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14972 Commits

Author SHA1 Message Date
Florian Weimer
a2a6bce7d7 Linux: Implement a useful version of _startup_fatal 
On i386 and ia64, the TCB is not available at this point.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
 2022-05-09 18:15:16 +02:00
Florian Weimer
18bd9c3d3b ia64: Always define IA64_USE_NEW_STUB as a flag macro 
And keep the previous definition if it exists.  This allows
disabling IA64_USE_NEW_STUB while keeping USE_DL_SYSINFO defined.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
 2022-05-09 18:15:16 +02:00
Adhemerval Zanella
71e2a681f1 linux: Fix posix_spawn return code if clone fails (BZ#29109) 
The __clone_internal returns the error on errno.

Checked on x86_64-linux-gnu.
 2022-05-06 10:48:30 -03:00
Xiaoming Ni
ed2ddeffa5 clock_adjtime: Use __nonnull to avoid null pointer 
clock_adjtime()/clock_adjtime64()
Add __nonnull((2)) to avoid null pointer access.

Link: https://sourceware.org/bugzilla/show_bug.cgi?id=27662
Link: https://sourceware.org/bugzilla/show_bug.cgi?id=29084
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
 2022-05-05 17:48:04 +05:30
Xiaoming Ni
6a9786b8ec ntp_xxxtimex: Use __nonnull to avoid null pointer 
ntp_gettime()
ntp_gettime64()
ntp_gettimex()
ntp_gettimex64()
ntp_adjtime()
Add __nonnull((1)) to avoid null pointer access.

Link: https://sourceware.org/bugzilla/show_bug.cgi?id=27662
Link: https://sourceware.org/bugzilla/show_bug.cgi?id=29084
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
 2022-05-05 17:48:04 +05:30
Xiaoming Ni
d62a70fda8 adjtimex/adjtimex64: Use __nonnull to avoid null pointer 
Add __nonnull((1)) to the adjtimex()/adjtimex64() function declaration
    to avoid null pointer access.

Link: https://sourceware.org/bugzilla/show_bug.cgi?id=27662
Link: https://sourceware.org/bugzilla/show_bug.cgi?id=29084
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
 2022-05-05 17:48:04 +05:30
Samuel Thibault
eff158b75d hurd spawni: Fix reauthenticating closed fds 
When an fd is closed, the port cell remains, but the port becomes
MACH_PORT_NULL, so we have to guard against it.
 2022-05-05 02:14:43 +02:00
Florian Weimer
c1b68685d4 Linux: Define MMAP_CALL_INTERNAL 
Unlike MMAP_CALL, this avoids a TCB dependency for an errno update
on failure.

<mmap_internal.h> cannot be included as is on several architectures
due to the definition of page_unit, so introduce a separate header
file for the definition of MMAP_CALL and MMAP_CALL_INTERNAL,
<mmap_call.h>.

Reviewed-by: Stefan Liebler <stli@linux.ibm.com>
 2022-05-04 15:37:21 +02:00
Florian Weimer
60f0f2130d i386: Honor I386_USE_SYSENTER for 6-argument Linux system calls 
Introduce an int-80h-based version of __libc_do_syscall and use
it if I386_USE_SYSENTER is defined as 0.

Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-05-04 15:37:21 +02:00
Florian Weimer
6e5c7a1e26 i386: Remove OPTIMIZE_FOR_GCC_5 from Linux libc-do-syscall.S 
After commit a78e6a10d0
("i386: Remove broken CAN_USE_REGISTER_ASM_EBP (bug 28771)"),
it is never defined.

Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-05-04 15:37:21 +02:00
Fangrui Song
4e7e4f3b4b powerpc32: Remove unused HAVE_PPC_SECURE_PLT 
82a79e7d18 removed the only user of
HAVE_PPC_SECURE_PLT.

Reviewed-by: Florian Weimer <fweimer@redhat.com>
 2022-05-02 08:55:36 -07:00
Siddhesh Poyarekar
5b5b1012d5 benchtests: Better libmvec integration 
Improve libmvec benchmark integration so that in future other
architectures may be able to run their libmvec benchmarks as well.  This
now allows libmvec benchmarks to be run with `make BENCHSET=bench-math`.

Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
 2022-04-29 11:48:18 +05:30
Siddhesh Poyarekar
944afe6d95 benchtests: Add UNSUPPORTED benchmark status 
The libmvec benchmarks print a message indicating that a certain CPU
feature is unsupported and exit prematurelyi, which breaks the JSON in
bench.out.

