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xianfeng |
/* Kernel module help for PPC64.
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Copyright (C) 2001, 2003 Rusty Russell IBM Corporation.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/elf.h>
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#include <linux/moduleloader.h>
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#include <linux/err.h>
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#include <linux/vmalloc.h>
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#include <linux/bug.h>
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#include <asm/module.h>
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#include <asm/uaccess.h>
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#include <asm/firmware.h>
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#include "setup.h"
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/* FIXME: We don't do .init separately. To do this, we'd need to have
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a separate r2 value in the init and core section, and stub between
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them, too.
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Using a magic allocator which places modules within 32MB solves
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this, and makes other things simpler. Anton?
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--RR. */
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#if 0
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#define DEBUGP printk
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#else
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#define DEBUGP(fmt , ...)
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#endif
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/* There's actually a third entry here, but it's unused */
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struct ppc64_opd_entry
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{
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unsigned long funcaddr;
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unsigned long r2;
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};
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/* Like PPC32, we need little trampolines to do > 24-bit jumps (into
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the kernel itself). But on PPC64, these need to be used for every
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jump, actually, to reset r2 (TOC+0x8000). */
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struct ppc64_stub_entry
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{
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/* 28 byte jump instruction sequence (7 instructions) */
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unsigned char jump[28];
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unsigned char unused[4];
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/* Data for the above code */
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struct ppc64_opd_entry opd;
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};
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/* We use a stub to fix up r2 (TOC ptr) and to jump to the (external)
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function which may be more than 24-bits away. We could simply
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patch the new r2 value and function pointer into the stub, but it's
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significantly shorter to put these values at the end of the stub
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code, and patch the stub address (32-bits relative to the TOC ptr,
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r2) into the stub. */
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static struct ppc64_stub_entry ppc64_stub =
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{ .jump = {
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0x3d, 0x82, 0x00, 0x00, /* addis r12,r2, <high> */
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0x39, 0x8c, 0x00, 0x00, /* addi r12,r12, <low> */
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/* Save current r2 value in magic place on the stack. */
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0xf8, 0x41, 0x00, 0x28, /* std r2,40(r1) */
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0xe9, 0x6c, 0x00, 0x20, /* ld r11,32(r12) */
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0xe8, 0x4c, 0x00, 0x28, /* ld r2,40(r12) */
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0x7d, 0x69, 0x03, 0xa6, /* mtctr r11 */
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0x4e, 0x80, 0x04, 0x20 /* bctr */
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} };
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/* Count how many different 24-bit relocations (different symbol,
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different addend) */
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static unsigned int count_relocs(const Elf64_Rela *rela, unsigned int num)
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{
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unsigned int i, j, ret = 0;
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/* FIXME: Only count external ones --RR */
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/* Sure, this is order(n^2), but it's usually short, and not
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time critical */
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for (i = 0; i < num; i++) {
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/* Only count 24-bit relocs, others don't need stubs */
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if (ELF64_R_TYPE(rela[i].r_info) != R_PPC_REL24)
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continue;
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for (j = 0; j < i; j++) {
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/* If this addend appeared before, it's
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already been counted */
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if (rela[i].r_info == rela[j].r_info
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&& rela[i].r_addend == rela[j].r_addend)
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break;
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}
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if (j == i) ret++;
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}
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return ret;
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}
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void *module_alloc(unsigned long size)
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{
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if (size == 0)
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return NULL;
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return vmalloc_exec(size);
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}
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/* Free memory returned from module_alloc */
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void module_free(struct module *mod, void *module_region)
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{
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vfree(module_region);
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/* FIXME: If module_region == mod->init_region, trim exception
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table entries. */
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}
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/* Get size of potential trampolines required. */
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static unsigned long get_stubs_size(const Elf64_Ehdr *hdr,
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const Elf64_Shdr *sechdrs)
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{
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/* One extra reloc so it's always 0-funcaddr terminated */
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unsigned long relocs = 1;
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unsigned i;
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/* Every relocated section... */
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for (i = 1; i < hdr->e_shnum; i++) {
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if (sechdrs[i].sh_type == SHT_RELA) {
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DEBUGP("Found relocations in section %u\n", i);
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DEBUGP("Ptr: %p. Number: %lu\n",
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(void *)sechdrs[i].sh_addr,
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sechdrs[i].sh_size / sizeof(Elf64_Rela));
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relocs += count_relocs((void *)sechdrs[i].sh_addr,
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sechdrs[i].sh_size
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/ sizeof(Elf64_Rela));
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}
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}
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DEBUGP("Looks like a total of %lu stubs, max\n", relocs);
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return relocs * sizeof(struct ppc64_stub_entry);
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}
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static void dedotify_versions(struct modversion_info *vers,
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unsigned long size)
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{
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struct modversion_info *end;
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for (end = (void *)vers + size; vers < end; vers++)
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if (vers->name[0] == '.')
