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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/m68k/fpsp040/x_unimp.S | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | arch/m68k/fpsp040/x_unimp.S | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/arch/m68k/fpsp040/x_unimp.S b/arch/m68k/fpsp040/x_unimp.S new file mode 100644 index 000000000..6f382b212 --- /dev/null +++ b/arch/m68k/fpsp040/x_unimp.S @@ -0,0 +1,76 @@ +| +| x_unimp.sa 3.3 7/1/91 +| +| fpsp_unimp --- FPSP handler for unimplemented instruction +| exception. +| +| Invoked when the user program encounters a floating-point +| op-code that hardware does not support. Trap vector# 11 +| (See table 8-1 MC68030 User's Manual). +| +| +| Note: An fsave for an unimplemented inst. will create a short +| fsave stack. +| +| Input: 1. Six word stack frame for unimplemented inst, four word +| for illegal +| (See table 8-7 MC68030 User's Manual). +| 2. Unimp (short) fsave state frame created here by fsave +| instruction. +| +| +| 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. + +X_UNIMP: |idnt 2,1 | Motorola 040 Floating Point Software Package + + |section 8 + +#include "fpsp.h" + + |xref get_op + |xref do_func + |xref sto_res + |xref gen_except + |xref fpsp_fmt_error + + .global fpsp_unimp + .global uni_2 +fpsp_unimp: + link %a6,#-LOCAL_SIZE + fsave -(%a7) +uni_2: + moveml %d0-%d1/%a0-%a1,USER_DA(%a6) + fmovemx %fp0-%fp3,USER_FP0(%a6) + fmoveml %fpcr/%fpsr/%fpiar,USER_FPCR(%a6) + moveb (%a7),%d0 |test for valid version num + andib #0xf0,%d0 |test for $4x + cmpib #VER_4,%d0 |must be $4x or exit + bnel fpsp_fmt_error +| +| Temporary D25B Fix +| The following lines are used to ensure that the FPSR +| exception byte and condition codes are clear before proceeding +| + movel USER_FPSR(%a6),%d0 + andl #0xFF00FF,%d0 |clear all but accrued exceptions + movel %d0,USER_FPSR(%a6) + fmovel #0,%FPSR |clear all user bits + fmovel #0,%FPCR |clear all user exceptions for FPSP + + clrb UFLG_TMP(%a6) |clr flag for unsupp data + + bsrl get_op |go get operand(s) + clrb STORE_FLG(%a6) + bsrl do_func |do the function + fsave -(%a7) |capture possible exc state + tstb STORE_FLG(%a6) + bnes no_store |if STORE_FLG is set, no store + bsrl sto_res |store the result in user space +no_store: + bral gen_except |post any exceptions and return + + |end |