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Minor README fix.

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Landon Fuller
2010-09-19 19:57:17 -07:00
parent 4fbcb5b5fb
commit 53f387b203
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README.markdown
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@@ -3,7 +3,7 @@ libffi-ios provides an experimental port of libffi to Apple's iOS.
The libffi closure mechanism has previously required the use of executable data pages, however, iOS sandbox restrictions prevent their use. The libffi closure mechanism has previously required the use of executable data pages, however, iOS sandbox restrictions prevent their use.
The OS does, however, permit remapping of executable pages, allowing one to remap a single page to multiple locations. libffi-ios modifies The OS does, however, permit remapping of executable pages, allowing one to remap a single page to multiple locations. libffi-ios modifies
ffi_closure_alloc/ffi_closure_free APIs to make use of this functionality to implement dynamically allocated and configured closure ffi_closure_alloc/ffi_closure_free APIs to make use of this functionality to implement dynamically allocated and configured closure
trampoline's without requiring the use of executable data. trampolines without requiring the use of executable data.
The implementation works by allocating a writable config page, and then remapping a page of pre-compiled trampolines directly The implementation works by allocating a writable config page, and then remapping a page of pre-compiled trampolines directly
after the config page. The trampolines use PC-relative addressing to load their context from the config page, and so it is possible after the config page. The trampolines use PC-relative addressing to load their context from the config page, and so it is possible