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Subject[PATCH] Module loader against 2.5.46: 3/9
Date
Linus, please apply.  Make x86 compile, and their modules work.

Rusty.

Name: New Module Loader Base: x86 support
Author: Rusty Russell
Status: Tested on 2.5.45
Depends: Module/module.patch.gz

D: This patch provides basic x86 support for modules.

diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal .9540-2.5.45-module-i386.pre/arch/i386/kernel/Makefile .9540-2.5.45-module-i386/arch/i386/kernel/Makefile
--- .9540-2.5.45-module-i386.pre/arch/i386/kernel/Makefile 2002-10-19 17:47:49.000000000 +1000
+++ .9540-2.5.45-module-i386/arch/i386/kernel/Makefile 2002-11-01 11:15:05.000000000 +1100
@@ -29,6 +29,7 @@ obj-$(CONFIG_SOFTWARE_SUSPEND) += suspen
obj-$(CONFIG_X86_NUMAQ) += numaq.o
obj-$(CONFIG_PROFILING) += profile.o
obj-$(CONFIG_EDD) += edd.o
+obj-$(CONFIG_MODULES) += module.o

EXTRA_AFLAGS := -traditional

diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal .9540-2.5.45-module-i386.pre/arch/i386/kernel/entry.S .9540-2.5.45-module-i386/arch/i386/kernel/entry.S
--- .9540-2.5.45-module-i386.pre/arch/i386/kernel/entry.S 2002-10-31 12:36:19.000000000 +1100
+++ .9540-2.5.45-module-i386/arch/i386/kernel/entry.S 2002-11-01 11:15:05.000000000 +1100
@@ -610,10 +610,10 @@ ENTRY(sys_call_table)
.long sys_adjtimex
.long sys_mprotect /* 125 */
.long sys_sigprocmask
- .long sys_create_module
+ .long sys_ni_syscall /* old "create_module" */
.long sys_init_module
.long sys_delete_module
- .long sys_get_kernel_syms /* 130 */
+ .long sys_ni_syscall /* 130: old "get_kernel_syms" */
.long sys_quotactl
.long sys_getpgid
.long sys_fchdir
@@ -650,7 +650,7 @@ ENTRY(sys_call_table)
.long sys_setresuid16
.long sys_getresuid16 /* 165 */
.long sys_vm86
- .long sys_query_module
+ .long sys_ni_syscall /* Old sys_query_module */
.long sys_poll
.long sys_nfsservctl
.long sys_setresgid16 /* 170 */
diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal .9540-2.5.45-module-i386.pre/arch/i386/kernel/module.c .9540-2.5.45-module-i386/arch/i386/kernel/module.c
--- .9540-2.5.45-module-i386.pre/arch/i386/kernel/module.c 1970-01-01 10:00:00.000000000 +1000
+++ .9540-2.5.45-module-i386/arch/i386/kernel/module.c 2002-11-01 11:15:05.000000000 +1100
@@ -0,0 +1,130 @@
+/* Kernel module help for i386.
+ 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/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
+
+static void *alloc_and_zero(unsigned long size)
+{
+ void *ret;
+
+ /* We handle the zero case fine, unlike vmalloc */
+ if (size == 0)
+ return NULL;
+
+ ret = vmalloc(size);
+ if (!ret) ret = ERR_PTR(-ENOMEM);
+ else memset(ret, 0, size);
+
+ return ret;
+}
+
+/* Free memory returned from module_core_alloc/module_init_alloc */
+void module_free(struct module *mod, void *module_region)
+{
+ vfree(module_region);
+ /* FIXME: If module_region == mod->init_region, trim exception
+ table entries. */
+}
+
+void *module_core_alloc(const Elf32_Ehdr *hdr,
+ const Elf32_Shdr *sechdrs,
+ const char *secstrings,
+ struct module *module)
+{
+ return alloc_and_zero(module->core_size);
+}
+
+void *module_init_alloc(const Elf32_Ehdr *hdr,
+ const Elf32_Shdr *sechdrs,
+ const char *secstrings,
+ struct module *module)
+{
+ return alloc_and_zero(module->init_size);
+}
+
+int apply_relocate(Elf32_Shdr *sechdrs,
+ const char *strtab,
+ unsigned int symindex,
+ unsigned int relsec,
+ struct module *me)
+{
+ unsigned int i;
+ Elf32_Rel *rel = (void *)sechdrs[relsec].sh_offset;
+ Elf32_Sym *sym;
+ uint32_t *location;
+
+ DEBUGP("Applying relocate section %u to %u\n", relsec,
+ sechdrs[relsec].sh_info);
+ for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
+ /* This is where to make the change */
+ location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_offset
+ + rel[i].r_offset;
+ /* This is the symbol it is referring to */
+ sym = (Elf32_Sym *)sechdrs[symindex].sh_offset
+ + ELF32_R_SYM(rel[i].r_info);
+ if (!sym->st_value) {
+ printk(KERN_WARNING "%s: Unknown symbol %s\n",
+ me->name, strtab + sym->st_name);
+ return -ENOENT;
+ }
+
+ switch (ELF32_R_TYPE(rel[i].r_info)) {
+ case R_386_32:
+ /* We add the value into the location given */
+ *location += sym->st_value;
+ break;
+ case R_386_PC32:
+ /* Add the value, subtract its postition */
+ *location += sym->st_value - (uint32_t)location;
+ break;
+ default:
+ printk(KERN_ERR "module %s: Unknown relocation: %u\n",
+ me->name, ELF32_R_TYPE(rel[i].r_info));
+ return -ENOEXEC;
+ }
+ }
+ return 0;
+}
+
+int apply_relocate_add(Elf32_Shdr *sechdrs,
+ const char *strtab,
+ unsigned int symindex,
+ unsigned int relsec,
+ struct module *me)
+{
+ printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n",
+ me->name);
+ return -ENOEXEC;
+}
+
+int module_finalize(const Elf_Ehdr *hdr,
+ const Elf_Shdr *sechdrs,
+ struct module *me)
+{
+ return 0;
+}
diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal .9540-2.5.45-module-i386.pre/arch/i386/kernel/traps.c .9540-2.5.45-module-i386/arch/i386/kernel/traps.c
--- .9540-2.5.45-module-i386.pre/arch/i386/kernel/traps.c 2002-10-16 15:01:12.000000000 +1000
+++ .9540-2.5.45-module-i386/arch/i386/kernel/traps.c 2002-11-01 11:15:05.000000000 +1100
@@ -95,7 +95,8 @@ static int kstack_depth_to_print = 24;

