This patch provides a new handler MD_ARCH_FRAME_STATE_T to hide an
architecture-specific structure containing CIE and FDE data related
to DWARF architecture extensions.

Hiding the architecture-specific attributes behind a handler has the
following benefits:
1. isolating those data from the generic ones in _Unwind_FrameState
2. avoiding casts to custom types.
3. preserving typing information when debugging with GDB, and so
   facilitating their printing.

This approach required to add a new header md-unwind-def.h included at
the top of libgcc/unwind-dw2.h, and redirecting to the corresponding
architecture header via a symbolic link.

An obvious drawback is the increase in complexity with macros, and
headers. It also caused a split of architecture definitions between
md-unwind-def.h (types definitions used in unwind-dw2.h) and
md-unwind.h (local types definitions and handlers implementations).
The naming of md-unwind.h with .h extension is a bit misleading as
the file is only included in the middle of unwind-dw2.c. Changing
this naming would require modification of others backends, which I
prefered to abstain from. Overall the benefits are worth the added
complexity from my perspective.

libgcc/ChangeLog:

	* Makefile.in: New target for symbolic link to md-unwind-def.h
	* config.host: New parameter md_unwind_def_header. Set it to
	aarch64/aarch64-unwind-def.h for AArch64 targets, or no-unwind.h
	by default.
	* config/aarch64/aarch64-unwind.h
	(aarch64_pointer_auth_key): Move to aarch64-unwind-def.h
	(aarch64_cie_aug_handler): Update.
	(aarch64_arch_extension_frame_init): Update.
	(aarch64_demangle_return_addr): Update.
	* configure.ac: New substitute variable md_unwind_def_header.
	* unwind-dw2.h (defined): MD_ARCH_FRAME_STATE_T.
	* config/aarch64/aarch64-unwind-def.h: New file.
	* configure: Regenerate.
	* config/no-unwind.h: Updated comment

This patch is only a refactoring of the existing implementation
of PAuth and returned-address signing. The existing behavior is
preserved.

_Unwind_FrameState already contains several CIE and FDE information
(see the attributes below the comment "The information we care
about from the CIE/FDE" in libgcc/unwind-dw2.h).
The patch aims at moving the information from DWARF CIE (signing
key stored in the augmentation string) and FDE (the used signing
method) into _Unwind_FrameState along the already-stored CIE and
FDE information.
Note: those information have to be saved in frame_state_reg_info
instead of _Unwind_FrameState as they need to be savable by
DW_CFA_remember_state and restorable by DW_CFA_restore_state, that
both rely on the attribute "prev".

Those new information in _Unwind_FrameState simplifies the look-up
of the signing key when the return address is demangled. It also
allows future signing methods to be easily added.

_Unwind_FrameState is not a part of the public API of libunwind,
so the change is backward compatible.

A new architecture-specific handler MD_ARCH_EXTENSION_FRAME_INIT
allows to reset values (if needed) in the frame state and unwind
context before changing the frame state to the caller context.

A new architecture-specific handler MD_ARCH_EXTENSION_CIE_AUG_HANDLER
isolates the architecture-specific augmentation strings in AArch64
backend, and allows others architectures to reuse augmentation
strings that would have clashed with AArch64 DWARF extensions.

aarch64_demangle_return_addr, DW_CFA_AARCH64_negate_ra_state and
DW_CFA_val_expression cases in libgcc/unwind-dw2-execute_cfa.h
were documented to clarify where the value of the RA state register
is stored (FS and CONTEXT respectively).

libgcc/ChangeLog:

