[PATCH 11/17] RISC-V: Atomic and Locking Routines

[Palmer Dabbelt <palmer at dabbelt dot com>]

This patch implements various atomic and locking routines on RISC-V.  We
mandate the A extension on Linux-capable RISC-V systems, so this can
rely on always having the various atomic instructions availiable.
---
 sysdeps/riscv/nptl/bits/pthreadtypes-arch.h    |  76 ++++++++++
 sysdeps/riscv/nptl/bits/semaphore.h            |  33 +++++
 sysdeps/riscv/nptl/libc-lowlevellock.c         |   8 +
 sysdeps/unix/sysv/linux/riscv/atomic-machine.h | 194 +++++++++++++++++++++++++
 4 files changed, 311 insertions(+)
 create mode 100644 sysdeps/riscv/nptl/bits/pthreadtypes-arch.h
 create mode 100644 sysdeps/riscv/nptl/bits/semaphore.h
 create mode 100644 sysdeps/riscv/nptl/libc-lowlevellock.c
 create mode 100644 sysdeps/unix/sysv/linux/riscv/atomic-machine.h

diff --git a/sysdeps/riscv/nptl/bits/pthreadtypes-arch.h b/sysdeps/riscv/nptl/bits/pthreadtypes-arch.h
new file mode 100644
index 000000000000..3642ff644979
--- /dev/null
+++ b/sysdeps/riscv/nptl/bits/pthreadtypes-arch.h
@@ -0,0 +1,76 @@
+/* Machine-specific pthread type layouts.  RISC-V version.
+   Copyright (C) 2011-2018 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
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _BITS_PTHREADTYPES_ARCH_H
+#define _BITS_PTHREADTYPES_ARCH_H	1
+
+#include <endian.h>
+
+#if __riscv_xlen == 64
+# define __SIZEOF_PTHREAD_ATTR_T 		56
+# define __SIZEOF_PTHREAD_MUTEX_T 		40
+# define __SIZEOF_PTHREAD_MUTEXATTR_T 		 4
+# define __SIZEOF_PTHREAD_COND_T 		48
+# define __SIZEOF_PTHREAD_CONDATTR_T 		 4
+# define __SIZEOF_PTHREAD_RWLOCK_T 		56
+# define __SIZEOF_PTHREAD_RWLOCKATTR_T 		 8
+# define __SIZEOF_PTHREAD_BARRIER_T 		32
+# define __SIZEOF_PTHREAD_BARRIERATTR_T 	 4
+#else
+# define __SIZEOF_PTHREAD_ATTR_T 		32
+# define __SIZEOF_PTHREAD_MUTEX_T 		32
+# define __SIZEOF_PTHREAD_MUTEXATTR_T 		 4
+# define __SIZEOF_PTHREAD_COND_T 		48
+# define __SIZEOF_PTHREAD_CONDATTR_T 		 4
+# define __SIZEOF_PTHREAD_RWLOCK_T 		48
+# define __SIZEOF_PTHREAD_RWLOCKATTR_T 		 8
+# define __SIZEOF_PTHREAD_BARRIER_T 		20
+# define __SIZEOF_PTHREAD_BARRIERATTR_T 	 4
+#endif
+
+#define __PTHREAD_COMPAT_PADDING_MID
+#define __PTHREAD_COMPAT_PADDING_END
+#define __PTHREAD_MUTEX_LOCK_ELISION		0
+#define __PTHREAD_MUTEX_USE_UNION	 	0
+#define __PTHREAD_MUTEX_NUSERS_AFTER_KIND	0
+
+#define __LOCK_ALIGNMENT
+#define __ONCE_ALIGNMENT
+
+/* There is a lot of padding in this structure.  While it's not strictly
+   necessary on RISC-V, we're going to leave it in to be on the safe side in
+   case it's needed in the future.  Most other architectures have the padding,
+   so this gives us the same extensibility as everyone else has.  */
+struct __pthread_rwlock_arch_t
+{
+  unsigned int __readers;
+  unsigned int __writers;
+  unsigned int __wrphase_futex;
+  unsigned int __writers_futex;
+  unsigned int __pad3;
+  unsigned int __pad4;
+  int __cur_writer;
+  int __shared;
+  unsigned long int __pad1;
+  unsigned long int __pad2;
+  unsigned int __flags;
+};
+
+#define __PTHREAD_RWLOCK_ELISION_EXTRA 		0
+
+#endif	/* bits/pthreadtypes.h */
diff --git a/sysdeps/riscv/nptl/bits/semaphore.h b/sysdeps/riscv/nptl/bits/semaphore.h
new file mode 100644
index 000000000000..2fed17d0e530
--- /dev/null
+++ b/sysdeps/riscv/nptl/bits/semaphore.h
@@ -0,0 +1,33 @@
+/* Machine-specific POSIX semaphore type layouts.  RISC-V version.
