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/**
***************************************************************************
***************************************************************************
***************************************************************************

\page release_notes Release Notes for Version \DR_VERSION

This section is divided into the following subsections:

 - \ref sec_package
\ifnot vmsafe
 - \ref sec_changes
\endif
 - \ref sec_limits
\ifnot vmsafe
 - \ref sec_future
\endif

***************************************************************************
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\section sec_package Distribution Contents

The following are part of the DynamoRIO release distribution:

\if profiling
  PR 225255: list profile library too
\endif

 - Four different DynamoRIO libraries: debug and release for each of
   32-bit and 64-bit.
   The debug library enables assertion messages to more easily diagnose
   API usage errors.
 - Four different IA-32/AMD64 decoding static libraries: debug and release
   for each of 32-bit and 64-bit.
   The debug library enables assertion messages to more easily diagnose
   API usage errors.
 - A variety of DynamoRIO Extension libraries that augment the core
   DynamoRIO API (see \ref page_ext).
 - Additional Extension libraries from the Dr. Memory Framework (DRMF).
   If this documentation is part of a DynamoRIO public release, <a
   href="../../drmemory/drmemory/docs/html/page_drmf.html">this link</a> should
   point at the local documentation for DRMF.
 - The DynamoRIO configuration and execution libraries and command-line
   utilities \c drconfiglib.dll, \c drinjectlib.dll, \c drfrontendlib.dll,
   \c drconfig.exe, \c drrun.exe, and \c drinject.exe.
   On Linux, the tools are named \c drconfig, \c drrun, and \c drinject.
 - A utility \c drview.exe for viewing which processes
   are running under DynamoRIO control (Windows package only).
 - Header files for the DynamoRIO APIs.
 - This documentation.
 - \ref API_samples "Sample clients".
\ifnot vmsafe
 - A graphical statistics viewer \c DRstats.exe that displays internal
   DynamoRIO statistics as well as custom statistics defined
   by a client (see \ref sec_drstats) (Windows package only).
   DynamoRIO exports a large number of statistics in its debug build, and
   a handful in release builds.
\endif
\ifnot vmsafe
 - A binary tracedump reader, which also functions as a sample
   client using DynamoRIO as a standalone library (see \ref
   sec_standalone).
\endif
 - A number of end-user tools including a code coverage tool (see \ref
   page_drcov) and a library tracing tool (see \ref page_drltrace).
   If this is a DynamoRIO public release, it also includes the
   Dr. Memory memory debugging tool (see \ref page_drmemory), a system call
   tracer for Windows (see \ref page_drstrace), and a symbol querying tool
   (see \ref page_symquery).

When unpacking the release package on Windows, be aware that the Cygwin
unzip utility does not preserve executable permissions properly.  After
unzipping with Cygwin, add ugo+rx permissions to all of the .dll and .exe
files in the resulting directory tree:
\code
find . -name \*.dll -exec chmod ugo+rx {} \; -o -name \*.exe -exec chmod ugo+rx {} \;
\endcode

\ifnot vmsafe
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\section sec_changes Changes Since Prior Releases

The current version is \DR_VERSION.  It includes Dr. Memory and the
Dr. Memory Framework (DRMF) in the same package as DynamoRIO.  DRMF
provides the umbra, drsyscall, and drsymcache Extensions for use by
clients.

The changes between version \DR_VERSION and 5.0.0 include the
following minor compatibility changes:

 - To support conditionally executed instructions, added a new parameter of
   type #dr_opnd_query_flags_t to routines that explicitly query what was
   read or written by an instruction: instr_get_eflags(),
   instr_get_arith_flags(), decode_eflags_usage(), instr_writes_to_reg(),
   instr_reads_from_reg(), and instr_writes_to_exact_reg().  This new
   parameter determines how to treat conditionally accessed operands.  We
   decided that breaking compatibility directly was the best solution to
   ensure that clients performing liveness analysis versus other types of
   usage analysis are properly updated to handle conditionally executed
   instructions.  All other API routines include all operands whether
   conditionally accessed or not.
 - Removed the artificial additional source operand that was added to each
   OP_cmovcc and OP_fcmovcc instruction in the past.  We have replaced this
   with the new predication API (instr_is_predicated(), etc.) and new
   parameters to read/write query routines (#dr_opnd_query_flags_t).
 - Widened the #reg_id_t type from a byte to a ushort.
 - Deprecated set_x86_mode(), replacing it with dr_set_isa_mode().
 - Deprecated get_x86_mode(), replacing it with dr_get_isa_mode().
 - Deprecated instr_set_x86_mode(), replacing it with instr_set_isa_mode().
 - Deprecated instr_get_x86_mode(), replacing it with instr_get_isa_mode().

Further non-compatibility-affecting changes include:

 - Added distinctions between reasons for dr_query_memory_ex() to fail
 - Added opnd_size_in_bits().
 - Added cross-platform instruction creation macros
   XINST_CREATE_debug_instr(), XINST_CREATE_load(), XINST_CREATE_store(),
   XINST_CREATE_move(), XINST_CREATE_load_simd(), XINST_CREATE_store_simd(),
   XINST_CREATE_jump_mem(), XINST_CREATE_load_int(),
   XINST_CREATE_return(), XINST_CREATE_jump(),
   XINST_CREATE_add(), XINST_CREATE_add_s(),
   XINST_CREATE_sub(), XINST_CREATE_sub_s(),
   XINST_CREATE_and_s(), XINST_CREATE_cmp(),
   and XINST_CREATE_interrupt().
 - Added instr_is_predicated(), instr_get_predicate(), and
   instr_set_predicate().
 - Added instr_predicate_triggered().
 - Added dr_save_arith_flags_to_reg() and dr_restore_arith_flags_from_reg().
 - Added opnd_get_index_shift() and opnd_set_index_shift().
 - Added opnd_create_reg_ex() and opnd_get_flags().
 - Added opnd_create_base_disp_arm().
 - Added reg_is_simd().
 - Added instr_create_1dst_4src().

**************************************************
<hr>

Version \DR_VERSION includes Dr. Memory and the Dr. Memory Framework (DRMF)
in the same package as DynamoRIO.  DRMF provides the umbra, drsyscall, and
drsymcache Extensions for use by clients.

The changes between version \DR_VERSION and 4.2.0 also include the
following minor compatibility changes:

 - Dropped official support for Windows 2000.  The core DynamoRIO engine
   should continue to work there, but the official release package
   will not run on Windows 2000.
 - Changed the third parameter to drsym_search_symbols_ex() from a bool to
   a uint flags in order to take in demangling flags.  Binary compatibility
   is maintained as drsym_info_t's size was changed, but source
   compatibility is affected by this change.
 - Added collapsing of template parameters to "<>" for drsyms operations on
   Windows PDB symbols when #DRSYM_DEMANGLE is specified.  This can be
   undone by specifying #DRSYM_DEMANGLE_PDB_TEMPLATES.
 - Removed empty parentheses "()" from partially-demangled symbols (when
   #DRSYM_DEMANGLE is specified) for #DRSYM_ELF_SYMTAB and #DRSYM_PECOFF_SYMTAB.
   Windows and Linux symbols are now consistent for #DRSYM_DEMANGLE.
 - Changed the operand sizes of instructions that read or write only part
   of a multimedia register (mmx, xmm, or ymm) to reflect the partial size.
 - Added return value for dr_fprintf to indicate how many bytes are written.
 - Renamed the function add_rel_rpaths() in DynamoRIOConfig.cmake to
   DynamoRIO_add_rel_rpaths().
 - Deprecated instr_ok_to_mangle() and instr_set_ok_to_mangle()
   (replaced with instr_is_app(), instr_is_meta(), instr_set_app(), and
   instr_set_meta()).

