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area in uw_frame_state_for
The following patch implements something that has Florian found as
low hanging fruit in our unwinder and has been discussed in the
https://gcc.gnu.org/wiki/cauldron2022#cauldron2022talks.inprocess_unwinding_bof
talk.
_Unwind_FrameState type seems to be (unlike the pre-GCC 3 frame_state
which has been part of ABI) private to unwind-dw2.c + unwind.inc it
includes, it is always defined on the stack of some entrypoints, initialized
by static uw_frame_state_for and the address of it is also passed to other
static functions or the static inlines handling machine dependent unwinding,
but it isn't fortunately passed to any callbacks or public functions, so I
think we can safely change it any time we want.
Florian mentioned that the structure is large even on x86_64, 384 bytes
there, starts with 328 bytes long element with frame_state_reg_info type
which then starts with an array with __LIBGCC_DWARF_FRAME_REGISTERS__ + 1
elements, each of them is 16 bytes long, on x86_64
__LIBGCC_DWARF_FRAME_REGISTERS__ is just 17 but even that is big, on say
riscv __LIBGCC_DWARF_FRAME_REGISTERS__ is I think 128, on powerpc 111,
on sh 153 etc. And, we memset to zero the whole fs variable with the
_Unwind_FrameState type at the start of the unwinding.
The reason why each element is 16 byte (on 64-bit arches) is that it
contains some pointer or pointer sized integer and then an enum (with just
7 different enumerators) + padding.
The following patch decreases it by moving the enum into a separate
array and using just one byte for each register in that second array.
We could compress it even more, say 4 bits per register, but I don't
want to uglify the code for it too much and make the accesses slower.
Furthermore, the clearing of the object can clear only thos how array
and members after it, because REG_UNSAVED enumerator (0) doesn't actually
need any pointer or pointer sized integer, it is just the other kinds
that need to have there something.
By doing this, on x86_64 the above numbers change to _Unwind_FrameState
type being now 264 bytes long, frame_state_reg_info 208 bytes and we
don't clear the first 144 bytes of the object, so the memset is 120 bytes,
so ~ 31% of the old clearing size. On riscv 64-bit assuming it has same
structure layout rules for the few types used there that would be
~ 2160 bytes of _Unwind_FrameState type before and ~ 1264 bytes after,
with the memset previously ~ 2160 bytes and after ~ 232 bytes after.
We've also talked about possibly adding a number of initially initialized
regs and initializing the rest lazily, but at least for x86_64 with
18 elements in the array that doesn't seem to be worth it anymore,
especially because return address column is 16 there and that is usually the
first thing to be touched. It might theory help with lots of registers if
they are usually untouched, but would uglify and complicate any stores to
how by having to check there for the not initialized yet cases and lazy
initialization, and similarly for all reads of how to do there if below
last initialized one, use how, otherwise imply REG_UNSAVED.
The disadvantage of the patch is that touching reg[x].loc and how[x]
now means 2 cachelines rather than one as before, and I admit beyond
bootstrap/regtest I haven't benchmarked it in any way.
2022-10-06 Jakub Jelinek <jakub@redhat.com>
* unwind-dw2.h (REG_UNSAVED, REG_SAVED_OFFSET, REG_SAVED_REG,
REG_SAVED_EXP, REG_SAVED_VAL_OFFSET, REG_SAVED_VAL_EXP,
REG_UNDEFINED): New anonymous enum, moved from inside of
struct frame_state_reg_info.
(struct frame_state_reg_info): Remove reg[].how element and the
anonymous enum there. Add how element.
* unwind-dw2.c: Include stddef.h.
(uw_frame_state_for): Don't clear first
offsetof (_Unwind_FrameState, regs.how[0]) bytes of *fs.
(execute_cfa_program, __frame_state_for, uw_update_context_1,
uw_update_context): Use fs->regs.how[X] instead of fs->regs.reg[X].how
or fs.regs.how[X] instead of fs.regs.reg[X].how.
* config/sh/linux-unwind.h (sh_fallback_frame_state): Likewise.
