diff options
Diffstat (limited to '')
| -rw-r--r-- | arch/m68k/fpsp040/fpsp.h | 347 |
1 files changed, 347 insertions, 0 deletions
diff --git a/arch/m68k/fpsp040/fpsp.h b/arch/m68k/fpsp040/fpsp.h new file mode 100644 index 000000000..5df4cd772 --- /dev/null +++ b/arch/m68k/fpsp040/fpsp.h @@ -0,0 +1,347 @@ +| +| fpsp.h 3.3 3.3 +| + +| 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. + +| 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 +| |