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1 | /* |
1 | /* |
2 | * Copyright (c) 2007 Pavel Jancik, Michal Kebrt |
2 | * Copyright (c) 2007 Pavel Jancik, Michal Kebrt |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | /** @addtogroup libcarm32 |
29 | /** @addtogroup libcarm32 |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | /** @file |
32 | /** @file |
33 | * @brief Uspace threads and TLS. |
33 | * @brief Uspace threads and TLS. |
34 | */ |
34 | */ |
35 | 35 | ||
36 | #ifndef LIBC_arm32_THREAD_H_ |
36 | #ifndef LIBC_arm32_THREAD_H_ |
37 | #define LIBC_arm32_THREAD_H_ |
37 | #define LIBC_arm32_THREAD_H_ |
38 | 38 | ||
39 | #include <unistd.h> |
39 | #include <unistd.h> |
40 | 40 | ||
41 | /** Stack initial size. */ |
41 | /** Stack initial size. */ |
42 | #define THREAD_INITIAL_STACK_PAGES_NO 1 |
42 | #define THREAD_INITIAL_STACK_PAGES_NO 1 |
43 | 43 | ||
44 | /** Offsets for accessing __thread variables are shifted 8 bytes higher. */ |
44 | /** Offsets for accessing __thread variables are shifted 8 bytes higher. */ |
45 | #define ARM_TP_OFFSET (-8) |
45 | #define ARM_TP_OFFSET (-8) |
46 | 46 | ||
47 | /** TCB (Thread Control Block) struct. |
47 | /** TCB (Thread Control Block) struct. |
48 | * |
48 | * |
49 | * TLS starts just after this struct. |
49 | * TLS starts just after this struct. |
50 | */ |
50 | */ |
51 | typedef struct { |
51 | typedef struct { |
52 | /** psthread data. */ |
52 | /** psthread data. */ |
53 | void *pst_data; |
53 | void *pst_data; |
54 | } tcb_t; |
54 | } tcb_t; |
55 | 55 | ||
56 | 56 | ||
57 | /** Sets TLS address to the r9 register. |
57 | /** Sets TLS address to the r9 register. |
58 | * |
58 | * |
59 | * @param tcb TCB (TLS starts behind) |
59 | * @param tcb TCB (TLS starts behind) |
60 | */ |
60 | */ |
61 | static inline void __tcb_set(tcb_t *tcb) |
61 | static inline void __tcb_set(tcb_t *tcb) |
62 | { |
62 | { |
63 | void *tls = (void *)tcb; |
63 | void *tls = (void *) tcb; |
64 | tls += sizeof(tcb_t) + ARM_TP_OFFSET; |
64 | tls += sizeof(tcb_t) + ARM_TP_OFFSET; |
65 | asm volatile ( |
65 | asm volatile ( |
66 | "mov r9, %0" |
66 | "mov r9, %0" |
67 | : |
67 | : |
68 | : "r"(tls) |
68 | : "r"(tls) |
69 | ); |
69 | ); |
70 | } |
70 | } |
71 | 71 | ||
72 | 72 | ||
73 | /** Returns TCB address. |
73 | /** Returns TCB address. |
74 | * |
74 | * |
75 | * @return TCB address (starts before TLS which address is stored in r9 register). |
75 | * @return TCB address (starts before TLS which address is stored in r9 register). |
76 | */ |
76 | */ |
77 | static inline tcb_t *__tcb_get(void) |
77 | static inline tcb_t *__tcb_get(void) |
78 | { |
78 | { |
79 | void *ret; |
79 | void *ret; |
80 | asm volatile ( |
80 | asm volatile ( |
81 | "mov %0, r9" |
81 | "mov %0, r9" |
82 | : "=r"(ret) |
82 | : "=r"(ret) |
83 | ); |
83 | ); |
84 | return (tcb_t *)(ret - ARM_TP_OFFSET - sizeof(tcb_t)); |
84 | return (tcb_t *) (ret - ARM_TP_OFFSET - sizeof(tcb_t)); |
85 | } |
85 | } |
86 | 86 | ||
87 | 87 | ||
88 | /** Returns TLS address stored. |
88 | /** Returns TLS address stored. |
89 | * |
89 | * |
90 | * Implemented in assembly. |
90 | * Implemented in assembly. |
91 | * |
91 | * |
92 | * @return TLS address stored in r9 register |
92 | * @return TLS address stored in r9 register |
93 | */ |
93 | */ |
94 | extern uintptr_t __aeabi_read_tp(void); |
94 | extern uintptr_t __aeabi_read_tp(void); |
95 | 95 | ||
96 | #endif |
96 | #endif |
97 | 97 | ||
98 | /** @} |
98 | /** @} |
99 | */ |
99 | */ |
100 | 100 |