|
-| kernel_ex.sa 3.3 12/19/90
+| kernel_ex.sa 3.3 12/19/90
|
-| This file contains routines to force exception status in the
+| This file contains routines to force exception status in the
| fpu for exceptional cases detected or reported within the
| transcendental functions. Typically, the t_xx routine will
| set the appropriate bits in the USER_FPSR word on the stack.
| The bits are tested in gen_except.sa to determine if an exceptional
-| situation needs to be created on return from the FPSP.
+| situation needs to be created on return from the FPSP.
|
| 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-| THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA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+| THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA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.
KERNEL_EX: |idnt 2,1 | Motorola 040 Floating Point Software Package
|xref unf_sub
|xref nrm_set
- .global t_dz
+ .global t_dz
.global t_dz2
.global t_operr
.global t_unfl
|
| if dz trap disabled
| store properly signed inf (use sign of etemp) into fp0
-| set FPSR exception status dz bit, condition code
+| set FPSR exception status dz bit, condition code
| inf bit, and accrued dz bit
| return
| frestore the frame into the machine (done by unimp_hd)
| frestore the frame into the machine (done by unimp_hd)
|
| t_dz2 is used by monadic functions such as flogn (from do_func).
-| t_dz is used by monadic functions such as satanh (from the
+| t_dz is used by monadic functions such as satanh (from the
| transcendental function).
|
t_dz2:
| OPERR exception
|
| if (operr trap disabled)
-| set FPSR exception status operr bit, condition code
+| set FPSR exception status operr bit, condition code
| nan bit; Store default NAN into fp0
| frestore the frame into the machine (done by unimp_hd)
-|
+|
| else (operr trap enabled)
| set FPSR exception status operr bit, accrued operr bit
| set flag to disable sto_res from corrupting fp register
unfl_dis:
bfextu FPCR_MODE(%a6){#0:#2},%d0 |get round precision
-
+
bclrb #sign_bit,LOCAL_EX(%a0)
sne LOCAL_SGN(%a0) |convert to internal ext format
bsr unf_sub |returns IEEE result at a0
| ;and sets FPSR_CC accordingly
-
+
bfclr LOCAL_SGN(%a0){#0:#8} |convert back to IEEE ext format
beqs unfl_fin
unfl_fin:
fmovemx (%a0),%fp0-%fp0 |store result in fp0
rts
-
+
|
| t_ovfl2 --- OVFL exception (without inex2 returned)
| DST_NAN
|
| Determine if the destination nan is signalling or non-signalling,
-| and set the FPSR bits accordingly. See the MC68040 User's Manual
+| and set the FPSR bits accordingly. See the MC68040 User's Manual
| section 3.2.2.5 NOT-A-NUMBERS.
|
dst_nan:
beqs dst_pos |if clr, it was positive
bsetb #neg_bit,FPSR_CC(%a6) |set N bit
dst_pos:
- btstb #signan_bit,FPTEMP_HI(%a6) |check if signalling
+ btstb #signan_bit,FPTEMP_HI(%a6) |check if signalling
beqs dst_snan |branch if signalling
fmovel %d1,%fpcr |restore user's rmode/prec
andib #0xe0,%d0
cmpib #0x60,%d0
bnes no_snan
- btstb #signan_bit,ETEMP_HI(%a6) |check if signalling
+ btstb #signan_bit,ETEMP_HI(%a6) |check if signalling
bnes no_snan
orl #snaniop_mask,USER_FPSR(%a6) |set NAN, SNAN, AIOP
no_snan:
- rts
+ rts
dst_snan:
- btstb #snan_bit,FPCR_ENABLE(%a6) |check if trap enabled
+ btstb #snan_bit,FPCR_ENABLE(%a6) |check if trap enabled
beqs dst_dis |branch if disabled
orb #nan_tag,DTAG(%a6) |set up dtag for nan
rts
dst_dis:
- bsetb #signan_bit,FPTEMP_HI(%a6) |set SNAN bit in sop
+ bsetb #signan_bit,FPTEMP_HI(%a6) |set SNAN bit in sop
fmovel %d1,%fpcr |restore user's rmode/prec
- fmovex FPTEMP(%a6),%fp0 |load non-sign. nan
+ fmovex FPTEMP(%a6),%fp0 |load non-sign. nan
orl #snaniop_mask,USER_FPSR(%a6) |set NAN, SNAN, AIOP
rts
| SRC_NAN
|
| Determine if the source nan is signalling or non-signalling,
-| and set the FPSR bits accordingly. See the MC68040 User's Manual
+| and set the FPSR bits accordingly. See the MC68040 User's Manual
| section 3.2.2.5 NOT-A-NUMBERS.
|
src_nan:
beqs src_pos |if clr, it was positive
bsetb #neg_bit,FPSR_CC(%a6) |set N bit
src_pos:
- btstb #signan_bit,ETEMP_HI(%a6) |check if signalling
+ btstb #signan_bit,ETEMP_HI(%a6) |check if signalling
beqs src_snan |branch if signalling
fmovel %d1,%fpcr |restore user's rmode/prec
fmovex ETEMP(%a6),%fp0 |return the non-signalling nan
- rts
+ rts
src_snan:
- btstb #snan_bit,FPCR_ENABLE(%a6) |check if trap enabled
+ btstb #snan_bit,FPCR_ENABLE(%a6) |check if trap enabled
beqs src_dis |branch if disabled
- bsetb #signan_bit,ETEMP_HI(%a6) |set SNAN bit in sop
+ bsetb #signan_bit,ETEMP_HI(%a6) |set SNAN bit in sop
orb #norm_tag,DTAG(%a6) |set up dtag for norm
orb #nan_tag,STAG(%a6) |set up stag for nan
st STORE_FLG(%a6) |do not store a result
rts
src_dis:
- bsetb #signan_bit,ETEMP_HI(%a6) |set SNAN bit in sop
+ bsetb #signan_bit,ETEMP_HI(%a6) |set SNAN bit in sop
fmovel %d1,%fpcr |restore user's rmode/prec
- fmovex ETEMP(%a6),%fp0 |load non-sign. nan
+ fmovex ETEMP(%a6),%fp0 |load non-sign. nan
orl #snaniop_mask,USER_FPSR(%a6) |set NAN, SNAN, AIOP
rts
bras xdnrm_con
|
| Entry point for scale with extended denorm. The function does
-| not set inex2, aunfl, or ainex.
+| not set inex2, aunfl, or ainex.
|
t_resdnrm:
orl #unfl_mask,USER_FPSR(%a6)
bfclr LOCAL_SGN(%a0){#0:#8} |change back to IEEE ext format
beqs xdep
bsetb #sign_bit,LOCAL_EX(%a0)
-xdep:
+xdep:
bfclr STAG(%a6){#5:#3} |clear wbtm66,wbtm1,wbtm0
bsetb #wbtemp15_bit,WB_BYTE(%a6) |set wbtemp15
bclrb #sticky_bit,STICKY(%a6) |clear sticky bit
|
.global t_avoid_unsupp
t_avoid_unsupp:
- link %a2,#-LOCAL_SIZE |so that a2 fpsp.h negative
+ link %a2,#-LOCAL_SIZE |so that a2 fpsp.h negative
| ;offsets may be used
fsave -(%a7)
tstb 1(%a7) |check if idle, exit if so
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