#ifdef CONFIG_MODULES

-extern struct module kernel_module;
+/* FIXME: Accessed without a lock --RR */
+extern struct list_head modules;

static inline int kernel_text_address(unsigned long addr)
{
@@ -106,11 +107,11 @@ static inline int kernel_text_address(un
addr <= (unsigned long) &_etext)
return 1;

- for (mod = module_list; mod != &kernel_module; mod = mod->next) {
+ list_for_each_entry(mod, &modules, list) {
/* mod_bound tests for addr being inside the vmalloc'ed
* module area. Of course it'd be better to test only
* for the .text subset... */
- if (mod_bound(addr, 0, mod)) {
+ if (mod_bound((void *)addr, 0, mod)) {
retval = 1;
break;
}
diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal .9540-2.5.45-module-i386.pre/arch/i386/mm/extable.c .9540-2.5.45-module-i386/arch/i386/mm/extable.c
--- .9540-2.5.45-module-i386.pre/arch/i386/mm/extable.c 2001-09-18 06:16:30.000000000 +1000
+++ .9540-2.5.45-module-i386/arch/i386/mm/extable.c 2002-11-01 11:15:05.000000000 +1100
@@ -44,15 +44,17 @@ search_exception_table(unsigned long add
return ret;
#else
unsigned long flags;
- /* The kernel is the last "module" -- no need to treat it special. */
- struct module *mp;
+ struct list_head *i;

+ /* The kernel is the last "module" -- no need to treat it special. */
spin_lock_irqsave(&modlist_lock, flags);
- for (mp = module_list; mp != NULL; mp = mp->next) {
- if (mp->ex_table_start == NULL || !(mp->flags&(MOD_RUNNING|MOD_INITIALIZING)))
+ list_for_each(i, &extables) {
+ struct exception_table *ex
+ = list_entry(i, struct exception_table, list);
+ if (ex->num_entries == 0)
continue;
- ret = search_one_table(mp->ex_table_start,
- mp->ex_table_end - 1, addr);
+ ret = search_one_table(ex->entry,
+ ex->entry + ex->num_entries - 1, addr);
if (ret)
break;
}
diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal .9540-2.5.45-module-i386.pre/arch/i386/vmlinux.lds.S .9540-2.5.45-module-i386/arch/i386/vmlinux.lds.S
--- .9540-2.5.45-module-i386.pre/arch/i386/vmlinux.lds.S 2002-10-19 17:47:49.000000000 +1000
+++ .9540-2.5.45-module-i386/arch/i386/vmlinux.lds.S 2002-11-01 11:15:05.000000000 +1100
@@ -26,6 +26,7 @@ SECTIONS
__ex_table : { *(__ex_table) }
__stop___ex_table = .;

+ . = ALIGN(64);
__start___ksymtab = .; /* Kernel symbol table */
__ksymtab : { *(__ksymtab) }
__stop___ksymtab = .;
diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal .9540-2.5.45-module-i386.pre/include/asm-i386/module.h .9540-2.5.45-module-i386/include/asm-i386/module.h
--- .9540-2.5.45-module-i386.pre/include/asm-i386/module.h 2001-09-14 09:33:03.000000000 +1000
+++ .9540-2.5.45-module-i386/include/asm-i386/module.h 2002-11-01 11:15:05.000000000 +1100
@@ -1,12 +1,11 @@
#ifndef _ASM_I386_MODULE_H
#define _ASM_I386_MODULE_H
-/*
- * This file contains the i386 architecture specific module code.
- */
-
-#define module_map(x) vmalloc(x)
-#define module_unmap(x) vfree(x)
-#define module_arch_init(x) (0)
-#define arch_init_modules(x) do { } while (0)
+/* x86 is simple */
+struct mod_arch_specific
+{
+};

+#define Elf_Shdr Elf32_Shdr
+#define Elf_Sym Elf32_Sym
+#define Elf_Ehdr Elf32_Ehdr
#endif /* _ASM_I386_MODULE_H */
--
Anyone who quotes me in their sig is an idiot. -- Rusty Russell.
-
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