diff options
Diffstat (limited to 'c/src/lib/libcpu/m68k/m68040/fpsp/bugfix.S')
| -rw-r--r-- | c/src/lib/libcpu/m68k/m68040/fpsp/bugfix.S | 497 |
1 files changed, 0 insertions, 497 deletions
diff --git a/c/src/lib/libcpu/m68k/m68040/fpsp/bugfix.S b/c/src/lib/libcpu/m68k/m68040/fpsp/bugfix.S deleted file mode 100644 index 9525f89369..0000000000 --- a/c/src/lib/libcpu/m68k/m68040/fpsp/bugfix.S +++ /dev/null @@ -1,497 +0,0 @@ -#include "fpsp-namespace.h" -// -// -// 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 -// -// THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA -// The copyright notice above does not evidence any -// actual or intended publication of such source code. - -//BUGFIX idnt 2,1 | Motorola 040 Floating Point Software Package - - |section 8 - -#include "fpsp.defs" - - |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 |