	* config/aarch64/aarch64-unwind.h
	(AARCH64_DWARF_RA_STATE_MASK): The mask for RA state register.
	(aarch64_ra_signing_method_t): The diversifiers used to sign a
	function's return address.
	(aarch64_pointer_auth_key): The key used to sign a function's
	return address.
	(aarch64_cie_signed_with_b_key): Deleted as the signing key is
	available now in _Unwind_FrameState.
	(MD_ARCH_EXTENSION_CIE_AUG_HANDLER): New CIE augmentation string
	handler for architecture extensions.
	(MD_ARCH_EXTENSION_FRAME_INIT): New architecture-extension
	initialization routine for DWARF frame state and context before
	execution of DWARF instructions.
	(aarch64_context_ra_state_get): Read RA state register from CONTEXT.
	(aarch64_ra_state_get): Read RA state register from FS.
	(aarch64_ra_state_set): Write RA state register into FS.
	(aarch64_ra_state_toggle): Toggle RA state register in FS.
	(aarch64_cie_aug_handler): Handler AArch64 augmentation strings.
	(aarch64_arch_extension_frame_init): Initialize defaults for the
	signing key (PAUTH_KEY_A), and RA state register (RA_no_signing).
	(aarch64_demangle_return_addr): Rely on the frame registers and
	the signing_key attribute in _Unwind_FrameState.
	* unwind-dw2-execute_cfa.h:
	Use the right alias DW_CFA_AARCH64_negate_ra_state for __aarch64__
	instead of DW_CFA_GNU_window_save.
	(DW_CFA_AARCH64_negate_ra_state): Save the signing method in RA
	state register. Toggle RA state register without resetting 'how'
	to REG_UNSAVED.
	* unwind-dw2.c:
	(extract_cie_info): Save the signing key in the current
	_Unwind_FrameState while parsing the augmentation data.
	(uw_frame_state_for): Reset some attributes related to architecture
	extensions in _Unwind_FrameState.
	(uw_update_context): Move authentication code to AArch64 unwinding.
	* unwind-dw2.h (enum register_rule): Give a name to the existing
	enum for the register rules, and replace 'unsigned char' by 'enum
	register_rule' to facilitate debugging in GDB.
	(_Unwind_FrameState): Add a new architecture-extension attribute
	to store the signing key.

A recent change only initializes the regs.how[] during Dwarf unwinding
which resulted in an uninitialized offset used in return address signing
and random failures during unwinding.  The fix is to encode the return
address signing state in REG_UNSAVED and a new state REG_UNSAVED_ARCHEXT.

libgcc/
	PR target/107678
	* unwind-dw2.h (REG_UNSAVED_ARCHEXT): Add new enum.
	* unwind-dw2.c (uw_update_context_1): Add REG_UNSAVED_ARCHEXT case.
	* unwind-dw2-execute_cfa.h: Use REG_UNSAVED_ARCHEXT/REG_UNSAVED to
	encode the return address signing state.
	* config/aarch64/aarch64-unwind.h (aarch64_demangle_return_addr)
	Check current return address signing state.
	(aarch64_frob_update_contex): Remove.

On many architectures, there is a padding gap after the how array
member, and cfa_how can be moved there.  This reduces the size of the
struct and the amount of memory that uw_frame_state_for has to clear.

There is no measurable performance benefit from this on x86-64 (even
though the memset goes from 120 to 112 bytes), but it seems to be a
good idea to do anyway.

libgcc/

	* unwind-dw2.h (struct frame_state_reg_info): Move cfa_how member
	and reduce its size.

libgcc: Decrease size of _Unwind_FrameState and even more size of cleared 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.

