s \t%u\n", ALIGN_ASM_OP, 1 << (LOG));
+
+/* Output assembler code to FILE to increment profiler label # LABELNO
+   for profiling a function entry.  */
+
+#undef FUNCTION_PROFILER
+#define FUNCTION_PROFILER(FILE, LABELNO) \
+{									\
+  asm_fprintf (FILE, "\tlea (%LLP%d,%Rpc),%Ra1\n", (LABELNO));		\
+  if (flag_pic)								\
+    fprintf (FILE, "\tbsr.l _mcount@PLTPC\n");				\
+  else									\
+    fprintf (FILE, "\tjbsr _mcount\n");					\
+}
+
+/* How to renumber registers for dbx and gdb.
+   On the Sun-3, the floating point registers have numbers
+   18 to 25, not 16 to 23 as they do in the compiler.  */
+
+#define DBX_REGISTER_NUMBER(REGNO) ((REGNO) < 16 ? (REGNO) : (REGNO) + 2)
+
+/* Do not break .stabs pseudos into continuations.  */
+
+#define DBX_CONTIN_LENGTH 0
+
+/* Allow folding division by zero.  */
+#define REAL_INFINITY
+
+/* 1 if N is a possible register number for a function value.  For
+   m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral,
+   pointer, or floating types, respectively.  Reject fp0 if not using
+   a 68881 coprocessor.  */
+
+#undef FUNCTION_VALUE_REGNO_P
+#define FUNCTION_VALUE_REGNO_P(N) \
+  ((N) == 0 || (N) == 8 || (TARGET_68881 && (N) == 16))
+
+/* Define this to be true when FUNCTION_VALUE_REGNO_P is true for
+   more than one register.  */
+
+#undef NEEDS_UNTYPED_CALL
+#define NEEDS_UNTYPED_CALL 1
+
+/* Define how to generate (in the callee) the output value of a
+   function and how to find (in the caller) the value returned by a
+   function.  VALTYPE is the data type of the value (as a tree).  If
+   the precise function being called is known, FUNC is its
+   FUNCTION_DECL; otherwise, FUNC is 0.  For m68k/SVR4 generate the
+   result in d0, a0, or fp0 as appropriate. */
+   
+#undef FUNCTION_VALUE
+#define FUNCTION_VALUE(VALTYPE, FUNC)					\
+  (TREE_CODE (VALTYPE) == REAL_TYPE && TARGET_68881			\
+   ? gen_rtx (REG, TYPE_MODE (VALTYPE), 16)				\
+   : (POINTER_TYPE_P (VALTYPE)						\
+      ? gen_rtx (REG, TYPE_MODE (VALTYPE), 8)				\
+      : gen_rtx (REG, TYPE_MODE (VALTYPE), 0)))
+
+/* For compatibility with the large body of existing code which does
+   not always properly declare external functions returning pointer
+   types, the m68k/SVR4 convention is to copy the value returned for
+   pointer functions from a0 to d0 in the function epilogue, so that
+   callers that have neglected to properly declare the callee can
+   still find the correct return value.  */
+
+extern int current_function_returns_pointer;
+#define FUNCTION_EXTRA_EPILOGUE(FILE, SIZE)				\
+do {									\
+  if ((current_function_returns_pointer) && 				\
+      ! find_equiv_reg (0, get_last_insn (), 0, 0, 0, 8, Pmode))	\
+    asm_fprintf (FILE, "\tmove.l %Ra0,%Rd0\n");				\
+} while (0);
+
+/* Define how to find the value returned by a library function
+   assuming the value has mode MODE.
+   For m68k/SVR4 look for integer values in d0, pointer values in d0
+   (returned in both d0 and a0), and floating values in fp0.  */
+
+#undef LIBCALL_VALUE
+#define LIBCALL_VALUE(MODE)						\
+  (((MODE) == SFmode || (MODE) == DFmode) && TARGET_68881		\
+   ? gen_rtx (REG, (MODE), 16)						\
+   : gen_rtx (REG, (MODE), 0))
+
+/* In m68k svr4, a symbol_ref rtx can be a valid PIC operand if it is
+   an operand of a function call. */
+#undef LEGITIMATE_PIC_OPERAND_P
+#define LEGITIMATE_PIC_OPERAND_P(X) \
+  (! symbolic_operand (X, VOIDmode) \
+   || (GET_CODE (X) == SYMBOL_REF && SYMBOL_REF_FLAG (X)))
+
+/* Turn off function cse if we are doing PIC. We always want function
+   call to be done as `bsr foo@PLTPC', so it will force the assembler
+   to create the PLT entry for `foo'.  Doing function cse will cause
+   the address of `foo' to be loaded into a register, which is exactly
+   what we want to avoid when we are doing PIC on svr4 m68k.  */
+#undef SUBTARGET_OVERRIDE_OPTIONS
+#define SUBTARGET_OVERRIDE_OPTIONS \
+  if (flag_pic) flag_no_function_cse = 1;
+
+/* For m68k SVR4, structures are returned using the reentrant
+   technique. */
+#undef PCC_STATIC_STRUCT_RETURN
+#define DEFAULT_PCC_STRUCT_RETURN 0