76b1dcfac5
Added debug adapter support for write memory. --------- Co-authored-by: Santhosh Kumar Ellendula <sellendu@hu-sellendu-hyd.qualcomm.com> Co-authored-by: Santhosh Kumar Ellendula <sellendu@hu-sellendu-lv.qualcomm.com>
101 lines
3.5 KiB
C++
101 lines
3.5 KiB
C++
//===-- WriteMemoryRequestHandler.cpp -------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "DAP.h"
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#include "JSONUtils.h"
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#include "RequestHandler.h"
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#include "lldb/API/SBMemoryRegionInfo.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Support/Base64.h"
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namespace lldb_dap {
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// Writes bytes to memory at the provided location.
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//
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// Clients should only call this request if the corresponding capability
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// supportsWriteMemoryRequest is true.
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llvm::Expected<protocol::WriteMemoryResponseBody>
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WriteMemoryRequestHandler::Run(
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const protocol::WriteMemoryArguments &args) const {
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const lldb::addr_t address = args.memoryReference + args.offset.value_or(0);
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;
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lldb::SBProcess process = dap.target.GetProcess();
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if (!lldb::SBDebugger::StateIsStoppedState(process.GetState()))
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return llvm::make_error<NotStoppedError>();
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if (args.data.empty()) {
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return llvm::make_error<DAPError>(
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"Data cannot be empty value. Provide valid data");
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}
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// The VSCode IDE or other DAP clients send memory data as a Base64 string.
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// This function decodes it into raw binary before writing it to the target
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// process memory.
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std::vector<char> output;
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auto decode_error = llvm::decodeBase64(args.data, output);
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if (decode_error) {
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return llvm::make_error<DAPError>(
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llvm::toString(std::move(decode_error)).c_str());
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}
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lldb::SBError write_error;
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uint64_t bytes_written = 0;
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// Write the memory.
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if (!output.empty()) {
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lldb::SBProcess process = dap.target.GetProcess();
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// If 'allowPartial' is false or missing, a debug adapter should attempt to
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// verify the region is writable before writing, and fail the response if it
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// is not.
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if (!args.allowPartial.value_or(false)) {
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// Start checking from the initial write address.
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lldb::addr_t start_address = address;
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// Compute the end of the write range.
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lldb::addr_t end_address = start_address + output.size() - 1;
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while (start_address <= end_address) {
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// Get memory region info for the given address.
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// This provides the region's base, end, and permissions
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// (read/write/executable).
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lldb::SBMemoryRegionInfo region_info;
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lldb::SBError error =
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process.GetMemoryRegionInfo(start_address, region_info);
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// Fail if the region info retrieval fails, is not writable, or the
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// range exceeds the region.
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if (!error.Success() || !region_info.IsWritable()) {
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return llvm::make_error<DAPError>(
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"Memory 0x" + llvm::utohexstr(args.memoryReference) +
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" region is not writable");
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}
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// If the current region covers the full requested range, stop futher
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// iterations.
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if (end_address <= region_info.GetRegionEnd()) {
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break;
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}
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// Move to the start of the next memory region.
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start_address = region_info.GetRegionEnd() + 1;
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}
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}
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bytes_written =
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process.WriteMemory(address, static_cast<void *>(output.data()),
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output.size(), write_error);
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}
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if (bytes_written == 0) {
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return llvm::make_error<DAPError>(write_error.GetCString());
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}
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protocol::WriteMemoryResponseBody response;
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response.bytesWritten = bytes_written;
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return response;
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}
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} // namespace lldb_dap
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