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From: Vineet Gupta <Vineet.Gupta1@synopsys.com>
To: libc-alpha@sourceware.org
Cc: Vineet Gupta <Vineet.Gupta1@synopsys.com>,
	linux-snps-arc@lists.infradead.org
Subject: [PATCH v4 05/15] ARC: Atomics and Locking primitives
Date: Thu, 12 Mar 2020 20:04:09 -0700
Message-ID: <20200313030419.15843-6-vgupta@synopsys.com> (raw)
In-Reply-To: <20200313030419.15843-1-vgupta@synopsys.com>

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
---
 sysdeps/arc/atomic-machine.h      | 73 +++++++++++++++++++++++++++++++
 sysdeps/arc/nptl/bits/semaphore.h | 32 ++++++++++++++
 2 files changed, 105 insertions(+)
 create mode 100644 sysdeps/arc/atomic-machine.h
 create mode 100644 sysdeps/arc/nptl/bits/semaphore.h

diff --git a/sysdeps/arc/atomic-machine.h b/sysdeps/arc/atomic-machine.h
new file mode 100644
index 000000000000..ae16c607dcc4
--- /dev/null
+++ b/sysdeps/arc/atomic-machine.h
@@ -0,0 +1,73 @@
+/* Low-level functions for atomic operations. ARC version.
+   Copyright (C) 2012-2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+#ifndef _ARC_BITS_ATOMIC_H
+#define _ARC_BITS_ATOMIC_H 1
+
+#include <stdint.h>
+
+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 1
+
+/* ARC does have legacy atomic EX reg, [mem] instruction but the micro-arch
+   is not as optimal as LLOCK/SCOND specially for SMP.  */
+#define ATOMIC_EXCHANGE_USES_CAS 1
+
+#define __arch_compare_and_exchange_bool_8_acq(mem, newval, oldval)	\
+  (abort (), 0)
+#define __arch_compare_and_exchange_bool_16_acq(mem, newval, oldval)	\
+  (abort (), 0)
+#define __arch_compare_and_exchange_bool_64_acq(mem, newval, oldval)	\
+  (abort (), 0)
+
+#define __arch_compare_and_exchange_val_8_int(mem, newval, oldval, model)	\
+  (abort (), (__typeof (*mem)) 0)
+#define __arch_compare_and_exchange_val_16_int(mem, newval, oldval, model)	\
+  (abort (), (__typeof (*mem)) 0)
+#define __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model)	\
+  (abort (), (__typeof (*mem)) 0)
+
+#define __arch_compare_and_exchange_val_32_int(mem, newval, oldval, model)	\
+  ({										\
+    typeof (*mem) __oldval = (oldval);                                  	\
+    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,    	\
+                                 model, __ATOMIC_RELAXED);              	\
+    __oldval;                                                           	\
+  })
+
+#define atomic_compare_and_exchange_val_acq(mem, new, old)		\
+  __atomic_val_bysize (__arch_compare_and_exchange_val, int,		\
+		       mem, new, old, __ATOMIC_ACQUIRE)
+
+#ifdef __ARC700__
+#define atomic_full_barrier()  ({ asm volatile ("sync":::"memory"); })
+#else
+#define atomic_full_barrier()  ({ asm volatile ("dmb 3":::"memory"); })
+#endif
+
+#endif /* _ARC_BITS_ATOMIC_H */
diff --git a/sysdeps/arc/nptl/bits/semaphore.h b/sysdeps/arc/nptl/bits/semaphore.h
new file mode 100644
index 000000000000..772dc4cb9b01
--- /dev/null
+++ b/sysdeps/arc/nptl/bits/semaphore.h
@@ -0,0 +1,32 @@
+/* Machine-specific POSIX semaphore type layouts.  ARC version.
+   Copyright (C) 2002-2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+#ifndef _SEMAPHORE_H
+# error "Never use <bits/semaphore.h> directly; include <semaphore.h> instead."
+#endif
+
+#define __SIZEOF_SEM_T	16
+
+/* Value returned if `sem_open' failed.  */
+#define SEM_FAILED      ((sem_t *) 0)
+
+typedef union
+{
+  char __size[__SIZEOF_SEM_T];
+  long int __align;
+} sem_t;
-- 
2.20.1


