gcc/config/sparc/sol2.h

/* Definitions of target machine for GNU compiler, for SPARC running Solaris 2
   Copyright 1992, 1995, 1996, 1997, 1998, 1999, 2000,
   2001 Free Software Foundation, Inc.
   Contributed by Ron Guilmette (rfg@netcom.com).
   Additional changes by David V. Henkel-Wallace (gumby@cygnus.com).

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 2, 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.  */

/* Supposedly the same as vanilla sparc svr4, except for the stuff below: */

/* Solaris 2 uses a wint_t different from the default. This is required
   by the SCD 2.4.1, p. 6-83, Figure 6-66.  */
#undef	WINT_TYPE
#define	WINT_TYPE "long int"

#undef	WINT_TYPE_SIZE
#define	WINT_TYPE_SIZE BITS_PER_WORD

#undef CPP_PREDEFINES
#define CPP_PREDEFINES \
"-Dsparc -Dsun -Dunix -D__svr4__ -D__SVR4 \
-Asystem=unix -Asystem=svr4"

#undef CPP_SUBTARGET_SPEC
#define CPP_SUBTARGET_SPEC "\
%{pthreads:-D_REENTRANT -D_PTHREADS} \
%{!pthreads:%{threads:-D_REENTRANT -D_SOLARIS_THREADS}} \
%{compat-bsd:-iwithprefixbefore ucbinclude -I/usr/ucbinclude} \
"

/* For C++ we need to add some additional macro definitions required
   by the C++ standard library.  */
#define CPLUSPLUS_CPP_SPEC "\
-D_XOPEN_SOURCE=500 -D_LARGEFILE_SOURCE=1 -D_LARGEFILE64_SOURCE=1 \
-D__EXTENSIONS__ \
%(cpp) \
"

/* The sun bundled assembler doesn't accept -Yd, (and neither does gas).
   It's safe to pass -s always, even if -g is not used.  */
#undef ASM_SPEC
#define ASM_SPEC "\
%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Wa,*:%*} -s \
%{fpic:-K PIC} %{fPIC:-K PIC} \
%(asm_cpu) \
"

/* This is here rather than in sparc.h because it's not known what
   other assemblers will accept.  */
#if TARGET_CPU_DEFAULT == TARGET_CPU_v9
#undef ASM_CPU_DEFAULT_SPEC
#define ASM_CPU_DEFAULT_SPEC "-xarch=v8plus"
#endif
#if TARGET_CPU_DEFAULT == TARGET_CPU_ultrasparc
#undef ASM_CPU_DEFAULT_SPEC
#define ASM_CPU_DEFAULT_SPEC "-xarch=v8plusa"
#endif
#undef ASM_CPU_SPEC
#define ASM_CPU_SPEC "\
%{mcpu=v8plus:-xarch=v8plus} \
%{mcpu=ultrasparc:-xarch=v8plusa} \
%{!mcpu*:%(asm_cpu_default)} \
"

/* However it appears that Solaris 2.0 uses the same reg numbering as
   the old BSD-style system did.  */

#undef DBX_REGISTER_NUMBER
/* Same as sparc.h */
#define DBX_REGISTER_NUMBER(REGNO) \
  (TARGET_FLAT && REGNO == FRAME_POINTER_REGNUM ? 31 : REGNO)

/* We use stabs-in-elf for debugging, because that is what the native
   toolchain uses.  */
#undef PREFERRED_DEBUGGING_TYPE
#define PREFERRED_DEBUGGING_TYPE DBX_DEBUG

/* The Solaris 2 assembler uses .skip, not .zero, so put this back.  */
#undef ASM_OUTPUT_SKIP
#define ASM_OUTPUT_SKIP(FILE,SIZE)  \
  fprintf (FILE, "\t.skip %u\n", (SIZE))

/* This is how to output a definition of an internal numbered label where
   PREFIX is the class of label and NUM is the number within the class.  */

#undef  ASM_OUTPUT_INTERNAL_LABEL
#define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM)	\
  fprintf (FILE, ".L%s%d:\n", PREFIX, NUM)

