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a11f4f0a BO |
1 | #include <linux/init.h> |
2 | #include <linux/seq_file.h> | |
3 | #include <linux/fs.h> | |
4 | #include <linux/mm.h> | |
5 | #include <linux/proc_fs.h> | |
6 | #include <linux/slab.h> | |
7 | #include <xen/interface/platform.h> | |
8 | #include <asm/xen/hypercall.h> | |
9 | #include <xen/xen-ops.h> | |
10 | #include "xenfs.h" | |
11 | ||
12 | ||
13 | #define XEN_KSYM_NAME_LEN 127 /* Hypervisor may have different name length */ | |
14 | ||
15 | struct xensyms { | |
16 | struct xen_platform_op op; | |
17 | char *name; | |
18 | uint32_t namelen; | |
19 | }; | |
20 | ||
21 | /* Grab next output page from the hypervisor */ | |
22 | static int xensyms_next_sym(struct xensyms *xs) | |
23 | { | |
24 | int ret; | |
25 | struct xenpf_symdata *symdata = &xs->op.u.symdata; | |
26 | uint64_t symnum; | |
27 | ||
28 | memset(xs->name, 0, xs->namelen); | |
29 | symdata->namelen = xs->namelen; | |
30 | ||
31 | symnum = symdata->symnum; | |
32 | ||
cfafae94 | 33 | ret = HYPERVISOR_platform_op(&xs->op); |
a11f4f0a BO |
34 | if (ret < 0) |
35 | return ret; | |
36 | ||
37 | /* | |
38 | * If hypervisor's symbol didn't fit into the buffer then allocate | |
39 | * a larger buffer and try again. | |
40 | */ | |
41 | if (unlikely(symdata->namelen > xs->namelen)) { | |
42 | kfree(xs->name); | |
43 | ||
44 | xs->namelen = symdata->namelen; | |
45 | xs->name = kzalloc(xs->namelen, GFP_KERNEL); | |
46 | if (!xs->name) | |
47 | return -ENOMEM; | |
48 | ||
49 | set_xen_guest_handle(symdata->name, xs->name); | |
50 | symdata->symnum--; /* Rewind */ | |
51 | ||
cfafae94 | 52 | ret = HYPERVISOR_platform_op(&xs->op); |
a11f4f0a BO |
53 | if (ret < 0) |
54 | return ret; | |
55 | } | |
56 | ||
57 | if (symdata->symnum == symnum) | |
58 | /* End of symbols */ | |
59 | return 1; | |
60 | ||
61 | return 0; | |
62 | } | |
63 | ||
64 | static void *xensyms_start(struct seq_file *m, loff_t *pos) | |
65 | { | |
66 | struct xensyms *xs = (struct xensyms *)m->private; | |
67 | ||
68 | xs->op.u.symdata.symnum = *pos; | |
69 | ||
70 | if (xensyms_next_sym(xs)) | |
71 | return NULL; | |
72 | ||
73 | return m->private; | |
74 | } | |
75 | ||
76 | static void *xensyms_next(struct seq_file *m, void *p, loff_t *pos) | |
77 | { | |
78 | struct xensyms *xs = (struct xensyms *)m->private; | |
79 | ||
80 | xs->op.u.symdata.symnum = ++(*pos); | |
81 | ||
82 | if (xensyms_next_sym(xs)) | |
83 | return NULL; | |
84 | ||
85 | return p; | |
86 | } | |
87 | ||
88 | static int xensyms_show(struct seq_file *m, void *p) | |
89 | { | |
90 | struct xensyms *xs = (struct xensyms *)m->private; | |
91 | struct xenpf_symdata *symdata = &xs->op.u.symdata; | |
92 | ||
93 | seq_printf(m, "%016llx %c %s\n", symdata->address, | |
94 | symdata->type, xs->name); | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
99 | static void xensyms_stop(struct seq_file *m, void *p) | |
100 | { | |
101 | } | |
102 | ||
103 | static const struct seq_operations xensyms_seq_ops = { | |
104 | .start = xensyms_start, | |
105 | .next = xensyms_next, | |
106 | .show = xensyms_show, | |
107 | .stop = xensyms_stop, | |
108 | }; | |
109 | ||
110 | static int xensyms_open(struct inode *inode, struct file *file) | |
111 | { | |
112 | struct seq_file *m; | |
113 | struct xensyms *xs; | |
114 | int ret; | |
115 | ||
116 | ret = seq_open_private(file, &xensyms_seq_ops, | |
117 | sizeof(struct xensyms)); | |
118 | if (ret) | |
119 | return ret; | |
120 | ||
121 | m = file->private_data; | |
122 | xs = (struct xensyms *)m->private; | |
123 | ||
124 | xs->namelen = XEN_KSYM_NAME_LEN + 1; | |
125 | xs->name = kzalloc(xs->namelen, GFP_KERNEL); | |
126 | if (!xs->name) { | |
127 | seq_release_private(inode, file); | |
128 | return -ENOMEM; | |
129 | } | |
130 | set_xen_guest_handle(xs->op.u.symdata.name, xs->name); | |
131 | xs->op.cmd = XENPF_get_symbol; | |
132 | xs->op.u.symdata.namelen = xs->namelen; | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
137 | static int xensyms_release(struct inode *inode, struct file *file) | |
138 | { | |
139 | struct seq_file *m = file->private_data; | |
140 | struct xensyms *xs = (struct xensyms *)m->private; | |
141 | ||
142 | kfree(xs->name); | |
143 | return seq_release_private(inode, file); | |
144 | } | |
145 | ||
146 | const struct file_operations xensyms_ops = { | |
147 | .open = xensyms_open, | |
148 | .read = seq_read, | |
149 | .llseek = seq_lseek, | |
150 | .release = xensyms_release | |
151 | }; |