FIX: CodeView 4.0 Does Not Step Over Embedded Int 3

 Last reviewed: September 16, 1997
Article ID: Q87924
4.00 4.01 4.05 | 4.00 4.01 
MS-DOS         | WINDOWS
kbtool kbbuglist kbfixlist

The information in this article applies to:

  • Microsoft CodeView for MS-DOS, versions 4.0, 4.01, and 4.05
  • Microsoft CodeView for Windows, versions 4.0 and 4.01

SYMPTOMS

Microsoft CodeView version 4.0 will not step over an embedded Interrupt 3 instruction. Execution will also stop after pressing F5 for Go, and will not pass this instruction.

RESOLUTION

You can either step over the Int 3 by changing the value of the IP register, or use the Assemble command to change the Int 3 instruction.

You can modify the IP register so it points to the instruction immediately after the Int 3 by modifying the register directly in the register window, or by using the Rip command.

You can change the Int 3 to a NOP instruction using the Assemble (a) command as follows 

   >a XXXX:XXX1
   >XXXX:XXX1 nop
   >XXXX:XXX2
where XXXX:XXX1 is the address where the Int 3 is located.

STATUS

Microsoft has confirmed this to be a problem in CodeView versions 4.0, 4.01, and 4.05. This problem was corrected in CodeView version 4.1.

MORE INFORMATION

Int 3 is a special debugging interrupt. It is often put in code to create a permanent, or hard breakpoint.

Additional reference words: 4.00 4.10
KBCategory: kbtool kbbuglist kbfixlist
KBSubcategory: CvwIss
Keywords : kb16bitonly
Solution Type : kbfix

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Last reviewed: September 16, 1997
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