From 1543e317f1da31b75942316931e8f491a8920811 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Thu, 04 Jan 2024 10:08:02 +0000
Subject: [PATCH] disable FB
---
kernel/arch/nds32/include/uapi/asm/sigcontext.h | 26 +++++++++++++++++++++++++-
1 files changed, 25 insertions(+), 1 deletions(-)
diff --git a/kernel/arch/nds32/include/uapi/asm/sigcontext.h b/kernel/arch/nds32/include/uapi/asm/sigcontext.h
index 00567b2..6c1e664 100644
--- a/kernel/arch/nds32/include/uapi/asm/sigcontext.h
+++ b/kernel/arch/nds32/include/uapi/asm/sigcontext.h
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
// Copyright (C) 2005-2017 Andes Technology Corporation
#ifndef _ASMNDS32_SIGCONTEXT_H
@@ -9,6 +9,29 @@
* before the signal handler was invoked. Note: only add new entries
* to the end of the structure.
*/
+struct fpu_struct {
+ unsigned long long fd_regs[32];
+ unsigned long fpcsr;
+ /*
+ * When CONFIG_SUPPORT_DENORMAL_ARITHMETIC is defined, kernel prevents
+ * hardware from treating the denormalized output as an underflow case
+ * and rounding it to a normal number. Hence kernel enables the UDF and
+ * IEX trap in the fpcsr register to step in the calculation.
+ * However, the UDF and IEX trap enable bit in $fpcsr also lose
+ * their use.
+ *
+ * UDF_IEX_trap replaces the feature of UDF and IEX trap enable bit in
+ * $fpcsr to control the trap of underflow and inexact. The bit filed
+ * of UDF_IEX_trap is the same as $fpcsr, 10th bit is used to enable UDF
+ * exception trapping and 11th bit is used to enable IEX exception
+ * trapping.
+ *
+ * UDF_IEX_trap is only modified through fp_udfiex_crtl syscall.
+ * Therefore, UDF_IEX_trap needn't be saved and restored in each
+ * context switch.
+ */
+ unsigned long UDF_IEX_trap;
+};
struct zol_struct {
unsigned long nds32_lc; /* $LC */
@@ -54,6 +77,7 @@
unsigned long fault_address;
unsigned long used_math_flag;
/* FPU Registers */
+ struct fpu_struct fpu;
struct zol_struct zol;
};
--
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