Initial commit: OpenHarmony-v4.0-ReleaseOpenHarmony-v4.0-Release

7 files changed, 872 insertions, 0 deletions

diff --git a/arch/mips/boot/tools/.gitignore b/arch/mips/boot/tools/.gitignore
new file mode 100644
index 000000000..d36dc7cf9
--- /dev/null
+++ b/arch/mips/boot/tools/.gitignore
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+relocs
diff --git a/arch/mips/boot/tools/Makefile b/arch/mips/boot/tools/Makefile
new file mode 100644
index 000000000..592e05a51
--- /dev/null
+++ b/arch/mips/boot/tools/Makefile
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0
+
+hostprogs       += relocs
+relocs-objs     += relocs_32.o
+relocs-objs     += relocs_64.o
+relocs-objs     += relocs_main.o
+PHONY += relocs
+relocs: $(obj)/relocs
+        @:
diff --git a/arch/mips/boot/tools/relocs.c b/arch/mips/boot/tools/relocs.c
new file mode 100644
index 000000000..1bf53f352
--- /dev/null
+++ b/arch/mips/boot/tools/relocs.c
@@ -0,0 +1,681 @@
+// SPDX-License-Identifier: GPL-2.0
+/* This is included from relocs_32/64.c */
+
+#define ElfW(type)              _ElfW(ELF_BITS, type)
+#define _ElfW(bits, type)       __ElfW(bits, type)
+#define __ElfW(bits, type)      Elf##bits##_##type
+
+#define Elf_Addr                ElfW(Addr)
+#define Elf_Ehdr                ElfW(Ehdr)
+#define Elf_Phdr                ElfW(Phdr)
+#define Elf_Shdr                ElfW(Shdr)
+#define Elf_Sym                 ElfW(Sym)
+
+static Elf_Ehdr ehdr;
+
+struct relocs {
+        uint32_t        *offset;
+        unsigned long   count;
+        unsigned long   size;
+};
+
+static struct relocs relocs;
+
+struct section {
+        Elf_Shdr       shdr;
+        struct section *link;
+        Elf_Sym        *symtab;
+        Elf_Rel        *reltab;
+        char           *strtab;
+        long           shdr_offset;
+};
+static struct section *secs;
+
+static const char * const regex_sym_kernel = {
+/* Symbols matching these regex's should never be relocated */
+        "^(__crc_)",
+};
+
+static regex_t sym_regex_c;
+
+static int regex_skip_reloc(const char *sym_name)
+{
+        return !regexec(&sym_regex_c, sym_name, 0, NULL, 0);
+}
+
+static void regex_init(void)
+{
+        char errbuf[128];
+        int err;
+
+        err = regcomp(&sym_regex_c, regex_sym_kernel,
+                        REG_EXTENDED|REG_NOSUB);
+
+        if (err) {
+                regerror(err, &sym_regex_c, errbuf, sizeof(errbuf));
+                die("%s", errbuf);
+        }
+}
+
+static const char *rel_type(unsigned type)
+{
+        static const char * const type_name[] = {
+#define REL_TYPE(X)[X] = #X
+                REL_TYPE(R_MIPS_NONE),
+                REL_TYPE(R_MIPS_16),
+                REL_TYPE(R_MIPS_32),
+                REL_TYPE(R_MIPS_REL32),
+                REL_TYPE(R_MIPS_26),
+                REL_TYPE(R_MIPS_HI16),
+                REL_TYPE(R_MIPS_LO16),
+                REL_TYPE(R_MIPS_GPREL16),
+                REL_TYPE(R_MIPS_LITERAL),
+                REL_TYPE(R_MIPS_GOT16),
+                REL_TYPE(R_MIPS_PC16),
+                REL_TYPE(R_MIPS_CALL16),
+                REL_TYPE(R_MIPS_GPREL32),
+                REL_TYPE(R_MIPS_64),
+                REL_TYPE(R_MIPS_HIGHER),
+                REL_TYPE(R_MIPS_HIGHEST),
+                REL_TYPE(R_MIPS_PC21_S2),
+                REL_TYPE(R_MIPS_PC26_S2),
+#undef REL_TYPE
+        };
+        const char *name = "unknown type rel type name";
+
+        if (type < ARRAY_SIZE(type_name) && type_name[type])
+                name = type_name[type];
+        return name;
+}
+
+static const char *sec_name(unsigned shndx)
+{
+        const char *sec_strtab;
+        const char *name;
+
+        sec_strtab = secs[ehdr.e_shstrndx].strtab;
+        if (shndx < ehdr.e_shnum)
+                name = sec_strtab + secs[shndx].shdr.sh_name;
