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4eb880e1b5
Ubuntu's libc-bin (2.15-0ubuntu20.2) on x86_64 uses DW_CFA_val_expression in describing the pthread spinlock operations __lll_unlock_wake() and __lll_lock_wait(). libunwind 1.1 doesn't understand that opcode and so backtraces from those operations are truncated. This changeset adds basic support for it, by adding a new type to dwarf_loc_t that describes the register's actual contents rather than its location. I've only implemented the new type for x86_64, and stubbed it out for all other architectures -- it looks like a lot of that code is duplicated so oughtn't to be that hard, but I don't have test cases for them. Tested that DW_CFA_val_expression works on x86_64 (by using https://code.google.com/p/gperftools/ on a lock-heavy program). Build-tested on x86, x86_64 and arm. The unit tests don't pass for me on any of those archs, but this cset doesn't break anything that was passing before. Signed-off-by: Tim Deegan <tjd@phlegethon.org> |
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| dwarf-config.h | ||
| jmpbuf.h | ||
| libunwind_i.h | ||