3 files changed, 243 insertions, 0 deletions
diff --git a/lib/isc/x86_32/include/Makefile.in b/lib/isc/x86_32/include/Makefile.in
new file mode 100644
index 0000000..d33c0fc
--- /dev/null
+++ b/lib/isc/x86_32/include/Makefile.in
@@ -0,0 +1,17 @@
+# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+# See the COPYRIGHT file distributed with this work for additional
+# information regarding copyright ownership.
+
+srcdir =	@srcdir@
+VPATH =		@srcdir@
+top_srcdir =	@top_srcdir@
+
+SUBDIRS =	isc
+TARGETS =
+
+@BIND9_MAKE_RULES@
diff --git a/lib/isc/x86_32/include/isc/Makefile.in b/lib/isc/x86_32/include/isc/Makefile.in
new file mode 100644
index 0000000..97b6b41
--- /dev/null
+++ b/lib/isc/x86_32/include/isc/Makefile.in
@@ -0,0 +1,34 @@
+# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+# See the COPYRIGHT file distributed with this work for additional
+# information regarding copyright ownership.
+
+srcdir =	@srcdir@
+VPATH =		@srcdir@
+top_srcdir =	@top_srcdir@
+
+VERSION=@BIND9_VERSION@
+
+HEADERS =	atomic.h
+
+SUBDIRS =
+TARGETS =
+
+@BIND9_MAKE_RULES@
+
+installdirs:
+	$(SHELL) ${top_srcdir}/mkinstalldirs ${DESTDIR}${includedir}/isc
+
+install:: installdirs
+	for i in ${HEADERS}; do \
+		${INSTALL_DATA} $(srcdir)/$$i ${DESTDIR}${includedir}/isc || exit 1; \
+	done
+
+uninstall::
+	for i in ${HEADERS}; do \
+		rm -f ${DESTDIR}${includedir}/isc/$$i || exit 1; \
+	done
diff --git a/lib/isc/x86_32/include/isc/atomic.h b/lib/isc/x86_32/include/isc/atomic.h
new file mode 100644
index 0000000..8bcc8b0
--- /dev/null
+++ b/lib/isc/x86_32/include/isc/atomic.h
@@ -0,0 +1,192 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+#ifndef ISC_ATOMIC_H
+#define ISC_ATOMIC_H 1
+
+#include <inttypes.h>
+
+#include <isc/platform.h>
+#include <isc/types.h>
+
+#ifdef ISC_PLATFORM_USEGCCASM
+/*
+ * This routine atomically increments the value stored in 'p' by 'val', and
+ * returns the previous value.
+ */
+static __inline__ int32_t
+isc_atomic_xadd(int32_t *p, int32_t val) {
+	int32_t prev = val;
+
+	__asm__ volatile(
+#ifdef ISC_PLATFORM_USETHREADS
+		"lock;"
+#endif
+		"xadd %0, %1"
+		:"=q"(prev)
+		:"m"(*p), "0"(prev)
+		:"memory", "cc");
+
+	return (prev);
+}
+
+#ifdef ISC_PLATFORM_HAVEXADDQ
+static __inline__ int64_t
+isc_atomic_xaddq(int64_t *p, int64_t val) {
+	int64_t prev = val;
+
+	__asm__ volatile(
+#ifdef ISC_PLATFORM_USETHREADS
+	    "lock;"
+#endif
+	    "xaddq %0, %1"
+	    :"=q"(prev)
+	    :"m"(*p), "0"(prev)
+	    :"memory", "cc");
+
+	return (prev);
+}
+#endif /* ISC_PLATFORM_HAVEXADDQ */
+
+/*
+ * This routine atomically stores the value 'val' in 'p' (32-bit version).