+        else if (shndx == SHN_ABS)
+                name = "ABSOLUTE";
+        else if (shndx == SHN_COMMON)
+                name = "COMMON";
+        else
+                name = "<noname>";
+        return name;
+}
+
+static struct section *sec_lookup(const char *secname)
+{
+        int i;
+
+        for (i = 0; i < ehdr.e_shnum; i++)
+                if (strcmp(secname, sec_name(i)) == 0)
+                        return &secs[i];
+
+        return NULL;
+}
+
+static const char *sym_name(const char *sym_strtab, Elf_Sym *sym)
+{
+        const char *name;
+
+        if (sym->st_name)
+                name = sym_strtab + sym->st_name;
+        else
+                name = sec_name(sym->st_shndx);
+        return name;
+}
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+#define le16_to_cpu(val) (val)
+#define le32_to_cpu(val) (val)
+#define le64_to_cpu(val) (val)
+#define be16_to_cpu(val) bswap_16(val)
+#define be32_to_cpu(val) bswap_32(val)
+#define be64_to_cpu(val) bswap_64(val)
+
+#define cpu_to_le16(val) (val)
+#define cpu_to_le32(val) (val)
+#define cpu_to_le64(val) (val)
+#define cpu_to_be16(val) bswap_16(val)
+#define cpu_to_be32(val) bswap_32(val)
+#define cpu_to_be64(val) bswap_64(val)
+#endif
+#if BYTE_ORDER == BIG_ENDIAN
+#define le16_to_cpu(val) bswap_16(val)
+#define le32_to_cpu(val) bswap_32(val)
+#define le64_to_cpu(val) bswap_64(val)
+#define be16_to_cpu(val) (val)
+#define be32_to_cpu(val) (val)
+#define be64_to_cpu(val) (val)
+
+#define cpu_to_le16(val) bswap_16(val)
+#define cpu_to_le32(val) bswap_32(val)
+#define cpu_to_le64(val) bswap_64(val)
+#define cpu_to_be16(val) (val)
+#define cpu_to_be32(val) (val)
+#define cpu_to_be64(val) (val)
+#endif
+
+static uint16_t elf16_to_cpu(uint16_t val)
+{
+        if (ehdr.e_ident[EI_DATA] == ELFDATA2LSB)
+                return le16_to_cpu(val);
+        else
+                return be16_to_cpu(val);
+}
+
+static uint32_t elf32_to_cpu(uint32_t val)
+{
+        if (ehdr.e_ident[EI_DATA] == ELFDATA2LSB)
+                return le32_to_cpu(val);
+        else
+                return be32_to_cpu(val);
+}
+
+static uint32_t cpu_to_elf32(uint32_t val)
+{
+        if (ehdr.e_ident[EI_DATA] == ELFDATA2LSB)
+                return cpu_to_le32(val);
+        else
+                return cpu_to_be32(val);
+}
+
+#define elf_half_to_cpu(x)      elf16_to_cpu(x)
+#define elf_word_to_cpu(x)      elf32_to_cpu(x)
+
+#if ELF_BITS == 64
+static uint64_t elf64_to_cpu(uint64_t val)
+{
+        if (ehdr.e_ident[EI_DATA] == ELFDATA2LSB)
+                return le64_to_cpu(val);
+        else
+                return be64_to_cpu(val);
+}
+#define elf_addr_to_cpu(x)      elf64_to_cpu(x)
+#define elf_off_to_cpu(x)       elf64_to_cpu(x)
+#define elf_xword_to_cpu(x)     elf64_to_cpu(x)
+#else
+#define elf_addr_to_cpu(x)      elf32_to_cpu(x)
+#define elf_off_to_cpu(x)       elf32_to_cpu(x)
+#define elf_xword_to_cpu(x)     elf32_to_cpu(x)
+#endif
+
+static void read_ehdr(FILE *fp)
+{
+        if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1)
+                die("Cannot read ELF header: %s\n", strerror(errno));
+
+        if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0)
+                die("No ELF magic\n");
+
+        if (ehdr.e_ident[EI_CLASS] != ELF_CLASS)
+                die("Not a %d bit executable\n", ELF_BITS);
+
+        if ((ehdr.e_ident[EI_DATA] != ELFDATA2LSB) &&
+            (ehdr.e_ident[EI_DATA] != ELFDATA2MSB))
+                die("Unknown ELF Endianness\n");
+
+        if (ehdr.e_ident[EI_VERSION] != EV_CURRENT)
+                die("Unknown ELF version\n");
+
+        /* Convert the fields to native endian */
+        ehdr.e_type      = elf_half_to_cpu(ehdr.e_type);
+        ehdr.e_machine   = elf_half_to_cpu(ehdr.e_machine);
