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Subject[PATCH v2 2/5] nds32: Support FP emulation
Date
Andes FPU hardware does not support denormalized number handling.
From Andes FPU spec, FPU generates a denorm input to require kernel
to deal with this instrution operation when encountering a denormalized
operand. Hence an emulator for nds32 FPU ISA in kernel is needed to
satisfy the requirement.

Signed-off-by: Vincent Chen <vincentc@andestech.com>
---
arch/nds32/Makefile | 1 +
arch/nds32/include/asm/fpu.h | 1 +
arch/nds32/include/asm/fpuemu.h | 32 +++
arch/nds32/include/asm/nds32_fpu_inst.h | 109 ++++++++++
arch/nds32/include/asm/sfp-machine.h | 158 ++++++++++++++
arch/nds32/kernel/fpu.c | 31 +++-
arch/nds32/math-emu/Makefile | 7 +
arch/nds32/math-emu/faddd.c | 24 ++
arch/nds32/math-emu/fadds.c | 24 ++
arch/nds32/math-emu/fcmpd.c | 24 ++
arch/nds32/math-emu/fcmps.c | 24 ++
arch/nds32/math-emu/fd2s.c | 22 ++
arch/nds32/math-emu/fdivd.c | 27 +++
arch/nds32/math-emu/fdivs.c | 26 +++
arch/nds32/math-emu/fmuld.c | 23 ++
arch/nds32/math-emu/fmuls.c | 23 ++
arch/nds32/math-emu/fnegd.c | 21 ++
arch/nds32/math-emu/fnegs.c | 21 ++
arch/nds32/math-emu/fpuemu.c | 361 +++++++++++++++++++++++++++++++
arch/nds32/math-emu/fs2d.c | 23 ++
arch/nds32/math-emu/fsqrtd.c | 21 ++
arch/nds32/math-emu/fsqrts.c | 21 ++
arch/nds32/math-emu/fsubd.c | 27 +++
arch/nds32/math-emu/fsubs.c | 27 +++
24 files changed, 1073 insertions(+), 5 deletions(-)
create mode 100644 arch/nds32/include/asm/fpuemu.h
create mode 100644 arch/nds32/include/asm/nds32_fpu_inst.h
create mode 100644 arch/nds32/include/asm/sfp-machine.h
create mode 100644 arch/nds32/math-emu/Makefile
create mode 100644 arch/nds32/math-emu/faddd.c
create mode 100644 arch/nds32/math-emu/fadds.c
create mode 100644 arch/nds32/math-emu/fcmpd.c
create mode 100644 arch/nds32/math-emu/fcmps.c
create mode 100644 arch/nds32/math-emu/fd2s.c
create mode 100644 arch/nds32/math-emu/fdivd.c
create mode 100644 arch/nds32/math-emu/fdivs.c
create mode 100644 arch/nds32/math-emu/fmuld.c
create mode 100644 arch/nds32/math-emu/fmuls.c
create mode 100644 arch/nds32/math-emu/fnegd.c
create mode 100644 arch/nds32/math-emu/fnegs.c
create mode 100644 arch/nds32/math-emu/fpuemu.c
create mode 100644 arch/nds32/math-emu/fs2d.c
create mode 100644 arch/nds32/math-emu/fsqrtd.c
create mode 100644 arch/nds32/math-emu/fsqrts.c
create mode 100644 arch/nds32/math-emu/fsubd.c
create mode 100644 arch/nds32/math-emu/fsubs.c

diff --git a/arch/nds32/Makefile b/arch/nds32/Makefile
index 599ee62..e034e30 100644
--- a/arch/nds32/Makefile
+++ b/arch/nds32/Makefile
@@ -36,6 +36,7 @@ export TEXTADDR

# If we have a machine-specific directory, then include it in the build.
core-y += arch/nds32/kernel/ arch/nds32/mm/
+core-$(CONFIG_FPU) += arch/nds32/math-emu/
libs-y += arch/nds32/lib/

ifneq '$(CONFIG_NDS32_BUILTIN_DTB)' '""'
diff --git a/arch/nds32/include/asm/fpu.h b/arch/nds32/include/asm/fpu.h
index 3132400..10df5f0 100644
--- a/arch/nds32/include/asm/fpu.h
+++ b/arch/nds32/include/asm/fpu.h
@@ -13,6 +13,7 @@
extern void save_fpu(struct task_struct *__tsk);
extern void fpload(const struct fpu_struct *fpregs);
extern bool do_fpu_exception(unsigned int subtype, struct pt_regs *regs);
+extern int do_fpuemu(struct pt_regs *regs, struct fpu_struct *fpu);

#define test_tsk_fpu(regs) (regs->fucop_ctl & FUCOP_CTL_mskCP0EN)

diff --git a/arch/nds32/include/asm/fpuemu.h b/arch/nds32/include/asm/fpuemu.h
new file mode 100644
index 0000000..c4bd0c7
--- /dev/null
+++ b/arch/nds32/include/asm/fpuemu.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2005-2018 Andes Technology Corporation */
+
+#ifndef __ARCH_NDS32_FPUEMU_H
+#define __ARCH_NDS32_FPUEMU_H
+
+/*
+ * single precision
+ */
+
+void fadds(void *ft, void *fa, void *fb);
+void fsubs(void *ft, void *fa, void *fb);
+void fmuls(void *ft, void *fa, void *fb);
+void fdivs(void *ft, void *fa, void *fb);
+void fs2d(void *ft, void *fa);
+void fsqrts(void *ft, void *fa);
+void fnegs(void *ft, void *fa);
+int fcmps(void *ft, void *fa, void *fb, int cop);
+
+/*
+ * double precision
+ */
+void faddd(void *ft, void *fa, void *fb);
+void fsubd(void *ft, void *fa, void *fb);
+void fmuld(void *ft, void *fa, void *fb);
+void fdivd(void *ft, void *fa, void *fb);
+void fsqrtd(void *ft, void *fa);
+void fd2s(void *ft, void *fa);
+void fnegd(void *ft, void *fa);
+int fcmpd(void *ft, void *fa, void *fb, int cop);
+
+#endif /* __ARCH_NDS32_FPUEMU_H */
diff --git a/arch/nds32/include/asm/nds32_fpu_inst.h b/arch/nds32/include/asm/nds32_fpu_inst.h
new file mode 100644
index 0000000..1e4b86a
--- /dev/null
+++ b/arch/nds32/include/asm/nds32_fpu_inst.h
@@ -0,0 +1,109 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2005-2018 Andes Technology Corporation */
+
+#ifndef __NDS32_FPU_INST_H
+#define __NDS32_FPU_INST_H
+
+#define cop0_op 0x35
+
+/*
+ * COP0 field of opcodes.
