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This fixes a basic mistake in the relative path used to reference
a rs6000 specific Makefile fragment in the libgcc configuration bits
for powerpc*-vxworks7.
2021-01-14 Fred Konrad <konrad@adacore.com>
libgcc/
* config.host (powerpc*-wrs-vxworks7*): Fix path to
rs6000/t-ppc64-fp, relative to config/ not libgcc/.
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This change arranges to provide the vxworks alternate stdint.h
at build time instead of at install time, so it is used instead
of the system one while building the libraries.
This is a lot more consistent and helps the build on configurations
where the system does not come with stdint.h at all.
The change uses a similar mechanism as the one previsouly introduced
for glimits.h and takes the opportunity to simplify the glimits.h
command to use an automatic variable.
This introduces an indirect dependency on the VxWorks version.h
for vxcrtstuff objects, for which we then need to apply the same
tricks as for libgcc2 regarding include paths (to select the system
header instead of the gcc one).
2021-02-12 Olivier Hainque <hainque@adacore.com>
Rasmus Villemoes <rv@rasmusvillemoes.dk>
gcc/
* Makefile.in (T_STDINT_GCC_H): New variable, path to
stdint-gcc.h that a target configuration may override when
use_gcc_stdint is "provide".
(stmp-int-hdrs): Depend on it and copy that for
USE_GCC_INT=provide.
* config.gcc (vxworks): Revert to use_gcc_stdint=provide.
* config/t-vxworks (T_STDINT_GCC_H): Define, as vxw-stdint-gcc.h.
(vxw-stdint-gcc.h): New target, produced from the original
stdint-gcc.h.
(vxw-glimits.h): Use an automatic variable to designate the
first and only prerequisite.
* config/vxworks/stdint.h: Remove.
libgcc/
* config/t-vxworks: Set CRTSTUFF_T_CFLAGS to
$(LIBGCC2_INCLUDES).
* config/t-vxworks7: Likewise.
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In order to reslve a long-standing issue with inter-operation
with libSystem, we have bumped the SO name for libgcc_s.
Distributions might wish to install this new version into a
structure where exisiting code is already linked with the
compiler-local libgcc_s.1 (providing symbols exported by the
now-retired libgcc_ext.10.x shims).
The replacement libgcc_s.1 forwards the symbols from the new SO.
In order to support DYLD_LIBRARY_PATH on systems (where it works)
we forward the libSystem unwinder symbols from 10.7+ and a
compiler-local version of the libgcc unwinder on earlier.
For macOS 10.4 to 10.6 this is 'bug-compatible' with existing uses.
For 10.7+ the behaviour will now actually be correct.
This should be squashed with the initial libgcc changes for PR80556
in any backport (r12-5418-gd4943ce939d)
libgcc/ChangeLog:
* config.host (*-*-darwin*): Add logic to build a shared
unwinder library for Darwin8-10.
* config/i386/t-darwin: Build legacy libgcc_s.1.
* config/rs6000/t-darwin: Likewise.
* config/t-darwin: Reorganise the EH fragments to place
them for inclusion in a shared EH lib.
* config/t-slibgcc-darwin: Build a legacy libgcc_s.1 and
the supporting pieces (all FAT libs).
* config/t-darwin-noeh: Removed.
* config/darwin-unwind.ver: New file.
* config/rs6000/t-darwin-ehs: New file.
* config/t-darwin-ehs: New file.
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This is the original binutils bugzilla report,
https://sourceware.org/bugzilla/show_bug.cgi?id=28509
And this is the first version of the proposed binutils patch,
https://sourceware.org/pipermail/binutils/2021-November/118398.html
After applying the binutils patch, I get the the unexpected error when
building libgcc,
/scratch/nelsonc/riscv-gnu-toolchain/riscv-gcc/libgcc/config/riscv/div.S:42:
/scratch/nelsonc/build-upstream/rv64gc-linux/build-install/riscv64-unknown-linux-gnu/bin/ld: relocation R_RISCV_JAL against `__udivdi3' which may bind externally can not be used when making a shared object; recompile with -fPIC
Therefore, this patch add an extra hidden alias symbol for __udivdi3, and
then use HIDDEN_JUMPTARGET to target a non-preemptible symbol instead.
