[PPC64] Port to ppc64le - initial version

Initial working version of libunwind for PowerPC 64. Tested on
little-endian ppc64 host only.
Based on the existing PowerPC 32 code.

It supports:

- context save/restore (unw_getcontext, unw_init_local, unw_resume)
- read/write from/to saved registers
- backtrace (unw_step)

Patch by Leandro Lupori!

Differential Revision: https://reviews.llvm.org/D41386

llvm-svn: 321667

1 files changed, 7 insertions, 0 deletions

diff --git a/libunwind/src/AddressSpace.hpp b/libunwind/src/AddressSpace.hpp
index 24914fa329a..384fc9a32da 100644
--- a/libunwind/src/AddressSpace.hpp
+++ b/libunwind/src/AddressSpace.hpp
@@ -697,6 +697,13 @@ struct unw_addr_space_ppc : public unw_addr_space {
   RemoteAddressSpace<Pointer32<BigEndian>> oas;
 };
 
+/// unw_addr_space_ppc is the concrete instance that a unw_addr_space_t points
+/// to when examining a 64-bit PowerPC process.
+struct unw_addr_space_ppc64 : public unw_addr_space {
+  unw_addr_space_ppc64(task_t task) : oas(task) {}
+  RemoteAddressSpace<Pointer64<LittleEndian>> oas;
+};
+
 #endif // UNW_REMOTE
 
 } // namespace libunwind