[PATCH 22/27] KVM: PPC: Introduce branch patching helper

Alexander Graf
2010-07-01T10:42:57Z

We will need to patch several instruction streams over to a different
code path, so we need a way to patch a single instruction with a branch
somewhere else.

This patch adds a helper to facilitate this patching.

Signed-off-by: Alexander Graf <agraf-l3A5Bk7waGM@public.gmane.org>
---
arch/powerpc/kernel/kvm.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c
index 75c9e0b..337e3e5 100644
--- a/arch/powerpc/kernel/kvm.c
+++ b/arch/powerpc/kernel/kvm.c
@@ -106,6 +106,11 @@ static void kvm_patch_ins_nop(u32 *inst)
kvm_patch_ins(inst, KVM_INST_NOP);
}

+static void kvm_patch_ins_b(u32 *inst, int addr)
+{
+ kvm_patch_ins(inst, KVM_INST_B | (addr & KVM_INST_B_MASK));
+}
+
static u32 *kvm_alloc(int len)
{
u32 *p;
--
1.6.0.2