diff options
Diffstat (limited to 'arch/s390x/kernel/exec32.c')
| -rw-r--r-- | arch/s390x/kernel/exec32.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/arch/s390x/kernel/exec32.c b/arch/s390x/kernel/exec32.c new file mode 100644 index 000000000..3e6f44558 --- /dev/null +++ b/arch/s390x/kernel/exec32.c @@ -0,0 +1,85 @@ +/* + * 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) + * + * Seperated 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/highmem.h> +#include <linux/spinlock.h> +#define __NO_VERSION__ +#include <linux/module.h> + +#include <asm/uaccess.h> +#include <asm/pgalloc.h> +#include <asm/mmu_context.h> + +#ifdef CONFIG_KMOD +#include <linux/kmod.h> +#endif + + +extern void put_dirty_page(struct task_struct * tsk, struct page *page, unsigned long address); + +#undef STACK_TOP +#define STACK_TOP TASK31_SIZE + +int setup_arg_pages32(struct linux_binprm *bprm) +{ + unsigned long stack_base; + struct vm_area_struct *mpnt; + int i; + + stack_base = STACK_TOP - MAX_ARG_PAGES*PAGE_SIZE; + + 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; + + down(¤t->mm->mmap_sem); + { + mpnt->vm_mm = current->mm; + mpnt->vm_start = PAGE_MASK & (unsigned long) bprm->p; + mpnt->vm_end = STACK_TOP; + mpnt->vm_page_prot = PAGE_COPY; + mpnt->vm_flags = VM_STACK_FLAGS; + mpnt->vm_ops = NULL; + mpnt->vm_pgoff = 0; + mpnt->vm_file = NULL; + mpnt->vm_private_data = (void *) 0; + insert_vm_struct(current->mm, mpnt); + current->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; + current->mm->rss++; + put_dirty_page(current,page,stack_base); + } + stack_base += PAGE_SIZE; + } + up(¤t->mm->mmap_sem); + + return 0; +} + |