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NetBSD/sys/arch/m68k/fpsp/fpsp.h

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* MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
* M68000 Hi-Performance Microprocessor Division
* M68040 Software Package
*
* M68040 Software Package Copyright (c) 1993, 1994 Motorola Inc.
* All rights reserved.
*
* THE SOFTWARE is provided on an "AS IS" basis and without warranty.
* To the maximum extent permitted by applicable law,
* MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED,
* INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
* PARTICULAR PURPOSE and any warranty against infringement with
* regard to the SOFTWARE (INCLUDING ANY MODIFIED VERSIONS THEREOF)
* and any accompanying written materials.
*
* To the maximum extent permitted by applicable law,
* IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
* (INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS
* PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR
* OTHER PECUNIARY LOSS) ARISING OF THE USE OR INABILITY TO USE THE
* SOFTWARE. Motorola assumes no responsibility for the maintenance
* and support of the SOFTWARE.
*
* You are hereby granted a copyright license to use, modify, and
* distribute the SOFTWARE so long as this entire notice is retained
* without alteration in any modified and/or redistributed versions,
* and that such modified versions are clearly identified as such.
* No licenses are granted by implication, estoppel or otherwise
* under any patents or trademarks of Motorola, Inc.
*
* fpsp.h 3.3 3.3
*
* fpsp.h --- stack frame offsets during FPSP exception handling
*
* These equates are used to access the exception frame, the fsave
* frame and any local variables needed by the FPSP package.
*
* All FPSP handlers begin by executing:
*
* link a6,#-LOCAL_SIZE
* fsave -(a7)
* movem.l d0-d1/a0-a1,USER_DA(a6)
* fmovem.x fp0-fp3,USER_FP0(a6)
* fmove.l fpsr/fpcr/fpiar,USER_FPSR(a6)
*
* After initialization, the stack looks like this:
*
* A7 ---> +-------------------------------+
* | |
* | FPU fsave area |
* | |
* +-------------------------------+
* | |
* | FPSP Local Variables |
* | including |
* | saved registers |
* | |
* +-------------------------------+
* A6 ---> | Saved A6 |
* +-------------------------------+
* | |
* | Exception Frame |
* | |
* | |
*
* Positive offsets from A6 refer to the exception frame. Negative
* offsets refer to the Local Variable area and the fsave area.
* The fsave frame is also accessible 'from the top' via A7.
*
* On exit, the handlers execute:
*
* movem.l USER_DA(a6),d0-d1/a0-a1
* fmovem.x USER_FP0(a6),fp0-fp3
* fmove.l USER_FPSR(a6),fpsr/fpcr/fpiar
* frestore (a7)+
* unlk a6
*
* and then either 'bra fpsp_done' if the exception was completely
* handled by the package, or 'bra real_xxxx' which is an external
* label to a routine that will process a real exception of the
* type that was generated. Some handlers may omit the 'frestore'
* if the FPU state after the exception is idle.
*
* Sometimes the exception handler will transform the fsave area
* because it needs to report an exception back to the user. This
* can happen if the package is entered for an unimplemented float
* instruction that generates (say) an underflow. Alternatively,
* a second fsave frame can be pushed onto the stack and the
* handler exit code will reload the new frame and discard the old.
*
* The registers d0, d1, a0, a1 and fp0-fp3 are always saved and
* restored from the 'local variable' area and can be used as
* temporaries. If a routine needs to change any
* of these registers, it should modify the saved copy and let
* the handler exit code restore the value.