From-SVN: r279813

From-SVN: r267494

From-SVN: r256169

From-SVN: r243994

From-SVN: r232055

From-SVN: r219188

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

From-SVN: r206295

From-SVN: r195731

	gcc:
	* Makefile.in (UNWIND_H): Remove.
	(LIB2ADDEH, LIB2ADDEHSTATIC, LIB2ADDEHSHARED): Move to
	../libgcc/Makefile.in.
	(LIBUNWIND, SHLIBUNWIND_LINK, SHLIBUNWIND_INSTALL): Likewise.
	(LIBUNWINDDEP): Remove.
	(libgcc-support): Remove LIB2ADDEH, $(srcdir)/emutls.c dependencies.
	(libgcc.mvars): Remove LIB2ADDEH, LIB2ADDEHSTATIC, LIB2ADDEHSHARED,
	LIBUNWIND, SHLIBUNWIND_LINK, SHLIBUNWIND_INSTALL.
	(stmp-int-hdrs): Remove $(UNWIND_H) dependency.
	Don't copy $(UNWIND_H).
	* config.gcc (ia64*-*-linux*): Remove with_system_libunwind
	handling.
	* configure.ac (GCC_CHECK_UNWIND_GETIPINFO): Remove.
	* aclocal.m4: Regenerate.
	* configure: Regenerate.
	* emutls.c, unwind-c.c, unwind-compat.c, unwind-compat.h,
	unwind-dw2-fde-compat.c, unwind-dw2-fde-glibc.c, unwind-dw2-fde.c,
	unwind-dw2-fde.h, unwind-dw2.c, unwind-dw2.h, unwind-generic.h,
	unwind-pe.h, unwind-sjlj.c, unwind.inc: Move to ../libgcc.
	* unwind-dw2-fde-darwin.c: Move to ../libgcc/config.
	* config/arm/libunwind.S, config/arm/pr-support.c,
	config/arm/unwind-arm.c, config/arm/unwind-arm.h: Move to
	../libgcc/config/arm.
	* config/arm/t-bpabi (UNWIND_H, LIB2ADDEH): Remove.
	* config/arm/t-symbian (UNWIND_H, LIB2ADDEH): Remove.
	* config/frv/t-frv ($(T)frvbegin$(objext)): Use
	$(srcdir)/../libgcc to refer to unwind-dw2-fde.h.
	($(T)frvend$(objext)): Likewise.
	* config/ia64/t-glibc (LIB2ADDEH): Remove.
	* config/ia64/t-glibc-libunwind: Move to ../libgcc/config/ia64.
	* config/ia64/fde-glibc.c, config/ia64/fde-vms.c,
	config/ia64/unwind-ia64.c, config/ia64/unwind-ia64.h: Move to
	../libgcc/config/ia64.
	* config/ia64/t-hpux (LIB2ADDEH): Remove.
	* config/ia64/t-ia64 (LIB2ADDEH): Remove.
	* config/ia64/t-vms (LIB2ADDEH): Remove.
	* config/ia64/vms.h (UNW_IVMS_MODE,
	MD_UNW_COMPATIBLE_PERSONALITY_P): Remove.
	* config/picochip/t-picochip (LIB2ADDEH): Remove.
	* config/rs6000/aix.h (R_LR, MD_FROB_UPDATE_CONTEXT): Remove.
	* config/rs6000/t-darwin (LIB2ADDEH): Remove.
	* config/rs6000/darwin-fallback.c: Move to ../libgcc/config/rs6000.
	* config/sh/t-sh ($(T)unwind-dw2-Os-4-200.o): Use
	$(srcdir)/../libgcc to refer to unwinder sources.
	* config/spu/t-spu-elf (LIB2ADDEH): Remove.
	* config/t-darwin (LIB2ADDEH): Remove.
	* config/t-freebsd (LIB2ADDEH): Remove.
	* config/t-libunwind (LIB2ADDEH, LIB2ADDEHSTATIC): Remove.
	* config/t-libunwind-elf: Move to ../libgcc/config.
	* config/t-linux (LIB2ADDEH): Remove.
	* config/t-sol2 (LIB2ADDEH): Remove.
	* config/xtensa/t-xtensa (LIB2ADDEH): Remove.
	* system.h (MD_FROB_UPDATE_CONTEXT): Poison.

	gcc/po:
	* EXCLUDES (unwind-c.c, unwind-dw2-fde-darwin.c)
	(unwind-dw2-fde-glibc.c, unwind-dw2-fde.c, unwind-dw2-fde.h)
	(unwind-dw2.c, unwind-pe.h, unwind-sjlj.c, unwind.h): Remove.

