Rephrase code used in ARM sigreturn functions to avoid using
uninitialized variables. This fixes one genuine problem ('frame'
would not be initialized if we took the error-exit path because
our stackpointer was misaligned) and one which is clang being
alarmist (frame_addr wouldn't be initialized, though this is
harmless since unlock_user_struct ignores its second argument
in these cases; however since we don't generally make use of
this not-really-documented effect it's better avoided).
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1375095632-13735-3-git-send-email-peter.maydell@linaro.org
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Silence a clang warning in a PPC signal return function:
/home/petmay01/linaro/qemu-from-laptop/qemu/linux-user/signal.c:4611:9: error: variable 'sr_addr' is used
uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
if (!lock_user_struct(VERIFY_READ, sc, sc_addr, 1))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/petmay01/linaro/qemu-from-laptop/qemu/linux-user/signal.c:4636:28: note: uninitialized use occurs here
unlock_user_struct(sr, sr_addr, 1);
^~~~~~~
/home/petmay01/linaro/qemu-from-laptop/qemu/linux-user/qemu.h:442:27: note: expanded from macro 'unlock_user_struct'
unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0)
^
This happens when we unlock a user struct which we never
attempted to lock. Strictly, clang is actually wrong here -- it
hasn't been able to spot that unlock_user_struct() doesn't use
its second argument if the first is NULL. However it doesn't
seem too unreasonable to demand that we pass in initialized
values to it.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1375095632-13735-2-git-send-email-peter.maydell@linaro.org
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
When translating between host and target signal numbers keep negative
numbers unchanged, avoiding access beyond array bounds.
Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 878v2b8sek.fsf@igel.home
It no longer depends on CPUArchState, so move it to qom/cpu.c.
Prepares for changing GDBState::c_cpu to CPUState.
Signed-off-by: Andreas Färber <afaerber@suse.de>
The current ISA mode needs to be saved in bit 0 of the resume address.
If the current instruction happens to be in a branch delay slot, then
the address of the preceding jump instruction should be stored instead.
exception_resume_pc already does both of these tasks, so it is
made available and reused.
MIPS_HFLAG_BMASK in hflags is cleared, otherwise QEMU may treat the
first instruction of the signal handler as a delay slot instruction.
Signed-off-by: Kwok Cheung Yeung <kcy@codesourcery.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Processors supporting the MIPS16 or microMIPS ISAs set bit 0 in target
addresses to indicate that the target is written using a compressed ISA.
During signal handling, when jumping to or returning from a signal
handler, bit 0 of the destination PC is inspected and MIPS_HFLAG_M16 in
hflags cleared or set accordingly. Bit 0 of the PC is then cleared.
Signed-off-by: Kwok Cheung Yeung <kcy@codesourcery.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Deleting these first makes the next patch much easier to read.
This doesn't cause any sort of compilation failure because we
have not yet enabled n32/n64 compilation. This is dead code.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
* 'ppc-for-upstream' of git://repo.or.cz/qemu/agraf: (31 commits)
PPC: linux-user: Calculate context pointer explicitly
target-ppc: Error out for -cpu host on unknown PVR
target-ppc: Slim conversion of model definitions to QOM subclasses
PPC: Bring EPR support closer to reality
PPC: KVM: set has-idle in guest device tree
kvm: Update kernel headers
openpic: fix CTPR and de-assertion of interrupts
openpic: move IACK to its own function
openpic: IRQ_check: search the queue a word at a time
openpic: fix sense and priority bits
openpic: add some bounds checking for IRQ numbers
openpic: use standard bitmap operations
Revert "openpic: Accelerate pending irq search"
openpic: always call IRQ_check from IRQ_get_next
openpic/fsl: critical interrupts ignore mask before v4.1
openpic: make ctpr signed
openpic: rework critical interrupt support
openpic: make register names correspond better with hw docs
ppc/booke: fix crit/mcheck/debug exceptions
openpic: lower interrupt when reading the MSI register
...
Unconditional bswap replaced by __get_user/__put_user.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
Peter Maydell recommended the change to be more proper. The result was tested
and shows coming up with the same proper value.
Signed-off-by: Samuel Seay <LightningTH@GMail.com>
[agraf: change subject]
Signed-off-by: Alexander Graf <agraf@suse.de>
Removed h2g() macro around the ka->_sa_handler due to the _sa_handler being a
guest memory address.
Changed the __put_user to put_user as it was attempting to put a value at the
stack address but the new address is a guest memory address, __put_user is
for host memory addresses.
Signed-off-by: Samuel Seay <LightningTH@GMail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
[agraf: change subject line, reformat commit message]
Signed-off-by: Alexander Graf <agraf@suse.de>
Compare signal numbers in the proper domain.
Convert all of the fields for SIGIO and SIGCHLD.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This patch cleans up return sentences in the end of void functions.
Reported-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Amos Kong <akong@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
err was uninitialized, it's not OK to use |=. Spotted by Clang
compiler.
Fix by implementing the earlier statement which initializes the variable.
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
glibc 2.16 will remove the undocumented definition of 'struct siginfo'
from <bits/siginfo.h>.
This change is already present in glibc 2.15.90, so qemu compilation
of certain targets (eg. cris-user) breaks.
This struct was always typedef'd to be the same as 'siginfo_t' which
is what POSIX documents, so use that instead.
Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Don't use global variables directly but via accessor functions. Rename globals.
