1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
4 #include <linux/kernel.h>
6 #include <linux/sched.h>
8 #include <linux/init.h>
9 #include <linux/binfmts.h>
10 #include <linux/elf.h>
11 #include <linux/vmalloc.h>
12 #include <linux/unistd.h>
13 #include <linux/uaccess.h>
16 #include <asm/cacheflush.h>
18 static struct page *vdso_page;
20 static int __init init_vdso(void)
22 struct csky_vdso *vdso;
25 vdso_page = alloc_page(GFP_KERNEL);
27 panic("Cannot allocate vdso");
29 vdso = vmap(&vdso_page, 1, 0, PAGE_KERNEL);
31 panic("Cannot map vdso");
35 err = setup_vdso_page(vdso->rt_signal_retcode);
37 panic("Cannot set signal return code, err: %x.", err);
39 dcache_wb_range((unsigned long)vdso, (unsigned long)vdso + 16);
45 subsys_initcall(init_vdso);
47 int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
51 struct mm_struct *mm = current->mm;
53 down_write(&mm->mmap_sem);
55 addr = get_unmapped_area(NULL, STACK_TOP, PAGE_SIZE, 0, 0);
56 if (IS_ERR_VALUE(addr)) {
61 ret = install_special_mapping(
65 VM_READ|VM_EXEC|VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
70 mm->context.vdso = (void *)addr;
73 up_write(&mm->mmap_sem);
77 const char *arch_vma_name(struct vm_area_struct *vma)
79 if (vma->vm_mm == NULL)
82 if (vma->vm_start == (long)vma->vm_mm->context.vdso)