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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 lw $t6, NACL_THREAD_CONTEXT_OFFSET_T6($a0) | |
47 lw $t7, NACL_THREAD_CONTEXT_OFFSET_T7($a0) | |
48 lw $s0, NACL_THREAD_CONTEXT_OFFSET_S0($a0) | |
49 lw $s1, NACL_THREAD_CONTEXT_OFFSET_S1($a0) | |
50 lw $s2, NACL_THREAD_CONTEXT_OFFSET_S2($a0) | |
51 lw $s3, NACL_THREAD_CONTEXT_OFFSET_S3($a0) | |
52 lw $s4, NACL_THREAD_CONTEXT_OFFSET_S4($a0) | |
53 lw $s5, NACL_THREAD_CONTEXT_OFFSET_S5($a0) | |
54 lw $s6, NACL_THREAD_CONTEXT_OFFSET_S6($a0) | |
55 lw $s7, NACL_THREAD_CONTEXT_OFFSET_S7($a0) | |
56 lw $t8, NACL_THREAD_CONTEXT_OFFSET_T8($a0) | |
57 lw $gp, NACL_THREAD_CONTEXT_OFFSET_GLOBAL_PTR($a0) | |
58 lw $sp, NACL_THREAD_CONTEXT_OFFSET_STACK_PTR($a0) | |
59 lw $fp, NACL_THREAD_CONTEXT_OFFSET_FRAME_PTR($a0) | |
60 | |
61 /* NACL_CALLEE_SAVE_LIST END*/ | |
62 | |
63 lw $v0, 60($a0) /* context->sysret */ | |
Mark Seaborn
2012/09/18 03:24:34
Can you use NACL_THREAD_CONTEXT_OFFSET_SYSRET here
petarj
2012/09/19 17:27:51
Done.
| |
64 lw $v1, 64($a0) /* context->new_prog_ctr */ | |
Mark Seaborn
2012/09/18 03:24:34
Same here: use a #defined constant.
petarj
2012/09/19 17:27:51
Done.
| |
65 | |
66 /* At startup, context->sysret contains not the the return value, but the | |
67 first argument. Put it in a0. */ | |
68 addu $a0, $v0, $zero | |
69 | |
70 /* Transfer control to untrusted code */ | |
71 jr $v1 | |
72 nop | |
73 | |
74 .set reorder | |
75 | |
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