arm64: debug: don't re-enable debug exceptions on return from el1_dbg

When returning from a debug exception taken from EL1, we unmask debug
exceptions after handling the exception. This is crucial for debug
exceptions taken from EL0, so that any kernel work on the ret_to_user
path can be debugged by kgdb.

However, when returning back to EL1 the only thing left to do is to
restore the original register state before the exception return. If
single-step has been enabled by the debug exception handler, we will
get stuck in an infinite debug exception loop, since we will take the
step exception as soon as we unmask debug exceptions.

This patch avoids unmasking debug exceptions on the debug exception
return path when the exception was taken from EL1.

Fixes: 2a28307 (arm64: debug: avoid accessing mdscr_el1 on fault paths where possible)
Cc: <[email protected]> #3.16+
Reported-by: David Long <[email protected]>
Reported-by: AKASHI Takahiro <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
Signed-off-by: Catalin Marinas <[email protected]>

arch/arm64/kernel/entry.S

@@ -324,7 +324,6 @@ el1_dbg:
  mrs x0, far_el1
  mov x2, sp // struct pt_regs
  bl do_debug_exception
- enable_dbg
  kernel_exit 1
 el1_inv:
  // TODO: add support for undefined instructions in kernel mode