fpsp.h
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- |
- | fpsp.h 3.3 3.3
- |
- | Copyright (C) Motorola, Inc. 1990
- | All Rights Reserved
- |
- | THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA
- | The copyright notice above does not evidence any
- | actual or intended publication of such source code.
- | 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
- |
- .set LOCAL_SIZE,192 | bytes needed for local variables
- .set LV,-LOCAL_SIZE | convenient base value
- |
- .set USER_DA,LV+0 | save space for D0-D1,A0-A1
- .set USER_D0,LV+0 | saved user D0
- .set USER_D1,LV+4 | saved user D1
- .set USER_A0,LV+8 | saved user A0
- .set USER_A1,LV+12 | saved user A1
- .set USER_FP0,LV+16 | saved user FP0
- .set USER_FP1,LV+28 | saved user FP1
- .set USER_FP2,LV+40 | saved user FP2
- .set USER_FP3,LV+52 | saved user FP3
- .set USER_FPCR,LV+64 | saved user FPCR
- .set FPCR_ENABLE,USER_FPCR+2 | FPCR exception enable
- .set FPCR_MODE,USER_FPCR+3 | FPCR rounding mode control
- .set USER_FPSR,LV+68 | saved user FPSR
- .set FPSR_CC,USER_FPSR+0 | FPSR condition code
- .set FPSR_QBYTE,USER_FPSR+1 | FPSR quotient
- .set FPSR_EXCEPT,USER_FPSR+2 | FPSR exception
- .set FPSR_AEXCEPT,USER_FPSR+3 | FPSR accrued exception
- .set USER_FPIAR,LV+72 | saved user FPIAR
- .set FP_SCR1,LV+76 | room for a temporary float value
- .set FP_SCR2,LV+92 | room for a temporary float value
- .set L_SCR1,LV+108 | room for a temporary long value
- .set L_SCR2,LV+112 | room for a temporary long value
- .set STORE_FLG,LV+116
- .set BINDEC_FLG,LV+117 | used in bindec
- .set DNRM_FLG,LV+118 | used in res_func
- .set RES_FLG,LV+119 | used in res_func
- .set DY_MO_FLG,LV+120 | dyadic/monadic flag
- .set UFLG_TMP,LV+121 | temporary for uflag errata
- .set CU_ONLY,LV+122 | cu-only flag
- .set VER_TMP,LV+123 | temp holding for version number
- .set L_SCR3,LV+124 | room for a temporary long value
- .set FP_SCR3,LV+128 | room for a temporary float value
- .set FP_SCR4,LV+144 | room for a temporary float value
- .set FP_SCR5,LV+160 | room for a temporary float value
- .set FP_SCR6,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.
- |
- .set CU_SAVEPC,LV-92 | micro-pc for CU (1 byte)
- .set FPR_DIRTY_BITS,LV-91 | fpr dirty bits
- |
- .set WBTEMP,LV-76 | write back temp (12 bytes)
- .set WBTEMP_EX,WBTEMP | wbtemp sign and exponent (2 bytes)
- .set WBTEMP_HI,WBTEMP+4 | wbtemp mantissa [63:32] (4 bytes)
- .set WBTEMP_LO,WBTEMP+8 | wbtemp mantissa [31:00] (4 bytes)
- |
- .set WBTEMP_SGN,WBTEMP+2 | used to store sign
- |
- .set FPSR_SHADOW,LV-64 | fpsr shadow reg
- |
- .set FPIARCU,LV-60 | Instr. addr. reg. for CU (4 bytes)
- |
- .set CMDREG2B,LV-52 | cmd reg for machine 2
- .set CMDREG3B,LV-48 | cmd reg for E3 exceptions (2 bytes)
- |
- .set NMNEXC,LV-44 | NMNEXC (unsup,snan bits only)
- .set nmn_unsup_bit,1 |
- .set nmn_snan_bit,0 |
- |
- .set NMCEXC,LV-43 | NMNEXC & NMCEXC
- .set nmn_operr_bit,7
- .set nmn_ovfl_bit,6
- .set nmn_unfl_bit,5
- .set nmc_unsup_bit,4
- .set nmc_snan_bit,3
- .set nmc_operr_bit,2
- .set nmc_ovfl_bit,1
- .set nmc_unfl_bit,0
- |
- .set STAG,LV-40 | source tag (1 byte)
- .set WBTEMP_GRS,LV-40 | alias wbtemp guard, round, sticky
- .set guard_bit,1 | guard bit is bit number 1
- .set round_bit,0 | round bit is bit number 0
- .set stag_mask,0xE0 | upper 3 bits are source tag type
- .set denorm_bit,7 | bit determines if denorm or unnorm
- .set etemp15_bit,4 | etemp exponent bit #15
- .set wbtemp66_bit,2 | wbtemp mantissa bit #66
- .set wbtemp1_bit,1 | wbtemp mantissa bit #1
- .set wbtemp0_bit,0 | wbtemp mantissa bit #0
- |
- .set STICKY,LV-39 | holds sticky bit
- .set sticky_bit,7
- |
- .set CMDREG1B,LV-36 | cmd reg for E1 exceptions (2 bytes)
- .set kfact_bit,12 | distinguishes static/dynamic k-factor
- | ;on packed move outs. NOTE: this
- | ;equate only works when CMDREG1B is in
- | ;a register.
