542e407581
The attached patch adds support for debugging 32-bit processes when running a 64-bit lldb on an x86_64 Linux system. Making this work required two basic changes: 1) Getting lldb to report that it could debug 32-bit processes 2) Changing an assumption about how ptrace works when debugging cross-platform For the first change, I took a conservative approach and only enabled this for x86_64 Linux platforms. It may be that the change I made in Host.cpp could be extended to other 64-bit Linux platforms, but I'm not familiar enough with the other platforms to know for sure. For the second change, the Linux ProcessMonitor class was assuming that ptrace(PTRACE_[PEEK|POKE]DATA...) would read/write a "word" based on the child process word size. However, the ptrace documentation says that the "word" size read or written is "determined by the OS variant." I verified experimentally that when ptracing a 32-bit child from a 64-bit parent a 64-bit word is read or written. llvm-svn: 163398 |
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