mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-27 06:30:56 +07:00
e00d82d07f
Acked-by: Alan Cox <alan@redhat.com> Signed-off-by: Matt Waddel <Matt.Waddel@freescale.com> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
277 lines
6.5 KiB
ArmAsm
277 lines
6.5 KiB
ArmAsm
|
|
|
| x_snan.sa 3.3 7/1/91
|
|
|
|
|
| fpsp_snan --- FPSP handler for signalling NAN exception
|
|
|
|
|
| SNAN for float -> integer conversions (integer conversion of
|
|
| an SNAN) is a non-maskable run-time exception.
|
|
|
|
|
| For trap disabled the 040 does the following:
|
|
| If the dest data format is s, d, or x, then the SNAN bit in the NAN
|
|
| is set to one and the resulting non-signaling NAN (truncated if
|
|
| necessary) is transferred to the dest. If the dest format is b, w,
|
|
| or l, then garbage is written to the dest (actually the upper 32 bits
|
|
| of the mantissa are sent to the integer unit).
|
|
|
|
|
| For trap enabled the 040 does the following:
|
|
| If the inst is move_out, then the results are the same as for trap
|
|
| disabled with the exception posted. If the instruction is not move_
|
|
| out, the dest. is not modified, and the exception is posted.
|
|
|
|
|
|
|
| Copyright (C) Motorola, Inc. 1990
|
|
| All Rights Reserved
|
|
|
|
|
| For details on the license for this file, please see the
|
|
| file, README, in this same directory.
|
|
|
|
X_SNAN: |idnt 2,1 | Motorola 040 Floating Point Software Package
|
|
|
|
|section 8
|
|
|
|
#include "fpsp.h"
|
|
|
|
|xref get_fline
|
|
|xref mem_write
|
|
|xref real_snan
|
|
|xref real_inex
|
|
|xref fpsp_done
|
|
|xref reg_dest
|
|
|
|
.global fpsp_snan
|
|
fpsp_snan:
|
|
link %a6,#-LOCAL_SIZE
|
|
fsave -(%a7)
|
|
moveml %d0-%d1/%a0-%a1,USER_DA(%a6)
|
|
fmovemx %fp0-%fp3,USER_FP0(%a6)
|
|
fmoveml %fpcr/%fpsr/%fpiar,USER_FPCR(%a6)
|
|
|
|
|
|
|
| Check if trap enabled
|
|
|
|
|
btstb #snan_bit,FPCR_ENABLE(%a6)
|
|
bnes ena |If enabled, then branch
|
|
|
|
bsrl move_out |else SNAN disabled
|
|
|
|
|
| It is possible to have an inex1 exception with the
|
|
| snan. If the inex enable bit is set in the FPCR, and either
|
|
| inex2 or inex1 occurred, we must clean up and branch to the
|
|
| real inex handler.
|
|
|
|
|
ck_inex:
|
|
moveb FPCR_ENABLE(%a6),%d0
|
|
andb FPSR_EXCEPT(%a6),%d0
|
|
andib #0x3,%d0
|
|
beq end_snan
|
|
|
|
|
| Inexact enabled and reported, and we must take an inexact exception.
|
|
|
|
|
take_inex:
|
|
moveb #INEX_VEC,EXC_VEC+1(%a6)
|
|
moveml USER_DA(%a6),%d0-%d1/%a0-%a1
|
|
fmovemx USER_FP0(%a6),%fp0-%fp3
|
|
fmoveml USER_FPCR(%a6),%fpcr/%fpsr/%fpiar
|
|
frestore (%a7)+
|
|
unlk %a6
|
|
bral real_inex
|
|
|
|
|
| SNAN is enabled. Check if inst is move_out.
|
|
| Make any corrections to the 040 output as necessary.