* config/bfin/linux-unwind.h (bfin_fallback_frame_state): Likewise.
* config/pa/linux-unwind.h (pa32_fallback_frame_state): Likewise.
* config/pa/hpux-unwind.h (UPDATE_FS_FOR_SAR, UPDATE_FS_FOR_GR,
UPDATE_FS_FOR_FR, UPDATE_FS_FOR_PC, pa_fallback_frame_state):
Likewise.
* config/alpha/vms-unwind.h (alpha_vms_fallback_frame_state):
Likewise.
* config/alpha/linux-unwind.h (alpha_fallback_frame_state): Likewise.
* config/arc/linux-unwind.h (arc_fallback_frame_state,
arc_frob_update_context): Likewise.
* config/riscv/linux-unwind.h (riscv_fallback_frame_state): Likewise.
* config/nios2/linux-unwind.h (NIOS2_REG): Likewise.
* config/nds32/linux-unwind.h (NDS32_PUT_FS_REG): Likewise.
* config/s390/tpf-unwind.h (s390_fallback_frame_state): Likewise.
* config/s390/linux-unwind.h (s390_fallback_frame_state): Likewise.
* config/sparc/sol2-unwind.h (sparc64_frob_update_context,
MD_FALLBACK_FRAME_STATE_FOR): Likewise.
* config/sparc/linux-unwind.h (sparc64_fallback_frame_state,
sparc64_frob_update_context, sparc_fallback_frame_state): Likewise.
* config/i386/sol2-unwind.h (x86_64_fallback_frame_state,
x86_fallback_frame_state): Likewise.
* config/i386/w32-unwind.h (i386_w32_fallback_frame_state): Likewise.
* config/i386/linux-unwind.h (x86_64_fallback_frame_state,
x86_fallback_frame_state): Likewise.
* config/i386/freebsd-unwind.h (x86_64_freebsd_fallback_frame_state):
Likewise.
* config/i386/dragonfly-unwind.h
(x86_64_dragonfly_fallback_frame_state): Likewise.
* config/i386/gnu-unwind.h (x86_gnu_fallback_frame_state): Likewise.
* config/csky/linux-unwind.h (csky_fallback_frame_state): Likewise.
* config/aarch64/linux-unwind.h (aarch64_fallback_frame_state):
Likewise.
* config/aarch64/freebsd-unwind.h
(aarch64_freebsd_fallback_frame_state): Likewise.
* config/aarch64/aarch64-unwind.h (aarch64_frob_update_context):
Likewise.
* config/or1k/linux-unwind.h (or1k_fallback_frame_state): Likewise.
* config/mips/linux-unwind.h (mips_fallback_frame_state): Likewise.
* config/loongarch/linux-unwind.h (loongarch_fallback_frame_state):
Likewise.
* config/m68k/linux-unwind.h (m68k_fallback_frame_state): Likewise.
* config/xtensa/linux-unwind.h (xtensa_fallback_frame_state):
Likewise.
* config/rs6000/darwin-fallback.c (set_offset): Likewise.
* config/rs6000/aix-unwind.h (MD_FROB_UPDATE_CONTEXT): Likewise.
* config/rs6000/linux-unwind.h (ppc_fallback_frame_state): Likewise.
* config/rs6000/freebsd-unwind.h (frob_update_context): Likewise.
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From-SVN: r279813
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From-SVN: r267494
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From-SVN: r256169
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From-SVN: r243994
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From-SVN: r232055
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From-SVN: r219188
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gcc/c-family:
