| /* |
| * Copyright (c) 2012 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. |
| */ |
| |
| #include "native_client/src/trusted/service_runtime/include/bits/nacl_syscalls.h" |
| #include "native_client/src/trusted/service_runtime/nacl_config.h" |
| |
| .data |
| timebuf: |
| .space 0x200 /* enough for a timeval */ |
| |
| .text |
| .globl SyscallReturnIsSandboxed |
| SyscallReturnIsSandboxed: |
| pushl $0 |
| pushl $timebuf |
| pushl $1f |
| |
| movl $NACL_SYSCALL_ADDR(NACL_sys_gettimeofday), %ecx |
| and $0xffffffe0, %ecx |
| jmp *%ecx |
| |
| .p2align 5 |
| /* |
| * Here we have a whole bundle of halts, with the "return address" |
| * we pushed being in the middle of the bundle. The syscall return |
| * should round up this misaligned address to the beginning of the |
| * next bundle. If it fails to do that, we'll execute hlt and crash. |
| */ |
| hlt |
| 1: .p2align 5,0xf4 |
| |
| /* |
| * Now we're at the next bundle, where the return is rounded to. |
| * Test the tls_get call as well, since it may have an alternate |
| * entry/return path in the trampoline implementation. |
| */ |
| |
| pushl $2f |
| |
| movl $NACL_SYSCALL_ADDR(NACL_sys_tls_get), %ecx |
| andl $0xffffffe0, %ecx |
| jmp *%ecx |
| |
| .p2align 5 |
| hlt |
| 2: .p2align 5,0xf4 |
| |
| /* |
| * Now we're at the next bundle, where the return is rounded to. |
| */ |
| movl $1, %eax |
| addl $0x8, %esp |
| naclret |
| .p2align 5 /* -- pnacl toolchain leaves "..." without this */ |
