From 22532578ee0f8725e0155e528c29ff992c1950c7 Mon Sep 17 00:00:00 2001 From: Robin Getz Date: Thu, 25 Jun 2009 15:49:38 +0000 Subject: [PATCH] Blackfin: reject outdated/unused/wrong relocation types All kernel modules are required to be built with -mlong-calls and thus should not generate any of these relocations.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 Signed-off-by: Mike Frysinger --- arch/blackfin/kernel/module.c | 42 ++++++++---------------------------------- 1 file changed, 8 insertions(+), 34 deletions(-) diff --git a/arch/blackfin/kernel/module.c b/arch/blackfin/kernel/module.c index d5aee36..bb94078 100644 --- a/arch/blackfin/kernel/module.c +++ b/arch/blackfin/kernel/module.c @@ -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)); -- 2.7.4