Further non-compatibility-affecting changes include:

 - Added dr_syscall_get_result_ex() and dr_syscall_set_result_ex() for
   future MacOS support.
 - Added Mach-O support to drsyms.
 - Added INSTR_CREATE_cmpxchg_8() for 64-bit cmpxchg
 - Changed the default -stderr_mask on Windows to 0xC (for both release
   and debug), and the default -msgbox_mask on Windows release builds
   to 0xC, for better error reporting.  For interactive runs, then,
   the user should explicitly pass -msgbox_mask 0.
 - Added a flags output parameter to #drsym_info_t.
 - Added dr_module_contains_addr() to make handling non-contiguous
   libraries easier.
 - Added hashtable_lock_self_owns() to the drcontainers Extension.
 - Added opnd_create_reg_partial() and opnd_is_reg_partial() for
   representing a partial multimedia register
 - Added operand size suffixes on disassembly in the default mode.
   This can be disabled via -disasm_mask 0x8 or by calling
   disassemble_set_syntax(DR_DISASM_NO_OPND_SIZE).
 - Added instr_zeroes_ymmh().
 - Added new fields to module_data_t: timestamp for Linux and MacOS, and
   version and uuid fields for MacOS.
 - Added a new library drfrontendlib to be used for building tool
   front-ends.  For more information see dr_frontend.h.
 - Added dr_create_memory_dump().
 - Added dr_mcontext_to_context().
 - Added dr_call_on_clean_stack().
 - Added dr_set_client_name() for customizing the diagnostic message
   presented to users when an error occurs or when dr_messagebox() is called.
 - Added instr_get_next_app() and instrlist_first_app() to allow clients to
   traverse only application (non-meta) instructions.
 - Added dr_config_status_code_to_string().
 - Added custom tool front-end launching support to drrrun tool config files.
 - Added a tool notification feature to drrun tool config files.
 - Added get_visualstudio_info() for looking up visual studio
   installation information.
 - Renamed the strace sample to "syscall" and removed its tracing feature,
   in favor of a superior strace sample inside DRMF.
 - Included a copy of dbghelp.dll for drsyms
 - Added dr_insert_cbr_instrumentation_ex(),
   which provides the fall-through address.
 - Added instr_is_app(), instr_is_meta(), instr_set_app(), and instr_set_meta().
 - Added reg_get_value_ex().

**************************************************
<hr>
The changes between version 4.2.0 and 4.1.0 include:

 - Added preliminary Windows 8.1 support
 - Added a new \ref page_drltrace
 - Re-branded our \ref page_drcov
 - Added an export iterator: dr_symbol_export_iterator_start(),
   dr_symbol_export_iterator_hasnext(), dr_symbol_export_iterator_next(),
   dr_symbol_export_iterator_stop()
 - Added relative directory support to file routines on Windows
 - Added dr_get_current_directory()
 - Added dr_delete_dir()
 - Added drx_open_unique_file() and drx_open_unique_appid_file()
 - Added proc_avx_enabled()
 - Added support for recent IA-32/AMD64 instructions: the rdrand,
   fsgsbase, FMA4, XOP, TBM, LWP, BMI1, BMI2, SMX, INVPCID,
   TSX, and AVX2 instruction groups
 - Added vector addressing (VSIB) support to instr_compute_address(),
   instr_compute_address_ex() and
   instr_compute_address_ex_pos()
 - Added opnd_is_vsib()
 - Fixed misnamed opcodes: OP_pmovsxdw is now OP_pmovsxwd,
   OP_pmovzxdw is now OP_pmovzxwd, OP_vpmovsxdw is now OP_vpmovsxwd,
   and OP_vpmovzxdw is now OP_vpmovzxwd.
 - Renamed DRgui to DRstats in anticipation of a new DRgui graphical tool framework
 - dr_exit_process() now supports sending a fatal signal via the 2nd byte of
   the exit code being set to the signal number
 - Added a return value of NULL to dr_standalone_init() to indicate
   failure, such as running on an unsupported OS
 - Added a "soft kills" feature to the \p drx Extension via
   drx_register_soft_kills() to avoid child process termination preventing
   output of instrumentation results
 - Added dr_convert_pid_to_handle()
 - Added dr_syscall_intercept_natively()
 - Added dr_app_handle_mbr_target()
 - Added dr_app_running_under_dynamorio()
 - Added drvector_set_entry()
 - Re-ordered the initial thread init event to be prior to the initial
   module load events
 - Changed DynamoRIO_USE_LIBC to be on by default for all clients,
   including clients written in C
 - Added static library versions of most Extension libraries: drmgr_static,
   drutil_static, drwrap_static, drsyms_static, and drx_static.
   Be sure to check the licenses and other restrictions (in particular,
   most of these Extensions will not work properly if duplicated)
   before using these static versions.
 - Various bug fixes

**************************************************
<hr>
The changes between version 4.1.0 and 4.0.1 include the
following compatibility changes:

 - The #drsym_info_t data structure has changed.  The file name is now
   a caller-allocated buffer, and it and the symbol name are separated out.
   This affects code that calls drsym_lookup_address().
 - Memory allocated through system libraries (including malloc, operator
   new, and HeapAlloc) is not guaranteed to be reachable by a 32-bit
   displacement from the code cache: only memory directly allocated via
   DR's API.  The \ref op_reachable_heap "-reachable_heap runtime option"
   can be used to guarantee that all memory is reachable.
 - For 64-bit, the opcode constants OP_fxsave, OP_fxrstor, OP_xsave,
   OP_xrstor, and OP_xsaveopt have all been replaced with two versions: one
   with a "32" suffix and one with a "64" suffix.  E.g., OP_fxsave is split
   into #OP_fxsave32 and #OP_fxsave64.  The 32 version corresponds to the
   no-suffix assembler mnemonic while the 64 version coresponds to the
   assembler mnemonic of the same name.  Previously, the 64-bit versions of
   these instrutions could not be distinguished nor encoded from scratch.

Further non-compatibility-affecting changes include:

