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dcd93505da
Right now, ARM EHABI unwind on bare metal expects to find the symbols __exidx_start and __exidx_end defined, and uses those to locate the EH tables. However, DWARF unwind on bare metal expects to find dl_iterate_phdr, which, although possible to provide, is inconvenient and mildly absurd. This commit provides feature parity with ARM EHABI unwind by looking for symbols __eh_frame_start, __eh_frame_end, __eh_frame_hdr_start and __eh_frame_hdr_end, denoting the start and end of the sections with corresponding names. As far as I know, there is no de jure or de facto ABI providing any such names, so I chose the obvious ones. The .eh_frame_hdr support is optional for maximum flexibility and possible space savings (e.g. if libunwind is only used to provide backtraces when a device crashes, providing the .eh_frame_hdr, which is an index for rapid access to EH tables, would be a waste.) The support for .eh_frame_hdr/DWARF index in the first place is conditional on defined(_LIBUNWIND_SUPPORT_DWARF_INDEX), although right now config.h will always define this macro. The support for DWARF unwind on bare metal has been validated within the ARTIQ environment[1]. [1]: https://m-labs.hk/artiq/ llvm-svn: 321445 |
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| .clang-format | ||
| CMakeLists.txt | ||
| LICENSE.TXT | ||