diff options
author | Paul Mundt <lethal@linux-sh.org> | 2007-02-08 23:20:44 +0100 |
---|---|---|
committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-02-09 18:25:47 +0100 |
commit | 2affc857efdf7dacace234b63d289d67260c95a6 (patch) | |
tree | e37d7158f9a0a477460913b06e94d48e5eacaf2c /arch/sh/kernel/vsyscall | |
parent | [PATCH] powerpc vDSO: use install_special_mapping (diff) | |
download | linux-2affc857efdf7dacace234b63d289d67260c95a6.tar.xz linux-2affc857efdf7dacace234b63d289d67260c95a6.zip |
[PATCH] SH vdso: use install_special_mapping()
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/sh/kernel/vsyscall')
-rw-r--r-- | arch/sh/kernel/vsyscall/vsyscall.c | 58 |
1 files changed, 9 insertions, 49 deletions
diff --git a/arch/sh/kernel/vsyscall/vsyscall.c b/arch/sh/kernel/vsyscall/vsyscall.c index deb46941f315..7b0f66f03319 100644 --- a/arch/sh/kernel/vsyscall/vsyscall.c +++ b/arch/sh/kernel/vsyscall/vsyscall.c @@ -37,11 +37,12 @@ __setup("vdso=", vdso_setup); * of the ELF DSO images included therein. */ extern const char vsyscall_trapa_start, vsyscall_trapa_end; -static void *syscall_page; +static struct page *syscall_pages[1]; int __init vsyscall_init(void) { - syscall_page = (void *)get_zeroed_page(GFP_ATOMIC); + void *syscall_page = (void *)get_zeroed_page(GFP_ATOMIC); + syscall_pages[0] = virt_to_page(syscall_page); /* * XXX: Map this page to a fixmap entry if we get around @@ -55,37 +56,10 @@ int __init vsyscall_init(void) return 0; } -static struct page *syscall_vma_nopage(struct vm_area_struct *vma, - unsigned long address, int *type) -{ - unsigned long offset = address - vma->vm_start; - struct page *page; - - if (address < vma->vm_start || address > vma->vm_end) - return NOPAGE_SIGBUS; - - page = virt_to_page(syscall_page + offset); - - get_page(page); - - return page; -} - -/* Prevent VMA merging */ -static void syscall_vma_close(struct vm_area_struct *vma) -{ -} - -static struct vm_operations_struct syscall_vm_ops = { - .nopage = syscall_vma_nopage, - .close = syscall_vma_close, -}; - /* Setup a VMA at program startup for the vsyscall page */ int arch_setup_additional_pages(struct linux_binprm *bprm, int executable_stack) { - struct vm_area_struct *vma; struct mm_struct *mm = current->mm; unsigned long addr; int ret; @@ -97,30 +71,16 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, goto up_fail; } - vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL); - if (!vma) { - ret = -ENOMEM; + ret = install_special_mapping(mm, addr, PAGE_SIZE, + VM_READ | VM_EXEC | + VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC | + VM_ALWAYSDUMP, + syscall_pages); + if (unlikely(ret)) goto up_fail; - } - - vma->vm_start = addr; - vma->vm_end = addr + PAGE_SIZE; - /* MAYWRITE to allow gdb to COW and set breakpoints */ - vma->vm_flags = VM_READ|VM_EXEC|VM_MAYREAD|VM_MAYEXEC|VM_MAYWRITE; - vma->vm_flags |= mm->def_flags; - vma->vm_page_prot = protection_map[vma->vm_flags & 7]; - vma->vm_ops = &syscall_vm_ops; - vma->vm_mm = mm; - - ret = insert_vm_struct(mm, vma); - if (unlikely(ret)) { - kmem_cache_free(vm_area_cachep, vma); - goto up_fail; - } current->mm->context.vdso = (void *)addr; - mm->total_vm++; up_fail: up_write(&mm->mmap_sem); return ret; |