/*
 * fp_emu.S
 *
 * Copyright Roman Zippel, 1997.  All rights reserved.
 *
 * 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, and the entire permission notice in its entirety,
 *    including the disclaimer of warranties.
 * 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. The name of the author may not be used to endorse or promote
 *    products derived from this software without specific prior
 *    written permission.
 *
 * ALTERNATIVELY, this product may be distributed under the terms of
 * the GNU General Public License, in which case the provisions of the GPL are
 * required INSTEAD OF the above restrictions.  (This clause is
 * necessary due to a potential bad interaction between the GPL and
 * the restrictions contained in a BSD-style copyright.)
 *
 * THIS SOFTWARE IS PROVIDED ``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 AUTHOR 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.
 */

#include <linux/linkage.h>
#include <asm/entry.h>

#include "fp_emu.h"

        .globl  fpu_emu
        .globl  fp_debugprint
        .globl  fp_err_ua1,fp_err_ua2

        .text
fpu_emu:
        SAVE_ALL_INT
        GET_CURRENT(%d0)

#if defined(CPU_M68020_OR_M68030) && defined(CPU_M68040_OR_M68060)
        tst.l   m68k_is040or060
        jeq     1f
#endif
#if defined(CPU_M68040_OR_M68060)
        move.l  (FPS_PC2,%sp),(FPS_PC,%sp)
#endif
1:
        | emulate the instruction
        jsr     fp_scan

#if defined(CONFIG_M68060)
#if !defined(CPU_M68060_ONLY)
        btst    #3,m68k_cputype+3
        jeq     1f
#endif
        btst    #7,(FPS_SR,%sp)
        jne     fp_sendtrace060
#endif
1:
        | emulation successful?
        tst.l   %d0
        jeq     ret_from_exception

        | send some signal to program here

        jra     ret_from_exception

        | we jump here after an access error while trying to access
        | user space, we correct stackpointer and send a SIGSEGV to
        | the user process
fp_err_ua2:
        addq.l  #4,%sp
fp_err_ua1:
        addq.l  #4,%sp
        move.l  %a0,-(%sp)
        pea     LSEGV_MAPERR
        pea     LSIGSEGV
        jsr     fpemu_signal
        add.w   #12,%sp
        jra     ret_from_exception

#if defined(CONFIG_M68060)
        | send a trace signal if we are debugged
        | it does not really belong here, but...
fp_sendtrace060:
        move.l  (FPS_PC,%sp),-(%sp)
        pea     LTRAP_TRACE
        pea     LSIGTRAP
        jsr     fpemu_signal
        add.w   #12,%sp
        jra     ret_from_exception
#endif

        .globl  fp_get_data_reg, fp_put_data_reg
        .globl  fp_get_addr_reg, fp_put_addr_reg

        | Entry points to get/put a register. Some of them can be get/put
        | directly, others are on the stack, as we read/write the stack
        | directly here, these function may only be called from within
        | instruction decoding, otherwise the stack pointer is incorrect
        | and the stack gets corrupted.
fp_get_data_reg:
        jmp     ([0f:w,%pc,%d0.w*4])

        .align  4
0:
        .long   fp_get_d0, fp_get_d1
        .long   fp_get_d2, fp_get_d3
        .long   fp_get_d4, fp_get_d5
        .long   fp_get_d6, fp_get_d7

fp_get_d0:
        move.l  (PT_OFF_D0+8,%sp),%d0
        printf  PREGISTER,"{d0->%08x}",1,%d0
        rts

fp_get_d1:
        move.l  (PT_OFF_D1+8,%sp),%d0
        printf  PREGISTER,"{d1->%08x}",1,%d0
        rts

fp_get_d2:
        move.l  (PT_OFF_D2+8,%sp),%d0
        printf  PREGISTER,"{d2->%08x}",1,%d0
        rts

fp_get_d3:
        move.l  %d3,%d0
        printf  PREGISTER,"{d3->%08x}",1,%d0
        rts

fp_get_d4:
        move.l  %d4,%d0
        printf  PREGISTER,"{d4->%08x}",1,%d0
        rts

fp_get_d5:
        move.l  %d5,%d0
        printf  PREGISTER,"{d5->%08x}",1,%d0
        rts

fp_get_d6:
        move.l  %d6,%d0
        printf  PREGISTER,"{d6->%08x}",1,%d0
        rts

fp_get_d7:
        move.l  %d7,%d0
        printf  PREGISTER,"{d7->%08x}",1,%d0
        rts

fp_put_data_reg:
        jmp     ([0f:w,%pc,%d1.w*4])

