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- /* 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
-