|
| Fixes for bugs: 1238
|
-| Bug: 1238
+| Bug: 1238
|
|
| /* The following dirty_bit clear should be left in
| Copyright (C) Motorola, Inc. 1990
| All Rights Reserved
|
-| THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA
-| The copyright notice above does not evidence any
+| THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA
+| The copyright notice above does not evidence any
| actual or intended publication of such source code.
|BUGFIX idnt 2,1 | Motorola 040 Floating Point Software Package
.global b1238_fix
b1238_fix:
|
-| This code is entered only on completion of the handling of an
-| nu-generated ovfl, unfl, or inex exception. If the version
+| This code is entered only on completion of the handling of an
+| nu-generated ovfl, unfl, or inex exception. If the version
| number of the fsave is not $40, this handler is not necessary.
| Simply branch to fix_done and exit normally.
|
|
moveb CU_SAVEPC(%a6),%d0
andib #0xFE,%d0
- beq fix_done |if zero, this is not bug #1238
+ beq fix_done |if zero, this is not bug #1238
|
| Test the register conflict aspect. If opclass0, check for
-| cu src equal to xu dest or equal to nu dest. If so, go to
+| cu src equal to xu dest or equal to nu dest. If so, go to
| op0. Else, or if opclass2, check for cu dest equal to
| xu dest or equal to nu dest. If so, go to tst_opcl. Else,
| exit, it is not the bug case.
bne op2sgl |not opclass 0, check op2
|
| Check for cu and nu register conflict. If one exists, this takes
-| priority over a cu and xu conflict.
+| priority over a cu and xu conflict.
|
- bfextu CMDREG1B(%a6){#3:#3},%d0 |get 1st src
+ bfextu CMDREG1B(%a6){#3:#3},%d0 |get 1st src
bfextu CMDREG3B(%a6){#6:#3},%d1 |get 3rd dest
cmpb %d0,%d1
beqs op0 |if equal, continue bugfix
|
-| Check for cu dest equal to nu dest. If so, go and fix the
+| Check for cu dest equal to nu dest. If so, go and fix the
| bug condition. Otherwise, exit.
|
- bfextu CMDREG1B(%a6){#6:#3},%d0 |get 1st dest
+ bfextu CMDREG1B(%a6){#6:#3},%d0 |get 1st dest
cmpb %d0,%d1 |cmp 1st dest with 3rd dest
beqs op0 |if equal, continue bugfix
|
bfextu CMDREG2B(%a6){#6:#3},%d1 |get 2nd dest
cmpb %d0,%d1 |cmp 1st dest with 2nd dest
beqs op0_xu |if equal, continue bugfix
- bfextu CMDREG1B(%a6){#3:#3},%d0 |get 1st src
+ bfextu CMDREG1B(%a6){#3:#3},%d0 |get 1st src
cmpb %d0,%d1 |cmp 1st src with 2nd dest
beq op0_xu
bne fix_done |if the reg checks fail, exit
|
| We have the case in which a conflict exists between the cu src or
-| dest and the dest of the xu. We must clear the instruction in
+| dest and the dest of the xu. We must clear the instruction in
| the cu and restore the state, allowing the instruction in the
| xu to complete. Remember, the instruction in the nu
| was exceptional, and was completed by the appropriate handler.
| exceptional, we choose to kill the process.
|
| Items saved from the stack:
-|
+|
| $3c stag - L_SCR1
| $40 cmdreg1b - L_SCR2
| $44 dtag - L_SCR3
| fpu.
|
op0_xu:
- movel STAG(%a6),L_SCR1(%a6)
- movel CMDREG1B(%a6),L_SCR2(%a6)
+ movel STAG(%a6),L_SCR1(%a6)
+ movel CMDREG1B(%a6),L_SCR2(%a6)
movel DTAG(%a6),L_SCR3(%a6)
andil #0xe0000000,L_SCR3(%a6)
moveb #0,CU_SAVEPC(%a6)
fsave -(%a7)
|
| Check if the instruction which just completed was exceptional.
