1 /* 2 * Copyright 2013, The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <portability.h> 18 #include <stdint.h> 19 20 struct _Unwind_Context; 21 22 typedef enum { 23 _UVRSC_CORE = 0, // integer register 24 _UVRSC_VFP = 1, // vfp 25 _UVRSC_WMMXD = 3, // Intel WMMX data register 26 _UVRSC_WMMXC = 4 // Intel WMMX control register 27 } _Unwind_VRS_RegClass; 28 29 typedef enum { 30 _UVRSD_UINT32 = 0, 31 _UVRSD_VFPX = 1, 32 _UVRSD_UINT64 = 3, 33 _UVRSD_FLOAT = 4, 34 _UVRSD_DOUBLE = 5 35 } _Unwind_VRS_DataRepresentation; 36 37 typedef enum { 38 _UVRSR_OK = 0, 39 _UVRSR_NOT_IMPLEMENTED = 1, 40 _UVRSR_FAILED = 2 41 } _Unwind_VRS_Result; 42 43 _Unwind_VRS_Result _Unwind_VRS_Get(struct _Unwind_Context *context, 44 _Unwind_VRS_RegClass regclass, 45 uint32_t regno, 46 _Unwind_VRS_DataRepresentation representation, 47 void* valuep); 48 49 _Unwind_VRS_Result _Unwind_VRS_Set(struct _Unwind_Context *context, 50 _Unwind_VRS_RegClass regclass, 51 uint32_t regno, 52 _Unwind_VRS_DataRepresentation representation, 53 void* valuep); 54 55 #define UNWIND_POINTER_REG 12 56 #define UNWIND_STACK_REG 13 57 #define UNWIND_IP_REG 15 58 59 uint64_t WRAP(_Unwind_GetGR)(struct _Unwind_Context* ctx, int index) { 60 uint32_t val; 61 _Unwind_VRS_Get(ctx, _UVRSC_CORE, index, _UVRSD_UINT32, &val); 62 return (uint64_t)val; 63 } 64 65 void WRAP(_Unwind_SetGR)(struct _Unwind_Context* ctx, int index, uint64_t new_value) { 66 uint32_t val = (uint32_t)new_value; 67 _Unwind_VRS_Set(ctx, _UVRSC_CORE, index, _UVRSD_UINT32, &val); 68 } 69 70 uint64_t WRAP(_Unwind_GetIP)(struct _Unwind_Context* ctx) { 71 return WRAP(_Unwind_GetGR)(ctx, UNWIND_IP_REG) & ~1; // thumb bit 72 } 73 74 void WRAP(_Unwind_SetIP)(struct _Unwind_Context* ctx, uintptr_t new_value) { 75 uint32_t val = (uint32_t)new_value; 76 // Propagate thumb bit to instruction pointer 77 uint32_t thumbState = WRAP(_Unwind_GetGR)(ctx, UNWIND_IP_REG) & 1; 78 uint64_t new_val = (uint64_t)(val | thumbState); 79 WRAP(_Unwind_SetGR)(ctx, UNWIND_IP_REG, new_val); 80 } 81
