mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 20:30:57 +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>
468 lines
13 KiB
ArmAsm
468 lines
13 KiB
ArmAsm
|
|
|
| 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.
|
|
|
|
|
| Any routine which may report an exceptions must load
|
|
| the stack frame in memory with the exceptional operand(s).
|
|
|
|
|
| Priority for exceptions is:
|
|
|
|
|
| Highest: bsun
|
|
| snan
|
|
| operr
|
|
| ovfl
|
|
| unfl
|
|
| dz
|
|
| inex2
|
|
| Lowest: inex1
|
|
|
|
|
| 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.
|
|
|
|
|
|
|
|
| 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.
|
|
|
|
GEN_EXCEPT: |idnt 2,1 | Motorola 040 Floating Point Software Package
|
|
|
|
|section 8
|
|
|
|
#include "fpsp.h"
|
|
|
|
|xref real_trace
|
|
|xref fpsp_done
|
|
|xref fpsp_fmt_error
|
|
|
|
exc_tbl:
|
|
.long bsun_exc
|
|
.long commonE1
|
|
.long commonE1
|
|
.long ovfl_unfl
|
|
.long ovfl_unfl
|
|
.long commonE1
|
|
.long commonE3
|
|
.long commonE3
|
|
.long no_match
|
|
|
|
.global gen_except
|
|
gen_except:
|
|
cmpib #IDLE_SIZE-4,1(%a7) |test for idle frame
|
|
beq do_check |go handle idle frame
|
|
cmpib #UNIMP_40_SIZE-4,1(%a7) |test for orig unimp frame
|
|
beqs unimp_x |go handle unimp frame
|
|
cmpib #UNIMP_41_SIZE-4,1(%a7) |test for rev unimp frame
|
|
beqs unimp_x |go handle unimp frame
|
|
cmpib #BUSY_SIZE-4,1(%a7) |if size <> $60, fmt error
|
|
bnel fpsp_fmt_error
|
|
leal BUSY_SIZE+LOCAL_SIZE(%a7),%a1 |init a1 so fpsp.h
|
|
| ;equates will work
|
|
| Fix up the new busy frame with entries from the unimp frame
|
|
|
|
|
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 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
|
|
swap %d1
|
|
orl %d1,%d0 |put it in the right place
|
|
bfextu CMDREG1B(%a6){#10:#3},%d1 |extract bit 3,4,5
|
|
lsll #2,%d1
|
|
swap %d1
|
|
orl %d1,%d0 |put them in the right place
|
|
movel %d0,CMDREG3B(%a1) |in the busy frame
|
|
|
|
|
| Or in the FPSR from the emulation with the USER_FPSR on the stack.
|
|
|
|
|
fmovel %FPSR,%d0
|
|
orl %d0,USER_FPSR(%a6)
|
|
movel USER_FPSR(%a6),FPSR_SHADOW(%a1) |set exc bits
|
|
orl #sx_mask,E_BYTE(%a1)
|
|
bra do_clean
|
|
|
|
|
|
|
| Frame is an unimp frame possible resulting from an fmove <ea>,fp0
|
|
| that caused an exception
|
|
|
|
|
| a1 is modified to point into the new frame allowing fpsp equates
|
|
| to be valid.
|
|
|
|
|
unimp_x:
|
|
cmpib #UNIMP_40_SIZE-4,1(%a7) |test for orig unimp frame
|
|
bnes test_rev
|
|
leal UNIMP_40_SIZE+LOCAL_SIZE(%a7),%a1
|
|
bras unimp_con
|
|
test_rev:
|
|
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
|
|
|
|
|
movel CMDREG1B(%a6),CMDREG1B(%a1) |set inst in frame to unimp
|
|
|
|
|
| Or in the FPSR from the emulation with the USER_FPSR on the stack.
|
|
|
|
|
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.
|
|
| 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
|
|
orl %d0,USER_FPSR(%a6)
|
|
|
|
|
| On a busy frame, we must clear the nmnexc bits.
