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[binutils-gdb] AArch64: Read pauth registers


*** TEST RESULTS FOR COMMIT 76bed0fd9493868889929ca9dcd32350c1d864be ***

Author: Alan Hayward <alan.hayward@arm.com>
Branch: master
Commit: 76bed0fd9493868889929ca9dcd32350c1d864be

AArch64: Read pauth registers

Initialise the pauth registers when creating a target description, and store
the regnum of the first pauth register.

Use ptrace to read the registers in the pauth feature.

Do not allow the registers to be written.

gdb/ChangeLog:

	* aarch64-linux-nat.c (fetch_pauth_masks_from_thread): New
	function.
	(aarch64_linux_nat_target::fetch_registers): Read pauth registers.
	* aarch64-tdep.c (aarch64_cannot_store_register): New function.
	(aarch64_gdbarch_init): Add puth registers.
	* aarch64-tdep.h (struct gdbarch_tdep): Add pauth features.
	* arch/aarch64.h (AARCH64_PAUTH_DMASK_REGNUM): New define.
	(AARCH64_PAUTH_CMASK_REGNUM): Likewise.


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