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Fix handling of uncaught exceptions in a std::terminate() handler on arm.

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When raising an exception, the unwinder searches for a catch handler and if
none is found it should invoke std::terminate() with the uncaught exception
as the "current" exception.  Before this change, the terminate handler was
invoked with no exception as current (abi::__cxa_current_exception_type()
returned NULL), because the return value from the unwinder indicated an
internal failure in unwinding.  It turns out that was because all errors
from get_eit_entry() were translated to _URC_FAILURE.  Now the error is
returned untranslated, which allows _URC_END_OF_STACK to percolate upwards
to throw_exception() in libcxxrt.  When it sees that return status it
properly calls std::terminate() with the uncaught exception installed
as the current exception, allowing custom terminate handlers to work
with it.
This commit is contained in:
Ian Lepore 2017-09-25 23:24:41 +00:00
parent 05572d356b
commit 237d41f89e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=323997
1 changed files with 2 additions and 2 deletions
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4
contrib/gcc/config/arm/unwind-arm.c
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@ -625,8 +625,8 @@ __gnu_Unwind_RaiseException (_Unwind_Control_Block * ucbp,
do
{
/* Find the entry for this routine. */
if (get_eit_entry (ucbp, saved_vrs.core.r[R_PC]) != _URC_OK)
return _URC_FAILURE;
if ((pr_result = get_eit_entry (ucbp, saved_vrs.core.r[R_PC])) != _URC_OK)
return pr_result;
/* Call the pr to decide what to do. */
pr_result = ((personality_routine) UCB_PR_ADDR (ucbp))