|
|
|
|
|
cmpib #BUSY_SIZE-4,1(%a7) |check frame type
|
|
bnes check_fr |if busy, clr nmnexc
|
|
clrw NMNEXC(%a6) |clr nmnexc & nmcexc
|
|
btstb #5,CMDREG1B(%a6) |test for fmove out
|
|
bnes frame_com
|
|
movel USER_FPSR(%a6),FPSR_SHADOW(%a6) |set exc bits
|
|
orl #sx_mask,E_BYTE(%a6)
|
|
bras frame_com
|
|
check_fr:
|
|
cmpb #UNIMP_40_SIZE-4,1(%a7)
|
|
beqs frame_com
|
|
clrw NMNEXC(%a6)
|
|
frame_com:
|
|
moveb FPCR_ENABLE(%a6),%d0 |get fpcr enable byte
|
|
andb FPSR_EXCEPT(%a6),%d0 |and in the fpsr exc byte
|
|
bfffo %d0{#24:#8},%d1 |test for first set bit
|
|
leal exc_tbl,%a0 |load jmp table address
|
|
subib #24,%d1 |normalize bit offset to 0-8
|
|
movel (%a0,%d1.w*4),%a0 |load routine address based
|
|
| ;based on first enabled exc
|
|
jmp (%a0) |jump to routine
|
|
|
|
|
| Bsun is not possible in unimp or unsupp
|
|
|
|
|
bsun_exc:
|
|
bra do_clean
|
|
|
|
|
| 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
|
|
| are inex2 and inex1, and also clears the E1 exception bit
|
|
| left over from the unimp exception.
|
|
|
|
|
commonE1:
|
|
bsetb #E1,E_BYTE(%a6) |set E1 flag
|
|
bra commonE |go clean and exit
|
|
|
|
commonE3:
|
|
tstb UFLG_TMP(%a6) |test flag for unsup/unimp state
|
|
bnes unsE3
|
|
uniE3:
|
|
bsetb #E3,E_BYTE(%a6) |set E3 flag
|
|
bclrb #E1,E_BYTE(%a6) |clr E1 from unimp
|
|
bra commonE
|
|
|
|
unsE3:
|
|
tstb RES_FLG(%a6)
|
|
bnes unsE3_0
|
|
unsE3_1:
|
|
bsetb #E3,E_BYTE(%a6) |set E3 flag
|
|
unsE3_0:
|
|
bclrb #E1,E_BYTE(%a6) |clr E1 flag
|
|
movel CMDREG1B(%a6),%d0
|
|
andl #0x03c30000,%d0 |work for cmd3b
|
|
bfextu CMDREG1B(%a6){#13:#1},%d1 |extract bit 2
|
|
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
|
|
lsll #2,%d1
|
|
swap %d1
|
|
orl %d1,%d0 |put them in the right place
|
|
movel %d0,CMDREG3B(%a6) |in the busy frame
|
|
|
|
commonE:
|
|
bclrb #UFLAG,T_BYTE(%a6) |clr U flag from unimp
|
|
bra do_clean |go clean and exit
|
|
|
|
|
| No bits in the enable byte match existing exceptions. Check for
|
|
| the case of the ovfl exc without the ovfl enabled, but with
|
|
| inex2 enabled.
|
|
|
|
|
no_match:
|
|
btstb #inex2_bit,FPCR_ENABLE(%a6) |check for ovfl/inex2 case
|
|
beqs no_exc |if clear, exit
|
|
btstb #ovfl_bit,FPSR_EXCEPT(%a6) |now check ovfl
|
|
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
|
|
| unimplemented, no FPU restore is necessary. If it was
|
|
| unsupported, we must perform the restore.
|
|
no_exc:
|
|
tstb UFLG_TMP(%a6) |test flag for unsupp/unimp state
|
|
beqs uni_no_exc
|
|
uns_no_exc:
|
|
tstb RES_FLG(%a6) |check if frestore is 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
|
|
fmoveml USER_FPCR(%a6),%fpcr/%fpsr/%fpiar
|
|
unlk %a6
|
|
bra finish_up
|
|
|
|
|
| Unsupported Data Type Handler:
|
|
| Ovfl:
|
|
| An fmoveout that results in an overflow is reported this way.
|
|
| Unfl:
|
|
| An fmoveout that results in an underflow is reported this way.
|
|
|
|
|
| Unimplemented Instruction Handler:
|
|
| Ovfl:
|
|
| 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
|
|
| to make sure that WBTEMP is correct.
|
|
|
|
|
| The exceptional operand is in FP_SCR1.
