Merge "[ARM] Add unwind portable header adaptor."

Author: Andrew Hsieh

ndk/sources/android/libportable/Android.mk

@@ -71,7 +71,8 @@ libportable_arch_src_files += \
 			arch-arm/errno.c \
 			arch-arm/socket.c \
 			arch-arm/sockopt.c \
-			arch-arm/stat.c
+			arch-arm/stat.c \
+			arch-arm/unwind.c
 endif
 
 ifeq ($(TARGET_ARCH),x86)

ndk/sources/android/libportable/arch-arm/unwind.c

@@ -0,0 +1,79 @@
+/*
+ * Copyright 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdint.h>
+
+struct _Unwind_Context;
+
+typedef enum {
+  _UVRSC_CORE = 0,  // integer register
+  _UVRSC_VFP = 1, // vfp
+  _UVRSC_WMMXD = 3, // Intel WMMX data register
+  _UVRSC_WMMXC = 4  // Intel WMMX control register
+} _Unwind_VRS_RegClass;
+
+typedef enum {
+  _UVRSD_UINT32 = 0,
+  _UVRSD_VFPX = 1,
+  _UVRSD_UINT64 = 3,
+  _UVRSD_FLOAT = 4,
+  _UVRSD_DOUBLE = 5
+} _Unwind_VRS_DataRepresentation;
+
+typedef enum {
+  _UVRSR_OK = 0,
+  _UVRSR_NOT_IMPLEMENTED = 1,
+  _UVRSR_FAILED = 2
+} _Unwind_VRS_Result;
+
+_Unwind_VRS_Result _Unwind_VRS_Get(struct _Unwind_Context *context,
+                                   _Unwind_VRS_RegClass regclass,
+                                   uint32_t regno,
+                                   _Unwind_VRS_DataRepresentation representation,
+                                   void* valuep);
+
+_Unwind_VRS_Result _Unwind_VRS_Set(struct _Unwind_Context *context,
+                                   _Unwind_VRS_RegClass regclass,
+                                   uint32_t regno,
+                                   _Unwind_VRS_DataRepresentation representation,
+                                   void* valuep);
+
+#define UNWIND_POINTER_REG  12
+#define UNWIND_STACK_REG    13
+#define UNWIND_IP_REG       15
+
+uint64_t _Unwind_GetGR_portable(struct _Unwind_Context* ctx, int index) {
+  uint32_t val;
+  _Unwind_VRS_Get(ctx, _UVRSC_CORE, index, _UVRSD_UINT32, &val);
+  return (uint64_t)val;
+}
+
+void _Unwind_SetGR_portable(struct _Unwind_Context* ctx, int index, uint64_t new_value) {
+  uint32_t val = (uint32_t)new_value;
+  _Unwind_VRS_Set(ctx, _UVRSC_CORE, index, _UVRSD_UINT32, &val);
+}
+
+uint64_t _Unwind_GetIP_portable(struct _Unwind_Context* ctx) {
+  return _Unwind_GetGR_portable(ctx, UNWIND_IP_REG) & ~1; // thumb bit
+}
+
+void _Unwind_SetIP_portable(struct _Unwind_Context* ctx, uintptr_t new_value) {
+  uint32_t val = (uint32_t)new_value;
+  // Propagate thumb bit to instruction pointer
+  uint32_t thumbState = _Unwind_GetGR_portable(ctx, UNWIND_IP_REG) & 1;
+  uint64_t new_val = (uint64_t)(val | thumbState);
+  _Unwind_SetGR_portable(ctx, UNWIND_IP_REG, new_val);
+}