21dfaf60a7
On AArch64, it is possible to have a program that accesses both low (0x000...) and high (0xfff...) memory, and with pointer authentication, you can have different numbers of bits used for pointer authentication depending on whether the address is in high or low memory. This adds a new target.process.highmem-virtual-addressable-bits setting which the AArch64 Mac ABI plugin will use, when set, to always set those unaddressable high bits for high memory addresses, and will use the existing target.process.virtual-addressable-bits setting for low memory addresses. This patch does not change the existing behavior when only target.process.virtual-addressable-bits is set. In that case, the value will apply to all addresses. Not yet done is recognizing metadata in a live process connection (gdb-remote qHostInfo) or a Mach-O corefile LC_NOTE to set the correct number of addressing bits for both memory ranges. That will be a future change. Differential Revision: https://reviews.llvm.org/D151292 rdar://109746900
The LLVM Compiler Infrastructure
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