 - Added instr_is_floating_ex()
 - Ported the stats.c sample and DRgui to 64-bit.  As part of this, the
   shared memory structure changed shape on Windows: pid is now of type
   process_id_t.
 - Added the \p drtable Extension which provides simple table management
 - Added opnd_size_from_bytes()
 - Added path searching support to dr_load_aux_library()
 - Added limited, experimental support for 32-bit WOW64 clients to use
   64-bit libraries and code via dr_load_aux_x64_library(),
   dr_lookup_aux_x64_library_routine(), dr_unload_aux_x64_library(), and
   dr_invoke_x64_routine().
 - Added drmgr_current_bb_phase()
 - The deployment tools (drrun, drconfig, and drinject) are now helper
   binaries instead of shell scripts.
 - The deployment tools (drrun etc.) now interpret -v as an alias for
   -verbose and use -version to print version info.
 - Added instrlist_insert_mov_immed_ptrsz() and instrlist_insert_push_immed_ptrsz()
 - Added instrlist_insert_mov_instr_addr() and instrlist_insert_push_instr_addr()
 - Added drsym_enumerate_lines()
 - Added #DR_DISASM_STRICT_INVALID
 - Added a new runtime option \ref op_syntax_att "-syntax_att" for
   AT&T-style disassembly that hides the implicit operands.
   Also added #DR_DISASM_DR to name DR's default disassembly style, with
   #DR_DISASM_ATT selecting a true AT&T disassembly style that hides
   implicit operands.  The only compatibility change here is if a client
   selected DR_DISASM_ATT and expected DR-style disassembly.
 - Added #DR_MAP_IMAGE
 - Added -t option to drrun for end-user tools
 - Added 64-bit reachability support to dr_insert_call() and
   dr_insert_clean_call().  Added explicit control over reachability
   in a new routine dr_insert_call_ex() and in #DR_CLEANCALL_INDIRECT
   for dr_insert_clean_call_ex().
 - Added auto-magic conversion of absolute and pc-relative memory
   operands to each other for more flexible 64-bit encoding.
 - Added opnd_create_instr_ex() and opnd_get_shift()
 - Added dr_custom_alloc()
 - Added dr_raw_mremap() and dr_raw_brk()
 - Added #DR_EMIT_GO_NATIVE, dr_suspend_all_other_threads_ex(),
   dr_retakeover_suspended_native_thread(), and dr_is_thread_native() for
   temporarily-native support.
 - Added dr_get_token()
 - Added dr_switch_to_app_state_ex() and dr_switch_to_dr_state_ex()
 - Added dr_is_nudge_thread()
 - Added support for nudging 64-bit Windows applications
 - Added dr_get_dr_thread_handle()
 - Added #DR_MEMTYPE_RESERVED to #dr_mem_info_t
 - proc_save_fpstate(), proc_restore_fpstate(), dr_insert_save_fpstate(),
   and dr_insert_restore_fpstate() now use the current thread's x86 mode
   to determine which fxsave state format to use.
 - Added partial support for presenting the proper floating point program
   counter when floating point state is saved.
   Xref the \ref op_translate_fpu_pc "-translate_fpu_pc runtime option".
 - Added \p drx Extension: the DynamoRIO Instrumentation Utility
   Extension with BSD license
 - Added automatic restarting of appropriate system calls interrupted by signals.
 - Various bug fixes

**************************************************
<hr>
The changes between version 4.0.1 and 4.0.0 include:

 - Fixed a bug resulting in large 64-bit applications failing to allocate
   heap (Issue 1041)

**************************************************
<hr>
The changes between version 4.0.0 and 3.2.0 include a
compatibility change in the drsyms Extension:

 - Changed the drsyms type query data structures (#drsym_type_t,
   #drsym_func_type_t, #drsym_int_type_t, #drsym_ptr_type_t).
   This is a binary compatibility change for drsym_get_func_type().

And in the drmgr Extension:

 - The post-syscall, module load, module unload, signal, exception,
   and restore state events are now mediated and ordered by drmgr.
   Thus, clients should call drmgr_register_post_syscall_event()
   (for a default priority) or drmgr_register_post_syscall_event_ex() (to
   specify a priority) rather than
   dr_register_post_syscall_event().  The same applies to
   drmgr_register_module_load_event() +
   drmgr_register_module_load_event_ex(),
   drmgr_register_module_unload_event() +
   drmgr_register_module_unload_event_ex(),
   drmgr_register_signal_event() +
   drmgr_register_signal_event_ex(),
   drmgr_register_exception_event() +
   drmgr_register_exception_event_ex(), and
   drmgr_register_restore_state_event() +
   drmgr_register_restore_state_ex_event() +
   drmgr_register_restore_state_ex_event_ex().

And in the core API:

 - dr_get_milliseconds() now returns the number of milliseconds since Jan
   1, 1601 on all platforms.

And in the non-core APIs:

 - dr_inject_process_create() now takes a NULL-terminated array of strings for
   the app command line to better support porting to Linux.

Further non-compatibility-affecting changes include:

 - Added preliminary Windows 8 support, though private kernelbase.dll is
   not yet supported
 - Added persistent cache support for clients via
   dr_register_persist_ro(), dr_register_persist_rx(),
   dr_register_persist_rw(), dr_register_persist_patch(), and
   #DR_EMIT_PERSISTABLE.  However, dr_register_persist_patch() is
   still experimental, is in flux, and is subject to change in
   the next release.
 - Added hashtable persistence support via hashtable_persist_size(),
   hashtable_persist(), and hashtable_resurrect()
 - Added drsym_get_type(), drsym_expand_type(), and support for additional
   type categories for Windows drsyms.
 - Ported the drinjectlib and drconfiglib libraries to Linux.  Routines that
   are still Windows-only are marked in the API docs.
 - Added dr_inject_prepare_to_exec() on Linux
 - Added drsym_free_resources()
 - Added drsym_module_has_symbols()
 - Added a type_id field to drsym_info_t (without compatibility changes)
 - Added drsym_enumerate_symbols_ex() and drsym_search_symbols_ex() which
   return drsym_info_t on each symbol
 - Added dr_exit_process() to cleanly shut down with a specified
   exit code
 - Added dr_convert_handle_to_pid()
 - Added dr_nudge_client_ex() to enable nudging other processes
   from within a client
 - Added reg_resize_to_opsz()
 - Added dr_save_arith_flags_to_xax() and dr_restore_arith_flags_from_xax()
 - Added dr_snwprintf() and dr_vsnwprintf()
 - Added drwrap_replace_native(), drwrap_is_replaced(),
   drwrap_is_replaced_native()
 - Added dr_clobber_retaddr_after_read()
 - Added dr_get_string_option() and dr_get_integer_option() to support querying
   arbitrary DynamoRIO runtime options
 - Added support for building with Visual Studio 2010 and with MSBuild
 - Added instr_is_near_ubr() and instr_is_near_call_direct()
 - Added exported CMake cross-platform assembly support in
   cpp2asm_support.cmake and auxiliary files
 - Added get_DynamoRIO_defines() to DynamoRIOConfig.cmake
 - Added DR_EMIT_MUST_END_TRACE flag
 - Improved the performance of dr_safe_read() such that it out-performs
   DR_TRY_EXCEPT and no longer invokes a system call on Windows.
 - Added dr_redirect_native_target()
 - Added dr_mark_safe_to_suspend()
 - Added dr_mutex_mark_as_app(), dr_rwlock_mark_as_app(), and
   dr_recurlock_mark_as_app()
 - Added dr_get_main_module()
 - Added module import iterators dr_module_import_iterator_start(),
   dr_module_import_iterator_hasnext() dr_module_import_iterator_next(),
   dr_module_import_iterator_stop(), dr_symbol_import_iterator_start(),
   dr_symbol_import_iterator_hasnext(), dr_symbol_import_iterator_next(), and
   dr_symbol_import_iterator_stop().
 - Added DR_FAST_IR to allow clients to inline some key IR routines
 - Added -logdir runtime option for control over the log directory
 - Added drmgr_get_parent_cls_field()
 - Added support for building DynamoRIO with Visual Studio 2012 and
   the Windows 8 WDK
 - Added a new operand type enabling an instr_t to be used as a
   memory reference: opnd_create_mem_instr(), opnd_is_mem_instr(),
   opnd_get_mem_instr_disp()
 - Added DYNAMORIO_CONFIGDIR alternative to HOME as a config dir location.
   Additionally, drrun uses a temp dir for config files rather than failing.
 - Added library search path control via the client_basename.drpath file
 - Added drmgr_register_pre_syscall_event_ex()
 - Added DR_MEMPROT_GUARD for dr_memory_protect (Windows only).
 - Added dr_sscanf()
 - Added notifications on application faults and additional information
   on client faults
 - Added conversion between UTF-16 and UTF-8 to dr_snprintf() and
   dr_snwprintf()
 - Added simplified -c client argument form to drrun, drconfig, and drinject.
 - Added official support for the \ref op_speed "-opt_speed" option
   to prioritize speed over a simple code stream.
 - Added dr_atomic_add32_return_sum()
 - Deprecated dr_save_arith_flags() and dr_restore_arith_flags()
 - Fixed performance regression involving inlined clean calls
 - Fixed bug involving 32-bit Linux support on a 64-bit Linux
   kernel on an AVX-enabled processor (Issue 754)
 - Fixed bug involving multimedia state on a 32-bit Windows kernel
   (Issue 139)
 - Fixed bugs building and running on Ubuntu 11.10 (Issue 718, Issue 720)
 - Several other bug fixes
 - Added dr_raw_mem_alloc() and dr_raw_mem_free(). However, they are still
   experimental, are in flux, and are subject to change in the next release.

