#7722: iOS patch no 11: Fix quirk with runtime loader
------------------------------+---------------------------------------------
Reporter: StephenBlackheath | Owner:
Type: feature request | Status: new
Priority: normal | Component: Compiler
Version: 7.7 | Keywords:
Os: Other | Architecture: arm
Failure: None/Unknown | Blockedby:
Blocking: | Related:
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On iOS, due to a quirk, we must put references to external symbols into
the data segment. If, for example, we have a declaration like this:
{{{
foreign import ccall unsafe "static stdlib.h &free"
c_free_finalizer :: FunPtr (Ptr Word8 -> IO ())
}}}
...then it tries to resolve the address of 'free' at runtime. The loader
then attempts to write that address into the text segment. On iOS,
modifying the text segment is not allowed, and so a runtime exception is
thrown.
We work around this issue by fetching the reference to the external symbol
from the data segment.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7722>
GHC <http://www.haskell.org/ghc/>
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