+        ehdr.e_version   = elf_word_to_cpu(ehdr.e_version);
+        ehdr.e_entry     = elf_addr_to_cpu(ehdr.e_entry);
+        ehdr.e_phoff     = elf_off_to_cpu(ehdr.e_phoff);
+        ehdr.e_shoff     = elf_off_to_cpu(ehdr.e_shoff);
+        ehdr.e_flags     = elf_word_to_cpu(ehdr.e_flags);
+        ehdr.e_ehsize    = elf_half_to_cpu(ehdr.e_ehsize);
+        ehdr.e_phentsize = elf_half_to_cpu(ehdr.e_phentsize);
+        ehdr.e_phnum     = elf_half_to_cpu(ehdr.e_phnum);
+        ehdr.e_shentsize = elf_half_to_cpu(ehdr.e_shentsize);
+        ehdr.e_shnum     = elf_half_to_cpu(ehdr.e_shnum);
+        ehdr.e_shstrndx  = elf_half_to_cpu(ehdr.e_shstrndx);
+
+        if ((ehdr.e_type != ET_EXEC) && (ehdr.e_type != ET_DYN))
+                die("Unsupported ELF header type\n");
+
+        if (ehdr.e_machine != ELF_MACHINE)
+                die("Not for %s\n", ELF_MACHINE_NAME);
+
+        if (ehdr.e_version != EV_CURRENT)
+                die("Unknown ELF version\n");
+
+        if (ehdr.e_ehsize != sizeof(Elf_Ehdr))
+                die("Bad Elf header size\n");
+
+        if (ehdr.e_phentsize != sizeof(Elf_Phdr))
+                die("Bad program header entry\n");
+
+        if (ehdr.e_shentsize != sizeof(Elf_Shdr))
+                die("Bad section header entry\n");
+
+        if (ehdr.e_shstrndx >= ehdr.e_shnum)
+                die("String table index out of bounds\n");
+}
+
+static void read_shdrs(FILE *fp)
+{
+        int i;
+        Elf_Shdr shdr;
+
+        secs = calloc(ehdr.e_shnum, sizeof(struct section));
+        if (!secs)
+                die("Unable to allocate %d section headers\n", ehdr.e_shnum);
+
+        if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0)
+                die("Seek to %d failed: %s\n", ehdr.e_shoff, strerror(errno));
+
+        for (i = 0; i < ehdr.e_shnum; i++) {
+                struct section *sec = &secs[i];
+
+                sec->shdr_offset = ftell(fp);
+                if (fread(&shdr, sizeof(shdr), 1, fp) != 1)
+                        die("Cannot read ELF section headers %d/%d: %s\n",
+                            i, ehdr.e_shnum, strerror(errno));
+                sec->shdr.sh_name      = elf_word_to_cpu(shdr.sh_name);
+                sec->shdr.sh_type      = elf_word_to_cpu(shdr.sh_type);
+                sec->shdr.sh_flags     = elf_xword_to_cpu(shdr.sh_flags);
+                sec->shdr.sh_addr      = elf_addr_to_cpu(shdr.sh_addr);
+                sec->shdr.sh_offset    = elf_off_to_cpu(shdr.sh_offset);
+                sec->shdr.sh_size      = elf_xword_to_cpu(shdr.sh_size);
+                sec->shdr.sh_link      = elf_word_to_cpu(shdr.sh_link);
+                sec->shdr.sh_info      = elf_word_to_cpu(shdr.sh_info);
+                sec->shdr.sh_addralign = elf_xword_to_cpu(shdr.sh_addralign);
+                sec->shdr.sh_entsize   = elf_xword_to_cpu(shdr.sh_entsize);
+                if (sec->shdr.sh_link < ehdr.e_shnum)
+                        sec->link = &secs[sec->shdr.sh_link];
+        }
+}
+
+static void read_strtabs(FILE *fp)
+{
+        int i;
+
+        for (i = 0; i < ehdr.e_shnum; i++) {
+                struct section *sec = &secs[i];
+
+                if (sec->shdr.sh_type != SHT_STRTAB)
+                        continue;
+
+                sec->strtab = malloc(sec->shdr.sh_size);
+                if (!sec->strtab)
+                        die("malloc of %d bytes for strtab failed\n",
+                            sec->shdr.sh_size);
+
+                if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0)
+                        die("Seek to %d failed: %s\n",
+                            sec->shdr.sh_offset, strerror(errno));
+
+                if (fread(sec->strtab, 1, sec->shdr.sh_size, fp) !=
+                    sec->shdr.sh_size)
