diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/m68k/fpsp040/bugfix.S')
| -rw-r--r-- | ANDROID_3.4.5/arch/m68k/fpsp040/bugfix.S | 495 |
1 files changed, 0 insertions, 495 deletions
diff --git a/ANDROID_3.4.5/arch/m68k/fpsp040/bugfix.S b/ANDROID_3.4.5/arch/m68k/fpsp040/bugfix.S deleted file mode 100644 index 3bb9c84b..00000000 --- a/ANDROID_3.4.5/arch/m68k/fpsp040/bugfix.S +++ /dev/null @@ -1,495 +0,0 @@ -| -| bugfix.sa 3.2 1/31/91 -| -| -| This file contains workarounds for bugs in the 040 -| relating to the Floating-Point Software Package (FPSP) -| -| Fixes for bugs: 1238 -| -| Bug: 1238 -| -| -| /* The following dirty_bit clear should be left in -| * the handler permanently to improve throughput. -| * The dirty_bits are located at bits [23:16] in -| * longword $08 in the busy frame $4x60. Bit 16 -| * corresponds to FP0, bit 17 corresponds to FP1, -| * and so on. -| */ -| if (E3_exception_just_serviced) { -| dirty_bit[cmdreg3b[9:7]] = 0; -| } -| -| if (fsave_format_version != $40) {goto NOFIX} -| -| if !(E3_exception_just_serviced) {goto NOFIX} -| if (cupc == 0000000) {goto NOFIX} -| if ((cmdreg1b[15:13] != 000) && -| (cmdreg1b[15:10] != 010001)) {goto NOFIX} -| if (((cmdreg1b[15:13] != 000) || ((cmdreg1b[12:10] != cmdreg2b[9:7]) && -| (cmdreg1b[12:10] != cmdreg3b[9:7])) ) && -| ((cmdreg1b[ 9: 7] != cmdreg2b[9:7]) && -| (cmdreg1b[ 9: 7] != cmdreg3b[9:7])) ) {goto NOFIX} -| -| /* Note: for 6d43b or 8d43b, you may want to add the following code -| * to get better coverage. (If you do not insert this code, the part -| * won't lock up; it will simply get the wrong answer.) -| * Do NOT insert this code for 10d43b or later parts. -| * -| * if (fpiarcu == integer stack return address) { -| * cupc = 0000000; -| * goto NOFIX; -| * } -| */ -| -| if (cmdreg1b[15:13] != 000) {goto FIX_OPCLASS2} -| FIX_OPCLASS0: -| if (((cmdreg1b[12:10] == cmdreg2b[9:7]) || -| (cmdreg1b[ 9: 7] == cmdreg2b[9:7])) && -| (cmdreg1b[12:10] != cmdreg3b[9:7]) && -| (cmdreg1b[ 9: 7] != cmdreg3b[9:7])) { /* xu conflict only */ -| /* We execute the following code if there is an -| xu conflict and NOT an nu conflict */ -| -| /* first save some values on the fsave frame */ -| stag_temp = STAG[fsave_frame]; -| cmdreg1b_temp = CMDREG1B[fsave_frame]; -| dtag_temp = DTAG[fsave_frame]; -| ete15_temp = ETE15[fsave_frame]; -| -| CUPC[fsave_frame] = 0000000; -| FRESTORE -| FSAVE -| -| /* If the xu instruction is exceptional, we punt. -| * Otherwise, we would have to include OVFL/UNFL handler -| * code here to get the correct answer. -| */ -| if (fsave_frame_format == $4060) {goto KILL_PROCESS} -| -| fsave_frame = /* build a long frame of all zeros */ -| fsave_frame_format = $4060; /* label it as long frame */ -| -| /* load it with the temps we saved */ -| STAG[fsave_frame] = stag_temp; -| CMDREG1B[fsave_frame] = cmdreg1b_temp; -| DTAG[fsave_frame] = dtag_temp; -| ETE15[fsave_frame] = ete15_temp; -| -| /* Make sure that the cmdreg3b dest reg is not going to -| * be destroyed by a FMOVEM at the end of all this code. -| * If it is, you should move the current value of the reg -| * onto the stack so that the reg will loaded with that value. -| */ -| -| /* All done. Proceed with the code below */ -| } -| -| etemp = FP_reg_[cmdreg1b[12:10]]; -| ete15 = ~ete14; -| cmdreg1b[15:10] = 010010; -| clear(bug_flag_procIDxxxx); -| FRESTORE and return; -| -| -| FIX_OPCLASS2: -| if ((cmdreg1b[9:7] == cmdreg2b[9:7]) && -| (cmdreg1b[9:7] != cmdreg3b[9:7])) { /* xu conflict only */ -| /* We execute the following code if there is an -| xu conflict and NOT an nu conflict */ -| -| /* first save some values