thermosphere: rewrite gdb/mem in c++. Remove SearchMemory handler

thermosphere/src/gdb/hvisor_gdb_mem.cpp

@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2019-2020 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+*   This file is part of Luma3DS.
+*   Copyright (C) 2016-2019 Aurora Wright, TuxSH
+*
+*   SPDX-License-Identifier: (MIT OR GPL-2.0-or-later)
+*/
+
+#include "hvisor_gdb_defines_internal.hpp"
+#include "hvisor_gdb_packet_data.hpp"
+
+#include "../core_ctx.h"
+#include "../guest_memory.h"
+
+namespace ams::hvisor::gdb {
+
+    int Context::SendMemory(uintptr_t addr, size_t len, std::string_view prefix)
+    {
+        char *buf = GetInPlaceOutputBuffer();
+        char *membuf = GetWorkBuffer();
+
+        size_t prefixLen = prefix.size();
+
+        if(prefixLen + 2 * len > GDB_BUF_LEN) {
+            // gdb shouldn't send requests which responses don't fit in a packet
+            return prefixLen == 0 ? ReplyErrno(ENOMEM) : -1;
+        }
+
+        size_t total = guestReadMemory(addr, len, membuf);
+
+        if (total == 0) {
+            return prefixLen == 0 ? ReplyErrno(EFAULT) : -EFAULT;
+        } else {
+            std::copy(prefix.begin(), prefix.end(), buf);
+            EncodeHex(buf + prefixLen, membuf, total);
+            return SendPacket(std::string_view{buf, prefixLen + 2 * total});
+        }
+    }
+
+    int Context::WriteMemoryImpl(size_t (*decoder)(void *, const void *, size_t))
+    {
+        char *workbuf = GetWorkBuffer();
+
+        auto [nread, addr, len] = ParseHexIntegerList<2>(m_commandData, ':');
+        if (nread == 0) {
+            return ReplyErrno(EILSEQ);
+        }
+
+        m_commandData.remove_prefix(nread);
+        if (len > m_commandData.length() / 2) {
+            // Data len field doesn't match what we got...
+            return ReplyErrno(ENOMEM);
+        }
+
+        size_t n = decoder(workbuf, m_commandData.data(), m_commandData.size());
+
+        if(n != len) {
+            // Decoding error...
+            return ReplyErrno(EILSEQ);
+        }
+
+        size_t total = guestWriteMemory(addr, len, workbuf);
+        return total == len ? ReplyOk() : ReplyErrno(EFAULT);
+    }
+
+
+    GDB_DEFINE_HANDLER(ReadMemory)
+    {
+        auto [nparsed, addr, len] = ParseHexIntegerList<2>(m_commandData);
+        if (nparsed == 0) {
+            return ReplyErrno(EILSEQ);
+        }
+
+        return SendMemory(addr, len);
+    }
+
+    GDB_DEFINE_HANDLER(WriteMemory)
+    {
+        return WriteMemoryImpl(DecodeHex);
+    }
+
+    GDB_DEFINE_HANDLER(WriteMemoryRaw)
+    {
+        return WriteMemoryImpl(UnescapeBinaryData);
+    }
+
+}