diff options
Diffstat (limited to 'libc')
| -rw-r--r-- | libc/sysdeps/linux/hppa/bits/atomic.h | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/hppa/bits/atomic.h b/libc/sysdeps/linux/hppa/bits/atomic.h new file mode 100644 index 000000000..87aeb84a0 --- /dev/null +++ b/libc/sysdeps/linux/hppa/bits/atomic.h @@ -0,0 +1,103 @@ +/* Copyright (C) 2003 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <stdint.h> +#include <bits/kernel-features.h> + +#define ABORT_INSTRUCTION __asm__(__UCLIBC_ABORT_INSTRUCTION__) + +/* We need EFAULT, ENOSYS */ +#if !defined EFAULT && !defined ENOSYS +#define EFAULT 14 +#define ENOSYS 251 +#endif + +#ifndef _BITS_ATOMIC_H +#define _BITS_ATOMIC_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; + +/* 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", "r26", "r25", "r24", "r23", "r22", "r21", "r20", "r28", "r31", "memory" +#define ASM_EAGAIN "11" + +#if __ASSUME_LWS_CAS +/* The only basic operation needed is compare and exchange. */ +# define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \ + ({ \ + volatile int lws_errno = EFAULT; \ + volatile int lws_ret = 0xdeadbeef; \ + __asm__ volatile( \ + "0: \n\t" \ + "copy %3, %%r26 \n\t" \ + "copy %4, %%r25 \n\t" \ + "copy %5, %%r24 \n\t" \ + "ble " LWS "(%%sr2, %%r0) \n\t" \ + "ldi " LWS_CAS ", %%r20 \n\t" \ + "cmpib,=,n " ASM_EAGAIN ",%%r21,0b \n\t" \ + "nop \n\t" \ + "stw %%r28, %0 \n\t" \ + "sub %%r0, %%r21, %%r21 \n\t" \ + "stw %%r21, %1 \n\t" \ + : "=m" (lws_ret), "=m" (lws_errno), "=m" (*mem) \ + : "r" (mem), "r" (oldval), "r" (newval) \ + : LWS_CLOBBER \ + ); \ + \ + if(lws_errno == EFAULT || lws_errno == ENOSYS) \ + ABORT_INSTRUCTION; \ + \ + lws_ret; \ + }) + +# define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \ + ({ \ + int ret; \ + ret = atomic_compare_and_exchange_val_acq(mem, newval, oldval); \ + /* Return 1 if it was already acquired */ \ + (ret != oldval); \ + }) +#else +# error __ASSUME_LWS_CAS is required to build uClibc. +#endif +/* __ASSUME_LWS_CAS */ + +#endif +/* _BITS_ATOMIC_H */ |