The solution is similar to glibc as follows,
https://sourceware.org/git/?p=glibc.git;a=commit;h=68389203832ab39dd0dbaabbc4059e7fff51c29b
libgcc/ChangeLog:
* config/riscv/div.S: Add the hidden alias symbol for __udivdi3, and
then use HIDDEN_JUMPTARGET to target it since it is non-preemptible.
* config/riscv/riscv-asm.h: Added new macros HIDDEN_JUMPTARGET and
HIDDEN_DEF.
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When vxcrtstuff.c was created, the set of #includes was copied from
crtstuff.c. But crtstuff.c also has a bunch of #undefs after the first
#include, because, as the comment says, including auto-host.h when
building objects that are meant for target is technically not
correct.
This manifests when I try do do a canadian cross, with build=linux,
host=windows and target=vxworks, in that we pick up a
#define caddr_t char *
from auto-host.h, which then of course creates a problem when we later
include a target header that has
typedef char * caddr_t;
I assume that the #undefs in crtstuff.c have been added for similar
reasons.
These potentially problematic #defines all seem to be guarded by
#ifndef USED_FOR_TARGET, which tconfig.h defines before including
auto-host.h. So at first, it seems that one could avoid the problem
by simply removing the initial include of auto-host.h. Unfortunately,
we do need some of the things defined in auto-host.h within such an
ifndef USED_FOR_TARGET, namely the define of
HAVE_INITFINI_ARRAY_SUPPORT, which is what later causes
initfini-array.h to define USE_INITFINI_ARRAY. So as the next best
fix, just copy the #undefs from crtstuff.c.
libgcc/
* config/vxcrtstuff.c: Undefine caddr_t, pid_t, rlim_t,
ssize_t and vfork after including auto-host.h.
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Since commit 78e49fb1bc (Introduce vxworks specific crtstuff support),
the generic crtbegin.o/crtend.o have been unnecessary to build. So
remove them from extra_parts.
This is effectively a revert of commit 9a5b8df70 (libgcc: add
crt{begin,end} for powerpc-wrs-vxworks target).
libgcc/
* config.host (powerpc-wrs-vxworks): Do not add crtbegin.o and
crtend.o to extra_parts.
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2021-11-27 John David Anglin <danglin@gcc.gnu.org>
libgcc/ChangeLog:
* config/pa/t-dimode (lib2difuncs): Fix typo.
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This allows switching to a different implementation for
PT_GNU_EH_FRAME lookup in a subsequent commit.
This moves some of the PT_GNU_EH_FRAME parsing out of the glibc loader
lock that is implied by dl_iterate_phdr. However, the FDE is already
parsed outside the lock before this change, so this does not introduce
additional crashes in case of a concurrent dlclose.
libgcc/ChangeLog:
* unwind-dw2-fde-dip.c (struct unw_eh_callback_data): Add hdr.
Remove func, ret.
(find_fde_tail): New function. Split from
_Unwind_IteratePhdrCallback. Move the result initialization
from _Unwind_Find_FDE.
(_Unwind_Find_FDE): Updated to call find_fde_tail.
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Only bfin, frv, i386 and nios2 need this member at present.
libgcc/ChangeLog
* unwind-dw2-fde-dip.c (NEED_DBASE_MEMBER): Define.
(struct unw_eh_callback_data): Make dbase member conditional.
(unw_eh_callback_data_dbase): New function.
(base_from_cb_data): Simplify for the non-dbase case.
(_Unwind_IteratePhdrCallback): Adjust.
(_Unwind_Find_FDE): Likewise.
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It is always a null pointer.
libgcc/ChangeLog
* unwind-dw2-fde-dip.c (struct unw_eh_callback_data): Remove
tbase member.
(base_from_cb_data): Adjust.
(_Unwind_IteratePhdrCallback): Likewise.
(_Unwind_Find_FDE): Likewise.