	libgcc:
	* Makefile.in (LIB2ADDEH, LIB2ADDEHSTATIC, LIB2ADDEHSHARED): New
	variables.
	(LIBUNWIND, SHLIBUNWIND_LINK, SHLIBUNWIND_INSTALL): New variables.
	(LIB2ADDEH, LIB2ADDEHSTATIC, LIB2ADDEHSHARED): Add $(srcdir)/emutls.c.
	(install-unwind_h): New target.
	(all): Depend on it.
	* config.host (unwind_header): New variable.
	(*-*-freebsd*): Set tmake_file to t-eh-dw2-dip.
	(*-*-linux*, frv-*-*linux*, *-*-kfreebsd*-gnu, *-*-knetbsd*-gnu,
	*-*-gnu*): Likewise, also for *-*-kopensolaris*-gnu.
	(*-*-solaris2*): Add t-eh-dw2-dip to tmake_file.
	(arm*-*-linux*): Add arm/t-bpabi for arm*-*-linux-*eabi.
	Set unwind_header.
	(arm*-*-uclinux*): Add arm/t-bpabi for arm*-*-uclinux*eabi.
	Set unwind_header.
	(arm*-*-eabi*, arm*-*-symbianelf*): Add arm/t-bpabi for
	arm*-*-eabi*.
	Add arm/t-symbian to tmake_file for arm*-*-symbianelf*.
	Set unwind_header.
	(ia64*-*-elf*): Add ia64/t-eh-ia64 to tmake_file.
	(ia64*-*-freebsd*): Likewise.
	(ia64*-*-linux*): Add ia64/t-glibc, ia64/t-eh-ia64, t-libunwind to
	tmake_file.
	Add t-libunwind-elf, ia64/t-glibc-libunwind unless
	$with_system_libunwind.
	(ia64*-*-hpux*): Set tmake_file.
	(ia64-hp-*vms*): Add ia64/t-eh-ia64 to tmake_file.
	(picochip-*-*): Set tmake_file.
	(rs6000-ibm-aix4.[3456789]*, powerpc-ibm-aix4.[3456789]*): Set
	md_unwind_header.
	(rs6000-ibm-aix5.1.*, powerpc-ibm-aix5.1.*): Likewise.
	(rs6000-ibm-aix[56789].*, powerpc-ibm-aix[56789].*): Likewise.
	(s390x-ibm-tpf*): Add t-eh-dw2-dip to tmake_file.
	(xtensa*-*-elf*): Set tmake_file.
	(xtensa*-*-linux*): Likewise.
	* configure.ac: Include ../config/unwind_ipinfo.m4.
	Call GCC_CHECK_UNWIND_GETIPINFO.
	Link unwind.h to $unwind_header.
	* configure: Regenerate.
	* emutls.c, unwind-c.c, unwind-compat.c, unwind-compat.h,
	unwind-dw2-fde-compat.c, unwind-dw2-fde-dip.c, unwind-dw2-fde.c,
	unwind-dw2-fde.h, unwind-dw2.c, unwind-dw2.h, unwind-generic.h,
	unwind-pe.h, unwind-sjlj.c, unwind.inc: New files.
	* config/unwind-dw2-fde-darwin.c: New file.
	* config/arm/libunwind.S, config/arm/pr-support.c,
	config/arm/t-bpabi, config/arm/t-symbian, config/arm/unwind-arm.c,
	config/arm/unwind-arm.h,: New files.
	* config/ia64/fde-glibc.c, config/ia64/fde-vms.c,
	config/ia64/t-eh-ia64, config/ia64/t-glibc,
	config/ia64/t-glibc-libunwind, config/ia64/t-hpux,
	config/ia64/t-vms, config/ia64/unwind-ia64.c,
	config/ia64/unwind-ia64.h: New files.
	* config/picochip/t-picochip: New file.
	* config/rs6000/aix-unwind.h, config/rs6000/darwin-fallback.c: New
	files.
	* config/rs6000/t-darwin (LIB2ADDEH): Set.
	* config/s390/t-tpf (LIB2ADDEH): Remove.
	* config/t-darwin (LIB2ADDEH): Set.
	* config/t-eh-dw2-dip: New file.
	* config/t-libunwind, config/t-libunwind-elf: New files.
	* config/t-sol2 (LIB2ADDEH): Remove.
	* config/xtensa/t-xtensa: New file.

	gcc/ada:
	* gcc-interface/Makefile.in (raise-gcc.o): Search
	$(srcdir)/../libgcc.

	libgo:
	* Makefile.am (AM_CFLAGS): Search $(srcdir)/../libgcc.
	* Makefile.in: Regenerate.

	libjava:
	* configure.ac (GCC_UNWIND_INCLUDE): Rename to
	LIBGCC_UNWIND_INCLUDE.
	Point to $(multi_basedir)/./libjava/../libgcc.
	* configure: Regenerate.
	* Makefile.am (GCC_UNWIND_INCLUDE): Reflect this.
	* Makefile.in: Regenerate.

	libobjc:
	* Makefile.in (INCLUDES): Search
	$(srcdir)/$(MULTISRCTOP)../libgcc.

	libstdc++-v3:
	* acinclude.m4 (GLIBCXX_EXPORT_INCLUDES): Point TOPLEVEL_INCLUDES
	to $(toplevel_srcdir)/libgcc.
	* configure: Regenerate.

