change system file

hc

2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771

 kernel/arch/nds32/kernel/sys_nds32.c
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@@ -6,6 +6,8 @@
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 #include <asm/cachectl.h>
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 #include <asm/proc-fns.h>
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+#include <asm/fpu.h>
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+#include <asm/fp_udfiex_crtl.h>
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 SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
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 	       unsigned long, prot, unsigned long, flags,
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@@ -48,3 +50,35 @@
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 	return 0;
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 }
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+
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+SYSCALL_DEFINE2(fp_udfiex_crtl, unsigned int, cmd, unsigned int, act)
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+{
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+#if IS_ENABLED(CONFIG_SUPPORT_DENORMAL_ARITHMETIC)
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+	int old_udf_iex;
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+
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+	if (!used_math()) {
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+		load_fpu(&init_fpuregs);
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+		current->thread.fpu.UDF_IEX_trap = init_fpuregs.UDF_IEX_trap;
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+		set_used_math();
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+	}
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+
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+	old_udf_iex = current->thread.fpu.UDF_IEX_trap;
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+	act &= (FPCSR_mskUDFE | FPCSR_mskIEXE);
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+
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+	switch (cmd) {
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+	case DISABLE_UDF_IEX_TRAP:
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+		current->thread.fpu.UDF_IEX_trap &= ~act;
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+		break;
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+	case ENABLE_UDF_IEX_TRAP:
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+		current->thread.fpu.UDF_IEX_trap |= act;
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+		break;
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+	case GET_UDF_IEX_TRAP:
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+		break;
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+	default:
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+		return -EINVAL;
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+	}
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+	return old_udf_iex;
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+#else
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+	return -ENOTSUPP;
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+#endif
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+}