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Blackfin: reject outdated/unused/wrong relocation types
All kernel modules are required to be built with -mlong-calls and thus should not generate any of these relocations. If they do, it means the module has not been compiled properly, so rather than trying to handle them (and running into random run time errors) just error out on module load to force the module to be compiled correctly. Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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parent
c014e15a2f
commit
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1 changed files with 8 additions and 34 deletions
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@ -243,40 +243,6 @@ apply_relocate_add(Elf_Shdr * sechdrs, const char *strtab,
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#endif
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switch (ELF32_R_TYPE(rel[i].r_info)) {
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case R_BFIN_PCREL24:
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case R_BFIN_PCREL24_JUMP_L:
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/* Add the value, subtract its postition */
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location16 =
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(uint16_t *) (sechdrs[sechdrs[relsec].sh_info].
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sh_addr + rel[i].r_offset - 2);
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location32 = (uint32_t *) location16;
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value -= (uint32_t) location32;
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value >>= 1;
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if ((value & 0xFF000000) != 0 &&
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(value & 0xFF000000) != 0xFF000000) {
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printk(KERN_ERR "module %s: relocation overflow\n",
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mod->name);
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return -ENOEXEC;
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}
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pr_debug("value is %x, before %x-%x after %x-%x\n", value,
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*location16, *(location16 + 1),
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(*location16 & 0xff00) | (value >> 16 & 0x00ff),
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value & 0xffff);
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*location16 =
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(*location16 & 0xff00) | (value >> 16 & 0x00ff);
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*(location16 + 1) = value & 0xffff;
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break;
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case R_BFIN_PCREL12_JUMP:
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case R_BFIN_PCREL12_JUMP_S:
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value -= (uint32_t) location32;
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value >>= 1;
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*location16 = (value & 0xfff);
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break;
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case R_BFIN_PCREL10:
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value -= (uint32_t) location32;
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value >>= 1;
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*location16 = (value & 0x3ff);
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break;
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case R_BFIN_LUIMM16:
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pr_debug("before %x after %x\n", *location16,
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(value & 0xffff));
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@ -302,6 +268,14 @@ apply_relocate_add(Elf_Shdr * sechdrs, const char *strtab,
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pr_debug("before %x after %x\n", *location32, value);
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*location32 = value;
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break;
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case R_BFIN_PCREL24:
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case R_BFIN_PCREL24_JUMP_L:
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case R_BFIN_PCREL12_JUMP:
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case R_BFIN_PCREL12_JUMP_S:
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case R_BFIN_PCREL10:
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printk(KERN_ERR "module %s: Unsupported relocation: %u (no -mlong-calls?)\n"
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mod->name, ELF32_R_TYPE(rel[i].r_info));
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return -ENOEXEC;
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default:
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printk(KERN_ERR "module %s: Unknown relocation: %u\n",
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mod->name, ELF32_R_TYPE(rel[i].r_info));
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