**************************************************
<hr>
The changes between version 3.2.0 and 3.1.0 are:

 - Added support for PECOFF + DWARF2 symbols on Windows in the
   drsyms Extension
 - Added support for building extensions as static libraries (subject to
   licensing constraints) via DR_EXT_{DRWRAP,DRUTIL,DRMGR,DRSYMS}_STATIC
 - Added support for linking C clients with libc via DynamoRIO_USE_LIBC
 - Added dr_insert_clean_call_ex()
 - Added a no-frills drwrap mode for faster but constrained wrapping
 - Added drwrap_get_drcontext() for performance
 - Added drwrap notification on exceptions bypassing post-hooks
 - Added drwrap_wrap_ex() to pass initial constant user data
 - Added drwrap_is_wrapped() and drwrap_is_post_wrap()
 - Added drwrap_set_global_flags() to control safety of
   application memory accesses
 - Added drwrap_get_mcontext_ex() to avoid the cost of copying
   multimedia register values when not necessary
 - Added drwrap interface for caching post-call addresses
 - Added drmgr_decode_sysnum_from_wrapper()
 - Added drutil_expand_rep_string_ex() that returns additional
   information about string loop expansion
 - Added improved instrlist disassembly that includes labels and
   instruction targets
 - Added instr_compute_address_ex_pos() for instrs with multiple memory
   operands.
 - Added dr_get_client_base()
 - Added dr_vsnprintf()
 - Added service pack version to dr_get_os_version()
 - Added mediation of note fields to drmgr
 - Added custom storage in label instructions via instr_get_label_data_area()
 - Added support for multiple non-meta control transfer instructions
   with intra-block targets in one basic block to drmgr
 - Added user data passing support among all four passes of drmgr
 - Several bug fixes

**************************************************
<hr>
Version 3.0.0 was a development version.  3.1.0 is the first official
released version of the 3.x series.

The changes between version 3.0.0 and 2.2.0 include the following major
features:

 - Added a private loader on Linux for better support for C++ clients and
   third-party library usage by clients
 - Added Linux support for \p drsyms to enable symbol processing in
   Linux clients
 - Added \p drutil Extension which provides memory address retrieval
   and string loop expansion (note: LGPL license)
 - Added a static library for decoding and encoding

\b IMPORTANT: The 3.0.0 and onward client API is mostly backward
compatible with releases from 1.0.0 (originally called 0.9.6: see below)
onward with the exception of functions that involve dr_mcontext_t and
several other source and binary compatibility changes since version 2.2.0
described below.  The dr_mcontext_t struct and all structs that contain it
have changed and are NOT backward compatible with releases prior to 3.0.0.

A sample script for updating client sources to the 3.0.0 API's version of
dr_mcontext_t and related functions is as follows:

\code
perl -pi -e '\
s|dr_mcontext_t (\w+);|dr_mcontext_t \1 = {sizeof(\1),DR_MC_ALL,};|;\
s|(dr_[gs]et_mcontext\(\S+,\s+\S+),\s+[^\s\)]+\)|\1)|;\
s|(dr_redirect_execution\(\S+),\s+\S+\)|\1)|;\
s|^\s+int app_errno;\s*\n||ms;\
s|raw_mcontext\.|raw_mcontext->|g;\
s|info->mcontext\.|info->mcontext->|g;\
s|excpt->mcontext\.|excpt->mcontext->|g;' *.c
\endcode

The script makes 3 main changes.  First, any dr_mcontext_t allocated by the
client must have its \p size and \p flags fields set.  Second, the \p app_errno
parameter was removed from several functions; it required a local variable,
so any local named \p app_errno is removed.  Third, the dr_mcontext_t
fields in the fault, signal, and exception structs all became
pointers.

This script may not catch all cases.  Use your version control system to
look at the diff after applying it to ensure it did not change anything it
shouldn't have.  Run with debug build to catch other instances where
dr_mcontext_t.size is not set.  Also note that using the dr_mcontext_t
initialization syntax in the script will end up calling memset; for
performance-critical situations, instead initialize only the size and flags
fields separately.  Also note that if the xmm or ymm registers are not
needed, asking for DR_MC_CONTROL and/or DR_MC_INTEGER is more performant
than DR_MC_ALL.

\b IMPORTANT: Further changes between version 3.0.0 and 2.2.0 include the following that
affect source and/or binary compatibilty:

 - Changed the #dr_mcontext_t structure field layout.  This is a binary
   compatibility change with respect to versions prior to 3.0.0.
 - Added a dr_mcontext_t.size field which must be set by the client prior
   to calling dr_get_mcontext(), dr_set_mcontext(), or
   dr_redirect_execution.  This is a source compatibility change with
   respect to versions prior to 3.0.0.
 - Added a dr_mcontext_t.flags field which must be set by the client prior
   to calling dr_get_mcontext(), dr_set_mcontext(), or
   dr_redirect_execution.  This is a source compatibility change with
   respect to versions prior to 3.0.0.
 - Removed the app_errno parameter from dr_get_mcontext(),
   dr_set_mcontext(), and dr_redirect_execution().  This is a source
   compatibility change with respect to versions prior to 3.0.0.
 - Changed all dr_mcontext_t fields in the dr_restore_state_info_t,
   dr_exception_t, and dr_siginfo_t structs to be pointers.  This is a
   source compatibility change with respect to versions prior to 3.0.0.
 - Changed the bool typedef from int to char for C++ compatibility.
   This is a binary compatibility change with respect to versions
   prior to 3.0.0.
 - Changed the signature of drwrap_unwrap(), in order to allow one of the
   pre or post hooks to be optional (Issue 562).  This is a source
   compatibility change with respect to versions prior to 3.0.0.
 - Moved console printing support from the drsyms Extension to core DR.  The
   drsym_write_to_console() and drsym_using_console() are no longer
   supported.  Instead, call dr_enable_console_printing() in dr_init(),
   which then enables dr_printf() and dr_fprintf() to print to the console
   (with some limitations: see dr_enable_console_printing() documentation).
   This is a source compatibility change with respect to versions
   prior to 3.0.0.
 - Added a \p flags argument to most of the routines in the \p drsyms extension
   to control demangling, and added drsym_demangle_symbol().  This is a source
   compatibility change with respect to versions prior to 3.0.0.
 - Added drsym_get_module_debug_kind() and a \p debug_kind field to the \p
   drsym_info_t struct written by drsym_lookup_address().  These additions allow
   drsyms users to determine what kind of debug info is available for a module.
   The \p debug_kind field creates a binary compatibility change for users of \p
   drsym_info_t with respect to versions prior to 3.0.0.

