359 lines
9.6 KiB
C
359 lines
9.6 KiB
C
/*
|
|
* linux/arch/arm/kernel/module.c
|
|
*
|
|
* Copyright (C) 2002 Russell King.
|
|
* Modified for nommu by Hyok S. Choi
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* Module allocation method suggested by Andi Kleen.
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/moduleloader.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/elf.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/string.h>
|
|
#include <linux/gfp.h>
|
|
|
|
#include <asm/pgtable.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/smp_plat.h>
|
|
#include <asm/unwind.h>
|
|
|
|
#ifdef CONFIG_XIP_KERNEL
|
|
/*
|
|
* The XIP kernel text is mapped in the module area for modules and
|
|
* some other stuff to work without any indirect relocations.
|
|
* MODULES_VADDR is redefined here and not in asm/memory.h to avoid
|
|
* recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off.
|
|
*/
|
|
#undef MODULES_VADDR
|
|
#define MODULES_VADDR (((unsigned long)_etext + ~PGDIR_MASK) & PGDIR_MASK)
|
|
#endif
|
|
|
|
#ifdef CONFIG_MMU
|
|
void *module_alloc(unsigned long size)
|
|
{
|
|
return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
|
|
GFP_KERNEL, PAGE_KERNEL_EXEC, -1,
|
|
__builtin_return_address(0));
|
|
}
|
|
#else /* CONFIG_MMU */
|
|
void *module_alloc(unsigned long size)
|
|
{
|
|
return size == 0 ? NULL : vmalloc(size);
|
|
}
|
|
#endif /* !CONFIG_MMU */
|
|
|
|
void module_free(struct module *module, void *region)
|
|
{
|
|
vfree(region);
|
|
}
|
|
|
|
int module_frob_arch_sections(Elf_Ehdr *hdr,
|
|
Elf_Shdr *sechdrs,
|
|
char *secstrings,
|
|
struct module *mod)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
|
|
unsigned int relindex, struct module *module)
|
|
{
|
|
Elf32_Shdr *symsec = sechdrs + symindex;
|
|
Elf32_Shdr *relsec = sechdrs + relindex;
|
|
Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
|
|
Elf32_Rel *rel = (void *)relsec->sh_addr;
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
|
|
unsigned long loc;
|
|
Elf32_Sym *sym;
|
|
const char *symname;
|
|
s32 offset;
|
|
#ifdef CONFIG_THUMB2_KERNEL
|
|
u32 upper, lower, sign, j1, j2;
|
|
#endif
|
|
|
|
offset = ELF32_R_SYM(rel->r_info);
|
|
if (offset < 0 || offset > (symsec->sh_size / sizeof(Elf32_Sym))) {
|
|
pr_err("%s: section %u reloc %u: bad relocation sym offset\n",
|
|
module->name, relindex, i);
|
|
return -ENOEXEC;
|
|
}
|
|
|
|
sym = ((Elf32_Sym *)symsec->sh_addr) + offset;
|
|
symname = strtab + sym->st_name;
|
|
|
|
if (rel->r_offset < 0 || rel->r_offset > dstsec->sh_size - sizeof(u32)) {
|
|
pr_err("%s: section %u reloc %u sym '%s': out of bounds relocation, offset %d size %u\n",
|
|
module->name, relindex, i, symname,
|
|
rel->r_offset, dstsec->sh_size);
|
|
return -ENOEXEC;
|
|
}
|
|
|
|
loc = dstsec->sh_addr + rel->r_offset;
|
|
|
|
switch (ELF32_R_TYPE(rel->r_info)) {
|
|
case R_ARM_NONE:
|
|
/* ignore */
|
|
break;
|
|
|
|
case R_ARM_ABS32:
|
|
*(u32 *)loc += sym->st_value;
|
|
break;
|
|
|
|
case R_ARM_PC24:
|
|
case R_ARM_CALL:
|
|
case R_ARM_JUMP24:
|
|
offset = (*(u32 *)loc & 0x00ffffff) << 2;
|
|
if (offset & 0x02000000)
|
|
offset -= 0x04000000;
|
|
|
|
offset += sym->st_value - loc;
|
|
if (offset & 3 ||
|
|
offset <= (s32)0xfe000000 ||
|
|
offset >= (s32)0x02000000) {
|
|
pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n",
|
|
module->name, relindex, i, symname,
|
|
ELF32_R_TYPE(rel->r_info), loc,
|
|
sym->st_value);
|
|
return -ENOEXEC;
|
|
}
|
|
|
|
offset >>= 2;
|
|
|
|
*(u32 *)loc &= 0xff000000;
|
|
*(u32 *)loc |= offset & 0x00ffffff;
|
|
break;
|
|
|
|
case R_ARM_V4BX:
|
|
/* Preserve Rm and the condition code. Alter
|
|
* other bits to re-code instruction as
|
|
* MOV PC,Rm.