|
|
|
|
|
ena:
|
|
btstb #5,CMDREG1B(%a6) |if set, inst is move out
|
|
beq not_out
|
|
|
|
bsrl move_out
|
|
|
|
report_snan:
|
|
moveb (%a7),VER_TMP(%a6)
|
|
cmpib #VER_40,(%a7) |test for orig unimp frame
|
|
bnes ck_rev
|
|
moveql #13,%d0 |need to zero 14 lwords
|
|
bras rep_con
|
|
ck_rev:
|
|
moveql #11,%d0 |need to zero 12 lwords
|
|
rep_con:
|
|
clrl (%a7)
|
|
loop1:
|
|
clrl -(%a7) |clear and dec a7
|
|
dbra %d0,loop1
|
|
moveb VER_TMP(%a6),(%a7) |format a busy frame
|
|
moveb #BUSY_SIZE-4,1(%a7)
|
|
movel USER_FPSR(%a6),FPSR_SHADOW(%a6)
|
|
orl #sx_mask,E_BYTE(%a6)
|
|
moveml USER_DA(%a6),%d0-%d1/%a0-%a1
|
|
fmovemx USER_FP0(%a6),%fp0-%fp3
|
|
fmoveml USER_FPCR(%a6),%fpcr/%fpsr/%fpiar
|
|
frestore (%a7)+
|
|
unlk %a6
|
|
bral real_snan
|
|
|
|
|
| Exit snan handler by expanding the unimp frame into a busy frame
|
|
|
|
|
end_snan:
|
|
bclrb #E1,E_BYTE(%a6)
|
|
|
|
moveb (%a7),VER_TMP(%a6)
|
|
cmpib #VER_40,(%a7) |test for orig unimp frame
|
|
bnes ck_rev2
|
|
moveql #13,%d0 |need to zero 14 lwords
|
|
bras rep_con2
|
|
ck_rev2:
|
|
moveql #11,%d0 |need to zero 12 lwords
|
|
rep_con2:
|
|
clrl (%a7)
|
|
loop2:
|
|
clrl -(%a7) |clear and dec a7
|
|
dbra %d0,loop2
|
|
moveb VER_TMP(%a6),(%a7) |format a busy frame
|
|
moveb #BUSY_SIZE-4,1(%a7) |write busy size
|
|
movel USER_FPSR(%a6),FPSR_SHADOW(%a6)
|
|
orl #sx_mask,E_BYTE(%a6)
|
|
moveml USER_DA(%a6),%d0-%d1/%a0-%a1
|
|
fmovemx USER_FP0(%a6),%fp0-%fp3
|
|
fmoveml USER_FPCR(%a6),%fpcr/%fpsr/%fpiar
|
|
frestore (%a7)+
|
|
unlk %a6
|
|
bral fpsp_done
|
|
|
|
|
|
|
| Move_out
|
|
|
|
|
move_out:
|
|
movel EXC_EA(%a6),%a0 |get <ea> from exc frame
|
|
|
|
bfextu CMDREG1B(%a6){#3:#3},%d0 |move rx field to d0{2:0}
|
|
cmpil #0,%d0 |check for long
|
|
beqs sto_long |branch if move_out long
|
|
|
|
cmpil #4,%d0 |check for word
|
|
beqs sto_word |branch if move_out word
|
|
|
|
cmpil #6,%d0 |check for byte
|
|
beqs sto_byte |branch if move_out byte
|
|
|
|
|
|
|
| Not byte, word or long
|
|
|
|
|
rts
|
|
|
|
|
| Get the 32 most significant bits of etemp mantissa
|
|
|
|
|
sto_long:
|
|
movel ETEMP_HI(%a6),%d1
|
|
movel #4,%d0 |load byte count
|
|
|
|
|
| Set signalling nan bit
|
|
|
|
|
bsetl #30,%d1
|
|
|
|
|
| Store to the users destination address
|
|
|
|
|
tstl %a0 |check if <ea> is 0
|
|
beqs wrt_dn |destination is a data register
|
|
|
|
movel %d1,-(%a7) |move the snan onto the stack
|
|
movel %a0,%a1 |load dest addr into a1
|
|
movel %a7,%a0 |load src addr of snan into a0
