Intial Thumb2 Sandbox (naclrev 6680)

src/trusted/validator_arm/testdata-thumb/test_internal_jumps.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.
+
+.code 16
+.syntax unified
+.globl _start
+.thumb_func
+_start:
+
+@ Test forwards jumps
+  b bundle_good
+  b middle_good
+  b middle_bad
+
+@ Nop pad to bundle alignment
+nop
+nop
+nop
+nop
+nop
+nop
+nop
+nop
+nop
+nop
+
+bundle_good:
+  nop
+middle_good:
+  bic lr, lr, #0xf0000000
+  orr lr, lr, #0x0000000f
+middle_bad:
+  bx lr
+
+@ Test backwards jumps
+
+  b bundle_good
+  b middle_good
+  b middle_bad
+
+@ Another nop pad
+nop
+nop
+nop
+nop
+
+@ Test similar jumps with variations on the mask
+
+  bic lr, lr, #0xc0000000  @ 1GiB mask
+  orr lr, lr, #0x0000000f
+  bx lr                    @ should succeed
+
+  bic lr, lr, #0x80000000  @ 2GiB mask
+  orr lr, lr, #0x0000000f
+  bx lr                    @ must fail
+
+  bic lr, lr, #0xe0000000  @ in between mask
+  orr lr, lr, #0x0000000f
+  bx lr                    @ also succeeds
+
+@ Test the OR mask now
+
+  bic lr, lr, #0xc0000000   @ 1GiB mask
+  orr lr, lr, #0x0000001f
+  bx lr                     @ should fail (additional bit set)
+
+  bic lr, lr, #0xc0000000
+  bx lr                     @ must fail (no oring)
+
+  bic lr, lr, #0xc0000000   @ in between mask
+  orr lr, lr, #0x0000000e
+  bx lr                     @ must fail (too few bits set)
+