Shawn Anastasio f6a42a36d6 Fix libcontext on PPC64 ELFv2 ... libcontext currently restores and saves the FPSCR register on ppc64. This behavior is fine (though unnecessary) on the ELFv1 ABI which designates the register as volatile, but has been observed to cause crashes on ELFv2 systems. The ELFv2 ABI designates the FPSCR register as Limited-access and specifies specific conditions that must be met to clobber it. It does not seem that a context swap function meets these conditions (and indeed, the save/restore register example in the ABI document does not modify FPSCR). This patch fixes ELFv2 ABI compliance by removing the FPSCR save/restore code in libcontext entirely. This fixes observed crashes on the platform and should have no consequence for ELFv1 support. Fixes: lp:1840088 * https://bugs.launchpad.net/kicad/+bug/1840088 (cherry picked from commit 3e22b75948)		2019-08-14 11:18:25 -07:00
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libcontext.cpp	Fix libcontext on PPC64 ELFv2	2019-08-14 11:18:25 -07:00