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Fix the return value from _Unwind_Backtrace() on arm.

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If unwinding stops due to hitting the end of the call chain, the return
value is supposed to be _URC_END_OF_STACK; other values indicate internal
errors.  The return value from get_eit_entry() is now returned without
translating it to _URC_FAILURE, so that callers can see _URC_END_OF_STACK
when it happens.
This commit is contained in:
Ian Lepore 2017-09-25 23:50:10 +00:00
parent 237d41f89e
commit 996a93432a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=323998
1 changed files with 1 additions and 4 deletions
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5
contrib/gcc/config/arm/unwind-arm.c
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@ -773,11 +773,8 @@ __gnu_Unwind_Backtrace(_Unwind_Trace_Fn trace, void * trace_argument,
do
{
/* Find the entry for this routine. */
if (get_eit_entry (ucbp, saved_vrs.core.r[R_PC]) != _URC_OK)
{
code = _URC_FAILURE;
if ((code = get_eit_entry (ucbp, saved_vrs.core.r[R_PC])) != _URC_OK)
break;
}
/* The dwarf unwinder assumes the context structure holds things
like the function and LSDA pointers. The ARM implementation