337 строки
8.9 KiB
C
337 строки
8.9 KiB
C
/*
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* linux/arch/arm/kernel/module.c
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*
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* Copyright (C) 2002 Russell King.
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* Modified for nommu by Hyok S. Choi
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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 version 2 as
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* published by the Free Software Foundation.
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*
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* Module allocation method suggested by Andi Kleen.
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*/
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#include <linux/module.h>
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#include <linux/moduleloader.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/elf.h>
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#include <linux/vmalloc.h>
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <linux/gfp.h>
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#include <asm/pgtable.h>
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#include <asm/sections.h>
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#include <asm/smp_plat.h>
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#include <asm/unwind.h>
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#ifdef CONFIG_XIP_KERNEL
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/*
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* The XIP kernel text is mapped in the module area for modules and
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* some other stuff to work without any indirect relocations.
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* MODULES_VADDR is redefined here and not in asm/memory.h to avoid
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* recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off.
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*/
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#undef MODULES_VADDR
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#define MODULES_VADDR (((unsigned long)_etext + ~PMD_MASK) & PMD_MASK)
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#endif
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#ifdef CONFIG_MMU
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void *module_alloc(unsigned long size)
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{
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return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
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GFP_KERNEL, PAGE_KERNEL_EXEC, -1,
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__builtin_return_address(0));
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}
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#endif
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int
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apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
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unsigned int relindex, struct module *module)
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{
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Elf32_Shdr *symsec = sechdrs + symindex;
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Elf32_Shdr *relsec = sechdrs + relindex;
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Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
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Elf32_Rel *rel = (void *)relsec->sh_addr;
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unsigned int i;
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for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
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unsigned long loc;
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Elf32_Sym *sym;
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const char *symname;
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s32 offset;
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#ifdef CONFIG_THUMB2_KERNEL
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u32 upper, lower, sign, j1, j2;
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#endif
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offset = ELF32_R_SYM(rel->r_info);
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if (offset < 0 || offset > (symsec->sh_size / sizeof(Elf32_Sym))) {
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pr_err("%s: section %u reloc %u: bad relocation sym offset\n",
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module->name, relindex, i);
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return -ENOEXEC;
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}
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sym = ((Elf32_Sym *)symsec->sh_addr) + offset;
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symname = strtab + sym->st_name;
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if (rel->r_offset < 0 || rel->r_offset > dstsec->sh_size - sizeof(u32)) {
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pr_err("%s: section %u reloc %u sym '%s': out of bounds relocation, offset %d size %u\n",
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module->name, relindex, i, symname,
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rel->r_offset, dstsec->sh_size);
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return -ENOEXEC;
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}
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loc = dstsec->sh_addr + rel->r_offset;
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switch (ELF32_R_TYPE(rel->r_info)) {
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case R_ARM_NONE:
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/* ignore */
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break;
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case R_ARM_ABS32:
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*(u32 *)loc += sym->st_value;
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break;
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case R_ARM_PC24:
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case R_ARM_CALL:
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case R_ARM_JUMP24:
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offset = (*(u32 *)loc & 0x00ffffff) << 2;
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if (offset & 0x02000000)
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offset -= 0x04000000;
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offset += sym->st_value - loc;
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if (offset & 3 ||
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offset <= (s32)0xfe000000 ||
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offset >= (s32)0x02000000) {
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pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n",
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module->name, relindex, i, symname,
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ELF32_R_TYPE(rel->r_info), loc,
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sym->st_value);
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return -ENOEXEC;
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}
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offset >>= 2;
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*(u32 *)loc &= 0xff000000;
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*(u32 *)loc |= offset & 0x00ffffff;
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break;
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case R_ARM_V4BX:
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/* Preserve Rm and the condition code. Alter
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* other bits to re-code instruction as
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* MOV PC,Rm.
