#include <linux/err.h>
#include <linux/vmalloc.h>
#include <linux/bug.h>
+#include <linux/uaccess.h>
#include <asm/module.h>
-#include <asm/uaccess.h>
+#include <asm/sections.h>
#include <asm/firmware.h>
+#include <asm/code-patching.h>
+#include <linux/sort.h>
#include "setup.h"
different addend) */
static unsigned int count_relocs(const Elf64_Rela *rela, unsigned int num)
{
- unsigned int i, j, ret = 0;
+ unsigned int i, r_info, r_addend, _count_relocs;
/* FIXME: Only count external ones --RR */
- /* Sure, this is order(n^2), but it's usually short, and not
- time critical */
- for (i = 0; i < num; i++) {
+ _count_relocs = 0;
+ r_info = 0;
+ r_addend = 0;
+ for (i = 0; i < num; i++)
/* Only count 24-bit relocs, others don't need stubs */
- if (ELF64_R_TYPE(rela[i].r_info) != R_PPC_REL24)
- continue;
- for (j = 0; j < i; j++) {
- /* If this addend appeared before, it's
- already been counted */
- if (rela[i].r_info == rela[j].r_info
- && rela[i].r_addend == rela[j].r_addend)
- break;
+ if (ELF64_R_TYPE(rela[i].r_info) == R_PPC_REL24 &&
+ (r_info != ELF64_R_SYM(rela[i].r_info) ||
+ r_addend != rela[i].r_addend)) {
+ _count_relocs++;
+ r_info = ELF64_R_SYM(rela[i].r_info);
+ r_addend = rela[i].r_addend;
}
- if (j == i) ret++;
- }
- return ret;
+
+ return _count_relocs;
}
-void *module_alloc(unsigned long size)
+static int relacmp(const void *_x, const void *_y)
{
- if (size == 0)
- return NULL;
-
- return vmalloc_exec(size);
+ const Elf64_Rela *x, *y;
+
+ y = (Elf64_Rela *)_x;
+ x = (Elf64_Rela *)_y;
+
+ /* Compare the entire r_info (as opposed to ELF64_R_SYM(r_info) only) to
+ * make the comparison cheaper/faster. It won't affect the sorting or
+ * the counting algorithms' performance
+ */
+ if (x->r_info < y->r_info)
+ return -1;
+ else if (x->r_info > y->r_info)
+ return 1;
+ else if (x->r_addend < y->r_addend)
+ return -1;
+ else if (x->r_addend > y->r_addend)
+ return 1;
+ else
+ return 0;
}
-/* Free memory returned from module_alloc */
-void module_free(struct module *mod, void *module_region)
+static void relaswap(void *_x, void *_y, int size)
{
- vfree(module_region);
- /* FIXME: If module_region == mod->init_region, trim exception
- table entries. */
+ uint64_t *x, *y, tmp;
+ int i;
+
+ y = (uint64_t *)_x;
+ x = (uint64_t *)_y;
+
+ for (i = 0; i < sizeof(Elf64_Rela) / sizeof(uint64_t); i++) {
+ tmp = x[i];
+ x[i] = y[i];
+ y[i] = tmp;
+ }
}
/* Get size of potential trampolines required. */
DEBUGP("Ptr: %p. Number: %lu\n",
(void *)sechdrs[i].sh_addr,
sechdrs[i].sh_size / sizeof(Elf64_Rela));
+
+ /* Sort the relocation information based on a symbol and
+ * addend key. This is a stable O(n*log n) complexity
+ * alogrithm but it will reduce the complexity of
+ * count_relocs() to linear complexity O(n)
+ */
+ sort((void *)sechdrs[i].sh_addr,
+ sechdrs[i].sh_size / sizeof(Elf64_Rela),
+ sizeof(Elf64_Rela), relacmp, relaswap);
+
relocs += count_relocs((void *)sechdrs[i].sh_addr,
sechdrs[i].sh_size
/ sizeof(Elf64_Rela));
restore r2. */
static int restore_r2(u32 *instruction, struct module *me)
{
- if (*instruction != 0x60000000) {
+ if (*instruction != PPC_NOP_INSTR) {
printk("%s: Expect noop after relocate, got %08x\n",
me->name, *instruction);
return 0;
/* Simply set it */
*(u32 *)location = value;
break;
-
+
case R_PPC64_ADDR64:
/* Simply set it */
*(unsigned long *)location = value;
}
/* Only replace bits 2 through 26 */
- *(uint32_t *)location
+ *(uint32_t *)location
= (*(uint32_t *)location & ~0x03fffffc)
| (value & 0x03fffffc);
break;
return 0;
}
-LIST_HEAD(module_bug_list);
-
-static const Elf_Shdr *find_section(const Elf_Ehdr *hdr,
- const Elf_Shdr *sechdrs,
- const char *name)
-{
- char *secstrings;
- unsigned int i;
-
- secstrings = (char *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
- for (i = 1; i < hdr->e_shnum; i++)
- if (strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
- return &sechdrs[i];
- return NULL;
-}
-
-int module_finalize(const Elf_Ehdr *hdr,
- const Elf_Shdr *sechdrs, struct module *me)
-{
- const Elf_Shdr *sect;
- int err;
-
- err = module_bug_finalize(hdr, sechdrs, me);
- if (err)
- return err;
-
- /* Apply feature fixups */
- sect = find_section(hdr, sechdrs, "__ftr_fixup");
- if (sect != NULL)
- do_feature_fixups(cur_cpu_spec->cpu_features,
- (void *)sect->sh_addr,
- (void *)sect->sh_addr + sect->sh_size);
-
- sect = find_section(hdr, sechdrs, "__fw_ftr_fixup");
- if (sect != NULL)
- do_feature_fixups(powerpc_firmware_features,
- (void *)sect->sh_addr,
- (void *)sect->sh_addr + sect->sh_size);
-
- return 0;
-}
-
-void module_arch_cleanup(struct module *mod)
-{
- module_bug_cleanup(mod);
-}
-
-struct bug_entry *module_find_bug(unsigned long bugaddr)
+void *dereference_function_descriptor(void *ptr)
{
- struct mod_arch_specific *mod;
- unsigned int i;
- struct bug_entry *bug;
+ struct ppc64_opd_entry *desc = ptr;
+ void *p;
- list_for_each_entry(mod, &module_bug_list, bug_list) {
- bug = mod->bug_table;
- for (i = 0; i < mod->num_bugs; ++i, ++bug)
- if (bugaddr == bug->bug_addr)
- return bug;
- }
- return NULL;
+ if (!probe_kernel_address(&desc->funcaddr, p))
+ ptr = p;
+ return ptr;
}
git.openpandora.org / pandora-kernel.git / blobdiff