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fe66db99f49e...
Samuel Thibault
hurd tls: update comment about fields at the end of tcbhead
fe49a73316ed...
Florian Weimer
x86: Avoid single-argument _Static_assert in <tls.h>
Older GCC versions do not support this extension.  Fixes commit f1bdee61797
("x86 tls: Use _Static_assert for TLS access size assertion").
fcb78a55058f...
Adhemerval Zanella
linux: Consolidate INLINE_SYSCALL
With all Linux ABIs using the expected Linux kABI to indicate
syscalls errors, there is no need to replicate the INLINE_SYSCALL.

The generic Linux sysdep.h includes errno.h even for !__ASSEMBLER__,
which is ok now and it allows cleanup some archaic code that assume
otherwise.

Checked with a build against all affected ABIs.
fa00db0a6eb7...
Florian Weimer
resolv: Fix ABA race in /etc/resolv.conf change detection [BZ #25420]
__resolv_conf_get_current should only record the initial file
change data if after verifying that file just read matches the
original measurement.  Fixes commit aef16cc8a4c670036d45590877
("resolv: Automatically reload a changed /etc/resolv.conf file
[BZ #984]").

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
f6a9b6b08ea0...
Alistair Francis
tst-clone3: Use __NR_futex_time64 if we don't have __NR_futex
We can't include sysdep.h in the test case (it introduces lots of
strange failures) so __NR_futex isn't redifined to __NR_futex_time64 by
64-bit time_t 32-bit archs (y2038 safe).

To allow the test to pass let's just do the __NR_futex_time64 syscall if
we don't have __NR_futex defined.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
f640c4231df5...
Samuel Thibault
htl: Remove stub warning for pthread_mutexattr_setpshared
It actually is implemented.
f1bdee617975...
Samuel Thibault
x86 tls: Use _Static_assert for TLS access size assertion
edba4e5f91ee...
Samuel Thibault
htl: Link internal htl tests against libpthread
ebb4aed873de...
Adhemerval Zanella
mips64: Consolidate Linux sysdep.h
The mips64 Linux syscall macros only differs argument type and
the requirement of sign-extending values on n32.  The headers
are consolidate by parameterizing the arguments with a new type,
__syscall_arg_t, and by defining the ARGIFY for n64.

Also, the generic unix mips64 sysdep is essentially the same,
only the load instruction need to be adjusted depending of the
ABI.

Checked on mips64-linux-gnu and mips64n32-linux-gnu.
e26b8a008ae6...
Adhemerval Zanella
powerpc: Use Linux kABI for syscall return
It changes the powerpc INTERNAL_VSYSCALL_CALL and INTERNAL_SYSCALL_NCS
to return a negative value instead of the returning the CR value in
the 'err' macro argument.

The macro INTERNAL_SYSCALL_DECL is no longer required, and the
INTERNAL_SYSCALL_ERROR_P macro follows the other Linux kABIs.

Checked on powerpc64-linux-gnu, powerpc64le-linux-gnu, and
powerpc-linux-gnu-power4.
dd0b4df329ff...
Florian Weimer
resolv: Enhance __resolv_conf_load to capture file change data
The data is captured after reading the file.  This allows callers
to check the change data against an earlier measurement.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
d1aea2805df2...
Adhemerval Zanella
nptl: Remove ununsed pthread-errnos.h rule
cf1e05f5990a...
Adhemerval Zanella
mips: Use Linux kABI for syscall return
It changes the mips INTERNAL_SYSCALL* and internal_syscall*  macros
to return a negative value instead of the 'a3' register value on then
'err' macro argument.

The macro INTERNAL_SYSCALL_DECL is no longer required, and the
INTERNAL_SYSCALL_ERROR_P macro follows the other Linux kABIs.
The redefinition of INTERNAL_VSYSCALL_CALL is also no longer
required.

Checked on mips64-linux-gnu, mips64n32-linux-gnu, and mips-linux-gnu.
cd72a13f22db...
Adhemerval Zanella
powerpc: Consolidate Linux syscall definition
The diferences between powerpc64{le} and powerpc32 Linux sysdep.h
are:

  1. On both vDSO and syscall macros the volatile registers r9, r10,
    r11, and r12 are used as input operands on powerpc32 and as
    clobber registers on powerpc64.  However the outcome is essentially
    the same, it advertise the register might be clobbered by the
    kernel (although Linux won't leak register information to userland
    in such case).

