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Diffstat (limited to 'arch/arm64/include/asm/irq.h')
-rw-r--r--arch/arm64/include/asm/irq.h45
1 files changed, 45 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/irq.h b/arch/arm64/include/asm/irq.h
index 8e8d30684..b77197d94 100644
--- a/arch/arm64/include/asm/irq.h
+++ b/arch/arm64/include/asm/irq.h
@@ -1,10 +1,45 @@
#ifndef __ASM_IRQ_H
#define __ASM_IRQ_H
+#define IRQ_STACK_SIZE THREAD_SIZE
+#define IRQ_STACK_START_SP THREAD_START_SP
+
+#ifndef __ASSEMBLER__
+
+#include <linux/percpu.h>
+
#include <asm-generic/irq.h>
+#include <asm/thread_info.h>
struct pt_regs;
+DECLARE_PER_CPU(unsigned long [IRQ_STACK_SIZE/sizeof(long)], irq_stack);
+
+/*
+ * The highest address on the stack, and the first to be used. Used to
+ * find the dummy-stack frame put down by el?_irq() in entry.S, which
+ * is structured as follows:
+ *
+ * ------------
+ * | | <- irq_stack_ptr
+ * top ------------
+ * | x19 | <- irq_stack_ptr - 0x08
+ * ------------
+ * | x29 | <- irq_stack_ptr - 0x10
+ * ------------
+ *
+ * where x19 holds a copy of the task stack pointer where the struct pt_regs
+ * from kernel_entry can be found.
+ *
+ */
+#define IRQ_STACK_PTR(cpu) ((unsigned long)per_cpu(irq_stack, cpu) + IRQ_STACK_START_SP)
+
+/*
+ * The offset from irq_stack_ptr where entry.S will store the original
+ * stack pointer. Used by unwind_frame() and dump_backtrace().
+ */
+#define IRQ_STACK_TO_TASK_STACK(ptr) (*((unsigned long *)((ptr) - 0x08)))
+
extern void set_handle_irq(void (*handle_irq)(struct pt_regs *));
static inline int nr_legacy_irqs(void)
@@ -12,4 +47,14 @@ static inline int nr_legacy_irqs(void)
return 0;
}
+static inline bool on_irq_stack(unsigned long sp, int cpu)
+{
+ /* variable names the same as kernel/stacktrace.c */
+ unsigned long low = (unsigned long)per_cpu(irq_stack, cpu);
+ unsigned long high = low + IRQ_STACK_START_SP;
+
+ return (low <= sp && sp <= high);
+}
+
+#endif /* !__ASSEMBLER__ */
#endif