Handle this more elegantly in the bench makefile target by adding
support for an UNSUPPORTED exit status (77) so that bench.out continues
to have output for valid tests.

Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
 2022-04-29 11:48:16 +05:30
Adhemerval Zanella
118a2aee07 linux: Fix fchmodat with AT_SYMLINK_NOFOLLOW for 64 bit time_t (BZ#29097) 
The AT_SYMLINK_NOFOLLOW emulation ues the default 32 bit stat internal
calls, which fails with EOVERFLOW if the file constains timestamps
beyond 2038.

Checked on i686-linux-gnu.
 2022-04-28 09:58:44 -03:00
Noah Goldstein
911c63a51c sysdeps: Add 'get_fast_jitter' interace in fast-jitter.h 
'get_fast_jitter' is meant to be used purely for performance
purposes. In all cases it's used it should be acceptable to get no
randomness (see default case). An example use case is in setting
jitter for retries between threads at a lock. There is a
performance benefit to having jitter, but only if the jitter can
be generated very quickly and ultimately there is no serious issue
if no jitter is generated.

The implementation generally uses 'HP_TIMING_NOW' iff it is
inlined (avoid any potential syscall paths).
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-27 17:17:43 -05:00
DJ Delorie
7c477b57a3 posix/glob.c: update from gnulib 
Copied from gnulib/lib/glob.c in order to fix rhbz 1982608
Also fixes swbz 25659

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
 2022-04-27 17:19:31 -04:00
Adhemerval Zanella
834ddd0432 linux: Fix missing internal 64 bit time_t stat usage 
These are two missing spots initially done by 52a5fe70a2.

Checked on i686-linux-gnu.
 2022-04-27 14:21:07 -03:00
Adhemerval Zanella
4f7b7d00e0 posix: Remove unused definition on _Fork 
Checked on x86_64-linux-gnu.
 2022-04-26 14:21:08 -03:00
Fangrui Song
098a657fe4 elf: Replace PI_STATIC_AND_HIDDEN with opposite HIDDEN_VAR_NEEDS_DYNAMIC_RELOC 
PI_STATIC_AND_HIDDEN indicates whether accesses to internal linkage
variables and hidden visibility variables in a shared object (ld.so)
need dynamic relocations (usually R_*_RELATIVE). PI (position
independent) in the macro name is a misnomer: a code sequence using GOT
is typically position-independent as well, but using dynamic relocations
does not meet the requirement.

Not defining PI_STATIC_AND_HIDDEN is legacy and we expect that all new
ports will define PI_STATIC_AND_HIDDEN. Current ports defining
PI_STATIC_AND_HIDDEN are more than the opposite. Change the configure
default.

No functional change.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
 2022-04-26 09:26:22 -07:00
Carlos O'Donell
e465d97653 i386: Regenerate ulps 
These failures were caught while building glibc master for Fedora
Rawhide which is built with '-mtune=generic -msse2 -mfpmath=sse'
using gcc 11.3 (gcc-11.3.1-2.fc35) on a Cascadelake Intel Xeon
processor.
 2022-04-26 10:52:41 -04:00
Fangrui Song
693517b922 elf: Remove unused enum allowmask 
Unused since 52a01100ad
("elf: Remove ad-hoc restrictions on dlopen callers [BZ #22787]").

Reviewed-by: Florian Weimer <fweimer@redhat.com>
 2022-04-25 01:01:02 -07:00
Noah Goldstein
c966099cdc x86: Optimize {str|wcs}rchr-evex 
The new code unrolls the main loop slightly without adding too much
overhead and minimizes the comparisons for the search CHAR.

Geometric Mean of all benchmarks New / Old: 0.755
See email for all results.

Full xcheck passes on x86_64 with and without multiarch enabled.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-22 23:08:43 -05:00
Noah Goldstein
df7e295d18 x86: Optimize {str|wcs}rchr-avx2 
The new code unrolls the main loop slightly without adding too much
overhead and minimizes the comparisons for the search CHAR.

Geometric Mean of all benchmarks New / Old: 0.832
See email for all results.

Full xcheck passes on x86_64 with and without multiarch enabled.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-22 23:08:40 -05:00
Noah Goldstein
5307aa9c18 x86: Optimize {str|wcs}rchr-sse2 
The new code unrolls the main loop slightly without adding too much
overhead and minimizes the comparisons for the search CHAR.