  2. The LOADARGS* macros uses a different size to check for invalid
    types.

  3. The pointer mangling support guard pointer loading uses ABI
    specific instruction and register.

This patch consolidates on only one sysdep by using the the powerpc64
version as default and add the adjustments required for powerpc32.

Checked on powerpc64-linux-gnu, powerpc64le-linux-gnu, and
powerpc-linux-gnu-power4.
ca843defbcbd...
Samuel Thibault
htl: Only check pthread_self coherency when DEBUG is set
htl has been widely tested for a long time now with this coherency
checked successfully.
c76147afe917...
Florian Weimer
elf: Extract _dl_sym_post, _dl_sym_find_caller_map from elf/dl-sym.c
The definitions are moved into a new file, elf/dl-sym-post.h, so that
this code can be used by the dynamic loader as well.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
c624d23260d5...
Tulio Magno Quites Machado Filho
Add a generic scalb implementation
This is a preparatory patch to enable building a _Float128
variant to ease reuse when building a _Float128 variant to
alias this long double only symbol.

Notably, stubs are added where missing to the native _Float128
sysdep dir to prevent building these newly templated variants
created inside the build directories.

Also noteworthy are the changes around LIBM_SVID_COMPAT.  These
changes are not intuitive.  The templated version is only
enabled when !LIBM_SVID_COMPAT, and the compat version is
predicated entirely on LIBM_SVID_COMPAT.  Thus, exactly one is
stubbed out entirely when building.  The nldbl scalb compat
files are updated to account for this.

Likewise, fixup the reuse of m68k's e_scalb{f,l}.c to include
it's override of e_scalb.c.  Otherwise, the search path finds
the templated copy in the build directory.  This could be
futher simplified by providing an overridden template, but I
lack the hardware to verify.
c261718b3fda...
Adhemerval Zanella
sparc: Avoid clobbering register parameters in syscall
The sparc INTERNAL_SYSCALL macro might clobber the register
parameter if the argument itself might clobber any register (a function
call for instance).

This patch fixes it by using temporary variables for the expressions
between the register assignments (as indicated by GCC documentation,
6.47.5.2 Specifying Registers for Local Variables).

It is similar to the fix done for MIPS (bug 25523).

Checked on sparc64-linux-gnu and sparcv9-linux-gnu.
be74b42ee2a9...
Adhemerval Zanella
riscv: Avoid clobbering register parameters in syscall
The riscv INTERNAL_SYSCALL macro might clobber the register
parameter if the argument itself might clobber any register (a function
call for instance).

This patch fixes it by using temporary variables for the expressions
between the register assignments (as indicated by GCC documentation,
6.47.5.2 Specifying Registers for Local Variables).

It is similar to the fix done for MIPS (bug 25523).

Checked with riscv64-linux-gnu-rv64imafdc-lp64d build.
bc2eb9321ec0...
Adhemerval Zanella
linux: Remove INTERNAL_SYSCALL_DECL
With all Linux ABIs using the expected Linux kABI to indicate
syscalls errors, the INTERNAL_SYSCALL_DECL is an empty declaration
on all ports.

This patch removes the 'err' argument on INTERNAL_SYSCALL* macro
and remove the INTERNAL_SYSCALL_DECL usage.

Checked with a build against all affected ABIs.
b65a82e4e757...
Samuel Thibault
hurd: Add THREAD_GET/SETMEM/_NC
Store them in the TCB, and use them for accessing _hurd_sigstate.
ad180676b83d...
Joseph Myers
Adjust thresholds in Bessel function implementations (bug 14469).
A recent discussion in bug 14469 notes that a threshold in float
Bessel function implementations, used to determine when to use a
simpler implementation approach, results in substantially inaccurate
results.

As I discussed in
<https://sourceware.org/ml/libc-alpha/2013-03/msg00345.html>, a
heuristic argument suggests 2^(S+P) as the right order of magnitude
for a suitable threshold, where S is the number of significand bits in
the floating-point type and P is the number of significant bits in the
representation of the floating-point type, and the float and ldbl-96
implementations use thresholds that are too small.  Some threshold
does need using, there or elsewhere in the implementation, to avoid
spurious underflow and overflow for large arguments.