*
*----------------------------------------------------------------------
*
* Local Variables on the stack
*
LOCAL_SIZE equ 192 ;bytes needed for local variables
LV equ -LOCAL_SIZE ;convenient base value
*
USER_DA equ LV+0 ;save space for D0-D1,A0-A1
USER_D0 equ LV+0 ;saved user D0
USER_D1 equ LV+4 ;saved user D1
USER_A0 equ LV+8 ;saved user A0
USER_A1 equ LV+12 ;saved user A1
USER_FP0 equ LV+16 ;saved user FP0
USER_FP1 equ LV+28 ;saved user FP1
USER_FP2 equ LV+40 ;saved user FP2
USER_FP3 equ LV+52 ;saved user FP3
USER_FPCR equ LV+64 ;saved user FPCR
FPCR_ENABLE equ USER_FPCR+2 ; FPCR exception enable
FPCR_MODE equ USER_FPCR+3 ; FPCR rounding mode control
USER_FPSR equ LV+68 ;saved user FPSR
FPSR_CC equ USER_FPSR+0 ; FPSR condition code
FPSR_QBYTE equ USER_FPSR+1 ; FPSR quotient
FPSR_EXCEPT equ USER_FPSR+2 ; FPSR exception
FPSR_AEXCEPT equ USER_FPSR+3 ; FPSR accrued exception
USER_FPIAR equ LV+72 ;saved user FPIAR
FP_SCR1 equ LV+76 ;room for a temporary float value
FP_SCR2 equ LV+92 ;room for a temporary float value
L_SCR1 equ LV+108 ;room for a temporary long value
L_SCR2 equ LV+112 ;room for a temporary long value
STORE_FLG equ LV+116
BINDEC_FLG equ LV+117 ;used in bindec
DNRM_FLG equ LV+118 ;used in res_func
RES_FLG equ LV+119 ;used in res_func
DY_MO_FLG equ LV+120 ;dyadic/monadic flag
UFLG_TMP equ LV+121 ;temporary for uflag errata
CU_ONLY equ LV+122 ;cu-only flag
VER_TMP equ LV+123 ;temp holding for version number
L_SCR3 equ LV+124 ;room for a temporary long value
FP_SCR3 equ LV+128 ;room for a temporary float value
FP_SCR4 equ LV+144 ;room for a temporary float value
FP_SCR5 equ LV+160 ;room for a temporary float value
FP_SCR6 equ LV+176
*
*NEXT equ LV+192 ;need to increase LOCAL_SIZE
*
*--------------------------------------------------------------------------
*
* fsave offsets and bit definitions
*
* Offsets are defined from the end of an fsave because the last 10
* words of a busy frame are the same as the unimplemented frame.
*
CU_SAVEPC equ LV-92 ;micro-pc for CU (1 byte)
FPR_DIRTY_BITS equ LV-91 ;fpr dirty bits
*
WBTEMP equ LV-76 ;write back temp (12 bytes)
WBTEMP_EX equ WBTEMP ;wbtemp sign and exponent (2 bytes)
WBTEMP_HI equ WBTEMP+4 ;wbtemp mantissa [63:32] (4 bytes)
WBTEMP_LO equ WBTEMP+8 ;wbtemp mantissa [31:00] (4 bytes)
*
WBTEMP_SGN equ WBTEMP+2 ;used to store sign
*
FPSR_SHADOW equ LV-64 ;fpsr shadow reg
*
FPIARCU equ LV-60 ;Instr. addr. reg. for CU (4 bytes)
*
CMDREG2B equ LV-52 ;cmd reg for machine 2
CMDREG3B equ LV-48 ;cmd reg for E3 exceptions (2 bytes)
*
NMNEXC equ LV-44 ;NMNEXC (unsup,snan bits only)
nmn_unsup_bit equ 1
nmn_snan_bit equ 0
*
NMCEXC equ LV-43 ;NMNEXC & NMCEXC
nmn_operr_bit equ 7
nmn_ovfl_bit equ 6
nmn_unfl_bit equ 5
nmc_unsup_bit equ 4
nmc_snan_bit equ 3
nmc_operr_bit equ 2
nmc_ovfl_bit equ 1
nmc_unfl_bit equ 0
*
STAG equ LV-40 ;source tag (1 byte)
WBTEMP_GRS equ LV-40 ;alias wbtemp guard, round, sticky
guard_bit equ 1 ;guard bit is bit number 1
round_bit equ 0 ;round bit is bit number 0
stag_mask equ $E0 ;upper 3 bits are source tag type
denorm_bit equ 7 ;bit determins if denorm or unnorm
etemp15_bit equ 4 ;etemp exponent bit #15
wbtemp66_bit equ 2 ;wbtemp mantissa bit #66
wbtemp1_bit equ 1 ;wbtemp mantissa bit #1
wbtemp0_bit equ 0 ;wbtemp mantissa bit #0
*
STICKY equ LV-39 ;holds sticky bit
sticky_bit equ 7
*
CMDREG1B equ LV-36 ;cmd reg for E1 exceptions (2 bytes)
kfact_bit equ 12 ;distinguishes static/dynamic k-factor
* ;on packed move out's. NOTE: this
* ;equate only works when CMDREG1B is in
* ;a register.
