Some of the s390-specific configure checks are using compile and
link configure tests. Now use only compile tests as the link
tests fails when e.g. bootstrapping a cross-toolchain due to
missing crt-files/libc.so. This is achieved by using
AC_COMPILE_IFELSE in configure.ac file.
This is observable e.g. when using buildroot which builds glibc
only once or the build-many-glibcs.py script. Note that the latter
one is building glibc twice in the compilers-step (configure-checks
fails) and in the glibcs-step (configure-checks succeed).
Note, that the s390 specific configure tests for static PIE have to
link an executable to test binutils support. Thus we can't fix
those tests.
The __hurd_fail () inline function is the dedicated, idiomatic way of
reporting errors in the Hurd part of glibc. Not only is it more concise
than '{ errno = err; return -1; }', it is since commit
6639cc1002
"hurd: Mark error functions as __COLD" marked with the cold attribute,
telling the compiler that this codepath is unlikely to be executed.
In one case, use __hurd_dfail () over the plain __hurd_fail ().
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-Id: <20230520115531.3911877-1-bugaevc@gmail.com>
Create a private hidden __hurd_thread_self alias, and use that one.
Fixes 2f8ecb58a5
"hurd: Fix x86_64 _hurd_tls_fork" and
c7fcce38c8
"hurd: Make sure to not use tcb->self"
Reported-by: Joseph Myers <joseph@codesourcery.com>
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Linux 6.3 adds six HWCAP2_SME* constants for AArch64; add them to the
corresponding bits/hwcap.h in glibc.
Tested with build-many-glibcs.py for aarch64-linux-gnu.
strlen, which is another ifunc-selected function, is invoked during
early static executable startup if the argv arrives from the exec
server. Make it not crash.
Checked on x86_64-gnu: statically linked executables launched after the
exec server is up now start up successfully.
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-Id: <20230517191436.73636-10-bugaevc@gmail.com>
On x86_64, we have to pass function arguments in registers, not on the
stack. We also have to align the stack pointer in a specific way. Since
sharing the logic with i386 does not bring much benefit, split the file
back into i386- and x86_64-specific versions, and fix the x86_64 version
to set up the thread properly.
Bonus: i386 keeps doing the extra RPC inside __thread_set_pcsptp to
fetch the state of the thread before setting it; but x86_64 no lnoger
does that.
Checked on x86_64-gnu and i686-gnu.
Fixes be6d002ca2
"hurd: Set up the basic tree for x86_64-gnu"
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-Id: <20230517191436.73636-9-bugaevc@gmail.com>
It is illegal to call thread_get_state () on mach_thread_self (), so
this codepath cannot be used as-is to fork the calling thread's TLS.
Fortunately we can use THREAD_SELF (aka %fs:0x0) to find out the value
of our fs_base without calling into the kernel.
Fixes: f6cf701efc
"hurd: Implement TLS for x86_64"
Checked on x86_64-gnu: fork () now works!
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-Id: <20230517191436.73636-8-bugaevc@gmail.com>
Unlike sigstate->thread, tcb->self did not hold a Mach port reference on
the thread port it names. This means that the port can be deallocated,
and the name reused for something else, without anyone noticing. Using
tcb->self will then lead to port use-after-free.
Fortunately nothing was accessing tcb->self, other than it being
intially set to then-valid thread port name upon TCB initialization. To
assert that this keeps being the case without altering TCB layout,
rename self -> self_do_not_use, and stop initializing it.
Also, do not (re-)allocate a whole separate and unused stack for the
main thread, and just exit __pthread_setup early in this case.
Found upon attempting to use tcb->self and getting unexpected crashes.
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-Id: <20230517191436.73636-7-bugaevc@gmail.com>
...instead of mach_setup_thread (), which is unsuitable for setting up
function calls.
Checked on x86_64-gnu: the signal thread no longer crashes upon trying
to process a message.
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-Id: <20230517191436.73636-6-bugaevc@gmail.com>
The existing two macros, MACHINE_THREAD_STATE_SET_PC and
MACHINE_THREAD_STATE_SET_SP, can be used to set program counter and the
stack pointer registers in a machine-specific thread state structure.
