[SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-1.2-424-g97cd933

[mark at sourceware dot org]

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- Log -----------------------------------------------------------------
commit 97cd9334da211ad573fa65d4fde61642f877af29
Author: Mark Wielaard <mjw@redhat.com>
Date:   Wed Jul 7 13:25:47 2010 +0200

    Keep track of context pt_regs state to distinquish between user/kernel regs.
    
    Although user_mode(regs) can give us a hint as to where the regs are
    coming from, it is more reliably to let the probe handler keep track.
    All utrace/uprobes based handlers now explicitly set CONTEXT->regflags
    _STP_REGS_USER_FLAG. As do the timer probes (based on user_mode).
    The perf based handlers don't yet try to determine the regs origin
    (but might just use the timer based heuristic). Relevant symbol/unwind
    tapset functions now take advantage of this new context flag. The register
    tapsets might also benefit from the extra info, but have not been adjusted.
    
    * translate.cxx (c_unparser::emit_common_header): Define _STP_REGS_USER_FLAG
      and add regflags field to struct context.
    * tapset-itrace.cxx (itrace_derived_probe_group::emit_module_decls):
      Set _STP_REGS_USER_FLAG for regflags.
    * tapset-perfmon.cxx (perf_derived_probe_group::emit_module_decls):
      Add XXX note to investigate.
    * tapset-timers.cxx (profile_derived_probe_group::emit_module_decls):
      Set _STP_REGS_USER_FLAG for regflags based on user_mode.
    * tapset-utrace.cxx (utrace_derived_probe_group::emit_module_decls):
      Set _STP_REGS_USER_FLAG for regflags.
    * tapsets.cxx (common_probe_entryfn_prologue): Initialize regflags to zero.
      (uprobe_derived_probe_group::emit_module_decls):
      Set _STP_REGS_USER_FLAG for regflags.
    * tapset/context-symbols.stp (probefunc): Check CONTEXT->regflags and use
      current task lookup if set.
      (probemod): Check CONTEXT->regflags _STP_REGS_USER_FLAG isn't set.
    * tapset/context-unwind.stp (print_backtrace): Likewise.
      (sprint_backtrace): Likewise.
      (backtrace): Likewise.
    * tapset/context.stp (user_mode): Just check CONTEXT->regflags.
    * tapset/ucontext-unwind.stp (print_ubacktrace): Check CONTEXT->regflags
      _STP_REGS_USER_FLAG is set.
      (sprint_ubacktrace): Likewise.
      (print_ubacktrace_brief): Likewise.
      (ubacktrace): Likewise.
    * tapset/utrace.stp (_utrace_syscall_nr): Likewise.
      (_utrace_syscall_arg): Likewise.
      (_utrace_syscall_return): Likewise.

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

Summary of changes:
 tapset-itrace.cxx          |    1 +
 tapset-perfmon.cxx         |    2 ++
 tapset-timers.cxx          |    3 +++
 tapset-utrace.cxx          |    1 +
 tapset/context-symbols.stp |   12 +++++++-----
 tapset/context-unwind.stp  |    6 +++---
 tapset/context.stp         |    8 ++------
 tapset/ucontext-unwind.stp |   28 ++++++++++++++++++++++++----
 tapset/utrace.stp          |    6 +++---
 tapsets.cxx                |    3 +++
 translate.cxx              |    7 +++++++
 11 files changed, 56 insertions(+), 21 deletions(-)


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systemtap: system-wide probe/trace tool