1 /*
2 * Copyright (C) 2022 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <err.h>
18 #include <errno.h>
19 #include <kernel/thread.h>
20 #include <stdlib.h>
21 #include <trusty/libc_state.h>
22 #include "locale_impl.h"
23
libc_state_create(void)24 static struct libc_state* libc_state_create(void) {
25 struct libc_state* state = calloc(1, sizeof(struct libc_state));
26 if (state != NULL) {
27 state->errno_val = 0;
28 state->locale = C_LOCALE;
29 }
30 return state;
31 }
32
libc_state_thread_init(thread_t * t)33 int libc_state_thread_init(thread_t* t) {
34 if (t == NULL) {
35 return ERR_INVALID_ARGS;
36 }
37 struct libc_state* state = libc_state_create();
38 if (state == NULL) {
39 return ERR_NO_RESOURCES;
40 }
41 thread_tls_set(t, TLS_ENTRY_LIBC, (uintptr_t)state);
42 return NO_ERROR;
43 }
44
libc_state_thread_free(thread_t * t)45 int libc_state_thread_free(thread_t* t) {
46 if (t == NULL) {
47 return ERR_INVALID_ARGS;
48 }
49 struct libc_state* state =
50 (struct libc_state*)thread_tls_get(t, TLS_ENTRY_LIBC);
51 ASSERT(state);
52 free(state);
53
54 /* Replace the old TLS entry with NULL to remove the dangling pointer and
55 * catch double frees */
56 thread_tls_set(t, TLS_ENTRY_LIBC, (uintptr_t)NULL);
57
58 return NO_ERROR;
59 }
60
current_thread_libc_state(void)61 struct libc_state* current_thread_libc_state(void) {
62 return (struct libc_state*)tls_get(TLS_ENTRY_LIBC);
63 }
64
__errno_location(void)65 int* __errno_location(void) {
66 struct libc_state* state = current_thread_libc_state();
67 DEBUG_ASSERT(state);
68 return &state->errno_val;
69 }
70
71 weak_alias(__errno_location, ___errno_location);
72