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accordingly.
Instead of manually calling cpu_x86_set_cpl() when the CPL changes,
check for CPL changes on calls to cpu_x86_load_seg_cache(R_CS). Every
location that called cpu_x86_set_cpl() also called
cpu_x86_load_seg_cache(R_CS), so cpu_x86_set_cpl() is no longer
required.
This fixes the SMM handler code as it was not setting/restoring the
CPL level manually.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Implementations of system calls getrusage and wait4 have not previously
handled correctly cases when incorrect address of struct rusage is
passed.
This change makes sure return values are correctly set for these cases.
Signed-off-by: Petar Jovanovic <petar.jovanovic@imgtec.com>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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The ARM kernel has chosen to spill into the HWCAP2 ELF feature bit flags
early, even though it hasn't yet exhausted all 32 bits of the HWCAP word.
Add support for setting this in the same way we do for HWCAP.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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The ARM target-specific code in elfload.c was incorrectly allowing
the 64-bit ARM target to use most of the existing 32-bit definitions:
most noticably this meant that our HWCAP bits passed to the guest
were wrong, and register handling when dumping core was totally
broken. Fix this by properly separating the 64 and 32 bit code,
since they have more differences than similarities.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Cc: qemu-stable@nongnu.org
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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The kernel has added support for a number of new ARM HWCAP bits;
add them to QEMU, including support for setting them where we have
a corresponding CPU feature bit.
We were also incorrectly setting the VFPv3D16 HWCAP -- this means
"only 16 D registers", not "supports 16-bit floating point format";
since QEMU always has 32 D registers for VFPv3, we can just remove
the line that incorrectly set this bit.
The kernel does not set the HWCAP_FPA even if it is providing FPA
emulation via nwfpe, so don't set this bit in QEMU either.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Cc: qemu-stable@nongnu.org
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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The ELF HWCAP bits for ARM features THUMBEE, NEON, VFPv3 and VFPv3D16 are
all off by one compared to the kernel definitions. Fix this discrepancy
and add in the missing CRUNCH bit which was the cause of the off-by-one
error. (We don't emulate any of the CPUs which have that weird hardware,
so it's otherwise uninteresting to us.)
Cc: qemu-stable@nongnu.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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--enable-uname-release was a rather heavyweight hammer, as it allows
providing values less that UNAME_MINIMUM_RELEASE. Also, it affects
all built linux-user targets, which in most cases is not what user
wants.
Now that we have UNAME_MINIMUM_RELEASE for all linux-user platforms,
we can drop --enable-uname-release and the related CONFIG_UNAME_RELEASE
define.
Users can still override the variable with QEMU_UNAME=2.6.32 or -r
command line option. If distributors need to update a minimum version
for a specific target, it can be done by updating UNAME_MINIMUM_RELEASE.
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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Make syscall.c slightly smaller by moving uname-related
functions to uname.c.
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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To move more uname related functions out of syscall.c,
rename cpu-uname.{c,h} to uname.{c.h}
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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Set the fault address correctly in the signal information passed
to a signal handler for AArch64 guests.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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target_sigevent struct
Use the public sigset_t instead of the glibc specific internal
__sigset_t in _syscall.
Calculate the sigevent pad size is calculated in similar way as kernel
does it instead of using glibc internal field _pad.
This is needed for building with musl libc.
Signed-off-by: Natanael Copa <ncopa@alpinelinux.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
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Recently merged kernel ports (such as OpenRISC and Meta) have an llseek
system call instead of _llseek. This is handled for the host
architecture by defining __NR__llseek as __NR_llseek, but not for the
target architecture.
Handle it in the same way for these architectures, defining
TARGET_NR__llseek as TARGET_NR_llseek.
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Riku Voipio <riku.voipio@iki.fi>
Cc: Jia Liu <proljc@gmail.com>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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Signed-off-by: Huw Davies <huw@codeweavers.com>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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This makes adding more message types cleaner.