+                        die("Cannot read symbol table: %s\n", strerror(errno));
+        }
+}
+
+static void read_symtabs(FILE *fp)
+{
+        int i, j;
+
+        for (i = 0; i < ehdr.e_shnum; i++) {
+                struct section *sec = &secs[i];
+                if (sec->shdr.sh_type != SHT_SYMTAB)
+                        continue;
+
+                sec->symtab = malloc(sec->shdr.sh_size);
+                if (!sec->symtab)
+                        die("malloc of %d bytes for symtab failed\n",
+                            sec->shdr.sh_size);
+
+                if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0)
+                        die("Seek to %d failed: %s\n",
+                            sec->shdr.sh_offset, strerror(errno));
+
+                if (fread(sec->symtab, 1, sec->shdr.sh_size, fp) !=
+                    sec->shdr.sh_size)
+                        die("Cannot read symbol table: %s\n", strerror(errno));
+
+                for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Sym); j++) {
+                        Elf_Sym *sym = &sec->symtab[j];
+
+                        sym->st_name  = elf_word_to_cpu(sym->st_name);
+                        sym->st_value = elf_addr_to_cpu(sym->st_value);
+                        sym->st_size  = elf_xword_to_cpu(sym->st_size);
+                        sym->st_shndx = elf_half_to_cpu(sym->st_shndx);
+                }
+        }
+}
+
+static void read_relocs(FILE *fp)
+{
+        static unsigned long base = 0;
+        int i, j;
+
+        if (!base) {
+                struct section *sec = sec_lookup(".text");
+
+                if (!sec)
+                        die("Could not find .text section\n");
+
+                base = sec->shdr.sh_addr;
+        }
+
+        for (i = 0; i < ehdr.e_shnum; i++) {
+                struct section *sec = &secs[i];
+
+                if (sec->shdr.sh_type != SHT_REL_TYPE)
+                        continue;
+
+                sec->reltab = malloc(sec->shdr.sh_size);
+                if (!sec->reltab)
+                        die("malloc of %d bytes for relocs failed\n",
+                            sec->shdr.sh_size);
+
+                if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0)
+                        die("Seek to %d failed: %s\n",
+                            sec->shdr.sh_offset, strerror(errno));
+
+                if (fread(sec->reltab, 1, sec->shdr.sh_size, fp) !=
+                    sec->shdr.sh_size)
+                        die("Cannot read symbol table: %s\n", strerror(errno));
+
+                for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) {
+                        Elf_Rel *rel = &sec->reltab[j];
+
+                        rel->r_offset = elf_addr_to_cpu(rel->r_offset);
+                        /* Set offset into kernel image */
+                        rel->r_offset -= base;
+#if (ELF_BITS == 32)
+                        rel->r_info   = elf_xword_to_cpu(rel->r_info);
+#else
+                        /* Convert MIPS64 RELA format - only the symbol
+                         * index needs converting to native endianness
+                         */
+                        rel->r_info   = rel->r_info;
+                        ELF_R_SYM(rel->r_info) = elf32_to_cpu(ELF_R_SYM(rel->r_info));
+#endif
+#if (SHT_REL_TYPE == SHT_RELA)
+                        rel->r_addend = elf_xword_to_cpu(rel->r_addend);
+#endif
+                }
+        }
+}
+
+static void remove_relocs(FILE *fp)
+{
+        int i;
+        Elf_Shdr shdr;
+
+        for (i = 0; i < ehdr.e_shnum; i++) {
+                struct section *sec = &secs[i];
+
+                if (sec->shdr.sh_type != SHT_REL_TYPE)
+                        continue;
+
+                if (fseek(fp, sec->shdr_offset, SEEK_SET) < 0)
+                        die("Seek to %d failed: %s\n",
