/* * Support for 32-bit Linux for S390 ELF binaries. * * Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation * Author(s): Gerhard Tonn (ton@de.ibm.com) * * Separated from binfmt_elf32.c to reduce exports for module enablement. * */#include <linux/config.h>#include <linux/slab.h>#include <linux/file.h>#include <linux/mman.h>#include <linux/a.out.h>#include <linux/stat.h>#include <linux/fcntl.h>#include <linux/smp_lock.h>#include <linux/init.h>#include <linux/pagemap.h>#include <linux/mm.h>#include <linux/highmem.h>#include <linux/spinlock.h>#include <linux/binfmts.h>#include <linux/module.h>#include <linux/security.h>#include <asm/uaccess.h>#include <asm/pgalloc.h>#include <asm/mmu_context.h>#ifdef CONFIG_KMOD#include <linux/kmod.h>#endifint setup_arg_pages32(struct linux_binprm *bprm, int executable_stack){	unsigned long stack_base;	struct vm_area_struct *mpnt;	struct mm_struct *mm = current->mm;	int i;	stack_base = STACK_TOP - MAX_ARG_PAGES*PAGE_SIZE;	mm->arg_start = bprm->p + stack_base;	bprm->p += stack_base;	if (bprm->loader)		bprm->loader += stack_base;	bprm->exec += stack_base;	mpnt = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);	if (!mpnt) 		return -ENOMEM; 		if (security_vm_enough_memory((STACK_TOP - (PAGE_MASK & (unsigned long) bprm->p))>>PAGE_SHIFT)) {		kmem_cache_free(vm_area_cachep, mpnt);		return -ENOMEM;	}	memset(mpnt, 0, sizeof(*mpnt));	down_write(&mm->mmap_sem);	{		mpnt->vm_mm = mm;		mpnt->vm_start = PAGE_MASK & (unsigned long) bprm->p;		mpnt->vm_end = STACK_TOP;		/* executable stack setting would be applied here */		mpnt->vm_page_prot = PAGE_COPY;		mpnt->vm_flags = VM_STACK_FLAGS;		insert_vm_struct(mm, mpnt);		mm->total_vm = (mpnt->vm_end - mpnt->vm_start) >> PAGE_SHIFT;	} 	for (i = 0 ; i < MAX_ARG_PAGES ; i++) {		struct page *page = bprm->page[i];		if (page) {			bprm->page[i] = NULL;			install_arg_page(mpnt, page, stack_base);		}		stack_base += PAGE_SIZE;	}	up_write(&mm->mmap_sem);		return 0;}EXPORT_SYMBOL(setup_arg_pages32);