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memmove(vers->name, vers->name+1, strlen(vers->name));
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}
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/* Undefined symbols which refer to .funcname, hack to funcname */
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static void dedotify(Elf64_Sym *syms, unsigned int numsyms, char *strtab)
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{
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unsigned int i;
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for (i = 1; i < numsyms; i++) {
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if (syms[i].st_shndx == SHN_UNDEF) {
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char *name = strtab + syms[i].st_name;
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if (name[0] == '.')
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memmove(name, name+1, strlen(name));
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}
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}
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}
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int module_frob_arch_sections(Elf64_Ehdr *hdr,
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Elf64_Shdr *sechdrs,
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char *secstrings,
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struct module *me)
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{
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unsigned int i;
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/* Find .toc and .stubs sections, symtab and strtab */
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for (i = 1; i < hdr->e_shnum; i++) {
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char *p;
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if (strcmp(secstrings + sechdrs[i].sh_name, ".stubs") == 0)
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me->arch.stubs_section = i;
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else if (strcmp(secstrings + sechdrs[i].sh_name, ".toc") == 0)
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me->arch.toc_section = i;
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else if (strcmp(secstrings+sechdrs[i].sh_name,"__versions")==0)
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dedotify_versions((void *)hdr + sechdrs[i].sh_offset,
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sechdrs[i].sh_size);
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/* We don't handle .init for the moment: rename to _init */
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while ((p = strstr(secstrings + sechdrs[i].sh_name, ".init")))
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p[0] = '_';
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if (sechdrs[i].sh_type == SHT_SYMTAB)
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dedotify((void *)hdr + sechdrs[i].sh_offset,
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sechdrs[i].sh_size / sizeof(Elf64_Sym),
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(void *)hdr
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+ sechdrs[sechdrs[i].sh_link].sh_offset);
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}
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if (!me->arch.stubs_section) {
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printk("%s: doesn't contain .stubs.\n", me->name);
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return -ENOEXEC;
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}
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/* If we don't have a .toc, just use .stubs. We need to set r2
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to some reasonable value in case the module calls out to
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other functions via a stub, or if a function pointer escapes
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the module by some means. */
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if (!me->arch.toc_section)
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me->arch.toc_section = me->arch.stubs_section;
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/* Override the stubs size */
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sechdrs[me->arch.stubs_section].sh_size = get_stubs_size(hdr, sechdrs);
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return 0;
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}
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int apply_relocate(Elf64_Shdr *sechdrs,
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const char *strtab,
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unsigned int symindex,
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unsigned int relsec,
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struct module *me)
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{