Geometric Mean of all benchmarks New / Old: 0.741
See email for all results.

Full xcheck passes on x86_64 with and without multiarch enabled.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-22 23:08:36 -05:00
H.J. Lu
8ea20ee5f6 x86-64: Fix SSE2 memcmp and SSSE3 memmove for x32 
Clear the upper 32 bits in RDX (memory size) for x32 to fix

FAIL: string/tst-size_t-memcmp
FAIL: string/tst-size_t-memcmp-2
FAIL: string/tst-size_t-memcpy
FAIL: wcsmbs/tst-size_t-wmemcmp

on x32 introduced by

8804157ad9 x86: Optimize memcmp SSE2 in memcmp.S
26b2478322 x86: Reduce code size of mem{move|pcpy|cpy}-ssse3

Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
 2022-04-22 11:23:15 -07:00
Florian Weimer
198abcbb94 Default to --with-default-link=no (bug 25812) 
This is necessary to place the libio vtables into the RELRO segment.
New tests elf/tst-relro-ldso and elf/tst-relro-libc are added to
verify that this is what actually happens.

The new tests fail on ia64 due to lack of (default) RELRO support
inbutils, so they are XFAILed there.
 2022-04-22 10:59:03 +02:00
Fangrui Song
a8e9b5b807 m68k: Handle fewer relocations for RTLD_BOOTSTRAP (#BZ29071) 
m68k is a non-PI_STATIC_AND_HIDDEN arch which uses a GOT relocation when
loading the address of a jump table. The GOT load may be reordered
before processing R_68K_RELATIVE relocations, leading to an
unrelocated/incorrect jump table, which will cause a crash.

The foolproof approach is to add an optimization barrier (e.g. calling
an non-inlinable function after relative relocations are resolved). That
is non-trivial given the current code structure, so just use the simple
approach to avoid the jump table: handle only the essential reloctions
for RTLD_BOOTSTRAP code.

This is based on Andreas Schwab's patch and fixed ld.so crash on m68k.

Reviewed-by: Adheemrval Zanella  <adhemerval.zanella@linaro.org>
 2022-04-20 10:24:16 -07:00
Noah Goldstein
c72a1a062a x86: Fix missing __wmemcmp def for disable-multiarch build 
commit 8804157ad9
Author: Noah Goldstein <goldstein.w.n@gmail.com>
Date:   Fri Apr 15 12:27:59 2022 -0500

    x86: Optimize memcmp SSE2 in memcmp.S

Only defined wmemcmp and missed __wmemcmp. This commit fixes that by
defining __wmemcmp and setting wmemcmp as a weak alias to __wmemcmp.

Both multiarch and disable-multiarch builds succeed and full xchecks
pass.

Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-19 20:18:57 -05:00
Fangrui Song
3e9acce8c5 elf: Remove __libc_init_secure 
After 73fc4e28b9,
__libc_enable_secure_decided is always 0 and a statically linked
executable may overwrite __libc_enable_secure without considering
AT_SECURE.

The __libc_enable_secure has been correctly initialized in _dl_aux_init,
so just remove __libc_enable_secure_decided and __libc_init_secure.
This allows us to remove some startup_get*id functions from
22b79ed7f4.

Reviewed-by: Florian Weimer <fweimer@redhat.com>
 2022-04-19 15:52:27 -07:00
=Joshua Kinard
78fb888273 mips: Fix mips64n32 64 bit time_t stat support (BZ#29069) 
Add missing support initially added by 4e8521333b
(which missed n32 stat).
 2022-04-18 10:02:25 -03:00
Noah Goldstein
23102686ec x86: Cleanup page cross code in memcmp-avx2-movbe.S 
Old code was both inefficient and wasted code size. New code (-62
bytes) and comparable or better performance in the page cross case.