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This addresses a long-standing problem where a work-around for an unwinder
issue (also a regression) regresses other functionality. The patch replaces
several work-arounds with a fix for PR80556 and a work-around for PR88590.
* The fix for PR80556 requires a bump to the SO name for libgcc_s, since we
need to remove the unwinder symbols from it. This would trigger PR88590
hence the work-around for that.
* We weaken the symbols for emulated TLS support so that it is possible
for a DSO linked with static-libgcc to interoperate with a DSO linked with
libgcc_s. Likewise main exes.
* We remove all the gcc-4.2.1 era stubs machinery and workarounds.
* libgcc is always now linked ahead of libc, which avoids fails where the
libc (libSystem) builtins implementations are not up to date.
* The unwinder now always comes from the system
- for Darwin9 from /usr/lib/libgcc_s.1.dylib
- for Darwin10 from /usr/lib/libSystem.dylib
- for Darwin11+ from /usr/lib/system/libunwind.dylib.
We still insert a shim on Darwin10 to fix an omitted unwind function, but
the underlying unwinder remains the system one.
* The work-around for PR88590 has two parts (1) we always link libgcc from
its convenience lib on affected system versions (avoiding the need to find
the DSO path); (2) we add and export the emutls functions from DSOs - this
makes a relatively small (20k) addition to a DSO. These can be backed out
when a proper fix for PR88590 is committed.
For distributions that wish to install a libgcc_s.1.dylib to satisfy linkage
from exes that linked against the stubs can use a reexported libgcc_s.1.1
(since that contains all the symbols that were previously exported via the
stubs).
Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
gcc/ChangeLog:
PR target/80556
* config/darwin-driver.c (darwin_driver_init): Handle exported
symbols and symbol lists (suppress automatic export of the TLS
symbols).
* config/darwin.c (darwin_rename_builtins): Remove workaround.
* config/darwin.h (LINK_GCC_C_SEQUENCE_SPEC): Likewise.
(REAL_LIBGCC_SPEC): Handle revised library uses.
* config/darwin.opt (nodefaultexport): New.
* config/i386/darwin.h (PR80556_WORKAROUND): Remove.
* config/i386/darwin32-biarch.h (PR80556_WORKAROUND): Likewise.
* config/i386/darwin64-biarch.h (PR80556_WORKAROUND): Likewise.
libgcc/ChangeLog:
* config.host: Add weak emutls crt to the extra_parts.
* config/i386/darwin-lib.h (DECLARE_LIBRARY_RENAMES): Remove
workaround.
* config/libgcc-libsystem.ver: Add exclude list for the system-
provided unwinder.
* config/t-slibgcc-darwin: Bump SO version, remove stubs code.
* config/i386/libgcc-darwin.10.4.ver: Removed.
* config/i386/libgcc-darwin.10.5.ver: Removed.
* config/rs6000/libgcc-darwin.10.4.ver: Removed.
* config/rs6000/libgcc-darwin.10.5.ver: Removed.
* config/t-darwin-noeh: New file.
gcc/testsuite/ChangeLog:
* gcc.dg/torture/fp-int-convert-timode-3.c: Remove XFAIL.
* gcc.dg/torture/fp-int-convert-timode-4.c: Likewise.
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In order to better support use of the emulated TLS between objects with
DSO dependencies and static-linked libgcc, allow a target to make weak
definitions.
Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
libgcc/ChangeLog:
* config/t-darwin: Build weak-defined emutls objects.
* emutls.c (__emutls_get_address): Add optional attributes.
(__emutls_register_common): Likewise.
(EMUTLS_ATTR): New.
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At the end of the backtrace stream _Unwind_Find_FDE() may not be able
to find the frame unwind info and will later call the backtrace fallback
instead of finishing. This occurs when using an old libc on ppc64 due to
dl_iterate_phdr() not being able to set the fde in the last trace.
When this occurs the cfa of the trace will be behind of context's cfa.
Also, libgo’s probestackmaps() calls the backtrace with a null pointer
and can get to the backchain fallback with the same problem, in this case
we are only interested in find a stack map, we don't need nor can do a
backchain.
