summaryrefslogtreecommitdiff
path: root/ANDROID_3.4.5/arch/powerpc/kernel/module_32.c
diff options
context:
space:
mode:
Diffstat (limited to 'ANDROID_3.4.5/arch/powerpc/kernel/module_32.c')
-rw-r--r--ANDROID_3.4.5/arch/powerpc/kernel/module_32.c308
1 files changed, 0 insertions, 308 deletions
diff --git a/ANDROID_3.4.5/arch/powerpc/kernel/module_32.c b/ANDROID_3.4.5/arch/powerpc/kernel/module_32.c
deleted file mode 100644
index 2e3200ca..00000000
--- a/ANDROID_3.4.5/arch/powerpc/kernel/module_32.c
+++ /dev/null
@@ -1,308 +0,0 @@
-/* Kernel module help for PPC.
- Copyright (C) 2001 Rusty Russell.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-*/
-#include <linux/module.h>
-#include <linux/moduleloader.h>
-#include <linux/elf.h>
-#include <linux/vmalloc.h>
-#include <linux/fs.h>
-#include <linux/string.h>
-#include <linux/kernel.h>
-#include <linux/ftrace.h>
-#include <linux/cache.h>
-#include <linux/bug.h>
-#include <linux/sort.h>
-
-#include "setup.h"
-
-#if 0
-#define DEBUGP printk
-#else
-#define DEBUGP(fmt , ...)
-#endif
-
-/* Count how many different relocations (different symbol, different
- addend) */
-static unsigned int count_relocs(const Elf32_Rela *rela, unsigned int num)
-{
- unsigned int i, r_info, r_addend, _count_relocs;
-
- _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 (ELF32_R_TYPE(rela[i].r_info) == R_PPC_REL24 &&
- (r_info != ELF32_R_SYM(rela[i].r_info) ||
- r_addend != rela[i].r_addend)) {
- _count_relocs++;
- r_info = ELF32_R_SYM(rela[i].r_info);
- r_addend = rela[i].r_addend;
- }
-
-#ifdef CONFIG_DYNAMIC_FTRACE
- _count_relocs++; /* add one for ftrace_caller */
-#endif
- return _count_relocs;
-}
-
-static int relacmp(const void *_x, const void *_y)
-{
- const Elf32_Rela *x, *y;
-
- y = (Elf32_Rela *)_x;
- x = (Elf32_Rela *)_y;
-
- /* Compare the entire r_info (as opposed to ELF32_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;
-}
-
-static void relaswap(void *_x, void *_y, int size)
-{
- uint32_t *x, *y, tmp;
- int i;
-
- y = (uint32_t *)_x;
- x = (uint32_t *)_y;
-
- for (i = 0; i < sizeof(Elf32_Rela) / sizeof(uint32_t); i++) {
- tmp = x[i];
- x[i] = y[i];
- y[i] = tmp;
- }
-}
-
-/* Get the potential trampolines size required of the init and
- non-init sections */
-static unsigned long get_plt_size(const Elf32_Ehdr *hdr,
- const Elf32_Shdr *sechdrs,
- const char *secstrings,
- int is_init)
-{
- unsigned long ret = 0;
- unsigned i;
-
- /* Everything marked ALLOC (this includes the exported
- symbols) */
- for (i = 1; i < hdr->e_shnum; i++) {
- /* If it's called *.init*, and we're not init, we're
- not interested */
- if ((strstr(secstrings + sechdrs[i].sh_name, ".init") != 0)
- != is_init)
- continue;
-
- /* We don't want to look at debug sections. */
- if (strstr(secstrings + sechdrs[i].sh_name, ".debug") != 0)
- continue;
-
- if (sechdrs[i].sh_type == SHT_RELA) {
- DEBUGP("Found relocations in section %u\n", i);
- DEBUGP("Ptr: %p. Number: %u\n",
- (void *)hdr + sechdrs[i].sh_offset,
- sechdrs[i].sh_size / sizeof(Elf32_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 *)hdr + sechdrs[i].sh_offset,
- sechdrs[i].sh_size / sizeof(Elf32_Rela),
- sizeof(Elf32_Rela), relacmp, relaswap);
-
- ret += count_relocs((void *)hdr
- + sechdrs[i].sh_offset,
- sechdrs[i].sh_size
- / sizeof(Elf32_Rela))
- * sizeof(struct ppc_plt_entry);
- }
- }
-
- return ret;
-}
-
-int module_frob_arch_sections(Elf32_Ehdr *hdr,
- Elf32_Shdr *sechdrs,
- char *secstrings,
- struct module *me)
-{
- unsigned int i;
-
- /* Find .plt and .init.plt sections */
- for (i = 0; i < hdr->e_shnum; i++) {
- if (strcmp(secstrings + sechdrs[i].sh_name, ".init.plt") == 0)
- me->arch.init_plt_section = i;
- else if (strcmp(secstrings + sechdrs[i].sh_name, ".plt") == 0)
- me->arch.core_plt_section = i;
- }
- if (!me->arch.core_plt_section || !me->arch.init_plt_section) {
- printk("Module doesn't contain .plt or .init.plt sections.\n");
