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-rw-r--r--arch/ppc64/kernel/module.c455
1 files changed, 0 insertions, 455 deletions
diff --git a/arch/ppc64/kernel/module.c b/arch/ppc64/kernel/module.c
deleted file mode 100644
index 928b8581fcb..00000000000
--- a/arch/ppc64/kernel/module.c
+++ /dev/null
@@ -1,455 +0,0 @@
-/* Kernel module help for PPC64.
- Copyright (C) 2001, 2003 Rusty Russell IBM Corporation.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-*/
-#include <linux/module.h>
-#include <linux/elf.h>
-#include <linux/moduleloader.h>
-#include <linux/err.h>
-#include <linux/vmalloc.h>
-#include <asm/module.h>
-#include <asm/uaccess.h>
-
-/* FIXME: We don't do .init separately. To do this, we'd need to have
- a separate r2 value in the init and core section, and stub between
- them, too.
-
- Using a magic allocator which places modules within 32MB solves
- this, and makes other things simpler. Anton?
- --RR. */
-#if 0
-#define DEBUGP printk
-#else
-#define DEBUGP(fmt , ...)
-#endif
-
-/* There's actually a third entry here, but it's unused */
-struct ppc64_opd_entry
-{
- unsigned long funcaddr;
- unsigned long r2;
-};
-
-/* Like PPC32, we need little trampolines to do > 24-bit jumps (into
- the kernel itself). But on PPC64, these need to be used for every
- jump, actually, to reset r2 (TOC+0x8000). */
-struct ppc64_stub_entry
-{
- /* 28 byte jump instruction sequence (7 instructions) */
- unsigned char jump[28];
- unsigned char unused[4];
- /* Data for the above code */
- struct ppc64_opd_entry opd;
-};
-
-/* We use a stub to fix up r2 (TOC ptr) and to jump to the (external)
- function which may be more than 24-bits away. We could simply
- patch the new r2 value and function pointer into the stub, but it's
- significantly shorter to put these values at the end of the stub
- code, and patch the stub address (32-bits relative to the TOC ptr,
- r2) into the stub. */
-static struct ppc64_stub_entry ppc64_stub =
-{ .jump = {
- 0x3d, 0x82, 0x00, 0x00, /* addis r12,r2, <high> */
- 0x39, 0x8c, 0x00, 0x00, /* addi r12,r12, <low> */
- /* Save current r2 value in magic place on the stack. */
- 0xf8, 0x41, 0x00, 0x28, /* std r2,40(r1) */
- 0xe9, 0x6c, 0x00, 0x20, /* ld r11,32(r12) */
- 0xe8, 0x4c, 0x00, 0x28, /* ld r2,40(r12) */
- 0x7d, 0x69, 0x03, 0xa6, /* mtctr r11 */
- 0x4e, 0x80, 0x04, 0x20 /* bctr */
-} };
-
-/* Count how many different 24-bit relocations (different symbol,
- different addend) */
-static unsigned int count_relocs(const Elf64_Rela *rela, unsigned int num)
-{
- unsigned int i, j, ret = 0;
-
- /* FIXME: Only count external ones --RR */
- /* Sure, this is order(n^2), but it's usually short, and not
- time critical */
- for (i = 0; i < num; i++) {
- /* Only count 24-bit relocs, others don't need stubs */
- if (ELF64_R_TYPE(rela[i].r_info) != R_PPC_REL24)
- continue;
- for (j = 0; j < i; j++) {
- /* If this addend appeared before, it's
- already been counted */
- if (rela[i].r_info == rela[j].r_info
- && rela[i].r_addend == rela[j].r_addend)
- break;
- }
- if (j == i) ret++;
- }
- return ret;
-}
-
-void *module_alloc(unsigned long size)
-{
- if (size == 0)
- return NULL;
-
- return vmalloc_exec(size);
-}
-
