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Blackfin: reject outdated/unused/wrong relocation types

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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>
This commit is contained in:
Robin Getz 2009-06-25 15:49:38 +00:00 committed by Mike Frysinger
parent c014e15a2f
commit 22532578ee
1 changed files with 8 additions and 34 deletions
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42
arch/blackfin/kernel/module.c
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@ -243,40 +243,6 @@ apply_relocate_add(Elf_Shdr * sechdrs, const char *strtab,
#endif
switch (ELF32_R_TYPE(rel[i].r_info)) {
case R_BFIN_PCREL24:
case R_BFIN_PCREL24_JUMP_L:
/* Add the value, subtract its postition */
location16 =
(uint16_t *) (sechdrs[sechdrs[relsec].sh_info].
sh_addr + rel[i].r_offset - 2);
location32 = (uint32_t *) location16;
value -= (uint32_t) location32;
value >>= 1;
if ((value & 0xFF000000) != 0 &&
(value & 0xFF000000) != 0xFF000000) {
printk(KERN_ERR "module %s: relocation overflow\n",
mod->name);
return -ENOEXEC;
}
pr_debug("value is %x, before %x-%x after %x-%x\n", value,
*location16, *(location16 + 1),
(*location16 & 0xff00) | (value >> 16 & 0x00ff),
value & 0xffff);
*location16 =
(*location16 & 0xff00) | (value >> 16 & 0x00ff);
*(location16 + 1) = value & 0xffff;
break;
case R_BFIN_PCREL12_JUMP:
case R_BFIN_PCREL12_JUMP_S:
value -= (uint32_t) location32;
value >>= 1;
*location16 = (value & 0xfff);
break;
case R_BFIN_PCREL10:
value -= (uint32_t) location32;
value >>= 1;
*location16 = (value & 0x3ff);
break;
case R_BFIN_LUIMM16:
pr_debug("before %x after %x\n", *location16,
(value & 0xffff));
@ -302,6 +268,14 @@ apply_relocate_add(Elf_Shdr * sechdrs, const char *strtab,
pr_debug("before %x after %x\n", *location32, value);
*location32 = value;
break;
case R_BFIN_PCREL24:
case R_BFIN_PCREL24_JUMP_L:
case R_BFIN_PCREL12_JUMP:
case R_BFIN_PCREL12_JUMP_S:
case R_BFIN_PCREL10:
printk(KERN_ERR "module %s: Unsupported relocation: %u (no -mlong-calls?)\n"
mod->name, ELF32_R_TYPE(rel[i].r_info));
return -ENOEXEC;
default:
printk(KERN_ERR "module %s: Unknown relocation: %u\n",
mod->name, ELF32_R_TYPE(rel[i].r_info));