2005-02-21 03:45:09 -07:00
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/*
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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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2008-07-23 22:28:13 -06:00
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#include <linux/mm.h>
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2013-09-18 06:54:37 -06:00
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#include <linux/numa.h>
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2005-02-21 03:45:09 -07:00
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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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2005-04-16 16:20:36 -06:00
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#include <linux/spinlock.h>
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2010-12-28 14:26:23 -07:00
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#include <linux/jump_label.h>
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[MIPS] Load modules to CKSEG0 if CONFIG_BUILD_ELF64=n
This is a patch to load 64-bit modules to CKSEG0 so that can be
compiled with -msym32 option. This makes each module ~10% smaller.
* introduce MODULE_START and MODULE_END
* custom module_alloc()
* PGD for modules
* change XTLB refill handler synthesizer
* enable -msym32 for modules again
(revert ca78b1a5c6a6e70e052d3ea253828e49b5d07c8a)
New XTLB refill handler looks like this:
80000080 dmfc0 k0,C0_BADVADDR
80000084 bltz k0,800000e4 # goto l_module_alloc
80000088 lui k1,0x8046 # %high(pgd_current)
8000008c ld k1,24600(k1) # %low(pgd_current)
80000090 dsrl k0,k0,0x1b # l_vmalloc_done:
80000094 andi k0,k0,0x1ff8
80000098 daddu k1,k1,k0
8000009c dmfc0 k0,C0_BADVADDR
800000a0 ld k1,0(k1)
800000a4 dsrl k0,k0,0x12
800000a8 andi k0,k0,0xff8
800000ac daddu k1,k1,k0
800000b0 dmfc0 k0,C0_XCONTEXT
800000b4 ld k1,0(k1)
800000b8 andi k0,k0,0xff0
800000bc daddu k1,k1,k0
800000c0 ld k0,0(k1)
800000c4 ld k1,8(k1)
800000c8 dsrl k0,k0,0x6
800000cc mtc0 k0,C0_ENTRYLO0
800000d0 dsrl k1,k1,0x6
800000d4 mtc0 k1,C0_ENTRYL01
800000d8 nop
800000dc tlbwr
800000e0 eret
800000e4 dsll k1,k0,0x2 # l_module_alloc:
800000e8 bgez k1,80000008 # goto l_vmalloc
800000ec lui k1,0xc000
800000f0 dsubu k0,k0,k1
800000f4 lui k1,0x8046 # %high(module_pg_dir)
800000f8 beq zero,zero,80000000
800000fc nop
80000000 beq zero,zero,80000090 # goto l_vmalloc_done
80000004 daddiu k1,k1,0x4000
80000008 dsll32 k1,k1,0x0 # l_vmalloc:
8000000c dsubu k0,k0,k1
80000010 beq zero,zero,80000090 # goto l_vmalloc_done
80000014 lui k1,0x8046 # %high(swapper_pg_dir)
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2006-10-25 09:08:31 -06:00
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#include <asm/pgtable.h> /* MODULE_START */
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2005-04-16 16:20:36 -06:00
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2005-02-21 03:45:09 -07:00
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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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2005-04-16 16:20:36 -06:00
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static LIST_HEAD(dbe_list);
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static DEFINE_SPINLOCK(dbe_lock);
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2011-06-30 13:22:12 -06:00
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#ifdef MODULE_START
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2005-02-21 03:45:09 -07:00
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void *module_alloc(unsigned long size)
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{
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2011-01-13 16:46:02 -07:00
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return __vmalloc_node_range(size, 1, MODULE_START, MODULE_END,
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2015-02-13 15:40:07 -07:00
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GFP_KERNEL, PAGE_KERNEL, 0, NUMA_NO_NODE,
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2011-01-13 16:46:02 -07:00
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__builtin_return_address(0));
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2005-02-21 03:45:09 -07:00
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}
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2011-06-30 13:22:12 -06:00
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#endif
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2005-02-21 03:45:09 -07:00
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2012-08-14 09:13:45 -06:00
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int apply_r_mips_none(struct module *me, u32 *location, Elf_Addr v)
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2005-02-21 03:45:09 -07:00
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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_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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2009-08-03 03:50:19 -06:00
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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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2005-02-21 03:45:09 -07:00
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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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2016-02-04 06:05:03 -07:00
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pr_err("module %s: relocation overflow\n",
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2005-02-21 03:45:09 -07:00
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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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2013-01-22 04:59:30 -07:00
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((*location + (v >> 2)) & 0x03ffffff);
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2005-02-21 03:45:09 -07:00
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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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2012-08-08 08:59:43 -06:00
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n->next = me->arch.r_mips_hi16_list;
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me->arch.r_mips_hi16_list = n;
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2005-02-21 03:45:09 -07:00
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return 0;
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}
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2012-08-13 16:34:18 -06:00
