arch/csky/abiv2/inc/abi/fpu.h

/* SPDX-License-Identifier: GPL-2.0 */
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.

#ifndef __ASM_CSKY_FPU_H
#define __ASM_CSKY_FPU_H

#include <asm/sigcontext.h>
#include <asm/ptrace.h>

int fpu_libc_helper(struct pt_regs *regs);
void fpu_fpe(struct pt_regs *regs);

static inline void init_fpu(void) { mtcr("cr<1, 2>", 0); }

void save_to_user_fp(struct user_fp *user_fp);
void restore_from_user_fp(struct user_fp *user_fp);

/*
 * Define the fesr bit for fpe handle.
 */
#define  FPE_ILLE  (1 << 16)    /* Illegal instruction  */
#define  FPE_FEC   (1 << 7)     /* Input float-point arithmetic exception */
#define  FPE_IDC   (1 << 5)     /* Input denormalized exception */
#define  FPE_IXC   (1 << 4)     /* Inexact exception */
#define  FPE_UFC   (1 << 3)     /* Underflow exception */
#define  FPE_OFC   (1 << 2)     /* Overflow exception */
#define  FPE_DZC   (1 << 1)     /* Divide by zero exception */
#define  FPE_IOC   (1 << 0)     /* Invalid operation exception */
#define  FPE_REGULAR_EXCEPTION (FPE_IXC | FPE_UFC | FPE_OFC | FPE_DZC | FPE_IOC)

#ifdef CONFIG_OPEN_FPU_IDE
#define IDE_STAT   (1 << 5)
#else
#define IDE_STAT   0
#endif

#ifdef CONFIG_OPEN_FPU_IXE
#define IXE_STAT   (1 << 4)
#else
#define IXE_STAT   0
#endif

#ifdef CONFIG_OPEN_FPU_UFE
#define UFE_STAT   (1 << 3)
#else
#define UFE_STAT   0
#endif

#ifdef CONFIG_OPEN_FPU_OFE
#define OFE_STAT   (1 << 2)
#else
#define OFE_STAT   0
#endif

#ifdef CONFIG_OPEN_FPU_DZE
#define DZE_STAT   (1 << 1)
#else
#define DZE_STAT   0
#endif

#ifdef CONFIG_OPEN_FPU_IOE
#define IOE_STAT   (1 << 0)
#else
#define IOE_STAT   0
#endif

#endif /* __ASM_CSKY_FPU_H */