2 * Support for 32-bit Linux for S390 ELF binaries.
4 * Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
5 * Author(s): Gerhard Tonn (ton@de.ibm.com)
7 * Separated from binfmt_elf32.c to reduce exports for module enablement.
11 #include <linux/config.h>
12 #include <linux/slab.h>
13 #include <linux/file.h>
14 #include <linux/mman.h>
15 #include <linux/a.out.h>
16 #include <linux/stat.h>
17 #include <linux/fcntl.h>
18 #include <linux/smp_lock.h>
19 #include <linux/init.h>
20 #include <linux/pagemap.h>
22 #include <linux/highmem.h>
23 #include <linux/spinlock.h>
24 #include <linux/binfmts.h>
25 #include <linux/module.h>
26 #include <linux/security.h>
28 #include <asm/uaccess.h>
29 #include <asm/pgalloc.h>
30 #include <asm/mmu_context.h>
33 #include <linux/kmod.h>
37 int setup_arg_pages32(struct linux_binprm *bprm, int executable_stack)
39 unsigned long stack_base, grow;
40 struct vm_area_struct *mpnt;
41 struct mm_struct *mm = current->mm;
44 stack_base = STACK_TOP - MAX_ARG_PAGES*PAGE_SIZE;
45 mm->arg_start = bprm->p + stack_base;
47 bprm->p += stack_base;
49 bprm->loader += stack_base;
50 bprm->exec += stack_base;
52 mpnt = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);
56 grow = (STACK_TOP - (PAGE_MASK & (unsigned long) bprm->p))
58 if (security_vm_enough_memory(grow) ||
59 !vx_vmpages_avail(mm, grow)) {
60 kmem_cache_free(vm_area_cachep, mpnt);
64 memset(mpnt, 0, sizeof(*mpnt));
66 down_write(&mm->mmap_sem);
69 mpnt->vm_start = PAGE_MASK & (unsigned long) bprm->p;
70 mpnt->vm_end = STACK_TOP;
71 /* executable stack setting would be applied here */
72 mpnt->vm_page_prot = PAGE_COPY;
73 mpnt->vm_flags = VM_STACK_FLAGS;
74 insert_vm_struct(mm, mpnt);
75 // mm->stack_vm = mm->total_vm = vma_pages(mpnt);
76 vx_vmpages_sub(mm, mm->total_vm - vma_pages(mpnt));
77 mm->stack_vm = mm->total_vm;
80 for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
81 struct page *page = bprm->page[i];
84 install_arg_page(mpnt, page, stack_base);
86 stack_base += PAGE_SIZE;
88 up_write(&mm->mmap_sem);
93 EXPORT_SYMBOL(setup_arg_pages32);