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Author SHA1 Message Date
Arun Sharma
649f1fb344 [X86-64] For local unwinding, we have a defence mechanism against
bad/missing unwind information, which could result in libunwind
dereferencing bad pointers. This mechanism is based on msync(2) system
call and significantly reduces the chances of a bad pointer
dereference in libunwind.

The original idea was to turn this mechanism on only when necessary
i.e. libunwind didn't find proper unwind information for a IP.

There are a couple of problems in the current implementation.

* The flag is global and is modified without locking
* The flag isn't reset when starting a new unwind

The attached patch makes ->validate a per-thread setting by moving it
into struct cursor from unw_local_addr_space and resets it to false
when starting a new unwind. As a result, cursor->as_arg points to the
cursor itself instead of the ucontext (for the local case).

This was found to reduce the number of msync() system calls from an
application using libunwind significantly.

Signed-off-by: Paul Pluzhnikov <ppluzhnikov@google.com>
Signed-off-by: Arun Sharma <arun.sharma@google.com>
2008-06-16 14:35:53 -06:00
Daniel Jacobowitz
3842dac733 Add initial ARM and MIPS support. To support this, also enable the
reading of .debug_frame sections (used in lieu of .eh_frame sections
when they're not available).
2008-02-04 17:16:37 -07:00
Arun Sharma (अरुण)
795529eee3 [x86-64] Add a known good address cache.
This improves the performance of Lperf-simple from 500ns to 195ns
on the avg.

Signed-off-by: Arun Sharma <arun.sharma@google.com>
2006-08-10 21:30:01 -06:00
David Mosberger-Tang
1fdb08e5fc Various fixes to get x86 to compile and work again.
include/dwarf.h: Declare dwarf_reg_state_pool and dwarf_cie_info_pool.
include/dwarf_i.h: Include libunwind_i.h instead of tdep.h.
	Make dwarf_to_unw_regnum() a macro so it doesn't get compiled
	into an object file merely because it include dwarf_i.h (important
	when optimization is turned off).
	(dwarf_read_encoded_pointer_inlined): New function.
include/tdep-x86/libunwind_i.h: Add include of "mempool.h".
include/tdep-x86_64/libunwind_i.h: Add include of "mempool.h".
2006-07-26 22:36:03 -06:00
Arun Sharma
8cdd8bfed8 [x86-64] Make even UNW_LOCAL_ONLY accessors go through validation.
Signed-off-by: Arun Sharma <arun.sharma@google.com>
2006-07-26 21:39:46 -06:00
Arun Sharma
00db7f752a Implement a ip -> dwarf_reg_state cache.
Signed-off-by: Arun Sharma <arun.sharma@google.com>
2006-07-26 21:18:49 -06:00
David Mosberger-Tang
37be21c01e Restore more files wiped out by Bitkeeper->CVS->GIT transition. 2006-07-26 15:09:39 -06:00
hp.com!davidm
180a1ececa Initial revision 2005-05-20 09:48:08 +00:00
hp.com!davidm
bea50a5d41 Adjust for renaming of file.
(tdep_put_unwind_info): Adjust for change of arguments.

2005/05/19 07:42:45-07:00 hp.com!davidm
Rename: include/tdep-x86_64.h -> include/tdep-x86_64/libunwind_i.h

(Logical change 1.294)
2005-05-20 09:48:08 +00:00