1 files changed, 155 insertions, 0 deletions
diff --git a/arch/arm/nwfpe/double_cpdo.c b/arch/arm/nwfpe/double_cpdo.c
new file mode 100644
index 0000000000..344bb7c461
--- /dev/null
+++ b/arch/arm/nwfpe/double_cpdo.c
@@ -0,0 +1,155 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+    NetWinder Floating Point Emulator
+    (c) Rebel.COM, 1998,1999
+
+    Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
+
+*/
+
+#include "fpa11.h"
+#include "softfloat.h"
+#include "fpopcode.h"
+
+union float64_components {
+	float64 f64;
+	unsigned int i[2];
+};
+
+float64 float64_exp(float64 Fm);
+float64 float64_ln(float64 Fm);
+float64 float64_sin(float64 rFm);
+float64 float64_cos(float64 rFm);
+float64 float64_arcsin(float64 rFm);
+float64 float64_arctan(float64 rFm);
+float64 float64_log(float64 rFm);
+float64 float64_tan(float64 rFm);
+float64 float64_arccos(float64 rFm);
+float64 float64_pow(float64 rFn, float64 rFm);
+float64 float64_pol(float64 rFn, float64 rFm);
+
+static float64 float64_rsf(struct roundingData *roundData, float64 rFn, float64 rFm)
+{
+	return float64_sub(roundData, rFm, rFn);
+}
+
+static float64 float64_rdv(struct roundingData *roundData, float64 rFn, float64 rFm)
+{
+	return float64_div(roundData, rFm, rFn);
+}
+
+static float64 (*const dyadic_double[16])(struct roundingData*, float64 rFn, float64 rFm) = {
+	[ADF_CODE >> 20] = float64_add,
+	[MUF_CODE >> 20] = float64_mul,
+	[SUF_CODE >> 20] = float64_sub,
+	[RSF_CODE >> 20] = float64_rsf,
+	[DVF_CODE >> 20] = float64_div,
+	[RDF_CODE >> 20] = float64_rdv,
+	[RMF_CODE >> 20] = float64_rem,
+
+	/* strictly, these opcodes should not be implemented */
+	[FML_CODE >> 20] = float64_mul,
+	[FDV_CODE >> 20] = float64_div,
+	[FRD_CODE >> 20] = float64_rdv,
+};
+
+static float64 float64_mvf(struct roundingData *roundData,float64 rFm)
+{
+	return rFm;
+}
+
+static float64 float64_mnf(struct roundingData *roundData,float64 rFm)
+{
+	union float64_components u;
+
+	u.f64 = rFm;
+#ifdef __ARMEB__
+	u.i[0] ^= 0x80000000;
+#else
+	u.i[1] ^= 0x80000000;
+#endif
+
+	return u.f64;
+}
+
+static float64 float64_abs(struct roundingData *roundData,float64 rFm)
+{
+	union float64_components u;
+
+	u.f64 = rFm;
+#ifdef __ARMEB__
+	u.i[0] &= 0x7fffffff;
+#else
+	u.i[1] &= 0x7fffffff;
+#endif
+
+	return u.f64;
+}
+
+static float64 (*const monadic_double[16])(struct roundingData *, float64 rFm) = {
+	[MVF_CODE >> 20] = float64_mvf,
+	[MNF_CODE >> 20] = float64_mnf,
+	[ABS_CODE >> 20] = float64_abs,
+	[RND_CODE >> 20] = float64_round_to_int,
+	[URD_CODE >> 20] = float64_round_to_int,
+	[SQT_CODE >> 20] = float64_sqrt,
+	[NRM_CODE >> 20] = float64_mvf,
+};
+
+unsigned int DoubleCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd)
+{
+	FPA11 *fpa11 = GET_FPA11();
+	float64 rFm;
+	unsigned int Fm, opc_mask_shift;
+
+	Fm = getFm(opcode);
+	if (CONSTANT_FM(opcode)) {
+		rFm = getDoubleConstant(Fm);
+	} else {
+		switch (fpa11->fType[Fm]) {
+		case typeSingle:
+			rFm = float32_to_float64(fpa11->fpreg[Fm].fSingle);
+			break;
+
+		case typeDouble:
+			rFm = fpa11->fpreg[Fm].fDouble;
+			break;
+
+		default:
+			return 0;
+		}
+	}
+
+	opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20;
+	if (!MONADIC_INSTRUCTION(opcode)) {
+		unsigned int Fn = getFn(opcode);
+		float64 rFn;
+
+		switch (fpa11->fType[Fn]) {
+		case typeSingle:
+			rFn = float32_to_float64(fpa11->fpreg[Fn].fSingle);
+			break;
+
+		case typeDouble:
+			rFn = fpa11->fpreg[Fn].fDouble;
+			break;
+
+		default:
+			return 0;
+		}
+
+		if (dyadic_double[opc_mask_shift]) {
+			rFd->fDouble = dyadic_double[opc_mask_shift](roundData, rFn, rFm);
+		} else {
+			return 0;
+		}
+	} else {
+		if (monadic_double[opc_mask_shift]) {
+			rFd->fDouble = monadic_double[opc_mask_shift](roundData, rFm);
+		} else {
+			return 0;
+		}
+	}
+
+	return 1;
+}