+                            sec->shdr_offset, strerror(errno));
+
+                if (fread(&shdr, sizeof(shdr), 1, fp) != 1)
+                        die("Cannot read ELF section headers %d/%d: %s\n",
+                            i, ehdr.e_shnum, strerror(errno));
+
+                /* Set relocation section size to 0, effectively removing it.
+                 * This is necessary due to lack of support for relocations
+                 * in objcopy when creating 32bit elf from 64bit elf.
+                 */
+                shdr.sh_size = 0;
+
+                if (fseek(fp, sec->shdr_offset, SEEK_SET) < 0)
+                        die("Seek to %d failed: %s\n",
+                            sec->shdr_offset, strerror(errno));
+
+                if (fwrite(&shdr, sizeof(shdr), 1, fp) != 1)
+                        die("Cannot write ELF section headers %d/%d: %s\n",
+                            i, ehdr.e_shnum, strerror(errno));
+        }
+}
+
+static void add_reloc(struct relocs *r, uint32_t offset, unsigned type)
+{
+        /* Relocation representation in binary table:
+         * |76543210|76543210|76543210|76543210|
+         * |  Type  |  offset from _text >> 2  |
+         */
+        offset >>= 2;
+        if (offset > 0x00FFFFFF)
+                die("Kernel image exceeds maximum size for relocation!\n");
+
+        offset = (offset & 0x00FFFFFF) | ((type & 0xFF) << 24);
+
+        if (r->count == r->size) {
+                unsigned long newsize = r->size + 50000;
+                void *mem = realloc(r->offset, newsize * sizeof(r->offset[0]));
+
+                if (!mem)
+                        die("realloc failed\n");
+
+                r->offset = mem;
+                r->size = newsize;
+        }
+        r->offset[r->count++] = offset;
+}
+
+static void walk_relocs(int (*process)(struct section *sec, Elf_Rel *rel,
+                        Elf_Sym *sym, const char *symname))
+{
+        int i;
+
+        /* Walk through the relocations */
+        for (i = 0; i < ehdr.e_shnum; i++) {
+                char *sym_strtab;
+                Elf_Sym *sh_symtab;
+                struct section *sec_applies, *sec_symtab;
+                int j;
+                struct section *sec = &secs[i];
+
+                if (sec->shdr.sh_type != SHT_REL_TYPE)
+                        continue;
+
+                sec_symtab  = sec->link;
+                sec_applies = &secs[sec->shdr.sh_info];
+                if (!(sec_applies->shdr.sh_flags & SHF_ALLOC))
+                        continue;
+
+                sh_symtab = sec_symtab->symtab;
+                sym_strtab = sec_symtab->link->strtab;
+                for (j = 0; j < sec->shdr.sh_size/sizeof(Elf_Rel); j++) {
+                        Elf_Rel *rel = &sec->reltab[j];
+                        Elf_Sym *sym = &sh_symtab[ELF_R_SYM(rel->r_info)];
+                        const char *symname = sym_name(sym_strtab, sym);
+
+                        process(sec, rel, sym, symname);
+                }
+        }
+}
+
+static int do_reloc(struct section *sec, Elf_Rel *rel, Elf_Sym *sym,
+                      const char *symname)
+{
+        unsigned r_type = ELF_R_TYPE(rel->r_info);
+        unsigned bind = ELF_ST_BIND(sym->st_info);
+
+        if ((bind == STB_WEAK) && (sym->st_value == 0)) {
+                /* Don't relocate weak symbols without a target */
+                return 0;
+        }
+
+        if (regex_skip_reloc(symname))
+                return 0;
+
+        switch (r_type) {
+        case R_MIPS_NONE:
+        case R_MIPS_REL32:
+        case R_MIPS_PC16:
+        case R_MIPS_PC21_S2:
+        case R_MIPS_PC26_S2:
+                /*
+                 * NONE can be ignored and PC relative relocations don't
+                 * need to be adjusted.
