case. Otherwise, linking of clang and other llvm based executables
would complain about missing symbols.
Reported by: rstone
MFC after: 1 month
X-MFC-With: r353358
This change adds PowerPC64 support for minidumps on libkvm.
Address translation, page walk, and data retrieval were tested and seem to be
working correctly.
Reviewed by: jhibbits
Differential Revision: https://reviews.freebsd.org/D21555
to its successor in cases where examining a map entry requires a
helper like kvm_read_all. Use that method, with kvm_read_all, to fix
procstat_getfiles_kvm, which tries to find the successor now without
using such a helper. This addresses a problem introduced by r355491.
Reviewed by: markj (previous version)
Discussed with: kib
Differential Revision: https://reviews.freebsd.org/D22728
As mandated by POSIX. Also clarify the kill(2) manpage.
While there, restructure the code in killpg1() to use helper which
keeps overall state of the process list iteration in the killpg1_ctx
structued, later used to infer the error returned.
Reported by: amdmi3
Reviewed by: jilles
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Differential revision: https://reviews.freebsd.org/D22621
This is the half of the changes required that work as-is with both in-tree
ZFS and the new hotness, sysutils/openzfs. Highlights are less dependency
on header pollution (from somewhere) and using 'mnttab' instead of
'extmnttab'. In the in-tree ZFS, the latter is a #define for the former,
but in the port extmnttab is actually a distinct struct that's a super-set
of mnttab. We really want mnttab here anyways, so just use it.
Conditional branch and jump instructions do not always call via PLT
stubs and thus will not honor LD_PRELOAD, etc. lld warns about using
non-preemptible relocations for preemptible or unknown symbols whereas
bfd does not (at least for RISC-V).
Reviewed by: br, James Clarke
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D22658
This saves an instruction in each case as well as an extra memory
indirection via the GOT for PIC code.
Reviewed by: br, James Clarke
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D22656
o Remove All Rights Reserved from my notices
o imp@FreeBSD.org everywhere
o regularize punctiation, eliminate date ranges
o Make sure that it's clear that I don't claim All Rights reserved by listing
All Rights Reserved on same line as other copyright holders (but not
me). Other such holders are also listed last where it's clear.
The resizing could be a downsizing so some data would be lost and we
could attempt to read past the end of the new memory allocation.
MFC after: 2 weeks
Sponsored by: Panzura
This makes it possible to retrieve per-connection statistical
information such as the receive window size, RTT, or goodput,
using a newly added TCP_STATS getsockopt(3) option, and extract
them using the stats_voistat_fetch(3) API.
See the net/tcprtt port for an example consumer of this API.
Compared to the existing TCP_INFO system, the main differences
are that this mechanism is easy to extend without breaking ABI,
and provides statistical information instead of raw "snapshots"
of values at a given point in time. stats(3) is more generic
and can be used in both userland and the kernel.
Reviewed by: thj
Tested by: thj
Obtained from: Netflix
Relnotes: yes
Sponsored by: Klara Inc, Netflix
Differential Revision: https://reviews.freebsd.org/D20655
negative numbers (invoking undefined behavior)
Summary:
Various paths through hypot(x, y) will multiply x and y by a power of
two, perform the calculation in a range where IEEE-754 provides greater
precision, then undo the multiplication to determine the true result.
Undoing that multiplication is implemented as t1*w, where t1=2**k.
2**k is often computed by taking the high word of 1.0, then adding k<<20
(for doubles or long doubles) or k<<23 (for floats) to it, then
overwriting that high word. But when k is negative this left-shifts a
negative value -- and that's undefined behavior in many editions of C
and C++.
This patch should fix all hypot implementations to compute 2**k without
triggering this particular bit of undefined behavior.
Test Plan: I've only very lightly tested out the hypot(double, double)
change, in SpiderMonkey's JavaScript engine, for consistency with prior
behavior. The other functions' changes have more or less only been
eyeballed. Careful examination appreciated! Do note, however, that an
error in any of these changes would most likely produce a value that is
incorrect by a factor of two, so any mistake would most likely be
glaring if invoked.
Submitted by: Jeff Walden <jwalden@mit.edu>
Obtained from: https://github.com/freebsd/freebsd/pull/414
Reviewed by: dim, lwhsu
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D22354
Theoretically, this was breaking the size calculation for the symbol.
Noticed when doing a readthrough.
Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D22525
Summary:
Enable on powerpc64 and in lib/libclang_rt/Makefile change
MACHINE_CPUARCH to MACHINE_ARCH because on powerpc64
MACHINE_ARCH==MACHINE_CPUARCH so the 32-bit library overwrites 64-bit
library during installworld.