_Unwind_ForcedUnwind_Phase2() can hit the same issue as it uses
uw_frame_state_for(), so we need to treat _URC_NORMAL_STOP.
libgcc/ChangeLog:
PR libgcc/103044
* config/rs6000/linux-unwind.h (ppc_backchain_fallback): Check if it's
called with a null argument or at the end of the backtrace and return.
* unwind.inc (_Unwind_ForcedUnwind_Phase2): Treat _URC_NORMAL_STOP.
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Jonathan reported and I've verified a
In file included from ../../../libgcc/unwind-dw2.c:412:
./md-unwind-support.h:398:6: warning: no previous prototype for ‘ppc_backchain_fallback’ [-Wmissing-prototypes]
398 | void ppc_backchain_fallback (struct _Unwind_Context *context, void *a)
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warning on powerpc*-linux* libgcc build.
All the other MD_* macro functions are static, so I think the following
is the right thing rather than adding a previous prototype for
ppc_backchain_fallback.
2021-11-10 Jakub Jelinek <jakub@redhat.com>
* config/rs6000/linux-unwind.h (ppc_back_fallback): Make it static,
formatting fix.
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We have a shim crt for Darwin10 that implements functionality
missing in libSystem. Provide this with a prototype to silence the
warning about this.
libgcc/ChangeLog:
* config/darwin10-unwind-find-enc-func.c: Include libgcc_tm.h.
* config/i386/darwin-lib.h: Declare Darwin10 crt function.
Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
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This change implements TI mode on PA64. Various new patterns are
added to pa.md. The libgcc build needed modification to build both
DI and TI routines. We also need various softfp routines to
convert to and from TImode.
I added full softfp for the -msoft-float option. At the moment,
this doesn't completely eliminate all use of the floating-point
co-processor. For this, libgcc needs to be built with -msoft-mult.
The floating-point exception support also needs a soft option.
2021-11-05 John David Anglin <danglin@gcc.gnu.org>
PR libgomp/96661
gcc/ChangeLog:
* config/pa/pa-modes.def: Add OImode integer type.
* config/pa/pa.c (pa_scalar_mode_supported_p): Allow TImode
for TARGET_64BIT.
* config/pa/pa.h (MIN_UNITS_PER_WORD) Define to MIN_UNITS_PER_WORD
to UNITS_PER_WORD if IN_LIBGCC2.
* config/pa/pa.md (addti3, addvti3, subti3, subvti3, negti2,
negvti2, ashlti3, shrpd_internal): New patterns.
Change some multi instruction types to multi.
libgcc/ChangeLog:
* config.host (hppa*64*-*-linux*): Revise tmake_file.
(hppa*64*-*-hpux11*): Likewise.
* config/pa/sfp-exceptions.c: New.
* config/pa/sfp-machine.h: New.
* config/pa/t-dimode: New.
* config/pa/t-softfp-sfdftf: New.
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The file fptr.c is specific to 32-bit hppa-linux and should not be
included in LIB2ADD on hppa64-linux.
There is a builtin type mismatch in linux-atomic.c using the type
long long unsigned int for 64-bit atomic operations on hppa64-linux.
2021-10-27 John David Anglin <danglin@gcc.gnu.org>
libgcc/ChangeLog:
* config.host (hppa*64*-*-linux*): Don't add pa/t-linux to
tmake_file.
* config/pa/linux-atomic.c: Define u8, u16 and u64 types.
Use them in FETCH_AND_OP_2, OP_AND_FETCH_2, COMPARE_AND_SWAP_2,
SYNC_LOCK_TEST_AND_SET_2 and SYNC_LOCK_RELEASE_1 macros.
* config/pa/t-linux64 (LIB1ASMSRC): New define.
(LIB1ASMFUNCS): Revise.
(HOST_LIBGCC2_CFLAGS): Add "-DLINUX=1".
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This was not defined in the spec and not consistent in the
implementation causing incosistent behavior. After review we have
updated the CPU implementations and proposed the spec be updated to
specific that FPU tininess checks check for tininess before roudning.