+ */
+#define fs1_op 0x0
+#define fs2_op 0x4
+#define fd1_op 0x8
+#define fd2_op 0xc
+
+/*
+ * FS1 opcode.
+ */
+enum fs1 {
+ fadds_op, fsubs_op, fcpynss_op, fcpyss_op,
+ fmadds_op, fmsubs_op, fcmovns_op, fcmovzs_op,
+ fnmadds_op, fnmsubs_op,
+ fmuls_op = 0xc, fdivs_op,
+ fs1_f2op_op = 0xf
+};
+
+/*
+ * FS1/F2OP opcode.
+ */
+enum fs1_f2 {
+ fs2d_op, fsqrts_op,
+ fui2s_op = 0x8, fsi2s_op = 0xc,
+ fs2ui_op = 0x10, fs2ui_z_op = 0x14,
+ fs2si_op = 0x18, fs2si_z_op = 0x1c
+};
+
+/*
+ * FS2 opcode.
+ */
+enum fs2 {
+ fcmpeqs_op, fcmpeqs_e_op, fcmplts_op, fcmplts_e_op,
+ fcmples_op, fcmples_e_op, fcmpuns_op, fcmpuns_e_op
+};
+
+/*
+ * FD1 opcode.
+ */
+enum fd1 {
+ faddd_op, fsubd_op, fcpynsd_op, fcpysd_op,
+ fmaddd_op, fmsubd_op, fcmovnd_op, fcmovzd_op,
+ fnmaddd_op, fnmsubd_op,
+ fmuld_op = 0xc, fdivd_op, fd1_f2op_op = 0xf
+};
+
+/*
+ * FD1/F2OP opcode.
+ */
+enum fd1_f2 {
+ fd2s_op, fsqrtd_op,
+ fui2d_op = 0x8, fsi2d_op = 0xc,
+ fd2ui_op = 0x10, fd2ui_z_op = 0x14,
+ fd2si_op = 0x18, fd2si_z_op = 0x1c
+};
+
+/*
+ * FD2 opcode.
+ */
+enum fd2 {
+ fcmpeqd_op, fcmpeqd_e_op, fcmpltd_op, fcmpltd_e_op,
+ fcmpled_op, fcmpled_e_op, fcmpund_op, fcmpund_e_op
+};
+
+#define NDS32Insn(x) x
+
+#define I_OPCODE_off 25
+#define NDS32Insn_OPCODE(x) (NDS32Insn(x) >> I_OPCODE_off)
+
+#define I_OPCODE_offRt 20
+#define I_OPCODE_mskRt (0x1fUL << I_OPCODE_offRt)
+#define NDS32Insn_OPCODE_Rt(x) \
+ ((NDS32Insn(x) & I_OPCODE_mskRt) >> I_OPCODE_offRt)
+
+#define I_OPCODE_offRa 15
+#define I_OPCODE_mskRa (0x1fUL << I_OPCODE_offRa)
+#define NDS32Insn_OPCODE_Ra(x) \
+ ((NDS32Insn(x) & I_OPCODE_mskRa) >> I_OPCODE_offRa)
+
+#define I_OPCODE_offRb 10
+#define I_OPCODE_mskRb (0x1fUL << I_OPCODE_offRb)
+#define NDS32Insn_OPCODE_Rb(x) \
+ ((NDS32Insn(x) & I_OPCODE_mskRb) >> I_OPCODE_offRb)
+
+#define I_OPCODE_offbit1014 10
+#define I_OPCODE_mskbit1014 (0x1fUL << I_OPCODE_offbit1014)
+#define NDS32Insn_OPCODE_BIT1014(x) \
+ ((NDS32Insn(x) & I_OPCODE_mskbit1014) >> I_OPCODE_offbit1014)
+
+#define I_OPCODE_offbit69 6
+#define I_OPCODE_mskbit69 (0xfUL << I_OPCODE_offbit69)
+#define NDS32Insn_OPCODE_BIT69(x) \
+ ((NDS32Insn(x) & I_OPCODE_mskbit69) >> I_OPCODE_offbit69)
+
+#define I_OPCODE_offCOP0 0
+#define I_OPCODE_mskCOP0 (0x3fUL << I_OPCODE_offCOP0)
+#define NDS32Insn_OPCODE_COP0(x) \
+ ((NDS32Insn(x) & I_OPCODE_mskCOP0) >> I_OPCODE_offCOP0)
+
+#endif /* __NDS32_FPU_INST_H */
diff --git a/arch/nds32/include/asm/sfp-machine.h b/arch/nds32/include/asm/sfp-machine.h
new file mode 100644
index 0000000..b1a5caa
--- /dev/null
+++ b/arch/nds32/include/asm/sfp-machine.h
@@ -0,0 +1,158 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2005-2018 Andes Technology Corporation */
+
+#include <asm/bitfield.h>
+
+#define _FP_W_TYPE_SIZE 32
+#define _FP_W_TYPE unsigned long