* c-cppbuiltin.c (c_cpp_builtins): Also define
__LIBGCC_EH_TABLES_CAN_BE_READ_ONLY__,
__LIBGCC_EH_FRAME_SECTION_NAME__, __LIBGCC_JCR_SECTION_NAME__,
__LIBGCC_CTORS_SECTION_ASM_OP__, __LIBGCC_DTORS_SECTION_ASM_OP__,
__LIBGCC_TEXT_SECTION_ASM_OP__, __LIBGCC_INIT_SECTION_ASM_OP__,
__LIBGCC_INIT_ARRAY_SECTION_ASM_OP__,
__LIBGCC_STACK_GROWS_DOWNWARD__,
__LIBGCC_DONT_USE_BUILTIN_SETJMP__,
__LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__,
__LIBGCC_DWARF_FRAME_REGISTERS__,
__LIBGCC_EH_RETURN_STACKADJ_RTX__, __LIBGCC_JMP_BUF_SIZE__,
__LIBGCC_STACK_POINTER_REGNUM__ and
__LIBGCC_VTABLE_USES_DESCRIPTORS__ for -fbuilding-libgcc.
(builtin_define_with_value): Handle backslash-escaping in string
macro values.
libgcc:
* Makefile.in (CRTSTUFF_CFLAGS): Add -fbuilding-libgcc.
* config/aarch64/linux-unwind.h (STACK_POINTER_REGNUM): Change all
uses to __LIBGCC_STACK_POINTER_REGNUM__.
(DWARF_ALT_FRAME_RETURN_COLUMN): Change all uses to
__LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__.
* config/alpha/vms-unwind.h (DWARF_ALT_FRAME_RETURN_COLUMN):
Change use to __LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__.
* config/cr16/unwind-cr16.c (STACK_GROWS_DOWNWARD): Change all
uses to __LIBGCC_STACK_GROWS_DOWNWARD__.
(DWARF_FRAME_REGISTERS): Change all uses to
__LIBGCC_DWARF_FRAME_REGISTERS__.
(EH_RETURN_STACKADJ_RTX): Change all uses to
__LIBGCC_EH_RETURN_STACKADJ_RTX__.
* config/cr16/unwind-dw2.h (DWARF_FRAME_REGISTERS): Change use to
__LIBGCC_DWARF_FRAME_REGISTERS__. Remove conditional definition.
* config/i386/cygming-crtbegin.c (EH_FRAME_SECTION_NAME): Change
use to __LIBGCC_EH_FRAME_SECTION_NAME__.
(JCR_SECTION_NAME): Change use to __LIBGCC_JCR_SECTION_NAME__.
* config/i386/cygming-crtend.c (EH_FRAME_SECTION_NAME): Change use
to __LIBGCC_EH_FRAME_SECTION_NAME__.
(JCR_SECTION_NAME): Change use to __LIBGCC_JCR_SECTION_NAME__
* config/mips/linux-unwind.h (STACK_POINTER_REGNUM): Change use to
__LIBGCC_STACK_POINTER_REGNUM__.
(DWARF_ALT_FRAME_RETURN_COLUMN): Change all uses to
__LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__.
* config/nios2/linux-unwind.h (STACK_POINTER_REGNUM): Change use
to __LIBGCC_STACK_POINTER_REGNUM__.
* config/pa/hpux-unwind.h (DWARF_ALT_FRAME_RETURN_COLUMN): Change
all uses to __LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__.
* config/pa/linux-unwind.h (DWARF_ALT_FRAME_RETURN_COLUMN): Change
all uses to __LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__.
* config/rs6000/aix-unwind.h (DWARF_ALT_FRAME_RETURN_COLUMN):
Change all uses to __LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__.
(STACK_POINTER_REGNUM): Change all uses to
__LIBGCC_STACK_POINTER_REGNUM__.
* config/rs6000/darwin-fallback.c (STACK_POINTER_REGNUM): Change
use to __LIBGCC_STACK_POINTER_REGNUM__.
* config/rs6000/linux-unwind.h (STACK_POINTER_REGNUM): Change all
uses to __LIBGCC_STACK_POINTER_REGNUM__.
* config/sparc/linux-unwind.h (DWARF_FRAME_REGISTERS): Change use
to __LIBGCC_DWARF_FRAME_REGISTERS__.
* config/sparc/sol2-unwind.h (DWARF_FRAME_REGISTERS): Change use
to __LIBGCC_DWARF_FRAME_REGISTERS__.
* config/tilepro/linux-unwind.h (STACK_POINTER_REGNUM): Change use
to __LIBGCC_STACK_POINTER_REGNUM__.
