2c8ec431e3
h Added -mpcrel flag, and underlying support for PC-relative addressing on m68k. Patch is tested, and approved by Jim Wilson. From-SVN: r27576
389 lines
14 KiB
C
389 lines
14 KiB
C
/* Definitions for Motorola 68k running Linux-based GNU systems with
|
||
ELF format.
|
||
Copyright (C) 1995, 1996, 1997 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>
|
||
|
||
/* Make sure CC1 is undefined. */
|
||
#undef CC1_SPEC
|
||
|
||
#include <linux.h> /* some common stuff */
|
||
|
||
#undef TARGET_VERSION
|
||
#define TARGET_VERSION fprintf (stderr, " (68k GNU/Linux with ELF)");
|
||
|
||
/* 68020 with 68881 */
|
||
#define TARGET_DEFAULT (MASK_BITFIELD|MASK_68881|MASK_68020)
|
||
|
||
/* for 68k machines this only needs to be TRUE for the 68000 */
|
||
|
||
#undef STRICT_ALIGNMENT
|
||
#define STRICT_ALIGNMENT 0
|
||
|
||
#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 ""
|
||
|
||
#define ASM_COMMENT_START "|"
|
||
|
||
/* 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
|
||
|
||
#define CPP_PREDEFINES \
|
||
"-D__ELF__ -Dunix -Dmc68000 -Dmc68020 -Dlinux -Asystem(unix) -Asystem(posix) -Acpu(m68k) -Amachine(m68k)"
|
||
|
||
#undef CPP_SPEC
|
||
#ifdef USE_GNULIBC_1
|
||
#if TARGET_DEFAULT & MASK_68881
|
||
#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
|
||
#else
|
||
#if TARGET_DEFAULT & MASK_68881
|
||
#define CPP_SPEC \
|
||
"%{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{!msoft-float:-D__HAVE_68881__} %{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
|
||
#else
|
||
#define CPP_SPEC \
|
||
"%{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{m68881:-D__HAVE_68881__} %{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
|
||
#endif
|
||
#endif
|
||
|
||
/* We override the ASM_SPEC from svr4.h because we must pass -m68040 down
|
||
to the assembler. */
|
||
#undef ASM_SPEC
|
||
#define ASM_SPEC \
|
||
"%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*} \
|
||
%{m68040} %{m68060:-m68040}"
|
||
|
||
/* Provide a LINK_SPEC appropriate for GNU/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 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
|
||
#else
|
||
#define LINK_SPEC "-m m68kelf %{shared} \
|
||
%{!shared: \
|
||
%{!static: \
|
||
%{rdynamic:-export-dynamic} \
|
||
%{!dynamic-linker*:-dynamic-linker /lib/ld.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 \
|
||
do { \
|
||
if (TARGET_5200) \
|
||
return "ext%.l %0\n\tjmp %%pc@(2,%0:l)"; \
|
||
else \
|
||
return "jmp %%pc@(2,%0:w)"; \
|
||
} while (0)
|
||
|
||
/* 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));
|
||
|
||
/* If defined, a C expression whose value is a string containing the
|
||
assembler operation to identify the following data as uninitialized global
|
||
data. */
|
||
|
||
#define BSS_SECTION_ASM_OP ".section\t.bss"
|
||
|
||
/* 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)
|
||
|
||
/* 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 || (MODE) == XFmode) \
|
||
&& 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) == CONST_DOUBLE && CONST_DOUBLE_MEM (X) \
|
||
&& GET_CODE (CONST_DOUBLE_MEM (X)) == MEM \
|
||
&& symbolic_operand (XEXP (CONST_DOUBLE_MEM (X), 0), VOIDmode))) \
|
||
|| (GET_CODE (X) == SYMBOL_REF && SYMBOL_REF_FLAG (X)) \
|
||
|| PCREL_GENERAL_OPERAND_OK)
|
||
|
||
/* 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
|
||
|
||
/* Finalize the trampoline by flushing the insn cache. */
|
||
|
||
#undef FINALIZE_TRAMPOLINE
|
||
#define FINALIZE_TRAMPOLINE(TRAMP) \
|
||
emit_library_call (gen_rtx_SYMBOL_REF (Pmode, "__clear_cache"), \
|
||
0, VOIDmode, 2, TRAMP, Pmode, \
|
||
plus_constant (TRAMP, TRAMPOLINE_SIZE), Pmode);
|
||
|
||
/* Clear the instruction cache from `beg' to `end'. This makes an
|
||
inline system call to SYS_cacheflush. The arguments are as
|
||
follows:
|
||
|
||
cacheflush (addr, scope, cache, len)
|
||
|
||
addr - the start address for the flush
|
||
scope - the scope of the flush (see the cpush insn)
|
||
cache - which cache to flush (see the cpush insn)
|
||
len - a factor relating to the number of flushes to perform:
|
||
len/16 lines, or len/4096 pages. */
|
||
|
||
#define CLEAR_INSN_CACHE(BEG, END) \
|
||
{ \
|
||
register unsigned long _beg __asm ("%d1") = (unsigned long) (BEG); \
|
||
unsigned long _end = (unsigned long) (END); \
|
||
register unsigned long _len __asm ("%d4") = (_end - _beg + 32); \
|
||
__asm __volatile \
|
||
("move%.l %#123, %/d0\n\t" /* system call nr */ \
|
||
"move%.l %#1, %/d2\n\t" /* clear lines */ \
|
||
"move%.l %#3, %/d3\n\t" /* insn+data caches */ \
|
||
"trap %#0" \
|
||
: /* no outputs */ \
|
||
: "d" (_beg), "d" (_len) \
|
||
: "%d0", "%d2", "%d3"); \
|
||
}
|
||
|
||
/* Output code to add DELTA to the first argument, and then jump to FUNCTION.
|
||
Used for C++ multiple inheritance. */
|
||
#define ASM_OUTPUT_MI_THUNK(FILE, THUNK_FNDECL, DELTA, FUNCTION) \
|
||
do { \
|
||
if (DELTA > 0 && DELTA <= 8) \
|
||
asm_fprintf (FILE, "\taddq.l %I%d,4(%Rsp)\n", DELTA); \
|
||
else if (DELTA < 0 && DELTA >= -8) \
|
||
asm_fprintf (FILE, "\tsubq.l %I%d,4(%Rsp)\n", -DELTA); \
|
||
else \
|
||
asm_fprintf (FILE, "\tadd.l %I%d,4(%Rsp)\n", DELTA); \
|
||
\
|
||
if (flag_pic) \
|
||
{ \
|
||
fprintf (FILE, "\tbra.l "); \
|
||
assemble_name (FILE, XSTR (XEXP (DECL_RTL (FUNCTION), 0), 0)); \
|
||
fprintf (FILE, "@PLTPC\n"); \
|
||
} \
|
||
else \
|
||
{ \
|
||
fprintf (FILE, "\tjmp "); \
|
||
assemble_name (FILE, XSTR (XEXP (DECL_RTL (FUNCTION), 0), 0)); \
|
||
fprintf (FILE, "\n"); \
|
||
} \
|
||
} while (0)
|