| commit | fa7ad458444fd2604fb3930aa6b46f12f367dd59 | [log] [tgz] |
|---|---|---|
| author | Devon H. O'Dell <dhobsd@google.com> | Mon Jan 14 09:30:40 2019 -0800 |
| committer | Devon H. O'Dell <dhobsd@google.com> | Mon Jan 14 11:54:46 2019 -0800 |
| tree | 80ef79013e25026cca28a6c3a79c38769e9977af | |
| parent | 218074baa1ca19e52b6cb5df422f25f8203a5683 [diff] |
[runtime] Re-land vdso traceback support with arm64 fixes This reverts commit d659dafb9e9155ce062a8597bc2194cdcce17f2b, which reverted 570718fb20e426ee5091b3f512966a5913feac87. The original change was crashing because it assumed that R21 was not modified. Syscalls marked as blocking called into runtime.enter/exitsyscall, which trash R21. This caused the finalizer code to store 0 in m.vdsoSP to fail (writing to some random place). This change brings back the original code from 570718fb20e426ee5091b3f512966a5913feac87, adding a fix to grab the M again after returning from runtime.exitsyscall to store 0 in m.vdsoSP. Test: Was able to verify Go code crashing often on qemu arm64 in 570718fb20e426ee5091b3f512966a5913feac87, and no longer crashing with this approach. Change-Id: Ia44b78d52ef2cfa6d860914cd9a49adcaf1e7b40
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