Operating behavior of breakpoints in shared ring 3 modules. In versions of SoftICE prior to 3.0, breakpoints set in shared ring3 modules would hit according to the description as defined in the Using SoftICE book, Chapter 7, "Understanding Breakpoint Contexts." In 3.0, we changed this so that breakpoints would only hit within the context in which the breakpoints were set. For Version 3.1, we have now added a SoftICE environment variable to toggle the behavior of shared ring3 breakpoints. By default, breakpoints only trigger in the context in which they were set. To change to the pre-3.0 behavior, from the SoftICE command line, issue the command set BreakInSharedMods on. Note that all breakpoints will have to be cleared with a bc * and then reset after changing this value. For shared ring 3 module breakpoints, it is possible for your application (or another application that is sharing the module) to end up crashing. This is due to copies of the physical pages that the code pages reside on being present and SoftICE not tracking these copies. Any such ring 3's left around in memory will cause crashes. There is currently no easy workaround. One possible solution would be to issue the set i3here on command to allow for user mode int3's to trigger SoftICE, and then modify the byte in memory, replacing it with the original code byte.
