state->stack = stackinfo_get_unknown();
}
-/**
- * typedef stack_trace_translate_fp_fn() - Translates a non-kernel frame
- * pointer to a kernel address.
- *
- * @fp: the frame pointer to be updated to its kernel address.
- *
- * Return: true if the VA can be translated, false otherwise.
- *
- * Upon success @fp is updated to the corresponding kernel virtual address.
- */
-typedef bool (*stack_trace_translate_fp_fn)(unsigned long *fp);
-
static struct stack_info *unwind_find_next_stack(const struct unwind_state *state,
unsigned long sp,
unsigned long size)
* unwind_next_frame_record() - Unwind to the next frame record.
*
* @state: the current unwind state.
- * @translate_fp: translates the fp prior to access (may be NULL)
*
* Return: 0 upon success, an error code otherwise.
*/
static inline int
-unwind_next_frame_record(struct unwind_state *state,
- stack_trace_translate_fp_fn translate_fp)
+unwind_next_frame_record(struct unwind_state *state)
{
- unsigned long fp = state->fp, kern_fp = fp;
+ unsigned long fp = state->fp;
int err;
if (fp & 0x7)
if (err)
return err;
- /*
- * If fp is not from the current address space perform the necessary
- * translation before dereferencing it to get the next fp.
- */
- if (translate_fp && !translate_fp(&kern_fp))
- return -EINVAL;
-
/*
* Record this frame record's values.
*/
- state->fp = READ_ONCE(*(unsigned long *)(kern_fp));
- state->pc = READ_ONCE(*(unsigned long *)(kern_fp + 8));
+ state->fp = READ_ONCE(*(unsigned long *)(fp));
+ state->pc = READ_ONCE(*(unsigned long *)(fp + 8));
return 0;
}
};
}
+static struct stack_info stackinfo_get_overflow_kern_va(void)
+{
+ unsigned long low = (unsigned long)this_cpu_ptr_nvhe_sym(overflow_stack);
+ unsigned long high = low + OVERFLOW_STACK_SIZE;
+
+ return (struct stack_info) {
+ .low = low,
+ .high = high,
+ };
+}
+
static struct stack_info stackinfo_get_hyp(void)
{
struct kvm_nvhe_stacktrace_info *stacktrace_info
};
}
+static struct stack_info stackinfo_get_hyp_kern_va(void)
+{
+ unsigned long low = (unsigned long)*this_cpu_ptr(&kvm_arm_hyp_stack_page);
+ unsigned long high = low + PAGE_SIZE;
+
+ return (struct stack_info) {
+ .low = low,
+ .high = high,
+ };
+}
+
/*
* kvm_nvhe_stack_kern_va - Convert KVM nVHE HYP stack addresses to a kernel VAs
*
*/
static bool kvm_nvhe_stack_kern_va(unsigned long *addr, unsigned long size)
{
- struct kvm_nvhe_stacktrace_info *stacktrace_info;
- unsigned long hyp_base, kern_base, hyp_offset;
- struct stack_info stack;
+ struct stack_info stack_hyp, stack_kern;
- stacktrace_info = this_cpu_ptr_nvhe_sym(kvm_stacktrace_info);
-
- stack = stackinfo_get_hyp();
- if (stackinfo_on_stack(&stack, *addr, size)) {
- kern_base = (unsigned long)*this_cpu_ptr(&kvm_arm_hyp_stack_page);
- hyp_base = (unsigned long)stacktrace_info->stack_base;
+ stack_hyp = stackinfo_get_hyp();
+ stack_kern = stackinfo_get_hyp_kern_va();
+ if (stackinfo_on_stack(&stack_hyp, *addr, size))
goto found;
- }
- stack = stackinfo_get_overflow();
- if (stackinfo_on_stack(&stack, *addr, size)) {
- kern_base = (unsigned long)this_cpu_ptr_nvhe_sym(overflow_stack);
- hyp_base = (unsigned long)stacktrace_info->overflow_stack_base;
+ stack_hyp = stackinfo_get_overflow();
+ stack_kern = stackinfo_get_overflow_kern_va();
+ if (stackinfo_on_stack(&stack_hyp, *addr, size))
goto found;
- }
return false;
found:
- hyp_offset = *addr - hyp_base;
-
- *addr = kern_base + hyp_offset;
-
+ *addr = *addr - stack_hyp.low + stack_kern.low;
return true;
}
static int unwind_next(struct unwind_state *state)
{
- return unwind_next_frame_record(state, kvm_nvhe_stack_kern_record_va);
+ /*
+ * The FP is in the hypervisor VA space. Convert it to the kernel VA
+ * space so it can be unwound by the regular unwind functions.
+ */
+ if (!kvm_nvhe_stack_kern_record_va(&state->fp))
+ return -EINVAL;
+
+ return unwind_next_frame_record(state);
}
static void unwind(struct unwind_state *state,
{
struct kvm_nvhe_stacktrace_info *stacktrace_info;
struct stack_info stacks[] = {
- stackinfo_get_overflow(),
- stackinfo_get_hyp(),
+ stackinfo_get_overflow_kern_va(),
+ stackinfo_get_hyp_kern_va(),
};
struct unwind_state state = {
.stacks = stacks,