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When pointer authentication is enabled, some upper bits of the link register (LR[63:VA_SIZE]) are used to store a signature. Therefore, GDB need to remove the signature to get backtraces. GDB has support of pointer authentication. When pointer authenticaion is enabled, GDB requests 8-bytes mask to the target to remove the signature. mask[63:VA_SIZE] should be all set and mask[VA_SIZE-1:0] should be all cleared. GDB removes the signature by addr&~mask or addr|mask. I added a feature to provide the mask for pointer authentication. Signed-off-by: Koudai Iwahori <koudai@google.com> Change-Id: I56fbbf9cc23619b6536ecd326f350c8bf137f322 Reviewed-on: https://review.openocd.org/c/openocd/+/7248 Tested-by: jenkins Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>