+#define _FP_WS_TYPE signed long
+#define _FP_I_TYPE long
+
+#define __ll_B ((UWtype) 1 << (W_TYPE_SIZE / 2))
+#define __ll_lowpart(t) ((UWtype) (t) & (__ll_B - 1))
+#define __ll_highpart(t) ((UWtype) (t) >> (W_TYPE_SIZE / 2))
+
+#define _FP_MUL_MEAT_S(R, X, Y) \
+ _FP_MUL_MEAT_1_wide(_FP_WFRACBITS_S, R, X, Y, umul_ppmm)
+#define _FP_MUL_MEAT_D(R, X, Y) \
+ _FP_MUL_MEAT_2_wide(_FP_WFRACBITS_D, R, X, Y, umul_ppmm)
+#define _FP_MUL_MEAT_Q(R, X, Y) \
+ _FP_MUL_MEAT_4_wide(_FP_WFRACBITS_Q, R, X, Y, umul_ppmm)
+
+#define _FP_MUL_MEAT_DW_S(R, X, Y) \
+ _FP_MUL_MEAT_DW_1_wide(_FP_WFRACBITS_S, R, X, Y, umul_ppmm)
+#define _FP_MUL_MEAT_DW_D(R, X, Y) \
+ _FP_MUL_MEAT_DW_2_wide(_FP_WFRACBITS_D, R, X, Y, umul_ppmm)
+
+#define _FP_DIV_MEAT_S(R, X, Y) _FP_DIV_MEAT_1_udiv_norm(S, R, X, Y)
+#define _FP_DIV_MEAT_D(R, X, Y) _FP_DIV_MEAT_2_udiv(D, R, X, Y)
+
+#define _FP_NANFRAC_S ((_FP_QNANBIT_S << 1) - 1)
+#define _FP_NANFRAC_D ((_FP_QNANBIT_D << 1) - 1), -1
+#define _FP_NANFRAC_Q ((_FP_QNANBIT_Q << 1) - 1), -1, -1, -1
+#define _FP_NANSIGN_S 0
+#define _FP_NANSIGN_D 0
+#define _FP_NANSIGN_Q 0
+
+#define _FP_KEEPNANFRACP 1
+#define _FP_QNANNEGATEDP 0
+
+#define _FP_CHOOSENAN(fs, wc, R, X, Y, OP) \
+do { \
+ if ((_FP_FRAC_HIGH_RAW_##fs(X) & _FP_QNANBIT_##fs) \
+ && !(_FP_FRAC_HIGH_RAW_##fs(Y) & _FP_QNANBIT_##fs)) { \
+ R##_s = Y##_s; \
+ _FP_FRAC_COPY_##wc(R, Y); \
+ } else { \
+ R##_s = X##_s; \
+ _FP_FRAC_COPY_##wc(R, X); \
+ } \
+ R##_c = FP_CLS_NAN; \
+} while (0)
+
+#define __FPU_FPCSR (current->thread.fpu.fpcsr)
+
+/* Obtain the current rounding mode. */
+#define FP_ROUNDMODE \
+({ \
+ __FPU_FPCSR & FPCSR_mskRM; \
+})
+
+#define FP_RND_NEAREST 0
+#define FP_RND_PINF 1
+#define FP_RND_MINF 2
+#define FP_RND_ZERO 3
+
+#define FP_EX_INVALID FPCSR_mskIVO
+#define FP_EX_DIVZERO FPCSR_mskDBZ
+#define FP_EX_OVERFLOW FPCSR_mskOVF
+#define FP_EX_UNDERFLOW FPCSR_mskUDF
+#define FP_EX_INEXACT FPCSR_mskIEX
+
+#define SF_CEQ 2
+#define SF_CLT 1
+#define SF_CGT 3
+#define SF_CUN 4
+
+#include <asm/byteorder.h>
+
+#ifdef __BIG_ENDIAN__
+#define __BYTE_ORDER __BIG_ENDIAN
+#define __LITTLE_ENDIAN 0
+#else
+#define __BYTE_ORDER __LITTLE_ENDIAN
+#define __BIG_ENDIAN 0
+#endif
+
+#define abort() do { } while (0)
+#define umul_ppmm(w1, w0, u, v) \
+do { \
+ UWtype __x0, __x1, __x2, __x3; \
+ UHWtype __ul, __vl, __uh, __vh; \
+ \
+ __ul = __ll_lowpart(u); \
+ __uh = __ll_highpart(u); \
+ __vl = __ll_lowpart(v); \
+ __vh = __ll_highpart(v); \
+ \
+ __x0 = (UWtype) __ul * __vl; \
+ __x1 = (UWtype) __ul * __vh; \
+ __x2 = (UWtype) __uh * __vl; \
+ __x3 = (UWtype) __uh * __vh; \
+ \
+ __x1 += __ll_highpart(__x0); \
+ __x1 += __x2; \
+ if (__x1 < __x2) \
+ __x3 += __ll_B; \
+ \
+ (w1) = __x3 + __ll_highpart(__x1); \
+ (w0) = __ll_lowpart(__x1) * __ll_B + __ll_lowpart(__x0); \
