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powerpc/64: remove support for kernel-mode syscalls

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There is support for the kernel to execute the 'sc 0' instruction and
make a system call to itself. This is a relic that is unused in the
tree, therefore untested. It's also highly questionable for modules to
be doing this.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190827033010.28090-3-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin
2019-08-27 13:30:07 +10:00
committed by Michael Ellerman
parent facd04a904
commit 555e28179d
2 changed files with 6 additions and 17 deletions
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2
arch/powerpc/kernel/exceptions-64s.S
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@@ -1522,8 +1522,6 @@ EXC_COMMON(trap_0b_common, 0xb00, unknown_exception)
* system call / hypercall (0xc00, 0x4c00)
*
* The system call exception is invoked with "sc 0" and does not alter HV bit.
* There is support for kernel code to invoke system calls but there are no
* in-tree users.
*
* The hypercall is invoked with "sc 1" and sets HV=1.
*