OLD | NEW |
(Empty) | |
| 1 /* |
| 2 * Copyright 2012 The Native Client Authors. All rights reserved. |
| 3 * Use of this source code is governed by a BSD-style license that can |
| 4 * be found in the LICENSE file. |
| 5 */ |
| 6 |
| 7 #include "native_client/src/trusted/service_runtime/arch/mips/sel_rt.h" |
| 8 #include "native_client/src/trusted/service_runtime/nacl_config.h" |
| 9 |
| 10 .text |
| 11 |
| 12 /* |
| 13 * This trusted code is linked into the service_runtime and |
| 14 * executed when switching from the service runtime to a nacl |
| 15 * module. This happens when a main nacl thread is created and starting to |
| 16 * execute the nacl code, or when nacl module is returning from a system |
| 17 * call. This piece of code lives in a service runtime part of address space. |
| 18 * The one and only argument is in register a0 |
| 19 * |
| 20 * a0 -- address of thread context (struct NaClThreadContext) |
| 21 */ |
| 22 |
| 23 DEFINE_GLOBAL_HIDDEN_IDENTIFIER(NaClSwitch): |
| 24 |
| 25 .set noreorder |
| 26 |
| 27 /* |
| 28 * We clear registers a1, a2, a3, t0, t1, t2, t3, t4, t5 and ra to avoid |
| 29 * information leaks. The remaining registers are overwritten by the code that |
| 30 * follows after. |
| 31 */ |
| 32 |
| 33 addu $a1, $zero, $zero |
| 34 addu $a2, $zero, $zero |
| 35 addu $a3, $zero, $zero |
| 36 addu $t0, $zero, $zero |
| 37 addu $t1, $zero, $zero |
| 38 addu $t2, $zero, $zero |
| 39 addu $t3, $zero, $zero |
| 40 addu $t4, $zero, $zero |
| 41 addu $t5, $zero, $zero |
| 42 addu $ra, $zero, $zero |
| 43 |
| 44 /* NACL_CALLEE_SAVE_LIST BEGIN */ |
| 45 |
| 46 lui $t6, %hi(NACL_CONTROL_FLOW_MASK) |
| 47 addiu $t6, $t6, %lo(NACL_CONTROL_FLOW_MASK) |
| 48 lui $t7, %hi(NACL_DATA_FLOW_MASK) |
| 49 addiu $t7, $t7, %lo(NACL_DATA_FLOW_MASK) |
| 50 lw $s0, NACL_THREAD_CONTEXT_OFFSET_S0($a0) |
| 51 lw $s1, NACL_THREAD_CONTEXT_OFFSET_S1($a0) |
| 52 lw $s2, NACL_THREAD_CONTEXT_OFFSET_S2($a0) |
| 53 lw $s3, NACL_THREAD_CONTEXT_OFFSET_S3($a0) |
| 54 lw $s4, NACL_THREAD_CONTEXT_OFFSET_S4($a0) |
| 55 lw $s5, NACL_THREAD_CONTEXT_OFFSET_S5($a0) |
| 56 lw $s6, NACL_THREAD_CONTEXT_OFFSET_S6($a0) |
| 57 lw $s7, NACL_THREAD_CONTEXT_OFFSET_S7($a0) |
| 58 lw $t8, NACL_THREAD_CONTEXT_OFFSET_T8($a0) |
| 59 lw $gp, NACL_THREAD_CONTEXT_OFFSET_GLOBAL_PTR($a0) |
| 60 lw $sp, NACL_THREAD_CONTEXT_OFFSET_STACK_PTR($a0) |
| 61 lw $fp, NACL_THREAD_CONTEXT_OFFSET_FRAME_PTR($a0) |
| 62 |
| 63 /* NACL_CALLEE_SAVE_LIST END*/ |
| 64 |
| 65 lw $v0, NACL_THREAD_CONTEXT_OFFSET_SYSRET($a0) |
| 66 lw $v1, NACL_THREAD_CONTEXT_OFFSET_NEW_PROG_CTR($a0) |
| 67 |
| 68 /* At startup, context->sysret contains not the the return value, but the |
| 69 first argument. Put it in a0. */ |
| 70 addu $a0, $v0, $zero |
| 71 |
| 72 /* Transfer control to untrusted code */ |
| 73 jr $v1 |
| 74 nop |
| 75 |
| 76 .set reorder |
| 77 |
OLD | NEW |