third_party/android/patches/aarch64-libunwind.patch

--- libunwind/include/libunwind-aarch64.h	2015-08-03 19:24:10.000000000 +0300
+++ patches/libunwind-aarch64.h	2015-08-05 05:22:46.000000000 +0300
@@ -168,15 +168,37 @@
   }
 unw_tdep_save_loc_t;
 
-
 /* On AArch64, we can directly use ucontext_t as the unwind context.  */
 typedef ucontext_t unw_tdep_context_t;
 
 #include "libunwind-common.h"
 #include "libunwind-dynamic.h"
 
-#define unw_tdep_getcontext(uc)         (getcontext (uc), 0)
-#define unw_tdep_is_fpreg               UNW_ARCH_OBJ(is_fpreg)
+/* There is no getcontext in Android. */
+#define unw_tdep_getcontext(uc) (({                 \
+  unw_tdep_context_t *unw_ctx = (uc);                   \
+  register uint64_t *unw_base asm ("x0") = (uint64_t*) unw_ctx->uc_mcontext.regs;       \
+  __asm__ __volatile__ (                        \
+     "stp x0, x1, [%[base], #0]\n" \
+     "stp x2, x3, [%[base], #16]\n" \
+     "stp x4, x5, [%[base], #32]\n" \
+     "stp x6, x7, [%[base], #48]\n" \
+     "stp x8, x9, [%[base], #64]\n" \
+     "stp x10, x11, [%[base], #80]\n" \
+     "stp x12, x13, [%[base], #96]\n" \
+     "stp x14, x13, [%[base], #112]\n" \
+     "stp x16, x17, [%[base], #128]\n" \
+     "stp x18, x19, [%[base], #144]\n" \
+     "stp x20, x21, [%[base], #160]\n" \
+     "stp x22, x23, [%[base], #176]\n" \
+     "stp x24, x25, [%[base], #192]\n" \
+     "stp x26, x27, [%[base], #208]\n" \
+     "stp x28, x29, [%[base], #224]\n" \
+     "str x30, [%[base], #240]\n" \
+     "mov x1, sp\n" \
+     "stp x1, x30, [%[base], #248]\n" \
+     : [base] "+r" (unw_base) : : "x1", "memory"); \
+  }), 0)
 
 extern int unw_tdep_is_fpreg (int);