diff options
Diffstat (limited to 'target/linux/generic/patches-2.6.38/305-mips_module_reloc.patch')
| -rw-r--r-- | target/linux/generic/patches-2.6.38/305-mips_module_reloc.patch | 370 |
1 files changed, 370 insertions, 0 deletions
diff --git a/target/linux/generic/patches-2.6.38/305-mips_module_reloc.patch b/target/linux/generic/patches-2.6.38/305-mips_module_reloc.patch new file mode 100644 index 0000000000..5513962cb2 --- /dev/null +++ b/target/linux/generic/patches-2.6.38/305-mips_module_reloc.patch @@ -0,0 +1,370 @@ +--- a/arch/mips/Makefile ++++ b/arch/mips/Makefile +@@ -90,8 +90,8 @@ all-$(CONFIG_SYS_SUPPORTS_ZBOOT)+= vmlin + cflags-y += -G 0 -mno-abicalls -fno-pic -pipe + cflags-y += -msoft-float + LDFLAGS_vmlinux += -G 0 -static -n -nostdlib +-KBUILD_AFLAGS_MODULE += -mlong-calls +-KBUILD_CFLAGS_MODULE += -mlong-calls ++KBUILD_AFLAGS_MODULE += -mno-long-calls ++KBUILD_CFLAGS_MODULE += -mno-long-calls + + cflags-y += -ffreestanding + +--- a/arch/mips/include/asm/module.h ++++ b/arch/mips/include/asm/module.h +@@ -9,6 +9,11 @@ struct mod_arch_specific { + struct list_head dbe_list; + const struct exception_table_entry *dbe_start; + const struct exception_table_entry *dbe_end; ++ ++ void *phys_plt_tbl; ++ void *virt_plt_tbl; ++ unsigned int phys_plt_offset; ++ unsigned int virt_plt_offset; + }; + + typedef uint8_t Elf64_Byte; /* Type for a 8-bit quantity. */ +--- a/arch/mips/kernel/module.c ++++ b/arch/mips/kernel/module.c +@@ -45,6 +45,117 @@ static struct mips_hi16 *mips_hi16_list; + static LIST_HEAD(dbe_list); + static DEFINE_SPINLOCK(dbe_lock); + ++/* ++ * Get the potential max trampolines size required of the init and ++ * non-init sections. Only used if we cannot find enough contiguous ++ * physically mapped memory to put the module into. ++ */ ++static unsigned int ++get_plt_size(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs, ++ const char *secstrings, unsigned int symindex, bool is_init) ++{ ++ unsigned long ret = 0; ++ unsigned int i, j; ++ Elf_Sym *syms; ++ ++ /* Everything marked ALLOC (this includes the exported symbols) */ ++ for (i = 1; i < hdr->e_shnum; ++i) { ++ unsigned int info = sechdrs[i].sh_info; ++ ++ if (sechdrs[i].sh_type != SHT_REL ++ && sechdrs[i].sh_type != SHT_RELA) ++ continue; ++ ++ /* Not a valid relocation section? */ ++ if (info >= hdr->e_shnum) ++ continue; ++ ++ /* Don't bother with non-allocated sections */ ++ if (!(sechdrs[info].sh_flags & SHF_ALLOC)) ++ continue; ++ ++ /* If it's called *.init*, and we're not init, we're ++ not interested */ ++ if ((strstr(secstrings + sechdrs[i].sh_name, ".init") != 0) ++ != is_init) ++ continue; ++ ++ syms = (Elf_Sym *) sechdrs[symindex].sh_addr; ++ if (sechdrs[i].sh_type == SHT_REL) { ++ Elf_Mips_Rel *rel = (void *) sechdrs[i].sh_addr; ++ unsigned int size = sechdrs[i].sh_size / sizeof(*rel); ++ ++ for (j = 0; j < size; ++j) { ++ Elf_Sym *sym; ++ ++ if (ELF_MIPS_R_TYPE(rel[j]) != R_MIPS_26) ++ continue; ++ ++ sym = syms + ELF_MIPS_R_SYM(rel[j]); ++ if (!is_init && sym->st_shndx != SHN_UNDEF) ++ continue; ++ ++ ret += 4 * sizeof(int); ++ } ++ } else { ++ Elf_Mips_Rela *rela = (void *) sechdrs[i].sh_addr; ++ unsigned int size = sechdrs[i].sh_size / sizeof(*rela); ++ ++ for (j = 0; j < size; ++j) { ++ Elf_Sym *sym; ++ ++ if (ELF_MIPS_R_TYPE(rela[j]) != R_MIPS_26) ++ continue; ++ ++ sym = syms + ELF_MIPS_R_SYM(rela[j]); ++ if (!is_init && sym->st_shndx != SHN_UNDEF) ++ continue; ++ ++ ret += 4 * sizeof(int); ++ } ++ } ++ } ++ ++ return ret; ++} ++ ++#ifndef MODULE_START ++static void *alloc_phys(unsigned long size) ++{ ++ unsigned order; ++ struct page *page; ++ struct page *p; ++ ++ size = PAGE_ALIGN(size); ++ order = get_order(size); ++ ++ page = alloc_pages(GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN | ++ __GFP_THISNODE, order); ++ if (!page) ++ return NULL; ++ ++ split_page(page, order); ++ ++ for (p = page + (size >> PAGE_SHIFT); p < page + (1 << order); ++p) ++ __free_page(p); ++ ++ return page_address(page); ++} ++#endif ++ ++static void free_phys(void *ptr, unsigned long size) ++{ ++ struct page *page; ++ struct page *end; ++ ++ page = virt_to_page(ptr); ++ end = page + (PAGE_ALIGN(size) >> PAGE_SHIFT); ++ ++ for (; page < end; ++page) ++ __free_page(page); ++} ++ ++ + void *module_alloc(unsigned long size) + { + #ifdef MODULE_START +@@ -52,21 +163,99 @@ void *module_alloc(unsigned long size) + GFP_KERNEL, PAGE_KERNEL, -1, + __builtin_return_address(0)); + #else ++ void *ptr; ++ + if (size == 0) + return NULL; +- return vmalloc(size); ++ ++ ptr = alloc_phys(size); ++ ++ /* If we failed to allocate physically contiguous memory, ++ * fall back to regular vmalloc. The module loader code will ++ * create jump tables to handle long jumps */ ++ if (!ptr) ++ return vmalloc(size); ++ ++ return ptr; ++#endif ++} ++ ++static inline bool is_phys_addr(void *ptr) ++{ ++#ifdef CONFIG_64BIT ++ return (KSEGX((unsigned long)ptr) == CKSEG0); ++#else ++ return (KSEGX(ptr) == KSEG0); + #endif + } + + /* Free memory returned from module_alloc */ + void module_free(struct module *mod, void *module_region) + { +- vfree(module_region); ++ if (is_phys_addr(module_region)) { ++ if (mod->module_init == module_region) ++ free_phys(module_region, mod->init_size); ++ else if (mod->module_core == module_region) ++ free_phys(module_region, mod->core_size); ++ else ++ BUG(); ++ } else { ++ vfree(module_region); ++ } ++} ++ ++static void *__module_alloc(int size, bool phys) ++{ ++ void *ptr; ++ ++ if (phys) ++ ptr = kmalloc(size, GFP_KERNEL); ++ else ++ ptr = vmalloc(size); ++ return ptr; ++} ++ ++static void __module_free(void *ptr) ++{ ++ if (is_phys_addr(ptr)) ++ kfree(ptr); ++ else ++ vfree(ptr); + } + + int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, + char *secstrings, struct module *mod) + { ++ unsigned int symindex = 0; ++ unsigned int core_size, init_size; ++ int i; ++ ++ for (i = 1; i < hdr->e_shnum; i++) ++ if (sechdrs[i].sh_type == SHT_SYMTAB) ++ symindex = i; ++ ++ core_size = get_plt_size(hdr, sechdrs, secstrings, symindex, false); ++ init_size = get_plt_size(hdr, sechdrs, secstrings, symindex, true); ++ ++ mod->arch.phys_plt_offset = 0; ++ mod->arch.virt_plt_offset = 0; ++ mod->arch.phys_plt_tbl = NULL; ++ mod->arch.virt_plt_tbl = NULL; ++ ++ if ((core_size + init_size) == 0) ++ return 0; ++ ++ mod->arch.phys_plt_tbl = __module_alloc(core_size + init_size, 1); ++ if (!mod->arch.phys_plt_tbl) ++ return -ENOMEM; ++ ++ mod->arch.virt_plt_tbl = __module_alloc(core_size + init_size, 0); ++ if (!mod->arch.virt_plt_tbl) { ++ __module_free(mod->arch.phys_plt_tbl); ++ mod->arch.phys_plt_tbl = NULL; ++ return -ENOMEM; ++ } ++ + return 0; + } + +@@ -89,28 +278,36 @@ static int apply_r_mips_32_rela(struct m + return 0; + } + +-static int apply_r_mips_26_rel(struct module *me, u32 *location, Elf_Addr v) ++static Elf_Addr add_plt_entry_to(unsigned *plt_offset, ++ void *start, Elf_Addr v) + { +- if (v % 4) { +- pr_err("module %s: dangerous R_MIPS_26 REL relocation\n", +- me->name); +- return -ENOEXEC; +- } ++ unsigned *tramp = start + *plt_offset; ++ *plt_offset += 4 * sizeof(int); + +- if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) { +- printk(KERN_ERR +- "module %s: relocation overflow\n", +- me->name); +- return -ENOEXEC; +- } ++ /* adjust carry for addiu */ ++ if (v & 0x00008000) ++ v += 0x10000; + +- *location = (*location & ~0x03ffffff) | +- ((*location + (v >> 2)) & 0x03ffffff); ++ tramp[0] = 0x3c190000 | (v >> 16); /* lui t9, hi16 */ ++ tramp[1] = 0x27390000 | (v & 0xffff); /* addiu t9, t9, lo16 */ ++ tramp[2] = 0x03200008; /* jr t9 */ ++ tramp[3] = 0x00000000; /* nop */ + +- return 0; ++ return (Elf_Addr) tramp; + } + +-static int apply_r_mips_26_rela(struct module *me, u32 *location, Elf_Addr v) ++static Elf_Addr add_plt_entry(struct module *me, void *location, Elf_Addr v) ++{ ++ if (is_phys_addr(location)) ++ return add_plt_entry_to(&me->arch.phys_plt_offset, ++ me->arch.phys_plt_tbl, v); ++ else ++ return add_plt_entry_to(&me->arch.virt_plt_offset, ++ me->arch.virt_plt_tbl, v); ++ ++} ++ ++static int set_r_mips_26(struct module *me, u32 *location, u32 ofs, Elf_Addr v) + { + if (v % 4) { + pr_err("module %s: dangerous R_MIPS_26 RELArelocation\n", +@@ -119,17 +316,31 @@ static int apply_r_mips_26_rela(struct m + } + + if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) { +- printk(KERN_ERR ++ v = add_plt_entry(me, location, v + (ofs << 2)); ++ if (!v) { ++ printk(KERN_ERR + "module %s: relocation overflow\n", + me->name); +- return -ENOEXEC; ++ return -ENOEXEC; ++ } ++ ofs = 0; + } + +- *location = (*location & ~0x03ffffff) | ((v >> 2) & 0x03ffffff); ++ *location = (*location & ~0x03ffffff) | ((ofs + (v >> 2)) & 0x03ffffff); + + return 0; + } + ++static int apply_r_mips_26_rel(struct module *me, u32 *location, Elf_Addr v) ++{ ++ return set_r_mips_26(me, location, *location & 0x03ffffff, v); ++} ++ ++static int apply_r_mips_26_rela(struct module *me, u32 *location, Elf_Addr v) ++{ ++ return set_r_mips_26(me, location, 0, v); ++} ++ + static int apply_r_mips_hi16_rel(struct module *me, u32 *location, Elf_Addr v) + { + struct mips_hi16 *n; +@@ -397,11 +608,32 @@ int module_finalize(const Elf_Ehdr *hdr, + list_add(&me->arch.dbe_list, &dbe_list); + spin_unlock_irq(&dbe_lock); + } ++ ++ /* Get rid of the fixup trampoline if we're running the module ++ * from physically mapped address space */ ++ if (me->arch.phys_plt_offset == 0) { ++ __module_free(me->arch.phys_plt_tbl); ++ me->arch.phys_plt_tbl = NULL; ++ } ++ if (me->arch.virt_plt_offset == 0) { ++ __module_free(me->arch.virt_plt_tbl); ++ me->arch.virt_plt_tbl = NULL; ++ } ++ + return 0; + } + + void module_arch_cleanup(struct module *mod) + { ++ if (mod->arch.phys_plt_tbl) { ++ __module_free(mod->arch.phys_plt_tbl); ++ mod->arch.phys_plt_tbl = NULL; ++ } ++ if (mod->arch.virt_plt_tbl) { ++ __module_free(mod->arch.virt_plt_tbl); ++ mod->arch.virt_plt_tbl = NULL; ++ } ++ + spin_lock_irq(&dbe_lock); + list_del(&mod->arch.dbe_list); + spin_unlock_irq(&dbe_lock); |