| gen_except.sa 3.7 1/16/92
|
| gen_except --- FPSP routine to detect reportable exceptions
-|
+|
| This routine compares the exception enable byte of the
| user_fpcr on the stack with the exception status byte
-| of the user_fpsr.
+| of the user_fpsr.
|
| Any routine which may report an exceptions must load
| the stack frame in memory with the exceptional operand(s).
|
| Note: The IEEE standard specifies that inex2 is to be
| reported if ovfl occurs and the ovfl enable bit is not
-| set but the inex2 enable bit is.
+| set but the inex2 enable bit is.
|
|
| 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-| THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA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+| THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA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.
GEN_EXCEPT: |idnt 2,1 | Motorola 040 Floating Point Software Package
|
movel ETEMP_EX(%a6),ETEMP_EX(%a1) |copy etemp from unimp
movel ETEMP_HI(%a6),ETEMP_HI(%a1) |frame to busy frame
- movel ETEMP_LO(%a6),ETEMP_LO(%a1)
+ movel ETEMP_LO(%a6),ETEMP_LO(%a1)
movel CMDREG1B(%a6),CMDREG1B(%a1) |set inst in frame to unimp
movel CMDREG1B(%a6),%d0 |fix cmd1b to make it
andl #0x03c30000,%d0 |work for cmd3b
bfextu CMDREG1B(%a6){#13:#1},%d1 |extract bit 2
- lsll #5,%d1
+ lsll #5,%d1
swap %d1
orl %d1,%d0 |put it in the right place
bfextu CMDREG1B(%a6){#10:#3},%d1 |extract bit 3,4,5
|
| Or in the FPSR from the emulation with the USER_FPSR on the stack.
|
- fmovel %FPSR,%d0
+ fmovel %FPSR,%d0
orl %d0,USER_FPSR(%a6)
movel USER_FPSR(%a6),FPSR_SHADOW(%a1) |set exc bits
orl #sx_mask,E_BYTE(%a1)
cmpib #UNIMP_41_SIZE-4,1(%a7) |test for rev unimp frame
bnel fpsp_fmt_error |if not $28 or $30
leal UNIMP_41_SIZE+LOCAL_SIZE(%a7),%a1
-
+
unimp_con:
|
| Fix up the new unimp frame with entries from the old unimp frame
|
| Or in the FPSR from the emulation with the USER_FPSR on the stack.
|
- fmovel %FPSR,%d0
+ fmovel %FPSR,%d0
orl %d0,USER_FPSR(%a6)
bra do_clean
|
| Frame is idle, so check for exceptions reported through
-| USER_FPSR and set the unimp frame accordingly.
+| USER_FPSR and set the unimp frame accordingly.
| A7 must be incremented to the point before the
| idle fsave vector to the unimp vector.
|
-
+
do_check:
addl #4,%a7 |point A7 back to unimp frame
|
| Or in the FPSR from the emulation with the USER_FPSR on the stack.
|
- fmovel %FPSR,%d0
+ fmovel %FPSR,%d0
orl %d0,USER_FPSR(%a6)
|
| On a busy frame, we must clear the nmnexc bits.
bsun_exc:
bra do_clean
|
-| The typical work to be done to the unimp frame to report an
+| The typical work to be done to the unimp frame to report an
| exception is to set the E1/E3 byte and clr the U flag.
-| commonE1 does this for E1 exceptions, which are snan,
-| operr, and dz. commonE3 does this for E3 exceptions, which
+| commonE1 does this for E1 exceptions, which are snan,
+| operr, and dz. commonE3 does this for E3 exceptions, which
| are inex2 and inex1, and also clears the E1 exception bit
| left over from the unimp exception.
|
unsE3:
tstb RES_FLG(%a6)
- bnes unsE3_0
+ bnes unsE3_0
unsE3_1:
bsetb #E3,E_BYTE(%a6) |set E3 flag
unsE3_0:
movel CMDREG1B(%a6),%d0
andl #0x03c30000,%d0 |work for cmd3b
bfextu CMDREG1B(%a6){#13:#1},%d1 |extract bit 2
- lsll #5,%d1
+ lsll #5,%d1
swap %d1
orl %d1,%d0 |put it in the right place
bfextu CMDREG1B(%a6){#10:#3},%d1 |extract bit 3,4,5
beqs no_exc |if clear, exit
bras ovfl_unfl |go to unfl_ovfl to determine if
| ;it is an unsupp or unimp exc
-
-| No exceptions are to be reported. If the instruction was
+
+| No exceptions are to be reported. If the instruction was
| unimplemented, no FPU restore is necessary. If it was
| unsupported, we must perform the restore.