Signed-off-by: Huw Davies <huw@codeweavers.com>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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Assert that the amount of stack space used for auxvec, envp & argv
exactly matches the amount allocated. This catches if DLINFO_ITEMS isn't
updated when another NEW_AUX_ENT is added.
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Riku Voipio <riku.voipio@iki.fi>
Cc: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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QEMU already supports /proc/self/{maps,stat,auxv} so addition of
/proc/self/exe is rather trivial.
Fixes https://bugs.launchpad.net/qemu/+bug/1299190
Signed-off-by: Maxim Ostapenko <m.ostapenko@partner.samsung.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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For AArch32 exceptions, the only information provided about
the cause of an exception is the individual exception type (data
abort, undef, etc), which we store in cs->exception_index. For
AArch64, the CPU provides much more detail about the cause of
the exception, which can be found in the syndrome register.
Create a set of fields in CPUARMState which must be filled in
whenever an exception is raised, so that exception entry can
correctly fill in the syndrome register for the guest.
This includes the information which in AArch32 appears in
the DFAR and IFAR (fault address registers) and the DFSR
and IFSR (fault status registers) for data aborts and
prefetch aborts, since if we end up taking the MMU fault
to AArch64 rather than AArch32 this will need to end up
in different system registers.
This patch does a refactoring which moves the setting of the
AArch32 DFAR/DFSR/IFAR/IFSR from the point where the exception
is raised to the point where it is taken. (This is no change
for cores with an MMU, retains the existing clearly incorrect
behaviour for ARM946 of trashing the MP access permissions
registers which share the c5_data and c5_insn state fields,
and has no effect for v7M because we don't implement its
MPU fault status or address registers.)
As a side effect of the cleanup we fix a bug in the AArch64
linux-user mode code where we were passing a 64 bit fault
address through the 32 bit c6_data/c6_insn fields: it now
goes via the always-64-bit exception.vaddress.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
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Flags NONBLOCK and CLOEXEC can have different values on the host and the
guest, so set correct host values before calling accept4().
This fixes several issues with accept4 system call and user-mode of QEMU.
Signed-off-by: Petar Jovanovic <petar.jovanovic@imgtec.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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Signed-off-by: Prasad Joshi <prasadjoshi.linux@gmail.com>
Acked-by: Riku Voipio <riku.voipio@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
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Commit a07c67dfccb1 (Implement AT_CLKTCK.) back in March 2008 added a
new auxvec entry but didn't increment DLINFO_ITEMS, so it's been out of
sync ever since.
Bump it up to 14 so that it matches the number of NEW_AUX_ENT's that
need to be counted in create_elf_tables().
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Riku Voipio <riku.voipio@iki.fi>
Cc: Paul Brook <paul@codesourcery.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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Older kernel headers don't define _LINUX_CAPABILITY_VERSION_1.
Switch to using the older _LINUX_CAPABILITY_VERSION; newer headers
still define this for source compatibility.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reported-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Reviewed-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Acked-by: Riku Voipio <riku.voipio@iki.fi>
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Implement the capget and capset syscalls. This is useful because
simple programs like 'ls' try to use it in AArch64, and otherwise
we emit a lot of noise about it being unimplemented.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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Don't allow the linux-user guest to block SIGSEGV -- QEMU needs this
signal to detect accesses to pages which it has marked read-only
because it has cached translated code from them.
We implement this by making the do_sigprocmask() wrapper suppress
SIGSEGV when doing the host process signal mask manipulation; instead
we store the current state of SIGSEGV in the TaskState struct.
If we get a SIGSEGV for the guest when the guest has blocked the
signal, we treat it as if the default SEGV handler was in place,
as the kernel does for forced SIGSEGV delivery.
This patch is based on an idea by Alex Barcelo, but rather than
simply lying to the guest about the SIGSEGV state we track it.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reported-by: Alex Barcelo <abarcelo@ac.upc.edu>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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Create a wrapper for signal mask changes initiated by the guest;
(this includes syscalls and also the sigreturns from signal.c)
this will give us a place to put code which prevents the guest
from changing the handling of signals used by QEMU itself
internally.