+} while (0)
+
+#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
+do { \
+ UWtype __x; \
+ __x = (al) + (bl); \
+ (sh) = (ah) + (bh) + (__x < (al)); \
+ (sl) = __x; \
+} while (0)
+
+#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
+do { \
+ UWtype __x; \
+ __x = (al) - (bl); \
+ (sh) = (ah) - (bh) - (__x > (al)); \
+ (sl) = __x; \
+} while (0)
+
+#define udiv_qrnnd(q, r, n1, n0, d) \
+do { \
+ UWtype __d1, __d0, __q1, __q0, __r1, __r0, __m; \
+ __d1 = __ll_highpart(d); \
+ __d0 = __ll_lowpart(d); \
+ \
+ __r1 = (n1) % __d1; \
+ __q1 = (n1) / __d1; \
+ __m = (UWtype) __q1 * __d0; \
+ __r1 = __r1 * __ll_B | __ll_highpart(n0); \
+ if (__r1 < __m) { \
+ __q1--, __r1 += (d); \
+ if (__r1 >= (d)) \
+ if (__r1 < __m) \
+ __q1--, __r1 += (d); \
+ } \
+ __r1 -= __m; \
+ __r0 = __r1 % __d1; \
+ __q0 = __r1 / __d1; \
+ __m = (UWtype) __q0 * __d0; \
+ __r0 = __r0 * __ll_B | __ll_lowpart(n0); \
+ if (__r0 < __m) { \
+ __q0--, __r0 += (d); \
+ if (__r0 >= (d)) \
+ if (__r0 < __m) \
+ __q0--, __r0 += (d); \
+ } \
+ __r0 -= __m; \
+ (q) = (UWtype) __q1 * __ll_B | __q0; \
+ (r) = __r0; \
+} while (0)
diff --git a/arch/nds32/kernel/fpu.c b/arch/nds32/kernel/fpu.c
index 7353746..75f611b 100644
--- a/arch/nds32/kernel/fpu.c
+++ b/arch/nds32/kernel/fpu.c
@@ -171,10 +171,10 @@ inline void fill_sigfpe_signo(unsigned int fpcsr, int *signo)
{
if (fpcsr & FPCSR_mskOVFT)
*signo = FPE_FLTOVF;
- else if (fpcsr & FPCSR_mskUDFT)
- *signo = FPE_FLTUND;
else if (fpcsr & FPCSR_mskIVOT)
*signo = FPE_FLTINV;
+ else if (fpcsr & FPCSR_mskUDFT)
+ *signo = FPE_FLTUND;
else if (fpcsr & FPCSR_mskDBZT)
*signo = FPE_FLTDIV;
else if (fpcsr & FPCSR_mskIEXT)
@@ -189,16 +189,37 @@ inline void handle_fpu_exception(struct pt_regs *regs)
lose_fpu();
fpcsr = current->thread.fpu.fpcsr;

- if (fpcsr & FPCSR_mskRIT) {
+ if (fpcsr & FPCSR_mskDNIT) {
+ si_signo = do_fpuemu(regs, &current->thread.fpu);
+ fpcsr = current->thread.fpu.fpcsr;
+ if (!si_signo)
+ goto done;
+ } else if (fpcsr & FPCSR_mskRIT) {
if (!user_mode(regs))
do_exit(SIGILL);
si_signo = SIGILL;
+ }
+
+
+ switch (si_signo) {
+ case SIGFPE:
+ fill_sigfpe_signo(fpcsr, &si_code);
+ break;
+ case SIGILL:
show_regs(regs);
si_code = ILL_COPROC;
- } else
- fill_sigfpe_signo(fpcsr, &si_code);
+ break;
+ case SIGBUS:
+ si_code = BUS_ADRERR;
+ break;
+ default:
+ break;
+ }
+
force_sig_fault(si_signo, si_code,
(void __user *)instruction_pointer(regs), current);
+done:
+ own_fpu();
}

bool do_fpu_exception(unsigned int subtype, struct pt_regs *regs)
diff --git a/arch/nds32/math-emu/Makefile b/arch/nds32/math-emu/Makefile
new file mode 100644
index 0000000..947fe0c
--- /dev/null
+++ b/arch/nds32/math-emu/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for the Linux/nds32 kernel FPU emulation.
