204 lines
6.2 KiB
C
204 lines
6.2 KiB
C
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/* Kernel module help for M32R.
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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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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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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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#include <linux/moduleloader.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/kernel.h>
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#if 0
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#define DEBUGP printk
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#else
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#define DEBUGP(fmt...)
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#endif
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#define COPY_UNALIGNED_WORD(sw, tw, align) \
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{ \
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void *__s = &(sw), *__t = &(tw); \
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unsigned short *__s2 = __s, *__t2 =__t; \
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unsigned char *__s1 = __s, *__t1 =__t; \
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switch ((align)) \
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{ \
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case 0: \
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*(unsigned long *) __t = *(unsigned long *) __s; \
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break; \
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case 2: \
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*__t2++ = *__s2++; \
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*__t2 = *__s2; \
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break; \
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default: \
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*__t1++ = *__s1++; \
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*__t1++ = *__s1++; \
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*__t1++ = *__s1++; \
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*__t1 = *__s1; \
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break; \
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} \
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}
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#define COPY_UNALIGNED_HWORD(sw, tw, align) \
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{ \
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void *__s = &(sw), *__t = &(tw); \
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unsigned short *__s2 = __s, *__t2 =__t; \
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unsigned char *__s1 = __s, *__t1 =__t; \
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switch ((align)) \
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{ \
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case 0: \
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*__t2 = *__s2; \
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break; \
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default: \
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*__t1++ = *__s1++; \
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*__t1 = *__s1; \
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break; \
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} \
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}
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int apply_relocate_add(Elf32_Shdr *sechdrs,
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const char *strtab,
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unsigned int symindex,
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unsigned int relsec,
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struct module *me)
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{
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unsigned int i;
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Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
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Elf32_Sym *sym;
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Elf32_Addr relocation;
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uint32_t *location;
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uint32_t value;
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unsigned short *hlocation;
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unsigned short hvalue;
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int svalue;
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int align;
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DEBUGP("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. Note that all
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undefined symbols have been resolved. */
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sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
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+ ELF32_R_SYM(rel[i].r_info);
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relocation = sym->st_value + rel[i].r_addend;
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align = (int)location & 3;
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switch (ELF32_R_TYPE(rel[i].r_info)) {
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case R_M32R_32_RELA:
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COPY_UNALIGNED_WORD (*location, value, align);
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value += relocation;
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COPY_UNALIGNED_WORD (value, *location, align);
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break;
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case R_M32R_HI16_ULO_RELA:
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COPY_UNALIGNED_WORD (*location, value, align);
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relocation = (relocation >>16) & 0xffff;
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/* RELA must has 0 at relocation field. */
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value += relocation;
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COPY_UNALIGNED_WORD (value, *location, align);
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break;
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case R_M32R_HI16_SLO_RELA:
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COPY_UNALIGNED_WORD (*location, value, align);
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if (relocation & 0x8000) relocation += 0x10000;
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relocation = (relocation >>16) & 0xffff;
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/* RELA must has 0 at relocation field. */
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value += relocation;
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COPY_UNALIGNED_WORD (value, *location, align);
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break;
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case R_M32R_16_RELA:
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hlocation = (unsigned short *)location;
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relocation = relocation & 0xffff;
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/* RELA must has 0 at relocation field. */
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hvalue = relocation;
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COPY_UNALIGNED_WORD (hvalue, *hlocation, align);
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break;
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case R_M32R_SDA16_RELA:
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case R_M32R_LO16_RELA:
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COPY_UNALIGNED_WORD (*location, value, align);
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relocation = relocation & 0xffff;
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/* RELA must has 0 at relocation field. */
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value += relocation;
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COPY_UNALIGNED_WORD (value, *location, align);
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break;
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case R_M32R_24_RELA:
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COPY_UNALIGNED_WORD (*location, value, align);
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relocation = relocation & 0xffffff;
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/* RELA must has 0 at relocation field. */
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value += relocation;
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COPY_UNALIGNED_WORD (value, *location, align);
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break;
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case R_M32R_18_PCREL_RELA:
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relocation = (relocation - (Elf32_Addr) location);
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if (relocation < -0x20000 || 0x1fffc < relocation)
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{
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printk(KERN_ERR "module %s: relocation overflow: %u\n",
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me->name, relocation);
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return -ENOEXEC;
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}
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COPY_UNALIGNED_WORD (*location, value, align);
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if (value & 0xffff)
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{
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/* RELA must has 0 at relocation field. */
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printk(KERN_ERR "module %s: illegal relocation field: %u\n",
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me->name, value);
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return -ENOEXEC;
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}
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relocation = (relocation >> 2) & 0xffff;
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value += relocation;
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COPY_UNALIGNED_WORD (value, *location, align);
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break;
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case R_M32R_10_PCREL_RELA:
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hlocation = (unsigned short *)location;
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relocation = (relocation - (Elf32_Addr) location);
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COPY_UNALIGNED_HWORD (*hlocation, hvalue, align);
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svalue = (int)hvalue;
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svalue = (signed char)svalue << 2;
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relocation += svalue;
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relocation = (relocation >> 2) & 0xff;
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hvalue = hvalue & 0xff00;
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hvalue += relocation;
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COPY_UNALIGNED_HWORD (hvalue, *hlocation, align);
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break;
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case R_M32R_26_PCREL_RELA:
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relocation = (relocation - (Elf32_Addr) location);
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if (relocation < -0x2000000 || 0x1fffffc < relocation)
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{
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printk(KERN_ERR "module %s: relocation overflow: %u\n",
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me->name, relocation);
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return -ENOEXEC;
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}
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COPY_UNALIGNED_WORD (*location, value, align);
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if (value & 0xffffff)
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{
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/* RELA must has 0 at relocation field. */
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printk(KERN_ERR "module %s: illegal relocation field: %u\n",
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me->name, value);
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return -ENOEXEC;
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}
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relocation = (relocation >> 2) & 0xffffff;
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value += relocation;
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COPY_UNALIGNED_WORD (value, *location, align);
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break;
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default:
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printk(KERN_ERR "module %s: Unknown relocation: %u\n",
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me->name, ELF32_R_TYPE(rel[i].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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