6433ec22b1
Linker --wrap option resolves to __wrap_symbol for undefined symbol. During the compilation of host libportable.a, __HOST__ is defined to rename all portable functions to __wrap_symbol, and the real function to __real_symbol. This way libportable.a can be validated at host w/o changes of user's source code. See http://sourceware.org/binutils/docs/ld/Options.html Change-Id: Idcbe53dd642536f3dc2be85a875f95535b9dc0b1
81 lines
2.7 KiB
C
81 lines
2.7 KiB
C
/*
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* Copyright 2013, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <portability.h>
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#include <stdint.h>
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struct _Unwind_Context;
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typedef enum {
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_UVRSC_CORE = 0, // integer register
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_UVRSC_VFP = 1, // vfp
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_UVRSC_WMMXD = 3, // Intel WMMX data register
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_UVRSC_WMMXC = 4 // Intel WMMX control register
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} _Unwind_VRS_RegClass;
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typedef enum {
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_UVRSD_UINT32 = 0,
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_UVRSD_VFPX = 1,
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_UVRSD_UINT64 = 3,
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_UVRSD_FLOAT = 4,
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_UVRSD_DOUBLE = 5
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} _Unwind_VRS_DataRepresentation;
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typedef enum {
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_UVRSR_OK = 0,
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_UVRSR_NOT_IMPLEMENTED = 1,
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_UVRSR_FAILED = 2
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} _Unwind_VRS_Result;
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_Unwind_VRS_Result _Unwind_VRS_Get(struct _Unwind_Context *context,
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_Unwind_VRS_RegClass regclass,
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uint32_t regno,
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_Unwind_VRS_DataRepresentation representation,
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void* valuep);
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_Unwind_VRS_Result _Unwind_VRS_Set(struct _Unwind_Context *context,
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_Unwind_VRS_RegClass regclass,
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uint32_t regno,
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_Unwind_VRS_DataRepresentation representation,
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void* valuep);
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#define UNWIND_POINTER_REG 12
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#define UNWIND_STACK_REG 13
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#define UNWIND_IP_REG 15
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uint64_t WRAP(_Unwind_GetGR)(struct _Unwind_Context* ctx, int index) {
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uint32_t val;
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_Unwind_VRS_Get(ctx, _UVRSC_CORE, index, _UVRSD_UINT32, &val);
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return (uint64_t)val;
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}
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void WRAP(_Unwind_SetGR)(struct _Unwind_Context* ctx, int index, uint64_t new_value) {
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uint32_t val = (uint32_t)new_value;
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_Unwind_VRS_Set(ctx, _UVRSC_CORE, index, _UVRSD_UINT32, &val);
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}
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uint64_t WRAP(_Unwind_GetIP)(struct _Unwind_Context* ctx) {
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return WRAP(_Unwind_GetGR)(ctx, UNWIND_IP_REG) & ~1; // thumb bit
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}
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void WRAP(_Unwind_SetIP)(struct _Unwind_Context* ctx, uintptr_t new_value) {
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uint32_t val = (uint32_t)new_value;
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// Propagate thumb bit to instruction pointer
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uint32_t thumbState = WRAP(_Unwind_GetGR)(ctx, UNWIND_IP_REG) & 1;
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uint64_t new_val = (uint64_t)(val | thumbState);
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WRAP(_Unwind_SetGR)(ctx, UNWIND_IP_REG, new_val);
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}
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