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2006-06-08 Carlos O'Donell <carlos@systemhalted.org>
* sysdeps/hppa/hppa1.1/Implies: Remove ieee754/ldbl-128. * sysdeps/unix/sysv/linux/hppa/kernel-features.h [__LINUX_KERNEL_VERSION >= 0x020609]: Define __ASSUME_LWS_CAS. * sysdeps/unix/sysv/linux/hppa/bits/atomic.h: New file.
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Carlos O'Donell
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@ -1,3 +1,10 @@
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2006-06-08 Carlos O'Donell <carlos@systemhalted.org>
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* sysdeps/hppa/hppa1.1/Implies: Remove ieee754/ldbl-128.
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* sysdeps/unix/sysv/linux/hppa/kernel-features.h
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[__LINUX_KERNEL_VERSION >= 0x020609]: Define __ASSUME_LWS_CAS.
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* sysdeps/unix/sysv/linux/hppa/bits/atomic.h: New file.
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2006-06-08 Carlos O'Donell <carlos@systemhalted.org>
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* sysdeps/unix/sysv/linux/hppa/bits/fcntl.h: Reformat
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@ -1,4 +1,3 @@
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wordsize-32
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ieee754/flt-32
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ieee754/dbl-64
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ieee754/ldbl-128
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120
sysdeps/unix/sysv/linux/hppa/bits/atomic.h
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120
sysdeps/unix/sysv/linux/hppa/bits/atomic.h
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/* Copyright (C) 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Carlos O'Donell <carlos@baldric.uwo.ca>, 2005.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <stdint.h>
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#include <sysdep.h>
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#include <abort-instr.h>
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#include <kernel-features.h>
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/* We need EFAULT, ENONSYS, and EAGAIN */
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#if !defined EFAULT && !defined ENOSYS && !defined EAGAIN
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#undef EFAULT
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#undef ENOSYS
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#undef EAGAIN
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#define EFAULT 14
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#define ENOSYS 251
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#define EAGAIN 11
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#endif
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#ifndef _BITS_ATOMIC_H
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#define _BITS_ATOMIC_H 1
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typedef int8_t atomic8_t;
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typedef uint8_t uatomic8_t;
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typedef int_fast8_t atomic_fast8_t;
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typedef uint_fast8_t uatomic_fast8_t;
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typedef int32_t atomic32_t;
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typedef uint32_t uatomic32_t;
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typedef int_fast32_t atomic_fast32_t;
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typedef uint_fast32_t uatomic_fast32_t;
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typedef intptr_t atomicptr_t;
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typedef uintptr_t uatomicptr_t;
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typedef intmax_t atomic_max_t;
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typedef uintmax_t uatomic_max_t;
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/* prev = *addr;
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if (prev == old)
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*addr = new;
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return prev; */
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/* Use the kernel atomic light weight syscalls on hppa */
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#define LWS "0xb0"
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#define LWS_CAS 0x0
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/* Note r31 is the link register */
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#define LWS_CLOBBER "r1", "r26", "r25", "r24", "r23", "r22", "r21", "r20", "r28", "r31", "memory"
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#define ASM_EAGAIN "11"
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#if __ASSUME_LWS_CAS
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/* The only basic operation needed is compare and exchange. */
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# define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
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({ \
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volatile int lws_errno = EFAULT; \
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volatile int lws_ret = 0xdeadbeef; \
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asm volatile( \
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"0: \n\t" \
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"copy %3, %%r26 \n\t" \
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"copy %4, %%r25 \n\t" \
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"copy %5, %%r24 \n\t" \
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"ble " LWS "(%%sr2, %%r0) \n\t" \
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"ldi 0, %%r20 \n\t" \
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"cmpib,=,n " ASM_EAGAIN ",%%r21,0 \n\t" \
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"nop \n\t" \
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"stw %%r28, %0 \n\t" \
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"sub %%r0, %%r21, %%r21 \n\t" \
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"stw %%r21, %1 \n\t" \
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: "=m" (lws_ret), "=m" (lws_errno), "=m" (*mem) \
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: "r" (mem), "r" (oldval), "r" (newval) \
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: LWS_CLOBBER \
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); \
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\
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if(lws_errno == EFAULT || lws_errno == ENOSYS) \
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ABORT_INSTRUCTION; \
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\
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lws_ret; \
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})
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# define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \
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({ \
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int ret; \
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ret = atomic_compare_and_exchange_val_acq(mem, newval, oldval); \
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/* Return 1 if it was already acquired */ \
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(ret != oldval); \
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})
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#else
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/* Non-atomic primitives. */
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# define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
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({ __typeof (mem) __gmemp = (mem); \
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__typeof (*mem) __gret = *__gmemp; \
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__typeof (*mem) __gnewval = (newval); \
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\
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if (__gret == (oldval)) \
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*__gmemp = __gnewval; \
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__gret; })
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# define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \
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({ __typeof (mem) __gmemp = (mem); \
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__typeof (*mem) __gnewval = (newval); \
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\
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*__gmemp == (oldval) ? (*__gmemp = __gnewval, 0) : 1; })
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#endif
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#endif /* bits/atomic.h */
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@ -31,4 +31,9 @@
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#define __ASSUME_FCNTL64 1
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#define __ASSUME_GETDENTS64_SYSCALL 1
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/* PA-RISC 2.6.9 kernels had the first LWS CAS support */
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#if __LINUX_KERNEL_VERSION >= 0x020609
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# define __ASSUME_LWS_CAS 1
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#endif
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#include_next <kernel-features.h>
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