1 //===-- HexagonDYLDRendezvous.h ---------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef liblldb_HexagonDYLDRendezvous_H_
11 #define liblldb_HexagonDYLDRendezvous_H_
18 #include "lldb/lldb-defines.h"
19 #include "lldb/lldb-types.h"
21 namespace lldb_private {
25 /// @class HexagonDYLDRendezvous
26 /// Interface to the runtime linker.
28 /// A structure is present in a processes memory space which is updated by the
29 /// runtime liker each time a module is loaded or unloaded. This class
30 /// provides an interface to this structure and maintains a consistent
31 /// snapshot of the currently loaded modules.
32 class HexagonDYLDRendezvous {
34 // This structure is used to hold the contents of the debug rendezvous
35 // information (struct r_debug) as found in the inferiors memory. Note that
36 // the layout of this struct is not binary compatible, it is simply large
37 // enough to hold the information on both 32 and 64 bit platforms.
40 lldb::addr_t map_addr;
46 : version(0), map_addr(LLDB_INVALID_ADDRESS), brk(LLDB_INVALID_ADDRESS),
47 state(0), ldbase(0) {}
51 // Various metadata supplied by the inferior's threading library to describe
52 // the per-thread state.
54 bool valid; // whether we read valid metadata
55 uint32_t dtv_offset; // offset of DTV pointer within pthread
56 uint32_t dtv_slot_size; // size of one DTV slot
57 uint32_t modid_offset; // offset of module ID within link_map
58 uint32_t tls_offset; // offset of TLS pointer within DTV slot
61 HexagonDYLDRendezvous(lldb_private::Process *process);
63 /// Update the internal snapshot of runtime linker rendezvous and recompute
64 /// the currently loaded modules.
66 /// This method should be called once one start up, then once each time the
67 /// runtime linker enters the function given by GetBreakAddress().
69 /// @returns true on success and false on failure.
71 /// @see GetBreakAddress().
74 /// @returns true if this rendezvous has been located in the inferiors
75 /// address space and false otherwise.
78 /// @returns the address of the rendezvous structure in the inferiors
80 lldb::addr_t GetRendezvousAddress() const { return m_rendezvous_addr; }
82 /// Provide the dyld structure address
83 void SetRendezvousAddress(lldb::addr_t);
85 /// @returns the version of the rendezvous protocol being used.
86 uint64_t GetVersion() const { return m_current.version; }
88 /// @returns address in the inferiors address space containing the linked
89 /// list of shared object descriptors.
90 lldb::addr_t GetLinkMapAddress() const { return m_current.map_addr; }
92 /// A breakpoint should be set at this address and Resolve called on each
95 /// @returns the address of a function called by the runtime linker each
96 /// time a module is loaded/unloaded, or about to be loaded/unloaded.
99 lldb::addr_t GetBreakAddress() const { return m_current.brk; }
101 /// In hexagon it is possible that we can know the dyld breakpoint without
102 /// having to find it from the rendezvous structure
104 void SetBreakAddress(lldb::addr_t addr) { m_current.brk = addr; }
106 /// Returns the current state of the rendezvous structure.
107 uint64_t GetState() const { return m_current.state; }
109 /// @returns the base address of the runtime linker in the inferiors address
111 lldb::addr_t GetLDBase() const { return m_current.ldbase; }
113 /// @returns the thread layout metadata from the inferiors thread library.
114 const ThreadInfo &GetThreadInfo();
116 /// @returns true if modules have been loaded into the inferior since the
117 /// last call to Resolve().
118 bool ModulesDidLoad() const { return !m_added_soentries.empty(); }
120 /// @returns true if modules have been unloaded from the inferior since the
121 /// last call to Resolve().
122 bool ModulesDidUnload() const { return !m_removed_soentries.empty(); }
124 void DumpToLog(lldb_private::Log *log) const;
126 /// Constants describing the state of the rendezvous.
129 enum RendezvousState {
135 /// Structure representing the shared objects currently loaded into the
136 /// inferior process.
138 /// This object is a rough analogue to the struct link_map object which
139 /// actually lives in the inferiors memory.
141 lldb::addr_t link_addr; ///< Address of this link_map.
142 lldb::addr_t base_addr; ///< Base address of the loaded object.
143 lldb::addr_t path_addr; ///< String naming the shared object.
144 lldb::addr_t dyn_addr; ///< Dynamic section of shared object.
145 lldb::addr_t next; ///< Address of next so_entry.
146 lldb::addr_t prev; ///< Address of previous so_entry.
147 std::string path; ///< File name of shared object.
149 SOEntry() { clear(); }
151 bool operator==(const SOEntry &entry) { return this->path == entry.path; }
165 typedef std::list<SOEntry> SOEntryList;
168 typedef SOEntryList::const_iterator iterator;
170 /// Iterators over all currently loaded modules.
171 iterator begin() const { return m_soentries.begin(); }
172 iterator end() const { return m_soentries.end(); }
174 /// Iterators over all modules loaded into the inferior since the last call
176 iterator loaded_begin() const { return m_added_soentries.begin(); }
177 iterator loaded_end() const { return m_added_soentries.end(); }
179 /// Iterators over all modules unloaded from the inferior since the last
180 /// call to Resolve().
181 iterator unloaded_begin() const { return m_removed_soentries.begin(); }
182 iterator unloaded_end() const { return m_removed_soentries.end(); }
185 lldb_private::Process *m_process;
187 // Cached copy of executable pathname
188 char m_exe_path[PATH_MAX];
190 /// Location of the r_debug structure in the inferiors address space.
191 lldb::addr_t m_rendezvous_addr;
193 /// Current and previous snapshots of the rendezvous structure.
194 Rendezvous m_current;
195 Rendezvous m_previous;
197 /// List of SOEntry objects corresponding to the current link map state.
198 SOEntryList m_soentries;
200 /// List of SOEntry's added to the link map since the last call to
202 SOEntryList m_added_soentries;
204 /// List of SOEntry's removed from the link map since the last call to
206 SOEntryList m_removed_soentries;
208 /// Threading metadata read from the inferior.
209 ThreadInfo m_thread_info;
211 /// Reads an unsigned integer of @p size bytes from the inferior's address
212 /// space starting at @p addr.
214 /// @returns addr + size if the read was successful and false otherwise.
215 lldb::addr_t ReadWord(lldb::addr_t addr, uint64_t *dst, size_t size);
217 /// Reads an address from the inferior's address space starting at @p addr.
219 /// @returns addr + target address size if the read was successful and
221 lldb::addr_t ReadPointer(lldb::addr_t addr, lldb::addr_t *dst);
223 /// Reads a null-terminated C string from the memory location starting at @p
225 std::string ReadStringFromMemory(lldb::addr_t addr);
227 /// Reads an SOEntry starting at @p addr.
228 bool ReadSOEntryFromMemory(lldb::addr_t addr, SOEntry &entry);
230 /// Updates the current set of SOEntries, the set of added entries, and the
231 /// set of removed entries.
232 bool UpdateSOEntries();
234 bool UpdateSOEntriesForAddition();
236 bool UpdateSOEntriesForDeletion();
238 /// Reads the current list of shared objects according to the link map
239 /// supplied by the runtime linker.
240 bool TakeSnapshot(SOEntryList &entry_list);
242 enum PThreadField { eSize, eNElem, eOffset };
244 bool FindMetadata(const char *name, PThreadField field, uint32_t &value);
247 #endif // liblldb_HexagonDYLDRendezvous_H_