1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
123 lines
2.9 KiB
C
123 lines
2.9 KiB
C
#include <linux/moduleloader.h>
|
|
#include <linux/elf.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/string.h>
|
|
#include <linux/kernel.h>
|
|
|
|
#if 0
|
|
#define DEBUGP printk
|
|
#else
|
|
#define DEBUGP(fmt...)
|
|
#endif
|
|
|
|
void *module_alloc(unsigned long size)
|
|
{
|
|
if (size == 0)
|
|
return NULL;
|
|
return vmalloc(size);
|
|
}
|
|
|
|
|
|
/* Free memory returned from module_alloc */
|
|
void module_free(struct module *mod, void *module_region)
|
|
{
|
|
vfree(module_region);
|
|
/* FIXME: If module_region == mod->init_region, trim exception
|
|
table entries. */
|
|
}
|
|
|
|
/* We don't need anything special. */
|
|
int module_frob_arch_sections(Elf_Ehdr *hdr,
|
|
Elf_Shdr *sechdrs,
|
|
char *secstrings,
|
|
struct module *mod)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int apply_relocate(Elf32_Shdr *sechdrs,
|
|
const char *strtab,
|
|
unsigned int symindex,
|
|
unsigned int relsec,
|
|
struct module *me)
|
|
{
|
|
printk(KERN_ERR "module %s: RELOCATION unsupported\n",
|
|
me->name);
|
|
return -ENOEXEC;
|
|
}
|
|
|
|
int apply_relocate_add(Elf32_Shdr *sechdrs,
|
|
const char *strtab,
|
|
unsigned int symindex,
|
|
unsigned int relsec,
|
|
struct module *me)
|
|
{
|
|
unsigned int i;
|
|
Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
|
|
|
|
DEBUGP("Applying relocate section %u to %u\n", relsec,
|
|
sechdrs[relsec].sh_info);
|
|
for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
|
|
/* This is where to make the change */
|
|
uint32_t *loc = (uint32_t *)(sechdrs[sechdrs[relsec].sh_info].sh_addr
|
|
+ rela[i].r_offset);
|
|
/* This is the symbol it is referring to. Note that all
|
|
undefined symbols have been resolved. */
|
|
Elf32_Sym *sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
|
|
+ ELF32_R_SYM(rela[i].r_info);
|
|
uint32_t v = sym->st_value + rela[i].r_addend;
|
|
|
|
switch (ELF32_R_TYPE(rela[i].r_info)) {
|
|
case R_H8_DIR24R8:
|
|
loc = (uint32_t *)((uint32_t)loc - 1);
|
|
*loc = (*loc & 0xff000000) | ((*loc & 0xffffff) + v);
|
|
break;
|
|
case R_H8_DIR24A8:
|
|
if (ELF32_R_SYM(rela[i].r_info))
|
|
*loc += v;
|
|
break;
|
|
case R_H8_DIR32:
|
|
case R_H8_DIR32A16:
|
|
*loc += v;
|
|
break;
|
|
case R_H8_PCREL16:
|
|
v -= (unsigned long)loc + 2;
|
|
if ((Elf32_Sword)v > 0x7fff ||
|
|
(Elf32_Sword)v < -(Elf32_Sword)0x8000)
|
|
goto overflow;
|
|
else
|
|
*(unsigned short *)loc = v;
|
|
break;
|
|
case R_H8_PCREL8:
|
|
v -= (unsigned long)loc + 1;
|
|
if ((Elf32_Sword)v > 0x7f ||
|
|
(Elf32_Sword)v < -(Elf32_Sword)0x80)
|
|
goto overflow;
|
|
else
|
|
*(unsigned char *)loc = v;
|
|
break;
|
|
default:
|
|
printk(KERN_ERR "module %s: Unknown relocation: %u\n",
|
|
me->name, ELF32_R_TYPE(rela[i].r_info));
|
|
return -ENOEXEC;
|
|
}
|
|
}
|
|
return 0;
|
|
overflow:
|
|
printk(KERN_ERR "module %s: relocation offset overflow: %08x\n",
|
|
me->name, rela[i].r_offset);
|
|
return -ENOEXEC;
|
|
}
|
|
|
|
int module_finalize(const Elf_Ehdr *hdr,
|
|
const Elf_Shdr *sechdrs,
|
|
struct module *me)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
void module_arch_cleanup(struct module *mod)
|
|
{
|
|
}
|