- |
- .set CMDWORD,LV-35 | command word in cmd1b
- .set direction_bit,5 | bit 0 in opclass
- .set size_bit2,12 | bit 2 in size field
- |
- .set DTAG,LV-32 | dest tag (1 byte)
- .set dtag_mask,0xE0 | upper 3 bits are dest type tag
- .set fptemp15_bit,4 | fptemp exponent bit #15
- |
- .set WB_BYTE,LV-31 | holds WBTE15 bit (1 byte)
- .set wbtemp15_bit,4 | wbtemp exponent bit #15
- |
- .set E_BYTE,LV-28 | holds E1 and E3 bits (1 byte)
- .set E1,2 | which bit is E1 flag
- .set E3,1 | which bit is E3 flag
- .set SFLAG,0 | which bit is S flag
- |
- .set T_BYTE,LV-27 | holds T and U bits (1 byte)
- .set XFLAG,7 | which bit is X flag
- .set UFLAG,5 | which bit is U flag
- .set TFLAG,4 | which bit is T flag
- |
- .set FPTEMP,LV-24 | fptemp (12 bytes)
- .set FPTEMP_EX,FPTEMP | fptemp sign and exponent (2 bytes)
- .set FPTEMP_HI,FPTEMP+4 | fptemp mantissa [63:32] (4 bytes)
- .set FPTEMP_LO,FPTEMP+8 | fptemp mantissa [31:00] (4 bytes)
- |
- .set FPTEMP_SGN,FPTEMP+2 | used to store sign
- |
- .set ETEMP,LV-12 | etemp (12 bytes)
- .set ETEMP_EX,ETEMP | etemp sign and exponent (2 bytes)
- .set ETEMP_HI,ETEMP+4 | etemp mantissa [63:32] (4 bytes)
- .set ETEMP_LO,ETEMP+8 | etemp mantissa [31:00] (4 bytes)
- |
- .set ETEMP_SGN,ETEMP+2 | used to store sign
- |
- .set EXC_SR,4 | exception frame status register
- .set EXC_PC,6 | exception frame program counter
- .set EXC_VEC,10 | exception frame vector (format+vector#)
- .set EXC_EA,12 | exception frame effective address
- |
- |--------------------------------------------------------------------------
- |
- | FPSR/FPCR bits
- |
- .set neg_bit,3 | negative result
- .set z_bit,2 | zero result
- .set inf_bit,1 | infinity result
- .set nan_bit,0 | not-a-number result
- |
- .set q_sn_bit,7 | sign bit of quotient byte
- |
- .set bsun_bit,7 | branch on unordered
- .set snan_bit,6 | signalling nan
- .set operr_bit,5 | operand error
- .set ovfl_bit,4 | overflow
- .set unfl_bit,3 | underflow
- .set dz_bit,2 | divide by zero
- .set inex2_bit,1 | inexact result 2
- .set inex1_bit,0 | inexact result 1
- |
- .set aiop_bit,7 | accrued illegal operation
- .set aovfl_bit,6 | accrued overflow
- .set aunfl_bit,5 | accrued underflow
- .set adz_bit,4 | accrued divide by zero
- .set ainex_bit,3 | accrued inexact
- |
- | FPSR individual bit masks
- |
- .set neg_mask,0x08000000
- .set z_mask,0x04000000
- .set inf_mask,0x02000000
- .set nan_mask,0x01000000
- |
- .set bsun_mask,0x00008000 |
- .set snan_mask,0x00004000
- .set operr_mask,0x00002000
- .set ovfl_mask,0x00001000
- .set unfl_mask,0x00000800
- .set dz_mask,0x00000400
- .set inex2_mask,0x00000200
- .set inex1_mask,0x00000100
- |
- .set aiop_mask,0x00000080 | accrued illegal operation
