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Diffstat (limited to 'source/Plugins/DynamicLoader/POSIX-DYLD/DYLDRendezvous.cpp')
-rw-r--r--source/Plugins/DynamicLoader/POSIX-DYLD/DYLDRendezvous.cpp336
1 files changed, 336 insertions, 0 deletions
diff --git a/source/Plugins/DynamicLoader/POSIX-DYLD/DYLDRendezvous.cpp b/source/Plugins/DynamicLoader/POSIX-DYLD/DYLDRendezvous.cpp
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index 000000000000..3e1b52938f49
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+++ b/source/Plugins/DynamicLoader/POSIX-DYLD/DYLDRendezvous.cpp
@@ -0,0 +1,336 @@
+//===-- DYLDRendezvous.cpp --------------------------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// C Includes
+// C++ Includes
+// Other libraries and framework includes
+#include "lldb/Core/ArchSpec.h"
+#include "lldb/Core/Error.h"
+#include "lldb/Core/Log.h"
+#include "lldb/Core/Module.h"
+#include "lldb/Target/Process.h"
+#include "lldb/Target/Target.h"
+
+#include "DYLDRendezvous.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+/// Locates the address of the rendezvous structure. Returns the address on
+/// success and LLDB_INVALID_ADDRESS on failure.
+static addr_t
+ResolveRendezvousAddress(Process *process)
+{
+ addr_t info_location;
+ addr_t info_addr;
+ Error error;
+ size_t size;
+
+ info_location = process->GetImageInfoAddress();
+
+ if (info_location == LLDB_INVALID_ADDRESS)
+ return LLDB_INVALID_ADDRESS;
+
+ info_addr = 0;
+ size = process->DoReadMemory(info_location, &info_addr,
+ process->GetAddressByteSize(), error);
+ if (size != process->GetAddressByteSize() || error.Fail())
+ return LLDB_INVALID_ADDRESS;
+
+ if (info_addr == 0)
+ return LLDB_INVALID_ADDRESS;
+
+ return info_addr;
+}
+
+DYLDRendezvous::DYLDRendezvous(Process *process)
+ : m_process(process),
+ m_rendezvous_addr(LLDB_INVALID_ADDRESS),
+ m_current(),
+ m_previous(),
+ m_soentries(),
+ m_added_soentries(),
+ m_removed_soentries()
+{
+ // Cache a copy of the executable path
+ if (m_process)
+ {
+ Module *exe_mod = m_process->GetTarget().GetExecutableModulePointer();
+ if (exe_mod)
+ exe_mod->GetFileSpec().GetPath(m_exe_path, PATH_MAX);
+ }
+}
+
+bool
+DYLDRendezvous::Resolve()
+{
+ const size_t word_size = 4;
+ Rendezvous info;
+ size_t address_size;
+ size_t padding;
+ addr_t info_addr;
+ addr_t cursor;
+
+ address_size = m_process->GetAddressByteSize();
+ padding = address_size - word_size;
+
+ if (m_rendezvous_addr == LLDB_INVALID_ADDRESS)
+ cursor = info_addr = ResolveRendezvousAddress(m_process);
+ else
+ cursor = info_addr = m_rendezvous_addr;
+
+ if (cursor == LLDB_INVALID_ADDRESS)
+ return false;
+
+ if (!(cursor = ReadMemory(cursor, &info.version, word_size)))
+ return false;
+
+ if (!(cursor = ReadMemory(cursor + padding, &info.map_addr, address_size)))
+ return false;
+
+ if (!(cursor = ReadMemory(cursor, &info.brk, address_size)))
+ return false;
+
+ if (!(cursor = ReadMemory(cursor, &info.state, word_size)))
+ return false;
+
+ if (!(cursor = ReadMemory(cursor + padding, &info.ldbase, address_size)))
+ return false;
+
+ // The rendezvous was successfully read. Update our internal state.
+ m_rendezvous_addr = info_addr;
+ m_previous = m_current;
+ m_current = info;
+
+ return UpdateSOEntries();
+}
+
+bool
+DYLDRendezvous::IsValid()
+{
+ return m_rendezvous_addr != LLDB_INVALID_ADDRESS;
+}
+
+bool
+DYLDRendezvous::UpdateSOEntries()
+{
+ SOEntry entry;
+
+ if (m_current.map_addr == 0)
+ return false;
+
+ // When the previous and current states are consistent this is the first
+ // time we have been asked to update. Just take a snapshot of the currently
+ // loaded modules.
+ if (m_previous.state == eConsistent && m_current.state == eConsistent)
+ return TakeSnapshot(m_soentries);
+
+ // If we are about to add or remove a shared object clear out the current
+ // state and take a snapshot of the currently loaded images.
+ if (m_current.state == eAdd || m_current.state == eDelete)
+ {
+ assert(m_previous.state == eConsistent);
+ m_soentries.clear();
+ m_added_soentries.clear();
+ m_removed_soentries.clear();
+ return TakeSnapshot(m_soentries);
+ }
+ assert(m_current.state == eConsistent);
+
+ // Otherwise check the previous state to determine what to expect and update
+ // accordingly.