-|
+|
cmpw #0x4060,(%a7)
beq op0_xb
-|
+|
| It is necessary to isolate the result of the instruction in the
| xu if it is to fp0 - fp3 and write that value to the USER_FPn
-| locations on the stack. The correct destination register is in
+| locations on the stack. The correct destination register is in
| cmdreg2b.
|
bfextu CMDREG2B(%a6){#6:#3},%d0 |get dest register no
|
| The frame returned is busy. It is not possible to reconstruct
-| the code sequence to allow completion. We will jump to
+| the code sequence to allow completion. We will jump to
| fpsp_fmt_error and allow the kernel to kill the process.
|
op0_xb:
cmpiw #0x4400,%d0 |test for opclass 2 and size=sgl
bne fix_done |if not, it is not bug 1238
|
-| Check for cu dest equal to nu dest or equal to xu dest, with
+| Check for cu dest equal to nu dest or equal to xu dest, with
| a cu and nu conflict taking priority an nu conflict. If either,
| go and fix the bug condition. Otherwise, exit.
|
- bfextu CMDREG1B(%a6){#6:#3},%d0 |get 1st dest
+ bfextu CMDREG1B(%a6){#6:#3},%d0 |get 1st dest
bfextu CMDREG3B(%a6){#6:#3},%d1 |get 3rd dest
cmpb %d0,%d1 |cmp 1st dest with 3rd dest
beq op2_com |if equal, continue bugfix
- bfextu CMDREG2B(%a6){#6:#3},%d1 |get 2nd dest
+ bfextu CMDREG2B(%a6){#6:#3},%d1 |get 2nd dest
cmpb %d0,%d1 |cmp 1st dest with 2nd dest
bne fix_done |if the reg checks fail, exit
|
| We have the case in which a conflict exists between the cu src or
-| dest and the dest of the xu. We must clear the instruction in
+| dest and the dest of the xu. We must clear the instruction in
| the cu and restore the state, allowing the instruction in the
| xu to complete. Remember, the instruction in the nu
| was exceptional, and was completed by the appropriate handler.
| exceptional, we choose to kill the process.
|
| Items saved from the stack:
-|
+|
| $3c stag - L_SCR1
| $40 cmdreg1b - L_SCR2
| $44 dtag - L_SCR3
| fpu.
|
op2_xu:
- movel STAG(%a6),L_SCR1(%a6)
- movel CMDREG1B(%a6),L_SCR2(%a6)
- movel DTAG(%a6),L_SCR3(%a6)
+ movel STAG(%a6),L_SCR1(%a6)
+ movel CMDREG1B(%a6),L_SCR2(%a6)
+ movel DTAG(%a6),L_SCR3(%a6)
andil #0xe0000000,L_SCR3(%a6)
moveb #0,CU_SAVEPC(%a6)
movel ETEMP(%a6),FP_SCR2(%a6)
fsave -(%a7)
|
| Check if the instruction which just completed was exceptional.
-|
+|
cmpw #0x4060,(%a7)
beq op2_xb
-|
+|
| It is necessary to isolate the result of the instruction in the
| xu if it is to fp0 - fp3 and write that value to the USER_FPn
-| locations on the stack. The correct destination register is in
+| locations on the stack. The correct destination register is in
| cmdreg2b.
|
bfextu CMDREG2B(%a6){#6:#3},%d0 |get dest register no
bnes case2
movew #0x43FF,ETEMP_EX(%a6) |to double +max
bra finish
-case2:
+case2:
cmpw #0xC07F,ETEMP_EX(%a6) |single -max
bnes case3
movew #0xC3FF,ETEMP_EX(%a6) |to double -max
bra finish
-case3:
+case3:
cmpw #0x3F80,ETEMP_EX(%a6) |single +min
bnes case4
movew #0x3C00,ETEMP_EX(%a6) |to double +min
| an fline illegal instruction to be executed.
|
| You should replace the jump to fpsp_fmt_error with a jump
-| to the entry point used to kill a process.
+| to the entry point used to kill a process.
|
op2_xb:
jmp fpsp_fmt_error
git://git.onelab.eu / linux-2.6.git / blobdiff