Additional changes between version 3.0.0 and 2.2.0 include the following:

 - Added \p drvector to drcontainers Extension: simple resizable vector
 - Added a windbg script for auto-locating libraries for easier
   debugging
 - Added dr_mutex_self_owns() and recursive lock support (dr_recurlock_*)
   (Issue 219)
 - Added dr_map_file(), dr_unmap_file(), and dr_file_size() (Issue 542)
 - Added dr_rename_file() and dr_delete_file().
 - Added routines to disassemble to a buffer rather than a file (Issue 524)
 - Added support for the AVX and FMA ISA extensions
 - Added dr_insert_get_seg_base()
 - Added return value to dr_redirect_execution() and dr_set_mcontext()
 - Increased maximum option string from 512 to 2048 (Issue 363)
 - Increased default stack size from 20KB to 56KB to make it easier to use
   C++ and external libraries with larger stack usage
 - Added dr_get_os_version() (Issue 304)
 - Deprecated the "meta-instruction that can fault" property and
   instr_is_meta_may_fault(), instr_set_meta_may_fault(),
   instrlist_meta_fault_preinsert(), instrlist_meta_fault_postinsert(),
   and instrlist_meta_fault_append().
 - Added dr_using_app_state()
 - Added instr_encode_to_copy() and instrlist_encode_to_copy()
 - Added disassemble_set_syntax() for -syntax_intel control without
   runtime options and proc_set_vendor() to control vendor-specific
   ISA details when decoding or encoding
 - Added instrlist_set_fall_through_target() and
   instrlist_set_return_target()
 - Added hashtable_clear() to the drcontainers Extension
 - Several bug fixes

**************************************************
<hr>
The changes between version 2.2.0 and 2.1.0 are:

 - Added \p drwrap Extension which provides function wrapping
   and replacing (note: LGPL license)
 - Added \p drmgr Extension: the DynamoRIO Multi-Instrumentation Manager
   Extension, a mediator for combining and coordinating multiple
   instrumentation passes
 - Added read-write locks (Issue 406)
 - Added isolation of client-opened files from the application (Issue 357)
 - Added dr_mcontext_t.xip for syscall events (Issue 442)
 - Several bug fixes

**************************************************
<hr>
The changes between version 2.1.0 and 2.0.0 are:

 - Added Windows 7 support
 - Added clean call sequence optimization and auto-inlining.
 - Added Windows child process following support for clients: -follow_children
   is now on by default for both Windows and Linux.
 - Added DR_TRY_EXCEPT() (Issue 51)
 - Added dynamic client auxiliary library loading support
   via dr_load_aux_library(), dr_lookup_aux_library_routine(), and
   dr_unload_aux_library()
 - Added dr_switch_to_app_state() and dr_switch_to_dr_state()
 - Added dr_client_thread_set_suspendable()
 - Added dr_get_random_value(), dr_set_random_seed(), and dr_get_random_seed()
 - Added dr_file_exists() and dr_directory_exists() for Linux
 - Added support for dr_get_mcontext() from secondary thread init events,
   and changed its return type to bool
 - Added dynamic hashtable resizing to the drcontainers hashtable
 - Added dr_app_pc_from_cache_pc()
 - Added a segment list to module_data_t for Linux and internal
   support for non-contiguously-mapped modules (Issue 160)
 - Added PEB isolation (Issue 249) and dr_get_app_PEB()
 - Added drsym_enumerate_symbols() to the \p drsyms Extension
 - Added limited support for printing to the cmd window (Issue 261) via the
   \p drsyms Extension: drsym_write_to_console() and drsym_using_console()
 - Renamed the REG_ constants to DR_REG_ to avoid conflicts with system
   headers (Issue 34).  Clients should set(DynamoRIO_REG_COMPATIBILITY ON)
   prior to configure_DynamoRIO_client() to use the old constants and avoid
   any source changes; this will happen automatically if the client
   targets version 2.0 or earlier.  Binary compatibility is unaffected.
 - Deprecated dr_request_synchronized_exit() and replaced it with
   dr_set_process_exit_behavior().  Now a full thread synch is performed
   at exit time in release build if a process exit event or thread exit
   event is registered.  dr_set_process_exit_behavior() can provide
   more performant exit performance for clients that have flexible
   exit event requirements.
 - Switched debug build to also be an INTERNAL=ON build
 - Fixed bug in handling single-byte-bb selfmod code
 - Fixed bugs in handling alarm signals
 - Fixed 64-bit Windows stack alignment bug (Issue 331)
 - Fixed handling of "data32 rex.w call"
 - Fixed Issue 320: a problem with thread-private cache resizing
 - Fixed Issue 319: decode movlhps and movhlps properly
 - Fixed Issue 139: add xmm0-7 preservation for 32-bit Linux applications,
   which may have noticeable impacts on clients calling clean calls:
   e.g., pushing bbs over the max size limit or having a noticeable
   performance hit.
 - Support building sources using Visual Studio

**************************************************
<hr>
In version 2.0.0, the configuration and deployment API and tools changed and
are not backward compatible with earlier versions: see below for details.
The changes between version 2.0.0 and 1.5.0 are:

 - Changed the configuration and deployment model for both Linux and
   Windows to use a configuration file based approach on both platforms,
   which adds control over child processes on Linux and supports local
   configuration on Windows for un-privileged and parallel execution
   (Issue 265).  The registry is no longer used for individual application
   configuration on Windows other than to point at the location for
   global configuration files, when used.<br>
   \b IMPORTANT: On Windows the following non-backward-compatible changes
   have been made:
   - drdeploy.exe no longer exists (replaced by drconfig.exe and drrun.exe)
   - drconfig.dll is now drconfiglib.dll
   - drconfiglib.dll's API routines now take in a process id to support
     one-time targeted-process configuration (to support parallel execution)
   - configuration is either per-user or global, with per-user taking
     precedence when both exist
   - configuration does NOT enable systemwide injection by default:
     use the -syswide_on parameter to drconfig or drrun for that
     (it requires administrative privileges)
   .
   \b IMPORTANT: On Linux, if you're using custom injection via
   raw environment variables rather than using the \p drdeploy script,
   you must also set DYNAMORIO_RUNUNDER to 1 for injection to work with
   this release.
 - Added drinjectlib.dll and dr_inject.h, making custom injection tools
   easier to build (Issue 246)
 - Added DynamoRIO Extension support for auxiliary libraries that extend the
   DynamoRIO API (Issue 277)
 - Added symbol lookup support via Extension (Windows only for now) (Issue 44)
 - Added a "drcontainers" Extension that initially contains a hashtable
 - Added thread creation support: dr_create_client_thread() (Issue 41)
 - Added dr_sleep()
 - Added dr_set_itimer() and dr_get_itimer() (Linux-only) (Issue 283)
 - Added dr_app_pc_for_decoding()
 - Added -synch_at_exit option and dr_request_synchronized_exit() to
   provide guarantees over thread exit event timing in release build
 - Added instr_cmovcc_triggered() and instr_cmovcc_to_jcc()
 - Renamed OP_fcmovene to OP_fcmovne
 - Implemented instr_invert_cbr() for OP_jcc_short
 - Added the full path to modules in module_data_t
 - Added dr_get_proc_address_ex() to support indirect code objects
 - Added dr_get_milliseconds() and dr_get_time() impl for Linux
 - Added instr_is_undefined()

