[PATCH] s390: module loader.

1 files changed, 174 insertions, 0 deletions

diff --git a/arch/s390/kernel/module.c b/arch/s390/kernel/module.c
new file mode 100644
index 000000000000..314160ffb68f
--- /dev/null
+++ b/arch/s390/kernel/module.c
@@ -0,0 +1,174 @@
+/*
+ *  arch/s390x/kernel/module.c - Kernel module help for s390x.
+ *
+ *  S390 version
+ *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ *    Author(s): Arnd Bergmann (arndb@de.ibm.com)
+ *		 Martin Schwidefsky (schwidefsky@de.ibm.com)
+ *
+ *  based on i386 version
+ *    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
+
+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. */
+}
+
+/* s390/s390x needs additional memory for GOT/PLT sections. */
+long module_core_size(const Elf32_Ehdr *hdr,
+		      const Elf32_Shdr *sechdrs,
+		      const char *secstrings,
+		      struct module *module)
+{
+	// FIXME: add space needed for GOT/PLT
+	return module->core_size;
+}
+
+long module_init_size(const Elf32_Ehdr *hdr,
+		      const Elf32_Shdr *sechdrs,
+		      const char *secstrings,
+		      struct module *module)
+{
+	return module->init_size;
+}
+
+
+
+int apply_relocate(Elf_Shdr *sechdrs,
+		   const char *strtab,
+		   unsigned int symindex,
+		   unsigned int relsec,
+		   struct module *me)
+{
+	unsigned int i;
+	ElfW(Rel) *rel = (void *)sechdrs[relsec].sh_offset;
+	ElfW(Sym) *sym;
+	ElfW(Addr) *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 = (ElfW(Sym) *)sechdrs[symindex].sh_offset
+			+ ELFW(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 (ELF_R_TYPE(rel[i].r_info)) {
+		case R_390_8:		/* Direct 8 bit.   */
+			*(u8*) location += sym->st_value;
+			break;
+		case R_390_12:		/* Direct 12 bit.  */
+			*(u16*) location = (*(u16*) location & 0xf000) | 
+				(sym->st_value & 0xfff);
+			break;
+		case R_390_16:		/* Direct 16 bit.  */
+			*(u16*) location += sym->st_value;
+			break;
+		case R_390_32:		/* Direct 32 bit.  */
+			*(u32*) location += sym->st_value;
+			break;
+		case R_390_PC16:	/* PC relative 16 bit.  */
+			*(u16*) location += sym->st_value
+					    - (unsigned long )location;
+
+		case R_390_PC16DBL:	/* PC relative 16 bit shifted by 1.  */
+			*(u16*) location += (sym->st_value
+					     - (unsigned long )location) >> 1;
+		case R_390_PC32:	/* PC relative 32 bit.  */
+			*(u32*) location += sym->st_value
+					    - (unsigned long )location;
+			break;
+		case R_390_GOT12:	/* 12 bit GOT offset.  */
+		case R_390_GOT16:	/* 16 bit GOT offset.  */
+		case R_390_GOT32:	/* 32 bit GOT offset.  */
+			// FIXME: TODO
+			break;
+
+		case R_390_PLT16DBL:	/* 16 bit PC rel. PLT shifted by 1.  */
+		case R_390_PLT32:	/* 32 bit PC relative PLT address.  */
+			// FIXME: TODO
+			break;
+		case R_390_GLOB_DAT:	/* Create GOT entry.  */
+		case R_390_JMP_SLOT:	/* Create PLT entry.  */
+			*location = sym->st_value;
+			break;
+		case R_390_RELATIVE:	/* Adjust by program base.  */
+			// FIXME: TODO
+			break;
+		case R_390_GOTOFF:	/* 32 bit offset to GOT.  */
+			// FIXME: TODO
+			break;
+		case R_390_GOTPC:	/* 32 bit PC relative offset to GOT. */
+			// FIXME: TODO
+			break;
+		default:
+			printk(KERN_ERR "module %s: Unknown relocation: %lu\n",
+			       me->name,
+			       (unsigned long)ELF_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;
+}