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dd3ef10e GR |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. | |
3 | ||
4 | #include <linux/kernel.h> | |
5 | #include <linux/err.h> | |
6 | #include <linux/sched.h> | |
7 | #include <linux/mm.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> | |
14 | ||
15 | #include <asm/vdso.h> | |
16 | #include <asm/cacheflush.h> | |
17 | ||
18 | static struct page *vdso_page; | |
19 | ||
20 | static int __init init_vdso(void) | |
21 | { | |
22 | struct csky_vdso *vdso; | |
23 | int err = 0; | |
24 | ||
25 | vdso_page = alloc_page(GFP_KERNEL); | |
26 | if (!vdso_page) | |
27 | panic("Cannot allocate vdso"); | |
28 | ||
29 | vdso = vmap(&vdso_page, 1, 0, PAGE_KERNEL); | |
30 | if (!vdso) | |
31 | panic("Cannot map vdso"); | |
32 | ||
33 | clear_page(vdso); | |
34 | ||
35 | err = setup_vdso_page(vdso->rt_signal_retcode); | |
36 | if (err) | |
37 | panic("Cannot set signal return code, err: %x.", err); | |
38 | ||
39 | dcache_wb_range((unsigned long)vdso, (unsigned long)vdso + 16); | |
40 | ||
41 | vunmap(vdso); | |
42 | ||
43 | return 0; | |
44 | } | |
45 | subsys_initcall(init_vdso); | |
46 | ||
47 | int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) | |
48 | { | |
49 | int ret; | |
50 | unsigned long addr; | |
51 | struct mm_struct *mm = current->mm; | |
52 | ||
d8ed45c5 | 53 | mmap_write_lock(mm); |
dd3ef10e GR |
54 | |
55 | addr = get_unmapped_area(NULL, STACK_TOP, PAGE_SIZE, 0, 0); | |
56 | if (IS_ERR_VALUE(addr)) { | |
57 | ret = addr; | |
58 | goto up_fail; | |
59 | } | |
60 | ||
61 | ret = install_special_mapping( | |
62 | mm, | |
63 | addr, | |
64 | PAGE_SIZE, | |
65 | VM_READ|VM_EXEC|VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC, | |
66 | &vdso_page); | |
67 | if (ret) | |
68 | goto up_fail; | |
69 | ||
70 | mm->context.vdso = (void *)addr; | |
71 | ||
72 | up_fail: | |
d8ed45c5 | 73 | mmap_write_unlock(mm); |
dd3ef10e GR |
74 | return ret; |
75 | } | |
76 | ||
77 | const char *arch_vma_name(struct vm_area_struct *vma) | |
78 | { | |
79 | if (vma->vm_mm == NULL) | |
80 | return NULL; | |
81 | ||
82 | if (vma->vm_start == (long)vma->vm_mm->context.vdso) | |
83 | return "[vdso]"; | |
84 | else | |
85 | return NULL; | |
86 | } |