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static void free_relocation_chain(struct mips_hi16 *l)
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{
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struct mips_hi16 *next;
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while (l) {
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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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}
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2005-02-21 03:45:09 -07:00
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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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2012-08-13 16:34:18 -06:00
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struct mips_hi16 *l;
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2005-02-21 03:45:09 -07:00
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Elf_Addr val, vallo;
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2013-01-22 04:59:30 -07:00
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/* Sign extend the addend we extract from the lo insn. */
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2005-02-21 03:45:09 -07:00
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vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
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2012-08-08 08:59:43 -06:00
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if (me->arch.r_mips_hi16_list != NULL) {
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l = me->arch.r_mips_hi16_list;
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2005-02-21 03:45:09 -07:00
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while (l != NULL) {
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2012-08-13 16:34:18 -06:00
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struct mips_hi16 *next;
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2005-02-21 03:45:09 -07:00
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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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2012-08-08 08:59:43 -06:00
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me->arch.r_mips_hi16_list = NULL;
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2005-02-21 03:45:09 -07:00
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}
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/*
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2013-01-22 04:59:30 -07:00
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* Ok, we're done with the HI16 relocs. Now deal with the LO16.
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2005-02-21 03:45:09 -07:00
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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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2012-08-13 16:34:18 -06:00
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free_relocation_chain(l);
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me->arch.r_mips_hi16_list = NULL;
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2012-08-08 06:57:03 -06:00
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2009-08-03 03:50:19 -06:00
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pr_err("module %s: dangerous R_MIPS_LO16 REL relocation\n", me->name);
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2005-02-21 03:45:09 -07:00
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return -ENOEXEC;
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}
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2016-02-04 06:05:05 -07:00
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static int apply_r_mips_pc_rel(struct module *me, u32 *location, Elf_Addr v,
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unsigned bits)
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{
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unsigned long mask = GENMASK(bits - 1, 0);
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unsigned long se_bits;
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long offset;
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if (v % 4) {
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pr_err("module %s: dangerous R_MIPS_PC%u REL relocation\n",
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me->name, bits);
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return -ENOEXEC;
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}
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/* retrieve & sign extend implicit addend */
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offset = *location & mask;
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offset |= (offset & BIT(bits - 1)) ? ~mask : 0;
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offset += ((long)v - (long)location) >> 2;
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/* check the sign bit onwards are identical - ie. we didn't overflow */
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se_bits = (offset & BIT(bits - 1)) ? ~0ul : 0;
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if ((offset & ~mask) != (se_bits & ~mask)) {
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pr_err("module %s: relocation overflow\n", me->name);
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return -ENOEXEC;
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}
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*location = (*location & ~mask) | (offset & mask);
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return 0;
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}
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static int apply_r_mips_pc16_rel(struct module *me, u32 *location, Elf_Addr v)
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{
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return apply_r_mips_pc_rel(me, location, v, 16);
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}
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static int apply_r_mips_pc21_rel(struct module *me, u32 *location, Elf_Addr v)
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{
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return apply_r_mips_pc_rel(me, location, v, 21);
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}
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static int apply_r_mips_pc26_rel(struct module *me, u32 *location, Elf_Addr v)
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{
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return apply_r_mips_pc_rel(me, location, v, 26);