Useful as it is, this may not be enough to set up the thread to make a
function call, because the machine-specific ABI may impose additional
requirements. In particular, x86_64 ABI requires that upon function
entry, the stack pointer is 8 less than 16-byte aligned (sp & 15 == 8).
To deal with this, introduce a new macro,
MACHINE_THREAD_STATE_SETUP_CALL (), which sets both stack and
instruction pointers, and also applies any machine-specific requirements
to make a valid function call. The default implementation simply
forwards to MACHINE_THREAD_STATE_SET_PC and MACHINE_THREAD_STATE_SET_SP,
but on x86_64 we additionally align the stack pointer.
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-Id: <20230517191436.73636-3-bugaevc@gmail.com>
This hasn't caused any problems yet but we are passing a pointer to struct
task_thread_times_info which can cause problems if we populate over the
existing size of the struct.
Message-Id: <ZGRDDNcOM2hA3CuT@jupiter.tail36e24.ts.net>
This patch updates the kernel version in the tests tst-mman-consts.py,
tst-mount-consts.py and tst-pidfd-consts.py to 6.3. (There are no new
constants covered by these tests in 6.3 that need any other header
changes.)
Tested with build-many-glibcs.py.
So I was able to reproduce the hangs in the original source, and debug
it, and fix it. In doing so, I realized that we can't use anything
complex to trigger the thread because that "anything" might also cause
the expected segfault and force everything out of sync again.
Here's what I ended up with, and it doesn't seem to hang where the
original one hung quite often (in a tight while..end loop). The key
changes are:
1. Calls to futex are error checked, with retries, to ensure that the
futexes are actually doing what they're supposed to be doing. In the
original code, nearly every futex call returned an error.
2. The main loop has checks for whether the thread ran or not, and
"unlocks" the thread if it didn't (this is how the original source
hangs).
Note: the usleep() is not for timing purposes, but just to give the
kernel an excuse to run the other thread at that time. The test will
not hang without it, but is more likely to test the right bugfix
if the usleep() is present.
The real i386_thread_state Mach structure has an alignment of 8 on
x86_64. However, in struct sigcontext, the compiler was packing sc_gs
(which is the first member of sc_i386_thread_state) into the same 8-byte
slot as sc_error; this resulted in the rest of sc_i386_thread_state
members having wrong offsets relative to each other, and the overall
sc_i386_thread_state layout mismatching that of i386_thread_state.
Fix this by explicitly adding the required padding members, and
statically asserting that this results in the desired alignment.
The same goes for sc_i386_float_state.
Checked on x86_64-gnu.
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-Id: <20230515083323.1358039-4-bugaevc@gmail.com>
sizeof (*stackframe) appears to be divisible by 16, but we should not
rely on that. So make sure to leave enough space for the stackframe
first, and then align the final pointer at 16 bytes.
Checked on x86_64-gnu.
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-Id: <20230515083323.1358039-3-bugaevc@gmail.com>
Fixes 60f9bf9746
"hurd: Port trampoline.c to x86_64"
Checked on x86_64-gnu.
Reported-by: Bruno Haible <bruno@clisp.org>
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-Id: <20230515083323.1358039-2-bugaevc@gmail.com>
Reflow Makefile.
Sort using scripts/sort-makefile-lines.py.
No code generation changes observed in binary artifacts.
No regressions on x86_64 and i686.
Linux 6.3 has no new syscalls. Update the version number in
syscall-names.list to reflect that it is still current for 6.3.
Tested with build-many-glibcs.py.
While mach/kern_return.h happens to pull mach/machine/kern_return.h,
mach/machine/boolean.h, and mach/machine/vm_types.h (and realpath-ing them
exposes the machine-specific machine symlink content), those headers do not
actually define anything machine-specific for the content of errno.h.
So we can just rule out these machine-specific from the dependency
comment.
We already did the same change for Hurd
(https://git.savannah.gnu.org/cgit/hurd/hurd.git/commit/?id=ef5924402864ef049f40a39e73967628583bc1a4)
Due to MiG requiring the subsystem to be defined early in order to know the
size of a port, this was causing a division by zero error during ./configure.
We could have just move subsystem to the top of the snippet, however it is
simpler to just remove the check given that we have no plans to use some other
MiG anyway.
