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authorBernd Schmidt <bernds_cb1@t-online.de>2009-01-07 23:14:39 +0800
committerBryan Wu <cooloney@kernel.org>2009-01-07 23:14:39 +0800
commitd1a853057a13e63c40c9b8715e585af15f1b141a (patch)
treecefd27448fa56585ad000417308b508a81c1f005 /arch/blackfin/kernel
parent2eddbadaebdf77a52d5cccc7cdd116656f1cf1f9 (diff)
Blackfin arch: Remove all traces of the relocation stack
Remove all traces of the relocation stack. It's been removed from binutils for years now. Add a sanity overflow check to pcrel24 relocations to catch modules that were built without -mlong-calls. Signed-off-by: Bernd Schmidt <bernds_cb1@t-online.de> Signed-off-by: Bryan Wu <cooloney@kernel.org>
Diffstat (limited to 'arch/blackfin/kernel')
-rw-r--r--arch/blackfin/kernel/module.c139
1 files changed, 7 insertions, 132 deletions
diff --git a/arch/blackfin/kernel/module.c b/arch/blackfin/kernel/module.c
index 2e14cadd430..1bd7f2d018a 100644
--- a/arch/blackfin/kernel/module.c
+++ b/arch/blackfin/kernel/module.c
@@ -37,111 +37,6 @@
#include <asm/dma.h>
#include <asm/cacheflush.h>
-/*
- * handle arithmetic relocations.
- * See binutils/bfd/elf32-bfin.c for more details
- */
-#define RELOC_STACK_SIZE 100
-static uint32_t reloc_stack[RELOC_STACK_SIZE];
-static unsigned int reloc_stack_tos;
-
-#define is_reloc_stack_empty() ((reloc_stack_tos > 0)?0:1)
-
-static void reloc_stack_push(uint32_t value)
-{
- reloc_stack[reloc_stack_tos++] = value;
-}
-
-static uint32_t reloc_stack_pop(void)
-{
- return reloc_stack[--reloc_stack_tos];
-}
-
-static uint32_t reloc_stack_operate(unsigned int oper, struct module *mod)
-{
- uint32_t value;
-
- switch (oper) {
- case R_add:
- value = reloc_stack[reloc_stack_tos - 2] +
- reloc_stack[reloc_stack_tos - 1];
- reloc_stack_tos -= 2;
- break;
- case R_sub:
- value = reloc_stack[reloc_stack_tos - 2] -
- reloc_stack[reloc_stack_tos - 1];
- reloc_stack_tos -= 2;
- break;
- case R_mult:
- value = reloc_stack[reloc_stack_tos - 2] *
- reloc_stack[reloc_stack_tos - 1];
- reloc_stack_tos -= 2;
- break;
- case R_div:
- value = reloc_stack[reloc_stack_tos - 2] /
- reloc_stack[reloc_stack_tos - 1];
- reloc_stack_tos -= 2;
- break;
- case R_mod:
- value = reloc_stack[reloc_stack_tos - 2] %
- reloc_stack[reloc_stack_tos - 1];
- reloc_stack_tos -= 2;
- break;
- case R_lshift:
- value = reloc_stack[reloc_stack_tos - 2] <<
- reloc_stack[reloc_stack_tos - 1];
- reloc_stack_tos -= 2;
- break;
- case R_rshift:
- value = reloc_stack[reloc_stack_tos - 2] >>
- reloc_stack[reloc_stack_tos - 1];
- reloc_stack_tos -= 2;
- break;
- case R_and:
- value = reloc_stack[reloc_stack_tos - 2] &
- reloc_stack[reloc_stack_tos - 1];
- reloc_stack_tos -= 2;
- break;
- case R_or:
- value = reloc_stack[reloc_stack_tos - 2] |
- reloc_stack[reloc_stack_tos - 1];
- reloc_stack_tos -= 2;
- break;
- case R_xor:
- value = reloc_stack[reloc_stack_tos - 2] ^
- reloc_stack[reloc_stack_tos - 1];
- reloc_stack_tos -= 2;
- break;
- case R_land:
- value = reloc_stack[reloc_stack_tos - 2] &&
- reloc_stack[reloc_stack_tos - 1];
- reloc_stack_tos -= 2;
- break;
- case R_lor:
- value = reloc_stack[reloc_stack_tos - 2] ||
- reloc_stack[reloc_stack_tos - 1];
- reloc_stack_tos -= 2;
- break;
- case R_neg:
- value = -reloc_stack[reloc_stack_tos - 1];
- reloc_stack_tos--;
- break;
- case R_comp:
- value = ~reloc_stack[reloc_stack_tos - 1];
- reloc_stack_tos -= 1;
- break;
- default:
- printk(KERN_WARNING "module %s: unhandled reloction\n",
- mod->name);
- return 0;
- }
-
- /* now push the new value back on stack */
- reloc_stack_push(value);
-
- return value;
-}
-
void *module_alloc(unsigned long size)
{
if (size == 0)
@@ -334,11 +229,7 @@ apply_relocate_add(Elf_Shdr * sechdrs, const char *strtab,
undefined symbols have been resolved. */
sym = (Elf32_Sym *) sechdrs[symindex].sh_addr
+ ELF32_R_SYM(rel[i].r_info);
- if (is_reloc_stack_empty()) {
- value = sym->st_value;
- } else {
- value = reloc_stack_pop();
- }
+ value = sym->st_value;
value += rel[i].r_addend;
pr_debug("location is %x, value is %x type is %d \n",
(unsigned int) location32, value,
@@ -361,6 +252,12 @@ apply_relocate_add(Elf_Shdr * sechdrs, const char *strtab,
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),
@@ -405,28 +302,6 @@ apply_relocate_add(Elf_Shdr * sechdrs, const char *strtab,
pr_debug("before %x after %x\n", *location32, value);
*location32 = value;
break;
- case R_push:
- reloc_stack_push(value);
- break;
- case R_const:
- reloc_stack_push(rel[i].r_addend);
- break;
- case R_add:
- case R_sub:
- case R_mult:
- case R_div:
- case R_mod:
- case R_lshift:
- case R_rshift:
- case R_and:
- case R_or:
- case R_xor:
- case R_land:
- case R_lor:
- case R_neg:
- case R_comp:
- reloc_stack_operate(ELF32_R_TYPE(rel[i].r_info), mod);
- break;
default:
printk(KERN_ERR "module %s: Unknown relocation: %u\n",
mod->name, ELF32_R_TYPE(rel[i].r_info));