[PATCH v9 3/6] target-arm: kvm - support for single step
Alex Bennée
alex.bennee at linaro.org
Thu Nov 12 08:20:48 PST 2015
This adds support for single-step. There isn't much to do on the QEMU
side as after we set-up the request for single step via the debug ioctl
it is all handled within the kernel.
Signed-off-by: Alex Bennée <alex.bennee at linaro.org>
---
v2
- convert to using HSR_EC
v3
- use internals.h definitions
---
target-arm/kvm.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/target-arm/kvm.c b/target-arm/kvm.c
index 50f70ef..d505a7e 100644
--- a/target-arm/kvm.c
+++ b/target-arm/kvm.c
@@ -535,6 +535,13 @@ static int kvm_handle_debug(CPUState *cs, struct kvm_run *run)
kvm_cpu_synchronize_state(cs);
switch (hsr_ec) {
+ case EC_SOFTWARESTEP:
+ if (cs->singlestep_enabled) {
+ return true;
+ } else {
+ error_report("Came out of SINGLE STEP when not enabled");
+ }
+ break;
case EC_AA64_BKPT:
if (kvm_find_sw_breakpoint(cs, env->pc)) {
return true;
@@ -595,6 +602,9 @@ int kvm_arch_on_sigbus(int code, void *addr)
void kvm_arch_update_guest_debug(CPUState *cs, struct kvm_guest_debug *dbg)
{
+ if (cs->singlestep_enabled) {
+ dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP;
+ }
if (kvm_sw_breakpoints_active(cs)) {
dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP;
}
--
2.6.3
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