1 files changed, 96 insertions, 0 deletions
diff --git a/arch/arm/include/asm/ucontext.h b/arch/arm/include/asm/ucontext.h
new file mode 100644
index 000000000..4048c92d9
--- /dev/null
+++ b/arch/arm/include/asm/ucontext.h
@@ -0,0 +1,96 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASMARM_UCONTEXT_H
+#define _ASMARM_UCONTEXT_H
+
+#include <asm/fpstate.h>
+#include <asm/user.h>
+
+/*
+ * struct sigcontext only has room for the basic registers, but struct
+ * ucontext now has room for all registers which need to be saved and
+ * restored.  Coprocessor registers are stored in uc_regspace.  Each
+ * coprocessor's saved state should start with a documented 32-bit magic
+ * number, followed by a 32-bit word giving the coproccesor's saved size.
+ * uc_regspace may be expanded if necessary, although this takes some
+ * coordination with glibc.
+ */
+
+struct ucontext {
+	unsigned long	  uc_flags;
+	struct ucontext  *uc_link;
+	stack_t		  uc_stack;
+	struct sigcontext uc_mcontext;
+	sigset_t	  uc_sigmask;
+	/* Allow for uc_sigmask growth.  Glibc uses a 1024-bit sigset_t.  */
+	int		  __unused[32 - (sizeof (sigset_t) / sizeof (int))];
+	/* Last for extensibility.  Eight byte aligned because some
+	   coprocessors require eight byte alignment.  */
+ 	unsigned long	  uc_regspace[128] __attribute__((__aligned__(8)));
+};
+
+#ifdef __KERNEL__
+
+/*
+ * Coprocessor save state.  The magic values and specific
+ * coprocessor's layouts are part of the userspace ABI.  Each one of
+ * these should be a multiple of eight bytes and aligned to eight
+ * bytes, to prevent unpredictable padding in the signal frame.
+ */
+
+/*
+ * Dummy padding block: if this magic is encountered, the block should
+ * be skipped using the corresponding size field.
+ */
+#define DUMMY_MAGIC		0xb0d9ed01
+
+#ifdef CONFIG_IWMMXT
+/* iwmmxt_area is 0x98 bytes long, preceded by 8 bytes of signature */
+#define IWMMXT_MAGIC		0x12ef842a
+#define IWMMXT_STORAGE_SIZE	(IWMMXT_SIZE + 8)
+
+struct iwmmxt_sigframe {
+	unsigned long	magic;
+	unsigned long	size;
+	struct iwmmxt_struct storage;
+} __attribute__((__aligned__(8)));
+#endif /* CONFIG_IWMMXT */
+
+#ifdef CONFIG_VFP
+#define VFP_MAGIC		0x56465001
+
+struct vfp_sigframe
+{
+	unsigned long		magic;
+	unsigned long		size;
+	struct user_vfp		ufp;
+	struct user_vfp_exc	ufp_exc;
+} __attribute__((__aligned__(8)));
+
+/*
+ *  8 byte for magic and size, 264 byte for ufp, 12 bytes for ufp_exc,
+ *  4 bytes padding.
+ */
+#define VFP_STORAGE_SIZE	sizeof(struct vfp_sigframe)
+
+#endif /* CONFIG_VFP */
+
+/*
+ * Auxiliary signal frame.  This saves stuff like FP state.
+ * The layout of this structure is not part of the user ABI,
+ * because the config options aren't.  uc_regspace is really
+ * one of these.
+ */
+struct aux_sigframe {
+#ifdef CONFIG_IWMMXT
+	struct iwmmxt_sigframe	iwmmxt;
+#endif
+#ifdef CONFIG_VFP
+	struct vfp_sigframe	vfp;
+#endif
+	/* Something that isn't a valid magic number for any coprocessor.  */
+	unsigned long		end_magic;
+} __attribute__((__aligned__(8)));
+
+#endif
+
+#endif /* !_ASMARM_UCONTEXT_H */