1 files changed, 136 insertions, 0 deletions
diff --git a/arch/mips/vdso/genvdso.h b/arch/mips/vdso/genvdso.h
new file mode 100644
index 000000000..611b06f01
--- /dev/null
+++ b/arch/mips/vdso/genvdso.h
@@ -0,0 +1,136 @@
+/*
+ * Copyright (C) 2015 Imagination Technologies
+ * Author: Alex Smith <alex.smith@imgtec.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+static inline bool FUNC(patch_vdso)(const char *path, void *vdso)
+{
+	const ELF(Ehdr) *ehdr = vdso;
+	void *shdrs;
+	ELF(Shdr) *shdr;
+	char *shstrtab, *name;
+	uint16_t sh_count, sh_entsize, i;
+
+	shdrs = vdso + FUNC(swap_uint)(ehdr->e_shoff);
+	sh_count = swap_uint16(ehdr->e_shnum);
+	sh_entsize = swap_uint16(ehdr->e_shentsize);
+
+	shdr = shdrs + (sh_entsize * swap_uint16(ehdr->e_shstrndx));
+	shstrtab = vdso + FUNC(swap_uint)(shdr->sh_offset);
+
+	for (i = 0; i < sh_count; i++) {
+		shdr = shdrs + (i * sh_entsize);
+		name = shstrtab + swap_uint32(shdr->sh_name);
+
+		/*
+		 * Ensure there are no relocation sections - ld.so does not
+		 * relocate the VDSO so if there are relocations things will
+		 * break.
+		 */
+		switch (swap_uint32(shdr->sh_type)) {
+		case SHT_REL:
+		case SHT_RELA:
+			fprintf(stderr,
+				"%s: '%s' contains relocation sections\n",
+				program_name, path);
+			return false;
+		}
+
+		/* Check for existing sections. */
+		if (strcmp(name, ".MIPS.abiflags") == 0) {
+			fprintf(stderr,
+				"%s: '%s' already contains a '.MIPS.abiflags' section\n",
+				program_name, path);
+			return false;
+		}
+
+		if (strcmp(name, ".mips_abiflags") == 0) {
+			strcpy(name, ".MIPS.abiflags");
+			shdr->sh_type = swap_uint32(SHT_MIPS_ABIFLAGS);
+			shdr->sh_entsize = shdr->sh_size;
+		}
+	}
+
+	return true;
+}
+
+static inline bool FUNC(get_symbols)(const char *path, void *vdso)
+{
+	const ELF(Ehdr) *ehdr = vdso;
+	void *shdrs, *symtab;
+	ELF(Shdr) *shdr;
+	const ELF(Sym) *sym;
+	char *strtab, *name;
+	uint16_t sh_count, sh_entsize, st_count, st_entsize, i, j;
+	uint64_t offset;
+	uint32_t flags;
+
+	shdrs = vdso + FUNC(swap_uint)(ehdr->e_shoff);
+	sh_count = swap_uint16(ehdr->e_shnum);
+	sh_entsize = swap_uint16(ehdr->e_shentsize);
+
+	for (i = 0; i < sh_count; i++) {
+		shdr = shdrs + (i * sh_entsize);
+
+		if (swap_uint32(shdr->sh_type) == SHT_SYMTAB)
+			break;
+	}
+
+	if (i == sh_count) {
+		fprintf(stderr, "%s: '%s' has no symbol table\n", program_name,
+			path);
+		return false;
+	}
+
+	/* Get flags */
+	flags = swap_uint32(ehdr->e_flags);
+	if (elf_class == ELFCLASS64)
+		elf_abi = ABI_N64;
+	else if (flags & EF_MIPS_ABI2)
+		elf_abi = ABI_N32;
+	else
+		elf_abi = ABI_O32;
+
+	/* Get symbol table. */
+	symtab = vdso + FUNC(swap_uint)(shdr->sh_offset);
+	st_entsize = FUNC(swap_uint)(shdr->sh_entsize);
+	st_count = FUNC(swap_uint)(shdr->sh_size) / st_entsize;
+
+	/* Get string table. */
+	shdr = shdrs + (swap_uint32(shdr->sh_link) * sh_entsize);
+	strtab = vdso + FUNC(swap_uint)(shdr->sh_offset);
+
+	/* Write offsets for symbols needed by the kernel. */
+	for (i = 0; vdso_symbols[i].name; i++) {
+		if (!(vdso_symbols[i].abis & elf_abi))
+			continue;
+
+		for (j = 0; j < st_count; j++) {
+			sym = symtab + (j * st_entsize);
+			name = strtab + swap_uint32(sym->st_name);
+
+			if (!strcmp(name, vdso_symbols[i].name)) {
+				offset = FUNC(swap_uint)(sym->st_value);
+
+				fprintf(out_file,
+					"\t.%s = 0x%" PRIx64 ",\n",
+					vdso_symbols[i].offset_name, offset);
+				break;
+			}
+		}
+
+		if (j == st_count) {
+			fprintf(stderr,
+				"%s: '%s' is missing required symbol '%s'\n",
+				program_name, path, vdso_symbols[i].name);
+			return false;
+		}
+	}
+
+	return true;
+}