1 files changed, 131 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/inst.h b/arch/powerpc/include/asm/inst.h
new file mode 100644
index 000000000000..45f3ec868258
--- /dev/null
+++ b/arch/powerpc/include/asm/inst.h
@@ -0,0 +1,131 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef _ASM_POWERPC_INST_H
+#define _ASM_POWERPC_INST_H
+
+#include <asm/ppc-opcode.h>
+
+/*
+ * Instruction data type for POWER
+ */
+
+struct ppc_inst {
+	u32 val;
+#ifdef CONFIG_PPC64
+	u32 suffix;
+#endif
+} __packed;
+
+static inline u32 ppc_inst_val(struct ppc_inst x)
+{
+	return x.val;
+}
+
+static inline int ppc_inst_primary_opcode(struct ppc_inst x)
+{
+	return ppc_inst_val(x) >> 26;
+}
+
+#ifdef CONFIG_PPC64
+#define ppc_inst(x) ((struct ppc_inst){ .val = (x), .suffix = 0xff })
+
+#define ppc_inst_prefix(x, y) ((struct ppc_inst){ .val = (x), .suffix = (y) })
+
+static inline u32 ppc_inst_suffix(struct ppc_inst x)
+{
+	return x.suffix;
+}
+
+static inline bool ppc_inst_prefixed(struct ppc_inst x)
+{
+	return (ppc_inst_primary_opcode(x) == 1) && ppc_inst_suffix(x) != 0xff;
+}
+
+static inline struct ppc_inst ppc_inst_swab(struct ppc_inst x)
+{
+	return ppc_inst_prefix(swab32(ppc_inst_val(x)),
+			       swab32(ppc_inst_suffix(x)));
+}
+
+static inline struct ppc_inst ppc_inst_read(const struct ppc_inst *ptr)
+{
+	u32 val, suffix;
+
+	val = *(u32 *)ptr;
+	if ((val >> 26) == OP_PREFIX) {
+		suffix = *((u32 *)ptr + 1);
+		return ppc_inst_prefix(val, suffix);
+	} else {
+		return ppc_inst(val);
+	}
+}
+
+static inline bool ppc_inst_equal(struct ppc_inst x, struct ppc_inst y)
+{
+	return *(u64 *)&x == *(u64 *)&y;
+}
+
+#else
+
+#define ppc_inst(x) ((struct ppc_inst){ .val = x })
+
+static inline bool ppc_inst_prefixed(struct ppc_inst x)
+{
+	return false;
+}
+
+static inline u32 ppc_inst_suffix(struct ppc_inst x)
+{
+	return 0;
+}
+
+static inline struct ppc_inst ppc_inst_swab(struct ppc_inst x)
+{
+	return ppc_inst(swab32(ppc_inst_val(x)));
+}
+
+static inline struct ppc_inst ppc_inst_read(const struct ppc_inst *ptr)
+{
+	return *ptr;
+}
+
+static inline bool ppc_inst_equal(struct ppc_inst x, struct ppc_inst y)
+{
+	return ppc_inst_val(x) == ppc_inst_val(y);
+}
+
+#endif /* CONFIG_PPC64 */
+
+static inline int ppc_inst_len(struct ppc_inst x)
+{
+	return ppc_inst_prefixed(x) ? 8 : 4;
+}
+
+/*
+ * Return the address of the next instruction, if the instruction @value was
+ * located at @location.
+ */
+static inline struct ppc_inst *ppc_inst_next(void *location, struct ppc_inst *value)
+{
+	struct ppc_inst tmp;
+
+	tmp = ppc_inst_read(value);
+
+	return location + ppc_inst_len(tmp);
+}
+
+static inline u64 ppc_inst_as_u64(struct ppc_inst x)
+{
+#ifdef CONFIG_CPU_LITTLE_ENDIAN
+	return (u64)ppc_inst_suffix(x) << 32 | ppc_inst_val(x);
+#else
+	return (u64)ppc_inst_val(x) << 32 | ppc_inst_suffix(x);
+#endif
+}
+
+int probe_user_read_inst(struct ppc_inst *inst,
+			 struct ppc_inst __user *nip);
+
+int probe_kernel_read_inst(struct ppc_inst *inst,
+			   struct ppc_inst *src);
+
+#endif /* _ASM_POWERPC_INST_H */