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/* Definitions for Motorola 68k running Linux-based GNU systems with
ELF format.
Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2003, 2004
Free Software Foundation, Inc.
This file is part of GCC.
GCC 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.
GCC 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 GCC; see the file COPYING. If not, write to
the Free Software Foundation, 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA. */
#define TARGET_VERSION fprintf (stderr, " (68k GNU/Linux with ELF)");
/* Default to m68040. */
#ifndef TARGET_CPU_DEFAULT
#define TARGET_CPU_DEFAULT TARGET_CPU_m68040
#define ASM_CPU_DEFAULT_SPEC "-mcpu=68040"
#endif
/* ASM_SPEC is set in m68k.h, so we have to set SUBTARGET_ASM_SPEC to
the svr4.h options. We have to undef ASM_SPEC here, so that m68k.h
does not complain. */
#undef ASM_SPEC
#define SUBTARGET_ASM_SPEC \
"%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*}"
/* 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 */
#define REGISTER_PREFIX "%"
/* The prefix for local (compiler generated) labels.
These labels will not appear in the symbol table. */
#define LOCAL_LABEL_PREFIX "."
/* The prefix to add to user-visible assembler symbols. */
#define USER_LABEL_PREFIX ""
#define ASM_COMMENT_START "|"
/* Target OS builtins. */
#define TARGET_OS_CPP_BUILTINS() \
do \
{ \
LINUX_TARGET_OS_CPP_BUILTINS(); \
} \
while (0)
#define TARGET_OBJFMT_CPP_BUILTINS() \
do \
{ \
builtin_define ("__ELF__"); \
} \
while (0)
#define CPP_SPEC \
"%{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
/* 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. */
#define GLIBC_DYNAMIC_LINKER "/lib/ld.so.1"
#undef LINK_SPEC
#define LINK_SPEC "-m m68kelf %{shared} \
%{!shared: \
%{!static: \
%{rdynamic:-export-dynamic} \
%{!dynamic-linker*:-dynamic-linker " LINUX_DYNAMIC_LINKER "}} \
%{static}}"
/* 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 (m68k_arch_coldfire) \
{ \
if (ADDRESS_REG_P (operands[0])) \
return "jmp %%pc@(2,%0:l)"; \
else \
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. */
#define ASM_OUTPUT_ALIGN(FILE,LOG) \
if ((LOG) > 0) \
fprintf ((FILE), "%s%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 "\t.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. */
#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"); \
}
/* Do not break .stabs pseudos into continuations. */
#define DBX_CONTIN_LENGTH 0
/* 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. */
#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. */
#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. */
#define FUNCTION_VALUE(VALTYPE, FUNC) \
m68k_function_value (VALTYPE, FUNC)
/* 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. */
#define LIBCALL_VALUE(MODE) \
m68k_libcall_value (MODE)
/* 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"); \
}
#define TARGET_ASM_FILE_END file_end_indicate_exec_stack
/* glibc uses comments to hide section attributes. So setting
ASM_FILE_START_APP_OFF breaks it. */
#define TARGET_ASM_FILE_START_APP_OFF false
#define MD_UNWIND_SUPPORT "config/m68k/linux-unwind.h"
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