-/* Free memory returned from module_alloc */
-void module_free(struct module *mod, void *module_region)
-{
- vfree(module_region);
- /* FIXME: If module_region == mod->init_region, trim exception
- table entries. */
-}
-
-/* Get size of potential trampolines required. */
-static unsigned long get_stubs_size(const Elf64_Ehdr *hdr,
- const Elf64_Shdr *sechdrs)
-{
- /* One extra reloc so it's always 0-funcaddr terminated */
- unsigned long relocs = 1;
- unsigned i;
-
- /* Every relocated section... */
- for (i = 1; i < hdr->e_shnum; i++) {
- if (sechdrs[i].sh_type == SHT_RELA) {
- DEBUGP("Found relocations in section %u\n", i);
- DEBUGP("Ptr: %p. Number: %lu\n",
- (void *)sechdrs[i].sh_addr,
- sechdrs[i].sh_size / sizeof(Elf64_Rela));
- relocs += count_relocs((void *)sechdrs[i].sh_addr,
- sechdrs[i].sh_size
- / sizeof(Elf64_Rela));
- }
- }
-
- DEBUGP("Looks like a total of %lu stubs, max\n", relocs);
- return relocs * sizeof(struct ppc64_stub_entry);
-}
-
-static void dedotify_versions(struct modversion_info *vers,
- unsigned long size)
-{
- struct modversion_info *end;
-
- for (end = (void *)vers + size; vers < end; vers++)
- if (vers->name[0] == '.')
- memmove(vers->name, vers->name+1, strlen(vers->name));
-}
-
-/* Undefined symbols which refer to .funcname, hack to funcname */
-static void dedotify(Elf64_Sym *syms, unsigned int numsyms, char *strtab)
-{
- unsigned int i;
-
- for (i = 1; i < numsyms; i++) {
- if (syms[i].st_shndx == SHN_UNDEF) {
- char *name = strtab + syms[i].st_name;
- if (name[0] == '.')
- memmove(name, name+1, strlen(name));
- }
- }
-}
-
-int module_frob_arch_sections(Elf64_Ehdr *hdr,
- Elf64_Shdr *sechdrs,
- char *secstrings,
- struct module *me)
-{
- unsigned int i;
-
- /* Find .toc and .stubs sections, symtab and strtab */
- for (i = 1; i < hdr->e_shnum; i++) {
- char *p;
- if (strcmp(secstrings + sechdrs[i].sh_name, ".stubs") == 0)
- me->arch.stubs_section = i;
- else if (strcmp(secstrings + sechdrs[i].sh_name, ".toc") == 0)
- me->arch.toc_section = i;
- else if (strcmp(secstrings+sechdrs[i].sh_name,"__versions")==0)
- dedotify_versions((void *)hdr + sechdrs[i].sh_offset,
- sechdrs[i].sh_size);
-
- /* We don't handle .init for the moment: rename to _init */
- while ((p = strstr(secstrings + sechdrs[i].sh_name, ".init")))
- p[0] = '_';
-
- if (sechdrs[i].sh_type == SHT_SYMTAB)
- dedotify((void *)hdr + sechdrs[i].sh_offset,
- sechdrs[i].sh_size / sizeof(Elf64_Sym),
- (void *)hdr
- + sechdrs[sechdrs[i].sh_link].sh_offset);
- }
- if (!me->arch.stubs_section || !me->arch.toc_section) {
- printk("%s: doesn't contain .toc or .stubs.\n", me->name);
- return -ENOEXEC;
- }
-
- /* Override the stubs size */
- sechdrs[me->arch.stubs_section].sh_size = get_stubs_size(hdr, sechdrs);
- return 0;
-}
-
-int apply_relocate(Elf64_Shdr *sechdrs,
- const char *strtab,
- unsigned int symindex,
- unsigned int relsec,
- struct module *me)
-{
- printk(KERN_ERR "%s: Non-ADD RELOCATION unsupported\n", me->name);
- return -ENOEXEC;
-}
-
-/* r2 is the TOC pointer: it actually points 0x8000 into the TOC (this
- gives the value maximum span in an instruction which uses a signed
- offset) */
-static inline unsigned long my_r2(Elf64_Shdr *sechdrs, struct module *me)