Convert macros to functions, add GCC format attributes.
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
All architectures work the same way, and all check for sas_ss_flags ==
0. The powerpc lines are wrong, and do the check the other way round
(it's a qemu internal check, which is done wrong only for this
architecture, it's more a typo than a bug). It's NOT ppc specific,
it's POSIX standard (sigaltstack) and qemu internal.
I have a test source that I will send in a follow-up (it's longer than
I would have wished, I'm sure that a better test case can be written
if needed)
Signed-off-by: Alex Barcelo <abarcelo@ac.upc.edu>
Signed-off-by: Alexander Graf <agraf@suse.de>
Scripted conversion:
for file in *.[hc] hw/*.[hc] hw/kvm/*.[hc] linux-user/*.[hc] linux-user/m68k/*.[hc] bsd-user/*.[hc] darwin-user/*.[hc] tcg/*/*.[hc] target-*/cpu.h; do
sed -i "s/CPUState/CPUArchState/g" $file
done
All occurrences of CPUArchState are expected to be replaced by QOM CPUState,
once all targets are QOM'ified and common fields have been extracted.
Signed-off-by: Andreas Färber <afaerber@suse.de>
Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
* it's -> its (fixed for all files)
* dont -> don't (only fixed in a line which was touched by the previous fix)
* distrub -> disturb (fixed in the same line)
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
sa_flags is uint32_t for mips{,n32,64}, so don't use tswapal().
edited by Riku Voipio: likewise on alpha
Reported-by: Khansa Butt <khansa@kics.edu.pk>
Suggested-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Cc: Ehsan Ul Haq <ehsan.ulhaq@kics.edu.pk>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
abi_(u)long might be different from target_ulong, so don't use tswapl
but introduce a new tswapal
Signed-off-by: Matthias Braun <matze@braunis.de>
Signed-off-by: Riku Voipio <riku.voipio@iki.fi>
This allows a more efficient representation for 64-bit hosts.
It should be about the same for 32-bit hosts, as we can still
access the individual pieces of the double.
Signed-off-by: Richard Henderson <rth@twiddle.net>
The code is unused since 8 years, so remove it.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
The ia64 sys/ucontext.h defines macros 'uc_link', 'uc_sigmask' and
'uc_stack'. Rename the s390 target_ucontext struct members to tuc_*,
bringing them into line with the other targets and fixing a compile
failure on ia64 hosts caused by this clash.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Remove fenab as it is only written, never used. Add a FIXME
comment about the discrepancy between our behaviour and that
of the Linux kernel for this routine.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@iki.fi>
Move the access of fpu_save into the commented out skeleton code for
restoring FPU registers on SPARC sigreturn, thus silencing a gcc
4.6 "variable set but never used" warning.
(This doesn't affect the calculation of 'err' because in fact
__get_user() can never fail.)
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@iki.fi>
Fixes crash in i386 when user emulation base address is non-zero.
21797 rt_sigreturn(8,1082124603,1,0,1082126048,1082126248)Exit reason and status: signal 11
Signed-off-by: Mike McCormack <mj.mccormack@samsung.com>
Signed-off-by: Riku Voipio <riku.voipio@iki.fi>
This patch removes all references to signal.h when qemu-common.h is included
as they become redundant.
Signed-off-by: Alexandre Raymond <cerbere@gmail.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
This patch adds support for running s390x binaries in the linux-user emulation
code.
Signed-off-by: Ulrich Hecht <uli@suse.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
Add uses of the float32/float64 boxing and unboxing macros so that
the ARM linux-user targets will compile with USE_SOFTFLOAT_STRUCT_TYPES
enabled.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Suppress a gcc array bounds overrun warning when filling in the SPARC
signal frame by adjusting our definition of the structure so that the
fp and callers_pc membes are part of the ins[] array rather than
separate fields; since qemu has no need to access the fields individually
there is no need to follow the kernel's structure field naming exactly.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
When invoking a signal handler for an ARM target, make sure the IT
bits in the CPSR are cleared. (This would otherwise cause incorrect
execution if the IT state was non-zero when an exception occured.
This bug has been masked previously because we weren't getting the
IT state bits at exception entry right anyway.)
Also use the proper cpsr_read()/cpsr_write() interface to update
the CPSR rather than manipulating CPUState fields directly.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Restore the VFP registers from the ucontext on return from a signal
handler in linux-user mode. This means that signal handlers cannot
accidentally corrupt the interrupted code's VFP state, and allows
them to deliberately modify the state via the ucontext structure.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@nokia.com>
For ARM linux-user mode signal handlers, fill in the ucontext with
VFP register contents in the same way that the kernel does. We only
do this for v2 format sigframe (2.6.12 and above); this is actually
bug-for-bug compatible with the older kernels, which don't save and
restore VFP registers either.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@nokia.com>
The padding in the target_ucontext_v2 is defined by the size of
the target's sigset_t type, not the host's. (This bug only causes
problems when we start using the uc_regspace[] array to expose
VFP registers to userspace signal handlers.)
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@nokia.com>
Rename the members of target_ucontext so that they don't conflict
with possible host macros for ucontext members. This has already
been done for the other targets.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Edgar E. Iglesias <edgar@axis.com>
There is disagreement between microblaze glibc and the kernel
to what the third arg of signal handlers should point to.
Change QEMU linux-user to match the kernel port. glibc patches
are pending.
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@petalogix.com>