on the fsave frame */ -| stag_temp = STAG[fsave_frame]; -| cmdreg1b_temp = CMDREG1B[fsave_frame]; -| dtag_temp = DTAG[fsave_frame]; -| ete15_temp = ETE15[fsave_frame]; -| etemp_temp = ETEMP[fsave_frame]; -| -| CUPC[fsave_frame] = 0000000; -| FRESTORE -| FSAVE -| -| -| /* If the xu instruction is exceptional, we punt. -| * Otherwise, we would have to include OVFL/UNFL handler -| * code here to get the correct answer. -| */ -| if (fsave_frame_format == $4060) {goto KILL_PROCESS} -| -| fsave_frame = /* build a long frame of all zeros */ -| fsave_frame_format = $4060; /* label it as long frame */ -| -| /* load it with the temps we saved */ -| STAG[fsave_frame] = stag_temp; -| CMDREG1B[fsave_frame] = cmdreg1b_temp; -| DTAG[fsave_frame] = dtag_temp; -| ETE15[fsave_frame] = ete15_temp; -| ETEMP[fsave_frame] = etemp_temp; -| -| /* Make sure that the cmdreg3b dest reg is not going to -| * be destroyed by a FMOVEM at the end of all this code. -| * If it is, you should move the current value of the reg -| * onto the stack so that the reg will loaded with that value. -| */ -| -| /* All done. Proceed with the code below */ -| } -| -| if (etemp_exponent == min_sgl) etemp_exponent = min_dbl; -| if (etemp_exponent == max_sgl) etemp_exponent = max_dbl; -| cmdreg1b[15:10] = 010101; -| clear(bug_flag_procIDxxxx); -| FRESTORE and return; -| -| -| NOFIX: -| clear(bug_flag_procIDxxxx); -| FRESTORE and return; -| - - -| 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. - -|BUGFIX idnt 2,1 | Motorola 040 Floating Point Software Package - - |section 8 - -#include "fpsp.h" - - |xref fpsp_fmt_error - - .global b1238_fix -b1238_fix: -| -| This code is entered only on completion of the handling of an -| nu-generated ovfl, unfl, or inex exception. If the version -| number of the fsave is not $40, this handler is not necessary. -| Simply branch to fix_done and exit normally. -| - cmpib #VER_40,4(%a7) - bne fix_done -| -| Test for cu_savepc equal to zero. If not, this is not a bug -| #1238 case. -| - moveb CU_SAVEPC(%a6),%d0 - andib #0xFE,%d0 - beq fix_done |if zero, this is not bug #1238 - -| -| Test the register conflict aspect. If opclass0, check for -| cu src equal to xu dest or equal to nu dest. If so, go to -| op0. Else, or if opclass2, check for cu dest equal to -| xu dest or equal to nu dest. If so, go to tst_opcl. Else, -| exit, it is not the bug case. -| -| Check for opclass 0. If not, go and check for opclass 2 and sgl. -| - movew CMDREG1B(%a6),%d0 - andiw #0xE000,%d0 |strip all but opclass - bne op2sgl |not opclass 0, check op2 -| -| Check for cu and nu register conflict. If one exists, this takes -| priority over a cu and xu conflict. -| - bfextu CMDREG1B(%a6){#3:#3},%d0 |get 1st src - bfextu CMDREG3B(%a6){#6:#3},%d1 |get 3rd dest - cmpb %d0,%d1 - beqs op0 |if equal, continue bugfix -| -| Check for cu dest equal to nu dest. If so, go and fix the -| bug condition. Otherwise, exit. -| - bfextu CMDREG1B(%a6){#6:#3},%d0 |get 1st dest - cmpb %d0,%d1 |cmp 1st dest with 3rd dest - beqs op0 |if equal, continue bugfix -| -| Check for cu and xu register conflict. -| - bfextu CMDREG2B(%a6){#6:#3},%d1 |get 2nd dest - cmpb %d0,%d1 |cmp 1st dest with 2nd dest - beqs op0_xu |if equal, continue bugfix - bfextu CMDREG1B(%a6){#3:#3},%d0 |get 1st src - cmpb %d0,%d1 |cmp 1st src with 2nd dest - beq op0_xu - bne fix_done |if the reg checks fail, exit -| -| We have the opclass 0 situation. -| -op0: - bfextu CMDREG1B(%a6){#3:#3},%d0 |get source register no - movel #7,%d1 - subl %d0,%d1 - clrl %d0 - bsetl %d1,%d0 - fmovemx %d0,ETEMP(%a6) |load source to ETEMP - - moveb #0x12,%d0 - bfins %d0,CMDREG1B(%a6){#0:#6} |opclass 2, extended -| -| Set ETEMP exponent bit 15 as the opposite of ete14 -| - btst #6,ETEMP_EX(%a6) |check etemp exponent bit 14 - beq setete15 - bclr #etemp15_bit,STAG(%a6) - bra finish -setete15: - bset #etemp15_bit,STAG(%a6) - bra finish - -| -| We have the case in which a conflict exists between the cu src or -| dest and the dest of the xu. We must clear the instruction in -| the cu and restore the state, allowing the instruction in the -| xu to complete. Remember, the instruction in the nu -| was exceptional, and was completed by the appropriate handler. -| If the result of the xu instruction is not exceptional, we can -| restore the instruction from the cu to the frame and continue -| processing the original exception. If the result is also -| exceptional, we choose to kill the process. -| -| Items saved from the stack: -| -| $3c stag - L_SCR1 -| $40 cmdreg1b - L_SCR2 -| $44 dtag - L_SCR3 -| -| The cu savepc is set to zero, and the frame is restored to the -| fpu. -| -op0_xu: - movel STAG(%a6),L_SCR1(%a6) - movel CMDREG1B(%a6),L_SCR2(%a6) - movel DTAG(%a6),L_SCR3(%a6) - andil #0xe0000000,L_SCR3(%a6) - moveb #0,CU_SAVEPC(%a6) - movel (%a7)+,%d1 |save return address from bsr - frestore (%a7)+ - fsave -(%a7) -| -| Check if the instruction which just completed was exceptional. -| - cmpw #0x4060,(%a7) - beq op0_xb -| -| It is necessary to isolate the result of the instruction in the -| xu if it is to fp0 - fp3 and write that value to the USER_FPn -| locations on the stack. The correct destination register is in -| cmdreg2b. -| - bfextu CMDREG2B(%a6){#6:#3},%d0 |get dest register no - cmpil #3,%d0 - bgts op0_xi - beqs op0_fp3 - cmpil #1,%d0 - blts op0_fp0 - beqs op0_fp1 -op0_fp2: - fmovemx %fp2-%fp2,USER_FP2(%a6) - bras op0_xi -op0_fp1: - fmovemx %fp1-%fp1,USER_FP1(%a6) - bras op0_xi -op0_fp0: - fmovemx %fp0-%fp0,USER_FP0(%a6) - bras op0_xi -op0_fp3: - fmovemx %fp3-%fp3,USER_FP3(%a6) -| -| The frame returned is idle. We must build a busy frame to hold -| the cu state information and setup etemp. -| -op0_xi: - movel #22,%d0 |clear 23 lwords - clrl (%a7) -op0_loop: - clrl -(%a7) - dbf %d0,op0_loop - movel #0x40600000,-(%a7) - movel L_SCR1(%a6),STAG(%a6) - movel L_SCR2(%a6),CMDREG1B(%a6) - movel L_SCR3(%a6),DTAG(%a6) - moveb #0x6,CU_SAVEPC(%a6) - movel %d1,-(%a7) |return bsr return address - bfextu CMDREG1B(%a6){#3:#3},%d0 |get source register no - movel #7,%d1 - subl %d0,%d1 - clrl %d0 - bsetl %d1,%d0 - fmovemx %d0,ETEMP(%a6) |load source to ETEMP - - moveb #0x12,%d0 - bfins %d0,CMDREG1B(%a6){#0:#6} |opclass 2, extended -| -| Set ETEMP exponent bit 15 as the opposite of ete14 -| - btst #6,ETEMP_EX(%a6) |check etemp exponent bit 14 - beq op0_sete15 - bclr #etemp15_bit,STAG(%a6) - bra finish -op0_sete15: - bset #etemp15_bit,STAG(%a6) - bra finish - -| -| The frame returned is busy. It is not possible to reconstruct -| the code sequence to allow completion. We will jump to -| fpsp_fmt_error and allow the kernel to kill the process. -| -op0_xb: - jmp fpsp_fmt_error - -| -| Check for opclass 2 and single size. If not both, exit. -| -op2sgl: - movew CMDREG1B(%a6),%d0 - andiw #0xFC00,%d0 |strip all but opclass and size - cmpiw #0x4400,%d0 |test for opclass 2 and size=sgl - bne fix_done |if not, it is not bug 1238 -| -| Check for cu dest equal to nu dest or equal to xu dest, with -| a cu and nu conflict taking priority an nu conflict. If either, -| go and fix the bug condition. Otherwise, exit. -| - bfextu CMDREG1B(%a6){#6:#3},%d0 |get 1st dest - bfextu CMDREG3B(%a6){#6:#3},%d1 |get 3rd dest - cmpb %d0,%d1 |cmp 