This patch sets the thresholds in the affected implementations to more
heuristically justifiable values.  Results will still be inaccurate
close to zeroes of the functions (thus this patch does *not* fix any
of the bugs for Bessel function inaccuracy); fixing that would require
a different implementation approach, likely along the lines described
in <http://www.cl.cam.ac.uk/~jrh13/papers/bessel.ps.gz>.

So the justification for a change such as this would be statistical
rather than based on particular tests that had excessive errors and no
longer do so (no doubt such tests could be found, but would probably
be too fragile to add to the testsuite, as liable to give large errors
again from very small implementation changes or even from compiler
changes).  See
<https://sourceware.org/ml/libc-alpha/2020-02/msg00638.html> for such
statistics of the resulting improvements for float functions.

Tested (glibc testsuite) for x86_64.
abcc039d2e26...
Florian Weimer
elf: Introduce the rtld-stubbed-symbols makefile variable
This generalizes a mechanism used for stack-protector support, so
that it can be applied to other symbols if required.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
a803367bab16...
Florian Weimer
powerpc64: Add memory protection key support [BZ #23202]
The 32-bit protection key behavior is somewhat unclear on 32-bit powerpc,
so this change is restricted to the 64-bit variants.

Flag translation is needed because of hardware differences between the
POWER implementation (read and write flags) and the Intel implementation
(write and read+write flags).
a25077a43175...
Samuel Thibault
pthread: Move robust mutex tests from nptl to sysdeps/pthread
tst-robust8.c prints some mutex internals for nptl debugging, this
needed to be made conditioned by getting built with nptl.
a1a20f029299...
Florian Weimer
resolv: Fix file handle leak in __resolv_conf_load [BZ #25429]
res_vinit_1 did not close the stream on errors, only on success.
This change moves closing the stream to __resolv_conf_load, for both
the success and error cases.

Fixes commit 89f187a40fc0ad4e22838526bfe34d73f758b776 ("resolv: Use
getline for configuration file reading in res_vinit_1") and commit
3f853f22c87f0b671c0366eb290919719fa56c0e ("resolv: Lift domain search
list limits [BZ #19569] [BZ #21475]"), where memory allocation was
introduced into res_vinit_1.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
9c7a58347b37...
Andreas Schwab
arm: fix use of INTERNAL_SYSCALL_CALL
Remove extra argument from INTERNAL_SYSCALL_CALL macro call.  Fixes
commit bc2eb9321e ("linux: Remove INTERNAL_SYSCALL_DECL").
9a973da61777...
Adhemerval Zanella
s390: Consolidate Linux syscall definition
The {INTERNAL,INLINE}_SYSCALL are defined only on s390 sysdep.h.

Checked on s390x-linux-gnu and s390-linux-gnu.
975ace4eca49...
Adhemerval Zanella
alpha: Refactor syscall and Use Linux kABI for syscall return
It highly unlikely that alpha will be ported to anything else than
Linux, so this patch moves the generic unix syscall definition to
Linux and adapt it to Linux kernel ABI.

It changes the internal_syscall* macros to return a negative value
instead of the '$19' register value on the 'err' macro argument.

The macro INTERNAL_SYSCALL_DECL is no longer required, and the
INTERNAL_SYSCALL_ERROR_P macro follows the other Linux kABIs.

Checked on alpha-linux-gnu.
9642b85fd0df...
Florian Weimer
resolv: Use <file_change_detection.h> in __resolv_conf_get_current
Only minor functional changes (i.e., regarding the handling of
directories, which are now treated as empty files).

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
86c5d2cf0ce0...
Adhemerval Zanella
sparc: Use Linux kABI for syscall return
It changes the sparc internal_syscall* macros to return a negative
value instead of the 'g1' register value in the 'err' macro argument.
The __SYSCALL_STRING macro is also changed to no set the 'g1'
value, since 'o1' already holds all the required information
to check if syscall has failed.

The macro INTERNAL_SYSCALL_DECL is no longer required, and the
INTERNAL_SYSCALL_ERROR_P macro follows the other Linux kABIs.
The redefinition of INTERNAL_VSYSCALL_CALL is also no longer
required.