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*/
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*(u32 *)loc &= 0xf000000f;
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*(u32 *)loc |= 0x01a0f000;
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break;
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case R_ARM_PREL31:
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offset = *(u32 *)loc + sym->st_value - loc;
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*(u32 *)loc = offset & 0x7fffffff;
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break;
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case R_ARM_MOVW_ABS_NC:
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case R_ARM_MOVT_ABS:
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offset = *(u32 *)loc;
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offset = ((offset & 0xf0000) >> 4) | (offset & 0xfff);
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offset = (offset ^ 0x8000) - 0x8000;
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offset += sym->st_value;
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if (ELF32_R_TYPE(rel->r_info) == R_ARM_MOVT_ABS)
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offset >>= 16;
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*(u32 *)loc &= 0xfff0f000;
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*(u32 *)loc |= ((offset & 0xf000) << 4) |
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(offset & 0x0fff);
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break;
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#ifdef CONFIG_THUMB2_KERNEL
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case R_ARM_THM_CALL:
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case R_ARM_THM_JUMP24:
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upper = *(u16 *)loc;
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lower = *(u16 *)(loc + 2);
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/*
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* 25 bit signed address range (Thumb-2 BL and B.W
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* instructions):
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* S:I1:I2:imm10:imm11:0
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* where:
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* S = upper[10] = offset[24]
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* I1 = ~(J1 ^ S) = offset[23]
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* I2 = ~(J2 ^ S) = offset[22]
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* imm10 = upper[9:0] = offset[21:12]
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* imm11 = lower[10:0] = offset[11:1]
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* J1 = lower[13]
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* J2 = lower[11]
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*/
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sign = (upper >> 10) & 1;
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j1 = (lower >> 13) & 1;
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j2 = (lower >> 11) & 1;
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offset = (sign << 24) | ((~(j1 ^ sign) & 1) << 23) |
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((~(j2 ^ sign) & 1) << 22) |
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((upper & 0x03ff) << 12) |
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((lower & 0x07ff) << 1);
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if (offset & 0x01000000)
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offset -= 0x02000000;
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offset += sym->st_value - loc;
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/*
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* For function symbols, only Thumb addresses are
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* allowed (no interworking).
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*
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* For non-function symbols, the destination
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* has no specific ARM/Thumb disposition, so
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* the branch is resolved under the assumption
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* that interworking is not required.
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*/
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if ((ELF32_ST_TYPE(sym->st_info) == STT_FUNC &&
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!(offset & 1)) ||
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offset <= (s32)0xff000000 ||
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offset >= (s32)0x01000000) {
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pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n",
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module->name, relindex, i, symname,
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ELF32_R_TYPE(rel->r_info), loc,
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sym->st_value);
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return -ENOEXEC;
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}
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sign = (offset >> 24) & 1;
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j1 = sign ^ (~(offset >> 23) & 1);
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j2 = sign ^ (~(offset >> 22) & 1);
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*(u16 *)loc = (u16)((upper & 0xf800) | (sign << 10) |
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((offset >> 12) & 0x03ff));
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*(u16 *)(loc + 2) = (u16)((lower & 0xd000) |
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(j1 << 13) | (j2 << 11) |
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((offset >> 1) & 0x07ff));
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break;
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case R_ARM_THM_MOVW_ABS_NC:
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case R_ARM_THM_MOVT_ABS:
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upper = *(u16 *)loc;
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lower = *(u16 *)(loc + 2);
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/*
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* MOVT/MOVW instructions encoding in Thumb-2:
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*
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* i = upper[10]
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* imm4 = upper[3:0]
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* imm3 = lower[14:12]
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* imm8 = lower[7:0]
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*
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* imm16 = imm4:i:imm3:imm8
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*/
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offset = ((upper & 0x000f) << 12) |
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((upper & 0x0400) << 1) |
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((lower & 0x7000) >> 4) | (lower & 0x00ff);
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offset = (offset ^ 0x8000) - 0x8000;
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offset += sym->st_value;