geometric_mean(N=20) of page cross cases New / Original: 0.960

size, align0, align1, ret, New Time/Old Time
   1,   4095,      0,   0,             1.001
   1,   4095,      0,   1,             0.999
   1,   4095,      0,  -1,               1.0
   2,   4094,      0,   0,               1.0
   2,   4094,      0,   1,               1.0
   2,   4094,      0,  -1,               1.0
   3,   4093,      0,   0,               1.0
   3,   4093,      0,   1,               1.0
   3,   4093,      0,  -1,               1.0
   4,   4092,      0,   0,             0.987
   4,   4092,      0,   1,               1.0
   4,   4092,      0,  -1,               1.0
   5,   4091,      0,   0,             0.984
   5,   4091,      0,   1,             1.002
   5,   4091,      0,  -1,             1.005
   6,   4090,      0,   0,             0.993
   6,   4090,      0,   1,             1.001
   6,   4090,      0,  -1,             1.003
   7,   4089,      0,   0,             0.991
   7,   4089,      0,   1,               1.0
   7,   4089,      0,  -1,             1.001
   8,   4088,      0,   0,             0.875
   8,   4088,      0,   1,             0.881
   8,   4088,      0,  -1,             0.888
   9,   4087,      0,   0,             0.872
   9,   4087,      0,   1,             0.879
   9,   4087,      0,  -1,             0.883
  10,   4086,      0,   0,             0.878
  10,   4086,      0,   1,             0.886
  10,   4086,      0,  -1,             0.873
  11,   4085,      0,   0,             0.878
  11,   4085,      0,   1,             0.881
  11,   4085,      0,  -1,             0.879
  12,   4084,      0,   0,             0.873
  12,   4084,      0,   1,             0.889
  12,   4084,      0,  -1,             0.875
  13,   4083,      0,   0,             0.873
  13,   4083,      0,   1,             0.863
  13,   4083,      0,  -1,             0.863
  14,   4082,      0,   0,             0.838
  14,   4082,      0,   1,             0.869
  14,   4082,      0,  -1,             0.877
  15,   4081,      0,   0,             0.841
  15,   4081,      0,   1,             0.869
  15,   4081,      0,  -1,             0.876
  16,   4080,      0,   0,             0.988
  16,   4080,      0,   1,              0.99
  16,   4080,      0,  -1,             0.989
  17,   4079,      0,   0,             0.978
  17,   4079,      0,   1,             0.981
  17,   4079,      0,  -1,              0.98
  18,   4078,      0,   0,             0.981
  18,   4078,      0,   1,              0.98
  18,   4078,      0,  -1,             0.985
  19,   4077,      0,   0,             0.977
  19,   4077,      0,   1,             0.979
  19,   4077,      0,  -1,             0.986
  20,   4076,      0,   0,             0.977
  20,   4076,      0,   1,             0.986
  20,   4076,      0,  -1,             0.984
  21,   4075,      0,   0,             0.977
  21,   4075,      0,   1,             0.983
  21,   4075,      0,  -1,             0.988
  22,   4074,      0,   0,             0.983
  22,   4074,      0,   1,             0.994
  22,   4074,      0,  -1,             0.993
  23,   4073,      0,   0,              0.98
  23,   4073,      0,   1,             0.992
  23,   4073,      0,  -1,             0.995
  24,   4072,      0,   0,             0.989
  24,   4072,      0,   1,             0.989
  24,   4072,      0,  -1,             0.991
  25,   4071,      0,   0,              0.99
  25,   4071,      0,   1,             0.999
  25,   4071,      0,  -1,             0.996
  26,   4070,      0,   0,             0.993
  26,   4070,      0,   1,             0.995
  26,   4070,      0,  -1,             0.998
  27,   4069,      0,   0,             0.993
  27,   4069,      0,   1,             0.999
  27,   4069,      0,  -1,               1.0
  28,   4068,      0,   0,             0.997
  28,   4068,      0,   1,               1.0
  28,   4068,      0,  -1,             0.999
  29,   4067,      0,   0,             0.996
  29,   4067,      0,   1,             0.999
  29,   4067,      0,  -1,             0.999
  30,   4066,      0,   0,             0.991
  30,   4066,      0,   1,             1.001
  30,   4066,      0,  -1,             0.999
  31,   4065,      0,   0,             0.988
  31,   4065,      0,   1,             0.998
  31,   4065,      0,  -1,             0.998
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-15 13:08:52 -05:00
Noah Goldstein
7cbc03d030 x86: Remove memcmp-sse4.S 
Code didn't actually use any sse4 instructions since `ptest` was
removed in:

commit 2f9062d717
Author: Noah Goldstein <goldstein.w.n@gmail.com>
Date:   Wed Nov 10 16:18:56 2021 -0600

    x86: Shrink memcmp-sse4.S code size

The new memcmp-sse2 implementation is also faster.

geometric_mean(N=20) of page cross cases SSE2 / SSE4: 0.905

Note there are two regressions preferring SSE2 for Size = 1 and Size =
65.