* config/xtensa/unwind-dw2-xtensa.h (DWARF_FRAME_REGISTERS):
Remove conditional definition.
* crtstuff.c (TEXT_SECTION_ASM_OP): Change all uses to
__LIBGCC_TEXT_SECTION_ASM_OP__.
(EH_FRAME_SECTION_NAME): Change all uses to
__LIBGCC_EH_FRAME_SECTION_NAME__.
(EH_TABLES_CAN_BE_READ_ONLY): Change all uses to
__LIBGCC_EH_TABLES_CAN_BE_READ_ONLY__.
(CTORS_SECTION_ASM_OP): Change all uses to
__LIBGCC_CTORS_SECTION_ASM_OP__.
(DTORS_SECTION_ASM_OP): Change all uses to
__LIBGCC_DTORS_SECTION_ASM_OP__.
(JCR_SECTION_NAME): Change all uses to
__LIBGCC_JCR_SECTION_NAME__.
(INIT_SECTION_ASM_OP): Change all uses to
__LIBGCC_INIT_SECTION_ASM_OP__.
(INIT_ARRAY_SECTION_ASM_OP): Change all uses to
__LIBGCC_INIT_ARRAY_SECTION_ASM_OP__.
* generic-morestack.c (STACK_GROWS_DOWNWARD): Change all uses to
__LIBGCC_STACK_GROWS_DOWNWARD__.
* libgcc2.c (INIT_SECTION_ASM_OP): Change all uses to
__LIBGCC_INIT_SECTION_ASM_OP__.
(INIT_ARRAY_SECTION_ASM_OP): Change all uses to
__LIBGCC_INIT_ARRAY_SECTION_ASM_OP__.
(EH_FRAME_SECTION_NAME): Change all uses to
__LIBGCC_EH_FRAME_SECTION_NAME__.
* libgcov-profiler.c (VTABLE_USES_DESCRIPTORS): Remove conditional
definitions. Change all uses to
__LIBGCC_VTABLE_USES_DESCRIPTORS__.
* unwind-dw2.c (STACK_GROWS_DOWNWARD): Change all uses to
__LIBGCC_STACK_GROWS_DOWNWARD__.
(DWARF_FRAME_REGISTERS): Change all uses to
__LIBGCC_DWARF_FRAME_REGISTERS__.
(EH_RETURN_STACKADJ_RTX): Change all uses to
__LIBGCC_EH_RETURN_STACKADJ_RTX__.
* unwind-dw2.h (DWARF_FRAME_REGISTERS): Remove conditional
definition. Change use to __LIBGCC_DWARF_FRAME_REGISTERS__.
* unwind-sjlj.c (DONT_USE_BUILTIN_SETJMP): Change all uses to
__LIBGCC_DONT_USE_BUILTIN_SETJMP__.
(JMP_BUF_SIZE): Change use to __LIBGCC_JMP_BUF_SIZE__.
From-SVN: r214954
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From-SVN: r206295
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From-SVN: r195731
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gcc/
* doc/invoke.texi (SPARC options): Add -mflat.
* config/sparc/sparc.opt: Likewise.
* config/sparc/sparc-protos.h (sparc_expand_epilogue): Add parameter.
(sparc_flat_expand_prologue): Declare.
(sparc_flat_expand_epilogue): Likewise.
* config/sparc/sparc.h (CPP_CPU_SPEC): Do not handle -msoft-float.
(CPP_ENDIAN_SPEC): Replace with...
(CPP_OTHER_SPEC): ...this. Also handle -mflat and -msoft-float.
(CPP_SPEC): Adjust to above change.
(EXTRA_SPECS): Likewise.
(SPARC_INCOMING_INT_ARG_FIRST): Add TARGET_FLAT handling.
(INCOMING_REGNO): Likewise.
(OUTGOING_REGNO): Likewise.
(LOCAL_REGNO): Likewise.
(SETUP_FRAME_ADDRESSES): Likewise.
(FIXED_REGISTERS): Set 0 for %fp.
(CALL_USED_REGISTERS): Likewise.
