From 1b46093d33a0fa4d316d65288ef3b3ac5b77a4a2 Mon Sep 17 00:00:00 2001
From: Narayan Kamath <narayan@google.com>
Date: Mon, 28 Apr 2014 14:18:34 +0100
Subject: [PATCH] Adjust instruction sets for shared UID apps.

Since shared UID apps are run in the same process,
we'll need to make sure they're compiled for the same
instruction set.

This change implements the recompilation of apps that
don't have any ABI constraints.

Apps that *do* have ABI constraints are harder to deal
with, since we'll need to rescan them to figure out the
full list of ABIs they support and then re-extract the
native libraries from these apps once we find an ABI we
can use throughout.

(cherry picked from commit 85703d58af1dac692d7d83c03220e45ab2a5aded)

Change-Id: I8311a683468488cc7e30381965487a3d391609ae
---
 .../server/pm/PackageManagerService.java      | 60 +++++++++++++++++++
 .../java/com/android/server/pm/Settings.java  |  6 ++
 2 files changed, 66 insertions(+)

diff --git a/services/java/com/android/server/pm/PackageManagerService.java b/services/java/com/android/server/pm/PackageManagerService.java
index 9350768d999eb..7183a17bdee15 100755
--- a/services/java/com/android/server/pm/PackageManagerService.java
+++ b/services/java/com/android/server/pm/PackageManagerService.java
@@ -1476,6 +1476,12 @@ public class PackageManagerService extends IPackageManager.Stub {
             // the correct library paths.
             updateAllSharedLibrariesLPw();
 
+
+            for (SharedUserSetting setting : mSettings.getAllSharedUsersLPw()) {
+                adjustCpuAbisForSharedUserLPw(setting.packages, true /* do dexopt */,
+                        false /* force dexopt */, false /* defer dexopt */);
+            }
+
             EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_SCAN_END,
                     SystemClock.uptimeMillis());
             Slog.i(TAG, "Time to scan packages: "
@@ -4968,6 +4974,12 @@ public class PackageManagerService extends IPackageManager.Stub {
 
         // writer
         synchronized (mPackages) {
+            if ((scanMode&SCAN_BOOTING) == 0 && pkgSetting.sharedUser != null) {
+                // We don't do this here during boot because we can do it all
+                // at once after scanning all existing packages.
+                adjustCpuAbisForSharedUserLPw(pkgSetting.sharedUser.packages,
+                        true, forceDex, (scanMode & SCAN_DEFER_DEX) != 0);
+            }
             // We don't expect installation to fail beyond this point,
             if ((scanMode&SCAN_MONITOR) != 0) {
                 mAppDirs.put(pkg.mPath, pkg);
@@ -5311,6 +5323,54 @@ public class PackageManagerService extends IPackageManager.Stub {
         return pkg;
     }
 
+    public void adjustCpuAbisForSharedUserLPw(Set<PackageSetting> packagesForUser,
+            boolean doDexOpt, boolean forceDexOpt, boolean deferDexOpt) {
+        String requiredInstructionSet = null;
+        PackageSetting requirer = null;
+        for (PackageSetting ps : packagesForUser) {
+            if (ps.requiredCpuAbiString != null) {
+                final String instructionSet = VMRuntime.getInstructionSet(ps.requiredCpuAbiString);
+                if (requiredInstructionSet != null) {
+                    if (!instructionSet.equals(requiredInstructionSet)) {
+                        // We have a mismatch between instruction sets (say arm vs arm64).
+                        //
+                        // TODO: We should rescan all the packages in a shared UID to check if
+                        // they do contain shared libs for other ABIs in addition to the ones we've
+                        // already extracted. For example, the package might contain both arm64-v8a
+                        // and armeabi-v7a shared libs, and we'd have chosen arm64-v8a on 64 bit
+                        // devices.
+                        String errorMessage = "Instruction set mismatch, " + requirer.pkg.packageName
+                                + " requires " + requiredInstructionSet + " whereas " + ps.pkg.packageName
+                                + " requires " + instructionSet;
+                        Slog.e(TAG, errorMessage);
+
+                        reportSettingsProblem(Log.WARN, errorMessage);
+                        // Give up, don't bother making any other changes to the package settings.
+                        return;
+                    }
+                } else {
+                    requiredInstructionSet = instructionSet;
+                    requirer = ps;
+                }
+            }
+        }
+
+        if (requiredInstructionSet != null) {
+            for (PackageSetting ps : packagesForUser) {
+                if (ps.requiredCpuAbiString == null) {
+                    ps.requiredCpuAbiString = requirer.requiredCpuAbiString;
+                    ps.pkg.applicationInfo.requiredCpuAbi = requirer.requiredCpuAbiString;
+
+                    Slog.i(TAG, "Adjusting ABI for : " + ps.pkg.packageName + " to " + ps.requiredCpuAbiString);
+                    if (doDexOpt) {
+                        performDexOptLI(ps.pkg, forceDexOpt, deferDexOpt, true);
+                        mInstaller.rmdex(ps.codePathString, getPreferredInstructionSet());
+                    }
+                }
+            }
+        }
+    }
+
     private void setUpCustomResolverActivity(PackageParser.Package pkg) {
         synchronized (mPackages) {
             mResolverReplaced = true;
diff --git a/services/java/com/android/server/pm/Settings.java b/services/java/com/android/server/pm/Settings.java
index a50c689d06432..dad30e4365f86 100644
--- a/services/java/com/android/server/pm/Settings.java
+++ b/services/java/com/android/server/pm/Settings.java
@@ -36,6 +36,7 @@ import com.android.internal.util.JournaledFile;
 import com.android.internal.util.XmlUtils;
 import com.android.server.pm.PackageManagerService.DumpState;
 
+import java.util.Collection;
 import org.xmlpull.v1.XmlPullParser;
 import org.xmlpull.v1.XmlPullParserException;
 import org.xmlpull.v1.XmlSerializer;
@@ -262,6 +263,11 @@ final class Settings {
         return s;
     }
 
+    Collection<SharedUserSetting> getAllSharedUsersLPw() {
+        return mSharedUsers.values();
+    }
+
+
     boolean disableSystemPackageLPw(String name) {
         final PackageSetting p = mPackages.get(name);
         if(p == null) {