        .align  4
0:
        .long   fp_put_d0, fp_put_d1
        .long   fp_put_d2, fp_put_d3
        .long   fp_put_d4, fp_put_d5
        .long   fp_put_d6, fp_put_d7

fp_put_d0:
        printf  PREGISTER,"{d0<-%08x}",1,%d0
        move.l  %d0,(PT_OFF_D0+8,%sp)
        rts

fp_put_d1:
        printf  PREGISTER,"{d1<-%08x}",1,%d0
        move.l  %d0,(PT_OFF_D1+8,%sp)
        rts

fp_put_d2:
        printf  PREGISTER,"{d2<-%08x}",1,%d0
        move.l  %d0,(PT_OFF_D2+8,%sp)
        rts

fp_put_d3:
        printf  PREGISTER,"{d3<-%08x}",1,%d0
|       move.l  %d0,%d3
        move.l  %d0,(PT_OFF_D3+8,%sp)
        rts

fp_put_d4:
        printf  PREGISTER,"{d4<-%08x}",1,%d0
|       move.l  %d0,%d4
        move.l  %d0,(PT_OFF_D4+8,%sp)
        rts

fp_put_d5:
        printf  PREGISTER,"{d5<-%08x}",1,%d0
|       move.l  %d0,%d5
        move.l  %d0,(PT_OFF_D5+8,%sp)
        rts

fp_put_d6:
        printf  PREGISTER,"{d6<-%08x}",1,%d0
        move.l  %d0,%d6
        rts

fp_put_d7:
        printf  PREGISTER,"{d7<-%08x}",1,%d0
        move.l  %d0,%d7
        rts

fp_get_addr_reg:
        jmp     ([0f:w,%pc,%d0.w*4])

        .align  4
0:
        .long   fp_get_a0, fp_get_a1
        .long   fp_get_a2, fp_get_a3
        .long   fp_get_a4, fp_get_a5
        .long   fp_get_a6, fp_get_a7

fp_get_a0:
        move.l  (PT_OFF_A0+8,%sp),%a0
        printf  PREGISTER,"{a0->%08x}",1,%a0
        rts

fp_get_a1:
        move.l  (PT_OFF_A1+8,%sp),%a0
        printf  PREGISTER,"{a1->%08x}",1,%a0
        rts

fp_get_a2:
        move.l  (PT_OFF_A2+8,%sp),%a0
        printf  PREGISTER,"{a2->%08x}",1,%a0
        rts

fp_get_a3:
        move.l  %a3,%a0
        printf  PREGISTER,"{a3->%08x}",1,%a0
        rts

fp_get_a4:
        move.l  %a4,%a0
        printf  PREGISTER,"{a4->%08x}",1,%a0
        rts

fp_get_a5:
        move.l  %a5,%a0
        printf  PREGISTER,"{a5->%08x}",1,%a0
        rts

fp_get_a6:
        move.l  %a6,%a0
        printf  PREGISTER,"{a6->%08x}",1,%a0
        rts

fp_get_a7:
        move.l  %usp,%a0
        printf  PREGISTER,"{a7->%08x}",1,%a0
        rts

fp_put_addr_reg:
        jmp     ([0f:w,%pc,%d0.w*4])

        .align  4
0:
        .long   fp_put_a0, fp_put_a1
        .long   fp_put_a2, fp_put_a3
        .long   fp_put_a4, fp_put_a5
        .long   fp_put_a6, fp_put_a7

fp_put_a0:
        printf  PREGISTER,"{a0<-%08x}",1,%a0
        move.l  %a0,(PT_OFF_A0+8,%sp)
        rts

fp_put_a1:
        printf  PREGISTER,"{a1<-%08x}",1,%a0
        move.l  %a0,(PT_OFF_A1+8,%sp)
        rts

fp_put_a2:
        printf  PREGISTER,"{a2<-%08x}",1,%a0
        move.l  %a0,(PT_OFF_A2+8,%sp)
        rts

fp_put_a3:
        printf  PREGISTER,"{a3<-%08x}",1,%a0
        move.l  %a0,%a3
        rts

fp_put_a4:
        printf  PREGISTER,"{a4<-%08x}",1,%a0
        move.l  %a0,%a4
        rts

fp_put_a5:
        printf  PREGISTER,"{a5<-%08x}",1,%a0
        move.l  %a0,%a5
        rts

fp_put_a6:
        printf  PREGISTER,"{a6<-%08x}",1,%a0
        move.l  %a0,%a6
        rts

fp_put_a7:
        printf  PREGISTER,"{a7<-%08x}",1,%a0
        move.l  %a0,%usp
        rts

        .data
        .align  4

fp_debugprint:
|       .long   PMDECODE
        .long   PMINSTR+PMDECODE+PMCONV+PMNORM
|       .long   PMCONV+PMNORM+PMINSTR
|       .long   0