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* runtime/uprobes2/uprobes.c (uprobe_get_pc_task): new function
(lookup_uretprobe): new helper function
(uprobe_get_pc): use it
* runtime/uprobes2/uprobes.h (uprobe_get_pc_task): declare
* runtime/uprobes/uprobes.c : ditto
* runtime/uprobes/uprobes.h : ditto
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This implements proper unwinding from uprobes in the presence of
uretprobe trampolines.
* runtime/stack.c (_stp_stack_print): Rework for uprobe context case
and refactor a bit.
* runtime/uprobes2/uprobes.h (GET_PC_URETPROBE_NONE): new constant
* runtime/uprobes2/uprobes.c (uprobe_get_pc): Support translating the
trampoline function from uprobe context in addition to uretprobe
context.
* runtime/uprobes/uprobes.h (GET_PC_URETPROBE_NONE): ditto
* runtime/uprobes/uprobes.c (uprobe_get_pc): ditto
* tapsets.cxx (uprobe_derived_probe_group::emit_module_decls):
Initialize ri in context to GET_PC_URETPROBE_NONE in generated
enter_uprobe_probe.
* testsuite/systemtap.context/fib.stp: Add an option to do a backtrace
on function entry.
* testsuite/systemtap.context/fib.exp: Test backtrace in function
entry (uprobe) probes.
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* tapset-utrace.cxx (utrace_derived_probe_group::emit_module_decls):
Handles new utrace api.
* runtime/itrace.c (usr_itrace_report_signal): Ditto.
(usr_itrace_report_clone): Ditto.
(usr_itrace_report_death): Ditto.
* runtime/task_finder.c (__stp_utrace_task_finder_report_clone): Ditto.
(__stp_utrace_task_finder_report_exec): Ditto.
(__stap_utrace_task_finder_report_death): Ditto.
(__stp_utrace_task_finder_target_death): Ditto.
(__stp_utrace_task_finder_target_quiesce): Ditto.
(__stp_utrace_task_finder_target_syscall_entry): Ditto.
(__stp_utrace_task_finder_target_syscall_exit): Ditto.
* runtime/uprobes2/uprobes.c (uprobe_report_signal): Ditto.
(uprobe_report_quiesce): Ditto.
(uprobe_report_exit): Ditto.
(uprobe_report_clone): Ditto.
(uprobe_report_exec): Ditto.
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return address
* runtime/uprobes2/uprobes.c (uprobe_get_pc): new function
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uprobe_fork_uproc() runs with parent_uproc->rwsem locked.
However uprobe_mk_process() that gets called within uprobe_fork_uproc()
also locks child_uproc->rwsem after initializing it.
Lockdep report confuses this to acquiring a lock that already has been
acquired and suggests using sub-classes.
The alternatives we have are:
1. use classes level to distinguish different uproc structures.
2. unlock parent_uproc->rwsem before we call uprobe_fork_uproc().
3. dont try locking child_uproc->rwsem; since we are protected by
uproc_mutex as well as parent_uproc->rwsem;
We use the last approach.
Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
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We allocate a "fake" unlinked shmem file because anonymous
memory might not be granted execute permission when the selinux
security hooks have their way. Only do this for 2.6.28 or higher
since shmem_file_setup() isn't exported before that.
* runtime/uprobes2/uprobes.c (uprobe_setup_ssol_vma): Use shmem_file_setup
to setup the ssol vma area when using 2.6.28+.
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For uprobes 1 and 2, add unmap_u[ret]probe() and define UPROBES_API_VERSION=2.
Adapt tapsets.cxx accordingly.
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Adjusted all headers that #include <linux/utrace.h> to follow with:
/* PR9974: Adapt to struct renaming. */
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