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printk(KERN_ERR "%s: Non-ADD RELOCATION unsupported\n", me->name);
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return -ENOEXEC;
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}
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/* r2 is the TOC pointer: it actually points 0x8000 into the TOC (this
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gives the value maximum span in an instruction which uses a signed
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offset) */
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static inline unsigned long my_r2(Elf64_Shdr *sechdrs, struct module *me)
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{
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return sechdrs[me->arch.toc_section].sh_addr + 0x8000;
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}
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/* Both low and high 16 bits are added as SIGNED additions, so if low
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16 bits has high bit set, high 16 bits must be adjusted. These
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macros do that (stolen from binutils). */
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#define PPC_LO(v) ((v) & 0xffff)
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#define PPC_HI(v) (((v) >> 16) & 0xffff)
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#define PPC_HA(v) PPC_HI ((v) + 0x8000)
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/* Patch stub to reference function and correct r2 value. */
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static inline int create_stub(Elf64_Shdr *sechdrs,
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struct ppc64_stub_entry *entry,
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struct ppc64_opd_entry *opd,
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struct module *me)
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{
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Elf64_Half *loc1, *loc2;
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long reladdr;
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*entry = ppc64_stub;
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loc1 = (Elf64_Half *)&entry->jump[2];
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loc2 = (Elf64_Half *)&entry->jump[6];
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/* Stub uses address relative to r2. */
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reladdr = (unsigned long)entry - my_r2(sechdrs, me);
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if (reladdr > 0x7FFFFFFF || reladdr < -(0x80000000L)) {
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printk("%s: Address %p of stub out of range of %p.\n",
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me->name, (void *)reladdr, (void *)my_r2);
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return 0;
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| 261 |
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}
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| 262 |
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DEBUGP("Stub %p get data from reladdr %li\n", entry, reladdr);
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| 264 |
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*loc1 = PPC_HA(reladdr);
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*loc2 = PPC_LO(reladdr);
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entry->opd.funcaddr = opd->funcaddr;
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| 267 |
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entry->opd.r2 = opd->r2;
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| 268 |
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return 1;
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}
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| 270 |
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| 271 |
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/* Create stub to jump to function described in this OPD: we need the
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| 272 |
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stub to set up the TOC ptr (r2) for the function. */
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| 273 |
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static unsigned long stub_for_addr(Elf64_Shdr *sechdrs,
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| 274 |
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unsigned long opdaddr,
|
| 275 |
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struct module *me)
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| 276 |
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{
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| 277 |
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struct ppc64_stub_entry *stubs;
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| 278 |