From-SVN: r177447

From-SVN: r145841

	* unwind-dw2.h (_Unwind_FrameState): Add REG_UNDEFINED enum value.
	* unwind-dw2.c (execute_cfa_program): Set how to REG_UNDEFINED
	instead of REG_UNSAVED for DW_CFA_undefined.
	(uw_update_context_1): Handle REG_UNDEFINED the same as REG_UNSAVED.
	(uw_update_context): If RA column is REG_UNDEFINED, mark it as
	outermost frame.

From-SVN: r145535

	* gcc/unwind-dw2.h: Move cfa-related variables into
	struct frame_state_reg_info to ensure that the CFA is properly
	handled when executing DW_CFA_{remember,restore}_state.
	* gcc/unwind-dw2.c, gcc/config/alpha/linux-unwind.h,
	gcc/config/alpha/vms-unwind.h, gcc/config/s390/tpf-unwind.h
	gcc/config/s390/linux-unwind.h, gcc/config/sparc/linux-unwind.h
	gcc/config/i386/linux-unwind.h, gcc/config/sh/linux-unwind.h
	gcc/config/rs6000/linux-unwind.h,
	gcc/config/rs6000/darwin-fallback.c, gcc/config/pa/linux-unwind.h,
	gcc/config/pa/hpux-unwind.h, gcc/config/mips/linux-unwind.h:
	Modify to use new cfa_* fields.

From-SVN: r118068

	* unwind-dw2.h (_Unwind_FrameState): Add REG_SAVED_VAL_OFFSET
	and REG_SAVED_VAL_EXP constants.
	* unwind-dw2.c (struct _Unwind_Context): Add by_value array.
	(_Unwind_GetGR, _Unwind_SetGR, _Unwind_GetGRPtr, _Unwind_SetGRPtr):
	Handle regs stored by value.
	(_Unwind_SetGRValue, _Unwind_GRByValue): New functions.
	(execute_cfa_program): Handle DW_CFA_val_offset,
	DW_CFA_val_offset_sf and DW_CFA_val_expression.
	(uw_update_context_1): Handle REG_SAVED_REG with regs stored by
	value specially.  Handle REG_SAVED_VAL_OFFSET and REG_SAVED_VAL_EXP.
	(uw_install_context_1): Handle target regs stored by value.

	* gcc.target/i386/cleanup-1.c: New test.
	* gcc.target/i386/cleanup-2.c: New test.

From-SVN: r111705

	PR other/26208
	* unwind-dw2.c (struct _Unwind_Context): Add signal_frame field.
	(extract_cie_info): Handle S flag in augmentation string.
	(execute_cfa_program): If context->signal_frame, execute also
	fs->pc == context->ra instructions.
	(uw_frame_state_for): If context->signal_frame, don't subtract one
	from context->ra to find FDE.
	(uw_update_context_1): Set context->signal_frame to
	fs->signal_frame.
	(_Unwind_GetIPInfo): New function.
	* unwind-dw2.h (_Unwind_FrameState): Add signal_frame field.
	* unwind-c.c (PERSONALITY_FUNCTION): Use _Unwind_GetIPInfo instead
	of _Unwind_GetIP.
	* unwind-sjlj.c (_Unwind_GetIPInfo): New function.
	* unwind-generic.h (_Unwind_GetIPInfo): New prototype.
	* unwind-compat.c (_Unwind_GetIPInfo): New function.
	* libgcc-std.ver (_Unwind_GetIPInfo): Export @@GCC_4.2.0.
	* config/ia64/unwind-ia64.c (_Unwind_GetIPInfo): New function.
	* config/arm/unwind-arm.h (_Unwind_GetIPInfo): Define.
	* config/i386/linux-unwind.h (x86_fallback_frame_state,
	x86_64_fallback_frame_state): Set fs->signal_frame.
	* config/rs6000/linux-unwind.h (ppc_fallback_frame_state): Likewise.
	(MD_FROB_UPDATE_CONTEXT): Define unconditionally.
	(frob_update_context): Likewise.  Workaround missing S flag in
	Linux 2.6.12 - 2.6.16 kernel vDSOs.
	* config/s390/linux-unwind.h (s390_fallback_frame_state): Likewise.
	Remove the psw_addr + 1 hack.
libjava/
	* exception.cc (PERSONALITY_FUNCTION): Use _Unwind_GetIPInfo instead
	of _Unwind_GetIP.
	* include/i386-signal.h (MAKE_THROW_FRAME): Change into empty macro.
	(HANDLE_DIVIDE_OVERFLOW): Don't adjust _res->eip if falling through
	to throw.
	* include/x86_64-signal.h (MAKE_THROW_FRAME): Change into empty
	macro.
	* include/powerpc-signal.h (MAKE_THROW_FRAME): Change into empty
	macro.
libstdc++-v3/
	* libsupc++/eh_personality.cc (PERSONALITY_FUNCTION): Use
	_Unwind_GetIPInfo instead of _Unwind_GetIP.

