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0e5c9a9d65
When returning to userspace to handle a SMCCC call, we consistently set PC to point to the instruction immediately after the HVC/SMC. However, should userspace need to know the exact address of the trapping instruction, it needs to know about the *size* of that instruction. For AArch64, this is pretty easy. For AArch32, this is a bit more funky, as Thumb has 16bit encodings for both HVC and SMC. Expose this to userspace with a new flag that directly derives from ESR_EL2.IL. Also update the documentation to reflect the PC state at the point of exit. Finally, this fixes a small buglet where the hypercall.{args,ret} fields would not be cleared on exit, and could contain some random junk. Reviewed-by: Oliver Upton <oliver.upton@linux.dev> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/86pm8iv8tj.wl-maz@kernel.org |
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boot | ||
configs | ||
crypto | ||
hyperv | ||
include | ||
kernel | ||
kvm | ||
lib | ||
mm | ||
net | ||
tools | ||
xen | ||
Kbuild | ||
Kconfig | ||
Kconfig.debug | ||
Kconfig.platforms | ||
Makefile |