+#
+
+obj-y := fpuemu.o \
+ fdivd.o fmuld.o fsubd.o faddd.o fs2d.o fsqrtd.o fcmpd.o fnegs.o \
+ fdivs.o fmuls.o fsubs.o fadds.o fd2s.o fsqrts.o fcmps.o fnegd.o
diff --git a/arch/nds32/math-emu/faddd.c b/arch/nds32/math-emu/faddd.c
new file mode 100644
index 0000000..f7fd4e3
--- /dev/null
+++ b/arch/nds32/math-emu/faddd.c
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+#include <linux/uaccess.h>
+
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/double.h>
+void faddd(void *ft, void *fa, void *fb)
+{
+ FP_DECL_D(A);
+ FP_DECL_D(B);
+ FP_DECL_D(R);
+ FP_DECL_EX;
+
+ FP_UNPACK_DP(A, fa);
+ FP_UNPACK_DP(B, fb);
+
+ FP_ADD_D(R, A, B);
+
+ FP_PACK_DP(ft, R);
+
+ __FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+
+}
diff --git a/arch/nds32/math-emu/fadds.c b/arch/nds32/math-emu/fadds.c
new file mode 100644
index 0000000..f5af6ca
--- /dev/null
+++ b/arch/nds32/math-emu/fadds.c
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+#include <linux/uaccess.h>
+
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/single.h>
+void fadds(void *ft, void *fa, void *fb)
+{
+ FP_DECL_S(A);
+ FP_DECL_S(B);
+ FP_DECL_S(R);
+ FP_DECL_EX;
+
+ FP_UNPACK_SP(A, fa);
+ FP_UNPACK_SP(B, fb);
+
+ FP_ADD_S(R, A, B);
+
+ FP_PACK_SP(ft, R);
+
+ __FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+
+}
diff --git a/arch/nds32/math-emu/fcmpd.c b/arch/nds32/math-emu/fcmpd.c
new file mode 100644
index 0000000..0ea225a
--- /dev/null
+++ b/arch/nds32/math-emu/fcmpd.c
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/double.h>
+int fcmpd(void *ft, void *fa, void *fb, int cmpop)
+{
+ FP_DECL_D(A);
+ FP_DECL_D(B);
+ FP_DECL_EX;
+ long cmp;
+
+ FP_UNPACK_DP(A, fa);
+ FP_UNPACK_DP(B, fb);
+
+ FP_CMP_D(cmp, A, B, SF_CUN);
+ cmp += 2;
+ if (cmp == SF_CGT)
+ *(long *)ft = 0;
+ else
+ *(long *)ft = (cmp & cmpop) ? 1 : 0;
+
+ return 0;
+}
diff --git a/arch/nds32/math-emu/fcmps.c b/arch/nds32/math-emu/fcmps.c
new file mode 100644
index 0000000..6814807
--- /dev/null
+++ b/arch/nds32/math-emu/fcmps.c
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/single.h>
+int fcmps(void *ft, void *fa, void *fb, int cmpop)
+{
+ FP_DECL_S(A);
+ FP_DECL_S(B);
+ FP_DECL_EX;
+ long cmp;
+
+ FP_UNPACK_SP(A, fa);
+ FP_UNPACK_SP(B, fb);
+
+ FP_CMP_S(cmp, A, B, SF_CUN);
+ cmp += 2;
+ if (cmp == SF_CGT)
+ *(int *)ft = 0x0;
+ else
+ *(int *)ft = (cmp & cmpop) ? 0x1 : 0x0;
+
+ return 0;
+}
diff --git a/arch/nds32/math-emu/fd2s.c b/arch/nds32/math-emu/fd2s.c
new file mode 100644
index 0000000..1328371
--- /dev/null
+++ b/arch/nds32/math-emu/fd2s.c
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+#include <linux/uaccess.h>
+
+#include <asm/sfp-machine.h>
+#include <math-emu/double.h>
+#include <math-emu/single.h>
+#include <math-emu/soft-fp.h>
+void fd2s(void *ft, void *fa)
+{
+ FP_DECL_D(A);
+ FP_DECL_S(R);
+ FP_DECL_EX;
+
+ FP_UNPACK_DP(A, fa);
+
+ FP_CONV(S, D, 1, 2, R, A);
+
+ FP_PACK_SP(ft, R);
+
+ __FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+}
diff --git a/arch/nds32/math-emu/fdivd.c b/arch/nds32/math-emu/fdivd.c
new file mode 100644
index 0000000..458e7e9
--- /dev/null
+++ b/arch/nds32/math-emu/fdivd.c
@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+
+#include <linux/uaccess.h>
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/double.h>
+
+void fdivd(void *ft, void *fa, void *fb)
+{
+ FP_DECL_D(A);
+ FP_DECL_D(B);
+ FP_DECL_D(R);
+ FP_DECL_EX;
+
+ FP_UNPACK_DP(A, fa);
+ FP_UNPACK_DP(B, fb);
+
+ if (B_c == FP_CLS_ZERO && A_c != FP_CLS_ZERO)
+ FP_SET_EXCEPTION(FP_EX_DIVZERO);
+
+ FP_DIV_D(R, A, B);
+
+ FP_PACK_DP(ft, R);
+
+ __FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+}
diff --git a/arch/nds32/math-emu/fdivs.c b/arch/nds32/math-emu/fdivs.c
new file mode 100644
index 0000000..c7d2021
--- /dev/null
+++ b/arch/nds32/math-emu/fdivs.c
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+#include <linux/uaccess.h>
+
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/single.h>
+void fdivs(void *ft, void *fa, void *fb)
+{
+ FP_DECL_S(A);
+ FP_DECL_S(B);
+ FP_DECL_S(R);
+ FP_DECL_EX;
+
