1 files changed, 77 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/module.h b/arch/arm64/include/asm/module.h
new file mode 100644
index 000000000..18734fed3
--- /dev/null
+++ b/arch/arm64/include/asm/module.h
@@ -0,0 +1,77 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ */
+#ifndef __ASM_MODULE_H
+#define __ASM_MODULE_H
+
+#include <asm-generic/module.h>
+
+#ifdef CONFIG_ARM64_MODULE_PLTS
+struct mod_plt_sec {
+	int			plt_shndx;
+	int			plt_num_entries;
+	int			plt_max_entries;
+};
+
+struct mod_arch_specific {
+	struct mod_plt_sec	core;
+	struct mod_plt_sec	init;
+
+	/* for CONFIG_DYNAMIC_FTRACE */
+	struct plt_entry	*ftrace_trampolines;
+};
+#endif
+
+u64 module_emit_plt_entry(struct module *mod, Elf64_Shdr *sechdrs,
+			  void *loc, const Elf64_Rela *rela,
+			  Elf64_Sym *sym);
+
+u64 module_emit_veneer_for_adrp(struct module *mod, Elf64_Shdr *sechdrs,
+				void *loc, u64 val);
+
+#ifdef CONFIG_RANDOMIZE_BASE
+extern u64 module_alloc_base;
+#else
+#define module_alloc_base	((u64)_etext - MODULES_VSIZE)
+#endif
+
+struct plt_entry {
+	/*
+	 * A program that conforms to the AArch64 Procedure Call Standard
+	 * (AAPCS64) must assume that a veneer that alters IP0 (x16) and/or
+	 * IP1 (x17) may be inserted at any branch instruction that is
+	 * exposed to a relocation that supports long branches. Since that
+	 * is exactly what we are dealing with here, we are free to use x16
+	 * as a scratch register in the PLT veneers.
+	 */
+	__le32	adrp;	/* adrp	x16, ....			*/
+	__le32	add;	/* add	x16, x16, #0x....		*/
+	__le32	br;	/* br	x16				*/
+};
+
+static inline bool is_forbidden_offset_for_adrp(void *place)
+{
+	return IS_ENABLED(CONFIG_ARM64_ERRATUM_843419) &&
+	       cpus_have_const_cap(ARM64_WORKAROUND_843419) &&
+	       ((u64)place & 0xfff) >= 0xff8;
+}
+
+struct plt_entry get_plt_entry(u64 dst, void *pc);
+
+static inline const Elf_Shdr *find_section(const Elf_Ehdr *hdr,
+				    const Elf_Shdr *sechdrs,
+				    const char *name)
+{
+	const Elf_Shdr *s, *se;
+	const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
+
+	for (s = sechdrs, se = sechdrs + hdr->e_shnum; s < se; s++) {
+		if (strcmp(name, secstrs + s->sh_name) == 0)
+			return s;
+	}
+
+	return NULL;
+}
+
+#endif /* __ASM_MODULE_H */