This patch doesn't enable any other libclang_rt libraries because they
need to be separately ported.
I have verified that games/julius (which fails on powerpc64 elfv2
without this change because of no libclang_rt profiling library) builds.
Test Plan: Ship it, test on powerpc and powerpcspe
Submitted by: pkubaj
Reviewed by: dim, jhibbits
Differential Revision: https://reviews.freebsd.org/D22425
MFC after: 1 month
X-MFC-With: r353358
Due to ELFv1 specific code in _ctx_start.S and makecontext.c, userspace
context switching was completely broken on ELFv2.
With this change, we now pass the libthr test suite.
Approved by: jhibbits (mentor)
Differential Revision: https://reviews.freebsd.org/D22421
Add ifdefs in the assembler for soft-float compile case.
Submitted by: Hiroki Mori
Reviewed by: ray@
Differential Review: https://reviews.freebsd.org/D22352
__has_attribute(__constructor__) is a better test for clang than
defined(__clang__). Switch to it instead.
While we're already here and touching it, pfg@ nailed down when GCC actually
introduced the priority argument -- 4.3. Use that instead of our
hammer-guess of GCC >= 5 for the sake of correctness.
The preproc logic was added at the last minute to appease GCC 4.2, and
kevans@ did clearly not go back and double-check that the logic worked out
for clang builds to use the new variant.
It turns out that clang defines __GNUC__ == 4. Flip it around and check
__clang__ as well, leaving a note to remove it later.
Reported by: cem
First, this commit is a NOP on GCC <= 4.x; this decidedly doesn't work
cleanly on GCC 4.2, and it will be gone soon anyways so I chose not to dump
time into figuring out if there's a way to make it work. xtoolchain-gcc,
clocking in as GCC6, can cope with it just fine and later versions are also
generally ok with the syntax. I suspect very few users are running GCC4.2
built worlds and also experiencing potential fallout from the status quo.
For dynamically linked applications, this change also means very little.
rtld will run libc ctors before most others, so the situation is
approximately a NOP for these as well.
The real cause for this change is statically linked applications doing
almost questionable things in their constructors. qemu-user-static, for
instance, creates a thread in a global constructor for their async rcu
callbacks. In general, this works in other places-
- On OpenBSD, __stack_chk_guard is stored in an .openbsd.randomdata section
that's initialized by the kernel in the static case, or ld.so in the
dynamic case
- On Linux, __stack_chk_guard is apparently stored in TLS and such a problem
is circumvented there because the value is presumed stable in the new
thread.
On FreeBSD, the rcu thread creation ctor and __guard_setup are both unmarked
priority. qemu-user-static spins up the rcu thread prior to __guard_setup
which starts making function calls- some of these are sprinkled with the
canary. In the middle of one of these functions, __guard_setup is invoked in
the main thread and __stack_chk_guard changes- qemu-user-static is promptly
terminated for an SSP violation that didn't actually happen.
This is not an all-too-common problem. We circumvent it here by giving the
__stack_chk_guard constructor a solid priority. 200 was chosen because that
gives static applications ample range (down to 101) for working around it
if they really need to. I suspect most applications will "just work" as
expected- the default/non-prioritized flavor of __constructor__ functions
run last, and the canary is generally not expected to change as of this
point at the very least.
This took approximately three weeks of spare time debugging to pin down.
PR: 241905
.jcr still needs a 0-entry added in crtend, even on !HAVE_CTORS archs, as
we're still getting .jcr sections added -- presumably due to the reference
in crtbegin. Without this terminal, the .jcr section (without data) overlaps
with the next section and register_classes in crtbegin will be examining the
wrong item.
PR: 241439
Reviewed by: andrew
Differential Revision: https://reviews.freebsd.org/D22132
Alter bsd.compat.mk to set MACHINE and MACHINE_ARCH when included
directly so MD paths in Makefiles work. In the process centralize
setting them in LIBCOMPATWMAKEENV.
Alter .PATH and CFLAGS settings in work when the Makefile is included.
While here only support LIB32 on supported platforms rather than always
enabling it and requiring users of MK_LIB32 to filter based
TARGET/MACHINE_ARCH.
The net effect of this change is to make Makefile.libcompat only build
compatability libraries.
Changes relative to r354449:
Correct detection of the compiler type when bsd.compat.mk is used
outside Makefile.libcompat. Previously it always matched the clang
case.
Set LDFLAGS including the linker emulation for mips where -m32 seems to
be insufficent.
Reviewed by: imp, kib (origional version in r354449)
Obtained from: CheriBSD (conceptually)
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D22251
