This patch introduces loop exit function, which also
restores guest CPU state according to the value of host
program counter.
Reviewed-by: NAurelien Jarno <aurelien@aurel32.net>
Signed-off-by: NPavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Message-Id: <20150710095702.13280.97477.stgit@PASHA-ISP>
Signed-off-by: NRichard Henderson <rth@twiddle.net>

After commit 626cf8f4 (icount: set can_do_io outside TB execution,
2014-12-08), can_do_io is set to 1 if not executing code.  It is
no longer necessary to make this assumption in cpu_can_do_io.

It is also possible to remove the use_icount test, simply by
never setting cpu->can_do_io to 0 unless use_icount is true.

With these changes cpu_can_do_io boils down to a read of
cpu->can_do_io.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Instead of invalidating an original TB in cpu_exec_nocache()
prematurely, just save a link to it in the temporary generated TB. If
cpu_io_recompile() is raised subsequently from the temporary TB,
invalidate the original one as well. That allows reusing the original TB
each time cpu_exec_nocache() is called to handle expired instruction
counter in icount mode.
Signed-off-by: NSergey Fedorov <serge.fdrv@gmail.com>
Message-Id: <1435656909-29116-1-git-send-email-serge.fdrv@gmail.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Remove un-needed usages of ENV_GET_CPU() by converting the APIs to use
CPUState pointers and retrieving the env_ptr as minimally needed.

Scripted conversion for target-* change:

for I in target-*/cpu.h; do
    sed -i \
    's/\(^int cpu_[^_]*_exec(\)[^ ][^ ]* \*s);$/\1CPUState *cpu);/' \
    $I;
done
Signed-off-by: NPeter Crosthwaite <crosthwaite.peter@gmail.com>
Signed-off-by: NAndreas Färber <afaerber@suse.de>

This is one of very few things in exec-all with a genuine CPU
architecture dependency. Move these hashing helpers to a new
header to trim exec-all.h down to a near architecture-agnostic
header.

The defs are only used by cpu-exec and translate-all which are both
arch-obj's so the new tb-hash.h has no core code usage.
Reviewed-by: NRichard Henderson <rth@redhat.com>
Signed-off-by: NPeter Crosthwaite <crosthwaite.peter@gmail.com>
Message-Id: <9d048b96f7cfa64a4d9c0b88e0dd2877fac51d41.1433052532.git.crosthwaite.peter@gmail.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Note that even after this patch, most callers of address_space_*
functions must still be under the big QEMU lock, otherwise the memory
region returned by address_space_translate can disappear as soon as
address_space_translate returns.  This will be fixed in the next part
of this series.
Reviewed-by: NFam Zheng <famz@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

After the previous patch, TLBs will be flushed on every change to
the memory mapping.  This patch augments that with synchronization
of the MemoryRegionSections referred to in the iotlb array.

With this change, it is guaranteed that iotlb_to_region will access
the correct memory map, even once the TLB will be accessed outside
the BQL.
Reviewed-by: NFam Zheng <famz@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

This for now is a simple TLB flush.  This can change later for two
reasons:

1) an AddressSpaceDispatch will be cached in the CPUState object

2) it will not be possible to do tlb_flush once the TCG-generated code
runs outside the BQL.
Reviewed-by: NFam Zheng <famz@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Use MIN instead of an "if" statement.  Move "tb" assignment where
the value is actually used.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

All uses of TB inside cpu_exec are dominated by "tb = tb_find_fast(env)",
and there are no uses after the switch statement.  So the assignment
is dead, as reported by Coverity.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

With the introduction of QEMU_CLOCK_VIRTUAL_RT, the computation of
sc->diff_clk can be simplified nicely:

        qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) -
        qemu_clock_get_ns(QEMU_CLOCK_REALTIME) +
        cpu_get_clock_offset()

     =  qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) -
        (qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - cpu_get_clock_offset())

     =  qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) -
        (qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + timers_state.cpu_clock_offset)

     =  qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) -
        qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL_RT)

Cc: Sebastian Tanase <sebastian.tanase@openwide.fr>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

sc->diff_clk is already equal to sleep_delay (split in a second and a
nanosecond part).  If you subtract sleep_delay - rem_delay, the result
is exactly rem_delay.

Cc: Sebastian Tanase <sebastian.tanase@openwide.fr>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

In this case, QEMU might longjmp out of cpu-exec.c and miss the final
cleanup in cpu_exec_nocache.  Do this manually through a new compile
flag.
Signed-off-by: NPavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

This patch sets can_do_io function to allow reading icount
within cpu-exec, but outside TB execution.
Signed-off-by: NPavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Exception index is reset at every entry at every entry into cpu_exec()
function. This may cause missing the exceptions while replaying them.
This patch moves exception_index reset to the locations where they are
processed.
Signed-off-by: NPavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

In icount mode cpu_exec_nocache function is used to execute part of the
existing TB. At the end of cpu_exec_nocache newly created TB is deleted.
Sometimes io_read function needs to recompile current TB and restart TB
lookup and execution. After that tb_find_fast function finds old (bigger)
TB again. This TB cannot be executed (because icount is not big enough)
and cpu_exec_nocache is called again. Such a loop continues over and over.
This patch deletes old TB and avoids finding it in the TB cache.
Signed-off-by: NPavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

