123 lines
3.2 KiB
C
123 lines
3.2 KiB
C
/*
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* Port on Texas Instruments TMS320C6x architecture
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*
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* Copyright (C) 2005, 2009, 2010, 2011 Texas Instruments Incorporated
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* Author: Thomas Charleux (thomas.charleux@jaluna.com)
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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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*/
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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/kernel.h>
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static inline int fixup_pcr(u32 *ip, Elf32_Addr dest, u32 maskbits, int shift)
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{
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u32 opcode;
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long ep = (long)ip & ~31;
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long delta = ((long)dest - ep) >> 2;
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long mask = (1 << maskbits) - 1;
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if ((delta >> (maskbits - 1)) == 0 ||
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(delta >> (maskbits - 1)) == -1) {
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opcode = *ip;
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opcode &= ~(mask << shift);
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opcode |= ((delta & mask) << shift);
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*ip = opcode;
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pr_debug("REL PCR_S%d[%p] dest[%p] opcode[%08x]\n",
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maskbits, ip, (void *)dest, opcode);
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return 0;
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}
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pr_err("PCR_S%d reloc %p -> %p out of range!\n",
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maskbits, ip, (void *)dest);
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return -1;
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}
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/*
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* apply a RELA relocation
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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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Elf32_Rela *rel = (void *) sechdrs[relsec].sh_addr;
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Elf_Sym *sym;
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u32 *location, opcode;
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unsigned int i;
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Elf32_Addr v;
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Elf_Addr offset = 0;
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pr_debug("Applying relocate section %u to %u with offset 0x%x\n",
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relsec, sechdrs[relsec].sh_info, offset);
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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 - 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 = (Elf_Sym *)sechdrs[symindex].sh_addr
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+ ELF32_R_SYM(rel[i].r_info);
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/* this is the adjustment to be made */
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v = sym->st_value + rel[i].r_addend;
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switch (ELF32_R_TYPE(rel[i].r_info)) {
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case R_C6000_ABS32:
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pr_debug("RELA ABS32: [%p] = 0x%x\n", location, v);
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*location = v;
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break;
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case R_C6000_ABS16:
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pr_debug("RELA ABS16: [%p] = 0x%x\n", location, v);
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*(u16 *)location = v;
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break;
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case R_C6000_ABS8:
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pr_debug("RELA ABS8: [%p] = 0x%x\n", location, v);
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*(u8 *)location = v;
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break;
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case R_C6000_ABS_L16:
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opcode = *location;
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opcode &= ~0x7fff80;
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opcode |= ((v & 0xffff) << 7);
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pr_debug("RELA ABS_L16[%p] v[0x%x] opcode[0x%x]\n",
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location, v, opcode);
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*location = opcode;
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break;
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case R_C6000_ABS_H16:
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opcode = *location;
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opcode &= ~0x7fff80;
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opcode |= ((v >> 9) & 0x7fff80);
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pr_debug("RELA ABS_H16[%p] v[0x%x] opcode[0x%x]\n",
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location, v, opcode);
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*location = opcode;
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break;
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case R_C6000_PCR_S21:
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if (fixup_pcr(location, v, 21, 7))
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return -ENOEXEC;
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break;
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case R_C6000_PCR_S12:
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if (fixup_pcr(location, v, 12, 16))
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return -ENOEXEC;
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break;
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case R_C6000_PCR_S10:
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if (fixup_pcr(location, v, 10, 13))
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return -ENOEXEC;
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break;
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default:
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pr_err("module %s: Unknown RELA 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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