[libunwind] r248673 - unwind: Allow the building of libunwind for MIPS.

[Vasileios Kalintiris via cfe-commits]

Author: vkalintiris
Date: Sat Sep 26 13:26:01 2015
New Revision: 248673

URL: http://llvm.org/viewvc/llvm-project?rev=248673&view=rev
Log:
unwind: Allow the building of libunwind for MIPS.

Summary:
Currently, libunwind doesn't support MIPS. However, with this patch
we do allow the library to build, and we warn the user about the lack of
support for MIPS. Also, the dummy unw_getcontext() implementation for MIPS just
traps on function entry in order to avoid any confusion with silent/weird
failures at runtime.

This allows us to test an LLVM-based toolchain without the dependency on a
GCC toolchain. Of course, C++ exception handling and other things that depend
on stack unwinding will not work until we add a proper implementation of the
stub functions.

Reviewers: compnerd, logan

Subscribers: dsanders, llvm-commits

Differential Revision: http://reviews.llvm.org/D13160

Modified:
    libunwind/trunk/src/UnwindRegistersSave.S
    libunwind/trunk/src/config.h
    libunwind/trunk/src/libunwind.cpp

Modified: libunwind/trunk/src/UnwindRegistersSave.S
URL: http://llvm.org/viewvc/llvm-project/libunwind/trunk/src/UnwindRegistersSave.S?rev=248673&r1=248672&r2=248673&view=diff
==============================================================================
--- libunwind/trunk/src/UnwindRegistersSave.S (original)
+++ libunwind/trunk/src/UnwindRegistersSave.S Sat Sep 26 13:26:01 2015
@@ -87,6 +87,15 @@ DEFINE_LIBUNWIND_FUNCTION(unw_getcontext
   xorl  %eax, %eax    # return UNW_ESUCCESS
   ret
 
+# elif defined(__mips__)
+
+#
+# extern int unw_getcontext(unw_context_t* thread_state)
+#
+# Just trap for the time being.
+DEFINE_LIBUNWIND_FUNCTION(unw_getcontext)
+  teq $0, $0
+
 #elif defined(__ppc__)
 
 ;

Modified: libunwind/trunk/src/config.h
URL: http://llvm.org/viewvc/llvm-project/libunwind/trunk/src/config.h?rev=248673&r1=248672&r2=248673&view=diff
==============================================================================
--- libunwind/trunk/src/config.h (original)
+++ libunwind/trunk/src/config.h Sat Sep 26 13:26:01 2015
@@ -41,7 +41,8 @@
 
   #define _LIBUNWIND_BUILD_ZERO_COST_APIS (defined(__i386__) || \
                                            defined(__x86_64__) || \
-                                           defined(__arm64__))
+                                           defined(__arm64__) || \
+                                           defined(__mips__))
   #define _LIBUNWIND_BUILD_SJLJ_APIS      defined(__arm__)
   #define _LIBUNWIND_SUPPORT_FRAME_APIS   (defined(__i386__) || \
                                            defined(__x86_64__))

Modified: libunwind/trunk/src/libunwind.cpp
URL: http://llvm.org/viewvc/llvm-project/libunwind/trunk/src/libunwind.cpp?rev=248673&r1=248672&r2=248673&view=diff
==============================================================================
--- libunwind/trunk/src/libunwind.cpp (original)
+++ libunwind/trunk/src/libunwind.cpp Sat Sep 26 13:26:01 2015
@@ -64,6 +64,8 @@ _LIBUNWIND_EXPORT int unw_init_local(unw
 #elif defined(__or1k__)
   new ((void *)cursor) UnwindCursor<LocalAddressSpace, Registers_or1k>(
                                  context, LocalAddressSpace::sThisAddressSpace);
+#elif defined(__mips__)
+#warning The MIPS architecture is not supported.
 #else
 #error Architecture not supported
 #endif