The wrapper is called from all the guest-initiated sigprocmask, but
is not called from internal qemu sigprocmask calls.
Signed-off-by: Alex Barcelo <abarcelo@ac.upc.edu>
[PMM: Added calls to wrapper for sigprocmask uses in signal.c
when setting the signal mask on entry and exit from signal
handlers, since these also are guest-provided signal masks.]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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AArch64 Linux, unlike AArch32, doesn't use a commpage. This means we
should not be reserving room in the guest address space for one.
Fixes LP:1287195.
Reported-by: Amanieu d'Antras <amanieu@gmail.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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F_GETOWN is replaced by F_GETOWN_EX inside the glibc fcntl wrapper
Signed-off-by: Andreas Schwab <schwab@suse.de>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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QEMU's implementation of the m68k atomic_barrier syscall, like the kernel's,
is just a no-op. However we still need to return a result code from it.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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The error path in AArch64 do_rt_sigreturn() which fails before
attempting lock_user_struct() was doing an unlock_user_struct()
on an uninitialized variable. Initialize frame to NULL so we
can use the same error-exit path in all cases (unlock of NULL
is permitted and does nothing).
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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Signed-off-by: Andreas Färber <afaerber@suse.de>
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Use CPUState. Allows to clean up CPUArchState in gdbstub.
Signed-off-by: Andreas Färber <afaerber@suse.de>
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Use CPUState. This lets us drop a few local env usages.
Signed-off-by: Andreas Färber <afaerber@suse.de>
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Most targets were using offsetof(CPUFooState, breakpoints) to determine
how much of CPUFooState to clear on reset. Use the next field after
CPU_COMMON instead, if any, or sizeof(CPUFooState) otherwise.
Signed-off-by: Andreas Färber <afaerber@suse.de>
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Signed-off-by: Andreas Färber <afaerber@suse.de>
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Signed-off-by: Andreas Färber <afaerber@suse.de>
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Signed-off-by: Andreas Färber <afaerber@suse.de>
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* remotes/riku/linux-user-for-upstream:
linux-user: set minimum kernel version to 2.6.32
linux-user: correct handling of break exception for MIPS
linux-user: translate signal number on return from sigtimedwait
linux-user: Implement sendmmsg syscall
linux-user: Fix getresuid, getresgid if !USE_UID16
linux-user: Don't use UID16 on AArch64
linux-user: AArch64: Implement SA_RESTORER for signal handlers
linux-user/signal.c: Fix AArch64 big-endian FP register restore
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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Popular glibc based distributions[1] require minimum
2.6.32 as kernel version. For some targets 2.6.18
would be enough, but dropping so low would mean some
suboptimal system calls could get used.
Set the minimum kernel advertized to 2.6.32 for
all architectures but aarch64 to ensure working qemu
linux-user in case host kernel is older.
[1] https://bugs.launchpad.net/ubuntu/+source/eglibc/+bug/921078
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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This patch adds the Store Quadword Conditionl (stqcx.) instruction
which is introduced in Power ISA 2.07.
Signed-off-by: Tom Musta <tommusta@gmail.com>
[agraf: fix compile error when !TARGET_PPC64]
Signed-off-by: Alexander Graf <agraf@suse.de>
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Exception with break instruction has not been correctly propagated as
SIGTRAP. This resolves crash issues with examples that use break
instruction on MIPS.
Signed-off-by: Petar Jovanovic <petar.jovanovic@imgtec.com>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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On success, sigtimedwait() returns a signal number that needs to be
translated from a host value to a target value.
This change also fixes issues with sigwait (that is implemented using
sigtimedwait()).
Signed-off-by: Petar Jovanovic <petar.jovanovic@imgtec.com>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
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Glibc when built for newer kernels assumes that the sendmmsg syscall is
available. Without it, dns resolution simply fails to work.
