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Ben Gamari authored
This is a bit ugly as we need to assume the structure of the C stack as left by StgRun. Nevertheless, it allows us to unwind all the way back to `_start` on my machine. ``` Stack trace: set_initial_registers (rts/Libdw.c:272.0) dwfl_thread_getframes dwfl_getthreads dwfl_getthread_frames libdw_get_backtrace (rts/Libdw.c:243.0) base_GHCziExecutionStack_getStackTrace1_info (libraries/base/GHC/ExecutionStack.hs:43.1) base_GHCziExecutionStack_showStackTrace1_info (libraries/base/GHC/ExecutionStack.hs:47.1) base_GHCziBase_bindIO1_info (libraries/base/GHC/Base.hs:1085.1) base_GHCziBase_thenIO1_info (libraries/base/GHC/Base.hs:1088.1) base_GHCziBase_thenIO1_info (libraries/base/GHC/Base.hs:1088.1) base_GHCziBase_thenIO1_info (libraries/base/GHC/Base.hs:1088.1) base_GHCziBase_thenIO1_info (libraries/base/GHC/Base.hs:1088.1) base_GHCziBase_thenIO1_info (libraries/base/GHC/Base.hs:1088.1) stg_catch_frame_info (rts/Exception.cmm:370.1) stg_stop_thread_info (rts/StgStartup.cmm:42.1) scheduleWaitThread (rts/Schedule.c:465.0) hs_main (rts/RtsMain.c:65.0) __libc_start_main (/tmp/buildd/glibc-2.19/csu/libc-start.c:321.0) _start ```
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