Intial Thumb2 Sandbox (naclrev 6680)

src/trusted/validator_arm/testdata-thumb/test_sp_updates.S

+@ Copyright (c) 2011 The Native Client Authors.  All rights reserved.
+@ Use of this source code is governed by a BSD-style license that can
+@ be found in the LICENSE file.
+@ Copyright (c) 2011 Google Inc.
+
+@
+@ Tests both legal and illegal variations on SP updates.
+@
+
+#define MASK 0xC0000000
+
+.syntax unified
+.code 16
+.thumb_func
+.global _start
+_start:
+bundle0:
+  ldr r0, [sp], #4          @ SP post-update is fine.
+  ldr r0, [sp, #4]!         @ SP pre-update is fine.
+
+  ldm sp!, { r0, r1, r2 }   @ Update from ldm is fine.
+  stm sp!, { r0, r1, r2 }   @ Update from stm is fine.
+  nop
+  nop
+bundle1:
+  bic r0, r0, #MASK
+  mov sp, r0                @ Move-to-SP is not fine preceeded by a mask
+
+  add r0, r0, #1            @ something unexpected (ERROR).
+  mov sp, r0                @ Move-to-SP not okay when preceeded by else
+  nop
+  nop
+bundle2:
+  add sp, sp, #12           @ Adding a constant is not fine
+  ldr r0, [sp]              @ immediately followed by deref
+                            @ error
+
+  add sp, sp, #12
+  str r0, [sp], #0           @ Or a write.
+@                            @ error
+
+  add sp, sp, #12           @ Not okay when followed by
+  bic r0, r0, #12
+
+bundle3:
+  add sp, r0
+
+  nop
+  nop
+  nop
+  nop
+  nop
+  bic r0, r0, #MASK         @ Likewise, move-to-SP cannot be...
+
+bundle4:
+  mov sp, r0                @ ...broken across bundle (ERROR).
+
+bundle6:
+  str r0, [sp], #42       @ Update SP using immediate post-inc: should pass.