+ FP_UNPACK_SP(A, fa);
+ FP_UNPACK_SP(B, fb);
+
+ if (B_c == FP_CLS_ZERO && A_c != FP_CLS_ZERO)
+ FP_SET_EXCEPTION(FP_EX_DIVZERO);
+
+ FP_DIV_S(R, A, B);
+
+ FP_PACK_SP(ft, R);
+
+ __FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+}
diff --git a/arch/nds32/math-emu/fmuld.c b/arch/nds32/math-emu/fmuld.c
new file mode 100644
index 0000000..f3c77a4
--- /dev/null
+++ b/arch/nds32/math-emu/fmuld.c
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+#include <linux/uaccess.h>
+
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/double.h>
+void fmuld(void *ft, void *fa, void *fb)
+{
+ FP_DECL_D(A);
+ FP_DECL_D(B);
+ FP_DECL_D(R);
+ FP_DECL_EX;
+
+ FP_UNPACK_DP(A, fa);
+ FP_UNPACK_DP(B, fb);
+
+ FP_MUL_D(R, A, B);
+
+ FP_PACK_DP(ft, R);
+
+ __FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+}
diff --git a/arch/nds32/math-emu/fmuls.c b/arch/nds32/math-emu/fmuls.c
new file mode 100644
index 0000000..cf150df
--- /dev/null
+++ b/arch/nds32/math-emu/fmuls.c
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+#include <linux/uaccess.h>
+
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/single.h>
+void fmuls(void *ft, void *fa, void *fb)
+{
+ FP_DECL_S(A);
+ FP_DECL_S(B);
+ FP_DECL_S(R);
+ FP_DECL_EX;
+
+ FP_UNPACK_SP(A, fa);
+ FP_UNPACK_SP(B, fb);
+
+ FP_MUL_S(R, A, B);
+
+ FP_PACK_SP(ft, R);
+
+ __FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+}
diff --git a/arch/nds32/math-emu/fnegd.c b/arch/nds32/math-emu/fnegd.c
new file mode 100644
index 0000000..de7ea6a
--- /dev/null
+++ b/arch/nds32/math-emu/fnegd.c
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+#include <linux/uaccess.h>
+
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/double.h>
+void fnegd(void *ft, void *fa)
+{
+ FP_DECL_D(A);
+ FP_DECL_D(R);
+ FP_DECL_EX;
+
+ FP_UNPACK_DP(A, fa);
+
+ FP_NEG_D(R, A);
+
+ FP_PACK_DP(ft, R);
+
+ __FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+}
diff --git a/arch/nds32/math-emu/fnegs.c b/arch/nds32/math-emu/fnegs.c
new file mode 100644
index 0000000..07270b3
--- /dev/null
+++ b/arch/nds32/math-emu/fnegs.c
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+#include <linux/uaccess.h>
+
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/single.h>
+void fnegs(void *ft, void *fa)
+{
+ FP_DECL_S(A);
+ FP_DECL_S(R);
+ FP_DECL_EX;
+
+ FP_UNPACK_SP(A, fa);
+
+ FP_NEG_S(R, A);
+
+ FP_PACK_SP(ft, R);
+
+ __FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+}
diff --git a/arch/nds32/math-emu/fpuemu.c b/arch/nds32/math-emu/fpuemu.c
new file mode 100644
index 0000000..4d88135
--- /dev/null
+++ b/arch/nds32/math-emu/fpuemu.c
@@ -0,0 +1,361 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+
+#include <asm/bitfield.h>
+#include <asm/uaccess.h>
+#include <asm/sfp-machine.h>
+#include <asm/fpuemu.h>
+#include <asm/nds32_fpu_inst.h>
+
+#define DPFROMREG(dp, x) (dp = (void *)((unsigned long *)fpu_reg + 2*x))
+#ifdef __NDS32_EL__
+#define SPFROMREG(sp, x)\
+ ((sp) = (void *)((unsigned long *)fpu_reg + (x^1)))
+#else
+#define SPFROMREG(sp, x) ((sp) = (void *)((unsigned long *)fpu_reg + x))
+#endif
+
+#define DEF3OP(name, p, f1, f2) \
+void fpemu_##name##p(void *ft, void *fa, void *fb) \
+{ \
+ f1(fa, fa, fb); \
+ f2(ft, ft, fa); \
+}
+
+#define DEF3OPNEG(name, p, f1, f2, f3) \
+void fpemu_##name##p(void *ft, void *fa, void *fb) \
+{ \
+ f1(fa, fa, fb); \
+ f2(ft, ft, fa); \
+ f3(ft, ft); \
+}
+DEF3OP(fmadd, s, fmuls, fadds);
+DEF3OP(fmsub, s, fmuls, fsubs);
+DEF3OP(fmadd, d, fmuld, faddd);
+DEF3OP(fmsub, d, fmuld, fsubd);
+DEF3OPNEG(fnmadd, s, fmuls, fadds, fnegs);
+DEF3OPNEG(fnmsub, s, fmuls, fsubs, fnegs);
+DEF3OPNEG(fnmadd, d, fmuld, faddd, fnegd);
+DEF3OPNEG(fnmsub, d, fmuld, fsubd, fnegd);
+
+static const unsigned char cmptab[8] = {
+ SF_CEQ,
+ SF_CEQ,
+ SF_CLT,
+ SF_CLT,
+ SF_CLT | SF_CEQ,
+ SF_CLT | SF_CEQ,
+ SF_CUN,
+ SF_CUN
+};
+
+enum ARGTYPE {
+ S1S = 1,
+ S2S,
+ S1D,
+ CS,
+ D1D,
+ D2D,
+ D1S,
+ CD
+};
+union func_t {
+ void (*t)(void *ft, void *fa, void *fb);
+ void (*b)(void *ft, void *fa);
+};
+/*
+ * Emulate a single FPU arithmetic instruction.
