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-rw-r--r--arch/powerpc/math-emu/fdiv.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/arch/powerpc/math-emu/fdiv.c b/arch/powerpc/math-emu/fdiv.c
new file mode 100644
index 0000000000..6e64ece2d3
--- /dev/null
+++ b/arch/powerpc/math-emu/fdiv.c
@@ -0,0 +1,57 @@
+// 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
+fdiv(void *frD, void *frA, void *frB)
+{
+ FP_DECL_D(A);
+ FP_DECL_D(B);
+ FP_DECL_D(R);
+ FP_DECL_EX;
+
+#ifdef DEBUG
+ printk("%s: %p %p %p\n", __func__, frD, 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
+
+ if (A_c == FP_CLS_ZERO && B_c == FP_CLS_ZERO) {
+ FP_SET_EXCEPTION(EFLAG_VXZDZ);
+#ifdef DEBUG
+ printk("%s: FPSCR_VXZDZ raised\n", __func__);
+#endif
+ }
+ if (A_c == FP_CLS_INF && B_c == FP_CLS_INF) {
+ FP_SET_EXCEPTION(EFLAG_VXIDI);
+#ifdef DEBUG
+ printk("%s: FPSCR_VXIDI raised\n", __func__);
+#endif
+ }
+
+ if (B_c == FP_CLS_ZERO && A_c != FP_CLS_ZERO) {
+ FP_SET_EXCEPTION(EFLAG_DIVZERO);
+ if (__FPU_TRAP_P(EFLAG_DIVZERO))
+ return FP_CUR_EXCEPTIONS;
+ }
+ FP_DIV_D(R, A, B);
+
+#ifdef DEBUG
+ printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
+#endif
+
+ __FP_PACK_D(frD, R);
+
+ return FP_CUR_EXCEPTIONS;
+}