+                 */
+        case R_MIPS_HIGHEST:
+        case R_MIPS_HIGHER:
+                /* We support relocating within the same 4Gb segment only,
+                 * thus leaving the top 32bits unchanged
+                 */
+        case R_MIPS_LO16:
+                /* We support relocating by 64k jumps only
+                 * thus leaving the bottom 16bits unchanged
+                 */
+                break;
+
+        case R_MIPS_64:
+        case R_MIPS_32:
+        case R_MIPS_26:
+        case R_MIPS_HI16:
+                add_reloc(&relocs, rel->r_offset, r_type);
+                break;
+
+        default:
+                die("Unsupported relocation type: %s (%d)\n",
+                    rel_type(r_type), r_type);
+                break;
+        }
+
+        return 0;
+}
+
+static int write_reloc_as_bin(uint32_t v, FILE *f)
+{
+        unsigned char buf[4];
+
+        v = cpu_to_elf32(v);
+
+        memcpy(buf, &v, sizeof(uint32_t));
+        return fwrite(buf, 1, 4, f);
+}
+
+static int write_reloc_as_text(uint32_t v, FILE *f)
+{
+        int res;
+
+        res = fprintf(f, "\t.long 0x%08"PRIx32"\n", v);
+        if (res < 0)
+                return res;
+        else
+                return sizeof(uint32_t);
+}
+
+static void emit_relocs(int as_text, int as_bin, FILE *outf)
+{
+        int i;
+        int (*write_reloc)(uint32_t, FILE *) = write_reloc_as_bin;
+        int size = 0;
+        int size_reserved;
+        struct section *sec_reloc;
+
+        sec_reloc = sec_lookup(".data.reloc");
+        if (!sec_reloc)
+                die("Could not find relocation section\n");
+
+        size_reserved = sec_reloc->shdr.sh_size;
+
+        /* Collect up the relocations */
+        walk_relocs(do_reloc);
+
+        /* Print the relocations */
+        if (as_text) {
+                /* Print the relocations in a form suitable that
+                 * gas will like.
+                 */
+                printf(".section \".data.reloc\",\"a\"\n");
+                printf(".balign 4\n");
+                /* Output text to stdout */
+                write_reloc = write_reloc_as_text;
+                outf = stdout;
+        } else if (as_bin) {
+                /* Output raw binary to stdout */
+                outf = stdout;
+        } else {
+                /* Seek to offset of the relocation section.
+                * Each relocation is then written into the
+                * vmlinux kernel image.
+                */
+                if (fseek(outf, sec_reloc->shdr.sh_offset, SEEK_SET) < 0) {
+                        die("Seek to %d failed: %s\n",
+                                sec_reloc->shdr.sh_offset, strerror(errno));
+                }
+        }
+
+        for (i = 0; i < relocs.count; i++)
+                size += write_reloc(relocs.offset[i], outf);
+
+        /* Print a stop, but only if we've actually written some relocs */
+        if (size)
+                size += write_reloc(0, outf);
+
+        if (size > size_reserved)
+                /* Die, but suggest a value for CONFIG_RELOCATION_TABLE_SIZE
+                 * which will fix this problem and allow a bit of headroom
+                 * if more kernel features are enabled
+                 */
+                die("Relocations overflow available space!\n" \
+                    "Please adjust CONFIG_RELOCATION_TABLE_SIZE " \
+                    "to at least 0x%08x\n", (size + 0x1000) & ~0xFFF);
+}
+
+/*
+ * As an aid to debugging problems with different linkers
+ * print summary information about the relocs.