no_exc:
beqs uni_no_exc
uns_no_exc:
tstb RES_FLG(%a6) |check if frestore is needed
- bne do_clean |if clear, no frestore needed
+ bne do_clean |if clear, no frestore needed
uni_no_exc:
moveml USER_DA(%a6),%d0-%d1/%a0-%a1
fmovemx USER_FP0(%a6),%fp0-%fp3
|
| Unimplemented Instruction Handler:
| Ovfl:
-| Only scosh, setox, ssinh, stwotox, and scale can set overflow in
+| Only scosh, setox, ssinh, stwotox, and scale can set overflow in
| this manner.
| Unfl:
| Stwotox, setox, and scale can set underflow in this manner.
| Any of the other Library Routines such that f(x)=x in which
-| x is an extended denorm can report an underflow exception.
-| It is the responsibility of the exception-causing exception
+| x is an extended denorm can report an underflow exception.
+| It is the responsibility of the exception-causing exception
| to make sure that WBTEMP is correct.
|
| The exceptional operand is in FP_SCR1.
movel CMDREG1B(%a6),%d0 |fix cmd1b to make it
andl #0x03c30000,%d0 |work for cmd3b
bfextu CMDREG1B(%a6){#13:#1},%d1 |extract bit 2
- lsll #5,%d1
+ lsll #5,%d1
swap %d1
orl %d1,%d0 |put it in the right place
bfextu CMDREG1B(%a6){#10:#3},%d1 |extract bit 3,4,5
|
| Check if the frame to be restored is busy or unimp.
|** NOTE *** Bug fix for errata (0d43b #3)
-| If the frame is unimp, we must create a busy frame to
+| If the frame is unimp, we must create a busy frame to
| fix the bug with the nmnexc bits in cases in which they
| are set by a previous instruction and not cleared by
-| the save. The frame will be unimp only if the final
+| the save. The frame will be unimp only if the final
| instruction in an emulation routine caused the exception
| by doing an fmove <ea>,fp0. The exception operand, in
| internal format, is in fptemp.
leal BUSY_SIZE+LOCAL_SIZE(%a7),%a1 |init a1 for new frame
moveb VER_TMP(%a6),(%a7) |write busy fmt word
moveb #BUSY_SIZE-4,1(%a7)
- movel FP_SCR1(%a6),WBTEMP_EX(%a1) |write
+ movel FP_SCR1(%a6),WBTEMP_EX(%a1) |write
movel FP_SCR1+4(%a6),WBTEMP_HI(%a1) |exceptional op to
movel FP_SCR1+8(%a6),WBTEMP_LO(%a1) |wbtemp
| btst.b #E1,E_BYTE(%a1)
bfins %d0,NMCEXC(%a1){#4:#4} |and insert them in nmcexc
movel USER_FPSR(%a6),FPSR_SHADOW(%a1) |set exc bits
orl #sx_mask,E_BYTE(%a1)
-
+
do_restore:
moveml USER_DA(%a6),%d0-%d1/%a0-%a1
fmovemx USER_FP0(%a6),%fp0-%fp3
cont:
unlk %a6
|
-| If trace mode enabled, then go to trace handler. This handler
-| cannot have any fp instructions. If there are fp inst's and an
-| exception has been restored into the machine then the exception
-| will occur upon execution of the fp inst. This is not desirable
+| If trace mode enabled, then go to trace handler. This handler
+| cannot have any fp instructions. If there are fp inst's and an
+| exception has been restored into the machine then the exception
+| will occur upon execution of the fp inst. This is not desirable
| in the kernel (supervisor mode). See MC68040 manual Section 9.3.8.
|
finish_up:
movel USER_D1(%a6),%d1 | restore d1
movel #0x40280000,-(%sp)
frestore (%sp)+
- unlk %a5
+ unlk %a5
rts
frame_41:
tstb 1(%sp) | check to see if idle
- bne notidle
+ bne notidle
idle41:
clrl (%sp) | get rid of old fsave frame
movel %d1,USER_D1(%a6) | save d1
movel USER_D1(%a6),%d1 | restore d1
movel #0x41300000,-(%sp)
frestore (%sp)+
- unlk %a5
+ unlk %a5
rts
notidle:
- bclrb #etemp15_bit,-40(%a5)
+ bclrb #etemp15_bit,-40(%a5)
frestore (%sp)+
- unlk %a5
+ unlk %a5
rts
nofix:
frestore (%sp)+
- unlk %a5
+ unlk %a5
rts
|end
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