[llvm-commits] [PATCH] Segmented stack fixes, support for Mac, Win32, FreeBSD

[Brian Anderson]

This series provides fixes to segmented stacks and adds support for x86 32-bit and 64-bit Mac, 32-bit Win32 and 64-bit FreeBSD. It builds on the __morestack mechanism implemented for Linux by gcc and LLVM.

For each platform I had to pick a slot in the TCB to store the stack boundary. This is a difficult decision since that is precious real estate. On Win32 I am using the pvArbitrary slot, which is reserved for application use. On FreeBSD it uses tcb_spare.

On Mac I have provisionally picked slot 90, which appears to already be reserved for JavaScript Core. I welcome any suggestions for a better location to store the stack boundary.

The new operating systems only support frames of static size, as that is all that is needed by the Rust language.

Regards,
Brian Anderson

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