(INITIAL_ELIMINATION_OFFSET): Pass current_function_is_leaf.
(EXIT_IGNORE_STACK): Define to 1 unconditionally.
(RETURN_ADDR_REGNUM): Define.
(RETURN_ADDR_RTX): Use it.
(INCOMING_RETURN_ADDR_REGNUM): Define.
(INCOMING_RETURN_ADDR_RTX): Use it.
(DWARF_FRAME_RETURN_COLUMN): Likewise.
(EH_RETURN_REGNUM): Define.
(EH_RETURN_STACKADJ_RTX): Use it.
(EH_RETURN_HANDLER_RTX): Delete.
(EPILOGUE_USES): Use them and add TARGET_FLAT handling.
* config/sparc/sparc.c (apparent_fsize, actual_fsize, num_gfregs):
Delete.
(struct machine_function): Add frame_size, apparent_frame_size,
frame_base_reg, frame_base_offset, n_global_fp_regs and
save_local_in_regs_p fields.
(sparc_frame_size, sparc_apparent_frame_size, sparc_frame_base_reg,
sparc_frame_base_offset, sparc_n_global_fp_regs,
sparc_save_local_in_regs_p): New macros.
(sparc_option_override): Error out if -fcall-saved-REG is specified
for Out registers.
(eligible_for_restore_insn): Fix formatting.
(eligible_for_return_delay): Likewise. Add TARGET_FLAT handling.
(eligible_for_sibcall_delay): Likewise.
(RTX_OK_FOR_OFFSET_P, RTX_OK_FOR_OLO10_P): Add MODE parameter.
(sparc_legitimate_address_p): Adjust to above change.
(save_global_or_fp_reg_p): New predicate.
(return_addr_reg_needed_p): Likewise.
(save_local_or_in_reg_p): Likewise.
(sparc_compute_frame_size): Use them. Add TARGET_FLAT handling.
(SORR_SAVE, SORR_RESTORE): Delete.
(sorr_pred_t): New typedef.
(sorr_act_t): New enum.
(save_or_restore_regs): Rename to...
(emit_save_or_restore_regs): ...this. Change type of LOW and HIGH
parameters, remove ACTION parameter, add LEAF_FUNCTION_P, SAVE_P,
ACTION_TRUE and ACTION_FALSE parameters. Implement more general
mechanism. Add CFI information for double-word saves in 32-bit mode.
(emit_adjust_base_to_offset): New function extracted from...
(emit_save_or_restore_regs): ...this. Rename the rest to...
(emit_save_or_restore_regs_global_fp_regs): ...this.
(emit_save_or_restore_regs_local_in_regs): New function.
(gen_create_flat_frame_[123]): New functions.
(sparc_expand_prologue): Use SIZE local variable. Adjust.
(sparc_flat_expand_prologue): New function.
(sparc_asm_function_prologue): Add TARGET_FLAT handling.
(sparc_expand_epilogue): Use SIZE local variable. Adjust.
(sparc_flat_expand_epilogue): New function.
(sparc_can_use_return_insn_p): Add TARGET_FLAT handling.
(output_return): Likewise.
(output_sibcall): Likewise.
(sparc_output_mi_thunk): Likewise.
(sparc_frame_pointer_required): Likewise.
(sparc_conditional_register_usage): If TARGET_FLAT, disable the leaf
function optimization.
* config/sparc/sparc.md (flat): New attribute.
(prologue): Add TARGET_FLAT handling.
(save_register_window): Disable if TARGET_FLAT.
(create_flat_frame_[123]): New patterns.
(epilogue): Add TARGET_FLAT handling.
(sibcall_epilogue): Likewise.
(eh_return): New expander.
(eh_return_internal): New insn and splitter.
(return_internal): Add TARGET_FLAT handling.
(untyped_return): Remove bogus test and use RETURN_ADDR_REGNUM.
(save_stack_nonlocal): Use RETURN_ADDR_REGNUM.
(nonlocal_goto): Add TARGET_FLAT handling.
* config/sparc/t-elf: Add -mflat multilib.
