mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-15 08:05:21 +02:00
a9dafde4e3
to achieve this, try to load kernel modules to KSEG0 and if that doesn't work, use vmalloc and fix up relocations with a jump table based on code from a kernel patch by MikroTik git-svn-id: svn://svn.openwrt.org/openwrt/trunk@16772 3c298f89-4303-0410-b956-a3cf2f4a3e73
326 lines
8.6 KiB
Diff
326 lines
8.6 KiB
Diff
--- a/arch/mips/Makefile
|
|
+++ b/arch/mips/Makefile
|
|
@@ -82,7 +82,7 @@ all-$(CONFIG_BOOT_ELF64) := $(vmlinux-64
|
|
cflags-y += -G 0 -mno-abicalls -fno-pic -pipe
|
|
cflags-y += -msoft-float
|
|
LDFLAGS_vmlinux += -G 0 -static -n -nostdlib
|
|
-MODFLAGS += -mlong-calls
|
|
+MODFLAGS += -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 *plt_tbl;
|
|
+ unsigned int core_plt_offset;
|
|
+ unsigned int core_plt_size;
|
|
+ unsigned int init_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
|
|
@@ -43,6 +43,114 @@ 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 Elf32_Ehdr *hdr, const Elf32_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;
|
|
+}
|
|
+
|
|
+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);
|
|
+}
|
|
+
|
|
+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
|
|
@@ -58,16 +166,41 @@ void *module_alloc(unsigned long size)
|
|
|
|
return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL);
|
|
#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)
|
|
+{
|
|
+ return (KSEGX(ptr) == KSEG0);
|
|
+}
|
|
+
|
|
/* 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);
|
|
+ }
|
|
/* FIXME: If module_region == mod->init_region, trim exception
|
|
table entries. */
|
|
}
|
|
@@ -75,6 +208,24 @@ void module_free(struct module *mod, voi
|
|
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.core_plt_offset = 0;
|
|
+ mod->arch.core_plt_size = core_size;
|
|
+ mod->arch.init_plt_offset = core_size;
|
|
+ mod->arch.plt_tbl = kmalloc(core_size + init_size, GFP_KERNEL);
|
|
+ if (!mod->arch.plt_tbl)
|
|
+ return -ENOMEM;
|
|
+
|
|
return 0;
|
|
}
|
|
|
|
@@ -97,45 +248,73 @@ 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, unsigned size, Elf_Addr v)
|
|
{
|
|
- if (v % 4) {
|
|
- printk(KERN_ERR "module %s: dangerous relocation\n", me->name);
|
|
- return -ENOEXEC;
|
|
- }
|
|
+ unsigned *tramp = start + *plt_offset;
|
|
|
|
- if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
|
|
- printk(KERN_ERR
|
|
- "module %s: relocation overflow\n",
|
|
- me->name);
|
|
- return -ENOEXEC;
|
|
- }
|
|
+ if (*plt_offset == size)
|
|
+ return 0;
|
|
+
|
|
+ *plt_offset += 4 * sizeof(int);
|
|
+
|
|
+ /* 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 (Elf_Addr) tramp;
|
|
+}
|
|
+
|
|
+static Elf_Addr add_plt_entry(struct module *me, void *location, Elf_Addr v)
|
|
+{
|
|
+ if (location >= me->module_core &&
|
|
+ location < me->module_core + me->core_size)
|
|
+ return add_plt_entry_to(&me->arch.core_plt_offset,
|
|
+ me->module_core, me->core_size, v);
|
|
+
|
|
+ if (location >= me->module_init &&
|
|
+ location < me->module_init + me->init_size)
|
|
+ return add_plt_entry_to(&me->arch.init_plt_offset,
|
|
+ me->module_init, me->init_size, v);
|
|
|
|
return 0;
|
|
}
|
|
|
|
-static int apply_r_mips_26_rela(struct module *me, u32 *location, Elf_Addr v)
|
|
+static int set_r_mips_26(struct module *me, u32 *location, u32 ofs, Elf_Addr v)
|
|
{
|
|
if (v % 4) {
|
|
printk(KERN_ERR "module %s: dangerous relocation\n", me->name);
|
|
return -ENOEXEC;
|
|
}
|
|
|
|
- if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
|
|
+ if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000) &&
|
|
+ ((v = add_plt_entry(me, location, v + (ofs << 2))) == 0)) {
|
|
printk(KERN_ERR
|
|
"module %s: relocation overflow\n",
|
|
me->name);
|
|
return -ENOEXEC;
|
|
}
|
|
|
|
- *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;
|
|
@@ -400,11 +579,23 @@ 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.core_plt_offset == 0 &&
|
|
+ me->arch.init_plt_offset == me->arch.core_plt_size &&
|
|
+ is_phys_addr(me->module_core)) {
|
|
+ kfree(me->arch.plt_tbl);
|
|
+ me->arch.plt_tbl = NULL;
|
|
+ }
|
|
+
|
|
return 0;
|
|
}
|
|
|
|
void module_arch_cleanup(struct module *mod)
|
|
{
|
|
+ if (mod->arch.plt_tbl)
|
|
+ kfree(mod->arch.plt_tbl);
|
|
spin_lock_irq(&dbe_lock);
|
|
list_del(&mod->arch.dbe_list);
|
|
spin_unlock_irq(&dbe_lock);
|