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f00fbug.txt

Associated article: The Pentium F00F Bug

Tags: Embedded Systems    

Published source code accompanying the article by Robert R. Collins in which he describes the x86 "F00F" bug. When any x86 processor encounters an invalid instruction, the processor is supposed to generate an invalid opcode exception. If this mechanism fails, however, the errant program can bring down the system--and that's just what happens when the Pentium encounters the "F00F" bug. Also see F00FBUG.ZIP.

					The Pentium F00F Bug

by Robert R. Collins



Example 1: 



Sequence  Address   Data      Mnemonic                             Timestamp

-----------------------------------------------------------------------------

T 524285  000000B2----7E--------(-IO-WRITE-)--------------------------300 ns

  524286  00000018  ----E14C    ( LOCKED MEM READ )                   440 ns

  524287  0000001A  F000----    ( LOCKED MEM READ )                   100 ns

_____________________________________________________________________________





Example 2: 



Sequence  Address   Data      ...							
										
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