[PATCH v11 1/3] Initial support for LuaJIT scripting

[Victor Krapivensky]

On Sat, Aug 26, 2017 at 12:58:48PM +0300, Dmitry V. Levin wrote:
> On Tue, Aug 15, 2017 at 01:09:23AM +0300, Victor Krapivensky wrote:
> > * .gitignore: Add luajit_lib.h.
> > * Makefile.am: Build with LuaJIT if configured so.
> > (strace_SOURCES): Add defs_shared.h, ffi.h.
> > (luajit_lib.h): Auto-generate from luajit_lib.lua.
> > * basic_filters.c (make_number_set_universal, is_number_set_universal):
> > New functions.
> > (syscall_classes): Make global and terminate wit a null entry.
> > (lookup_class): Use global syscall_classes.
> > * configure.ac: Add new --with-luajit configure option.
> > * defs.h (struct inject_opts): Move inject values to...
> > (struct inject_values): ...new struct.
> > (TCB_AD_HOC_INJECT, TCB_HOOK): New TCB flags.
> > (QUAL_HOOK_ENTRY, QUAL_HOOK_EXIT): New qual flags.
> > (RVAL_HOOKED): New return value flag.
> > (struct tcb): If built with LuaJIT support, include currpers field even
> > if SUPPORTED_PERSONALITIES is 1.
> > If built with LuaJIT support, include new ad_hoc_inject_vals field.
> > Move definitions that need to be fed to LuaJIT's FFI to...
> > * defs_shared.h: ...new file.
> > * ffi.h: New file.
> > * luajit.h: Likewise.
> > * luajit_lib.lua: Likewise.
> > * filter_qualify.c: (hook_entry_set, hook_exit_set): New sets (if built
> > with LuaJIT support).
> > (parse_inject_token, qualify_inject_common): Update for new layout of
> > struct inject_opts.
> > (set_hook_qual, set_hook_qual_all): New functions (if built with LuaJIT
> > support).
> > (qual_flags): If built with LuaJIT support, return QUAL_HOOK_ENTRY and
> > QUAL_HOOK_EXIT flags.
> > * strace.1 (LUA SCRIPTING): New section.
> > * strace.c (alloctcb): update the condition of presence of currpers
> > field.
> > (init): New -l option (if built with LuaJIT support).
> > (enum trace_event): New TE_SYSCALL_STOP_HOOK_EXIT entry.
> > (enum hook_state): New enum.
> > (trace_syscall): Introduce state argument.
> > (dispatch_event): Introduce hooked argument, support
> > TE_SYSCALL_STOP_HOOK_EXIT as first argument.
> > (main): run Lua script, if built with LuaJIT support and a script
> > was provided.
> > * syscall.c (errnoent_vec, nerrnoent_vec, signalent_vec,
> > nsignalent_vec, ioctlent_vec, nioctlent_vec, personality_wordsize,
> > personality_klongsize): New global variables.
> > (personality_names): New global variable (if SUPPORTED_PERSONALITIES >
> > 1).
> > (update_personality): use personality_names for reporting personality
> > name.
> > (tcb_inject_opts): Introduce step argument, change return type to struct
> > inject_values, rename to tcb_inject_values.
> > If built with LuaJIT support and TCB_AD_HOC_INJECT flag is set, blend
> > the result with tcp's ad_hoc_inject_vals.
> > (tamper_with_syscall_entering): Don't copy inject_vec here and do
> > counter decrement logic here; pass true as a second argument to
> > tcb_inject_values.
> > (tamper_with_syscall_exiting): Pass false as a second argument to
> > tcb_inject_values.
> > (syscall_ad_hoc_inject): New function.
> > (syscall_entering_trace): perform ad hoc injection even if the syscall
> > is not traced.
> > (syscall_exiting_decode): don't return 0 ("bail out") if exiting hook is
> > set up for this syscall, or if an ad hoc injection was performed.
> > Call tamper_with_syscall_exiting on success.
> > (syscall_exiting_trace): Don't call tamper_with_syscall_exiting, check
> > if the syscall is not traced again.
> > (syscall_exiting_finish): Clear TCB_AD_HOC_INJECT bit.
> > * sysent.h: Modify to support inclusion with FFI_CDEF.
> > ---
> >  .gitignore       |   1 +
> >  Makefile.am      |  17 ++
> >  basic_filters.c  |  84 ++++---
> >  configure.ac     |  36 +++
> >  defs.h           |  73 +++---
> >  defs_shared.h    |  66 +++++
> >  ffi.h            |  19 ++
> >  filter_qualify.c |  57 ++++-
> >  luajit.h         | 311 ++++++++++++++++++++++++
> >  luajit_lib.lua   | 383 +++++++++++++++++++++++++++++
> >  strace.1         | 724 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
> >  strace.c         |  95 ++++++--
> >  syscall.c        | 234 +++++++++++++-----
> >  sysent.h         |  24 +-
> >  14 files changed, 1961 insertions(+), 163 deletions(-)
> >  create mode 100644 defs_shared.h
> >  create mode 100644 ffi.h
> >  create mode 100644 luajit.h
> >  create mode 100644 luajit_lib.lua
> 
> Could you split this huge patch into two parts, please,
> the first one with preparatory changes that introduce no luajit support,
> and the second one with all the rest?

There are too many things dependant on USE_LUAJIT in this commit, I'm
not quite sure what exactly I should factor out to the first commit.