|
|
bsrl mem_write |write snan to user memory
|
|
movel (%a7)+,%d1 |clear off stack
|
|
rts
|
|
|
|
|
| Get the 16 most significant bits of etemp mantissa
|
|
|
|
|
sto_word:
|
|
movel ETEMP_HI(%a6),%d1
|
|
movel #2,%d0 |load byte count
|
|
|
|
|
| Set signalling nan bit
|
|
|
|
|
bsetl #30,%d1
|
|
|
|
|
| Store to the users destination address
|
|
|
|
|
tstl %a0 |check if <ea> is 0
|
|
beqs wrt_dn |destination is a data register
|
|
|
|
movel %d1,-(%a7) |move the snan onto the stack
|
|
movel %a0,%a1 |load dest addr into a1
|
|
movel %a7,%a0 |point to low word
|
|
bsrl mem_write |write snan to user memory
|
|
movel (%a7)+,%d1 |clear off stack
|
|
rts
|
|
|
|
|
| Get the 8 most significant bits of etemp mantissa
|
|
|
|
|
sto_byte:
|
|
movel ETEMP_HI(%a6),%d1
|
|
movel #1,%d0 |load byte count
|
|
|
|
|
| Set signalling nan bit
|
|
|
|
|
bsetl #30,%d1
|
|
|
|
|
| Store to the users destination address
|
|
|
|
|
tstl %a0 |check if <ea> is 0
|
|
beqs wrt_dn |destination is a data register
|
|
movel %d1,-(%a7) |move the snan onto the stack
|
|
movel %a0,%a1 |load dest addr into a1
|
|
movel %a7,%a0 |point to source byte
|
|
bsrl mem_write |write snan to user memory
|
|
movel (%a7)+,%d1 |clear off stack
|
|
rts
|
|
|
|
|
|
|
| wrt_dn --- write to a data register
|
|
|
|
|
| We get here with D1 containing the data to write and D0 the
|
|
| number of bytes to write: 1=byte,2=word,4=long.
|
|
|
|
|
wrt_dn:
|
|
movel %d1,L_SCR1(%a6) |data
|
|
movel %d0,-(%a7) |size
|
|
bsrl get_fline |returns fline word in d0
|
|
movel %d0,%d1
|
|
andil #0x7,%d1 |d1 now holds register number
|
|
movel (%sp)+,%d0 |get original size
|
|
cmpil #4,%d0
|
|
beqs wrt_long
|
|
cmpil #2,%d0
|
|
bnes wrt_byte
|
|
wrt_word:
|
|
orl #0x8,%d1
|
|
bral reg_dest
|
|
wrt_long:
|
|
orl #0x10,%d1
|
|
bral reg_dest
|
|
wrt_byte:
|
|
bral reg_dest
|
|
|
|
|
| Check if it is a src nan or dst nan
|
|
|
|
|
not_out:
|
|
movel DTAG(%a6),%d0
|
|
bfextu %d0{#0:#3},%d0 |isolate dtag in lsbs
|
|
|
|
cmpib #3,%d0 |check for nan in destination
|
|
bnes issrc |destination nan has priority
|
|
dst_nan:
|
|
btstb #6,FPTEMP_HI(%a6) |check if dest nan is an snan
|
|
bnes issrc |no, so check source for snan
|
|
movew FPTEMP_EX(%a6),%d0
|
|
bras cont
|
|
issrc:
|
|
movew ETEMP_EX(%a6),%d0
|
|
cont:
|
|
btstl #15,%d0 |test for sign of snan
|
|
beqs clr_neg
|
|
bsetb #neg_bit,FPSR_CC(%a6)
|
|
bra report_snan
|
|
clr_neg:
|
|
bclrb #neg_bit,FPSR_CC(%a6)
|
|
bra report_snan
|
|
|
|
|end
|