+ * Since different linkers tend to emit the sections in
+ * different orders we use the section names in the output.
+ */
+static int do_reloc_info(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym,
+                                const char *symname)
+{
+        printf("%16s  0x%08x  %16s  %40s  %16s\n",
+                sec_name(sec->shdr.sh_info),
+                (unsigned int)rel->r_offset,
+                rel_type(ELF_R_TYPE(rel->r_info)),
+                symname,
+                sec_name(sym->st_shndx));
+        return 0;
+}
+
+static void print_reloc_info(void)
+{
+        printf("%16s  %10s  %16s  %40s  %16s\n",
+                "reloc section",
+                "offset",
+                "reloc type",
+                "symbol",
+                "symbol section");
+        walk_relocs(do_reloc_info);
+}
+
+#if ELF_BITS == 64
+# define process process_64
+#else
+# define process process_32
+#endif
+
+void process(FILE *fp, int as_text, int as_bin,
+             int show_reloc_info, int keep_relocs)
+{
+        regex_init();
+        read_ehdr(fp);
+        read_shdrs(fp);
+        read_strtabs(fp);
+        read_symtabs(fp);
+        read_relocs(fp);
+        if (show_reloc_info) {
+                print_reloc_info();
+                return;
+        }
+        emit_relocs(as_text, as_bin, fp);
+        if (!keep_relocs)
+                remove_relocs(fp);
+}
diff --git a/arch/mips/boot/tools/relocs.h b/arch/mips/boot/tools/relocs.h
new file mode 100644
index 000000000..607ff0103
--- /dev/null
+++ b/arch/mips/boot/tools/relocs.h
@@ -0,0 +1,46 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef RELOCS_H
+#define RELOCS_H
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <elf.h>
+#include <byteswap.h>
+#define USE_BSD
+#include <endian.h>
+#include <regex.h>
+
+void die(char *fmt, ...);
+
+/*
+ * Introduced for MIPSr6
+ */
+#ifndef R_MIPS_PC21_S2
+#define R_MIPS_PC21_S2          60
+#endif
+
+#ifndef R_MIPS_PC26_S2
+#define R_MIPS_PC26_S2          61
+#endif
+
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+
+enum symtype {
+        S_ABS,
+        S_REL,
+        S_SEG,
+        S_LIN,
+        S_NSYMTYPES
+};
+
+void process_32(FILE *fp, int as_text, int as_bin,
+                int show_reloc_info, int keep_relocs);
+void process_64(FILE *fp, int as_text, int as_bin,
+                int show_reloc_info, int keep_relocs);
+#endif /* RELOCS_H */
diff --git a/arch/mips/boot/tools/relocs_32.c b/arch/mips/boot/tools/relocs_32.c
new file mode 100644
index 000000000..428bea489
--- /dev/null
+++ b/arch/mips/boot/tools/relocs_32.c
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "relocs.h"
+
+#define ELF_BITS 32
+
+#define ELF_MACHINE             EM_MIPS
+#define ELF_MACHINE_NAME        "MIPS"
+#define SHT_REL_TYPE            SHT_REL
+#define Elf_Rel                 ElfW(Rel)
+
+#define ELF_CLASS               ELFCLASS32
+#define ELF_R_SYM(val)          ELF32_R_SYM(val)
+#define ELF_R_TYPE(val)         ELF32_R_TYPE(val)
+#define ELF_ST_TYPE(o)          ELF32_ST_TYPE(o)
+#define ELF_ST_BIND(o)          ELF32_ST_BIND(o)
+#define ELF_ST_VISIBILITY(o)    ELF32_ST_VISIBILITY(o)
+
+#include "relocs.c"
diff --git a/arch/mips/boot/tools/relocs_64.c b/arch/mips/boot/tools/relocs_64.c
new file mode 100644
index 000000000..154015d74
--- /dev/null
+++ b/arch/mips/boot/tools/relocs_64.c
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "relocs.h"
+
+#define ELF_BITS 64
+