* config/sparc/t-leon: Likewise.
libgcc/
* config/sparc/linux-unwind.h (STACK_BIAS): Define.
(sparc64_fallback_frame_state): Use it.
(sparc64_frob_update_context): Further adjust context.
* config/sparc/sol2-unwind.h (sparc64_frob_update_context): Likewise.
* config/sparc/sol2-ci.S: Add TARGET_FLAT handling.
* config/sparc/sol2-cn.S: Likewise.
Co-Authored-By: Laurent Rougé <laurent.rouge@menta.fr>
From-SVN: r174897
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gcc:
* config/alpha/linux.h (MD_UNWIND_SUPPORT): Remove.
* config/alpha/osf5.h (MD_UNWIND_SUPPORT): Remove.
* config/alpha/vms.h (MD_UNWIND_SUPPORT): Remove.
* config/bfin/linux.h (MD_UNWIND_SUPPORT): Remove.
* config/bfin/uclinux.h (MD_UNWIND_SUPPORT): Remove.
* config/i386/linux.h (MD_UNWIND_SUPPORT): Remove.
* config/i386/linux64.h (MD_UNWIND_SUPPORT): Remove.
* config/i386/sol2.h (MD_UNWIND_SUPPORT): Remove.
* config/i386/mingw32.h (MD_UNWIND_SUPPORT): Remove.
* config/ia64/linux.h (MD_UNWIND_SUPPORT): Remove.
* config/ia64/vms.h (MD_UNWIND_SUPPORT): Remove.
* config/m68k/linux.h (MD_UNWIND_SUPPORT): Remove.
* config/mips/linux.h (MD_UNWIND_SUPPORT): Remove.
* config/pa/pa-hpux.h (MD_UNWIND_SUPPORT): Remove.
* config/pa/pa32-linux.h (MD_UNWIND_SUPPORT): Remove.
* config/rs6000/darwin.h (MD_UNWIND_SUPPORT): Remove.
* config/rs6000/linux.h (MD_UNWIND_SUPPORT): Remove.
* config/rs6000/linux64.h (MD_UNWIND_SUPPORT): Remove.
* config/s390/linux.h (MD_UNWIND_SUPPORT): Remove.
* config/s390/tpf.h (MD_UNWIND_SUPPORT): Remove.
* config/sh/linux.h (MD_UNWIND_SUPPORT): Remove.
* config/sparc/linux.h (MD_UNWIND_SUPPORT): Remove.
* config/sparc/linux64.h (MD_UNWIND_SUPPORT): Remove.
* config/sparc/sol2.h (MD_UNWIND_SUPPORT): Remove.
* config/xtensa/linux.h (MD_UNWIND_SUPPORT): Remove.
* config/alpha/linux-unwind.h: Move to ../libgcc/config/alpha.
* config/alpha/osf5-unwind.h: Move to ../libgcc/config/alpha.
* config/alpha/vms-unwind.h: Move to ../libgcc/config/alpha.
* config/bfin/linux-unwind.h: Move to ../libgcc/config/bfin.
* config/i386/linux-unwind.h: Move to ../libgcc/config/i386.
* config/i386/sol2-unwind.h: Move to ../libgcc/config/i386.
* config/i386/w32-unwind.h: Move to ../libgcc/config/i386.
* config/ia64/linux-unwind.h: Move to ../libgcc/config/ia64.
* config/ia64/vms-unwind.h: Move to ../libgcc/config/ia64.
* config/m68k/linux-unwind.h: Move to ../libgcc/config/m68k.
* config/mips/linux-unwind.h: Move to ../libgcc/config/mips.
* config/pa/hpux-unwind.h: Move to ../libgcc/config/pa.
* config/pa/linux-unwind.h: Move to ../libgcc/config/pa.
* config/rs6000/darwin-unwind.h: Move to ../libgcc/config/rs6000.
* config/rs6000/linux-unwind.h: Move to ../libgcc/config/rs6000.
* config/s390/linux-unwind.h: Move to ../libgcc/config/s390.
* config/s390/tpf-unwind.h: Move to ../libgcc/config/s390.
