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- $OpenBSD: patch-gcc_config_arm_openbsd_h,v 1.3 2016/09/20 21:51:54 pascal Exp $
- --- gcc/config/arm/openbsd.h.orig Sat Sep 10 02:11:09 2016
- +++ gcc/config/arm/openbsd.h Mon Sep 19 12:22:39 2016
- @@ -0,0 +1,252 @@
- +/* Definitions of target machine for GNU compiler, OpenBSD/arm ELF version.
- + Copyright (C) 2002 Free Software Foundation, Inc.
- + Contributed by Wasabi Systems, Inc.
- +
- +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 (" (OpenBSD/arm)", stderr);
- +
- +/* This is used in ASM_FILE_START. */
- +//#undef ARM_OS_NAME
- +//#define ARM_OS_NAME "OpenBSD"
- +
- +/* Unsigned chars produces much better code than signed. */
- +#define DEFAULT_SIGNED_CHAR 0
- +
- +
- +/* This defaults us to little-endian. */
- +#ifndef TARGET_ENDIAN_DEFAULT
- +#define TARGET_ENDIAN_DEFAULT 0
- +#endif
- +
- +#undef MULTILIB_DEFAULTS
- +
- +/* armv5te default cpu. */
- +#define SUBTARGET_CPU_DEFAULT TARGET_CPU_mpcore
- +
- +/* We default to a soft-float ABI so that binaries can run on all
- + target hardware. */
- +#undef TARGET_DEFAULT_FLOAT_ABI
- +#define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_SOFT
- +
- +/* We default to the "aapcs-linux" ABI so that enums are int-sized by
- + default. */
- +#undef ARM_DEFAULT_ABI
- +#define ARM_DEFAULT_ABI ARM_ABI_AAPCS_LINUX
- +
- +
- +#define TARGET_OS_CPP_BUILTINS() \
- + do \
- + { \
- + builtin_define ("__GXX_MERGED_TYPEINFO_NAMES=0"); \
- + OPENBSD_OS_CPP_BUILTINS_ELF(); \
- + } \
- + while (0)
- +
- +#undef SUBTARGET_CPP_SPEC
- +#define SUBTARGET_CPP_SPEC OBSD_CPP_SPEC
- +
- +/* OBSD_LINK_SPEC appropriate for OpenBSD. Support for GCC options
- + -static, -assert, and -nostdlib. */
- +#undef OBSD_LINK_SPEC
- +#ifdef OBSD_NO_DYNAMIC_LIBRARIES
- +#define OBSD_LINK_SPEC \
- + "%{!nostdlib:%{!r*:%{!e*:-e __start}}} %{assert*}"
- +#else
- +#define OBSD_LINK_SPEC \
- + "%{!shared:%{!nostdlib:%{!r*:%{!e*:-e __start}}}} \
- + %{shared:-shared} %{R*} \
- + %{static:-Bstatic} \
- + %{!static:-Bdynamic} \
- + %{rdynamic:-export-dynamic} \
- + %{assert*} \
- + %{!dynamic-linker:-dynamic-linker /usr/libexec/ld.so}"
- +#endif
- +
- +#undef SUBTARGET_EXTRA_ASM_SPEC
- +#define SUBTARGET_EXTRA_ASM_SPEC \
- + "%{mabi=apcs-gnu|mabi=atpcs:-meabi=gnu;:-meabi=4} %{fpic|fPIC|fpie|fPIE:-k}"
- +
- +/* Default floating point model is soft-VFP.
