m68k: add private libgcc ashrdi3

Add ashrdi3.c to private libgcc.

Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>

diff --git a/arch/m68k/lib/Makefile b/arch/m68k/lib/Makefile
index b66d66afd2923f7932ef7cccf13f6affbcb0ad1c..6e1fd938f526aeb21e07a4a21f39a42b4f9cd1c3 100644 (file)
--- a/arch/m68k/lib/Makefile
+++ b/arch/m68k/lib/Makefile
@@ -5,7 +5,7 @@
 
 ## Build a couple of necessary functions into a private libgcc
 ## if the user asked for it
-lib-$(CONFIG_USE_PRIVATE_LIBGCC) += lshrdi3.o muldi3.o ashldi3.o
+lib-$(CONFIG_USE_PRIVATE_LIBGCC) += lshrdi3.o muldi3.o ashldi3.o ashrdi3.o
 
 obj-y  += bdinfo.o
 obj-$(CONFIG_CMD_BOOTM) += bootm.o

diff --git a/arch/m68k/lib/ashrdi3.c b/arch/m68k/lib/ashrdi3.c
new file mode 100644 (file)
index 0000000..e144378
--- /dev/null
+++ b/arch/m68k/lib/ashrdi3.c
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * ashrdi3.c extracted from gcc-2.7.2/libgcc2.c which is:
+ * Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
+ */
+
+#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;
+} di_union;
+
+DItype __ashrdi3(DItype u, word_type b)
+{
+       di_union w;
+       word_type bm;
+       di_union uu;
+
+       if (b == 0)
+               return u;
+
+       uu.ll = u;
+
+       bm = (sizeof(SItype) * BITS_PER_UNIT) - b;
+       if (bm <= 0) {
+               /* w.s.high = 1..1 or 0..0 */
+               w.s.high = uu.s.high >> (sizeof(SItype) * BITS_PER_UNIT - 1);
+               w.s.low = uu.s.high >> -bm;
+       } else {
+               USItype carries = (USItype)uu.s.high << bm;
+
+               w.s.high = uu.s.high >> b;
+               w.s.low = ((USItype)uu.s.low >> b) | carries;
+       }
+
+       return w.ll;
+}
+