-{
- return sechdrs[me->arch.toc_section].sh_addr + 0x8000;
-}
-
-/* Both low and high 16 bits are added as SIGNED additions, so if low
- 16 bits has high bit set, high 16 bits must be adjusted. These
- macros do that (stolen from binutils). */
-#define PPC_LO(v) ((v) & 0xffff)
-#define PPC_HI(v) (((v) >> 16) & 0xffff)
-#define PPC_HA(v) PPC_HI ((v) + 0x8000)
-
-/* Patch stub to reference function and correct r2 value. */
-static inline int create_stub(Elf64_Shdr *sechdrs,
- struct ppc64_stub_entry *entry,
- struct ppc64_opd_entry *opd,
- struct module *me)
-{
- Elf64_Half *loc1, *loc2;
- long reladdr;
-
- *entry = ppc64_stub;
-
- loc1 = (Elf64_Half *)&entry->jump[2];
- loc2 = (Elf64_Half *)&entry->jump[6];
-
- /* Stub uses address relative to r2. */
- reladdr = (unsigned long)entry - my_r2(sechdrs, me);
- if (reladdr > 0x7FFFFFFF || reladdr < -(0x80000000L)) {
- printk("%s: Address %p of stub out of range of %p.\n",
- me->name, (void *)reladdr, (void *)my_r2);
- return 0;
- }
- DEBUGP("Stub %p get data from reladdr %li\n", entry, reladdr);
-
- *loc1 = PPC_HA(reladdr);
- *loc2 = PPC_LO(reladdr);
- entry->opd.funcaddr = opd->funcaddr;
- entry->opd.r2 = opd->r2;
- return 1;
-}
-
-/* Create stub to jump to function described in this OPD: we need the
- stub to set up the TOC ptr (r2) for the function. */
-static unsigned long stub_for_addr(Elf64_Shdr *sechdrs,
- unsigned long opdaddr,
- struct module *me)
-{
- struct ppc64_stub_entry *stubs;
- struct ppc64_opd_entry *opd = (void *)opdaddr;
- unsigned int i, num_stubs;
-
- num_stubs = sechdrs[me->arch.stubs_section].sh_size / sizeof(*stubs);
-
- /* Find this stub, or if that fails, the next avail. entry */
- stubs = (void *)sechdrs[me->arch.stubs_section].sh_addr;
- for (i = 0; stubs[i].opd.funcaddr; i++) {
- BUG_ON(i >= num_stubs);
-
- if (stubs[i].opd.funcaddr == opd->funcaddr)
- return (unsigned long)&stubs[i];
- }
-
- if (!create_stub(sechdrs, &stubs[i], opd, me))
- return 0;
-
- return (unsigned long)&stubs[i];
-}
-
-/* We expect a noop next: if it is, replace it with instruction to
- restore r2. */
-static int restore_r2(u32 *instruction, struct module *me)
-{
- if (*instruction != 0x60000000) {
- printk("%s: Expect noop after relocate, got %08x\n",
- me->name, *instruction);
- return 0;
- }
- *instruction = 0xe8410028; /* ld r2,40(r1) */
- return 1;
-}
-
-int apply_relocate_add(Elf64_Shdr *sechdrs,
- const char *strtab,
- unsigned int symindex,
- unsigned int relsec,
- struct module *me)
-{
- unsigned int i;
- Elf64_Rela *rela = (void *)sechdrs[relsec].sh_addr;
- Elf64_Sym *sym;
- unsigned long *location;
- unsigned long value;
-
- DEBUGP("Applying ADD relocate section %u to %u\n", relsec,
- sechdrs[relsec].sh_info);
- for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
- /* This is where to make the change */
- location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
- + rela[i].r_offset;
- /* This is the symbol it is referring to */
- sym = (Elf64_Sym *)sechdrs[symindex].sh_addr
- + ELF64_R_SYM(rela[i].r_info);
-
- DEBUGP("RELOC at %p: %li-type as %s (%lu) + %li\n",
- location, (long)ELF64_R_TYPE(rela[i].r_info),
- strtab + sym->st_name, (unsigned long)sym->st_value,
