Add an implementation of __aeabi_ldivmode() and __aeabi_uldivmod(); clang

generates calls to these functions when compiling an armv7 kernel.

Code from NetBSD's unified userland+kernel implementation, with lots of
irrelevant (for us) #ifdefs removed.

ok patrick@, guenther@

2 files changed, 183 insertions, 0 deletions

diff --git a/sys/lib/libkern/arch/arm/__aeabi_ldivmod.S b/sys/lib/libkern/arch/arm/__aeabi_ldivmod.S
new file mode 100644
index 00000000000..c718d848fd4
--- /dev/null
+++ b/sys/lib/libkern/arch/arm/__aeabi_ldivmod.S
@@ -0,0 +1,133 @@
+/*-
+ * Copyright (c) 2012 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Matt Thomas of 3am Software Foundry.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <machine/asm.h>
+
+#ifdef __ARMEB__
+#define	ALO	r1	/* incoming numerator, outgoing quotient */
+#define	AHI	r0	/* incoming numerator, outgoing quotient */
+#define	BLO	r3	/* incoming denominator, outgoing remainder */
+#define	BHI	r2	/* incoming denominator, outgoing remainder */
+#else
+#define	ALO	r0	/* incoming numerator, outgoing quotient */
+#define	AHI	r1	/* incoming numerator, outgoing quotient */
+#define	BLO	r2	/* incoming denominator, outgoing remainder */
+#define	BHI	r3	/* incoming denominator, outgoing remainder */
+#endif
+
+ENTRY(__aeabi_ldivmod)
+	push	{r4-r6, lr}
+#define	NEG	r5
+	movs	NEG, #0
+
+	cmp	BHI, #0
+	bge	2f
+	movs	NEG, #1		/* flip quotient sign */
+	bl	.Lnegate_b
+	bcs	.Lmaxdenom
+
+2:
+	cmp	AHI, #0
+	eorlt	NEG, NEG, #3	/* flip quotient sign, flip remainder sign */
+	bllt	.Lnegate_a
+
+	/*
+	 * Arguments are setup, allocate some stack for the remainder
+	 * and call __qdivrem for the heavy lifting.
+	 */
+	sub	sp, sp, #16
+	adds	r4, sp, #8
+	str	r4, [sp]
+	bl	__qdivrem
+	add	sp, sp, #8
+
+	/*
+	 * The quotient is already in the right place and neither value
+	 * needs its sign flipped.
+	 */
+	cmp	NEG, #0		/* any signs to flip? */
+	beq	.Lnegate_neither
+
+	cmp	NEG, #2		/* does remainder need to be negative? */
+	beq	.Lnegate_b_only	/* 2 means b only */
+	bgt	.Lnegate_both	/* 3 means both */
+.Lnegate_a_only:
+	bl	.Lnegate_a	/* 1 means a only */
+.Lnegate_neither:
+	pop	{r2-r6, pc}	/* grab b from stack */
+.Lnegate_both:
+	bl	.Lnegate_a
+.Lnegate_b_only:
+	pop	{r2-r3}		/* get remainder */
+	bl	.Lnegate_b	/* negate it */
+	pop	{r4-r6, pc}
+
+	.align	0
+.Lnegate_a:
+	negs	ALO, ALO
+	rsc	AHI, AHI, #0
+	mov	pc, lr
+
+	.align	0
+.Lnegate_b:
+	negs	BLO, BLO
+	rsc	BHI, BHI, #0
+	mov	pc, lr
+
+	.align	0
+.Lmaxdenom:
+	/*
+	 * We had a carry so the denominator must have INT64_MIN
+	 * Also BLO and BHI never changed values so we can use
+	 * them to see if the numerator has the same value.  We
+	 * don't have to worry about sign.
+	 */
+	cmp	BHI, AHI
+	cmpeq	BLO, ALO
+	bne	1f
+
+	/*
+	 * They were equal, so we return a quotient of 1 and remainder of 0.
+	 */
+	movs	ALO, #1
+	movs	AHI, #0
+	movs	BLO, #0
+	movs	BHI, #0
+	pop	{r4-r6, pc}
+
+	/*
+	 * Our remainder must be the numerator and our quotient is 0.
+	 */
+	.align	0
+1:	movs	BLO, ALO
+	movs	BHI, AHI
+	movs	ALO, #0
+	movs	AHI, #0
+	pop	{r4-r6, pc}
+END(__aeabi_ldivmod)
diff --git a/sys/lib/libkern/arch/arm/__aeabi_uldivmod.S b/sys/lib/libkern/arch/arm/__aeabi_uldivmod.S
new file mode 100644
index 00000000000..118470e6436
--- /dev/null
+++ b/sys/lib/libkern/arch/arm/__aeabi_uldivmod.S
@@ -0,0 +1,50 @@
+/*-
+ * Copyright (c) 2012 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Matt Thomas of 3am Software Foundry.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <machine/asm.h>
+
+/*
+ * typedef struct { unsigned long long quo, rem } ulldiv_t;
+ * __value_in_regs ulldiv_t __aeabi_uldivmod(unsigned long long n,
+ *	unsigned long long d);
+ */
+
+ENTRY(__aeabi_uldivmod)
+	push	{r4,lr}
+	sub	sp, sp, #16
+	add	r4, sp, #8
+	str	r4, [sp]
+	bl	__qdivrem
+	add	sp, sp, #8
+	/*
+	 * The remainder is already on the stack just waiting to be popped
+	 * into r2/r3.
+	 */
+	pop	{r2-r4,pc}
+END(__aeabi_uldivmod)