Initial revision

From-SVN: r14458

gcc/config/arm/netbsd.h

+/*
+   NetBSD/arm (RiscBSD) version.
+   Copyright (C) 1993, 1994 Free Software Foundation, Inc.
+   Contributed by Mark Brinicombe (amb@physig.ph.kcl.ac.uk)
+
+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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/* Run-time Target Specification.  */
+#define TARGET_VERSION fputs (" (ARM/NetBSD)", stderr);
+
+/* This is used in ASM_FILE_START.  */
+#define ARM_OS_NAME "NetBSD"
+
+/* Unsigned chars produces much better code than signed.  */
+#define DEFAULT_SIGNED_CHAR  0
+
+/* Since we always use GAS as our assembler we support stabs.  */
+#define DBX_DEBUGGING_INFO 1
+
+/*#undef ASM_DECLARE_FUNCTION_NAME*/
+
+/* ARM6 family default cpu.  */
+#define SUBTARGET_CPU_DEFAULT TARGET_CPU_arm6
+
+/* Default is to use APCS-32 mode.  */
+#define TARGET_DEFAULT ARM_FLAG_APCS_32
+
+#include "arm/aout.h"
+
+/* This gets redefined in config/netbsd.h.  */
+#undef TARGET_MEM_FUNCTIONS
+
+#include <netbsd.h>
+
+/* Some defines for CPP.
+   arm32 is the NetBSD port name, so we always define arm32 and __arm32__.  */
+#undef CPP_PREDEFINES
+#define CPP_PREDEFINES "\
+-Dunix -Driscbsd -Darm32 -D__arm32__ -D__NetBSD__ \
+-Asystem(unix) -Asystem(NetBSD) -Acpu(arm) -Amachine(arm)"
+
+/* Define _POSIX_SOURCE if necessary.  */
+#undef CPP_SPEC
+#define CPP_SPEC "\
+%(cpp_cpu_arch) %(cpp_apcs_pc) %(cpp_float) %(cpp_endian) \
+%{posix:-D_POSIX_SOURCE} \
+"
+
+/* Because TARGET_DEFAULT sets ARM_FLAG_APCS_32 */
+#undef CPP_APCS_PC_DEFAULT_SPEC
+#define CPP_APCS_PC_DEFAULT_SPEC "-D__APCS_32__"
+
+#undef SIZE_TYPE
+#define SIZE_TYPE "unsigned int"
+
+#undef PTRDIFF_TYPE
+#define PTRDIFF_TYPE "int"
+
+#undef WCHAR_TYPE
+#define WCHAR_TYPE "int"
+
+#undef WCHAR_UNSIGNED
+#define WCHAR_UNSIGNED 0
+
+#undef WCHAR_TYPE_SIZE
+#define WCHAR_TYPE_SIZE 32
+
+#define HANDLE_SYSV_PRAGMA
+
+/* We don't have any limit on the length as out debugger is GDB.  */
+#undef DBX_CONTIN_LENGTH
+
+/* NetBSD does its profiling differently to the Acorn compiler. We
+   don't need a word following the mcount call; and to skip it
+   requires either an assembly stub or use of fomit-frame-pointer when
+   compiling the profiling functions.  Since we break Acorn CC
+   compatibility below a little more won't hurt.  */
+
+#undef FUNCTION_PROFILER
+#define FUNCTION_PROFILER(STREAM,LABELNO)  				    \
+{									    \
+  fprintf(STREAM, "\tmov\t%sip, %slr\n", REGISTER_PREFIX, REGISTER_PREFIX); \
+  fprintf(STREAM, "\tbl\tmcount\n");					    \
+}
+
+/* VERY BIG NOTE : Change of structure alignment for RiscBSD.
+   There are consequences you should be aware of...
+
+   Normally GCC/arm uses a structure alignment of 32 for compatibility
+   with armcc.  This means that structures are padded to a word
+   boundry.  However this causes problems with bugged NetBSD kernel
+   code (possibly userland code as well - I have not checked every
+   binary).  The nature of this bugged code is to rely on sizeof()
+   returning the correct size of various structures rounded to the
+   nearest byte (SCSI and ether code are two examples, the vm system
+   is another).  This code breaks when the structure alignment is 32
+   as sizeof() will report a word=rounded size.  By changing the
+   structure alignment to 8. GCC will conform to what is expected by
+   NetBSD.
+
+   This has several side effects that should be considered.
+   1. Structures will only be aligned to the size of the largest member.
+      i.e. structures containing only bytes will be byte aligned.
+           structures containing shorts will be half word alinged.
+           structures containing ints will be word aligned.
+
+      This means structures should be padded to a word boundry if
+      alignment of 32 is required for byte structures etc.
+      
+   2. A potential performance penalty may exist if strings are no longer
+      word aligned.  GCC will not be able to use word load/stores to copy
+      short strings.
+      
+   This modification is not encouraged but with the present state of the
+   NetBSD source tree it is currently the only solution that meets the
+   requirements.  */
+#undef STRUCTURE_SIZE_BOUNDARY
+#define STRUCTURE_SIZE_BOUNDARY 8

gcc/config/arm/t-netbsd

+# Just for these, we omit the frame pointer since it makes such a big
+# difference.  It is then pointless adding debugging.
+LIBGCC2_CFLAGS=-O2 -fomit-frame-pointer $(LIBGCC2_INCLUDES) $(GCC_CFLAGS) -g0
+#     -Dinhibit_libc
+
+# Don't build enquire
+ENQUIRE=
+
+CROSS_LIBGCC1 = libgcc1-asm.a
+LIB1ASMSRC = arm/lib1funcs.asm
+LIB1ASMFUNCS = _udivsi3 _divsi3 _umodsi3 _modsi3 _dvmd_tls