NonSFI mode: Enable compiling exception_test for NonSFI NaCl on ARM

SConstruct

Index: SConstruct
diff --git a/SConstruct b/SConstruct
index ab58f1dc8d671ad7ecb68a45e5e27d196a24ff34..4372c1e16b4b74440be216b40c33020eea6bc775 100755
--- a/SConstruct
+++ b/SConstruct
@@ -684,6 +684,9 @@ nonsfi_test_whitelist = set([
     'run_stack_alignment_test',
     'run_syscall_test',
     'run_thread_test',
+
+    # TODO(uekawa): Enable exception test when implementation is ready.
+    # 'run_exception_test',
     ])
 
 
@@ -3004,6 +3007,23 @@ def AllowInlineAssembly(env):
       inline assembly, it returns False.  Otherwise, on success, it
       returns True.
   """
+  if env.Bit('nonsfi_nacl'):
+    if not AllowNonStableBitcode(env):
+      return False
+    # Specifying the target arch is necessary for using inline
+    # assembly in pNaCl.
+    if env.Bit('target_x86_32'):
+      env.AppendUnique(CCFLAGS=['--target=i686-unknown-nacl',
+                                '--pnacl-allow-translate'])
+    elif env.Bit('target_arm'):
+      env.AppendUnique(CCFLAGS=['--target=arm-unknown-nacl',
+                                '-mfloat-abi=hard',
+                                '--pnacl-allow-translate'])
+    else:
+      return False
+    env.AppendUnique(LINKFLAGS=['--pnacl-disable-abi-check',])
+    return True;
+
   if env.Bit('bitcode'):

[Junichi Uekawa, 2014/09/09 12:23:58]

I am a little bit confused by how this part is constructed since the flags are
slightly different from what we're using in src/nonsfi/linux/nacl.scons

Not sure if I can merge the two sections and if that makes things easier to
maintain / read, and I don't claim to have understood what's happening here
quite yet.

     # For each architecture, we only attempt to make our inline
     # assembly code work with one untrusted-code toolchain.  For x86,