[SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-1.0-403-gea549ff

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- Log -----------------------------------------------------------------
commit ea549ffc2915aa58861637472b12196222673fa2
Author: Mark Wielaard <mjw@redhat.com>
Date:   Mon Dec 21 13:02:19 2009 +0100

    PR11015 Support shared library reloading (in different processes)
    
    * runtime/task_finder_vma.c (stap_remove_vma_map_info): Return negative
      status on failure.
      (stap_find_vma_map_info): Likewise.
      (stap_find_vma_map_info_user): New function.
      (stap_drop_vma_maps): New function.
    * runtime/sym.h (addr): Renamed to static_addr, to store addresses for
      sections which are always mapped at the same address.
      (_stp_module_relocate): Add extra struct task_struct *tsk argument.
    * runtime/sym.c (_stp_tf_exec_cb): New callback, calls stap_drop_vma_maps.
      (_stp_tf_mmap_cb): Don't store address in module.section, but call
      stap_add_vma_map_info() per tsk->group_leader for matched module.
      Don't register empty/null modules.
      (_stp_module_relocate): Take extra struct task_struct *tsk argument,
      cache last tsk used. Only use section->static_addr for none dynamic
      modules. Use stap_find_vma_map_info_user() to locate dynamic modules.
      (_stp_mod_sec_lookup): Add extra argument unsigned long *rel_addr to
      optionally store relative address when module/section found.
      (_stp_kallsyms_lookup): Use _stp_mod_sec_lookup to find relative address.
      (_stp_sym_init): Register _stp_tf_exec_cb in stap_task_finder_target.
      Add error check to see if task finder could be initialized.
    * dwflpp.cxx (emit_address): Pass NULL for kernel/modules and current for
      user tasks to _stp_module_relocate.
    * runtime/transport/symbols.c (_stp_do_relocation): Set new static_addr
      _stp_section field.
    * runtime/unwind.c (adjustStartLoc): Take new struct task_struct *tsk
      argument and pass to stap_find_vma_map_info_user and _stp_module_relocate
      to find adjusted addr.
      (_stp_search_unwind_hdr): Pass through struct task_struct *tsk.
      (unwind_frame): Likewise.
    * tapset/context-symbols.stp (probemod): Add NULL to _stp_mod_sec_lookup
      call to indicate we aren't interested in relative address.
    * tapsets.cxx (dwarf_derived_probe_group::emit_module_init): Pass NULL to
      _stp_module_relocate to indicate kernel/module address.

-----------------------------------------------------------------------

Summary of changes:
 dwflpp.cxx                  |    6 +-
 runtime/sym.c               |  167 ++++++++++++++++++++++++++++---------------
 runtime/sym.h               |    7 ++-
 runtime/task_finder_vma.c   |   71 +++++++++++++++++-
 runtime/transport/symbols.c |    2 +-
 runtime/unwind.c            |   31 +++++----
 tapset/context-symbols.stp  |    4 +-
 tapsets.cxx                 |    2 +-
 8 files changed, 207 insertions(+), 83 deletions(-)


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