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  parent reply index

Thread overview: 63+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-13  3:04 [PATCH v4 00/15] glibc port to ARC processors Vineet Gupta
2020-03-13  3:04 ` [PATCH v4 01/15] ARC: add definitions to elf/elf.h Vineet Gupta
2020-03-26  1:37   ` Joseph Myers
2020-03-26  1:52     ` Vineet Gupta
2020-03-13  3:04 ` [PATCH v4 02/15] ARC: ABI Implementation Vineet Gupta
2020-03-26  1:52   ` Joseph Myers
2020-03-26  2:39     ` Vineet Gupta
2020-03-26 18:48       ` Joseph Myers
2020-03-27  0:37         ` Vineet Gupta
2020-03-27 23:33         ` Vineet Gupta
2020-03-27 23:35           ` Joseph Myers
2020-03-27 23:47             ` Vineet Gupta
2020-03-31 21:08         ` Big Endian support as multi-ABI (was Re: [PATCH v4 02/15] ARC: ABI Implementation) Vineet Gupta
2020-03-31 21:27           ` Joseph Myers
2020-03-31 21:35             ` Vineet Gupta
2020-03-13  3:04 ` [PATCH v4 03/15] ARC: startup and dynamic linking code Vineet Gupta
2020-03-26  1:55   ` Joseph Myers
2020-03-26  2:45     ` Vineet Gupta
2020-03-13  3:04 ` [PATCH v4 04/15] ARC: Thread Local Storage support Vineet Gupta
2020-03-26  1:57   ` Joseph Myers
2020-03-26  2:47     ` Vineet Gupta
2020-03-13  3:04 ` Vineet Gupta [this message]
2020-03-13  3:04 ` [PATCH v4 06/15] ARC: math soft float support Vineet Gupta
2020-03-26  1:59   ` Joseph Myers
2020-03-26  2:48     ` Vineet Gupta
2020-03-13  3:04 ` [PATCH v4 07/15] ARC: hardware floating point support Vineet Gupta
2020-03-26  2:06   ` Joseph Myers
2020-03-26  3:19     ` Vineet Gupta
2020-03-26 23:22   ` Joseph Myers
2020-03-27  1:50     ` Vineet Gupta
2020-03-27 18:37       ` Joseph Myers
2020-03-27 18:53         ` Vineet Gupta
2020-03-13  3:04 ` [PATCH v4 08/15] ARC: Linux Syscall Interface Vineet Gupta
2020-03-26 23:52   ` Joseph Myers
2020-03-27  4:34     ` Vineet Gupta
2020-03-27 18:38       ` Joseph Myers
2020-03-13  3:04 ` [PATCH v4 09/15] ARC: Linux ABI Vineet Gupta
2020-03-27  0:38   ` Joseph Myers
2020-03-27  4:45     ` Vineet Gupta
2020-03-13  3:04 ` [PATCH v4 10/15] ARC: Linux Startup and Dynamic Loading Vineet Gupta
2020-03-13  3:04 ` [PATCH v4 11/15] ARC: ABI lists Vineet Gupta
2020-03-27  0:40   ` Joseph Myers
2020-03-27  4:36     ` Vineet Gupta
2020-03-27 18:39       ` Joseph Myers
2020-03-27 19:09         ` Vineet Gupta
2020-03-13  3:04 ` [PATCH v4 12/15] ARC: Update syscall-names.list for ARC specific syscalls Vineet Gupta
2020-03-13  3:04 ` [PATCH v4 13/15] ARC: Build Infrastructure Vineet Gupta
2020-03-27 22:47   ` Joseph Myers
2020-03-28  6:42     ` Vineet Gupta
2020-03-31 22:02       ` Vineet Gupta
2020-03-31 22:48         ` Joseph Myers
2020-04-01  0:44           ` __syscall_error (was Re: [PATCH v4 13/15] ARC: Build Infrastructure) Vineet Gupta
2020-04-01  7:58             ` Andreas Schwab
2020-04-01 21:38               ` Vineet Gupta
2020-04-01 17:06             ` Joseph Myers
2020-04-02  0:00               ` Vineet Gupta
2020-04-02  8:50               ` Florian Weimer
2020-04-02 20:22                 ` Vineet Gupta
2020-03-13  3:04 ` [PATCH v4 14/15] build-many-glibcs.py: Enable ARC builds Vineet Gupta
2020-03-13  3:04 ` [PATCH v4 15/15] Documentation for ARC port Vineet Gupta
2020-03-27 22:49   ` Joseph Myers
2020-03-27 23:56     ` Vineet Gupta
2020-03-28  0:01       ` Joseph Myers

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