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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [config/] [arm/] [netbsd-elf.h] - Blame information for rev 282

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1 282 jeremybenn
/* Definitions of target machine for GNU compiler, NetBSD/arm ELF version.
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   Copyright (C) 2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
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   Contributed by Wasabi Systems, Inc.
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   This file is part of GCC.
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   GCC is free software; you can redistribute it and/or modify it
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   under the terms of the GNU General Public License as published
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   by the Free Software Foundation; either version 3, or (at your
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   option) any later version.
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   GCC is distributed in the hope that it will be useful, but WITHOUT
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   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
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   License for more details.
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   You should have received a copy of the GNU General Public License
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   along with GCC; see the file COPYING3.  If not see
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   <http://www.gnu.org/licenses/>.  */
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/* Run-time Target Specification.  */
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#undef TARGET_VERSION
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#define TARGET_VERSION fputs (" (NetBSD/arm ELF)", stderr);
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/* arm.h defaults to ARM6 CPU.  */
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/* This defaults us to little-endian.  */
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#ifndef TARGET_ENDIAN_DEFAULT
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#define TARGET_ENDIAN_DEFAULT 0
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#endif
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#undef MULTILIB_DEFAULTS
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/* Default it to use ATPCS with soft-VFP.  */
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#undef TARGET_DEFAULT
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#define TARGET_DEFAULT                  \
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  (MASK_APCS_FRAME                      \
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   | TARGET_ENDIAN_DEFAULT)
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#undef ARM_DEFAULT_ABI
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#define ARM_DEFAULT_ABI ARM_ABI_ATPCS
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#define TARGET_OS_CPP_BUILTINS()        \
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  do                                    \
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    {                                   \
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      NETBSD_OS_CPP_BUILTINS_ELF();     \
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    }                                   \
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  while (0)
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#undef SUBTARGET_CPP_SPEC
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#define SUBTARGET_CPP_SPEC NETBSD_CPP_SPEC
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#undef SUBTARGET_EXTRA_ASM_SPEC
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#define SUBTARGET_EXTRA_ASM_SPEC        \
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  "-matpcs %{fpic|fpie:-k} %{fPIC|fPIE:-k}"
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/* Default to full VFP if -mhard-float is specified.  */
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#undef SUBTARGET_ASM_FLOAT_SPEC
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#define SUBTARGET_ASM_FLOAT_SPEC        \
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  "%{mhard-float:{!mfpu=*:-mfpu=vfp}}   \
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   %{mfloat-abi=hard:{!mfpu=*:-mfpu=vfp}}"
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#undef SUBTARGET_EXTRA_SPECS
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#define SUBTARGET_EXTRA_SPECS                           \
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  { "subtarget_extra_asm_spec", SUBTARGET_EXTRA_ASM_SPEC }, \
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  { "subtarget_asm_float_spec", SUBTARGET_ASM_FLOAT_SPEC }, \
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  { "netbsd_link_spec",         NETBSD_LINK_SPEC_ELF }, \
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  { "netbsd_entry_point",       NETBSD_ENTRY_POINT },
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#define NETBSD_ENTRY_POINT "__start"
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#undef LINK_SPEC
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#define LINK_SPEC \
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  "-X %{mbig-endian:-EB} %{mlittle-endian:-EL} \
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   %(netbsd_link_spec)"
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/* Make GCC agree with <machine/ansi.h>.  */
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#undef SIZE_TYPE
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#define SIZE_TYPE "long unsigned int"
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#undef PTRDIFF_TYPE
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#define PTRDIFF_TYPE "long int"
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/* We don't have any limit on the length as out debugger is GDB.  */
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#undef DBX_CONTIN_LENGTH
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/* NetBSD does its profiling differently to the Acorn compiler. We
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   don't need a word following the mcount call; and to skip it
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   requires either an assembly stub or use of fomit-frame-pointer when
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   compiling the profiling functions.  Since we break Acorn CC
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   compatibility below a little more won't hurt.  */
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#undef ARM_FUNCTION_PROFILER                                  
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#define ARM_FUNCTION_PROFILER(STREAM,LABELNO)           \
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{                                                       \
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  asm_fprintf (STREAM, "\tmov\t%Rip, %Rlr\n");          \
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  asm_fprintf (STREAM, "\tbl\t__mcount%s\n",            \
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               (TARGET_ARM && NEED_PLT_RELOC)           \
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               ? "(PLT)" : "");                         \
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}
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/* VERY BIG NOTE: Change of structure alignment for NetBSD/arm.
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   There are consequences you should be aware of...
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   Normally GCC/arm uses a structure alignment of 32 for compatibility
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   with armcc.  This means that structures are padded to a word
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   boundary.  However this causes problems with bugged NetBSD kernel
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   code (possibly userland code as well - I have not checked every
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   binary).  The nature of this bugged code is to rely on sizeof()
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   returning the correct size of various structures rounded to the
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   nearest byte (SCSI and ether code are two examples, the vm system
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   is another).  This code breaks when the structure alignment is 32
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   as sizeof() will report a word=rounded size.  By changing the
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   structure alignment to 8. GCC will conform to what is expected by
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   NetBSD.
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   This has several side effects that should be considered.
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   1. Structures will only be aligned to the size of the largest member.
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      i.e. structures containing only bytes will be byte aligned.
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           structures containing shorts will be half word aligned.
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           structures containing ints will be word aligned.
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      This means structures should be padded to a word boundary if
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      alignment of 32 is required for byte structures etc.
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   2. A potential performance penalty may exist if strings are no longer
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      word aligned.  GCC will not be able to use word load/stores to copy
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      short strings.
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   This modification is not encouraged but with the present state of the
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   NetBSD source tree it is currently the only solution that meets the
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   requirements.  */
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#undef DEFAULT_STRUCTURE_SIZE_BOUNDARY
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#define DEFAULT_STRUCTURE_SIZE_BOUNDARY 8
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/* Clear the instruction cache from `BEG' to `END'.  This makes a
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   call to the ARM_SYNC_ICACHE architecture specific syscall.  */
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#define CLEAR_INSN_CACHE(BEG, END)                                      \
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do                                                                      \
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  {                                                                     \
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    extern int sysarch(int number, void *args);                         \
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    struct                                                              \
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      {                                                                 \
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        unsigned int addr;                                              \
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        int          len;                                               \
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      } s;                                                              \
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    s.addr = (unsigned int)(BEG);                                       \
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    s.len = (END) - (BEG);                                              \
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    (void) sysarch (0, &s);                                              \
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  }                                                                     \
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while (0)
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#undef FPUTYPE_DEFAULT
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#define FPUTYPE_DEFAULT "vfp"
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