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
WRAP(_Unwind_GetGR)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
WRAP(_Unwind_SetGR)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
WRAP(_Unwind_GetIP)70 uint64_t WRAP(_Unwind_GetIP)(struct _Unwind_Context* ctx) {
71 return WRAP(_Unwind_GetGR)(ctx, UNWIND_IP_REG) & ~1; // thumb bit
72 }
73
WRAP(_Unwind_SetIP)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