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| H A D | backtrace.c | b8b31ad00046e163c40427758ec8cf976008e99b Tue Jul 09 10:40:55 UTC 2019 Louis Mayencourt <louis.mayencourt@arm.com> backtrace: Strip PAC field when PAUTH is enabled
When pointer authentication is enabled, the LR value saved on the stack
contains a Pointer Authentication Code (PAC). It must be stripped to
retrieve the return address.
The PAC field is stored on the high bits of the address and defined as:
- PAC field = Xn[54:bottom_PAC_bit], when address tagging is used.
- PAC field = Xn[63:56, 54:bottom_PAC_bit], without address tagging.
With bottom_PAC_bit = 64 - TCR_ELx.TnSZ
Change-Id: I21d804e58200dfeca1da4c2554690bed5d191936
Signed-off-by: Louis Mayencourt <louis.mayencourt@arm.com>
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