|
|
*/
|
|
*(u32 *)loc &= 0xf000000f;
|
|
*(u32 *)loc |= 0x01a0f000;
|
|
break;
|
|
|
|
case R_ARM_PREL31:
|
|
offset = *(u32 *)loc + sym->st_value - loc;
|
|
*(u32 *)loc = offset & 0x7fffffff;
|
|
break;
|
|
|
|
case R_ARM_MOVW_ABS_NC:
|
|
case R_ARM_MOVT_ABS:
|
|
offset = *(u32 *)loc;
|
|
offset = ((offset & 0xf0000) >> 4) | (offset & 0xfff);
|
|
offset = (offset ^ 0x8000) - 0x8000;
|
|
|
|
offset += sym->st_value;
|
|
if (ELF32_R_TYPE(rel->r_info) == R_ARM_MOVT_ABS)
|
|
offset >>= 16;
|
|
|
|
*(u32 *)loc &= 0xfff0f000;
|
|
*(u32 *)loc |= ((offset & 0xf000) << 4) |
|
|
(offset & 0x0fff);
|
|
break;
|
|
|
|
#ifdef CONFIG_THUMB2_KERNEL
|
|
case R_ARM_THM_CALL:
|
|
case R_ARM_THM_JUMP24:
|
|
upper = *(u16 *)loc;
|
|
lower = *(u16 *)(loc + 2);
|
|
|
|
/*
|
|
* 25 bit signed address range (Thumb-2 BL and B.W
|
|
* instructions):
|
|
* S:I1:I2:imm10:imm11:0
|
|
* where:
|
|
* S = upper[10] = offset[24]
|
|
* I1 = ~(J1 ^ S) = offset[23]
|
|
* I2 = ~(J2 ^ S) = offset[22]
|
|
* imm10 = upper[9:0] = offset[21:12]
|
|
* imm11 = lower[10:0] = offset[11:1]
|
|
* J1 = lower[13]
|
|
* J2 = lower[11]
|
|
*/
|
|
sign = (upper >> 10) & 1;
|
|
j1 = (lower >> 13) & 1;
|
|
j2 = (lower >> 11) & 1;
|
|
offset = (sign << 24) | ((~(j1 ^ sign) & 1) << 23) |
|
|
((~(j2 ^ sign) & 1) << 22) |
|
|
((upper & 0x03ff) << 12) |
|
|
((lower & 0x07ff) << 1);
|
|
if (offset & 0x01000000)
|
|
offset -= 0x02000000;
|
|
offset += sym->st_value - loc;
|
|
|
|
/* only Thumb addresses allowed (no interworking) */
|
|
if (!(offset & 1) ||
|
|
offset <= (s32)0xff000000 ||
|
|
offset >= (s32)0x01000000) {
|
|
pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n",
|
|
module->name, relindex, i, symname,
|
|
ELF32_R_TYPE(rel->r_info), loc,
|
|
sym->st_value);
|
|
return -ENOEXEC;
|
|
}
|
|
|
|
sign = (offset >> 24) & 1;
|
|
j1 = sign ^ (~(offset >> 23) & 1);
|
|
j2 = sign ^ (~(offset >> 22) & 1);
|
|
*(u16 *)loc = (u16)((upper & 0xf800) | (sign << 10) |
|
|
((offset >> 12) & 0x03ff));
|
|
*(u16 *)(loc + 2) = (u16)((lower & 0xd000) |
|
|
(j1 << 13) | (j2 << 11) |
|
|
((offset >> 1) & 0x07ff));
|
|
break;
|
|
|
|
case R_ARM_THM_MOVW_ABS_NC:
|
|
case R_ARM_THM_MOVT_ABS:
|
|
upper = *(u16 *)loc;
|
|
lower = *(u16 *)(loc + 2);
|
|
|
|
/*
|
|
* MOVT/MOVW instructions encoding in Thumb-2:
|
|
*
|
|
* i = upper[10]
|
|
* imm4 = upper[3:0]
|
|
* imm3 = lower[14:12]
|
|
* imm8 = lower[7:0]
|
|
*
|
|
* imm16 = imm4:i:imm3:imm8
|
|
*/
|
|
offset = ((upper & 0x000f) << 12) |
|
|
((upper & 0x0400) << 1) |
|
|
((lower & 0x7000) >> 4) | (lower & 0x00ff);
|
|
offset = (offset ^ 0x8000) - 0x8000;
|
|
offset += sym->st_value;
|
|
|
|
if (ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVT_ABS)
|
|
offset >>= 16;
|
|
|
|
*(u16 *)loc = (u16)((upper & 0xfbf0) |
|
|
((offset & 0xf000) >> 12) |
|
|
((offset & 0x0800) >> 1));
|
|
*(u16 *)(loc + 2) = (u16)((lower & 0x8f00) |
|
|
((offset & 0x0700) << 4) |
|
|
(offset & 0x00ff));
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
printk(KERN_ERR "%s: unknown relocation: %u\n",
|
|
module->name, ELF32_R_TYPE(rel->r_info));
|
|
