848484e2c4
None of these files are using modular infrastructure, and build tests reveal that none of these files are really relying on any implicit inclusions via. module.h either. So delete them. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
392 lines
9.6 KiB
C
392 lines
9.6 KiB
C
/*
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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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*
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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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*
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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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* Copyright (C) 2001 Rusty Russell.
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* Copyright (C) 2003, 2004 Ralf Baechle (ralf@linux-mips.org)
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* Copyright (C) 2005 Thiemo Seufer
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*/
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#undef DEBUG
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#include <linux/moduleloader.h>
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#include <linux/elf.h>
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/spinlock.h>
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#include <linux/jump_label.h>
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#include <asm/pgtable.h> /* MODULE_START */
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struct mips_hi16 {
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struct mips_hi16 *next;
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Elf_Addr *addr;
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Elf_Addr value;
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};
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static struct mips_hi16 *mips_hi16_list;
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static LIST_HEAD(dbe_list);
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static DEFINE_SPINLOCK(dbe_lock);
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#ifdef MODULE_START
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void *module_alloc(unsigned long size)
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{
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return __vmalloc_node_range(size, 1, MODULE_START, MODULE_END,
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GFP_KERNEL, PAGE_KERNEL, -1,
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__builtin_return_address(0));
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}
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#endif
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static int apply_r_mips_none(struct module *me, u32 *location, Elf_Addr v)
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{
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return 0;
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}
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static int apply_r_mips_32_rel(struct module *me, u32 *location, Elf_Addr v)
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{
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*location += v;
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return 0;
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}
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static int apply_r_mips_32_rela(struct module *me, u32 *location, Elf_Addr v)
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{
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*location = v;
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return 0;
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}
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static int apply_r_mips_26_rel(struct module *me, u32 *location, Elf_Addr v)
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{
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if (v % 4) {
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pr_err("module %s: dangerous R_MIPS_26 REL relocation\n",
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me->name);
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return -ENOEXEC;
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}
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if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
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printk(KERN_ERR
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"module %s: relocation overflow\n",
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me->name);
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return -ENOEXEC;
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}
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*location = (*location & ~0x03ffffff) |
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((*location + (v >> 2)) & 0x03ffffff);
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return 0;
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}
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static int apply_r_mips_26_rela(struct module *me, u32 *location, Elf_Addr v)
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{
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if (v % 4) {
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pr_err("module %s: dangerous R_MIPS_26 RELArelocation\n",
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me->name);
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return -ENOEXEC;
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}
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if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
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printk(KERN_ERR
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"module %s: relocation overflow\n",
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me->name);
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return -ENOEXEC;
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}
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*location = (*location & ~0x03ffffff) | ((v >> 2) & 0x03ffffff);
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return 0;
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}
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static int apply_r_mips_hi16_rel(struct module *me, u32 *location, Elf_Addr v)
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{
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struct mips_hi16 *n;
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/*
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* We cannot relocate this one now because we don't know the value of
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* the carry we need to add. Save the information, and let LO16 do the
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* actual relocation.
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*/
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n = kmalloc(sizeof *n, GFP_KERNEL);
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if (!n)
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return -ENOMEM;
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n->addr = (Elf_Addr *)location;
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n->value = v;
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n->next = mips_hi16_list;
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mips_hi16_list = n;
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return 0;
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}
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static int apply_r_mips_hi16_rela(struct module *me, u32 *location, Elf_Addr v)
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{
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*location = (*location & 0xffff0000) |
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((((long long) v + 0x8000LL) >> 16) & 0xffff);
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return 0;
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}
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static int apply_r_mips_lo16_rel(struct module *me, u32 *location, Elf_Addr v)
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{
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unsigned long insnlo = *location;
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Elf_Addr val, vallo;
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/* Sign extend the addend we extract from the lo insn. */
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vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
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if (mips_hi16_list != NULL) {
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struct mips_hi16 *l;
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l = mips_hi16_list;
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while (l != NULL) {
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struct mips_hi16 *next;
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unsigned long insn;
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/*
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* The value for the HI16 had best be the same.
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*/
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if (v != l->value)
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goto out_danger;
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/*
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* Do the HI16 relocation. Note that we actually don't
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* need to know anything about the LO16 itself, except
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* where to find the low 16 bits of the addend needed
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* by the LO16.
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*/
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insn = *l->addr;
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val = ((insn & 0xffff) << 16) + vallo;
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val += v;
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/*
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* Account for the sign extension that will happen in
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* the low bits.
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*/
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val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff;
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insn = (insn & ~0xffff) | val;
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*l->addr = insn;
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next = l->next;
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kfree(l);
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l = next;
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}
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mips_hi16_list = NULL;
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}
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/*
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* Ok, we're done with the HI16 relocs. Now deal with the LO16.