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struct ppc64_opd_entry *opd = (void *)opdaddr;
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| 279 |
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unsigned int i, num_stubs;
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| 280 |
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| 281 |
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num_stubs = sechdrs[me->arch.stubs_section].sh_size / sizeof(*stubs);
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| 282 |
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| 283 |
|
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/* Find this stub, or if that fails, the next avail. entry */
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| 284 |
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stubs = (void *)sechdrs[me->arch.stubs_section].sh_addr;
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| 285 |
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for (i = 0; stubs[i].opd.funcaddr; i++) {
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| 286 |
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BUG_ON(i >= num_stubs);
|
| 287 |
|
|
|
| 288 |
|
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if (stubs[i].opd.funcaddr == opd->funcaddr)
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| 289 |
|
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return (unsigned long)&stubs[i];
|
| 290 |
|
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}
|
| 291 |
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| 292 |
|
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if (!create_stub(sechdrs, &stubs[i], opd, me))
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| 293 |
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return 0;
|
| 294 |
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| 295 |
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return (unsigned long)&stubs[i];
|
| 296 |
|
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}
|
| 297 |
|
|
|
| 298 |
|
|
/* We expect a noop next: if it is, replace it with instruction to
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| 299 |
|
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restore r2. */
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| 300 |
|
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static int restore_r2(u32 *instruction, struct module *me)
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| 301 |
|
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{
|
| 302 |
|
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if (*instruction != 0x60000000) {
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| 303 |
|
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printk("%s: Expect noop after relocate, got %08x\n",
|
| 304 |
|
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me->name, *instruction);
|
| 305 |
|
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return 0;
|
| 306 |
|
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}
|
| 307 |
|
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*instruction = 0xe8410028; /* ld r2,40(r1) */
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| 308 |
|
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return 1;
|
| 309 |
|
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}
|
| 310 |
|
|
|
| 311 |
|
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int apply_relocate_add(Elf64_Shdr *sechdrs,
|
| 312 |
|
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const char *strtab,
|
| 313 |
|
|
unsigned int symindex,
|
| 314 |
|
|
unsigned int relsec,
|
| 315 |
|
|
struct module *me)
|
| 316 |
|
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{
|
| 317 |
|
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unsigned int i;
|
| 318 |
|
|
Elf64_Rela *rela = (void *)sechdrs[relsec].sh_addr;
|
| 319 |
|
|
Elf64_Sym *sym;
|
| 320 |
|
|
unsigned long *location;
|
| 321 |
|
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unsigned long value;
|
| 322 |
|
|
|
| 323 |
|
|
DEBUGP("Applying ADD relocate section %u to %u\n", relsec,
|
| 324 |
|
|
sechdrs[relsec].sh_info);
|
| 325 |
|
|
for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
|
| 326 |
|
|
/* This is where to make the change */
|
| 327 |
|
|
location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
|
| 328 |
|
|
+ rela[i].r_offset;
|
| 329 |
|
|
/* This is the symbol it is referring to */
|
| 330 |
|
|
sym = (Elf64_Sym *)sechdrs[symindex].sh_addr
|
| 331 |
|
|
+ ELF64_R_SYM(rela[i].r_info);
|
| 332 |
|
|
|
| 333 |
|
|
DEBUGP("RELOC at %p: %li-type as %s (%lu) + %li\n",
|
| 334 |
|
|
location, (long)ELF64_R_TYPE(rela[i].r_info),
|
| 335 |
|
|
strtab + sym->st_name, (unsigned long)sym->st_value,
|
| 336 |
|
|
(long)rela[i].r_addend);
|
| 337 |
|
|
|
| 338 |
|
|
/* `Everything is relative'. */
|
| 339 |
|
|
value = sym->st_value + rela[i].r_addend;
|
| 340 |
|
|
|
| 341 |
|
|
switch (ELF64_R_TYPE(rela[i].r_info)) {
