Zygote: Restrict slave mountspace so Dalvik apps can mount system-wide volumes

Android 4.2 implements multi-user storage using per-process mount
namespaces.  Originally, everything under "/" (the entire filesystem
hierarchy) is marked as a recursive-slave mountspace for all zygote
instances.  This is done so that user-storage sandbox mounts under
/storage/emulated are hidden from other apps and users.

Unfortunately this means that any Dalvik app (actually, any program whose
clone/fork ancestry includes a Dalvik zygote, which is everything except
services spawned directly from init) cannot mount system-wide volumes.
Thus, apps like CifsManager are effectively broken in Android 4.2, since
its cifs mounts are only visible to the CifsManager app itself.  All other
apps see empty mountpoints instead of the mounted volume.  Furthermore,
Linux provides no provision for a process to "escape" a recursive-slave
mountspace in versions prior to Linux 3.8 (setns syscall).

Here, we restrict the slave mountspace to /storage (and, due to a possible
kernel bug, /mnt/shell/emulated) so that Dalvik apps can mount system-wide
volumes elsewhere (with appropriate permission, as in earlier versions of
Android), while retaining full multi-user storage compatibility.

This change requires that a tmpfs volume is mounted as /storage in init.rc.
If this volume is unavailable, then Zygote falls back to the previous
behavior of marking the entire filesystem hierarchy as slave.  It also
implicitly requires that EMULATED_STORAGE_TARGET is path-prefixed by (part
of the subhierarchy of) ANDROID_STORAGE, which is the typical case.
DexOpt anything in /system on /cache

Allow system property to disable use of /cache for dexfiles.
Revert "DexOpt anything in /system on /cache"

This reverts commit d1144fc6b4ba1172e6b7532e4c325a10b70a460b.
[MIPS] Fixing FP registers fs0 and fs1 corruption bug.

For performance reasons, we don't want to use "callee saved" FP registers.
The fix is to just use temporary FP registers instead.

Change-Id: Ifae20c707ff7022905a080892348bfbc151e4935
Signed-off-by: Douglas Leung <douglas@mips.com>
[MIPS] Fix several profiling issues caused by incorrect register saves

rTEMP is used by the JAL and JALR macros so it needs to be preserved
if it is holding some other useful value. No need to save ra in rTEMP
if using JAL/JALR macros.

Change-Id: I1bf8c3b044faa944021b4331e0a71c1489b70241
Signed-off-by: Douglas Leung <douglas@mips.com>
Signed-off-by: Chris Dearman <chris@mips.com>
[MIPS] Fix DDMS(profiling) bug.

Change-Id: I47e87d600dc6eb529bf1ae9c8cc2b81910b9513c
Signed-off-by: Douglas Leung <douglas@mips.com>
remove duplicated call to dvmJitCalleeSave()

Change-Id: Ib7b5f637a22fd5ba60bdb45cd34ac8c1781c7bd3
Signed-off-by: Rocky Zhang <zhangyan.hit@gmail.com>
Use ALOGE rather than SLOGE for mountEmulatedStorage failures.

Otherwise the actual failure isn't in logcat, and all you see there
is the rather confusing:

  E dalvikvm: cannot mountExternalStorage(): Success

Change-Id: I10c96748b5ff5b6c3877312e7bdb2641026b4489
Remove dvmFindInterfaceMethodInCache2.

We can just use dvmFindInterfaceMethodInCache directly.

Change-Id: I2f3a660262ba7a39c05689df160ebdd2e7ec38a5
Don't cache failures in the interface cache.

If we try to reuse a failure, we'll be holding a NULL Method* without
the current thread having the appropriate exception pending, which will
lead to a SIGSEGV.

I've added a corresponding vm-test to cts/.

Bug: http://code.google.com/p/android/issues/detail?id=29358
Change-Id: I044e438c46fce256c8eff2dac5d86778734d5614
ExceptionInInitializerError should wrap only non Error exceptions.

Backport from dalvik-dev, due to customer demand.

Bug: http://code.google.com/p/android/issues/detail?id=41196
Change-Id: I53ef57e54983f2173546463ac78e265ff5dd3284
Fix handling of annotations whose classes are missing at runtime.

Bug: http://code.google.com/p/android/issues/detail?id=39854
Change-Id: I3089b693ff3084b093f991f991ac9273dea7356d
Possible leak in dvmAllocRegion

In error case mmapped ptr 'base' is not munmapped.

Change-Id: I9e43841371fee6b7c092fe9a8922ae82e78805ed
Fail if the new index is out of range.

We were silently truncating, which made an obvious problem
into a non-obvious one.

Bug: http://code.google.com/p/android/issues/detail?id=40409
Change-Id: I15576357c72ac0e98cf85c0a1d289fd5009468f9
Remove dead code.

Change-Id: I56c27c510c8fc0ba2d8e691c788b433dce250f7a
Reclaiming attribute obj after pthread_create

call pthread_attr_destroy in order to reclaim attribute object.

Change-Id: I2592903ef67101a7c656a3ab0ad243a9716298b5
Remove possilbe leaks in dalvik.

Add missing free() calls.

Change-Id: Id602b84ba8f15fef1851f37e3d5aac214ac67de1
Optimize opcodes to avoid bubble in pipeline.

Possible bubbles between fetch(ldr) and extract(and)
Excute subsequent instruction(s) inbetween the bubble by reordering instruction.

Change-Id: I76d89ed6bc4ca44673231375cc529fdbfd5a8030
Optimize dvmHash Loops.

pHashTable->tableSize is working as volatile variable & is evaluated on every iteration.
Help compiler to define tableSize as local(Register) variable.

Change-Id: Iecdea3ecb810319d461ff3924ef21fd6c2d69d1e
Change NewDirectByteBuffer to allow NULL if capacity == 0.

Also make the diagnostics more uniform.

Bug: 7892060
Change-Id: Ib3ca0d6241a5958d2c8681337b1883fc3d74cb54