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1 | /* |
1 | /* |
2 | * Copyright (c) 2006 Ondrej Palkovsky |
2 | * Copyright (c) 2006 Ondrej Palkovsky |
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 libcmips32 |
29 | /** @addtogroup libcmips32 |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | /** @file |
32 | /** @file |
33 | * @ingroup libcmips32eb |
33 | * @ingroup libcmips32eb |
34 | */ |
34 | */ |
35 | 35 | ||
36 | /* TLS for MIPS is described in http://www.linux-mips.org/wiki/NPTL */ |
36 | /* TLS for MIPS is described in http://www.linux-mips.org/wiki/NPTL */ |
37 | 37 | ||
38 | #ifndef LIBC_mips32THREAD_H_ |
38 | #ifndef LIBC_mips32_THREAD_H_ |
39 | #define LIBC_mips32THREAD_H_ |
39 | #define LIBC_mips32_THREAD_H_ |
40 | 40 | ||
41 | /* I did not find any specification (neither MIPS nor PowerPC), but |
41 | /* I did not find any specification (neither MIPS nor PowerPC), but |
42 | * as I found it |
42 | * as I found it |
43 | * - it uses Variant II |
43 | * - it uses Variant II |
44 | * - TCB is at Address(First TLS Block)+0x7000. |
44 | * - TCB is at Address(First TLS Block)+0x7000. |
45 | * - DTV is at Address(First TLS Block)+0x8000 |
45 | * - DTV is at Address(First TLS Block)+0x8000 |
46 | * - What would happen if the TLS data was larger then 0x7000? |
46 | * - What would happen if the TLS data was larger then 0x7000? |
47 | * - The linker never accesses DTV directly, has the second definition any |
47 | * - The linker never accesses DTV directly, has the second definition any |
48 | * sense? |
48 | * sense? |
49 | * We will make it this way: |
49 | * We will make it this way: |
50 | * - TCB is at TP-0x7000-sizeof(tcb) |
50 | * - TCB is at TP-0x7000-sizeof(tcb) |
51 | * - No assumption about DTV etc., but it will not have a fixed address |
51 | * - No assumption about DTV etc., but it will not have a fixed address |
52 | */ |
52 | */ |
53 | #define MIPS_TP_OFFSET 0x7000 |
53 | #define MIPS_TP_OFFSET 0x7000 |
54 | 54 | ||
55 | typedef struct { |
55 | typedef struct { |
56 | void *pst_data; |
56 | void *fibril_data; |
57 | } tcb_t; |
57 | } tcb_t; |
58 | 58 | ||
59 | static inline void __tcb_set(tcb_t *tcb) |
59 | static inline void __tcb_set(tcb_t *tcb) |
60 | { |
60 | { |
61 | void *tp = tcb; |
61 | void *tp = tcb; |
62 | tp += MIPS_TP_OFFSET + sizeof(tcb_t); |
62 | tp += MIPS_TP_OFFSET + sizeof(tcb_t); |
63 | 63 | ||
64 | asm volatile ("add $27, %0, $0" : : "r"(tp)); /* Move tls to K1 */ |
64 | asm volatile ("add $27, %0, $0" : : "r"(tp)); /* Move tls to K1 */ |
65 | } |
65 | } |
66 | 66 | ||
67 | static inline tcb_t * __tcb_get(void) |
67 | static inline tcb_t * __tcb_get(void) |
68 | { |
68 | { |
69 | void * retval; |
69 | void * retval; |
70 | 70 | ||
71 | asm volatile("add %0, $27, $0" : "=r"(retval)); |
71 | asm volatile("add %0, $27, $0" : "=r"(retval)); |
72 | 72 | ||
73 | return (tcb_t *)(retval - MIPS_TP_OFFSET - sizeof(tcb_t)); |
73 | return (tcb_t *)(retval - MIPS_TP_OFFSET - sizeof(tcb_t)); |
74 | } |
74 | } |
75 | 75 | ||
76 | #endif |
76 | #endif |
77 | 77 | ||
78 | /** @} |
78 | /** @} |
79 | */ |
79 | */ |
80 | 80 |