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Fix stdlib/tst-makecontext regression for Nios II

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Chung-Lin Tang 2016-04-25 00:08:17 -07:00
parent d454fd21f4
commit a5507dfa60
2 changed files with 17 additions and 0 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2016-04-25 Chung-Lin Tang <cltang@codesourcery.com>
* sysdeps/unix/sysv/linux/nios2/setcontext.S (__startcontext):
Add nop before __startcontext, add explaining comments.
2016-04-25 Samuel thibault <samuel.thibault@ens-lyon.org>
RFC2292 macros were obsoleted by RFC3542, and should not be exposed

12
sysdeps/unix/sysv/linux/nios2/setcontext.S
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@ -85,6 +85,18 @@ ENTRY(__setcontext)
PSEUDO_END (__setcontext)
weak_alias (__setcontext, setcontext)
/* We add an NOP here to separate between __setcontext/__startcontext.
The wanted behavior that happens is: when unwinding from a function
called inside a makecontext() context, FDE lookup will use
'&__startcontext - 1', then returns NULL for no FDE found,
and immediately ends the unwind, in a normal fashion.
If this NOP word does not exist, FDE lookup just repeatedly finds
__setcontext's FDE in an infinite loop, due to the convention of
using 'address - 1' for FDE lookup. Modifiying/deleting the below
__startcontext's FDE has no help on this. */
nop
ENTRY(__startcontext)
mov r4, r16
bne r4, zero, __setcontext