Size = 1:
size, align0, align1, ret, New Time/Old Time
   1,      1,      1,   0,               1.2
   1,      1,      1,   1,             1.197
   1,      1,      1,  -1,               1.2

This is intentional. Size == 1 is significantly less hot based on
profiles of GCC11 and Python3 than sizes [4, 8] (which is made
hotter).

Python3 Size = 1        -> 13.64%
Python3 Size = [4, 8]   -> 60.92%

GCC11   Size = 1        ->  1.29%
GCC11   Size = [4, 8]   -> 33.86%

size, align0, align1, ret, New Time/Old Time
   4,      4,      4,   0,             0.622
   4,      4,      4,   1,             0.797
   4,      4,      4,  -1,             0.805
   5,      5,      5,   0,             0.623
   5,      5,      5,   1,             0.777
   5,      5,      5,  -1,             0.802
   6,      6,      6,   0,             0.625
   6,      6,      6,   1,             0.813
   6,      6,      6,  -1,             0.788
   7,      7,      7,   0,             0.625
   7,      7,      7,   1,             0.799
   7,      7,      7,  -1,             0.795
   8,      8,      8,   0,             0.625
   8,      8,      8,   1,             0.848
   8,      8,      8,  -1,             0.914
   9,      9,      9,   0,             0.625

Size = 65:
size, align0, align1, ret, New Time/Old Time
  65,      0,      0,   0,             1.103
  65,      0,      0,   1,             1.216
  65,      0,      0,  -1,             1.227
  65,     65,      0,   0,             1.091
  65,      0,     65,   1,              1.19
  65,     65,     65,  -1,             1.215

This is because A) the checks in range [65, 96] are now unrolled 2x
and B) because smaller values <= 16 are now given a hotter path. By
contrast the SSE4 version has a branch for Size = 80. The unrolled
version has get better performance for returns which need both
comparisons.

size, align0, align1, ret, New Time/Old Time
 128,      4,      8,   0,             0.858
 128,      4,      8,   1,             0.879
 128,      4,      8,  -1,             0.888

As well, out of microbenchmark environments that are not full
predictable the branch will have a real-cost.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-15 13:08:42 -05:00
Noah Goldstein
8804157ad9 x86: Optimize memcmp SSE2 in memcmp.S 
New code save size (-303 bytes) and has significantly better
performance.

geometric_mean(N=20) of page cross cases New / Original: 0.634
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-15 13:08:35 -05:00
Adhemerval Zanella
592b6d00aa stdio: Split __get_errname definition from errlist.c 
The loader does not need to pull all __get_errlist definitions
and its size is decreased:

Before:
$ size elf/ld.so
   text    data     bss     dec     hex filename
 197774   11024     456  209254   33166 elf/ld.so

After:
$ size elf/ld.so
   text    data     bss     dec     hex filename
 191510    9936     456  201902   314ae elf/ld.so

Checked on x86_64-linux-gnu.
 2022-04-15 09:37:57 -03:00
Noah Goldstein
26b2478322 x86: Reduce code size of mem{move|pcpy|cpy}-ssse3 
The goal is to remove most SSSE3 function as SSE4, AVX2, and EVEX are
generally preferable. memcpy/memmove is one exception where avoiding
unaligned loads with `palignr` is important for some targets.

This commit replaces memmove-ssse3 with a better optimized are lower
code footprint verion. As well it aliases memcpy to memmove.

Aside from this function all other SSSE3 functions should be safe to
remove.

The performance is not changed drastically although shows overall
improvements without any major regressions or gains.

bench-memcpy geometric_mean(N=50) New / Original: 0.957

bench-memcpy-random geometric_mean(N=50) New / Original: 0.912

bench-memcpy-large geometric_mean(N=50) New / Original: 0.892

Benchmarks where run on Zhaoxin KX-6840@2000MHz See attached numbers
for all results.

