forked from OSchip/llvm-project
fa1ef7d89c
While porting libunwind over to CloudABI for ARMv6, I observed that this source file doesn't build, as it depends on dl_unwind_find_exidx(), which CloudABI's C library was lacking. After I added that function, I still needed to patch up libunwind to define _Unwind_Ptr. Taking a step back, I wonder why we need to make use of this function anyway. The unwinder already has some nice code to use dl_iterate_phdr() to scan for a PT_GNU_EH_FRAME header. The dl_unwind_find_exidx() does the same thing, except matching PT_ARM_EXIDX instead. We could also do that ourselves. This change gets rid of the dl_unwind_find_exidx() call and extends the dl_iterate_phdr() loop. This approach has the advantage of getting rid of some of those OS-specific #ifdefs. This now means that if an operating system only provides dl_iterate_phdr(), it gets support for unwinding on all architectures. There is no need to add more stuff, just to get ARMv6 support. This change is identical to r295944, except that it now adds the necessary code to do bounds checking on PT_LOAD. The previous version of this change lacked this, which didn't cause any problems on CloudABI, but did break the Linux build bots. This is why I reverted it in r295948. Differential Revision: https://reviews.llvm.org/D30306 llvm-svn: 296991 |
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| .arcconfig | ||
| .clang-format | ||
| CMakeLists.txt | ||
| LICENSE.TXT | ||