[MIPS] Fix optimization for size build.
It took a while longer than on other architectures but gcc has finally
started to strike us as well ...
This also fixes the damage by 6edfba1b33c701108717f4e036320fc39abe1912.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index 133900a..aa37ae6 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -83,6 +83,8 @@
LDFLAGS_vmlinux += -G 0 -static -n -nostdlib
MODFLAGS += -mlong-calls
+cflags-y += -ffreestanding
+
#
# We explicitly add the endianness specifier if needed, this allows
# to compile kernels with a toolchain for the other endianness. We
diff --git a/arch/mips/lib/Makefile b/arch/mips/lib/Makefile
index cf12caf..b225543 100644
--- a/arch/mips/lib/Makefile
+++ b/arch/mips/lib/Makefile
@@ -7,4 +7,7 @@
obj-y += iomap.o
+# libgcc-style stuff needed in the kernel
+lib-y += ashldi3.o ashrdi3.o lshrdi3.o
+
EXTRA_AFLAGS := $(CFLAGS)
diff --git a/arch/mips/lib/ashldi3.c b/arch/mips/lib/ashldi3.c
new file mode 100644
index 0000000..beb80f31
--- /dev/null
+++ b/arch/mips/lib/ashldi3.c
@@ -0,0 +1,29 @@
+#include <linux/module.h>
+
+#include "libgcc.h"
+
+long long __ashldi3(long long u, word_type b)
+{
+ DWunion uu, w;
+ word_type bm;
+
+ if (b == 0)
+ return u;
+
+ uu.ll = u;
+ bm = 32 - b;
+
+ if (bm <= 0) {
+ w.s.low = 0;
+ w.s.high = (unsigned int) uu.s.low << -bm;
+ } else {
+ const unsigned int carries = (unsigned int) uu.s.low >> bm;
+
+ w.s.low = (unsigned int) uu.s.low << b;
+ w.s.high = ((unsigned int) uu.s.high << b) | carries;
+ }
+
+ return w.ll;
+}
+
+EXPORT_SYMBOL(__ashldi3);
diff --git a/arch/mips/lib/ashrdi3.c b/arch/mips/lib/ashrdi3.c
new file mode 100644
index 0000000..c884a91
--- /dev/null
+++ b/arch/mips/lib/ashrdi3.c
@@ -0,0 +1,31 @@
+#include <linux/module.h>
+
+#include "libgcc.h"
+
+long long __ashrdi3(long long u, word_type b)
+{
+ DWunion uu, w;
+ word_type bm;
+
+ if (b == 0)
+ return u;
+
+ uu.ll = u;
+ bm = 32 - b;
+
+ if (bm <= 0) {
+ /* w.s.high = 1..1 or 0..0 */
+ w.s.high =
+ uu.s.high >> 31;
+ w.s.low = uu.s.high >> -bm;
+ } else {
+ const unsigned int carries = (unsigned int) uu.s.high << bm;
+
+ w.s.high = uu.s.high >> b;
+ w.s.low = ((unsigned int) uu.s.low >> b) | carries;
+ }
+
+ return w.ll;
+}
+
+EXPORT_SYMBOL(__ashrdi3);
diff --git a/arch/mips/lib/libgcc.h b/arch/mips/lib/libgcc.h
new file mode 100644
index 0000000..3f19d1c
--- /dev/null
+++ b/arch/mips/lib/libgcc.h
@@ -0,0 +1,26 @@
+#ifndef __ASM_LIBGCC_H
+#define __ASM_LIBGCC_H
+
+#include <asm/byteorder.h>
+
+typedef int word_type __attribute__ ((mode (__word__)));
+
+#ifdef __BIG_ENDIAN
+struct DWstruct {
+ int high, low;
+};
+#elif defined(__LITTLE_ENDIAN)
+struct DWstruct {
+ int low, high;
+};
+#else
+#error I feel sick.
+#endif
+
+typedef union
+{
+ struct DWstruct s;
+ long long ll;
+} DWunion;
+
+#endif /* __ASM_LIBGCC_H */
diff --git a/arch/mips/lib/lshrdi3.c b/arch/mips/lib/lshrdi3.c
new file mode 100644
index 0000000..dcf8d68
--- /dev/null
+++ b/arch/mips/lib/lshrdi3.c
@@ -0,0 +1,29 @@
+#include <linux/module.h>
+
+#include "libgcc.h"
+
+long long __lshrdi3(long long u, word_type b)
+{
+ DWunion uu, w;
+ word_type bm;
+
+ if (b == 0)
+ return u;
+
+ uu.ll = u;
+ bm = 32 - b;
+
+ if (bm <= 0) {
+ w.s.high = 0;
+ w.s.low = (unsigned int) uu.s.high >> -bm;
+ } else {
+ const unsigned int carries = (unsigned int) uu.s.high << bm;
+
+ w.s.high = (unsigned int) uu.s.high >> b;
+ w.s.low = ((unsigned int) uu.s.low >> b) | carries;
+ }
+
+ return w.ll;
+}
+
+EXPORT_SYMBOL(__lshrdi3);