More important this saves 7246 bytes of code size in memmove an
additional 10741 bytes by reusing memmove code for memcpy (total 17987
bytes saves). As well an additional 896 bytes of rodata for the jump
table entries.
 2022-04-14 23:21:42 -05:00
Noah Goldstein
d85916e30a x86: Remove mem{move|cpy}-ssse3-back 
With SSE2, SSE4.1, AVX2, and EVEX versions very few targets prefer
SSSE3. As a result it is no longer worth it to keep the SSSE3
versions given the code size cost.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-14 23:21:42 -05:00
Noah Goldstein
41bfe224e5 x86: Remove str{p}{n}cpy-ssse3 
With SSE2, SSE4.1, AVX2, and EVEX versions very few targets prefer
SSSE3. As a result it is no longer worth it to keep the SSSE3
versions given the code size cost.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-14 23:21:42 -05:00
Noah Goldstein
e084ccd37e x86: Remove str{n}cat-ssse3 
With SSE2, SSE4.1, AVX2, and EVEX versions very few targets prefer
SSSE3. As a result it is no longer worth it to keep the SSSE3
versions given the code size cost.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-14 23:21:41 -05:00
Noah Goldstein
c024a0b9cf x86: Remove str{n}{case}cmp-ssse3 
With SSE2, SSE4.1, AVX2, and EVEX versions very few targets prefer
SSSE3. As a result it is no longer worth it to keep the SSSE3
versions given the code size cost.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-14 23:21:41 -05:00
Noah Goldstein
c725f408db x86: Remove {w}memcmp-ssse3 
With SSE2, SSE4.1, AVX2, and EVEX versions very few targets prefer
SSSE3. As a result it is no longer worth it to keep the SSSE3
versions given the code size cost.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
 2022-04-14 23:21:41 -05:00
Adhemerval Zanella
404656009b nptl: Handle spurious EINTR when thread cancellation is disabled (BZ#29029) 
Some Linux interfaces never restart after being interrupted by a signal
handler, regardless of the use of SA_RESTART [1].  It means that for
pthread cancellation, if the target thread disables cancellation with
pthread_setcancelstate and calls such interfaces (like poll or select),
it should not see spurious EINTR failures due the internal SIGCANCEL.

However recent changes made pthread_cancel to always sent the internal
signal, regardless of the target thread cancellation status or type.
To fix it, the previous semantic is restored, where the cancel signal
is only sent if the target thread has cancelation enabled in
asynchronous mode.

The cancel state and cancel type is moved back to cancelhandling
and atomic operation are used to synchronize between threads.  The
patch essentially revert the following commits:

  8c1c0aae20 nptl: Move cancel type out of cancelhandling
  2b51742531 nptl: Move cancel state out of cancelhandling
  26cfbb7162 nptl: Remove CANCELING_BITMASK

However I changed the atomic operation to follow the internal C11
semantic and removed the MACRO usage, it simplifies a bit the
resulting code (and removes another usage of the old atomic macros).

Checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu,
and powerpc64-linux-gnu.

[1] https://man7.org/linux/man-pages/man7/signal.7.html

Reviewed-by: Florian Weimer <fweimer@redhat.com>
Tested-by: Aurelien Jarno <aurelien@aurel32.net>
 2022-04-14 12:48:31 -03:00
Stefan Liebler
2376944b9e S390: Add new s390 platform z16. 
The new IBM z16 is added to platform string array.
The macro _DL_PLATFORMS_COUNT is incremented.

_dl_hwcaps_subdir is extended by "z16" if HWCAP_S390_VXRS_PDE2
is set. HWCAP_S390_NNPA is not tested in _dl_hwcaps_subdirs_active
as those instructions may be replaced or removed in future.

tst-glibc-hwcaps.c is extended in order to test z16 via new marker5.

A fatal glibc error is dumped if glibc was build with architecture
level set for z16, but run on an older machine. (See dl-hwcap-check.h)
 2022-04-14 10:37:45 +02:00
Noah Goldstein
535e935a28 Replace {u}int_fast{16|32} with {u}int32_t 
On 32-bit machines this has no affect. On 64-bit machines
{u}int_fast{16|32} are set as {u}int64_t which is often not
ideal. Particularly x86_64 this change both saves code size and
may save instruction cost.

Full xcheck passes on x86_64.
 2022-04-13 21:23:04 -05:00
Samuel Thibault
45a8e05785 hurd: Define ELIBEXEC 
So we can implement it in the exec server.
 2022-04-12 22:16:40 +02:00
Szabolcs Nagy
707efc2955 Remove _dl_skip_args_internal declaration 
It does not seem to be used.