**************************************************
<hr>
The changes between version 1.5.0 and 1.4.0 are:

 - Added a private loader on Windows for better support for library usage
   by clients
 - Added nudge support on Linux
 - Added dr_suspend_all_other_threads() and dr_resume_all_other_threads()
 - Made it easier for clients to use faults to push rare events out of
   instrumentation paths:
   - Added access to the pre-translated context and the code fragment
     information for both
     dr_register_signal_event() and dr_register_exception_event()
     This changed the return type for exception event callbacks.
   - Added a signal/exception event on a fault in non-code-cache
     DynamoRIO code, such as client-generated code.
   - Added the "meta-instruction that can fault" property via
     instr_is_meta_may_fault(), instr_set_meta_may_fault(),
     instrlist_meta_fault_preinsert(), instrlist_meta_fault_postinsert(),
     and instrlist_meta_fault_append().
   - Added a new event dr_register_restore_state_ex_event() that provides
     the pre-translated context and code fragment information, and allows
     for translation failure for non-fault translations.
 - Added dr_dup_file_handle()
 - Added dr_memory_is_dr_internal() and dr_memory_is_in_client()
 - Added dr_get_parent_id()
 - Added decode_opcode_name()
 - Removed the deprecated snprintf() as it causes symbol pre-emption
   problems on Linux.  Older clients should switch to dr_snprintf().
 - Fixed bug in cross-architecture execve (Issue 146)
 - Clone record is now passed via dstack instead of ebp (Issue 149)
 - Fixed close() syscall handling, !HAVE_TLS assert & minor issues (Issue 151)

**************************************************
<hr>
The changes between version 1.4.0 and 1.3.2 are:

 - Added directly-addressable thread-local storage slots for exclusive
   client use:
   - dr_raw_tls_calloc()
   - dr_raw_tls_cfree()
 - Provide 64-bit versions of the drdeploy.exe and drview.exe tools
 - Provide dr_get_proc_address() on Linux
 - Added dr_query_memory_ex() to allow address space walking on Linux
 - Added -msgbox_mask on Linux: waits for a keypress
   - Added STDIN and dr_get_stdin_file()
 - Added shared library versioning on Linux
 - Support calling dr_get_mcontext() from bb and trace callbacks
 - Provide support for building clients using CMake (see cmake/, and for
   an example of usage see samples/CMakeLists.txt)
 - Provide support for clients to use -fvisibility by setting
   the define USE_VISIBILITY_ATTRIBUTES for dr_defines.h
 - Added instr_compute_address_ex() for instrs with multiple memory operands
 - Provide dr_snprintf() (identical to snprintf()) for consistent naming
   and to avoid gcc warnings about using pointers with %x (which we're
   using because there is no portable way to precisely control %p)
 - The statistics viewer \c DRgui.exe is no longer supported on Windows
   NT.  Statistics still work, but the graphical application itself will
   not run on NT.
 - Changed the top-level registry key to "DynamoRIO"
 - Re-arranged layout of bin and samples directories
 - Symbols for all binaries are now included

**************************************************
<hr>
The changes between version 1.3.2 and 1.3.1 are:

 - Added support for Linux execve of cross-architectural executables
   (e.g., 32-bit process performing execve of 64-bit executable)
   - Also, libdrpreload.so is now kept in the same libXX/{debug,release}
     directory as libdynamorio.so
 - instr_convert_short_meta_jmp_to_long() now returns the longer version of
   the taken jump, to use when setting the target of a jecxz or loop*
   branch.
 - Various bug fixes including in these areas:
   - dr_syscall_set_result() and dr_syscall_invoke_another()
   - 64-bit drinject stack alignment
   - 64-bit erroneous assert in dr_get_process_id()
   - 64-bit dr_file_{tell,seek} worked but returned failure
   - -opt_memory bugs resulting in asserts
   - sigprocmask() corner case bug
   - signal handler sharing for NPTL threads
   - decoding across page boundaries on Linux

**************************************************
<hr>
Version 1.3.1 is identical to 1.3.0 but is under a BSD license (see \ref
page_license).

We re-numbered the previous DynamoRIO versions as follows:

 - 1.0.0 = 0.9.6 build 9600
 - 1.1.0 = 0.9.6 build 9601
 - 1.2.0 = 0.9.6 build 9602

**************************************************
<hr>
The changes between version 1.3.0 and version 1.2.0 (0.9.6 9602) are:

 - Version numbering shift to 1.x.y instead of 0.9.6 960x
 - New system call pre, post, and filter events, and new system call
   parameter and result access, along with a feature to chain system calls:
   - dr_register_pre_syscall_event()
   - dr_register_post_syscall_event()
   - dr_register_filter_syscall_event()
   - dr_syscall_get_param()
   - dr_syscall_set_param()
   - dr_syscall_set_sysnum()
   - dr_syscall_get_result()
   - dr_syscall_set_result()
   - dr_syscall_invoke_another()
   - dr_is_wow64()
 - New signal event for Linux
   - dr_register_signal_event()
 - New option \ref op_pause "-pause_on_error", and error messages to
   stdout by default for release builds, to improve Linux debugging
 - New routines for memory allocation and memory manipulation:
   - dr_nonheap_alloc()
   - dr_nonheap_free()
   - dr_memory_protect()
 - New option \ref op_syntax_intel "-syntax_intel" for Intel-style disassembly
 - New option \ref op_sysenter "-sysenter_is_int80"
 - The parameter to an application's system call (normally kept in the eax
   register) can now be freely changed in basic blocks on all platforms
 - Added support for 64-bit -thread_private
 - Added corner-case undocumented IA-32 opcode support
 - Fixed bug running multi-threaded 64-bit Linux apps
 - Fixed bugs in 64-bit Linux signal handling
 - Fixed bug running -thread_private debug build
 - Fixed bug running 32-bit apps on 64-bit Linux on AMD processors
 - Fixed bug where OS_OPEN_APPEND overwrote instead of appending on Windows

**************************************************
<hr>
The changes between the 0.9.6 release builds 9602 and 9601 are:

 - Performance improvements for both the base DynamoRIO system and for
   client instrumentation when running on Pentium M, Core, and Core 2
   processors.
 - 64-bit bug fixes
 - Added several convenience routines:
   - get_register_name()
   - reg_to_pointer_sized()
   - reg_is_gpr()
   - reg_is_segment()
   - reg_32_to_8()
 - Disassembly now expands immed sizes to match operands
 - Fixed bug in instr_is_nop()

**************************************************
<hr>
The changes between the 0.9.6 release builds 9601 and 9600 are:

 - The Windows registry key used is now "VMware, Inc." instead of "VMware"
 - Added large file support (see #DR_FILE_ALLOW_LARGE)
 - Added support for decoding from a copy of code: decode_from_copy() and
   disassemble_from_copy().
 - Changed the default options to favor performance, and added the
   \ref op_memory "-opt_memory" runtime option to prioritize memory instead.

Release 0.9.6 is \b not backward compatible with prior releases 0.9.1-0.9.5.

