m68k: add private libgcc

Add private libgcc

Signed-off-by: Angelo Dureghello <angelo@sysam.it>

arch/Kconfig

@@ -40,6 +40,7 @@ config BLACKFIN
 
 config M68K
 	bool "M68000 architecture"
+	select HAVE_PRIVATE_LIBGCC
 	select HAVE_GENERIC_BOARD
 	select SYS_GENERIC_BOARD
 

arch/m68k/lib/Makefile

@@ -5,6 +5,10 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
+## Build a couple of necessary functions into a private libgcc
+## if the user asked for it
+lib-$(CONFIG_USE_PRIVATE_LIBGCC) += lshrdi3.o muldi3.o ashldi3.o
+
 obj-$(CONFIG_CMD_BOOTM) += bootm.o
 obj-y	+= cache.o
 obj-y	+= interrupts.o

arch/m68k/lib/ashldi3.c

@@ -0,0 +1,50 @@
+/*
+ * ashldi3.c extracted from gcc-2.7.2.3/libgcc2.c and
+ *			   gcc-2.7.2.3/longlong.h
+ *
+ * Copyright (C) 1989-2015 Free Software Foundation, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#define BITS_PER_UNIT 8
+
+typedef		 int SItype	__attribute__ ((mode (SI)));
+typedef unsigned int USItype	__attribute__ ((mode (SI)));
+typedef		 int DItype	__attribute__ ((mode (DI)));
+typedef int word_type __attribute__ ((mode (__word__)));
+
+struct DIstruct {SItype high, low;};
+
+typedef union
+{
+  struct DIstruct s;
+  DItype ll;
+} DIunion;
+
+DItype __ashldi3 (DItype u, word_type b)
+{
+	DIunion w;
+	word_type bm;
+	DIunion uu;
+
+	if (b == 0)
+		return u;
+
+	uu.ll = u;
+
+	bm = (sizeof (SItype) * BITS_PER_UNIT) - b;
+	if (bm <= 0)
+	{
+		w.s.low = 0;
+		w.s.high = (USItype)uu.s.low << -bm;
+	}
+	else
+	{
+		USItype carries = (USItype)uu.s.low >> bm;
+		w.s.low = (USItype)uu.s.low << b;
+		w.s.high = ((USItype)uu.s.high << b) | carries;
+	}
+
+	return w.ll;
+}

arch/m68k/lib/lshrdi3.c

@@ -0,0 +1,50 @@
+/*
+ * lshrdi3.c extracted from gcc-2.7.2.3/libgcc2.c and
+ *			   gcc-2.7.2.3/longlong.h
+ *
+ * Copyright (C) 1989-2015 Free Software Foundation, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#define BITS_PER_UNIT 8
+
+typedef		 int SItype	__attribute__ ((mode (SI)));
+typedef unsigned int USItype	__attribute__ ((mode (SI)));
+typedef		 int DItype	__attribute__ ((mode (DI)));
+typedef int word_type __attribute__ ((mode (__word__)));
+
+struct DIstruct {SItype high, low;};
+
+typedef union
+{
+  struct DIstruct s;
+  DItype ll;
+} DIunion;
+
+DItype __lshrdi3 (DItype u, word_type b)
+{
+	DIunion w;
+	word_type bm;
+	DIunion uu;
+
+	if (b == 0)
+		return u;
+
+	uu.ll = u;
+
+	bm = (sizeof (SItype) * BITS_PER_UNIT) - b;
+	if (bm <= 0)
+	{
+		w.s.high = 0;
+		w.s.low = (USItype)uu.s.high >> -bm;
+	}
+	else
+	{
+		USItype carries = (USItype)uu.s.high << bm;
+		w.s.high = (USItype)uu.s.high >> b;
+		w.s.low = ((USItype)uu.s.low >> b) | carries;
+	}
+
+	return w.ll;
+}

arch/m68k/lib/muldi3.c

@@ -0,0 +1,71 @@
+/*
+ * muldi3.c extracted from gcc-2.7.2.3/libgcc2.c and
+ *			   gcc-2.7.2.3/longlong.h
+ *
+ * Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#define SI_TYPE_SIZE 32
+#define __BITS4 (SI_TYPE_SIZE / 4)
+#define __ll_B (1L << (SI_TYPE_SIZE / 2))
+#define __ll_lowpart(t) ((USItype) (t) % __ll_B)
+#define __ll_highpart(t) ((USItype) (t) / __ll_B)
+
+#define umul_ppmm(w1, w0, u, v)						\
+  do {									\
+    USItype __x0, __x1, __x2, __x3;					\
+    USItype __ul, __vl, __uh, __vh;					\
+									\
+    __ul = __ll_lowpart (u);						\
+    __uh = __ll_highpart (u);						\
+    __vl = __ll_lowpart (v);						\
+    __vh = __ll_highpart (v);						\
+									\
+    __x0 = (USItype) __ul * __vl;					\
+    __x1 = (USItype) __ul * __vh;					\
+    __x2 = (USItype) __uh * __vl;					\
+    __x3 = (USItype) __uh * __vh;					\
+									\
+    __x1 += __ll_highpart (__x0);/* this can't give carry */		\
+    __x1 += __x2;		/* but this indeed can */		\
+    if (__x1 < __x2)		/* did we get it? */			\
+      __x3 += __ll_B;		/* yes, add it in the proper pos. */	\
+									\
+    (w1) = __x3 + __ll_highpart (__x1);					\
+    (w0) = __ll_lowpart (__x1) * __ll_B + __ll_lowpart (__x0);		\
+  } while (0)
+
+#define __umulsidi3(u, v) \
+  ({DIunion __w;							\
+    umul_ppmm (__w.s.high, __w.s.low, u, v);				\
+    __w.ll; })
+
+typedef 	 int SItype	__attribute__ ((mode (SI)));
+typedef unsigned int USItype	__attribute__ ((mode (SI)));
+typedef		 int DItype	__attribute__ ((mode (DI)));
+typedef int word_type __attribute__ ((mode (__word__)));
+
+struct DIstruct {SItype high, low;};
+
+typedef union
+{
+	struct DIstruct s;
+	DItype ll;
+} DIunion;
+
+DItype __muldi3 (DItype u, DItype v)
+{
+	DIunion w;
+	DIunion uu, vv;
+
+	uu.ll = u,
+	vv.ll = v;
+
+	w.ll = __umulsidi3 (uu.s.low, vv.s.low);
+	w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high
+		+ (USItype) uu.s.high * (USItype) vv.s.low);
+
+	return w.ll;
+}