*
CMDWORD equ LV-35 ;command word in cmd1b
direction_bit equ 5 ;bit 0 in opclass
size_bit2 equ 12 ;bit 2 in size field
*
DTAG equ LV-32 ;dest tag (1 byte)
dtag_mask equ $E0 ;upper 3 bits are dest type tag
fptemp15_bit equ 4 ;fptemp exponent bit #15
*
WB_BYTE equ LV-31 ;holds WBTE15 bit (1 byte)
wbtemp15_bit equ 4 ;wbtemp exponent bit #15
*
E_BYTE equ LV-28 ;holds E1 and E3 bits (1 byte)
E1 equ 2 ;which bit is E1 flag
E3 equ 1 ;which bit is E3 flag
SFLAG equ 0 ;which bit is S flag
*
T_BYTE equ LV-27 ;holds T and U bits (1 byte)
XFLAG equ 7 ;which bit is X flag
UFLAG equ 5 ;which bit is U flag
TFLAG equ 4 ;which bit is T flag
*
FPTEMP equ LV-24 ;fptemp (12 bytes)
FPTEMP_EX equ FPTEMP ;fptemp sign and exponent (2 bytes)
FPTEMP_HI equ FPTEMP+4 ;fptemp mantissa [63:32] (4 bytes)
FPTEMP_LO equ FPTEMP+8 ;fptemp mantissa [31:00] (4 bytes)
*
FPTEMP_SGN equ FPTEMP+2 ;used to store sign
*
ETEMP equ LV-12 ;etemp (12 bytes)
ETEMP_EX equ ETEMP ;etemp sign and exponent (2 bytes)
ETEMP_HI equ ETEMP+4 ;etemp mantissa [63:32] (4 bytes)
ETEMP_LO equ ETEMP+8 ;etemp mantissa [31:00] (4 bytes)
*
ETEMP_SGN equ ETEMP+2 ;used to store sign
*
EXC_SR equ 4 ;exception frame status register
EXC_PC equ 6 ;exception frame program counter
EXC_VEC equ 10 ;exception frame vector (format+vector#)
EXC_EA equ 12 ;exception frame effective address
*
*--------------------------------------------------------------------------
*
* FPSR/FPCR bits
*
neg_bit equ 3 negative result
z_bit equ 2 zero result
inf_bit equ 1 infinity result
nan_bit equ 0 not-a-number result
*
q_sn_bit equ 7 sign bit of quotient byte
*
bsun_bit equ 7 branch on unordered
snan_bit equ 6 signalling nan
operr_bit equ 5 operand error
ovfl_bit equ 4 overflow
unfl_bit equ 3 underflow
dz_bit equ 2 divide by zero
inex2_bit equ 1 inexact result 2
inex1_bit equ 0 inexact result 1
*
aiop_bit equ 7 accrued illegal operation
aovfl_bit equ 6 accrued overflow
aunfl_bit equ 5 accrued underflow
adz_bit equ 4 accrued divide by zero
ainex_bit equ 3 accrued inexact
*
* FPSR individual bit masks
*
neg_mask equ $08000000
z_mask equ $04000000
inf_mask equ $02000000
nan_mask equ $01000000
*
bsun_mask equ $00008000
snan_mask equ $00004000
operr_mask equ $00002000
ovfl_mask equ $00001000
unfl_mask equ $00000800
dz_mask equ $00000400
inex2_mask equ $00000200
inex1_mask equ $00000100
*
aiop_mask equ $00000080 accrued illegal operation
aovfl_mask equ $00000040 accrued overflow
