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authorJames Morse <james.morse@arm.com>2016-04-27 17:47:02 +0100
committerWill Deacon <will.deacon@arm.com>2016-04-28 12:05:46 +0100
commit00a44cdaba0900c63a003e0c431f506f49376a90 (patch)
tree98dbb48f951a2ecab7a0ee09e89bf09a4d754a36 /arch/arm64/kernel/hyp-stub.S
parente7227d0e528f9a96d4a866f43e20dd9b33f0e782 (diff)
arm64: kvm: Move lr save/restore from do_el2_call into EL1
Today the 'hvc' calling KVM or the hyp-stub is expected to preserve all registers. KVM saves/restores the registers it needs on the EL2 stack using do_el2_call(). The hyp-stub has no stack, later patches need to be able to be able to clobber the link register. Move the link register save/restore to the the call sites. Signed-off-by: James Morse <james.morse@arm.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/kernel/hyp-stub.S')
-rw-r--r--arch/arm64/kernel/hyp-stub.S10
1 files changed, 8 insertions, 2 deletions
diff --git a/arch/arm64/kernel/hyp-stub.S b/arch/arm64/kernel/hyp-stub.S
index a272f335c289..7eab8acbbbd9 100644
--- a/arch/arm64/kernel/hyp-stub.S
+++ b/arch/arm64/kernel/hyp-stub.S
@@ -101,10 +101,16 @@ ENDPROC(\label)
*/
ENTRY(__hyp_get_vectors)
+ str lr, [sp, #-16]!
mov x0, xzr
- // fall through
-ENTRY(__hyp_set_vectors)
hvc #0
+ ldr lr, [sp], #16
ret
ENDPROC(__hyp_get_vectors)
+
+ENTRY(__hyp_set_vectors)
+ str lr, [sp, #-16]!
+ hvc #0
+ ldr lr, [sp], #16
+ ret
ENDPROC(__hyp_set_vectors)