1st dest with 3rd dest - beq op2_com |if equal, continue bugfix - bfextu CMDREG2B(%a6){#6:#3},%d1 |get 2nd dest - cmpb %d0,%d1 |cmp 1st dest with 2nd dest - bne fix_done |if the reg checks fail, exit -| -| We have the case in which a conflict exists between the cu src or -| dest and the dest of the xu. We must clear the instruction in -| the cu and restore the state, allowing the instruction in the -| xu to complete. Remember, the instruction in the nu -| was exceptional, and was completed by the appropriate handler. -| If the result of the xu instruction is not exceptional, we can -| restore the instruction from the cu to the frame and continue -| processing the original exception. If the result is also -| exceptional, we choose to kill the process. -| -| Items saved from the stack: -| -| $3c stag - L_SCR1 -| $40 cmdreg1b - L_SCR2 -| $44 dtag - L_SCR3 -| etemp - FP_SCR2 -| -| The cu savepc is set to zero, and the frame is restored to the -| fpu. -| -op2_xu: - movel STAG(%a6),L_SCR1(%a6) - movel CMDREG1B(%a6),L_SCR2(%a6) - movel DTAG(%a6),L_SCR3(%a6) - andil #0xe0000000,L_SCR3(%a6) - moveb #0,CU_SAVEPC(%a6) - movel ETEMP(%a6),FP_SCR2(%a6) - movel ETEMP_HI(%a6),FP_SCR2+4(%a6) - movel ETEMP_LO(%a6),FP_SCR2+8(%a6) - movel (%a7)+,%d1 |save return address from bsr - frestore (%a7)+ - fsave -(%a7) -| -| Check if the instruction which just completed was exceptional. -| - cmpw #0x4060,(%a7) - beq op2_xb -| -| It is necessary to isolate the result of the instruction in the -| xu if it is to fp0 - fp3 and write that value to the USER_FPn -| locations on the stack. The correct destination register is in -| cmdreg2b. -| - bfextu CMDREG2B(%a6){#6:#3},%d0 |get dest register no - cmpil #3,%d0 - bgts op2_xi - beqs op2_fp3 - cmpil #1,%d0 - blts op2_fp0 - beqs op2_fp1 -op2_fp2: - fmovemx %fp2-%fp2,USER_FP2(%a6) - bras op2_xi -op2_fp1: - fmovemx %fp1-%fp1,USER_FP1(%a6) - bras op2_xi -op2_fp0: - fmovemx %fp0-%fp0,USER_FP0(%a6) - bras op2_xi -op2_fp3: - fmovemx %fp3-%fp3,USER_FP3(%a6) -| -| The frame returned is idle. We must build a busy frame to hold -| the cu state information and fix up etemp. -| -op2_xi: - movel #22,%d0 |clear 23 lwords - clrl (%a7) -op2_loop: - clrl -(%a7) - dbf %d0,op2_loop - movel #0x40600000,-(%a7) - movel L_SCR1(%a6),STAG(%a6) - movel L_SCR2(%a6),CMDREG1B(%a6) - movel L_SCR3(%a6),DTAG(%a6) - moveb #0x6,CU_SAVEPC(%a6) - movel FP_SCR2(%a6),ETEMP(%a6) - movel FP_SCR2+4(%a6),ETEMP_HI(%a6) - movel FP_SCR2+8(%a6),ETEMP_LO(%a6) - movel %d1,-(%a7) - bra op2_com - -| -| We have the opclass 2 single source situation. -| -op2_com: - moveb #0x15,%d0 - bfins %d0,CMDREG1B(%a6){#0:#6} |opclass 2, double - - cmpw #0x407F,ETEMP_EX(%a6) |single +max - bnes case2 - movew #0x43FF,ETEMP_EX(%a6) |to double +max - bra finish -case2: - cmpw #0xC07F,ETEMP_EX(%a6) |single -max - bnes case3 - movew #0xC3FF,ETEMP_EX(%a6) |to double -max - bra finish -case3: - cmpw #0x3F80,ETEMP_EX(%a6) |single +min - bnes case4 - movew #0x3C00,ETEMP_EX(%a6) |to double +min - bra finish -case4: - cmpw #0xBF80,ETEMP_EX(%a6) |single -min - bne fix_done - movew #0xBC00,ETEMP_EX(%a6) |to double -min - bra finish -| -| The frame returned is busy. It is not possible to reconstruct -| the code sequence to allow completion. fpsp_fmt_error causes -| an fline illegal instruction to be executed. -| -| You should replace the jump to fpsp_fmt_error with a jump -| to the entry point used to kill a process. -| -op2_xb: - jmp fpsp_fmt_error - -| -| Enter here if the case is not of the situations affected by -| bug #1238, or if the fix is completed, and exit. -| -finish: -fix_done: - rts - - |end |