FIX: CodeView 4.0 Does Not Step Over Embedded Int 3

ID: Q87924

The information in this article applies to:

Microsoft CodeView for MS-DOS, versions 4.0, 4.01, 4.05
Microsoft CodeView for Windows, versions 4.0, 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 query words: 4.00 4.10

Keywords : kb16bitonly
Version : :4.0,4.01,4.05
Platform :
Issue type :