Commit | Line | Data |
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a11f4f0a BO |
1 | #include <linux/module.h> |
2 | #include <linux/init.h> | |
3 | #include <linux/seq_file.h> | |
4 | #include <linux/fs.h> | |
5 | #include <linux/mm.h> | |
6 | #include <linux/proc_fs.h> | |
7 | #include <linux/slab.h> | |
8 | #include <xen/interface/platform.h> | |
9 | #include <asm/xen/hypercall.h> | |
10 | #include <xen/xen-ops.h> | |
11 | #include "xenfs.h" | |
12 | ||
13 | ||
14 | #define XEN_KSYM_NAME_LEN 127 /* Hypervisor may have different name length */ | |
15 | ||
16 | struct xensyms { | |
17 | struct xen_platform_op op; | |
18 | char *name; | |
19 | uint32_t namelen; | |
20 | }; | |
21 | ||
22 | /* Grab next output page from the hypervisor */ | |
23 | static int xensyms_next_sym(struct xensyms *xs) | |
24 | { | |
25 | int ret; | |
26 | struct xenpf_symdata *symdata = &xs->op.u.symdata; | |
27 | uint64_t symnum; | |
28 | ||
29 | memset(xs->name, 0, xs->namelen); | |
30 | symdata->namelen = xs->namelen; | |
31 | ||
32 | symnum = symdata->symnum; | |
33 | ||
34 | ret = HYPERVISOR_dom0_op(&xs->op); | |
35 | if (ret < 0) | |
36 | return ret; | |
37 | ||
38 | /* | |
39 | * If hypervisor's symbol didn't fit into the buffer then allocate | |
40 | * a larger buffer and try again. | |
41 | */ | |
42 | if (unlikely(symdata->namelen > xs->namelen)) { | |
43 | kfree(xs->name); | |
44 | ||
45 | xs->namelen = symdata->namelen; | |
46 | xs->name = kzalloc(xs->namelen, GFP_KERNEL); | |
47 | if (!xs->name) | |
48 | return -ENOMEM; | |
49 | ||
50 | set_xen_guest_handle(symdata->name, xs->name); | |
51 | symdata->symnum--; /* Rewind */ | |
52 | ||
53 | ret = HYPERVISOR_dom0_op(&xs->op); | |
54 | if (ret < 0) | |
55 | return ret; | |
56 | } | |
57 | ||
58 | if (symdata->symnum == symnum) | |
59 | /* End of symbols */ | |
60 | return 1; | |
61 | ||
62 | return 0; | |
63 | } | |
64 | ||
65 | static void *xensyms_start(struct seq_file *m, loff_t *pos) | |
66 | { | |
67 | struct xensyms *xs = (struct xensyms *)m->private; | |
68 | ||
69 | xs->op.u.symdata.symnum = *pos; | |
70 | ||
71 | if (xensyms_next_sym(xs)) | |
72 | return NULL; | |
73 | ||
74 | return m->private; | |
75 | } | |
76 | ||
77 | static void *xensyms_next(struct seq_file *m, void *p, loff_t *pos) | |
78 | { | |
79 | struct xensyms *xs = (struct xensyms *)m->private; | |
80 | ||
81 | xs->op.u.symdata.symnum = ++(*pos); | |
82 | ||
83 | if (xensyms_next_sym(xs)) | |
84 | return NULL; | |
85 | ||
86 | return p; | |
87 | } | |
88 | ||
89 | static int xensyms_show(struct seq_file *m, void *p) | |
90 | { | |
91 | struct xensyms *xs = (struct xensyms *)m->private; | |
92 | struct xenpf_symdata *symdata = &xs->op.u.symdata; | |
93 | ||
94 | seq_printf(m, "%016llx %c %s\n", symdata->address, | |
95 | symdata->type, xs->name); | |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
100 | static void xensyms_stop(struct seq_file *m, void *p) | |
101 | { | |
102 | } | |
103 | ||
104 | static const struct seq_operations xensyms_seq_ops = { | |
105 | .start = xensyms_start, | |
106 | .next = xensyms_next, | |
107 | .show = xensyms_show, | |
108 | .stop = xensyms_stop, | |
109 | }; | |
110 | ||
111 | static int xensyms_open(struct inode *inode, struct file *file) | |
112 | { | |
113 | struct seq_file *m; | |
114 | struct xensyms *xs; | |
115 | int ret; | |
116 | ||
117 | ret = seq_open_private(file, &xensyms_seq_ops, | |
118 | sizeof(struct xensyms)); | |
119 | if (ret) | |
120 | return ret; | |
121 | ||
122 | m = file->private_data; | |
123 | xs = (struct xensyms *)m->private; | |
124 | ||
125 | xs->namelen = XEN_KSYM_NAME_LEN + 1; | |
126 | xs->name = kzalloc(xs->namelen, GFP_KERNEL); | |
127 | if (!xs->name) { | |
128 | seq_release_private(inode, file); | |
129 | return -ENOMEM; | |
130 | } | |
131 | set_xen_guest_handle(xs->op.u.symdata.name, xs->name); | |
132 | xs->op.cmd = XENPF_get_symbol; | |
133 | xs->op.u.symdata.namelen = xs->namelen; | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
138 | static int xensyms_release(struct inode *inode, struct file *file) | |
139 | { | |
140 | struct seq_file *m = file->private_data; | |
141 | struct xensyms *xs = (struct xensyms *)m->private; | |
142 | ||
143 | kfree(xs->name); | |
144 | return seq_release_private(inode, file); | |
145 | } | |
146 | ||
147 | const struct file_operations xensyms_ops = { | |
148 | .open = xensyms_open, | |
149 | .read = seq_read, | |
150 | .llseek = seq_lseek, | |
151 | .release = xensyms_release | |
152 | }; |