+ */
+static __inline__ void
+isc_atomic_store(int32_t *p, int32_t val) {
+	__asm__ volatile(
+#ifdef ISC_PLATFORM_USETHREADS
+		/*
+		 * xchg should automatically lock memory, but we add it
+		 * explicitly just in case (it at least doesn't harm)
+		 */
+		"lock;"
+#endif
+
+		"xchgl %1, %0"
+		:
+		: "r"(val), "m"(*p)
+		: "memory");
+}
+
+#ifdef ISC_PLATFORM_HAVEATOMICSTOREQ
+/*
+ * This routine atomically stores the value 'val' in 'p' (64-bit version).
+ */
+static __inline__ void
+isc_atomic_storeq(int64_t *p, int64_t val) {
+	__asm__ volatile(
+#ifdef ISC_PLATFORM_USETHREADS
+		/*
+		 * xchg should automatically lock memory, but we add it
+		 * explicitly just in case (it at least doesn't harm)
+		 */
+		"lock;"
+#endif
+
+		"xchgq %1, %0"
+		:
+		: "r"(val), "m"(*p)
+		: "memory");
+}
+#endif /* ISC_PLATFORM_HAVEATOMICSTOREQ */
+
+/*
+ * This routine atomically replaces the value in 'p' with 'val', if the
+ * original value is equal to 'cmpval'.  The original value is returned in any
+ * case.
+ */
+static __inline__ int32_t
+isc_atomic_cmpxchg(int32_t *p, int32_t cmpval, int32_t val) {
+	__asm__ volatile(
+#ifdef ISC_PLATFORM_USETHREADS
+		"lock;"
+#endif
+		"cmpxchgl %1, %2"
+		: "=a"(cmpval)
+		: "r"(val), "m"(*p), "a"(cmpval)
+		: "memory");
+
+	return (cmpval);
+}
+
+#elif defined(ISC_PLATFORM_USESTDASM)
+/*
+ * The followings are "generic" assembly code which implements the same
+ * functionality in case the gcc extension cannot be used.  It should be
+ * better to avoid inlining below, since we directly refer to specific
+ * positions of the stack frame, which would not actually point to the
+ * intended address in the embedded mnemonic.
+ */
+static int32_t
+isc_atomic_xadd(int32_t *p, int32_t val) {
+	(void)(p);
+	(void)(val);
+
+	__asm (
+		"movl 8(%ebp), %ecx\n"
+		"movl 12(%ebp), %edx\n"
+#ifdef ISC_PLATFORM_USETHREADS
+		"lock;"
+#endif
+		"xadd %edx, (%ecx)\n"
+
+		/*
+		 * set the return value directly in the register so that we
+		 * can avoid guessing the correct position in the stack for a
+		 * local variable.
+		 */
+		"movl %edx, %eax"
+		);
+}
+
+static void
+isc_atomic_store(int32_t *p, int32_t val) {
+	(void)(p);
+	(void)(val);
+
+	__asm (
+		"movl 8(%ebp), %ecx\n"
+		"movl 12(%ebp), %edx\n"
+#ifdef ISC_PLATFORM_USETHREADS
+		"lock;"
+#endif
+		"xchgl (%ecx), %edx\n"
+		);
+}
+
+static int32_t
+isc_atomic_cmpxchg(int32_t *p, int32_t cmpval, int32_t val) {
+	(void)(p);
+	(void)(cmpval);
+	(void)(val);
+
+	__asm (
+		"movl 8(%ebp), %ecx\n"
+		"movl 12(%ebp), %eax\n"	/* must be %eax for cmpxchgl */
+		"movl 16(%ebp), %edx\n"
+#ifdef ISC_PLATFORM_USETHREADS
+		"lock;"
+#endif
+
+		/*
+		 * If (%ecx) == %eax then (%ecx) := %edx.
+		 % %eax is set to old (%ecx), which will be the return value.
+		 */
+		"cmpxchgl %edx, (%ecx)"
+		);
+}
+#else /* !ISC_PLATFORM_USEGCCASM && !ISC_PLATFORM_USESTDASM */
+
+#error "unsupported compiler.  disable atomic ops by --disable-atomic"
+
+#endif
+#endif /* ISC_ATOMIC_H */