+   Copyright (C) 2002-2018 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
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _SEMAPHORE_H
+# error "Never use <bits/semaphore.h> directly; include <semaphore.h> instead."
+#endif
+
+#define __SIZEOF_SEM_T	(4 * __SIZEOF_POINTER__)
+
+/* Value returned if `sem_open' failed.  */
+#define SEM_FAILED      ((sem_t *) 0)
+
+
+typedef union
+{
+  char __size[__SIZEOF_SEM_T];
+  long int __align;
+} sem_t;
diff --git a/sysdeps/riscv/nptl/libc-lowlevellock.c b/sysdeps/riscv/nptl/libc-lowlevellock.c
new file mode 100644
index 000000000000..9523fb46a596
--- /dev/null
+++ b/sysdeps/riscv/nptl/libc-lowlevellock.c
@@ -0,0 +1,8 @@
+/* This kludge works around a libpthread static linking problem:
+   https://sourceware.org/bugzilla/show_bug.cgi?id=15648.  */
+
+#ifndef SHARED
+# define __lll_lock_wait_private weak_function __lll_lock_wait_private
+#endif
+
+#include <lowlevellock.c>
diff --git a/sysdeps/unix/sysv/linux/riscv/atomic-machine.h b/sysdeps/unix/sysv/linux/riscv/atomic-machine.h
new file mode 100644
index 000000000000..3d967d3b08f0
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/atomic-machine.h
@@ -0,0 +1,194 @@
+/* Low-level functions for atomic operations. RISC-V version.
+   Copyright (C) 2014-2018 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
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _LINUX_RISCV_BITS_ATOMIC_H
+#define _LINUX_RISCV_BITS_ATOMIC_H 1
+
+#include <stdint.h>
+
+typedef int32_t atomic32_t;
+typedef uint32_t uatomic32_t;
+
+typedef int64_t atomic64_t;
+typedef uint64_t uatomic64_t;
+
+typedef intptr_t atomicptr_t;
+typedef uintptr_t uatomicptr_t;
+typedef intmax_t atomic_max_t;
+typedef uintmax_t uatomic_max_t;
+
+#define atomic_full_barrier() __sync_synchronize ()
+
+#ifdef __riscv_atomic
+
+# define __HAVE_64B_ATOMICS (__riscv_xlen >= 64)
+# define USE_ATOMIC_COMPILER_BUILTINS 1
+# define ATOMIC_EXCHANGE_USES_CAS 0
+
+/* Compare and exchange.
+   For all "bool" routines, we return FALSE if exchange succesful.  */
+
+# define __arch_compare_and_exchange_bool_8_int(mem, newval, oldval, model) \
+  ({									\
+    typeof (*mem) __oldval = (oldval);					\
+    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
+				  model, __ATOMIC_RELAXED);		\
+  })
+
+# define __arch_compare_and_exchange_bool_16_int(mem, newval, oldval, model) \
+  ({									\
+    typeof (*mem) __oldval = (oldval);					\
+    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
+				  model, __ATOMIC_RELAXED);		\
+  })
+
+# define __arch_compare_and_exchange_bool_32_int(mem, newval, oldval, model) \
+  ({									\
+    typeof (*mem) __oldval = (oldval);					\
+    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
+				  model, __ATOMIC_RELAXED);		\
+  })
+
+#  define __arch_compare_and_exchange_bool_64_int(mem, newval, oldval, model) \
+  ({									\
+    typeof (*mem) __oldval = (oldval);					\
+    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
+				  model, __ATOMIC_RELAXED);		\
+  })
+
+# define __arch_compare_and_exchange_val_8_int(mem, newval, oldval, model) \
+  ({									\
+    typeof (*mem) __oldval = (oldval);					\
+    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
+				 model, __ATOMIC_RELAXED);		\
+    __oldval;								\
+  })
+
+# define __arch_compare_and_exchange_val_16_int(mem, newval, oldval, model) \
+  ({									\
+    typeof (*mem) __oldval = (oldval);					\
+    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
+				 model, __ATOMIC_RELAXED);		\
+    __oldval;								\
