First cut of PowerPC(64) support in LLDB.

Summary:
This adds preliminary support for PowerPC/PowerPC64, for FreeBSD.  There are
some issues still:

 * Breakpoints don't work well on powerpc64.
 * Shared libraries don't yet get loaded for a 32-bit process on powerpc64 host.
 * Backtraces don't work.  This is due to PowerPC ABI using a backchain pointer
   in memory, instead of a dedicated frame pointer register for the backchain.
 * Breakpoints on functions without debug info may not work correctly for 32-bit
   powerpc.

Reviewers: emaste, tfiala, jingham, clayborg

Reviewed By: clayborg

Subscribers: emaste, lldb-commits

Differential Revision: http://reviews.llvm.org/D5988

llvm-svn: 220944

1 files changed, 2 insertions, 0 deletions

diff --git a/lldb/source/Plugins/Process/FreeBSD/ProcessMonitor.cpp b/lldb/source/Plugins/Process/FreeBSD/ProcessMonitor.cpp
index cb30a159fa1..bd96b6bfa45 100644
--- a/lldb/source/Plugins/Process/FreeBSD/ProcessMonitor.cpp
+++ b/lldb/source/Plugins/Process/FreeBSD/ProcessMonitor.cpp
@@ -113,6 +113,7 @@ PtraceWrapper(int req, lldb::pid_t pid, void *addr, int data,
             log->Printf("PT_GETREGS: ax=0x%lx", r->r_rax);
         }
 #endif
+#ifndef __powerpc__
         if (req == PT_GETDBREGS || req == PT_SETDBREGS) {
             struct dbreg *r = (struct dbreg *) addr;
             char setget = (req == PT_GETDBREGS) ? 'G' : 'S';
@@ -120,6 +121,7 @@ PtraceWrapper(int req, lldb::pid_t pid, void *addr, int data,
             for (int i = 0; i <= 7; i++)
                 log->Printf("PT_%cETDBREGS: dr[%d]=0x%lx", setget, i, r->dr[i]);
         }
+#endif
     }
      
     return result;