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, 22 insertions, 0 deletions

diff --git a/lldb/source/Plugins/Process/POSIX/POSIXThread.cpp b/lldb/source/Plugins/Process/POSIX/POSIXThread.cpp
index 64c9de90800..1057585e1b2 100644
--- a/lldb/source/Plugins/Process/POSIX/POSIXThread.cpp
+++ b/lldb/source/Plugins/Process/POSIX/POSIXThread.cpp
@@ -34,12 +34,14 @@
 #include "Plugins/Process/Linux/ProcessMonitor.h"
 #include "RegisterContextPOSIXProcessMonitor_arm64.h"
 #include "RegisterContextPOSIXProcessMonitor_mips64.h"
+#include "RegisterContextPOSIXProcessMonitor_powerpc.h"
 #include "RegisterContextPOSIXProcessMonitor_x86.h"
 #include "Plugins/Process/Utility/RegisterContextLinux_arm64.h"
 #include "Plugins/Process/Utility/RegisterContextLinux_i386.h"
 #include "Plugins/Process/Utility/RegisterContextLinux_x86_64.h"
 #include "Plugins/Process/Utility/RegisterContextFreeBSD_i386.h"
 #include "Plugins/Process/Utility/RegisterContextFreeBSD_mips64.h"
+#include "Plugins/Process/Utility/RegisterContextFreeBSD_powerpc.h"
 #include "Plugins/Process/Utility/RegisterContextFreeBSD_x86_64.h"
 #include "Plugins/Process/Utility/UnwindLLDB.h"
 
@@ -167,6 +169,14 @@ POSIXThread::GetRegisterContext()
             case llvm::Triple::FreeBSD:
                 switch (target_arch.GetMachine())
                 {
+                    case llvm::Triple::ppc:
+#ifndef __powerpc64__
+                        reg_interface = new RegisterContextFreeBSD_powerpc32(target_arch);
+                        break;
+#endif
+                    case llvm::Triple::ppc64:
+                        reg_interface = new RegisterContextFreeBSD_powerpc64(target_arch);
+                        break;
                     case llvm::Triple::mips64:
                         reg_interface = new RegisterContextFreeBSD_mips64(target_arch);
                         break;
@@ -229,6 +239,14 @@ POSIXThread::GetRegisterContext()
                     m_reg_context_sp.reset(reg_ctx);
                     break;
                 }
+            case llvm::Triple::ppc:
+            case llvm::Triple::ppc64:
+                {
+                    RegisterContextPOSIXProcessMonitor_powerpc *reg_ctx = new RegisterContextPOSIXProcessMonitor_powerpc(*this, 0, reg_interface);
+                    m_posix_thread = reg_ctx;
+                    m_reg_context_sp.reset(reg_ctx);
+                    break;
+                }
             case llvm::Triple::x86:
             case llvm::Triple::x86_64:
                 {
@@ -624,6 +642,8 @@ POSIXThread::GetRegisterIndexFromOffset(unsigned offset)
 
     case llvm::Triple::aarch64:
     case llvm::Triple::mips64:
+    case llvm::Triple::ppc:
+    case llvm::Triple::ppc64:
     case llvm::Triple::x86:
     case llvm::Triple::x86_64:
         {
@@ -655,6 +675,8 @@ POSIXThread::GetRegisterName(unsigned reg)
 
     case llvm::Triple::aarch64:
     case llvm::Triple::mips64:
+    case llvm::Triple::ppc:
+    case llvm::Triple::ppc64:
     case llvm::Triple::x86:
     case llvm::Triple::x86_64:
         name = GetRegisterContext()->GetRegisterName(reg);