aunfl_mask equ $00000020 accrued underflow
adz_mask equ $00000010 accrued divide by zero
ainex_mask equ $00000008 accrued inexact
*
* FPSR combinations used in the FPSP
*
dzinf_mask equ inf_mask+dz_mask+adz_mask
opnan_mask equ nan_mask+operr_mask+aiop_mask
nzi_mask equ $01ffffff clears N, Z, and I
unfinx_mask equ unfl_mask+inex2_mask+aunfl_mask+ainex_mask
unf2inx_mask equ unfl_mask+inex2_mask+ainex_mask
ovfinx_mask equ ovfl_mask+inex2_mask+aovfl_mask+ainex_mask
inx1a_mask equ inex1_mask+ainex_mask
inx2a_mask equ inex2_mask+ainex_mask
snaniop_mask equ nan_mask+snan_mask+aiop_mask
naniop_mask equ nan_mask+aiop_mask
neginf_mask equ neg_mask+inf_mask
infaiop_mask equ inf_mask+aiop_mask
negz_mask equ neg_mask+z_mask
opaop_mask equ operr_mask+aiop_mask
unfl_inx_mask equ unfl_mask+aunfl_mask+ainex_mask
ovfl_inx_mask equ ovfl_mask+aovfl_mask+ainex_mask
*
*--------------------------------------------------------------------------
*
* FPCR rounding modes
*
x_mode equ $00 round to extended
s_mode equ $40 round to single
d_mode equ $80 round to double
*
rn_mode equ $00 round nearest
rz_mode equ $10 round to zero
rm_mode equ $20 round to minus infinity
rp_mode equ $30 round to plus infinity
*
*--------------------------------------------------------------------------
*
* Miscellaneous equates
*
signan_bit equ 6 signalling nan bit in mantissa
sign_bit equ 7
*
rnd_stky_bit equ 29 round/sticky bit of mantissa
* this can only be used if in a data register
sx_mask equ $01800000 set s and x bits in word $48
*
LOCAL_EX equ 0
LOCAL_SGN equ 2
LOCAL_HI equ 4
LOCAL_LO equ 8
LOCAL_GRS equ 12 valid ONLY for FP_SCR1, FP_SCR2
*
*
norm_tag equ $00 tag bits in {7:5} position
zero_tag equ $20
inf_tag equ $40
nan_tag equ $60
dnrm_tag equ $80
*
* fsave sizes and formats
*
VER_4 equ $40 fpsp compatible version numbers
* are in the $40s {$40-$4f}
VER_40 equ $40 original version number
VER_41 equ $41 revision version number
*
BUSY_SIZE equ 100 size of busy frame
BUSY_FRAME equ LV-BUSY_SIZE start of busy frame
*
UNIMP_40_SIZE equ 44 size of orig unimp frame
UNIMP_41_SIZE equ 52 size of rev unimp frame
*
IDLE_SIZE equ 4 size of idle frame
IDLE_FRAME equ LV-IDLE_SIZE start of idle frame
*
* exception vectors
*
TRACE_VEC equ $2024 trace trap
FLINE_VEC equ $002C 'real' F-line
UNIMP_VEC equ $202C unimplemented
INEX_VEC equ $00C4
*
dbl_thresh equ $3C01
sgl_thresh equ $3F81
*
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