/*      $NetBSD: frame.h,v 1.35 2024/01/13 17:07:26 thorpej Exp $       */

/*
* Copyright (c) 1988 University of Utah.
* Copyright (c) 1982, 1990, 1993
*      The Regents of the University of California.  All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: Utah $Hdr: frame.h 1.8 92/12/20$
*
*      @(#)frame.h     8.1 (Berkeley) 6/10/93
*/

#ifndef _M68K_FRAME_H_
#define _M68K_FRAME_H_

#include <m68k/cpuframe.h>

/* common frame size */
#define CFSIZE          (sizeof(struct frame) - sizeof(union F_u))
#define NFMTSIZE        9

#define FMT0            0x0
#define FMT1            0x1
#define FMT2            0x2
#define FMT3            0x3
#define FMT4            0x4
#define FMT7            0x7
#define FMT8            0x8
#define FMT9            0x9
#define FMTA            0xA
#define FMTB            0xB

/* frame specific info sizes */
#define FMT0SIZE        0
#define FMT1SIZE        0
#define FMT2SIZE        sizeof(struct fmt2)
#define FMT3SIZE        sizeof(struct fmt3)
#define FMT4SIZE        sizeof(struct fmt4)
#define FMT7SIZE        sizeof(struct fmt7)
#define FMT8SIZE        sizeof(struct fmt8)
#define FMT9SIZE        sizeof(struct fmt9)
#define FMTASIZE        sizeof(struct fmtA)
#define FMTBSIZE        sizeof(struct fmtB)

/* 68010 SSW bits */
#define SSW1_RR         0x8000
#define SSW1_IF         0x2000
#define SSW1_DF         0x1000
#define SSW1_RM         0x0800
#define SSW1_HI         0x0400
#define SSW1_BX         0x0200
#define SSW1_RW         0x0100
#define SSW1_FCMASK     0x000F

/* 68020/68030 SSW bits */
#define SSW_RC          0x2000
#define SSW_RB          0x1000
#define SSW_DF          0x0100
#define SSW_RM          0x0080
#define SSW_RW          0x0040
#define SSW_FCMASK      0x0007

/* 68040 SSW bits */
#define SSW4_CP         0x8000
#define SSW4_CU         0x4000
#define SSW4_CT         0x2000
#define SSW4_CM         0x1000
#define SSW4_MA         0x0800
#define SSW4_ATC        0x0400
#define SSW4_LK         0x0200
#define SSW4_RW         0x0100
#define SSW4_WBSV       0x0080  /* really in WB status, not SSW */
#define SSW4_SZMASK     0x0060
#define SSW4_SZLW       0x0000
#define SSW4_SZB        0x0020
#define SSW4_SZW        0x0040
#define SSW4_SZLN       0x0060
#define SSW4_TTMASK     0x0018
#define SSW4_TTNOR      0x0000
#define SSW4_TTM16      0x0008
#define SSW4_TMMASK     0x0007
#define SSW4_TMDCP      0x0000
#define SSW4_TMUD       0x0001
#define SSW4_TMUC       0x0002
#define SSW4_TMKD       0x0005
#define SSW4_TMKC       0x0006

/* 060 Fault Status Long Word (FPSP) */

#define FSLW_MA         0x08000000
#define FSLW_LK         0x02000000
#define FSLW_RW         0x01800000

#define FSLW_RW_R       0x01000000
#define FSLW_RW_W       0x00800000

#define FSLW_SIZE       0x00600000
/*
* We better define the FSLW_SIZE values here, as the table given in the
* MC68060UM/AD rev. 0/1 p. 8-23 is wrong, and was corrected in the errata
* document.
*/
#define FSLW_SIZE_LONG  0x00000000
#define FSLW_SIZE_BYTE  0x00200000
#define FSLW_SIZE_WORD  0x00400000
#define FSLW_SIZE_MV16  0x00600000

#define FLSW_TT         0x00180000
#define FSLW_TM         0x00070000
#define FSLW_TM_SV      0x00040000