|
|
|
|
|
ovfl_unfl:
|
|
tstb UFLG_TMP(%a6) |test flag for unsupp/unimp state
|
|
beqs ofuf_con
|
|
|
|
|
| The caller was from an unsupported data type trap. Test if the
|
|
| caller set CU_ONLY. If so, the exceptional operand is expected in
|
|
| FPTEMP, rather than WBTEMP.
|
|
|
|
|
tstb CU_ONLY(%a6) |test if inst is cu-only
|
|
beq unsE3
|
|
| move.w #$fe,CU_SAVEPC(%a6)
|
|
clrb CU_SAVEPC(%a6)
|
|
bsetb #E1,E_BYTE(%a6) |set E1 exception flag
|
|
movew ETEMP_EX(%a6),FPTEMP_EX(%a6)
|
|
movel ETEMP_HI(%a6),FPTEMP_HI(%a6)
|
|
movel ETEMP_LO(%a6),FPTEMP_LO(%a6)
|
|
bsetb #fptemp15_bit,DTAG(%a6) |set fpte15
|
|
bclrb #UFLAG,T_BYTE(%a6) |clr U flag from unimp
|
|
bra do_clean |go clean and exit
|
|
|
|
ofuf_con:
|
|
moveb (%a7),VER_TMP(%a6) |save version number
|
|
cmpib #BUSY_SIZE-4,1(%a7) |check for busy frame
|
|
beqs busy_fr |if unimp, grow to busy
|
|
cmpib #VER_40,(%a7) |test for orig unimp frame
|
|
bnes try_41 |if not, test for rev frame
|
|
moveql #13,%d0 |need to zero 14 lwords
|
|
bras ofuf_fin
|
|
try_41:
|
|
cmpib #VER_41,(%a7) |test for rev unimp frame
|
|
bnel fpsp_fmt_error |if neither, exit with error
|
|
moveql #11,%d0 |need to zero 12 lwords
|
|
|
|
ofuf_fin:
|
|
clrl (%a7)
|
|
loop1:
|
|
clrl -(%a7) |clear and dec a7
|
|
dbra %d0,loop1
|
|
moveb VER_TMP(%a6),(%a7)
|
|
moveb #BUSY_SIZE-4,1(%a7) |write busy fmt word.
|
|
busy_fr:
|
|
movel FP_SCR1(%a6),WBTEMP_EX(%a6) |write
|
|
movel FP_SCR1+4(%a6),WBTEMP_HI(%a6) |exceptional op to
|
|
movel FP_SCR1+8(%a6),WBTEMP_LO(%a6) |wbtemp
|
|
bsetb #E3,E_BYTE(%a6) |set E3 flag
|
|
bclrb #E1,E_BYTE(%a6) |make sure E1 is clear
|
|
bclrb #UFLAG,T_BYTE(%a6) |clr U flag
|
|
movel USER_FPSR(%a6),FPSR_SHADOW(%a6)
|
|
orl #sx_mask,E_BYTE(%a6)
|
|
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
|
|
swap %d1
|
|
orl %d1,%d0 |put it in the right place
|
|
bfextu CMDREG1B(%a6){#10:#3},%d1 |extract bit 3,4,5
|
|
lsll #2,%d1
|
|
swap %d1
|
|
orl %d1,%d0 |put them in the right place
|
|
movel %d0,CMDREG3B(%a6) |in the busy frame
|
|
|
|
|
|
|
| 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
|
|
| 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
|
|
| instruction in an emulation routine caused the exception
|
|
| by doing an fmove <ea>,fp0. The exception operand, in
|
|
| internal format, is in fptemp.
|
|
|
|
|
do_clean:
|
|
cmpib #UNIMP_40_SIZE-4,1(%a7)
|
|
bnes do_con
|
|
moveql #13,%d0 |in orig, need to zero 14 lwords
|
|
bras do_build
|
|
do_con:
|
|
cmpib #UNIMP_41_SIZE-4,1(%a7)
|
|
bnes do_restore |frame must be busy
|
|
moveql #11,%d0 |in rev, need to zero 12 lwords
|
|
|
|
do_build:
|
|
moveb (%a7),VER_TMP(%a6)
|
|
clrl (%a7)
|
|
loop2:
|
|
clrl -(%a7) |clear and dec a7
|
|
dbra %d0,loop2
|
|
|
|
|
| Use a1 as pointer into new frame. a6 is not correct if an unimp or
|
|
| busy frame was created as the result of an exception on the final
|
|
| instruction of an emulation routine.