/* This is how to output a reference to an internal numbered label where
   PREFIX is the class of label and NUM is the number within the class.  */

#undef  ASM_OUTPUT_INTERNAL_LABELREF
#define ASM_OUTPUT_INTERNAL_LABELREF(FILE,PREFIX,NUM)	\
  fprintf (FILE, ".L%s%d", PREFIX, NUM)

/* This is how to store into the string LABEL
   the symbol_ref name of an internal numbered label where
   PREFIX is the class of label and NUM is the number within the class.
   This is suitable for output with `assemble_name'.  */

#undef  ASM_GENERATE_INTERNAL_LABEL
#define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)	\
  sprintf ((LABEL), "*.L%s%ld", (PREFIX), (long)(NUM))


/* We don't use the standard svr4 STARTFILE_SPEC because it's wrong for us.
   We don't use the standard LIB_SPEC only because we don't yet support c++ */

#undef STARTFILE_SPEC
#define STARTFILE_SPEC "%{!shared: \
			 %{!symbolic: \
			  %{p:mcrt1.o%s} \
                          %{!p: \
	                    %{pg:gcrt1.o%s gmon.o%s} \
                            %{!pg:crt1.o%s}}}} \
			crti.o%s \
			%{ansi:values-Xc.o%s} \
			%{!ansi: \
			 %{traditional:values-Xt.o%s} \
			 %{!traditional:values-Xa.o%s}} \
			crtbegin.o%s"

/* ??? Note: in order for -compat-bsd to work fully,
   we must somehow arrange to fixincludes /usr/ucbinclude
   and put the result in $(libsubdir)/ucbinclude.  */

#undef LIB_SPEC
#define LIB_SPEC \
  "%{compat-bsd:-lucb -lsocket -lnsl -lelf -laio} \
   %{!shared:\
     %{!symbolic:\
       %{pthreads:-lpthread} \
       %{!pthreads:%{threads:-lthread}} \
       %{p|pg:-ldl} -lc}}"

#undef  ENDFILE_SPEC
#define ENDFILE_SPEC "crtend.o%s crtn.o%s"

/* This should be the same as in svr4.h, except with -R added.  */
#undef LINK_SPEC
#define LINK_SPEC \
  "%{h*} %{v:-V} \
   %{b} %{Wl,*:%*} \
   %{static:-dn -Bstatic} \
   %{shared:-G -dy %{!mimpure-text:-z text}} \
   %{symbolic:-Bsymbolic -G -dy -z text} \
   %{G:-G} \
   %{YP,*} \
   %{R*} \
   %{compat-bsd: \
     %{!YP,*:%{pg:-Y P,/usr/ucblib:/usr/ccs/lib/libp:/usr/lib/libp:/usr/ccs/lib:/usr/lib} \
             %{!pg:%{p:-Y P,/usr/ucblib:/usr/ccs/lib/libp:/usr/lib/libp:/usr/ccs/lib:/usr/lib} \
                   %{!p:-Y P,/usr/ucblib:/usr/ccs/lib:/usr/lib}}} \
             -R /usr/ucblib} \
   %{!compat-bsd: \
     %{!YP,*:%{pg:-Y P,/usr/ccs/lib/libp:/usr/lib/libp:/usr/ccs/lib:/usr/lib} \
             %{!pg:%{p:-Y P,/usr/ccs/lib/libp:/usr/lib/libp:/usr/ccs/lib:/usr/lib} \
                   %{!p:-Y P,/usr/ccs/lib:/usr/lib}}}} \
   %{Qy:} %{!Qn:-Qy}"

/* This defines which switch letters take arguments.
   It is as in svr4.h but with -R added.  */

#undef SWITCH_TAKES_ARG
#define SWITCH_TAKES_ARG(CHAR) \
  (DEFAULT_SWITCH_TAKES_ARG(CHAR) \
   || (CHAR) == 'R' \
   || (CHAR) == 'h' \
   || (CHAR) == 'x' \
   || (CHAR) == 'z')

/* Select a format to encode pointers in exception handling data.  CODE
   is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
   true if the symbol may be affected by dynamic relocations.

