path: root/target/linux/cobalt/patches/001-no_module_reloc.patch

diff -urN linux-2.6.30.10/arch/mips/Makefile linux-2.6.30.10.new//arch/mips/Makefile
--- linux-2.6.30.10/arch/mips/Makefile	2010-01-29 16:12:01.000000000 +0100
+++ linux-2.6.30.10.new//arch/mips/Makefile	2009-12-04 07:00:07.000000000 +0100
@@ -83,7 +83,7 @@
 cflags-y			+= -G 0 -mno-abicalls -fno-pic -pipe
 cflags-y			+= -msoft-float
 LDFLAGS_vmlinux			+= -G 0 -static -n -nostdlib
-MODFLAGS			+= -mno-long-calls
+MODFLAGS			+= -mlong-calls
 
 cflags-y += -ffreestanding
 
diff -urN linux-2.6.30.10/arch/mips/include/asm/module.h linux-2.6.30.10.new//arch/mips/include/asm/module.h
--- linux-2.6.30.10/arch/mips/include/asm/module.h	2010-01-29 16:12:01.000000000 +0100
+++ linux-2.6.30.10.new//arch/mips/include/asm/module.h	2009-12-04 07:00:07.000000000 +0100
@@ -9,11 +9,6 @@
 	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.  */
diff -urN linux-2.6.30.10/arch/mips/kernel/module.c linux-2.6.30.10.new//arch/mips/kernel/module.c
--- linux-2.6.30.10/arch/mips/kernel/module.c	2010-01-29 16:12:01.000000000 +0100
+++ linux-2.6.30.10.new//arch/mips/kernel/module.c	2009-12-04 07:00:07.000000000 +0100
@@ -43,116 +43,6 @@
 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
@@ -168,101 +58,23 @@
 
 	return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL);
 #else
-	void *ptr;
-
 	if (size == 0)
 		return NULL;
-
-	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);
+	return vmalloc(size);
 #endif
 }
 
 /* Free memory returned from module_alloc */
 void module_free(struct module *mod, void *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);
-	}
+	vfree(module_region);
 	/* FIXME: If module_region == mod->init_region, trim exception
            table entries. */
 }
 
-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;
 }
 
@@ -285,37 +97,27 @@
 	return 0;
 }
 
-static Elf_Addr add_plt_entry_to(unsigned *plt_offset,
-				 void *start, Elf_Addr v)
+static int apply_r_mips_26_rel(struct module *me, u32 *location, Elf_Addr v)
 {
-	unsigned *tramp = start + *plt_offset;
-
-	*plt_offset += 4 * sizeof(int);
-
-	/* adjust carry for addiu */
-	if (v & 0x00008000)
-		v += 0x10000;
-
-	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 */
+	if (v % 4) {
+		printk(KERN_ERR "module %s: dangerous relocation\n", me->name);
+		return -ENOEXEC;
+	}
 
-	return (Elf_Addr) tramp;
-}
+	if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
+		printk(KERN_ERR
+		       "module %s: relocation overflow\n",
+		       me->name);
+		return -ENOEXEC;
+	}
 
-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);
+	*location = (*location & ~0x03ffffff) |
+	            ((*location + (v >> 2)) & 0x03ffffff);
 
+	return 0;
 }
 
-static int set_r_mips_26(struct module *me, u32 *location, u32 ofs, Elf_Addr v)
+static int apply_r_mips_26_rela(struct module *me, u32 *location, Elf_Addr v)
 {
 	if (v % 4) {
 		printk(KERN_ERR "module %s: dangerous relocation\n", me->name);
@@ -323,31 +125,17 @@
 	}
 
 	if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
-	    v = add_plt_entry(me, location, v + (ofs << 2));
-		if (!v) {
-			printk(KERN_ERR
+		printk(KERN_ERR
 		       "module %s: relocation overflow\n",
 		       me->name);
-			return -ENOEXEC;
-		}
-		ofs = 0;
+		return -ENOEXEC;
 	}
 
-	*location = (*location & ~0x03ffffff) | ((ofs + (v >> 2)) & 0x03ffffff);
+	*location = (*location & ~0x03ffffff) | ((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;
@@ -612,32 +400,11 @@
 		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);