+ */
+static int fpu_emu(struct fpu_struct *fpu_reg, unsigned long insn)
+{
+ int rfmt; /* resulting format */
+ union func_t func;
+ int ftype = 0;
+
+ switch (rfmt = NDS32Insn_OPCODE_COP0(insn)) {
+ case fs1_op:{
+ switch (NDS32Insn_OPCODE_BIT69(insn)) {
+ case fadds_op:
+ func.t = fadds;
+ ftype = S2S;
+ break;
+ case fsubs_op:
+ func.t = fsubs;
+ ftype = S2S;
+ break;
+ case fmadds_op:
+ func.t = fpemu_fmadds;
+ ftype = S2S;
+ break;
+ case fmsubs_op:
+ func.t = fpemu_fmsubs;
+ ftype = S2S;
+ break;
+ case fnmadds_op:
+ func.t = fpemu_fnmadds;
+ ftype = S2S;
+ break;
+ case fnmsubs_op:
+ func.t = fpemu_fnmsubs;
+ ftype = S2S;
+ break;
+ case fmuls_op:
+ func.t = fmuls;
+ ftype = S2S;
+ break;
+ case fdivs_op:
+ func.t = fdivs;
+ ftype = S2S;
+ break;
+ case fs1_f2op_op:
+ switch (NDS32Insn_OPCODE_BIT1014(insn)) {
+ case fs2d_op:
+ func.b = fs2d;
+ ftype = S1D;
+ break;
+ case fsqrts_op:
+ func.b = fsqrts;
+ ftype = S1S;
+ break;
+ default:
+ return SIGILL;
+ }
+ break;
+ default:
+ return SIGILL;
+ }
+ break;
+ }
+ case fs2_op:
+ switch (NDS32Insn_OPCODE_BIT69(insn)) {
+ case fcmpeqs_op:
+ case fcmpeqs_e_op:
+ case fcmplts_op:
+ case fcmplts_e_op:
+ case fcmples_op:
+ case fcmples_e_op:
+ case fcmpuns_op:
+ case fcmpuns_e_op:
+ ftype = CS;
+ break;
+ default:
+ return SIGILL;
+ }
+ break;
+ case fd1_op:{
+ switch (NDS32Insn_OPCODE_BIT69(insn)) {
+ case faddd_op:
+ func.t = faddd;
+ ftype = D2D;
+ break;
+ case fsubd_op:
+ func.t = fsubd;
+ ftype = D2D;
+ break;
+ case fmaddd_op:
+ func.t = fpemu_fmaddd;
+ ftype = D2D;
+ break;
+ case fmsubd_op:
+ func.t = fpemu_fmsubd;
+ ftype = D2D;
+ break;
+ case fnmaddd_op:
+ func.t = fpemu_fnmaddd;
+ ftype = D2D;
+ break;
+ case fnmsubd_op:
+ func.t = fpemu_fnmsubd;
+ ftype = D2D;
+ break;
+ case fmuld_op:
+ func.t = fmuld;
+ ftype = D2D;
+ break;
+ case fdivd_op:
+ func.t = fdivd;
+ ftype = D2D;
+ break;
+ case fd1_f2op_op:
+ switch (NDS32Insn_OPCODE_BIT1014(insn)) {
+ case fd2s_op:
+ func.b = fd2s;
+ ftype = D1S;
+ break;
+ case fsqrtd_op:
+ func.b = fsqrtd;
+ ftype = D1D;
+ break;
+ default:
+ return SIGILL;
+ }
+ break;
+ default:
+ return SIGILL;
+
+ }
+ break;
+ }
+
+ case fd2_op:
+ switch (NDS32Insn_OPCODE_BIT69(insn)) {
+ case fcmpeqd_op:
+ case fcmpeqd_e_op:
+ case fcmpltd_op:
+ case fcmpltd_e_op:
+ case fcmpled_op:
+ case fcmpled_e_op:
+ case fcmpund_op:
+ case fcmpund_e_op:
+ ftype = CD;
+ break;
+ default:
+ return SIGILL;
+ }
+ break;
+
+ default:
+ return SIGILL;
+ }
+
+ switch (ftype) {
+ case S1S:{
+ void *ft, *fa;
+
+ SPFROMREG(ft, NDS32Insn_OPCODE_Rt(insn));
+ SPFROMREG(fa, NDS32Insn_OPCODE_Ra(insn));
+ func.b(ft, fa);
+ break;
+ }
+ case S2S:{
+ void *ft, *fa, *fb;
+
+ SPFROMREG(ft, NDS32Insn_OPCODE_Rt(insn));
+ SPFROMREG(fa, NDS32Insn_OPCODE_Ra(insn));
+ SPFROMREG(fb, NDS32Insn_OPCODE_Rb(insn));
+ func.t(ft, fa, fb);
+ break;
+ }
+ case S1D:{
+ void *ft, *fa;
+
+ DPFROMREG(ft, NDS32Insn_OPCODE_Rt(insn));
+ SPFROMREG(fa, NDS32Insn_OPCODE_Ra(insn));
+ func.b(ft, fa);
+ break;
+ }
+ case CS:{
+ unsigned int cmpop = NDS32Insn_OPCODE_BIT69(insn);
+ void *ft, *fa, *fb;
+
+ SPFROMREG(ft, NDS32Insn_OPCODE_Rt(insn));
+ SPFROMREG(fa, NDS32Insn_OPCODE_Ra(insn));
+ SPFROMREG(fb, NDS32Insn_OPCODE_Rb(insn));
+ if (cmpop < 0x8) {
+ cmpop = cmptab[cmpop];
+ fcmps(ft, fa, fb, cmpop);
+ } else
+ return SIGILL;
+ break;
+ }
+ case D1D:{
+ void *ft, *fa;
+
+ DPFROMREG(ft, NDS32Insn_OPCODE_Rt(insn));
+ DPFROMREG(fa, NDS32Insn_OPCODE_Ra(insn));
+ func.b(ft, fa);
+ break;
+ }
+ case D2D:{
+ void *ft, *fa, *fb;
+
+ DPFROMREG(ft, NDS32Insn_OPCODE_Rt(insn));
+ DPFROMREG(fa, NDS32Insn_OPCODE_Ra(insn));
+ DPFROMREG(fb, NDS32Insn_OPCODE_Rb(insn));
+ func.t(ft, fa, fb);
+ break;
+ }
+ case D1S:{
+ void *ft, *fa;
+
+ SPFROMREG(ft, NDS32Insn_OPCODE_Rt(insn));
+ DPFROMREG(fa, NDS32Insn_OPCODE_Ra(insn));
+ func.b(ft, fa);
+ break;
+ }
+ case CD:{
+ unsigned int cmpop = NDS32Insn_OPCODE_BIT69(insn);
+ void *ft, *fa, *fb;
+
+ SPFROMREG(ft, NDS32Insn_OPCODE_Rt(insn));
+ DPFROMREG(fa, NDS32Insn_OPCODE_Ra(insn));
+ DPFROMREG(fb, NDS32Insn_OPCODE_Rb(insn));
+ if (cmpop < 0x8) {
+ cmpop = cmptab[cmpop];
+ fcmpd(ft, fa, fb, cmpop);
+ } else
+ return SIGILL;
+ break;
+ }
+ default:
+ return SIGILL;
+ }
+
+ /*
+ * If an exception is required, generate a tidy SIGFPE exception.