Reviewed-by: Florian Weimer <fweimer@redhat.com>
 2022-04-12 14:42:26 +01:00
Tom Coldrick
d2265570a7 manual: Avoid name collision in libm ULP table [BZ #28956] 
The 32-bit and 64-bit variants of RISC-V share the same name - "RISC-V"
- when generating the libm error table for the info pages. This
collision, and the way how the table is generated, mean that the values
in the final table for "RISC-V" may be either for the 32- or 64-bit
variant, with no indication as to which.

As an additional side-effect, this makes the build non-reproducible, as
the error table generated is dependent upon the host filesystem
implementation.

To solve this issue, the libm-test-ulps-name files for both variants
have been modified to include their word size, so as to remove the
collision and provide more accurate information in the table.

An alternative proposed was to merge the two variants' ULP values into a
single file, but this would mean that information about error values is
lost, as the two variants are not identical. Some differences are
considerable, notably the values for the exp() function are large.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
 2022-04-11 11:46:10 -04:00
Alan Modra
1a85970f41 powerpc: Relocate stinfo->main 
start_addresses in sysdeps/powerpc/powerpc64/start.S is historical
baggage that should disappear.  Until someone does that, relocating
stinfo->main by hand is one solution to the fact that the field may be
unrelocated at the time it is accessed.  This is similar to what is
done for dynamic tags via the D_PTR macro.  stinfo->init and
stinfo->fini are zero in both powerpc64/start.S and powerpc32/start.S,
so make it a little more obvious they are unused by passing NULLs to
LIBC_START_MAIN.  The makefile change is needed to pick up
elf/dl-static-tls.h from dl-machine.h.

Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
 2022-04-10 08:37:38 +09:30
Alan Modra
31a9bc8c55 powerpc64: Set up thread register for _dl_relocate_static_pie 
libgcc ifunc resolvers that access hwcap via a field in the tcb can't
be called until the thread pointer is set up.  Other ifunc resolvers
might need access to at_platform.  This patch sets up a fake thread
pointer early to a copy of tcbhead_t.  hwcapinfo.c already had local
variables for hwcap and at_platform, replace them with an entire
tcbhead_t.  It's not that large and this way we easily ensure hwcap
and at_platform are at the same relative offsets as they are in the
real thread block.

The patch also conditionally disables part of tst-tlsifunc-static,
"bar address read from IFUNC resolver is incorrect".  We can't get a
proper address for a thread variable before glibc initialises tls.

Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
 2022-04-10 08:33:40 +09:30
Alan Modra
d6efcc118e powerpc64: Use medium model toc accesses throughout 
The PowerPC64 linker edits medium model toc-indirect code to toc-pointer
relative:
	addis r9,r2,tc_entry_for_var@toc@ha
	ld r9,tc_entry_for_var@toc@l(r9)
becomes
	addis r9,r2,(var-.TOC.)@ha
	addi r9,r9,(var-.TOC.)@l
when "var" is known to be local to the binary.  This isn't done for
small-model toc-indirect code, because "var" is almost guaranteed to
be too far away from .TOC. for a 16-bit signed offset.  And, because
the analysis of which .toc entry can be removed becomes much more
complicated in objects that mix code models, they aren't removed if
any small-model toc sequence appears in an object file.

Unfortunately, glibc's build of ld.so smashes the needed objects
together in a ld -r linking stage.  This means the GOT/TOC is left
with a whole lot of relative relocations which is untidy, but in
itself is not a serious problem.  However, static-pie on powerpc64
bombs due to a segfault caused by one of the small-model accesses
before _dl_relocate_static_pie.  (The very first one in rcrt1.o
passing start_addresses in r8 to __libc_start_main.)

So this patch makes all the toc/got accesses in assembly medium code
model, and a couple of functions hidden.  By itself this is not
enough to give us working static-pie, but it is useful in isolation to
enable better linker optimisation.

There's a serious problem in libgcc too.  libgcc ifuncs access the
AT_HWCAP words stored in the tcb with an offset from the thread
pointer (r13), but r13 isn't set at the time _dl_relocate_static_pie.
A followup patch will fix that.

Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
 2022-04-10 08:33:06 +09:30
Alan Modra
30afd8c44d linux: Constify rfv variable in dl_vdso_vsym 
Compilers may decide to put the rfv variable in .data rather than on
the stack.  It's slightly better to put it in .data.rel.ro.local
instead.  Regardles of that, making it const may enable further
optimisations.  Found when examining relative relocations (GOT ones
in particular) as part of enabling static-pie for PowerPC64.
 2022-04-10 08:33:02 +09:30