- + FIXME: -mhard-float currently implies FPA. */
- +#undef SUBTARGET_ASM_FLOAT_SPEC
- +#define SUBTARGET_ASM_FLOAT_SPEC \
- + "%{mhard-float:-mfpu=fpa} \
- + %{msoft-float:-mfpu=softvfp} \
- + %{!mhard-float: \
- + %{!msoft-float:-mfpu=softvfp}}"
- +
- +#undef SUBTARGET_EXTRA_SPECS
- +#define SUBTARGET_EXTRA_SPECS \
- + { "subtarget_extra_asm_spec", SUBTARGET_EXTRA_ASM_SPEC }, \
- + { "subtarget_asm_float_spec", SUBTARGET_ASM_FLOAT_SPEC }, \
- + { "openbsd_link_spec", OBSD_LINK_SPEC }, \
- + { "openbsd_entry_point", OPENBSD_ENTRY_POINT },
- +
- +#define OPENBSD_ENTRY_POINT "__start"
- +
- +/* Pass -X to the linker so that it will strip symbols starting with 'L' */
- +#undef LINK_SPEC
- +#define LINK_SPEC \
- + "-X %{mbig-endian:-EB} %{mlittle-endian:-EL} \
- + %(openbsd_link_spec)"
- +
- +/* Make GCC agree with <machine/_types.h>. */
- +
- +#undef SIZE_TYPE
- +#define SIZE_TYPE "long unsigned int"
- +
- +#undef PTRDIFF_TYPE
- +#define PTRDIFF_TYPE "long int"
- +
- +#undef INTMAX_TYPE
- +#define INTMAX_TYPE "long long int"
- +
- +#undef UINTMAX_TYPE
- +#define UINTMAX_TYPE "long long unsigned int"
- +
- +#undef WCHAR_TYPE
- +#define WCHAR_TYPE "int"
- +
- +#undef WCHAR_TYPE_SIZE
- +#define WCHAR_TYPE_SIZE 32
- +
- +/* We don't have any limit on the length as out debugger is GDB. */
- +#undef DBX_CONTIN_LENGTH
- +
- +/* OpenBSD and NetBSD do their 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) \
- +{ \
- + asm_fprintf (STREAM, "\tmov\t%Rip, %Rlr\n"); \
- + asm_fprintf (STREAM, "\tbl\t__mcount%s\n", \
- + NEED_PLT_RELOC ? "(PLT)" : ""); \
- +}
- +
- +/* On the ARM `@' introduces a comment, so we must use something else
- + for .type directives. */
- +#undef TYPE_OPERAND_FMT
- +#define TYPE_OPERAND_FMT "%%%s"
- +
- +#undef FPUTYPE_DEFAULT
- +#define FPUTYPE_DEFAULT "vfp"
- +
- +/* VERY BIG NOTE: Change of structure alignment for OpenBSD|NetBSD/arm.
- + 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 OpenBSD|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
- + OpenBSD|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
- + OpenBSD|NetBSD source tree it is currently the only solution that meets the
- + requirements. */
- +
- +#undef DEFAULT_STRUCTURE_SIZE_BOUNDARY
- +#define DEFAULT_STRUCTURE_SIZE_BOUNDARY 8
- +
- +/* Clear the instruction cache from `BEG' to `END'. This makes a
- + call to the ARM_SYNC_ICACHE architecture specific syscall. */
- +#define CLEAR_INSN_CACHE(BEG, END) \
- +do \
- + { \
- + extern int sysarch(int number, void *args); \
- + struct { \
- + unsigned int addr; \
- + int len; \
- + } s; \
- + s.addr = (unsigned int)(BEG); \
- + s.len = (END) - (BEG); \
- + (void) sysarch (0, &s); \
- + } \
- +while (0)
- +
- +/* Provide a STARTFILE_SPEC appropriate for OpenBSD ELF. Here we
- + provide support for the special GCC option -static. On ELF
- + targets, we also add the crtbegin.o file, which provides part
- + of the support for getting C++ file-scope static objects
- + constructed before entering "main". */
- +
- +#define OPENBSD_STARTFILE_SPEC \
- + "%{!shared: \
- + %{pg:gcrt0%O%s} \
- + %{!pg: \
- + %{p:gcrt0%O%s} \
- + %{!p:%{!static:crt0%O%s} %{static:%{nopie:crt0%O%s} \
- + %{!nopie:rcrt0%O%s}}}}} \
- + %:if-exists(crti%O%s) \
- + %{static:%:if-exists-else(crtbeginT%O%s crtbegin%O%s)} \
- + %{!static: \
- + %{!shared:crtbegin%O%s} %{shared:crtbeginS%O%s}}"
- +
- +#undef STARTFILE_SPEC
- +#define STARTFILE_SPEC OPENBSD_STARTFILE_SPEC
- +
- +/* Provide an ENDFILE_SPEC appropriate for OpenBSD ELF. Here we
- +add crtend.o, which provides part of the support for getting
- +C++ file-scope static objects deconstructed after exiting "main". */
- +
- +#define OPENBSD_ENDFILE_SPEC \
- + "%{!shared:crtend%O%s} %{shared:crtendS%O%s} \
- + %:if-exists(crtn%O%s)"
- +
- +#undef ENDFILE_SPEC
- +#define ENDFILE_SPEC OPENBSD_ENDFILE_SPEC
- +
- +/* Remove -mcpu=native handling which is Linux specific */
- +#undef DRIVER_SELF_SPECS
- +#define DRIVER_SELF_SPECS ""
- +
- +/* dito */
- +#undef EXTRA_SPEC_FUNCTIONS
- +
- +#define SUBTARGET_OVERRIDE_INTERNAL_OPTIONS \
- +do { \
- + if (opts_set->x_unaligned_access == 1) \
- + warning (0, "target OS does not support unaligned accesses"); \
- + if (opts->x_unaligned_access) \
- + opts->x_unaligned_access = 0; \
- +} while (0)
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