|
| 342 |
|
|
case R_PPC64_ADDR32:
|
| 343 |
|
|
/* Simply set it */
|
| 344 |
|
|
*(u32 *)location = value;
|
| 345 |
|
|
break;
|
| 346 |
|
|
|
| 347 |
|
|
case R_PPC64_ADDR64:
|
| 348 |
|
|
/* Simply set it */
|
| 349 |
|
|
*(unsigned long *)location = value;
|
| 350 |
|
|
break;
|
| 351 |
|
|
|
| 352 |
|
|
case R_PPC64_TOC:
|
| 353 |
|
|
*(unsigned long *)location = my_r2(sechdrs, me);
|
| 354 |
|
|
break;
|
| 355 |
|
|
|
| 356 |
|
|
case R_PPC64_TOC16:
|
| 357 |
|
|
/* Subtract TOC pointer */
|
| 358 |
|
|
value -= my_r2(sechdrs, me);
|
| 359 |
|
|
if (value + 0x8000 > 0xffff) {
|
| 360 |
|
|
printk("%s: bad TOC16 relocation (%lu)\n",
|
| 361 |
|
|
me->name, value);
|
| 362 |
|
|
return -ENOEXEC;
|
| 363 |
|
|
}
|
| 364 |
|
|
*((uint16_t *) location)
|
| 365 |
|
|
= (*((uint16_t *) location) & ~0xffff)
|
| 366 |
|
|
| (value & 0xffff);
|
| 367 |
|
|
break;
|
| 368 |
|
|
|
| 369 |
|
|
case R_PPC64_TOC16_DS:
|
| 370 |
|
|
/* Subtract TOC pointer */
|
| 371 |
|
|
value -= my_r2(sechdrs, me);
|
| 372 |
|
|
if ((value & 3) != 0 || value + 0x8000 > 0xffff) {
|
| 373 |
|
|
printk("%s: bad TOC16_DS relocation (%lu)\n",
|
| 374 |
|
|
me->name, value);
|
| 375 |
|
|
return -ENOEXEC;
|
| 376 |
|
|
}
|
| 377 |
|
|
*((uint16_t *) location)
|
| 378 |
|
|
= (*((uint16_t *) location) & ~0xfffc)
|
| 379 |
|
|
| (value & 0xfffc);
|
| 380 |
|
|
break;
|
| 381 |
|
|
|
| 382 |
|
|
case R_PPC_REL24:
|
| 383 |
|
|
/* FIXME: Handle weak symbols here --RR */
|
| 384 |
|
|
if (sym->st_shndx == SHN_UNDEF) {
|
| 385 |
|
|
/* External: go via stub */
|
| 386 |
|
|
value = stub_for_addr(sechdrs, value, me);
|
| 387 |
|
|
if (!value)
|
| 388 |
|
|
return -ENOENT;
|
| 389 |
|
|
if (!restore_r2((u32 *)location + 1, me))
|
| 390 |
|
|
return -ENOEXEC;
|
| 391 |
|
|
}
|
| 392 |
|
|
|
| 393 |
|
|
/* Convert value to relative */
|
| 394 |
|
|
value -= (unsigned long)location;
|
| 395 |
|
|
if (value + 0x2000000 > 0x3ffffff || (value & 3) != 0){
|
| 396 |
|
|
printk("%s: REL24 %li out of range!\n",
|
| 397 |
|
|
me->name, (long int)value);
|
| 398 |
|
|
return -ENOEXEC;
|
| 399 |
|
|
}
|
| 400 |
|
|
|
| 401 |
|
|
/* Only replace bits 2 through 26 */
|
| 402 |
|
|
*(uint32_t *)location
|
| 403 |
|
|
= (*(uint32_t *)location & ~0x03fffffc)
|
| 404 |
|
|
| (value & 0x03fffffc);
|
| 405 |
|
|
break;
|
| 406 |
|
|
|
| 407 |
|
|
case R_PPC64_REL64:
|
| 408 |
|
|
/* 64 bits relative (used by features fixups) */
|
| 409 |
|
|
*location = value - (unsigned long)location;
|
| 410 |
|
|
break;
|
| 411 |
|
|
|
| 412 |
|
|
default:
|
| 413 |
|
|
printk("%s: Unknown ADD relocation: %lu\n",
|
| 414 |
|
|
me->name,
|
| 415 |
|
|
(unsigned long)ELF64_R_TYPE(rela[i].r_info));
|
| 416 |
|
|
return -ENOEXEC;
|
| 417 |
|
|
}
|
| 418 |
|
|
}
|
| 419 |
|
|
|
| 420 |
|
|
return 0;
|
| 421 |
|
|
}
|
| 422 |
|
|
|
| 423 |
|
|
LIST_HEAD(module_bug_list);
|
| 424 |
|
|
|
| 425 |
|
|
static const Elf_Shdr *find_section(const Elf_Ehdr *hdr,
|
| 426 |
|
|
const Elf_Shdr *sechdrs,
|
| 427 |
|
|
const char *name)
|
| 428 |
|
|
{
|
| 429 |
|
|
char *secstrings;
|
| 430 |
|
|
unsigned int i;
|
| 431 |
|
|
|
| 432 |
|
|
secstrings = (char *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
|
| 433 |
|
|
for (i = 1; i < hdr->e_shnum; i++)
|
| 434 |
|
|
if (strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
|
| 435 |
|
|
return &sechdrs[i];
|
| 436 |
|
|
return NULL;
|
| 437 |
|
|
}
|
| 438 |
|
|
|
| 439 |
|
|
int module_finalize(const Elf_Ehdr *hdr,
|
| 440 |
|
|
const Elf_Shdr *sechdrs, struct module *me)
|
| 441 |
|
|
{
|
| 442 |
|
|
const Elf_Shdr *sect;
|
| 443 |
|
|
int err;
|
| 444 |
|
|
|
| 445 |
|
|
err = module_bug_finalize(hdr, sechdrs, me);
|
| 446 |
|
|
if (err)
|
| 447 |
|
|
return err;
|
| 448 |
|
|
|
| 449 |
|
|
/* Apply feature fixups */
|
| 450 |
|
|
sect = find_section(hdr, sechdrs, "__ftr_fixup");
|
| 451 |
|
|
if (sect != NULL)
|
| 452 |
|
|
do_feature_fixups(cur_cpu_spec->cpu_features,
|
| 453 |
|
|
(void *)sect->sh_addr,
|
| 454 |
|
|
(void *)sect->sh_addr + sect->sh_size);
|
| 455 |
|
|
|
| 456 |
|
|
sect = find_section(hdr, sechdrs, "__fw_ftr_fixup");
|
| 457 |
|
|
if (sect != NULL)
|
| 458 |
|
|
do_feature_fixups(powerpc_firmware_features,
|
| 459 |
|
|
(void *)sect->sh_addr,
|
| 460 |
|
|
(void *)sect->sh_addr + sect->sh_size);
|
| 461 |
|
|
|
| 462 |
|
|
return 0;
|
| 463 |
|
|
}
|
| 464 |
|
|
|
| 465 |
|
|
void module_arch_cleanup(struct module *mod)
|
| 466 |
|
|
{
|
| 467 |
|
|
module_bug_cleanup(mod);
|
| 468 |
|
|
}
|
| 469 |
|
|
|
| 470 |
|
|
struct bug_entry *module_find_bug(unsigned long bugaddr)
|
| 471 |
|
|
{
|
| 472 |
|
|
struct mod_arch_specific *mod;
|
| 473 |
|
|
unsigned int i;
|
| 474 |
|
|
struct bug_entry *bug;
|
| 475 |
|
|
|
| 476 |
|
|
list_for_each_entry(mod, &module_bug_list, bug_list) {
|
| 477 |
|
|
bug = mod->bug_table;
|
| 478 |
|
|
for (i = 0; i < mod->num_bugs; ++i, ++bug)
|
| 479 |
|
|
if (bugaddr == bug->bug_addr)
|
| 480 |
|
|
return bug;
|
| 481 |
|
|
}
|
| 482 |
|
|
return NULL;
|
| 483 |
|
|
}
|
