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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/arch/nds32/include/uapi/asm/sigcontext.h
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@@ -1,4 +1,4 @@
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-// SPDX-License-Identifier: GPL-2.0
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+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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 // Copyright (C) 2005-2017 Andes Technology Corporation
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 #ifndef _ASMNDS32_SIGCONTEXT_H
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  * before the signal handler was invoked.  Note: only add new entries
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  * to the end of the structure.
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  */
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+struct fpu_struct {
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+	unsigned long long fd_regs[32];
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+	unsigned long fpcsr;
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+	/*
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+	 * When CONFIG_SUPPORT_DENORMAL_ARITHMETIC is defined, kernel prevents
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+	 * hardware from treating the denormalized output as an underflow case
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+	 * and rounding it to a normal number. Hence kernel enables the UDF and
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+	 * IEX trap in the fpcsr register to step in the calculation.
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+	 * However, the UDF and IEX trap enable bit in $fpcsr also lose
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+	 * their use.
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+	 *
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+	 * UDF_IEX_trap replaces the feature of UDF and IEX trap enable bit in
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+	 * $fpcsr to control the trap of underflow and inexact. The bit filed
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+	 * of UDF_IEX_trap is the same as $fpcsr, 10th bit is used to enable UDF
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+	 * exception trapping and 11th bit is used to enable IEX exception
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+	 * trapping.
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+	 *
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+	 * UDF_IEX_trap is only modified through fp_udfiex_crtl syscall.
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+	 * Therefore, UDF_IEX_trap needn't be saved and restored in each
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+	 * context switch.
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+	 */
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+	unsigned long UDF_IEX_trap;
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+};
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 struct zol_struct {
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 	unsigned long nds32_lc;	/* $LC */
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 	unsigned long fault_address;
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 	unsigned long used_math_flag;
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 	/* FPU Registers */
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+	struct fpu_struct fpu;
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 	struct zol_struct zol;
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 };
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