return -ENOEXEC;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
|
|
unsigned int symindex, unsigned int relsec, struct module *module)
|
|
{
|
|
printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n",
|
|
module->name);
|
|
return -ENOEXEC;
|
|
}
|
|
|
|
struct mod_unwind_map {
|
|
const Elf_Shdr *unw_sec;
|
|
const Elf_Shdr *txt_sec;
|
|
};
|
|
|
|
static const Elf_Shdr *find_mod_section(const Elf32_Ehdr *hdr,
|
|
const Elf_Shdr *sechdrs, const char *name)
|
|
{
|
|
const Elf_Shdr *s, *se;
|
|
const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
|
|
|
|
for (s = sechdrs, se = sechdrs + hdr->e_shnum; s < se; s++)
|
|
if (strcmp(name, secstrs + s->sh_name) == 0)
|
|
return s;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
extern void fixup_pv_table(const void *, unsigned long);
|
|
extern void fixup_smp(const void *, unsigned long);
|
|
|
|
int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,
|
|
struct module *mod)
|
|
{
|
|
const Elf_Shdr *s = NULL;
|
|
#ifdef CONFIG_ARM_UNWIND
|
|
const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
|
|
const Elf_Shdr *sechdrs_end = sechdrs + hdr->e_shnum;
|
|
struct mod_unwind_map maps[ARM_SEC_MAX];
|
|
int i;
|
|
|
|
memset(maps, 0, sizeof(maps));
|
|
|
|
for (s = sechdrs; s < sechdrs_end; s++) {
|
|
const char *secname = secstrs + s->sh_name;
|
|
|
|
if (!(s->sh_flags & SHF_ALLOC))
|
|
continue;
|
|
|
|
if (strcmp(".ARM.exidx.init.text", secname) == 0)
|
|
maps[ARM_SEC_INIT].unw_sec = s;
|
|
else if (strcmp(".ARM.exidx.devinit.text", secname) == 0)
|
|
maps[ARM_SEC_DEVINIT].unw_sec = s;
|
|
else if (strcmp(".ARM.exidx", secname) == 0)
|
|
maps[ARM_SEC_CORE].unw_sec = s;
|
|
else if (strcmp(".ARM.exidx.exit.text", secname) == 0)
|
|
maps[ARM_SEC_EXIT].unw_sec = s;
|
|
else if (strcmp(".ARM.exidx.devexit.text", secname) == 0)
|
|
maps[ARM_SEC_DEVEXIT].unw_sec = s;
|
|
else if (strcmp(".init.text", secname) == 0)
|
|
maps[ARM_SEC_INIT].txt_sec = s;
|
|
else if (strcmp(".devinit.text", secname) == 0)
|
|
maps[ARM_SEC_DEVINIT].txt_sec = s;
|
|
else if (strcmp(".text", secname) == 0)
|
|
maps[ARM_SEC_CORE].txt_sec = s;
|
|
else if (strcmp(".exit.text", secname) == 0)
|
|
maps[ARM_SEC_EXIT].txt_sec = s;
|
|
else if (strcmp(".devexit.text", secname) == 0)
|
|
maps[ARM_SEC_DEVEXIT].txt_sec = s;
|
|
}
|
|
|
|
for (i = 0; i < ARM_SEC_MAX; i++)
|
|
if (maps[i].unw_sec && maps[i].txt_sec)
|
|
mod->arch.unwind[i] =
|
|
unwind_table_add(maps[i].unw_sec->sh_addr,
|
|
maps[i].unw_sec->sh_size,
|
|
maps[i].txt_sec->sh_addr,
|
|
maps[i].txt_sec->sh_size);
|
|
#endif
|
|
#ifdef CONFIG_ARM_PATCH_PHYS_VIRT
|
|
s = find_mod_section(hdr, sechdrs, ".pv_table");
|
|
if (s)
|
|
fixup_pv_table((void *)s->sh_addr, s->sh_size);
|
|
#endif
|
|
s = find_mod_section(hdr, sechdrs, ".alt.smp.init");
|
|
if (s && !is_smp())
|
|
fixup_smp((void *)s->sh_addr, s->sh_size);
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
module_arch_cleanup(struct module *mod)
|
|
{
|
|
#ifdef CONFIG_ARM_UNWIND
|
|
int i;
|
|
|
|
for (i = 0; i < ARM_SEC_MAX; i++)
|
|
if (mod->arch.unwind[i])
|
|
unwind_table_del(mod->arch.unwind[i]);
|
|
#endif
|
|
}
|