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*/
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val = v + vallo;
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insnlo = (insnlo & ~0xffff) | (val & 0xffff);
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*location = insnlo;
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return 0;
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out_danger:
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pr_err("module %s: dangerous R_MIPS_LO16 REL relocation\n", me->name);
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return -ENOEXEC;
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}
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static int apply_r_mips_lo16_rela(struct module *me, u32 *location, Elf_Addr v)
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{
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*location = (*location & 0xffff0000) | (v & 0xffff);
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return 0;
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}
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static int apply_r_mips_64_rela(struct module *me, u32 *location, Elf_Addr v)
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{
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*(Elf_Addr *)location = v;
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return 0;
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}
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static int apply_r_mips_higher_rela(struct module *me, u32 *location,
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Elf_Addr v)
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{
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*location = (*location & 0xffff0000) |
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((((long long) v + 0x80008000LL) >> 32) & 0xffff);
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return 0;
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}
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static int apply_r_mips_highest_rela(struct module *me, u32 *location,
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Elf_Addr v)
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{
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*location = (*location & 0xffff0000) |
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((((long long) v + 0x800080008000LL) >> 48) & 0xffff);
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return 0;
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}
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static int (*reloc_handlers_rel[]) (struct module *me, u32 *location,
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Elf_Addr v) = {
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[R_MIPS_NONE] = apply_r_mips_none,
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[R_MIPS_32] = apply_r_mips_32_rel,
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[R_MIPS_26] = apply_r_mips_26_rel,
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[R_MIPS_HI16] = apply_r_mips_hi16_rel,
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[R_MIPS_LO16] = apply_r_mips_lo16_rel
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};
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static int (*reloc_handlers_rela[]) (struct module *me, u32 *location,
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Elf_Addr v) = {
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[R_MIPS_NONE] = apply_r_mips_none,
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[R_MIPS_32] = apply_r_mips_32_rela,
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[R_MIPS_26] = apply_r_mips_26_rela,
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[R_MIPS_HI16] = apply_r_mips_hi16_rela,
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[R_MIPS_LO16] = apply_r_mips_lo16_rela,
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[R_MIPS_64] = apply_r_mips_64_rela,
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[R_MIPS_HIGHER] = apply_r_mips_higher_rela,
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[R_MIPS_HIGHEST] = apply_r_mips_highest_rela
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};
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int apply_relocate(Elf_Shdr *sechdrs, const char *strtab,
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unsigned int symindex, unsigned int relsec,
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struct module *me)
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{
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Elf_Mips_Rel *rel = (void *) sechdrs[relsec].sh_addr;
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Elf_Sym *sym;
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u32 *location;
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unsigned int i;
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Elf_Addr v;
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int res;
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pr_debug("Applying relocate section %u to %u\n", relsec,
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sechdrs[relsec].sh_info);
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for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
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/* This is where to make the change */
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location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
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+ rel[i].r_offset;
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/* This is the symbol it is referring to */
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sym = (Elf_Sym *)sechdrs[symindex].sh_addr
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+ ELF_MIPS_R_SYM(rel[i]);
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if (IS_ERR_VALUE(sym->st_value)) {
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/* Ignore unresolved weak symbol */
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if (ELF_ST_BIND(sym->st_info) == STB_WEAK)
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continue;
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printk(KERN_WARNING "%s: Unknown symbol %s\n",
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me->name, strtab + sym->st_name);
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return -ENOENT;
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}
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v = sym->st_value;
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res = reloc_handlers_rel[ELF_MIPS_R_TYPE(rel[i])](me, location, v);
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if (res)
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return res;
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}
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return 0;
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}
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int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
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unsigned int symindex, unsigned int relsec,
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struct module *me)
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{
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Elf_Mips_Rela *rel = (void *) sechdrs[relsec].sh_addr;
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Elf_Sym *sym;
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u32 *location;
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unsigned int i;
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Elf_Addr v;
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int res;
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pr_debug("Applying relocate section %u to %u\n", relsec,
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sechdrs[relsec].sh_info);
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for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
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/* This is where to make the change */
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location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
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+ rel[i].r_offset;
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/* This is the symbol it is referring to */
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sym = (Elf_Sym *)sechdrs[symindex].sh_addr
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+ ELF_MIPS_R_SYM(rel[i]);
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if (IS_ERR_VALUE(sym->st_value)) {
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/* Ignore unresolved weak symbol */
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if (ELF_ST_BIND(sym->st_info) == STB_WEAK)
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continue;
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printk(KERN_WARNING "%s: Unknown symbol %s\n",
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me->name, strtab + sym->st_name);
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return -ENOENT;
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}
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v = sym->st_value + rel[i].r_addend;
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res = reloc_handlers_rela[ELF_MIPS_R_TYPE(rel[i])](me, location, v);
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if (res)
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return res;
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}
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return 0;
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}
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/* Given an address, look for it in the module exception tables. */
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const struct exception_table_entry *search_module_dbetables(unsigned long addr)
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{
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unsigned long flags;
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const struct exception_table_entry *e = NULL;
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struct mod_arch_specific *dbe;
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spin_lock_irqsave(&dbe_lock, flags);
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list_for_each_entry(dbe, &dbe_list, dbe_list) {
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e = search_extable(dbe->dbe_start, dbe->dbe_end - 1, addr);
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if (e)
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break;
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}
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spin_unlock_irqrestore(&dbe_lock, flags);
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/* Now, if we found one, we are running inside it now, hence
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we cannot unload the module, hence no refcnt needed. */
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return e;
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}
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/* Put in dbe list if necessary. */
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int module_finalize(const Elf_Ehdr *hdr,
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const Elf_Shdr *sechdrs,
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struct module *me)
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{
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const Elf_Shdr *s;
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char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
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/* Make jump label nops. */
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jump_label_apply_nops(me);
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INIT_LIST_HEAD(&me->arch.dbe_list);
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for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
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if (strcmp("__dbe_table", secstrings + s->sh_name) != 0)
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continue;
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me->arch.dbe_start = (void *)s->sh_addr;
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me->arch.dbe_end = (void *)s->sh_addr + s->sh_size;
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spin_lock_irq(&dbe_lock);
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list_add(&me->arch.dbe_list, &dbe_list);
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spin_unlock_irq(&dbe_lock);
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}
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return 0;
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}
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void module_arch_cleanup(struct module *mod)
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{
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spin_lock_irq(&dbe_lock);
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list_del(&mod->arch.dbe_list);
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spin_unlock_irq(&dbe_lock);
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}
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