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| Rev | Author | Line No. | Line |
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| 1217 | decky | 1 | /* |
| 2 | * Copyright (C) 2006 Martin Decky |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | #ifndef __LIBC__ppc32__THREAD_H__ |
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| 30 | #define __LIBC__ppc32__THREAD_H__ |
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| 31 | |||
| 1286 | decky | 32 | /* I did not find any specification (neither MIPS nor PowerPC), but |
| 33 | * as I found it |
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| 34 | * - it uses Variant II |
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| 35 | * - TCB is at Address(First TLS Block)+0x7000. |
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| 36 | * - DTV is at Address(First TLS Block)+0x8000 |
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| 37 | * - What would happen if the TLS data was larger then 0x7000? |
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| 38 | * - The linker never accesses DTV directly, has the second definition any |
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| 39 | * sense? |
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| 40 | * We will make it this way: |
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| 41 | * - TCB is at TP-0x7000-sizeof(tcb) |
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| 42 | * - No assumption about DTV etc., but it will not have a fixed address |
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| 43 | */ |
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| 44 | #define PPC_TP_OFFSET 0x7000 |
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| 45 | |||
| 1217 | decky | 46 | typedef struct { |
| 47 | void *pst_data; |
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| 48 | } tcb_t; |
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| 49 | |||
| 50 | static inline void __tcb_set(tcb_t *tcb) |
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| 51 | { |
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| 1286 | decky | 52 | void *tp = tcb; |
| 53 | tp += PPC_TP_OFFSET + sizeof(tcb_t); |
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| 54 | |||
| 55 | asm volatile ( |
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| 56 | "mr %%r2, %0\n" |
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| 57 | : |
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| 58 | : "r" (tp) |
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| 59 | ); |
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| 1217 | decky | 60 | } |
| 61 | |||
| 62 | static inline tcb_t * __tcb_get(void) |
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| 63 | { |
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| 1286 | decky | 64 | void * retval; |
| 65 | |||
| 66 | asm volatile ( |
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| 67 | "mr %0, %%r2\n" |
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| 68 | : "=r" (retval) |
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| 69 | ); |
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| 70 | |||
| 71 | return (tcb_t *)(retval - PPC_TP_OFFSET - sizeof(tcb_t)); |
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| 1217 | decky | 72 | } |
| 73 | |||
| 74 | #endif |