|
|
|
|
|
| We need to set the nmcexc bits if the exception is E1. Otherwise,
|
|
| the exc taken will be inex2.
|
|
|
|
|
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+4(%a6),WBTEMP_HI(%a1) |exceptional op to
|
|
movel FP_SCR1+8(%a6),WBTEMP_LO(%a1) |wbtemp
|
|
| btst.b #E1,E_BYTE(%a1)
|
|
| beq.b do_restore
|
|
bfextu USER_FPSR(%a6){#17:#4},%d0 |get snan/operr/ovfl/unfl bits
|
|
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
|
|
fmoveml USER_FPCR(%a6),%fpcr/%fpsr/%fpiar
|
|
frestore (%a7)+
|
|
tstb RES_FLG(%a6) |RES_FLG indicates a "continuation" frame
|
|
beq cont
|
|
bsr bug1384
|
|
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
|
|
| in the kernel (supervisor mode). See MC68040 manual Section 9.3.8.
|
|
|
|
|
finish_up:
|
|
btstb #7,(%a7) |test T1 in SR
|
|
bnes g_trace
|
|
btstb #6,(%a7) |test T0 in SR
|
|
bnes g_trace
|
|
bral fpsp_done
|
|
|
|
|
| Change integer stack to look like trace stack
|
|
| The address of the instruction that caused the
|
|
| exception is already in the integer stack (is
|
|
| the same as the saved friar)
|
|
|
|
|
| If the current frame is already a 6-word stack then all
|
|
| that needs to be done is to change the vector# to TRACE.
|
|
| If the frame is only a 4-word stack (meaning we got here
|
|
| on an Unsupported data type exception), then we need to grow
|
|
| the stack an extra 2 words and get the FPIAR from the FPU.
|
|
|
|
|
g_trace:
|
|
bftst EXC_VEC-4(%sp){#0:#4}
|
|
bne g_easy
|
|
|
|
subw #4,%sp | make room
|
|
movel 4(%sp),(%sp)
|
|
movel 8(%sp),4(%sp)
|
|
subw #BUSY_SIZE,%sp
|
|
fsave (%sp)
|
|
fmovel %fpiar,BUSY_SIZE+EXC_EA-4(%sp)
|
|
frestore (%sp)
|
|
addw #BUSY_SIZE,%sp
|
|
|
|
g_easy:
|
|
movew #TRACE_VEC,EXC_VEC-4(%a7)
|
|
bral real_trace
|
|
|
|
|
| This is a work-around for hardware bug 1384.
|
|
|
|
|
bug1384:
|
|
link %a5,#0
|
|
fsave -(%sp)
|
|
cmpib #0x41,(%sp) | check for correct frame
|
|
beq frame_41
|
|
bgt nofix | if more advanced mask, do nada
|
|
|
|
frame_40:
|
|
tstb 1(%sp) | check to see if idle
|
|
bne notidle
|
|
idle40:
|
|
clrl (%sp) | get rid of old fsave frame
|
|
movel %d1,USER_D1(%a6) | save d1
|
|
movew #8,%d1 | place unimp frame instead
|
|
loop40: clrl -(%sp)
|
|
dbra %d1,loop40
|
|
movel USER_D1(%a6),%d1 | restore d1
|
|
movel #0x40280000,-(%sp)
|
|
frestore (%sp)+
|
|
unlk %a5
|
|
rts
|
|
|
|
frame_41:
|
|
tstb 1(%sp) | check to see if idle
|
|
bne notidle
|
|
idle41:
|
|
clrl (%sp) | get rid of old fsave frame
|
|
movel %d1,USER_D1(%a6) | save d1
|
|
movew #10,%d1 | place unimp frame instead
|
|
loop41: clrl -(%sp)
|
|
dbra %d1,loop41
|
|
movel USER_D1(%a6),%d1 | restore d1
|
|
movel #0x41300000,-(%sp)
|
|
frestore (%sp)+
|
|
unlk %a5
|
|
rts
|
|
|
|
notidle:
|
|
bclrb #etemp15_bit,-40(%a5)
|
|
frestore (%sp)+
|
|
unlk %a5
|
|
rts
|
|
|
|
nofix:
|
|
frestore (%sp)+
|
|
unlk %a5
|
|
rts
|
|
|
|
|end
|