+  })
+
+# 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 __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model) \
+  ({									\
+    typeof (*mem) __oldval = (oldval);					\
+    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
+				 model, __ATOMIC_RELAXED);		\
+    __oldval;								\
+  })
+
+/* Atomic compare and exchange.  */
+
+# define atomic_compare_and_exchange_bool_acq(mem, new, old)	\
+  __atomic_bool_bysize (__arch_compare_and_exchange_bool, int,	\
+			mem, new, old, __ATOMIC_ACQUIRE)
+
+# define atomic_compare_and_exchange_val_acq(mem, new, old)	\
+  __atomic_val_bysize (__arch_compare_and_exchange_val, int,	\
+		       mem, new, old, __ATOMIC_ACQUIRE)
+
+# define atomic_compare_and_exchange_val_rel(mem, new, old)	 \
+  __atomic_val_bysize (__arch_compare_and_exchange_val, int,    \
+                       mem, new, old, __ATOMIC_RELEASE)
+
+/* Atomic exchange (without compare).  */
+
+# define __arch_exchange_8_int(mem, newval, model)	\
+  __atomic_exchange_n (mem, newval, model)
+
+# define __arch_exchange_16_int(mem, newval, model)	\
+  __atomic_exchange_n (mem, newval, model)
+
+# define __arch_exchange_32_int(mem, newval, model)	\
+  __atomic_exchange_n (mem, newval, model)
+
+#  define __arch_exchange_64_int(mem, newval, model)	\
+  __atomic_exchange_n (mem, newval, model)
+
+# define atomic_exchange_acq(mem, value)				\
+  __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_ACQUIRE)
+
+# define atomic_exchange_rel(mem, value)				\
+  __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_RELEASE)
+
+/* Atomically add value and return the previous (unincremented) value.  */
+
+# define __arch_exchange_and_add_8_int(mem, value, model)	\
+  __atomic_fetch_add (mem, value, model)
+
+# define __arch_exchange_and_add_16_int(mem, value, model)	\
+  __atomic_fetch_add (mem, value, model)
+
+# define __arch_exchange_and_add_32_int(mem, value, model)	\
+  __atomic_fetch_add (mem, value, model)
+
+#  define __arch_exchange_and_add_64_int(mem, value, model)	\
+  __atomic_fetch_add (mem, value, model)
+
+# define atomic_exchange_and_add_acq(mem, value)			\
+  __atomic_val_bysize (__arch_exchange_and_add, int, mem, value,	\
+		       __ATOMIC_ACQUIRE)
+
+# define atomic_exchange_and_add_rel(mem, value)			\
+  __atomic_val_bysize (__arch_exchange_and_add, int, mem, value,	\
+		       __ATOMIC_RELEASE)
+
+/* Miscellaneous.  */
+
+# define asm_amo(which, ordering, mem, value) ({ 		\
+  __atomic_check_size (mem);					\
+  typeof (*mem) __tmp; 						\
+  if (sizeof (__tmp) == 4)					\
+    asm volatile (which ".w" ordering "\t%0, %z2, %1"		\
+		  : "=r" (__tmp), "+A" (* (mem))		\
+		  : "rJ" (value));				\
+  else if (sizeof (__tmp) == 8)					\
+    asm volatile (which ".d" ordering "\t%0, %z2, %1"		\
+		  : "=r" (__tmp), "+A" (* (mem))		\
+		  : "rJ" (value));				\
+  else								\
+    abort ();							\
+  __tmp; })
+
+# define atomic_max(mem, value) asm_amo ("amomaxu", ".aq", mem, value)
+# define atomic_min(mem, value) asm_amo ("amominu", ".aq", mem, value)
+
+# define atomic_bit_test_set(mem, bit)                   \
+  ({ typeof (*mem) __mask = (typeof (*mem))1 << (bit);    \
+     asm_amo ("amoor", ".aq", mem, __mask) & __mask; })
+
+# define catomic_exchange_and_add(mem, value)		\
+  atomic_exchange_and_add (mem, value)
+# define catomic_max(mem, value) atomic_max (mem, value)
+
+#else /* __riscv_atomic */
+# error "ISAs that do not subsume the A extension are not supported"
+#endif /* !__riscv_atomic */
+
+#endif /* bits/atomic.h */
-- 
2.13.6