diff options
author | Paul Mackerras <paulus@samba.org> | 2006-03-27 19:28:58 +1100 |
---|---|---|
committer | Paul Mackerras <paulus@samba.org> | 2006-03-27 19:28:58 +1100 |
commit | ed981856ca8af30912fd61a6a4ac8d30a453a5ec (patch) | |
tree | 7297090fc4c5445422be9a1f86e95c2e899881b1 /arch/ppc/kernel | |
parent | 45320bcbabfa9149f43a5beb4b9a4f108dd98929 (diff) |
powerpc: Move module.c over to arch/powerpc
... and rename it to module_32.c since it is the 32-bit version.
The 32-bit and 64-bit ABIs are sufficiently different that having
a merged version isn't really practical.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/ppc/kernel')
-rw-r--r-- | arch/ppc/kernel/Makefile | 3 | ||||
-rw-r--r-- | arch/ppc/kernel/module.c | 320 |
2 files changed, 1 insertions, 322 deletions
diff --git a/arch/ppc/kernel/Makefile b/arch/ppc/kernel/Makefile index 8ac1dd958415..e55d7ee17957 100644 --- a/arch/ppc/kernel/Makefile +++ b/arch/ppc/kernel/Makefile @@ -13,7 +13,7 @@ extra-y += vmlinux.lds obj-y := entry.o traps.o time.o misc.o \ setup.o \ ppc_htab.o -obj-$(CONFIG_MODULES) += module.o ppc_ksyms.o +obj-$(CONFIG_MODULES) += ppc_ksyms.o obj-$(CONFIG_NOT_COHERENT_CACHE) += dma-mapping.o obj-$(CONFIG_PCI) += pci.o obj-$(CONFIG_RAPIDIO) += rio.o @@ -31,7 +31,6 @@ endif # These are here while we do the architecture merge else -obj-$(CONFIG_MODULES) += module.o obj-$(CONFIG_NOT_COHERENT_CACHE) += dma-mapping.o obj-$(CONFIG_KGDB) += ppc-stub.o ifndef CONFIG_E200 diff --git a/arch/ppc/kernel/module.c b/arch/ppc/kernel/module.c deleted file mode 100644 index 92f4e5f64f02..000000000000 --- a/arch/ppc/kernel/module.c +++ /dev/null @@ -1,320 +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/cache.h> - -#if 0 -#define DEBUGP printk -#else -#define DEBUGP(fmt , ...) -#endif - -LIST_HEAD(module_bug_list); - -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. */ -} - -/* Count how many different relocations (different symbol, different - addend) */ -static unsigned int count_relocs(const Elf32_Rela *rela, unsigned int num) -{ - unsigned int i, j, ret = 0; - - /* Sure, this is order(n^2), but it's usually short, and not - time critical */ - for (i = 0; i < num; i++) { - for (j = 0; j < i; j++) { - /* If this addend appeared before, it's - already been counted */ - if (ELF32_R_SYM(rela[i].r_info) - == ELF32_R_SYM(rela[j].r_info) - && rela[i].r_addend == rela[j].r_addend) - break; - } - if (j == i) ret++; - } - return ret; -} - -/* 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)); - 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; -} - -int apply_relocate(Elf32_Shdr *sechdrs, - const char *strtab, - unsigned int symindex, - unsigned int relsec, - struct module *module) -{ - printk(KERN_ERR "%s: Non-ADD RELOCATION unsupported\n", - module->name); - return -ENOEXEC; -} - -static inline int entry_matches(struct ppc_plt_entry *entry, Elf32_Addr val) -{ - if (entry->jump[0] == 0x3d600000 + ((val + 0x8000) >> 16) - && entry->jump[1] == 0x396b0000 + (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++; - } - - /* Stolen from Paul Mackerras as well... */ - entry->jump[0] = 0x3d600000+((val+0x8000)>>16); /* lis r11,sym@ha */ - entry->jump[1] = 0x396b0000 + (val&0xffff); /* addi r11,r11,sym@l*/ - entry->jump[2] = 0x7d6903a6; /* mtctr r11 */ - 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_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; - } - } - return 0; -} - -int module_finalize(const Elf_Ehdr *hdr, - const Elf_Shdr *sechdrs, - struct module *me) -{ - char *secstrings; - unsigned int i; - - me->arch.bug_table = NULL; - me->arch.num_bugs = 0; - - /* Find the __bug_table section, if present */ - secstrings = (char *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; - for (i = 1; i < hdr->e_shnum; i++) { - if (strcmp(secstrings+sechdrs[i].sh_name, "__bug_table")) - continue; - me->arch.bug_table = (void *) sechdrs[i].sh_addr; - me->arch.num_bugs = sechdrs[i].sh_size / sizeof(struct bug_entry); - break; - } - - /* - * Strictly speaking this should have a spinlock to protect against - * traversals, but since we only traverse on BUG()s, a spinlock - * could potentially lead to deadlock and thus be counter-productive. - */ - list_add(&me->arch.bug_list, &module_bug_list); - - return 0; -} - -void module_arch_cleanup(struct module *mod) -{ - list_del(&mod->arch.bug_list); -} - -struct bug_entry *module_find_bug(unsigned long bugaddr) -{ - struct mod_arch_specific *mod; - unsigned int i; - struct bug_entry *bug; - - 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; -} |