1 files changed, 45 insertions, 0 deletions
diff --git a/arch/powerpc/math-emu/fcmpu.c b/arch/powerpc/math-emu/fcmpu.c
new file mode 100644
index 000000000..65631fa5d
--- /dev/null
+++ b/arch/powerpc/math-emu/fcmpu.c
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/uaccess.h>
+
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/double.h>
+
+int
+fcmpu(u32 *ccr, int crfD, void *frA, void *frB)
+{
+	FP_DECL_D(A);
+	FP_DECL_D(B);
+	FP_DECL_EX;
+	int code[4] = { (1 << 3), (1 << 1), (1 << 2), (1 << 0) };
+	long cmp;
+
+#ifdef DEBUG
+	printk("%s: %p (%08x) %d %p %p\n", __func__, ccr, *ccr, crfD, frA, frB);
+#endif
+
+	FP_UNPACK_DP(A, frA);
+	FP_UNPACK_DP(B, frB);
+
+#ifdef DEBUG
+	printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
+	printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
+#endif
+
+	FP_CMP_D(cmp, A, B, 2);
+	cmp = code[(cmp + 1) & 3];
+
+	__FPU_FPSCR &= ~(0x1f000);
+	__FPU_FPSCR |= (cmp << 12);
+
+	*ccr &= ~(15 << ((7 - crfD) << 2));
+	*ccr |= (cmp << ((7 - crfD) << 2));
+
+#ifdef DEBUG
+	printk("CR: %08x\n", *ccr);
+#endif
+
+	return 0;
+}