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| 1 | /* |
1 | /* |
| 2 | * Copyright (C) 2006 Martin Decky |
2 | * Copyright (C) 2006 Martin Decky |
| 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 | #ifndef __LIBC__ppc32__THREAD_H__ |
29 | #ifndef __LIBC__ppc32__THREAD_H__ |
| 30 | #define __LIBC__ppc32__THREAD_H__ |
30 | #define __LIBC__ppc32__THREAD_H__ |
| 31 | 31 | ||
| 32 | /* I did not find any specification (neither MIPS nor PowerPC), but |
- | |
| 33 | * as I found it |
- | |
| 34 | * - it uses Variant II |
- | |
| 35 | * - TCB is at Address(First TLS Block)+0x7000. |
- | |
| 36 | * - DTV is at Address(First TLS Block)+0x8000 |
- | |
| 37 | * - What would happen if the TLS data was larger then 0x7000? |
- | |
| 38 | * - The linker never accesses DTV directly, has the second definition any |
- | |
| 39 | * sense? |
- | |
| 40 | * We will make it this way: |
- | |
| 41 | * - TCB is at TP-0x7000-sizeof(tcb) |
- | |
| 42 | * - No assumption about DTV etc., but it will not have a fixed address |
- | |
| 43 | */ |
- | |
| 44 | #define PPC_TP_OFFSET 0x7000 |
32 | #define PPC_TP_OFFSET 0x7000 |
| 45 | 33 | ||
| 46 | typedef struct { |
34 | typedef struct { |
| 47 | void *pst_data; |
35 | void *pst_data; |
| 48 | } tcb_t; |
36 | } tcb_t; |
| 49 | 37 | ||
| 50 | static inline void __tcb_set(tcb_t *tcb) |
38 | static inline void __tcb_set(tcb_t *tcb) |
| 51 | { |
39 | { |
| 52 | void *tp = tcb; |
40 | void *tp = tcb; |
| 53 | tp += PPC_TP_OFFSET + sizeof(tcb_t); |
41 | tp += PPC_TP_OFFSET + sizeof(tcb_t); |
| 54 | 42 | ||
| 55 | asm volatile ( |
43 | asm volatile ( |
| 56 | "mr %%r2, %0\n" |
44 | "mr %%r2, %0\n" |
| 57 | : |
45 | : |
| 58 | : "r" (tp) |
46 | : "r" (tp) |
| 59 | ); |
47 | ); |
| 60 | } |
48 | } |
| 61 | 49 | ||
| 62 | static inline tcb_t * __tcb_get(void) |
50 | static inline tcb_t * __tcb_get(void) |
| 63 | { |
51 | { |
| 64 | void * retval; |
52 | void * retval; |
| 65 | 53 | ||
| 66 | asm volatile ( |
54 | asm volatile ( |
| 67 | "mr %0, %%r2\n" |
55 | "mr %0, %%r2\n" |
| 68 | : "=r" (retval) |
56 | : "=r" (retval) |
| 69 | ); |
57 | ); |
| 70 | 58 | ||
| 71 | return (tcb_t *)(retval - PPC_TP_OFFSET - sizeof(tcb_t)); |
59 | return (tcb_t *)(retval - PPC_TP_OFFSET - sizeof(tcb_t)); |
| 72 | } |
60 | } |
| 73 | 61 | ||
| 74 | #endif |
62 | #endif |
| 75 | 63 | ||