aarch64: add extra_context struct from linux v4.13

allows expanding the signal frame beyond the 4k reserved space.
new in linux commit 33f082614c3443d937f50fe936f284f62bbb4a1b

diff --git a/arch/aarch64/bits/signal.h b/arch/aarch64/bits/signal.h
index 00fb5f33885818feb767b0315130517a21cb5a04..5eb3d91f7262b95e044932cd94b2574fcf4f7e15 100644 (file)
--- a/arch/aarch64/bits/signal.h
+++ b/arch/aarch64/bits/signal.h
@@ -24,6 +24,7 @@ typedef struct sigcontext {
 
 #define FPSIMD_MAGIC 0x46508001
 #define ESR_MAGIC 0x45535201
+#define EXTRA_MAGIC 0x45585401
 struct _aarch64_ctx {
        unsigned int magic;
        unsigned int size;
@@ -38,6 +39,12 @@ struct esr_context {
        struct _aarch64_ctx head;
        unsigned long esr;
 };
+struct extra_context {
+       struct _aarch64_ctx head;
+       unsigned long datap;
+       unsigned int size;
+       unsigned int __reserved[3];
+};
 #else
 typedef struct {
        long double __regs[18+256];