Commit 2583c777 authored by Will Deacon's avatar Will Deacon Committed by Greg Kroah-Hartman

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

commit 1059c6bf upstream.

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: 2a283070 (arm64: debug: avoid accessing mdscr_el1 on fault paths where possible)
Reported-by: default avatarDavid Long <dave.long@linaro.org>
Reported-by: default avatarAKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b248aa29
......@@ -298,7 +298,6 @@ 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
......
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