+ if (m_previous.state == eAdd)
+ return UpdateSOEntriesForAddition();
+ else if (m_previous.state == eDelete)
+ return UpdateSOEntriesForDeletion();
+
+ return false;
+}
+
+bool
+DYLDRendezvous::UpdateSOEntriesForAddition()
+{
+ SOEntry entry;
+ iterator pos;
+
+ assert(m_previous.state == eAdd);
+
+ if (m_current.map_addr == 0)
+ return false;
+
+ for (addr_t cursor = m_current.map_addr; cursor != 0; cursor = entry.next)
+ {
+ if (!ReadSOEntryFromMemory(cursor, entry))
+ return false;
+
+ // Only add shared libraries and not the executable.
+ // On Linux this is indicated by an empty path in the entry.
+ // On FreeBSD it is the name of the executable.
+ if (entry.path.empty() || ::strcmp(entry.path.c_str(), m_exe_path) == 0)
+ continue;
+
+ pos = std::find(m_soentries.begin(), m_soentries.end(), entry);
+ if (pos == m_soentries.end())
+ {
+ m_soentries.push_back(entry);
+ m_added_soentries.push_back(entry);
+ }
+ }
+
+ return true;
+}
+
+bool
+DYLDRendezvous::UpdateSOEntriesForDeletion()
+{
+ SOEntryList entry_list;
+ iterator pos;
+
+ assert(m_previous.state == eDelete);
+
+ if (!TakeSnapshot(entry_list))
+ return false;
+
+ for (iterator I = begin(); I != end(); ++I)
+ {
+ pos = std::find(entry_list.begin(), entry_list.end(), *I);
+ if (pos == entry_list.end())
+ m_removed_soentries.push_back(*I);
+ }
+
+ m_soentries = entry_list;
+ return true;
+}
+
+bool
+DYLDRendezvous::TakeSnapshot(SOEntryList &entry_list)
+{
+ SOEntry entry;
+
+ if (m_current.map_addr == 0)
+ return false;
+
+ for (addr_t cursor = m_current.map_addr; cursor != 0; cursor = entry.next)
+ {
+ if (!ReadSOEntryFromMemory(cursor, entry))
+ return false;
+
+ // Only add shared libraries and not the executable.
+ // On Linux this is indicated by an empty path in the entry.
+ // On FreeBSD it is the name of the executable.
+ if (entry.path.empty() || ::strcmp(entry.path.c_str(), m_exe_path) == 0)
+ continue;
+
+ entry_list.push_back(entry);
+ }
+
+ return true;
+}
+
+addr_t
+DYLDRendezvous::ReadMemory(addr_t addr, void *dst, size_t size)
+{
+ size_t bytes_read;
+ Error error;
+
+ bytes_read = m_process->DoReadMemory(addr, dst, size, error);
+ if (bytes_read != size || error.Fail())
+ return 0;
+
+ return addr + bytes_read;
+}
+
+std::string
+DYLDRendezvous::ReadStringFromMemory(addr_t addr)
+{
+ std::string str;
+ Error error;
+ size_t size;
+ char c;
+
+ if (addr == LLDB_INVALID_ADDRESS)
+ return std::string();
+
+ for (;;) {
+ size = m_process->DoReadMemory(addr, &c, 1, error);
+ if (size != 1 || error.Fail())
+ return std::string();
+ if (c == 0)
+ break;
+ else {
+ str.push_back(c);
+ addr++;
+ }
+ }
+
+ return str;
+}
+
+bool
+DYLDRendezvous::ReadSOEntryFromMemory(lldb::addr_t addr, SOEntry &entry)
+{
+ size_t address_size = m_process->GetAddressByteSize();
+
+ entry.clear();
+
+ if (!(addr = ReadMemory(addr, &entry.base_addr, address_size)))
+ return false;
+
+ if (!(addr = ReadMemory(addr, &entry.path_addr, address_size)))
+ return false;
+
+ if (!(addr = ReadMemory(addr, &entry.dyn_addr, address_size)))
+ return false;
+
+ if (!(addr = ReadMemory(addr, &entry.next, address_size)))
+ return false;
+
+ if (!(addr = ReadMemory(addr, &entry.prev, address_size)))
+ return false;
+
+ entry.path = ReadStringFromMemory(entry.path_addr);
+
+ return true;
+}
+
+void
+DYLDRendezvous::DumpToLog(Log *log) const
+{
+ int state = GetState();
+
+ if (!log)
+ return;
+
+ log->PutCString("DYLDRendezvous:");
+ log->Printf(" Address: %" PRIx64, GetRendezvousAddress());
+ log->Printf(" Version: %" PRIu64, GetVersion());
+ log->Printf(" Link : %" PRIx64, GetLinkMapAddress());
+ log->Printf(" Break : %" PRIx64, GetBreakAddress());
+ log->Printf(" LDBase : %" PRIx64, GetLDBase());
+ log->Printf(" State : %s",
+ (state == eConsistent) ? "consistent" :
+ (state == eAdd) ? "add" :
+ (state == eDelete) ? "delete" : "unknown");
+
+ iterator I = begin();
+ iterator E = end();
+
+ if (I != E)
+ log->PutCString("DYLDRendezvous SOEntries:");
+
+ for (int i = 1; I != E; ++I, ++i)
+ {
+ log->Printf("\n SOEntry [%d] %s", i, I->path.c_str());
+ log->Printf(" Base : %" PRIx64, I->base_addr);
+ log->Printf(" Path : %" PRIx64, I->path_addr);
+ log->Printf(" Dyn : %" PRIx64, I->dyn_addr);
+ log->Printf(" Next : %" PRIx64, I->next);
+ log->Printf(" Prev : %" PRIx64, I->prev);
+ }
+}
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