The major changes between the 0.9.6 and 0.9.5 releases include 64-bit
support, multiple clients, state translation, trace contents, and Linux
module events and fast system calls:

 - 64-bit applications and clients are now supported.  This changed
   several function signatures:
   - instr_encode()
   - decode_next_pc()
   - decode_sizeof()
   - decode_eflags_usage()
   - instr_init()
   - The binary trace dump format changed.
   .
   Several new functions were added:
   - set_x86_mode()
   - get_x86_mode()
   - instr_set_x86_mode()
   - instr_get_x86_mode()
   - opnd_create_rel_addr()
   - opnd_create_far_rel_addr()
   - opnd_is_rel_addr()
   - opnd_is_near_rel_addr()
   - opnd_is_far_rel_addr()
   - instr_has_rel_addr_reference()
   - instr_get_rel_addr_target()
   - instr_get_rel_addr_dst_idx()
   - instr_get_rel_addr_src_idx()
   - instr_shrink_to_32_bits()
   - opnd_shrink_to_32_bits()
   - reg_32_to_64()
   - reg_64_to_32()
   - reg_is_extended()
   - reg_parameter_num()
   .
   To build a 64-bit client, set the \p X86_64 preprocessor define before
   including the DynamoRIO header files, and link with the 64-bit build of
   DynamoRIO (for a 32-bit client, set \p X86_32).
 - Multiple clients are now supported.  This changed the signatures of
   dr_init(), dr_get_options(), and dr_get_client_path().  It also changed
   how clients are deployed and nudged, and how events are unregistered:
   explicit unregistration routines are now used.
 - State translation in the presence of clients is now fully supported.
   This changed the signature for the basic block and trace event callbacks
   (see dr_register_bb_event() and dr_register_trace_event()), added a
   new event dr_register_restore_state_event(), and added new functions
   instr_set_translation(), instr_set_meta_no_translation(), and INSTR_XL8().
 - The trace callback (#dr_register_trace_event()) now presents original
   application code to the client, rather than code that has already
   been modified for execution in the code cache.  The client also has
   flexibility in which instrumentation is included from constituent
   basic blocks added to a trace (the \p for_trace parameter: see
   #dr_register_bb_event()).
 - Fast system calls (syscall and sysenter) are now supported on Linux.
 - Module load/unload events and module iteration are now supported on Linux.
 - System calls for 32-bit applications on 64-bit kernels are no longer
   hidden by vsyscall; related functions were removed:
   instr_is_lol64_syscall(), instr_is_32on64_syscall().
 - Due to both 64-bit support and full WOW64 (32-bit applications on 64-bit
   Windows) support, xmm registers were added to dr_mcontext_t, and a
   new function dr_mcontext_xmm_fields_valid() was added.
 - Far instr-type operands are now supported: opnd_create_far_instr(),
   opnd_is_near_instr(), opnd_is_far_instr().
 - Miscellaneous new functions were added:
   - instr_convert_short_meta_jmp_to_long()
   - instr_reads_from_reg()
   - LOCK()
   - OPND_CREATE_INT_32OR8()
   - OPND_CREATE_INT_16OR8()
   - instrlist_meta_append()
   - dr_using_all_private_caches()
 - The type of nudge arguments was changed from (void *) to uint64.
 - The signature of dr_lookup_module() changed.  It no longer has an
   IMAGE_SECTION_HEADER out argument.  See dr_lookup_module_section()
   for that functionality.
 - The disassemble-from-address routines now return NULL when pointed at
   invalid instructions (matching the decode routines).
 - The routines to access DynamoRIO tls slots from the cache were changed.
   dr_insert_write_temp_tls was eliminated in favor of a generalized #dr_save_reg
   with more flexibility on which slot can be used.  #dr_save_arith_flags was
   similarly generalized.  Slots are now guaranteed to remain valid until the
   next non-meta instruction allowing access to saved registers during clean
   calls via #dr_read_saved_reg and #dr_write_saved_reg.  #dr_insert_mbr_instrumentation
   also now requires caller to specify the spill slot to be clobbered
   which must be less than dr_max_opnd_accessible_spill_slot().

**************************************************
<hr>
The major changes between the 0.9.5 and 0.9.4 releases are:

 - The basic block hook (\ref sec_events_bb) passes completely unmodified
   application code to the client (no mangling or elision).
 - The old client hook exports have been replaced with an explicit event
   registration model.
 - Instruction representation simplification: the client only sees fully
   decoded instructions.
 - Easier-to-use clean calls (see #dr_insert_clean_call).
 - Library support (-wrap on linux, ntdll on windows: see \ref sec_extlibs
   and \ref sec_utils).
 - Some features have been removed (these are easily implemented by a
   client): there is no more edge-counting profile build, no more
   custom exit stubs, and no more prefixes.
 - Infrastructure improvements:
   - Thread-shared caches (can still request thread-private: \ref
     op_thread_priv "-thread_private option").  Note that there are
     some subtle changes stemming from using thread-shared: in particular,
     note that the context passed to the deletion event may be NULL
     (see #dr_register_delete_event).
   - Direct access to TLS slots (#dr_save_reg, dr_insert_write_temp_tls,
     #dr_insert_write_tls_field).
 - Module events (#dr_register_module_load_event),
   module iteration (#dr_module_iterator_start, #dr_lookup_module, etc.),
   and memory querying (#dr_query_memory, #dr_virtual_query).
 - The full API is now documented in html and pdf for easy browsing.
 - Numerous type and routine name changes.

\endif


***************************************************************************
\htmlonly
<table width=100% bgcolor="#000000" cellspacing=0 cellpadding=2 border=0>
  <tr><td><table width=100% bgcolor="#0000C0" cellspacing=0 cellpadding=1 border=0>
  <tr><td><table width=100% bgcolor="#0000C0" cellspacing=0 cellpadding=1 border=0>
  <tr><td></td></tr></table></td></tr></table></td></tr></table>
\endhtmlonly
\section sec_limits Limitations

\subsection sec_limit_clients Client Limitations
The most important limitation on a client is that it remain transparent.
This is described fully in \ref transparency.
Here we summarize the key points to remain transparent:

  - For full transparency, the client should be a self-contained library
with linkage to nothing other than DynamoRIO libraries.  We
provide private loading that makes some use of system libraries safe, but
global resource conflicts can still occur and clients are cautioned from
using system-interacting library routines.
See \ref sec_extlibs for further details.
  - Currently, the communication API provided by DynamoRIO is limited to file
I/O and nudges.
\if vmsafe
  - The security agent on the security monitor VM has no direct
    relationship with DynamoRIO.  However, the VMsafe solution provider
    can architect their own communication channel between the security
    agent on the security monitor VM and the client by using an agent on
    the client's VM as an intermediary.
 \anchor limits_winlogon
  - There is a known false positive in the anti-piracy DRM code in the
    Windows Genuine Advantage component of winlogon.exe.  This code
    performs deliberate obfuscation and violations of standard coding
    behavior.
\endif
\if vmsafe
  - The client can run in only one mode at a time, which cannot be changed during the
execution of the process.  Mode change can be done only on a subsequent
application restart.
  - The client should call only the API corresponding to the mode it was started
in.  Mixing API from different modes can lead to unspecified results and is
not supported.
  - Probe API allows only one registration of probes, which must occur in
    dr_init().
  - Probes can be specified only with library names and offsets from the base
    of the library in memory (\ref DR_PROBE_ADDR_LIB_OFFS).
  - When a probe callback finishes execution it can't request DynamoRIO to
    perform any actions like logging, control flow changes, etc.
  - Probe locations can't include system call wrappers in ntdll.dll, i.e.,
    ntdll!Nt* routines can't be probe locations.
\endif

