Exception Processing Reference
B.3 FLOATING-POINT STACK FRAMES
Figures B-16 through B-23 illustrate floating-point stack frames for the MC68881/MC68882 and the MC68040.
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31 |
23 |
15 |
7 |
0 |
+$00 |
$00 |
(UNDEFINED) |
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(RESERVED) |
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Figure B-16. MC68881/MC68882 and MC68040 Null Stack Frame
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31 |
23 |
15 |
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7 |
0 |
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+$00 |
VERSION NUMBER |
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+$18 |
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(RESERVED) |
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+$04 |
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COMMAND/CONDITION REGISTER |
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(RESERVED) |
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+$08 |
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EXCEPTIONAL OPERAND |
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+$0C |
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(12 BYTES) |
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+$10 |
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+$14 |
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OPERAND REGISTER |
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+$18 |
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BIU FLAGS |
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Figure B-17. MC68881 Idle Stack Frame
B-10 |
MC68000 FAMILY PROGRAMMER’S REFERENCE MANUAL |
MOTOROLA |
Exception Processing Reference
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31 |
23 |
15 |
7 |
0 |
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+$00 |
VERSION NUMBER |
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+$B4 |
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(RESERVED) |
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+$04 |
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+$08 |
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+$0C |
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INTERNAL REGISTERS |
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+$AC |
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(180 BYTES) |
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+$B0 +$B4
Figure B-18. MC68881 Busy Stack Frame
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31 |
23 |
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15 |
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7 |
0 |
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+$00 |
VERSION NUMBER |
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+$38 |
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(RESERVED) |
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+$04 |
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COMMAND/CONDITION REGISTER |
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(RESERVED) |
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+$08 |
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INTERNAL REGISTERS |
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(32 BYTES) |
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+$24 |
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+$28 |
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EXCEPTIONAL OPERAND |
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+$2C |
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(12 BYTES) |
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+$30 |
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+$34 |
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OPERAND REGISTER |
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+$38 |
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BIU FLAGS |
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Figure B-19. MC68882 Idle Stack Frame
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31 |
23 |
15 |
7 |
0 |
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+$00 |
VERSION NUMBER |
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+$D4 |
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(RESERVED) |
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+$04 |
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+$08 |
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+$0C |
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INTERNAL REGISTERS |
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+$CC |
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(212 BYTES) |
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+$D0 |
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+$D4 |
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Figure B-20. MC68882 Busy Stack Frame
B-11 |
MC68000 FAMILY PROGRAMMER’S REFERENCE MANUAL |
MOTOROLA |