- .set aovfl_mask,0x00000040 | accrued overflow
- .set aunfl_mask,0x00000020 | accrued underflow
- .set adz_mask,0x00000010 | accrued divide by zero
- .set ainex_mask,0x00000008 | accrued inexact
- |
- | FPSR combinations used in the FPSP
- |
- .set dzinf_mask,inf_mask+dz_mask+adz_mask
- .set opnan_mask,nan_mask+operr_mask+aiop_mask
- .set nzi_mask,0x01ffffff | clears N, Z, and I
- .set unfinx_mask,unfl_mask+inex2_mask+aunfl_mask+ainex_mask
- .set unf2inx_mask,unfl_mask+inex2_mask+ainex_mask
- .set ovfinx_mask,ovfl_mask+inex2_mask+aovfl_mask+ainex_mask
- .set inx1a_mask,inex1_mask+ainex_mask
- .set inx2a_mask,inex2_mask+ainex_mask
- .set snaniop_mask,nan_mask+snan_mask+aiop_mask
- .set naniop_mask,nan_mask+aiop_mask
- .set neginf_mask,neg_mask+inf_mask
- .set infaiop_mask,inf_mask+aiop_mask
- .set negz_mask,neg_mask+z_mask
- .set opaop_mask,operr_mask+aiop_mask
- .set unfl_inx_mask,unfl_mask+aunfl_mask+ainex_mask
- .set ovfl_inx_mask,ovfl_mask+aovfl_mask+ainex_mask
- |
- |--------------------------------------------------------------------------
- |
- | FPCR rounding modes
- |
- .set x_mode,0x00 | round to extended
- .set s_mode,0x40 | round to single
- .set d_mode,0x80 | round to double
- |
- .set rn_mode,0x00 | round nearest
- .set rz_mode,0x10 | round to zero
- .set rm_mode,0x20 | round to minus infinity
- .set rp_mode,0x30 | round to plus infinity
- |
- |--------------------------------------------------------------------------
- |
- | Miscellaneous equates
- |
- .set signan_bit,6 | signalling nan bit in mantissa
- .set sign_bit,7
- |
- .set rnd_stky_bit,29 | round/sticky bit of mantissa
- | this can only be used if in a data register
- .set sx_mask,0x01800000 | set s and x bits in word $48
- |
- .set LOCAL_EX,0
- .set LOCAL_SGN,2
- .set LOCAL_HI,4
- .set LOCAL_LO,8
- .set LOCAL_GRS,12 | valid ONLY for FP_SCR1, FP_SCR2
- |
- |
- .set norm_tag,0x00 | tag bits in {7:5} position
- .set zero_tag,0x20
- .set inf_tag,0x40
- .set nan_tag,0x60
- .set dnrm_tag,0x80
- |
- | fsave sizes and formats
- |
- .set VER_4,0x40 | fpsp compatible version numbers
- | are in the $40s {$40-$4f}
- .set VER_40,0x40 | original version number
- .set VER_41,0x41 | revision version number
- |
- .set BUSY_SIZE,100 | size of busy frame
- .set BUSY_FRAME,LV-BUSY_SIZE | start of busy frame
- |
- .set UNIMP_40_SIZE,44 | size of orig unimp frame
- .set UNIMP_41_SIZE,52 | size of rev unimp frame
- |
- .set IDLE_SIZE,4 | size of idle frame
- .set IDLE_FRAME,LV-IDLE_SIZE | start of idle frame
- |
- | exception vectors
- |
- .set TRACE_VEC,0x2024 | trace trap
- .set FLINE_VEC,0x002C | real F-line
- .set UNIMP_VEC,0x202C | unimplemented
- .set INEX_VEC,0x00C4
- |
- .set dbl_thresh,0x3C01
- .set sgl_thresh,0x3F81
- |