The signal is currently checked by 10 targets, but only actually
raised by Sparc and ARM.  For the sake of one test-and-branch,
we can handle this generic bit generically.
Signed-off-by: NRichard Henderson <rth@twiddle.net>
Message-id: 1410626734-3804-24-git-send-email-rth@twiddle.net
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Signed-off-by: NRichard Henderson <rth@twiddle.net>
Message-id: 1410626734-3804-23-git-send-email-rth@twiddle.net
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Cc: qemu-ppc@nongnu.org
Signed-off-by: NRichard Henderson <rth@twiddle.net>
Message-id: 1410626734-3804-22-git-send-email-rth@twiddle.net
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Cc: Michael Walle <michael@walle.cc>
Signed-off-by: NRichard Henderson <rth@twiddle.net>
Acked-by: NMichael Walle <michael@walle.cc>
Message-id: 1410626734-3804-21-git-send-email-rth@twiddle.net
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Cc: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Signed-off-by: NRichard Henderson <rth@twiddle.net>
Message-id: 1410626734-3804-20-git-send-email-rth@twiddle.net
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Cc: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: NRichard Henderson <rth@twiddle.net>
Reviewed-by: NLeon Alrae <leon.alrae@imgtec.com>
Tested-by: NLeon Alrae <leon.alrae@imgtec.com>
Message-id: 1410626734-3804-19-git-send-email-rth@twiddle.net
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

It can go back in when it actually does something.

Cc: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Signed-off-by: NRichard Henderson <rth@twiddle.net>
Reviewed-by: NBastian Koppelmann <kbastian@mail.uni-paderborn.de>
Message-id: 1410626734-3804-18-git-send-email-rth@twiddle.net
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Cc: Jia Liu <proljc@gmail.com>
Signed-off-by: NRichard Henderson <rth@twiddle.net>
Tested-by: NJia Liu <proljc@gmail.com>
Message-id: 1410626734-3804-17-git-send-email-rth@twiddle.net
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Cc: Blue Swirl <blauwirbel@gmail.com>
Signed-off-by: NRichard Henderson <rth@twiddle.net>
Message-id: 1410626734-3804-16-git-send-email-rth@twiddle.net
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Cc: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: NRichard Henderson <rth@twiddle.net>
Message-id: 1410626734-3804-15-git-send-email-rth@twiddle.net
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Signed-off-by: NRichard Henderson <rth@twiddle.net>
Message-id: 1410626734-3804-14-git-send-email-rth@twiddle.net
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Cc: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: NRichard Henderson <rth@twiddle.net>
Message-id: 1410626734-3804-13-git-send-email-rth@twiddle.net
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Signed-off-by: NRichard Henderson <rth@twiddle.net>
Message-id: 1410626734-3804-12-git-send-email-rth@twiddle.net
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Cc: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Signed-off-by: NRichard Henderson <rth@twiddle.net>
Reviewed-by: NEdgar E. Iglesias <edgar.iglesias@xilinx.com>
Message-id: 1410626734-3804-11-git-send-email-rth@twiddle.net
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Since do_interrupt_m68k_hardirq is no longer used outside
op_helper.c, make it static.
Signed-off-by: NRichard Henderson <rth@twiddle.net>
Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
Message-id: 1410626734-3804-10-git-send-email-rth@twiddle.net
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Cc: Alexander Graf <agraf@suse.de>
Signed-off-by: NRichard Henderson <rth@twiddle.net>
Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
Message-id: 1410626734-3804-9-git-send-email-rth@twiddle.net
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Cc: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: NRichard Henderson <rth@twiddle.net>
Reviewed-by: NMax Filippov <jcmvbkbc@gmail.com>
Message-id: 1410626734-3804-8-git-send-email-rth@twiddle.net
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Continuing the removal of ifdefs from cpu_exec.

Cc: Andreas Färber <afaerber@suse.de>
Signed-off-by: NRichard Henderson <rth@twiddle.net>
Reviewed-by: NMax Filippov <jcmvbkbc@gmail.com>
Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
Message-id: 1410626734-3804-7-git-send-email-rth@twiddle.net
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Cc: qemu-ppc@nongnu.org
Signed-off-by: NRichard Henderson <rth@twiddle.net>
Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
Message-id: 1410626734-3804-6-git-send-email-rth@twiddle.net
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Signed-off-by: NRichard Henderson <rth@twiddle.net>
Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
Message-id: 1410626734-3804-5-git-send-email-rth@twiddle.net
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Note that the code that was within the "exit" ifdef block
was identical to the cpu_compute_eflags inline, so make that
simplification at the same time.
Signed-off-by: NRichard Henderson <rth@twiddle.net>
Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
Message-id: 1410626734-3804-4-git-send-email-rth@twiddle.net
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Around the cpu_exec_enter/exit hooks contain many empty
ifdef blocks.  Delete all of these to highlight those
targets for which we actually need to do work.
Signed-off-by: NRichard Henderson <rth@twiddle.net>
Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
Message-id: 1410626734-3804-3-git-send-email-rth@twiddle.net
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

In preparation for removing a bunch of ifdefs from cpu_exec.

Cc: Andreas Färber <afaerber@suse.de>
Signed-off-by: NRichard Henderson <rth@twiddle.net>
Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
Message-id: 1410626734-3804-2-git-send-email-rth@twiddle.net
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Make the debug_excp_handler target specific hook into a QOM
CPU method.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>