Wrap the syscall with existing infrastructure so that we don't have a host
dependency on sendmmsg.
To avoid locking the same area of guest memory twice (which will break if
DEBUG_REMAP is defined) we pull the lock/unlock part of do_sendrecvmsg()
out into its own function so the actual implementation can be shared.
Signed-off-by: Alexander Graf <agraf@suse.de>
[PMM: add recvmmsg support;
handle errors (which also implies support for non-blocking operations);
cap the vector length as the kernel implementation does;
don't lock guest memory twice;
support MSG_WAITFORONE flag]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
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The size of the UID/GID types depends on whether USE_UID16 is
defined. Define a new put_user_id() which writes a uid/gid
type to guest memory. This fixes getresuid and getresgid, which
were always storing 16 bits even if the uid type was 32 bits.
Reported-by: Michael Matz <matz@suse.de>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Reviewed-by: Richard Henderson <rth@twiddle.net>
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The AArch64 kernel defines its __kernel_uid_t type as 32 bits, unlike
32 bit ARM, so don't enable our 16-bit UID wrapper handling.
Signed-off-by: Andreas Schwab <schwab@suse.de>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
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Implement support for signal handlers with the SA_RESTORER
flag set.
Signed-off-by: Michael Matz <matz@suse.de>
[PMM: minor tweaks to make patch apply to current master]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
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Fix the loop restoring the FP registers from the signal frame to match
the one used when setting up the signal frame, so that it handles
TARGET_WORDS_BIGENDIAN being set.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
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'remotes/pmaydell/tags/pull-target-arm-20140220' into staging
target-arm queue:
* Fix a bug causing an assertion in the NVIC on ARMv7M models
* More A64 Neon instructions
* Refactor cpreg API to separate out access check functions, as
groundwork for AArch64 system mode
* Fix bug in linux-user A64 store-exclusive of XZR
# gpg: Signature made Thu 20 Feb 2014 11:12:57 GMT using RSA key ID 14360CDE
# gpg: Good signature from "Peter Maydell <peter.maydell@linaro.org>"
* remotes/pmaydell/tags/pull-target-arm-20140220: (30 commits)
linux-user: AArch64: Fix exclusive store of the zero register
target-arm: A64: Implement unprivileged load/store
target-arm: A64: Implement narrowing three-reg-diff operations
target-arm: A64: Implement the wide 3-reg-different operations
target-arm: A64: Add most remaining three-reg-diff widening ops
target-arm: A64: Add opcode comments to disas_simd_three_reg_diff
target-arm: A64: Implement store-exclusive for system mode
target-arm: Fix incorrect type for value argument to write_raw_cp_reg
target-arm: Remove failure status return from read/write_raw_cp_reg
target-arm: Remove unnecessary code now read/write fns can't fail
target-arm: Drop success/fail return from cpreg read and write functions
target-arm: Convert miscellaneous reginfo structs to accessfn
target-arm: Convert generic timer reginfo to accessfn
target-arm: Convert performance monitor reginfo to accessfn
target-arm: Split cpreg access checks out from read/write functions
target-arm: Stop underdecoding ARM946 PRBS registers
target-arm: Log bad system register accesses with LOG_UNIMP
target-arm: Remove unused ARMCPUState sr substruct
target-arm: Restrict check_ap() use of S and R bits to v6 and earlier
target-arm: Define names for SCTLR bits
...
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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Signed-off-by: Janne Grunau <j@jannau.net>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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Fix two issues in error handling in target_to_host_semarray():
* don't leak the host_array buffer if lock_user fails
* return an error if malloc() fails
v2: added missing * -Riku Voipio
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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Signed-off-by: Andreas Färber <afaerber@suse.de>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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In lock_iovec() if lock_user() failed we were doing an unlock_user
but not a free(vec), which is the wrong way round. We were also
assuming that free() and unlock_user() don't touch errno, which
is not guaranteed. Fix both these problems.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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