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|
/*
* 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/config.h>
#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 SEGV_MAPERR
pea SIGSEGV
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 TRAP_TRACE
pea SIGTRAP
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_D0+8,%sp),%d0
printf PREGISTER,"{d0->%08x}",1,%d0
rts
fp_get_d1:
move.l (PT_D1+8,%sp),%d0
printf PREGISTER,"{d1->%08x}",1,%d0
rts
fp_get_d2:
move.l (PT_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_D0+8,%sp)
rts
fp_put_d1:
printf PREGISTER,"{d1<-%08x}",1,%d0
move.l %d0,(PT_D1+8,%sp)
rts
fp_put_d2:
printf PREGISTER,"{d2<-%08x}",1,%d0
move.l %d0,(PT_D2+8,%sp)
rts
fp_put_d3:
printf PREGISTER,"{d3<-%08x}",1,%d0
| move.l %d0,%d3
move.l %d0,(PT_D3+8,%sp)
rts
fp_put_d4:
printf PREGISTER,"{d4<-%08x}",1,%d0
| move.l %d0,%d4
move.l %d0,(PT_D4+8,%sp)
rts
fp_put_d5:
printf PREGISTER,"{d5<-%08x}",1,%d0
| move.l %d0,%d5
move.l %d0,(PT_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_A0+8,%sp),%a0
printf PREGISTER,"{a0->%08x}",1,%a0
rts
fp_get_a1:
move.l (PT_A1+8,%sp),%a0
printf PREGISTER,"{a1->%08x}",1,%a0
rts
fp_get_a2:
move.l (PT_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_A0+8,%sp)
rts
fp_put_a1:
printf PREGISTER,"{a1<-%08x}",1,%a0
move.l %a0,(PT_A1+8,%sp)
rts
fp_put_a2:
printf PREGISTER,"{a2<-%08x}",1,%a0
move.l %a0,(PT_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
|