   Some Solaris dynamic linkers don't handle unaligned section relative
   relocs properly, so force them to be aligned.  */
#ifndef HAVE_AS_SPARC_UA_PCREL
#define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)		\
  ((flag_pic || GLOBAL) ? DW_EH_PE_aligned : DW_EH_PE_absptr)
#endif

/* ??? This does not work in SunOS 4.x, so it is not enabled in sparc.h.
   Instead, it is enabled here, because it does work under Solaris.  */
/* Define for support of TFmode long double and REAL_ARITHMETIC.
   Sparc ABI says that long double is 4 words.  */
#define LONG_DOUBLE_TYPE_SIZE 128

/* But indicate that it isn't supported by the hardware.  */
#define WIDEST_HARDWARE_FP_SIZE 64

#define STDC_0_IN_SYSTEM_HEADERS 1

#define MULDI3_LIBCALL "__mul64"
#define DIVDI3_LIBCALL "__div64"
#define UDIVDI3_LIBCALL "__udiv64"
#define MODDI3_LIBCALL "__rem64"
#define UMODDI3_LIBCALL "__urem64"

#undef INIT_SUBTARGET_OPTABS
#define INIT_SUBTARGET_OPTABS						\
  fixsfdi_libfunc							\
    = init_one_libfunc (TARGET_ARCH64 ? "__ftol" : "__ftoll");		\
  fixunssfdi_libfunc							\
    = init_one_libfunc (TARGET_ARCH64 ? "__ftoul" : "__ftoull");	\
  fixdfdi_libfunc							\
    = init_one_libfunc (TARGET_ARCH64 ? "__dtol" : "__dtoll");		\
  fixunsdfdi_libfunc							\
    = init_one_libfunc (TARGET_ARCH64 ? "__dtoul" : "__dtoull")

/* Solaris allows 64 bit out and global registers in 32 bit mode.
   sparc_override_options will disable V8+ if not generating V9 code.  */
#undef TARGET_DEFAULT
#define TARGET_DEFAULT (MASK_EPILOGUE + MASK_FPU + MASK_V8PLUS + MASK_LONG_DOUBLE_128)

/*
 * Attempt to turn on access permissions for the stack.
 *
 * This code must be defined when compiling gcc but not when compiling
 * libgcc2.a, unless we're generating code for 64 bits SPARC
 *
 * _SC_STACK_PROT is only defined for post 2.6, but we want this code
 * to run always.  2.6 can change the stack protection but has no way to
 * query it.
 *
 */

/* This declares mprotect (used in TRANSFER_FROM_TRAMPOLINE) for
   libgcc2.c.  */
#ifdef L_trampoline
#include <sys/mman.h>
#endif

#define TRANSFER_FROM_TRAMPOLINE					\
static int need_enable_exec_stack;					\
									\
static void check_enabling(void) __attribute__ ((constructor));		\
static void check_enabling(void)					\
{									\
  extern long sysconf(int);						\
									\
  int prot = (int) sysconf(515 /*_SC_STACK_PROT */);			\
  if (prot != 7)							\
    need_enable_exec_stack = 1;						\
}									\
									\
extern void __enable_execute_stack (void *);				\
void									\
__enable_execute_stack (addr)						\
     void *addr;							\
{									\
  if (!need_enable_exec_stack)						\
    return;								\
  else {								\
    long size = getpagesize ();						\
    long mask = ~(size-1);						\
    char *page = (char *) (((long) addr) & mask); 			\
    char *end  = (char *) ((((long) (addr + TRAMPOLINE_SIZE)) & mask) + size); \
									\
    /* 7 is PROT_READ | PROT_WRITE | PROT_EXEC */ 			\
    if (mprotect (page, end - page, 7) < 0)				\
      perror ("mprotect of trampoline code");				\
  }									\
}