Architecture change draft:
https://openrisc.io/proposals/p18-fpu-tininess
libgcc/ChangeLog:
* config/or1k/sfp-machine.h (_FP_TININESS_AFTER_ROUNDING):
Change to 0.
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Without dwarf2 unwind tables available _Unwind_Backtrace() is not
able to return the full backtrace.
This patch adds a fallback function on powerpc to get the backtrace
by doing a backchain, this code was originally at glibc.
libgcc/ChangeLog:
* config/rs6000/linux-unwind.h (struct rt_sigframe): Move it to
outside of get_regs() in order to use it in another function, this
is done twice: for __powerpc64__ and for !__powerpc64__.
(struct trace_arg): New struct.
(struct layout): New struct.
(ppc_backchain_fallback): New function.
* unwind.inc (_Unwind_Backtrace): Look for _URC_NORMAL_STOP code
state and call MD_BACKCHAIN_FALLBACK.
gcc/testsuite/ChangeLog:
* gcc.target/powerpc/unwind-backchain.c: New test.
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Support merging of profiles that are built from a different .o files
but belong to the same source file. Moreover, a checksum is verified
during profile merging and so we can safely combine such profile.
PR gcov-profile/90364
gcc/ChangeLog:
* coverage.c (build_info): Emit checksum to the global variable.
(build_info_type): Add new field for checksum.
(coverage_obj_finish): Pass object_checksum.
(coverage_init): Use 0 as checksum for .gcno files.
* gcov-dump.c (dump_gcov_file): Dump also new checksum field.
* gcov.c (read_graph_file): Read also checksum.
* doc/invoke.texi: Document the behaviour change.
libgcc/ChangeLog:
* libgcov-driver.c (merge_one_data): Skip timestamp and verify
checksums.
(write_one_data): Write also checksum.
* libgcov-util.c (read_gcda_file): Read also checksum field.
* libgcov.h (struct gcov_info): Add new field.
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* config/i386/morestack.S: Use .init_array for constructor if
available.
* config/rs6000/morestack.S: Likewise.
* config/s390/morestack.S: Likewise.
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- - - -
New in version 6: Due to an oversight (i.e. coding error), version 5
changed the use of __LIBGCC_TF_EPSILON__ to __LIBGCC_DF_EPSILON__ but
not the other LIBGCC_TF values. For correct execution of the long
double test case it is necessary to also switch to using
__LIBGCC_DF_MIN__. For consistency we also switch to using
__LIBGCC_DF_MAX__. LDBL_MIN is 2**53 times as larger than DBL_MIN.
The larger value causes the code to switch the order of computation
when it is not optimal, resulting in failure for one of the values
in the cdivchk_ld.c test. Using DBL_MIN does not cause that failure..
There may be opportunity for further refinement of IBM128 format
Long Double complex divide, but that's beyond the scope of this
patch.
- - - -
This revision adds a test in libgcc/libgcc2.c for when
"__LIBGCC_TF_MANT_DIG__ == 106" to use __LIBGCC_DF_EPSILON__ instead
of __LIBGCC_TF_EPSILON__. That is specific to IBM 128-bit format long
doubles where EPSILON is very, very small and 1/EPSILON oveflows to
infinity. This change avoids the overflow without affecting any other
platform. Discussion in the patch is adjusted to reflect this
limitation.
It does not make any changes to .../rs6000/_divkc3.c, leaving it to
use __LIBGCC_KF__*. That means the upstream gcc will not build in
older IBM environments that do not recognize the KF floating point
mode properly. Environments that do not need IBM longdouble support
do build cleanly.
- - - -
This patch addresses the failure of powerpc64 long double complex divide
in native ibm long double format after the patch "Practical improvement
to libgcc complex divide".
The new code uses the following macros which are intended to be mapped
to appropriate values according to the underlying hardware representation.
