| /* |
| 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 |