#define FSLW_IO         0x00008000
#define FSLW_PBE        0x00004000
#define FSLW_SBE        0x00002000
#define FSLW_PTA        0x00001000
#define FSLW_PTB        0x00000800
#define FSLW_IL         0x00000400
#define FSLW_PF         0x00000200
#define FSLW_SP         0x00000100
#define FSLW_WP         0x00000080
#define FSLW_TWE        0x00000040
#define FSLW_RE         0x00000020
#define FSLW_WE         0x00000010
#define FSLW_TTR        0x00000008
#define FSLW_BPE        0x00000004
#define FSLW_SEE        0x00000001

/* struct fpframe060 */
#define FPF6_FMT_NULL   0x00
#define FPF6_FMT_IDLE   0x60
#define FPF6_FMT_EXCP   0xe0

#define FPF6_V_BSUN     0
#define FPF6_V_INEX12   1
#define FPF6_V_DZ       2
#define FPF6_V_UNFL     3
#define FPF6_V_OPERR    4
#define FPF6_V_OVFL     5
#define FPF6_V_SNAN     6
#define FPF6_V_UNSUP    7

#if defined(_KERNEL)

#include <m68k/signal.h>

#if defined(COMPAT_16)
/*
* Stack frame layout when delivering a signal.
*/
struct sigframe_sigcontext {
       int     sf_ra;                  /* handler return address */
       int     sf_signum;              /* signal number for handler */
       int     sf_code;                /* additional info for handler */
       struct sigcontext *sf_scp;      /* context pointer for handler */
       struct sigcontext sf_sc;        /* actual context */
       struct sigstate sf_state;       /* state of the hardware */
};
#endif

struct sigframe_siginfo {
       int             sf_ra;          /* return address for handler */
       int             sf_signum;      /* "signum" argument for handler */
       siginfo_t       *sf_sip;        /* "sip" argument for handler */
       ucontext_t      *sf_ucp;        /* "ucp" argument for handler */
       siginfo_t       sf_si;          /* actual saved siginfo */
       ucontext_t      sf_uc;          /* actual saved ucontext */
};

/*
* Utility function to relocate the initial frame, make room to restore an
* exception frame and reenter the syscall.
*/
void    reenter_syscall(struct frame *, int) __attribute__((__noreturn__));

/*
* Create an FPU "idle" frame for use by cpu_setmcontext()
*/
extern void m68k_make_fpu_idle_frame(void);
extern struct fpframe m68k_cached_fpu_idle_frame;

void    *getframe(struct lwp *, int, int *);
void    buildcontext(struct lwp *, void *, void *);
#ifdef COMPAT_16
void    sendsig_sigcontext(const ksiginfo_t *, const sigset_t *);
#endif

#ifdef M68040
int     m68040_writeback(struct frame *, int);
#endif

#if defined(__mc68010__)
/*
* Restartable atomic sequence-cased compare-and-swap for atomic_cas ops
* and locking primitives.  We defined this here because it manipulates a
* "clockframe" as prepared by interrupt handlers.
*/
extern char     _atomic_cas_ras_start;
extern char     _atomic_cas_ras_end;

#define ATOMIC_CAS_CHECK(cfp)                                           \
do {                                                                    \
       if (! CLKF_USERMODE(cfp) &&                                     \
           (CLKF_PC(cfp) < (u_long)&_atomic_cas_ras_end &&             \
            CLKF_PC(cfp) > (u_long)&_atomic_cas_ras_start)) {          \
               (cfp)->cf_pc = (u_long)&_atomic_cas_ras_start;          \
       }                                                               \
} while (/*CONSTCOND*/0)
#else
#define ATOMIC_CAS_CHECK(cfp)   /* nothing */
#endif /* __mc68010__ */

static inline void **
getvbr(void)
{
       void **vbr;

       __asm volatile("movc %%vbr,%0" : "=r" (vbr));

       return vbr;
}

static inline void
setvbr(void **vbr)
{
       __asm volatile("movc %0,%%vbr" : : "r" (vbr));
}

#endif  /* _KERNEL */

#endif  /* _M68K_FRAME_H_ */

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