- return -ENOEXEC;
- }
-
- /* Override their sizes */
- sechdrs[me->arch.core_plt_section].sh_size
- = get_plt_size(hdr, sechdrs, secstrings, 0);
- sechdrs[me->arch.init_plt_section].sh_size
- = get_plt_size(hdr, sechdrs, secstrings, 1);
- return 0;
-}
-
-static inline int entry_matches(struct ppc_plt_entry *entry, Elf32_Addr val)
-{
- if (entry->jump[0] == 0x3d800000 + ((val + 0x8000) >> 16)
- && entry->jump[1] == 0x398c0000 + (val & 0xffff))
- return 1;
- return 0;
-}
-
-/* Set up a trampoline in the PLT to bounce us to the distant function */
-static uint32_t do_plt_call(void *location,
- Elf32_Addr val,
- Elf32_Shdr *sechdrs,
- struct module *mod)
-{
- struct ppc_plt_entry *entry;
-
- DEBUGP("Doing plt for call to 0x%x at 0x%x\n", val, (unsigned int)location);
- /* Init, or core PLT? */
- if (location >= mod->module_core
- && location < mod->module_core + mod->core_size)
- entry = (void *)sechdrs[mod->arch.core_plt_section].sh_addr;
- else
- entry = (void *)sechdrs[mod->arch.init_plt_section].sh_addr;
-
- /* Find this entry, or if that fails, the next avail. entry */
- while (entry->jump[0]) {
- if (entry_matches(entry, val)) return (uint32_t)entry;
- entry++;
- }
-
- entry->jump[0] = 0x3d800000+((val+0x8000)>>16); /* lis r12,sym@ha */
- entry->jump[1] = 0x398c0000 + (val&0xffff); /* addi r12,r12,sym@l*/
- entry->jump[2] = 0x7d8903a6; /* mtctr r12 */
- entry->jump[3] = 0x4e800420; /* bctr */
-
- DEBUGP("Initialized plt for 0x%x at %p\n", val, entry);
- return (uint32_t)entry;
-}
-
-int apply_relocate_add(Elf32_Shdr *sechdrs,
- const char *strtab,
- unsigned int symindex,
- unsigned int relsec,
- struct module *module)
-{
- unsigned int i;
- Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
- Elf32_Sym *sym;
- uint32_t *location;
- uint32_t value;
-
- DEBUGP("Applying ADD 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 */
- location = (void *)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. */
- sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
- + ELF32_R_SYM(rela[i].r_info);
- /* `Everything is relative'. */
- value = sym->st_value + rela[i].r_addend;
-
- switch (ELF32_R_TYPE(rela[i].r_info)) {
- case R_PPC_ADDR32:
- /* Simply set it */
- *(uint32_t *)location = value;
- break;
-
- case R_PPC_ADDR16_LO:
- /* Low half of the symbol */
- *(uint16_t *)location = value;
- break;
-
- case R_PPC_ADDR16_HI:
- /* Higher half of the symbol */
- *(uint16_t *)location = (value >> 16);
- break;
-
- case R_PPC_ADDR16_HA:
- /* Sign-adjusted lower 16 bits: PPC ELF ABI says:
- (((x >> 16) + ((x & 0x8000) ? 1 : 0))) & 0xFFFF.
- This is the same, only sane.
- */
- *(uint16_t *)location = (value + 0x8000) >> 16;
- break;
-
- case R_PPC_REL24:
- if ((int)(value - (uint32_t)location) < -0x02000000
- || (int)(value - (uint32_t)location) >= 0x02000000)
- value = do_plt_call(location, value,
- sechdrs, module);
-
- /* Only replace bits 2 through 26 */
- DEBUGP("REL24 value = %08X. location = %08X\n",
- value, (uint32_t)location);
- DEBUGP("Location before: %08X.\n",
- *(uint32_t *)location);
- *(uint32_t *)location
- = (*(uint32_t *)location & ~0x03fffffc)
- | ((value - (uint32_t)location)
- & 0x03fffffc);
- DEBUGP("Location after: %08X.\n",
- *(uint32_t *)location);
- DEBUGP("ie. jump to %08X+%08X = %08X\n",
- *(uint32_t *)location & 0x03fffffc,
- (uint32_t)location,
- (*(uint32_t *)location & 0x03fffffc)
- + (uint32_t)location);
- break;
-
- case R_PPC_REL32:
- /* 32-bit relative jump. */
- *(uint32_t *)location = value - (uint32_t)location;
- break;
-
- default:
- printk("%s: unknown ADD relocation: %u\n",
- module->name,
- ELF32_R_TYPE(rela[i].r_info));
- return -ENOEXEC;
- }
- }
-#ifdef CONFIG_DYNAMIC_FTRACE
- module->arch.tramp =
- do_plt_call(module->module_core,
- (unsigned long)ftrace_caller,
- sechdrs, module);
-#endif
- return 0;
-}
generated by cgit (git 2.34.1) at 2025-01-25 20:44:03 +0000