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Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/hppa/atomic-machine.h')
| -rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/hppa/atomic-machine.h | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/hppa/atomic-machine.h b/REORG.TODO/sysdeps/unix/sysv/linux/hppa/atomic-machine.h new file mode 100644 index 0000000000..59581bd4bc --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/hppa/atomic-machine.h @@ -0,0 +1,94 @@ +/* Copyright (C) 2003-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Carlos O'Donell <carlos@baldric.uwo.ca>, 2005. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library. If not, see + <http://www.gnu.org/licenses/>. */ + +#include <stdint.h> /* Required for type definitions e.g. uint8_t. */ + +#ifndef _ATOMIC_MACHINE_H +#define _ATOMIC_MACHINE_H 1 + +typedef int8_t atomic8_t; +typedef uint8_t uatomic8_t; +typedef int_fast8_t atomic_fast8_t; +typedef uint_fast8_t uatomic_fast8_t; + +typedef int32_t atomic32_t; +typedef uint32_t uatomic32_t; +typedef int_fast32_t atomic_fast32_t; +typedef uint_fast32_t uatomic_fast32_t; + +typedef intptr_t atomicptr_t; +typedef uintptr_t uatomicptr_t; +typedef intmax_t atomic_max_t; +typedef uintmax_t uatomic_max_t; + +#define __HAVE_64B_ATOMICS 0 +#define USE_ATOMIC_COMPILER_BUILTINS 0 + +/* XXX Is this actually correct? */ +#define ATOMIC_EXCHANGE_USES_CAS 1 + +/* prev = *addr; + if (prev == old) + *addr = new; + return prev; */ + +/* Use the kernel atomic light weight syscalls on hppa. */ +#define _LWS "0xb0" +#define _LWS_CAS "0" +/* Note r31 is the link register. */ +#define _LWS_CLOBBER "r1", "r23", "r22", "r20", "r31", "memory" +/* String constant for -EAGAIN. */ +#define _ASM_EAGAIN "-11" +/* String constant for -EDEADLOCK. */ +#define _ASM_EDEADLOCK "-45" + +/* The only basic operation needed is compare and exchange. The mem + pointer must be word aligned. We no longer loop on deadlock. */ +#define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \ + ({ \ + register long lws_errno asm("r21"); \ + register unsigned long lws_ret asm("r28"); \ + register unsigned long lws_mem asm("r26") = (unsigned long)(mem); \ + register unsigned long lws_old asm("r25") = (unsigned long)(oldval);\ + register unsigned long lws_new asm("r24") = (unsigned long)(newval);\ + __asm__ __volatile__( \ + "0: \n\t" \ + "ble " _LWS "(%%sr2, %%r0) \n\t" \ + "ldi " _LWS_CAS ", %%r20 \n\t" \ + "cmpiclr,<> " _ASM_EAGAIN ", %%r21, %%r0\n\t" \ + "b,n 0b \n\t" \ + "cmpclr,= %%r0, %%r21, %%r0 \n\t" \ + "iitlbp %%r0,(%%sr0, %%r0) \n\t" \ + : "=r" (lws_ret), "=r" (lws_errno) \ + : "r" (lws_mem), "r" (lws_old), "r" (lws_new) \ + : _LWS_CLOBBER \ + ); \ + \ + (__typeof (oldval)) lws_ret; \ + }) + +#define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \ + ({ \ + __typeof__ (*mem) ret; \ + ret = atomic_compare_and_exchange_val_acq(mem, newval, oldval); \ + /* Return 1 if it was already acquired. */ \ + (ret != oldval); \ + }) + +#endif +/* _ATOMIC_MACHINE_H */ |