\subsection sec_limit_platforms Platform Limitations
  - This version of DynamoRIO supports Windows 8 and 8.1.
    However, systemwide injection (-syswide_on) is not yet supported on
    Windows 8 or 8.1.
  - DynamoRIO currently supports the following NT-based 32-bit
    Windows systems: XP (32-bit, service packs 0-3), 2003 (32-bit, service
    packs 0-2), Vista (32-bit, service packs 0-1),
    Windows 7 (32-bit, service packs 0-1), Windows 8, and Windows 8.1.
    It does not support Windows 95, 98, or ME.
    It no longer officially supports NT (all service packs) or 2000 (all service
    packs), although the core DynamoRIO library should still work there: it
    is only the tools and utility programs that will fail to run.
    Windows Server 2008 is expected to work but has not
    been tested.
  - This release of DynamoRIO supports running 32-bit
    Windows applications on the following 64-bit Windows operating
    systems: Windows XP Professional x64 (service pack 2), Windows 2003
    x64 (service pack 2), Vista x64 (service packs 0-1), Windows 7
    (service packs 0-1), Windows Server 2008, Windows 8, and Windows 8.1.
    Only the 32-bit
    code will be seen, and child processes created will not be injected
    into.  On 64-bit Windows 32-bit applications are automatically run
    through the Windows-On-Windows or WOW64 emulator so system call and
    indirect call processing clients must be aware of
    #instr_is_wow64_syscall().
\anchor limits_64bit
  - This release of DynamoRIO supports running
    64-bit Windows applications, using the 64-bit DynamoRIO build, on
    the following 64-bit Windows systems: Windows XP Professional x64
    (service pack 2), Windows 2003
    x64 (service pack 2), Vista x64 (service packs 0-1), Windows 7 x64
    (service packs 0-1), Windows 8, and Windows 8.1.
    Windows Server 2008 is expected to work but has not
    been tested.
  - DynamoRIO does not support any Itanium based Windows systems.
  - This release does not fully support applications that mix 32-bit and
    64-bit code.  Future releases will support such mixtures.
  - When running a cygwin application under control of DynamoRIO,
    stderr and stdout output from DynamoRIO or its clients may not
    be visible.
  - UTF-8 support is not yet present in drinjectlib, drconfiglib,
    drrun.exe, drconfig.exe, or drdeploy.exe.  It is present in the
    core DR API.
  - This release of DynamoRIO has support for most 32-bit and
    64-bit Linux
    distributions running on Intel-compatible hardware, including
    Ubuntu and Fedora.
  - This release of DynamoRIO has support for running 32-bit
    Linux applications on 64-bit Linux operating systems on
    AMD64-compatible hardware.
  - Cross-architecture execve (e.g., a 32-bit process performing execve of
    a 64-bit executable) may stop working if the paths to the
    libdynamorio.so and libdrpreload.so libraries are renamed.

\subsection sec_limit_perf Performance Limitations

  - In order to present a more straightforward code stream to clients,
    DynamoRIO has several optimizations disabled in this release.
    System-call-heavy applications are the ones most likely to be affected.
    Future releases may allow clients to choose performance versus
    visibility.  This release does provide the \ref op_memory "-opt_memory option"
    to enable prioritizing memory usage and the \ref op_speed "-opt_speed option"
    to prioritize performance at the cost of more complex basic blocks that
    cross control transfers.
  - The performance \if vmsafe of Code Manipulation Mode and Memory
    Firewall Mode \endif when starting up large desktop applications
    may be noticeably worse than native.  Upcoming releases will
    address this issue. \if vmsafe Note that Probe Mode incurs
    significantly less overhead than the other modes. \endif
  - The performance \if vmsafe of Code Manipulation Mode \endif when
    running  Java, .Net, Flash or similar managed execution
    applications can be noticeably worse then native.  This can
    include applications that load these components as in-process
    plugins (such as Internet Explorer). Upcoming releases will
    address this issue.  \if vmsafe Probe Mode and Memory Firewall
    Mode are not affected. \endif
  - When using \if vmsafe Code Manipulation Mode or Memory Firewall
    Mode \else DynamoRIO \endif on all or many processes on a system
    simultaneously, memory usage may become a factor.  Upcoming
    releases will address this issue.  \if vmsafe Note that Probe Mode
    incurs significantly less overhead than the other modes. \endif

\subsection sec_limit_deploy Deployment Limitations

  - The dr_config.lib library is not multi-thread safe.  Users of the
    library should ensure that no more then one thread accesses the
    library at a time.
  - Other installed software that uses hooks may not always be
    interoperable with DynamoRIO.
  - Other installed software may conflict with DynamoRIO's use of the
    \c \\HKLM\\SOFTWARE\\Microsoft\\Windows\\WindowsNT\\CurrentVersion\\AppInit_DLLs
    registry key (only very rarely an issue), which is used for
    the -syswide_on feature.
  - On Windows 7 and Windows Server 2008 R2, the digital signature
    requirement for AppInit_DLLs libraries is disabled when systemwide
    injection is requested (-syswide_on).  This can be a security concern.
  - On Windows 8 or 8.1, system wide injection (-syswide_on) is not yet supported.
  - Cygwin processes may not work with DynamoRIO due to cygwin's
    implementation of fork being incompatible with DynamoRIO.
  - A Windows application that does not statically link with
    user32.dll will not be run under control of DynamoRIO using
    system-wide injection unless its
    parent process (typically cmd.exe or explorer.exe, for manually
    launched applications) is already under DynamoRIO control
    \if vmsafe (the parent can be in any mode)\endif. Only some small
    non-graphical applications do not link with user32.dll.
  - When invoking an application in any way that is not from a parent
    process under DynamoRIO control, DynamoRIO takes control a little
    later and in some rare cases the application has already created a new
    thread.  This is in violation of the Windows specficiations, but cygwin
    processes do this.  This new thread will not be under DynamoRIO
    control and can cause a variety of problems.  In such cases it is best
    to invoke from a parent process under DynamoRIO control.  However, for
    32-bit applications on 64-bit Windows operating systems, DynamoRIO
    takes over later even from the parent.  Future releases will address
    this limitation.
  - This release does not support running some Windows services under
    control of DynamoRIO: the "System" process, smss.exe, csrss.exe, and protected
    processes on Windows Vista.
\anchor limits_vista_service_messagebox
  - On Windows Vista most services are run in a separate session as a
    security feature.  This means that neither DynamoRIO nor its
    client will be able to display a messagebox when running in said
    services (they have no associated visible window station). See
    dr_messagebox().
  - On Windows Vista \if vmsafe in Code Manipulation Mode \endif the code from
    certain dlls (found mostly in services) and the code subsequently
    called from those dlls is run natively and is not visible to the
    instrumentation APIs.  This only applies to dlls that have a .pexe
    section (only 13 dlls have such a section in a standard Vista
    install) which seems to be associated with a likely obfuscation
    method involving kernel side components that this release has no
    other workaround for.
\anchor limits_linux_preload
  - On Linux, the official deployment method in this release (aside
    from the \ref sec_startstop "app_start() app_stop()" interface, which
    requires soure code modification) is LD_PRELOAD.  This method does not
    support static binaries, but an experimental injection method which can
    be enabled with the \p -early flag does.  Binaries with the suid
    or sgid permission bits set
    disallow absolute paths in LD_PRELOAD and ignore LD_LIBRARY_PATH, so
    alternate methods of specifying the path are needed there.  One method
    is to place libdrpreload.so's full path in /etc/ld.so.preload and copy
    libdynamorio.so to /usr/lib or some other system search directory.
    You'll need to use a \ref lin_deploy "separate configure step approach".
    Don't forget to run drconfig to create a configuration for the
    application first; otherwise, libdrpreload.so will refuse to take
    control.
  - On Linux, the private loader will fail to load libpthread.so.  Therefore
    clients and the libraries they use cannot link against libpthread.so.

\ifnot vmsafe
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\section sec_future Plans for Future Releases

We hope to include the following major features in future releases:

 - Libraries to facilitate building tools that use shadow memory, examine
   system calls, and insert heavyweight instrumentation
 - Earliest Windows injection.  Today drinject injects fairly late; from a
   parent process, injection is very early (before kernel32.dll is loaded),
   but we plan to provide injection at the very first user-mode instruction
   in the future.
 - More flexible (earlier, or later via attach) Linux injection
 - Persistent and process-shared code caches
 - Full control over trace building

To discuss current and future features, join the <a
href="http://groups.google.com/group/dynamorio-users/">DynamoRIO Users
group</a>.

\endif

*/