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| 1 /* |
| 2 * Copyright (c) 2013 The Native Client Authors. All rights reserved. |
| 3 * Use of this source code is governed by a BSD-style license that can be |
| 4 * found in the LICENSE file. |
| 5 */ |
| 6 |
| 7 /* |
| 8 * Assume 32-byte trampoline slots, 16-byte bundles. |
| 9 */ |
| 10 #define GETTIMEOFDAY_ADDR 0x10500 |
| 11 #define STORE_MASK $t7 |
| 12 #define JUMP_MASK $t6 |
| 13 |
| 14 .data |
| 15 timebuf: |
| 16 .space 0x200 /* enough for a timeval */ |
| 17 .text |
| 18 .globl SyscallReturnIsSandboxed |
| 19 SyscallReturnIsSandboxed: |
| 20 .set noreorder |
| 21 |
| 22 addiu $sp, $sp, -24 |
| 23 and $sp, $sp, STORE_MASK |
| 24 sw $ra, 20($sp) |
| 25 lui $a0, %hi(timebuf) |
| 26 |
| 27 addiu $a0, $a0, %lo(timebuf) |
| 28 addu $a1, $zero, $zero |
| 29 lui $ra, %hi(bad) |
| 30 addiu $ra, $ra, %lo(bad) |
| 31 |
| 32 lui $a2, %hi(GETTIMEOFDAY_ADDR) |
| 33 addiu $a2, $a2, %lo(GETTIMEOFDAY_ADDR) |
| 34 and $a2, $a2, JUMP_MASK |
| 35 jr $a2 |
| 36 |
| 37 nop /* sandboxed (bundle aligned) return address */ |
| 38 xor $v0, $v0, 1 /* expected return value */ |
| 39 bad: lw $ra, 20($sp) /* non-sandboxed return address */ |
| 40 nop |
| 41 |
| 42 addiu $sp, $sp, 24 |
| 43 and $sp, $sp, STORE_MASK |
| 44 and $ra, $ra, JUMP_MASK |
| 45 jr $ra |
| 46 |
| 47 nop |
| 48 |
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