- (long)rela[i].r_addend);
-
- /* `Everything is relative'. */
- value = sym->st_value + rela[i].r_addend;
-
- switch (ELF64_R_TYPE(rela[i].r_info)) {
- case R_PPC64_ADDR32:
- /* Simply set it */
- *(u32 *)location = value;
- break;
-
- case R_PPC64_ADDR64:
- /* Simply set it */
- *(unsigned long *)location = value;
- break;
-
- case R_PPC64_TOC:
- *(unsigned long *)location = my_r2(sechdrs, me);
- break;
-
- case R_PPC64_TOC16:
- /* Subtact TOC pointer */
- value -= my_r2(sechdrs, me);
- if (value + 0x8000 > 0xffff) {
- printk("%s: bad TOC16 relocation (%lu)\n",
- me->name, value);
- return -ENOEXEC;
- }
- *((uint16_t *) location)
- = (*((uint16_t *) location) & ~0xffff)
- | (value & 0xffff);
- break;
-
- case R_PPC64_TOC16_DS:
- /* Subtact TOC pointer */
- value -= my_r2(sechdrs, me);
- if ((value & 3) != 0 || value + 0x8000 > 0xffff) {
- printk("%s: bad TOC16_DS relocation (%lu)\n",
- me->name, value);
- return -ENOEXEC;
- }
- *((uint16_t *) location)
- = (*((uint16_t *) location) & ~0xfffc)
- | (value & 0xfffc);
- break;
-
- case R_PPC_REL24:
- /* FIXME: Handle weak symbols here --RR */
- if (sym->st_shndx == SHN_UNDEF) {
- /* External: go via stub */
- value = stub_for_addr(sechdrs, value, me);
- if (!value)
- return -ENOENT;
- if (!restore_r2((u32 *)location + 1, me))
- return -ENOEXEC;
- }
-
- /* Convert value to relative */
- value -= (unsigned long)location;
- if (value + 0x2000000 > 0x3ffffff || (value & 3) != 0){
- printk("%s: REL24 %li out of range!\n",
- me->name, (long int)value);
- return -ENOEXEC;
- }
-
- /* Only replace bits 2 through 26 */
- *(uint32_t *)location
- = (*(uint32_t *)location & ~0x03fffffc)
- | (value & 0x03fffffc);
- break;
-
- default:
- printk("%s: Unknown ADD relocation: %lu\n",
- me->name,
- (unsigned long)ELF64_R_TYPE(rela[i].r_info));
- return -ENOEXEC;
- }
- }
-
- return 0;
-}
-
-LIST_HEAD(module_bug_list);
-
-int module_finalize(const Elf_Ehdr *hdr,
- const Elf_Shdr *sechdrs, struct module *me)
-{
- char *secstrings;
- unsigned int i;
-
- me->arch.bug_table = NULL;
- me->arch.num_bugs = 0;
-
- /* Find the __bug_table section, if present */
- secstrings = (char *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
- for (i = 1; i < hdr->e_shnum; i++) {
- if (strcmp(secstrings+sechdrs[i].sh_name, "__bug_table"))
- continue;
- me->arch.bug_table = (void *) sechdrs[i].sh_addr;
- me->arch.num_bugs = sechdrs[i].sh_size / sizeof(struct bug_entry);
- break;
- }
-
- /*
- * Strictly speaking this should have a spinlock to protect against
- * traversals, but since we only traverse on BUG()s, a spinlock
- * could potentially lead to deadlock and thus be counter-productive.
- */
- list_add(&me->arch.bug_list, &module_bug_list);
-
- return 0;
-}
-
-void module_arch_cleanup(struct module *mod)
-{
- list_del(&mod->arch.bug_list);
-}
-
-struct bug_entry *module_find_bug(unsigned long bugaddr)
-{
- struct mod_arch_specific *mod;
- unsigned int i;
- struct bug_entry *bug;
-
- list_for_each_entry(mod, &module_bug_list, bug_list) {
- bug = mod->bug_table;
- for (i = 0; i < mod->num_bugs; ++i, ++bug)
- if (bugaddr == bug->bug_addr)
- return bug;
- }
- return NULL;
-}
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