* config/sh/linux-unwind.h: Move to ../libgcc/config/sh.
* config/sparc/linux-unwind.h: Move to ../libgcc/config/sparc.
* config/sparc/sol2-unwind.h: Move to ../libgcc/config/sparc.
* config/xtensa/linux-unwind.h: Move to ../libgcc/config/xtensa.
* config/darwin9.h (DARWIN_LIBSYSTEM_HAS_UNWIND): Remove.
* system.h (MD_UNWIND_SUPPORT): Poison.
* doc/tm.texi.in (Exception Handling, MD_UNWIND_SUPPORT): Remove.
* doc/tm.texi: Regenerate.
* unwind-dw2.c: Include md-unwind-support.h instead of
MD_UNWIND_SUPPORT.
* config/ia64/unwind-ia64.c: Likewise.
* config/xtensa/unwind-dw2-xtensa.c: Likewise.
libgcc:
* config/alpha/linux-unwind.h: Move from ../gcc/config/alpha.
* config/alpha/osf5-unwind.h: Move from ../gcc/config/alpha.
* config/alpha/vms-unwind.h: Move from ../gcc/config/alpha.
* config/bfin/linux-unwind.h: Move from ../gcc/config/bfin.
* config/i386/linux-unwind.h: Move from ../gcc/config/i386.
* config/i386/sol2-unwind.h: Move from ../gcc/config/i386.
* config/i386/w32-unwind.h: Move from ../gcc/config/i386.
Wrap in !__MINGW64__.
* config/ia64/linux-unwind.h: Move from ../gcc/config/ia64.
* config/ia64/vms-unwind.h: Move from ../gcc/config/ia64.
* config/m68k/linux-unwind.h: Move from ../gcc/config/m68k.
* config/mips/linux-unwind.h: Move from ../gcc/config/mips.
* config/pa/hpux-unwind.h: Move from ../gcc/config/pa.
* config/pa/linux-unwind.h: Move from ../gcc/config/pa.
* config/rs6000/darwin-unwind.h: Move from ../gcc/config/rs6000.
Wrap in !__LP64__.
* config/rs6000/linux-unwind.h: Move from ../gcc/config/rs6000.
* config/s390/linux-unwind.h: Move from ../gcc/config/s390.
* config/s390/tpf-unwind.h: Move from ../gcc/config/s390.
* config/sh/linux-unwind.h: Move from ../gcc/config/sh.
* config/sparc/linux-unwind.h: Move from ../gcc/config/sparc.
* config/sparc/sol2-unwind.h: Move from ../gcc/config/sparc.
* config/xtensa/linux-unwind.h: Move from ../gcc/config/xtensa.
* config/no-unwind.h: New file.
* config.host (md_unwind_header): Document.
Define.
(alpha*-*-linux*, alpha*-dec-osf5.1*, alpha64-dec-*vms*,
alpha*-dec-*vms*, bfin*-uclinux*, bfin*-linux-uclibc*,
hppa*-*-linux*, hppa[12]*-*-hpux10*, hppa*64*-*-hpux11*,
hppa[12]*-*-hpux11*): Set md_unwind_header.
(i[34567]86-*-linux*): Handle i[34567]86-*-kopensolaris*-gnu.
Set md_unwind_header.
(x86_64-*-linux*, i[34567]86-*-solaris2*): Set md_unwind_header.
(i[34567]86-*-cygwin*): Split from i[34567]86-*-mingw*.
(i[34567]86-*-mingw*, ia64*-*-linux*, ia64-hp-*vms*,
m68k-*-uclinux*, m68k-*-linux*, mips64*-*-linux*, mips*-*-linux*,
powerpc-*-darwin*, powerpc-*-linux*, s390-*-linux*,
s390x-*-linux*, s390x-ibm-tpf*, sh*-*-linux*, sparc-*-linux*,
sparc*-*-solaris2*, sparc64-*-linux*, xtensa*-*-linux*): Set
md_unwind_header.
* configure.ac: Link md-unwind-support.h to $md_unwind_header.
* configure: Regenerate.
From-SVN: r174613
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