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}
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2005-02-21 03:45:09 -07:00
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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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2016-02-04 06:05:05 -07:00
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[R_MIPS_LO16] = apply_r_mips_lo16_rel,
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[R_MIPS_PC16] = apply_r_mips_pc16_rel,
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[R_MIPS_PC21_S2] = apply_r_mips_pc21_rel,
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[R_MIPS_PC26_S2] = apply_r_mips_pc26_rel,
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2005-02-21 03:45:09 -07:00
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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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2016-02-04 06:05:02 -07:00
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int (*handler)(struct module *me, u32 *location, Elf_Addr v);
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2005-02-21 03:45:09 -07:00
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Elf_Sym *sym;
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u32 *location;
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2016-02-04 06:05:02 -07:00
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unsigned int i, type;
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2005-02-21 03:45:09 -07:00
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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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2012-08-08 08:59:43 -06:00
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me->arch.r_mips_hi16_list = NULL;
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2005-02-21 03:45:09 -07:00
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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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2016-02-15 07:35:20 -07:00
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if (sym->st_value >= -MAX_ERRNO) {
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2006-05-22 09:45:07 -06:00
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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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2016-02-04 06:05:03 -07:00
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pr_warn("%s: Unknown symbol %s\n",
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me->name, strtab + sym->st_name);
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2005-02-21 03:45:09 -07:00
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return -ENOENT;
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}
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2016-02-04 06:05:02 -07:00
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type = ELF_MIPS_R_TYPE(rel[i]);
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if (type < ARRAY_SIZE(reloc_handlers_rel))
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handler = reloc_handlers_rel[type];
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else
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handler = NULL;
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2005-02-21 03:45:09 -07:00
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2016-02-04 06:05:02 -07:00
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if (!handler) {
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pr_err("%s: Unknown relocation type %u\n",
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me->name, type);
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return -EINVAL;
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}
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v = sym->st_value;
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|
|
|
res = handler(me, location, v);
|
2005-02-21 03:45:09 -07:00
|
|
|
if (res)
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
2012-08-13 16:34:18 -06:00
|
|
|
/*
|
2013-01-22 04:59:30 -07:00
|
|
|
* Normally the hi16 list should be deallocated at this point. A
|
2012-08-13 16:34:18 -06:00
|
|
|
* malformed binary however could contain a series of R_MIPS_HI16
|
|
|
|
* relocations not followed by a R_MIPS_LO16 relocation. In that
|
|
|
|
* case, free up the list and return an error.
|
|
|
|
*/
|
|
|
|
if (me->arch.r_mips_hi16_list) {
|
|
|
|
free_relocation_chain(me->arch.r_mips_hi16_list);
|
|
|
|
me->arch.r_mips_hi16_list = NULL;
|
|
|
|
|
|
|
|
return -ENOEXEC;
|
|
|
|
}
|
|
|
|
|
2005-02-21 03:45:09 -07:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/* Given an address, look for it in the module exception tables. */
|
|
|
|
const struct exception_table_entry *search_module_dbetables(unsigned long addr)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
const struct exception_table_entry *e = NULL;
|
|
|
|
struct mod_arch_specific *dbe;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&dbe_lock, flags);
|
|
|
|
list_for_each_entry(dbe, &dbe_list, dbe_list) {
|
|
|
|
e = search_extable(dbe->dbe_start, dbe->dbe_end - 1, addr);
|
|
|
|
if (e)
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
spin_unlock_irqrestore(&dbe_lock, flags);
|
|
|
|
|
|
|
|
/* Now, if we found one, we are running inside it now, hence
|
2013-01-22 04:59:30 -07:00
|
|
|
we cannot unload the module, hence no refcnt needed. */
|
2005-04-16 16:20:36 -06:00
|
|
|
return e;
|
|
|
|
}
|
|
|
|
|
2007-10-19 15:10:43 -06:00
|
|
|
/* Put in dbe list if necessary. */
|
2005-04-16 16:20:36 -06:00
|
|
|
int module_finalize(const Elf_Ehdr *hdr,
|
|
|
|
const Elf_Shdr *sechdrs,
|
|
|
|
struct module *me)
|
|
|
|
{
|
|
|
|
const Elf_Shdr *s;
|
|
|
|
char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
|
|
|
|
|
2010-12-28 14:26:23 -07:00
|
|
|
/* Make jump label nops. */
|
|
|
|
jump_label_apply_nops(me);
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
INIT_LIST_HEAD(&me->arch.dbe_list);
|
|
|
|
for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
|
|
|
|
if (strcmp("__dbe_table", secstrings + s->sh_name) != 0)
|
|
|
|
continue;
|
|
|
|
me->arch.dbe_start = (void *)s->sh_addr;
|
|
|
|
me->arch.dbe_end = (void *)s->sh_addr + s->sh_size;
|
|
|
|
spin_lock_irq(&dbe_lock);
|
|
|
|
list_add(&me->arch.dbe_list, &dbe_list);
|
|
|
|
spin_unlock_irq(&dbe_lock);
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
void module_arch_cleanup(struct module *mod)
|
|
|
|
{
|
|
|
|
spin_lock_irq(&dbe_lock);
|
|
|
|
list_del(&mod->arch.dbe_list);
|
|
|
|
spin_unlock_irq(&dbe_lock);
|
|
|
|
}
|