129 lines
4.4 KiB
C++
129 lines
4.4 KiB
C++
/*
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* Copyright (C) 2023 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 "chre/platform/shared/nanoapp_loader.h"
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namespace chre {
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bool NanoappLoader::relocateTable(DynamicHeader *dyn, int tag) {
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bool success = false;
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if (dyn == nullptr) {
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return false;
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}
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switch (tag) {
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case DT_RELA: {
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if (getDynEntry(dyn, tag) == 0) {
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LOGE("RISC-V Elf binaries must have DT_RELA dynamic entry");
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break;
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}
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// The value of the RELA entry in dynamic table is the sh_addr field
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// of ".rela.dyn" section header. We actually need to use the sh_offset
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// which is usually the same, but on occasions can be different.
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SectionHeader *dynamicRelaTablePtr = getSectionHeader(".rela.dyn");
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CHRE_ASSERT(dynamicRelaTablePtr != nullptr);
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ElfRela *reloc =
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reinterpret_cast<ElfRela *>(mBinary + dynamicRelaTablePtr->sh_offset);
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size_t relocSize = dynamicRelaTablePtr->sh_size;
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size_t nRelocs = relocSize / sizeof(ElfRela);
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LOGV("Relocation %zu entries in DT_RELA table", nRelocs);
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for (size_t i = 0; i < nRelocs; ++i) {
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ElfRela *curr = &reloc[i];
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int relocType = ELFW_R_TYPE(curr->r_info);
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ElfAddr *addr = reinterpret_cast<ElfAddr *>(mMapping + curr->r_offset);
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switch (relocType) {
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case R_RISCV_RELATIVE:
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LOGV("Resolving RISCV_RELATIVE at offset %lx",
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static_cast<long unsigned int>(curr->r_offset));
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// TODO(b/155512914): When we move to DRAM allocations, we need to
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// check if the above address is in a Read-Only section of memory,
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// and give it temporary write permission if that is the case.
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*addr = reinterpret_cast<uintptr_t>(mMapping + curr->r_addend);
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break;
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case R_RISCV_32: {
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LOGV("Resolving RISCV_32 at offset %lx",
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static_cast<long unsigned int>(curr->r_offset));
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size_t posInSymbolTable = ELFW_R_SYM(curr->r_info);
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auto *dynamicSymbolTable =
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reinterpret_cast<ElfSym *>(getDynamicSymbolTable());
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ElfSym *sym = &dynamicSymbolTable[posInSymbolTable];
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*addr = reinterpret_cast<uintptr_t>(mMapping + sym->st_value);
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break;
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}
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default:
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LOGE("Unsupported relocation type %u", relocType);
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break;
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}
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}
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success = true;
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break;
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}
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case DT_REL:
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// Not required for RISC-V
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success = true;
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break;
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default:
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LOGE("Unsupported table tag %d", tag);
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}
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return success;
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}
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bool NanoappLoader::resolveGot() {
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ElfAddr *addr;
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ElfRela *reloc = reinterpret_cast<ElfRela *>(
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mMapping + getDynEntry(getDynamicHeader(), DT_JMPREL));
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size_t relocSize = getDynEntry(getDynamicHeader(), DT_PLTRELSZ);
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size_t nRelocs = relocSize / sizeof(ElfRela);
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LOGV("Resolving GOT with %zu relocations", nRelocs);
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for (size_t i = 0; i < nRelocs; ++i) {
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ElfRela *curr = &reloc[i];
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int relocType = ELFW_R_TYPE(curr->r_info);
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switch (relocType) {
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case R_RISCV_JUMP_SLOT: {
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LOGV("Resolving RISCV_JUMP_SLOT at offset %lx, %d",
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static_cast<long unsigned int>(curr->r_offset), curr->r_addend);
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addr = reinterpret_cast<ElfAddr *>(mMapping + curr->r_offset);
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size_t posInSymbolTable = ELFW_R_SYM(curr->r_info);
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void *resolved = resolveData(posInSymbolTable);
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if (resolved == nullptr) {
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LOGV("Failed to resolve symbol(%zu) at offset 0x%x", i,
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curr->r_offset);
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return false;
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}
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*addr = reinterpret_cast<ElfAddr>(resolved) + curr->r_addend;
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break;
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}
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default:
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LOGE("Unsupported relocation type: %u for symbol %s", relocType,
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getDataName(getDynamicSymbol(ELFW_R_SYM(curr->r_info))));
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return false;
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}
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}
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return true;
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}
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} // namespace chre
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