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Diffstat (limited to 'contrib/gcc/config/arm/netbsd.h')
| -rw-r--r-- | contrib/gcc/config/arm/netbsd.h | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/contrib/gcc/config/arm/netbsd.h b/contrib/gcc/config/arm/netbsd.h new file mode 100644 index 000000000000..74f32e805ea0 --- /dev/null +++ b/contrib/gcc/config/arm/netbsd.h @@ -0,0 +1,153 @@ +/* NetBSD/arm (RiscBSD) version. + Copyright (C) 1993, 1994, 1997, 1998 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, 59 Temple Place - Suite 330, +Boston, MA 02111-1307, USA. */ + +/* Run-time Target Specification. */ +#undef TARGET_VERSION +#define TARGET_VERSION fputs (" (ARM/NetBSD)", stderr); + +/* This is used in ASM_FILE_START. */ +#undef ARM_OS_NAME +#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. */ +#undef TARGET_DEFAULT +#define TARGET_DEFAULT (ARM_FLAG_APCS_32 | ARM_FLAG_SOFT_FLOAT | ARM_FLAG_APCS_FRAME) + +/* 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__arm__ -D__NetBSD__ \ +-Asystem=unix -Asystem=NetBSD" + +/* 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__" + +/* Because TARGET_DEFAULT sets ARM_FLAG_SOFT_FLOAT */ +#undef CPP_FLOAT_DEFAULT_SPEC +#define CPP_FLOAT_DEFAULT_SPEC "-D__SOFTFP__" + +/* Pass -X to the linker so that it will strip symbols starting with 'L' */ +#undef LINK_SPEC +#define LINK_SPEC "\ +-X %{!shared:%{!nostdlib:%{!r*:%{!e*:-e start}}} -dc -dp %{R*} \ +%{static:-Bstatic}} %{shared} %{assert*} \ +" + +#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 ARM_FUNCTION_PROFILER +#define ARM_FUNCTION_PROFILER(STREAM,LABELNO) \ +{ \ + fprintf(STREAM, "\tmov\t%sip, %slr\n", REGISTER_PREFIX, REGISTER_PREFIX); \ + fprintf(STREAM, "\tbl\tmcount\n"); \ +} + +/* On the ARM `@' introduces a comment, so we must use something else + for .type directives. */ +#undef TYPE_OPERAND_FMT +#define TYPE_OPERAND_FMT "%%%s" + +/* NetBSD uses the old PCC style aggregate returning conventions. */ +#undef DEFAULT_PCC_STRUCT_RETURN +#define DEFAULT_PCC_STRUCT_RETURN 1 + +/* Although not normally relevant (since by default, all aggregates + are returned in memory) compiling some parts of libc requires + non-APCS style struct returns. */ +#undef RETURN_IN_MEMORY + +/* 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 + boundary. 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 boundary 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 DEFAULT_STRUCTURE_SIZE_BOUNDARY +#define DEFAULT_STRUCTURE_SIZE_BOUNDARY 8 |