See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101104
RBIG a value near the maximum representation
RMIN a value near the minimum representation
(but not in the subnormal range)
RMIN2 a value moderately less than 1
RMINSCAL the inverse of RMIN2
RMAX2 RBIG * RMIN2 - a value to limit scaling to not overflow
When "long double" values were not using the IEEE 128-bit format but
the traditional IBM 128-bit, the previous code used the LDBL values
which caused overflow for RMINSCAL. The new code uses the DBL values.
RBIG LDBL_MAX = 0x1.fffffffffffff800p+1022
DBL_MAX = 0x1.fffffffffffff000p+1022
RMIN LDBL_MIN = 0x1.0000000000000000p-969
RMIN DBL_MIN = 0x1.0000000000000000p-1022
RMIN2 LDBL_EPSILON = 0x0.0000000000001000p-1022 = 0x1.0p-1074
RMIN2 DBL_EPSILON = 0x1.0000000000000000p-52
[ORMINSCAL 1/LDBL_EPSILON = inf (1.0p+1074 does not fit in IBM 128-bit).
1/DBL_EPSILON = 0x1.0000000000000000p+52
RMAX2 = RBIG * RMIN2 = 0x1.fffffffffffff800p-52
RBIG * RMIN2 = 0x1.fffffffffffff000p+970
The MAX and MIN values have only modest changes since the maximum and
minimum values are about the same as for double precision. The
EPSILON field is considerably different. Due to how very small values
can be represented in the lower 64 bits of the IBM 128-bit floating
point, EPSILON is extremely small, so far beyond the desired value
that inversion of the value overflows and even without the overflow,
the RMAX2 is so small as to eliminate most usage of the test.
The change has been tested on gcc135.fsffrance.org and gains the
expected improvements in accuracy for long double complex divide.
libgcc/
PR target/101104
* libgcc2.c (RMIN2, RMINSCAL, RMAX2):
Use more correct values for native IBM 128-bit.
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These two symbols have been emitted since 4.8, but were not added
to the Darwin exports, so we have been using the ones from libgcc.a.
Added to libgcc_s now.
Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
libgcc/ChangeLog:
* config/i386/libgcc-darwin.ver: Add Symbols for
__cpu_model, __cpu_indicator_init.
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Existing code in the sfp-machine header has been using __MACH__
as a guard for Mach-O, where currently symbols aliases are not
supported.
__MACH__ is not a sufficient guard for this, since the define
is also emitted for HURD, at least.
Fixed by amending the guard to use __APPLE__ instead.
Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
libgcc/ChangeLog:
* config/i386/sfp-machine.h: Guard Mach-O-specific code
using __APPLE__.
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These were used on older systems to equate the FAT libgcc_s
library to single-slice equivalents. Unused for any current
system and never emitted by GCC.
Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
libgcc/ChangeLog:
* config/t-slibgcc-darwin: Delete unused code.
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This reorganises the Darwin symbol vers files to include
the generic ones at the top level; allowing for arch ports
to override (via either exclusion or inclusion as needed).
We add an X86-specific vers file containing the new HF
symbols. Note that although Darwin does not use ELF-style
symbol versioning - the parser that produces the map can
consume it. Using the ELF-style description will help us
know at which rev the symbols were introduced.
Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
libgcc/ChangeLog:
* config/i386/t-darwin: Add in a vers file for X86-specific
symbols.
* config/t-darwin: Add the generic symbol maps here...
* config/t-slibgcc-darwin: ... removing from here.
* config/i386/libgcc-darwin.ver: New file.
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We want to override the libgcc2 generic version of these functions
for X86. First exclude the original and the add in the replacements.
Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
libgcc/ChangeLog:
* config/i386/t-softfp: Exclude libgcc2 versions of __divhc3
and __mulhc3.
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We have a small unwinder shim that is only used for Darwin10
(and only then in quite specific cases). To avoid linking
this code for every executable or DSO, we can present the crt
as a convenience library (rather than a .o file).
Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
gcc/ChangeLog:
* config/darwin.h (LINK_COMMAND_SPEC_A): Use Darwin10
unwinder shim as a convenience library.
libgcc/ChangeLog:
* config.host: Use convenience library for Darwin10
unwinder shim.
* config/t-darwin: Build Darwin10 unwinder shim as a
convenience library.
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