From-SVN: r111488

From-SVN: r101317

2004-06-28  Geoffrey Keating  <geoffk@apple.com>
	    Andreas Tobler  <a.tobler@schweiz.ch>

	PR 15813
	* dwarf2out.c (reg_save): Output DW_CFA_same_value when a
	register is saved in itself.
	(initial_return_save): If the return address is a register,
	it's already there, don't bother to mention it in the CFI.
	(struct queued_reg_save): Add field saved_reg.
	(struct reg_saved_in_data): New.
	(regs_saved_in_regs): New.
	(num_regs_saved_in_regs): New.
	(queue_reg_save): Add extra parameter to specify register saved
	in register.  Remove duplicate entries from queue.  Add comment
	for function.
	(flush_queued_reg_saves): Handle registers saved in registers.
	Update regs_saved_in_regs.  Add comment for function.
	(clobbers_queued_reg_save): Add comment for function.  Allow
	for regs_saved_in_regs.
	(reg_saved_in): New.
	(dwarf2out_frame_debug_expr): Handle saving registers in other
	registers.
	(dwarf2out_frame_debug): Reset regs_saved_in_regs.
	* unwind-dw2.c (execute_cfa_program): Correct handling of
	DW_CFA_same_value.  Add FIXME comment about incorrect implementation
	of DW_CFA_restore_extended.
	* config/rs6000/rs6000.c (rs6000_emit_prologue): Let
	dwarf2out_frame_debug_expr see instructions that save registers
	in other registers or save those other registers in memory.

	* unwind-dw2.c (DWARF_FRAME_REGISTERS): Move to unwind-dw2.h.
	(_Unwind_FrameState): Likewise.
	* unwind-dw2.h: New.
	* Makefile.in (LIB2ADDEHDEP): Add unwind-dw2.h.
	* config/rs6000/darwin-fallback.c: New file.
	* config/rs6000/darwin.h (MD_FALLBACK_FRAME_STATE_FOR): Define.
	* config/rs6000/t-darwin (LIB2FUNCS_EXTRA): Add darwin-fallback.o.

Index: gcc/testsuite/ChangeLog
2004-06-26  Geoffrey Keating  <geoffk@apple.com>
	    Andreas Tobler  <a.tobler@schweiz.ch>

	* gcc.dg/cleanup-10.c: Run on all Linux platforms and powerpc-darwin.
	Use SA_RESETHAND rather than SA_ONESHOT.  Trap SIGBUS as well
	as SIGSEGV.
	* gcc.dg/cleanup-11.c: Likewise.
	* gcc.dg/cleanup-8.c: Likewise.
	* gcc.dg/cleanup-9.c: Likewise.
	* gcc.dg/cleanup-5.c: Run on all platforms.

Index: libjava/ChangeLog
2004-06-26  Geoffrey Keating  <geoffk@apple.com>
	    Andreas Tobler  <a.tobler@schweiz.ch>

	* configure.host (powerpc-*-darwin*): New case, define
	can_unwind_signal.
	* configure.in (*-*-darwin*): New case, point to darwin-signal.h.
	* configure: Regenerate.
	* include/darwin-signal.h: New.

Co-Authored-By: Andreas Tobler <a.tobler@schweiz.ch>

From-SVN: r83953