booloo@lll-crg.llnl.gov (Mark Boolootian) (02/28/91)
Can anyone tell me how dbx comes up with addresses to hand to ptrace()? For example, when breakpointing at a given line number in a C program, how does dbx calculate the address of the first instruction for that line (which is what I am assuming is handed to ptrace()). And, while I'm at it, am I correct to assume that dbx stuffs some illegal instruction in place of the instruction at the breakpoint location, replacing it with the original instruction when a "continue" is issued to the debugger? I'm asking about dbx on a BSD-derived system. Is dbx on SYSV different? I know that SYSV has the /proc directory (used for reading/writing a process as I understand it). Does this correspond to the core image that ptrace() on BSD systems work with? Thanks in advance for any info. I can take replies via email and summarize (and will do so unless reponses are posted). cheers, mb booloo@lll-crg.llnl.gov