Checked on sparc64-linux-gnu and sparcv9-linux-gnu. It fixes
the sporadic issues on sparc32 where clock_nanosleep does not
act as cancellation entrypoint.
861be5fd6601...
Adhemerval Zanella
nios2: Use Linux kABI for syscall return
It changes the nios INTERNAL_SYSCALL_RAW macro to return a negative
value instead of the 'r2' register value on the 'err' macro argument.

The macro INTERNAL_SYSCALL_DECL is no longer required, and the
INTERNAL_SYSCALL_ERROR_P macro follows the other Linux kABIs.

Checked with a build against nios2-linux-gnu.
6cc8fc7c1506...
Adhemerval Zanella
microblaze: Avoid clobbering register parameters in syscall
The microblaze INTERNAL_SYSCALL macro might clobber the register
parameter if the argument itself might clobber any register (a function
call for instance).

This patch fixes it by using temporary variables for the expressions
between the register assignments (as indicated by GCC documentation,
6.47.5.2 Specifying Registers for Local Variables).

It is similar to the fix done for MIPS (bug 25523).

Checked with microblaze-linux-gnu and microblazeel-linux-gnu build.
6c43d94a96a1...
Samuel Thibault
htl: Add missing functions and defines for robust mutexes
5d844e1b7251...
H.J. Lu
i386: Enable CET support in ucontext functions
1. getcontext and swapcontext are updated to save the caller's shadow
stack pointer and return address.
2. setcontext and swapcontext are updated to restore shadow stack and
jump to new context directly.
3. makecontext is updated to allocate a new shadow stack and set the
caller's return address to the helper code, L(exitcode).
4. Since we no longer save and restore EAX, ECX and EDX in getcontext,
setcontext and swapcontext, we can use them as scratch register slots
to enable CET in ucontext functions.

Since makecontext allocates a new shadow stack when making a new
context and kernel allocates a new shadow stack for clone/fork/vfork
syscalls, we track the current shadow stack base.  In setcontext and
swapcontext, if the target shadow stack base is the same as the current
shadow stack base, we unwind the shadow stack.  Otherwise it is a stack
switch and we look for a restore token.

We enable shadow stack at run-time only if program and all used shared
objects, including dlopened ones, are shadow stack enabled, which means
that they must be compiled with GCC 8 or above and glibc 2.28 or above.
We need to save and restore shadow stack only if shadow stack is enabled.
When caller of getcontext, setcontext, swapcontext and makecontext is
compiled with smaller ucontext_t, shadow stack won't be enabled at
run-time.  We check if shadow stack is enabled before accessing the
extended field in ucontext_t.

Tested on i386 CET/non-CET machines.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
3a0ecccb599a...
Florian Weimer
ld.so: Do not export free/calloc/malloc/realloc functions [BZ #25486]
Exporting functions and relying on symbol interposition from libc.so
makes the choice of implementation dependent on DT_NEEDED order, which
is not what some compiler drivers expect.

This commit replaces one magic mechanism (symbol interposition) with
another one (preprocessor-/compiler-based redirection).  This makes
the hand-over from the minimal malloc to the full malloc more
explicit.

Removing the ABI symbols is backwards-compatible because libc.so is
always in scope, and the dynamic loader will find the malloc-related
symbols there since commit f0b2132b35248c1f4a80f62a2c38cddcc802aa8c
("ld.so: Support moving versioned symbols between sonames
[BZ #24741]").

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
2efa52c880d4...
Florian Weimer
Remove weak declaration of free from <inline-hashtab.h>
elf/dl-minimal.c provides a definition of free, so the function
pointer is always non-null, even before the final relocation
of the loader.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
2b7dc93f826e...
Tulio Magno Quites Machado Filho
ldbl-128ibm-compat: Provide a scalb implementation
Reuse the template in order to provide the redirect for
scalbl to __scalbieee128, but avoid any extra aliasing
as this is intended to support long double redirects only.
157252e9edc8...
Adhemerval Zanella
ia64: Use Linux kABI for syscall return
It changes the ia64 INTERNAL_SYSCALL_NCS macro to return a negative
value instead of the 'r10' register value on the 'err' macro argument.

The macro INTERNAL_SYSCALL_DECL is no longer required, and the
INTERNAL_SYSCALL_ERROR_P macro follows the other Linux kABIs.

Checked on ia64-linux-gnu.
0cbc855acb17...
Samuel Thibault
pthread: Fix building tst-robust8 with nptl
NPTL's pthreadP.h needs internal definitions
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