HAVE_MIG_RETCODE is removed completely since this will be a no-op either
way (compiling against old Hurd headers will work the same, new Hurd
headers will result in the same stubs since retcode is a no-op).
Message-Id: <ZFspor91aoMwbh9T@jupiter.tail36e24.ts.net>
This patch redirects the error functions to the appropriate
longdouble variants which enables the compiler to optimize
for the abi ieeelongdouble.
Signed-off-by: Sachin Monga <smonga@linux.ibm.com>
Reflow all long lines adding comment terminators.
Sort all reflowed text using scripts/sort-makefile-lines.py.
No code generation changes observed in binary artifacts.
No regressions on x86_64 and i686.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Summary of changes:
- Use BAD_TYPECHECK to perform type checking in a cleaner way.
BAD_TYPECHECK is moved into sysdeps/mach/rpc.h to avoid duplication.
- Remove assertions for mach_msg_type_t since those won't work for
x86_64.
- Update message structs to use mach_msg_type_t directly.
- Use designated initializers.
Message-Id: <ZFa+roan3ioo0ONM@jupiter.tail36e24.ts.net>
Summary of the changes:
- Update msg_align to use ALIGN_UP like we have done in previous
patches. Use it below whenever necessary to avoid repeating the same
alignment logic.
- Define BAD_TYPECHECK to make it easier to do type checking in a few
places below.
- Update io2mach_type to use designated initializers.
- Make RetCodeType use mach_msg_type_t. mach_msg_type_t is 8 byte for
x86_64, so this make it portable.
- Also call msg_align for _IOT_COUNT2/_IOT_TYPE2 since it is more
correct.
Message-Id: <ZFMvVsuFKwIy2dUS@jupiter.tail36e24.ts.net>
arm_sve.h depends on stdint.h but that relies on libc headers unless
compiled in freestanding mode. Without this change a bootstrap glibc
build (that uses a compiler without installed libc headers) failed with
checking for availability of SVE ACLE... In file included from [...]/arm_sve.h:28,
from conftest.c:1:
[...]/stdint.h:9:16: fatal error: stdint.h: No such file or directory
9 | # include_next <stdint.h>
| ^~~~~~~~~~
compilation terminated.
configure: error: mathvec is enabled but compiler does not have SVE ACLE. [...]
This patch enables libmvec on AArch64. The proposed change is mainly
implementing build infrastructure to add the new routines to ABI,
tests and benchmarks. I have demonstrated how this all fits together
by adding implementations for vector cos, in both single and double
precision, targeting both Advanced SIMD and SVE.
The implementations of the routines themselves are just loops over the
scalar routine from libm for now, as we are more concerned with
getting the plumbing right at this point. We plan to contribute vector
routines from the Arm Optimized Routines repo that are compliant with
requirements described in the libmvec wiki.
Building libmvec requires minimum GCC 10 for SVE ACLE. To avoid raising
the minimum GCC by such a big jump, we allow users to disable libmvec
if their compiler is too old.
Note that at this point users have to manually call the vector math
functions. This seems to be acceptable to some downstream users.
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
dev_t are 64bit on Linux ports, so better increase their size on 64bit
Hurd. It happens that this helps with BZ 23084 there: st_dev has type fsid_t
(quad) and is specified by POSIX to have type dev_t. Making dev_t 64bit
makes these match.
The standards want msg_lspid/msg_lrpid/shm_cpid/shm_lpid to be pid_t, see BZ
23083 and 23085.
We can leave them __rpc_pid_t on i386 for ABI compatibility, but avoid
hitting the issue on 64bit.
The standards want uid/cuid to be uid_t, gid/cgid to be gid_t and mode to be
mode_t, see BZ 23082.
We can leave them short ints on i386 for ABI compatibility, but avoid
hitting the issue on 64bit.
bits/ipc.h ends up being exactly the same in sysdeps/gnu/ and
sysdeps/unix/sysv/linux/, so remove the latter.
The standards want l_type and l_whence to be short ints, see BZ 23081.
We can leave them ints on i386 for ABI compatibility, but avoid hitting the
issue on 64bit.
These were created by creating stub files, running 'make update-abi',
and reviewing the results.
Also, set baseline ABI to GLIBC_2.38, the (upcoming) first glibc
release to first have x86_64-gnu support.
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