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if (ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVT_ABS)
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offset >>= 16;
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*(u16 *)loc = (u16)((upper & 0xfbf0) |
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((offset & 0xf000) >> 12) |
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((offset & 0x0800) >> 1));
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*(u16 *)(loc + 2) = (u16)((lower & 0x8f00) |
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((offset & 0x0700) << 4) |
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(offset & 0x00ff));
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break;
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#endif
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default:
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printk(KERN_ERR "%s: unknown relocation: %u\n",
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module->name, ELF32_R_TYPE(rel->r_info));
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return -ENOEXEC;
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}
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}
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return 0;
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}
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struct mod_unwind_map {
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const Elf_Shdr *unw_sec;
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const Elf_Shdr *txt_sec;
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};
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static const Elf_Shdr *find_mod_section(const Elf32_Ehdr *hdr,
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const Elf_Shdr *sechdrs, const char *name)
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{
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const Elf_Shdr *s, *se;
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const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
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for (s = sechdrs, se = sechdrs + hdr->e_shnum; s < se; s++)
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if (strcmp(name, secstrs + s->sh_name) == 0)
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return s;
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return NULL;
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}
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extern void fixup_pv_table(const void *, unsigned long);
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extern void fixup_smp(const void *, unsigned long);
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int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,
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struct module *mod)
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{
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const Elf_Shdr *s = NULL;
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#ifdef CONFIG_ARM_UNWIND
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const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
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const Elf_Shdr *sechdrs_end = sechdrs + hdr->e_shnum;
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struct mod_unwind_map maps[ARM_SEC_MAX];
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int i;
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memset(maps, 0, sizeof(maps));
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for (s = sechdrs; s < sechdrs_end; s++) {
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const char *secname = secstrs + s->sh_name;
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if (!(s->sh_flags & SHF_ALLOC))
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continue;
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if (strcmp(".ARM.exidx.init.text", secname) == 0)
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maps[ARM_SEC_INIT].unw_sec = s;
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else if (strcmp(".ARM.exidx", secname) == 0)
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maps[ARM_SEC_CORE].unw_sec = s;
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else if (strcmp(".ARM.exidx.exit.text", secname) == 0)
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maps[ARM_SEC_EXIT].unw_sec = s;
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else if (strcmp(".init.text", secname) == 0)
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maps[ARM_SEC_INIT].txt_sec = s;
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else if (strcmp(".text", secname) == 0)
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maps[ARM_SEC_CORE].txt_sec = s;
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else if (strcmp(".exit.text", secname) == 0)
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maps[ARM_SEC_EXIT].txt_sec = s;
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}
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for (i = 0; i < ARM_SEC_MAX; i++)
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if (maps[i].unw_sec && maps[i].txt_sec)
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mod->arch.unwind[i] =
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unwind_table_add(maps[i].unw_sec->sh_addr,
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maps[i].unw_sec->sh_size,
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maps[i].txt_sec->sh_addr,
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maps[i].txt_sec->sh_size);
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#endif
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#ifdef CONFIG_ARM_PATCH_PHYS_VIRT
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s = find_mod_section(hdr, sechdrs, ".pv_table");
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if (s)
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fixup_pv_table((void *)s->sh_addr, s->sh_size);
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#endif
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s = find_mod_section(hdr, sechdrs, ".alt.smp.init");
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if (s && !is_smp())
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#ifdef CONFIG_SMP_ON_UP
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fixup_smp((void *)s->sh_addr, s->sh_size);
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#else
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return -EINVAL;
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#endif
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return 0;
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}
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void
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module_arch_cleanup(struct module *mod)
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{
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#ifdef CONFIG_ARM_UNWIND
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int i;
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for (i = 0; i < ARM_SEC_MAX; i++)
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if (mod->arch.unwind[i])
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unwind_table_del(mod->arch.unwind[i]);
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#endif
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}
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