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| 1 | /* Copyright (C) 2003-2022 Free Software Foundation, Inc. |
|---|---|
| 2 | This file is part of the GNU C Library. |
| 3 | |
| 4 | The GNU C Library is free software; you can redistribute it and/or |
| 5 | modify it under the terms of the GNU Lesser General Public |
| 6 | License as published by the Free Software Foundation; either |
| 7 | version 2.1 of the License, or (at your option) any later version. |
| 8 | |
| 9 | The GNU C Library is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library. If not, see |
| 16 | <https://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #ifndef _ATOMIC_MACHINE_H |
| 19 | #define _ATOMIC_MACHINE_H 1 |
| 20 | |
| 21 | #define atomic_full_barrier() __sync_synchronize () |
| 22 | |
| 23 | #define __HAVE_64B_ATOMICS 0 |
| 24 | #define USE_ATOMIC_COMPILER_BUILTINS 0 |
| 25 | |
| 26 | /* We use the compiler atomic load and store builtins as the generic |
| 27 | defines are not atomic. In particular, we need to use compare and |
| 28 | exchange for stores as the implementation is synthesized. */ |
| 29 | void __atomic_link_error (void); |
| 30 | #define __atomic_check_size_ls(mem) \ |
| 31 | if ((sizeof (*mem) != 1) && (sizeof (*mem) != 2) && sizeof (*mem) != 4) \ |
| 32 | __atomic_link_error (); |
| 33 | |
| 34 | #define atomic_load_relaxed(mem) \ |
| 35 | ({ __atomic_check_size_ls((mem)); \ |
| 36 | __atomic_load_n ((mem), __ATOMIC_RELAXED); }) |
| 37 | #define atomic_load_acquire(mem) \ |
| 38 | ({ __atomic_check_size_ls((mem)); \ |
| 39 | __atomic_load_n ((mem), __ATOMIC_ACQUIRE); }) |
| 40 | |
| 41 | #define atomic_store_relaxed(mem, val) \ |
| 42 | do { \ |
| 43 | __atomic_check_size_ls((mem)); \ |
| 44 | __atomic_store_n ((mem), (val), __ATOMIC_RELAXED); \ |
| 45 | } while (0) |
| 46 | #define atomic_store_release(mem, val) \ |
| 47 | do { \ |
| 48 | __atomic_check_size_ls((mem)); \ |
| 49 | __atomic_store_n ((mem), (val), __ATOMIC_RELEASE); \ |
| 50 | } while (0) |
| 51 | |
| 52 | /* XXX Is this actually correct? */ |
| 53 | #define ATOMIC_EXCHANGE_USES_CAS 1 |
| 54 | |
| 55 | /* prev = *addr; |
| 56 | if (prev == old) |
| 57 | *addr = new; |
| 58 | return prev; */ |
| 59 | |
| 60 | /* Use the kernel atomic light weight syscalls on hppa. */ |
| 61 | #define _LWS "0xb0" |
| 62 | #define _LWS_CAS "0" |
| 63 | /* Note r31 is the link register. */ |
| 64 | #define _LWS_CLOBBER "r1", "r23", "r22", "r20", "r31", "memory" |
| 65 | /* String constant for -EAGAIN. */ |
| 66 | #define _ASM_EAGAIN "-11" |
| 67 | /* String constant for -EDEADLOCK. */ |
| 68 | #define _ASM_EDEADLOCK "-45" |
| 69 | |
| 70 | /* The only basic operation needed is compare and exchange. The mem |
| 71 | pointer must be word aligned. We no longer loop on deadlock. */ |
| 72 | #define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \ |
| 73 | ({ \ |
| 74 | register long lws_errno asm("r21"); \ |
| 75 | register unsigned long lws_ret asm("r28"); \ |
| 76 | register unsigned long lws_mem asm("r26") = (unsigned long)(mem); \ |
| 77 | register unsigned long lws_old asm("r25") = (unsigned long)(oldval);\ |
| 78 | register unsigned long lws_new asm("r24") = (unsigned long)(newval);\ |
| 79 | __asm__ __volatile__( \ |
| 80 | "0: \n\t" \ |
| 81 | "ble " _LWS "(%%sr2, %%r0) \n\t" \ |
| 82 | "ldi " _LWS_CAS ", %%r20 \n\t" \ |
| 83 | "cmpiclr,<> " _ASM_EAGAIN ", %%r21, %%r0\n\t" \ |
| 84 | "b,n 0b \n\t" \ |
| 85 | "cmpclr,= %%r0, %%r21, %%r0 \n\t" \ |
| 86 | "iitlbp %%r0,(%%sr0, %%r0) \n\t" \ |
| 87 | : "=r" (lws_ret), "=r" (lws_errno) \ |
| 88 | : "r" (lws_mem), "r" (lws_old), "r" (lws_new) \ |
| 89 | : _LWS_CLOBBER \ |
| 90 | ); \ |
| 91 | \ |
| 92 | (__typeof (oldval)) lws_ret; \ |
| 93 | }) |
| 94 | |
| 95 | #define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \ |
| 96 | ({ \ |
| 97 | __typeof__ (*mem) ret; \ |
| 98 | ret = atomic_compare_and_exchange_val_acq(mem, newval, oldval); \ |
| 99 | /* Return 1 if it was already acquired. */ \ |
| 100 | (ret != oldval); \ |
| 101 | }) |
| 102 | |
| 103 | #endif |
| 104 | /* _ATOMIC_MACHINE_H */ |
| 105 |
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