+#define ELF_MACHINE             EM_MIPS
+#define ELF_MACHINE_NAME        "MIPS64"
+#define SHT_REL_TYPE            SHT_RELA
+#define Elf_Rel                 Elf64_Rela
+
+typedef uint8_t Elf64_Byte;
+
+typedef union {
+        struct {
+                Elf64_Word r_sym;       /* Symbol index.  */
+                Elf64_Byte r_ssym;      /* Special symbol.  */
+                Elf64_Byte r_type3;     /* Third relocation.  */
+                Elf64_Byte r_type2;     /* Second relocation.  */
+                Elf64_Byte r_type;      /* First relocation.  */
+        } fields;
+        Elf64_Xword unused;
+} Elf64_Mips_Rela;
+
+#define ELF_CLASS               ELFCLASS64
+#define ELF_R_SYM(val)          (((Elf64_Mips_Rela *)(&val))->fields.r_sym)
+#define ELF_R_TYPE(val)         (((Elf64_Mips_Rela *)(&val))->fields.r_type)
+#define ELF_ST_TYPE(o)          ELF64_ST_TYPE(o)
+#define ELF_ST_BIND(o)          ELF64_ST_BIND(o)
+#define ELF_ST_VISIBILITY(o)    ELF64_ST_VISIBILITY(o)
+
+#include "relocs.c"
diff --git a/arch/mips/boot/tools/relocs_main.c b/arch/mips/boot/tools/relocs_main.c
new file mode 100644
index 000000000..e2453a564
--- /dev/null
+++ b/arch/mips/boot/tools/relocs_main.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <endian.h>
+#include <elf.h>
+
+#include "relocs.h"
+
+void die(char *fmt, ...)
+{
+        va_list ap;
+
+        va_start(ap, fmt);
+        vfprintf(stderr, fmt, ap);
+        va_end(ap);
+        exit(1);
+}
+
+static void usage(void)
+{
+        die("relocs [--reloc-info|--text|--bin|--keep] vmlinux\n");
+}
+
+int main(int argc, char **argv)
+{
+        int show_reloc_info, as_text, as_bin, keep_relocs;
+        const char *fname;
+        FILE *fp;
+        int i;
+        unsigned char e_ident[EI_NIDENT];
+
+        show_reloc_info = 0;
+        as_text = 0;
+        as_bin = 0;
+        keep_relocs = 0;
+        fname = NULL;
+        for (i = 1; i < argc; i++) {
+                char *arg = argv[i];
+
+                if (*arg == '-') {
+                        if (strcmp(arg, "--reloc-info") == 0) {
+                                show_reloc_info = 1;
+                                continue;
+                        }
+                        if (strcmp(arg, "--text") == 0) {
+                                as_text = 1;
+                                continue;
+                        }
+                        if (strcmp(arg, "--bin") == 0) {
+                                as_bin = 1;
+                                continue;
+                        }
+                        if (strcmp(arg, "--keep") == 0) {
+                                keep_relocs = 1;
+                                continue;
+                        }
+                } else if (!fname) {
+                        fname = arg;
+                        continue;
+                }
+                usage();
+        }
+        if (!fname)
+                usage();
+
+        fp = fopen(fname, "r+");
+        if (!fp)
+                die("Cannot open %s: %s\n", fname, strerror(errno));
+
+        if (fread(&e_ident, 1, EI_NIDENT, fp) != EI_NIDENT)
+                die("Cannot read %s: %s", fname, strerror(errno));
+
+        rewind(fp);
+        if (e_ident[EI_CLASS] == ELFCLASS64)
+                process_64(fp, as_text,  as_bin, show_reloc_info, keep_relocs);
+        else
+                process_32(fp, as_text, as_bin, show_reloc_info, keep_relocs);
+        fclose(fp);
+        return 0;
+}