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hvf: add guest debugging handlers for Apple Silicon hosts

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Guests can now be debugged through the gdbstub. Support is added for
single-stepping, software breakpoints, hardware breakpoints and
watchpoints. The code has been structured like the KVM counterpart.

While guest debugging is enabled, the guest can still read and write the
DBG*_EL1 registers but they don't have any effect.

Signed-off-by: Francesco Cagnin <fcagnin@quarkslab.com>
Message-id: 20230601153107.81955-5-fcagnin@quarkslab.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Francesco Cagnin 2023-06-06 10:19:30 +01:00 • committed by Peter Maydell
parent f41520402c
commit eb2edc42b1
7 changed files with 520 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

10
accel/hvf/hvf-accel-ops.c
View file

@ -343,12 +343,18 @@ static int hvf_accel_init(MachineState *ms)
return hvf_arch_init();
}
static inline int hvf_gdbstub_sstep_flags(void)
{
return SSTEP_ENABLE | SSTEP_NOIRQ;
}
static void hvf_accel_class_init(ObjectClass *oc, void *data)
{
AccelClass *ac = ACCEL_CLASS(oc);
ac->name = "HVF";
ac->init_machine = hvf_accel_init;
ac->allowed = &hvf_allowed;
ac->gdbstub_supported_sstep_flags = hvf_gdbstub_sstep_flags;
}
static const TypeInfo hvf_accel_type = {
@ -398,6 +404,8 @@ static int hvf_init_vcpu(CPUState *cpu)
cpu->vcpu_dirty = 1;
assert_hvf_ok(r);
cpu->hvf->guest_debug_enabled = false;
return hvf_arch_init_vcpu(cpu);
}
@ -582,6 +590,8 @@ static void hvf_accel_ops_class_init(ObjectClass *oc, void *data)
ops->insert_breakpoint = hvf_insert_breakpoint;
ops->remove_breakpoint = hvf_remove_breakpoint;
ops->remove_all_breakpoints = hvf_remove_all_breakpoints;
ops->update_guest_debug = hvf_update_guest_debug;
ops->supports_guest_debug = hvf_arch_supports_guest_debug;
};
static const TypeInfo hvf_accel_ops_type = {
.name = ACCEL_OPS_NAME("hvf"),

6
accel/hvf/hvf-all.c
View file

@ -61,3 +61,9 @@ int hvf_sw_breakpoints_active(CPUState *cpu)
{
return !QTAILQ_EMPTY(&hvf_state->hvf_sw_breakpoints);
}
int hvf_update_guest_debug(CPUState *cpu)
{
hvf_arch_update_guest_debug(cpu);
return 0;
}