+ */
+ if ((fpu_reg->fpcsr << 5) & fpu_reg->fpcsr & FPCSR_mskALLE)
+ return SIGFPE;
+ return 0;
+}
+
+
+int do_fpuemu(struct pt_regs *regs, struct fpu_struct *fpu)
+{
+ unsigned long insn = 0, addr = regs->ipc;
+ unsigned long emulpc, contpc;
+ unsigned char *pc = (void *)&insn;
+ char c;
+ int i = 0;
+
+ for (i = 0; i < 4; i++) {
+ if (__get_user(c, (unsigned char *)addr++))
+ return SIGBUS;
+ *pc++ = c;
+ }
+
+ insn = be32_to_cpu(insn);
+
+ emulpc = regs->ipc;
+ contpc = regs->ipc + 4;
+
+ switch (NDS32Insn_OPCODE(insn)) {
+ case cop0_op:
+ switch (NDS32Insn_OPCODE_COP0(insn)) {
+
+ case fs1_op:
+ case fs2_op:
+ case fd1_op:
+ case fd2_op:
+ {
+ /* Do fpu emulation */
+ int sig = fpu_emu(fpu, insn);
+
+ if (sig)
+ return sig;
+ }
+ break;
+
+ default:
+ return SIGILL;
+ }
+ break;
+ default:
+ return SIGILL;
+ }
+
+ /* we did it !! */
+ regs->ipc = contpc;
+
+ return 0;
+}
diff --git a/arch/nds32/math-emu/fs2d.c b/arch/nds32/math-emu/fs2d.c
new file mode 100644
index 0000000..0e8db90
--- /dev/null
+++ b/arch/nds32/math-emu/fs2d.c
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+
+#include <linux/uaccess.h>
+#include <asm/sfp-machine.h>
+#include <math-emu/double.h>
+#include <math-emu/single.h>
+#include <math-emu/soft-fp.h>
+
+void fs2d(void *ft, void *fa)
+{
+ FP_DECL_S(A);
+ FP_DECL_D(R);
+ FP_DECL_EX;
+
+ FP_UNPACK_SP(A, fa);
+
+ FP_CONV(D, S, 2, 1, R, A);
+
+ FP_PACK_DP(ft, R);
+
+ __FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+}
diff --git a/arch/nds32/math-emu/fsqrtd.c b/arch/nds32/math-emu/fsqrtd.c
new file mode 100644
index 0000000..c3a8dbd
--- /dev/null
+++ b/arch/nds32/math-emu/fsqrtd.c
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+
+#include <linux/uaccess.h>
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/double.h>
+void fsqrtd(void *ft, void *fa)
+{
+ FP_DECL_D(A);
+ FP_DECL_D(R);
+ FP_DECL_EX;
+
+ FP_UNPACK_DP(A, fa);
+
+ FP_SQRT_D(R, A);
+
+ FP_PACK_DP(ft, R);
+
+ __FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+}
diff --git a/arch/nds32/math-emu/fsqrts.c b/arch/nds32/math-emu/fsqrts.c
new file mode 100644
index 0000000..4c6f94b
--- /dev/null
+++ b/arch/nds32/math-emu/fsqrts.c
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+
+#include <linux/uaccess.h>
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/single.h>
+void fsqrts(void *ft, void *fa)
+{
+ FP_DECL_S(A);
+ FP_DECL_S(R);
+ FP_DECL_EX;
+
+ FP_UNPACK_SP(A, fa);
+
+ FP_SQRT_S(R, A);
+
+ FP_PACK_SP(ft, R);
+
+ __FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+}
diff --git a/arch/nds32/math-emu/fsubd.c b/arch/nds32/math-emu/fsubd.c
new file mode 100644
index 0000000..81b6a0d
--- /dev/null
+++ b/arch/nds32/math-emu/fsubd.c
@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+#include <linux/uaccess.h>
+
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/double.h>
+void fsubd(void *ft, void *fa, void *fb)
+{
+
+ FP_DECL_D(A);
+ FP_DECL_D(B);
+ FP_DECL_D(R);
+ FP_DECL_EX;
+
+ FP_UNPACK_DP(A, fa);
+ FP_UNPACK_DP(B, fb);
+
+ if (B_c != FP_CLS_NAN)
+ B_s ^= 1;
+
+ FP_ADD_D(R, A, B);
+
+ FP_PACK_DP(ft, R);
+
+ __FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+}
diff --git a/arch/nds32/math-emu/fsubs.c b/arch/nds32/math-emu/fsubs.c
new file mode 100644
index 0000000..61ddd97
--- /dev/null
+++ b/arch/nds32/math-emu/fsubs.c
@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+#include <linux/uaccess.h>
+
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/single.h>
+void fsubs(void *ft, void *fa, void *fb)
+{
+
+ FP_DECL_S(A);
+ FP_DECL_S(B);
+ FP_DECL_S(R);
+ FP_DECL_EX;
+
+ FP_UNPACK_SP(A, fa);
+ FP_UNPACK_SP(B, fb);
+
+ if (B_c != FP_CLS_NAN)
+ B_s ^= 1;
+
+ FP_ADD_S(R, A, B);
+
+ FP_PACK_SP(ft, R);
+
+ __FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+}
--
1.7.1
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