Commit | Line | Data |
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1da177e4 LT |
1 | /** |
2 | * @file common.c | |
3 | * | |
4 | * @remark Copyright 2004 Oprofile Authors | |
8c1fc96f | 5 | * @remark Copyright 2010 ARM Ltd. |
1da177e4 LT |
6 | * @remark Read the file COPYING |
7 | * | |
8 | * @author Zwane Mwaikambo | |
8c1fc96f | 9 | * @author Will Deacon [move to perf] |
1da177e4 LT |
10 | */ |
11 | ||
8c1fc96f | 12 | #include <linux/cpumask.h> |
1da177e4 | 13 | #include <linux/init.h> |
8c1fc96f | 14 | #include <linux/mutex.h> |
1da177e4 | 15 | #include <linux/oprofile.h> |
8c1fc96f | 16 | #include <linux/perf_event.h> |
d1e86d64 | 17 | #include <linux/platform_device.h> |
ae92dc9f | 18 | #include <linux/slab.h> |
8c1fc96f WD |
19 | #include <asm/stacktrace.h> |
20 | #include <linux/uaccess.h> | |
21 | ||
22 | #include <asm/perf_event.h> | |
23 | #include <asm/ptrace.h> | |
1da177e4 | 24 | |
8c1fc96f | 25 | #ifdef CONFIG_HW_PERF_EVENTS |
4295b898 WD |
26 | |
27 | /* | |
28 | * OProfile has a curious naming scheme for the ARM PMUs, but they are | |
29 | * part of the user ABI so we need to map from the perf PMU name for | |
30 | * supported PMUs. | |
31 | */ | |
32 | static struct op_perf_name { | |
33 | char *perf_name; | |
34 | char *op_name; | |
35 | } op_perf_name_map[] = { | |
3d1ff755 MR |
36 | { "armv5_xscale1", "arm/xscale1" }, |
37 | { "armv5_xscale2", "arm/xscale2" }, | |
38 | { "armv6_1136", "arm/armv6" }, | |
39 | { "armv6_1156", "arm/armv6" }, | |
40 | { "armv6_1176", "arm/armv6" }, | |
41 | { "armv6_11mpcore", "arm/mpcore" }, | |
42 | { "armv7_cortex_a8", "arm/armv7" }, | |
43 | { "armv7_cortex_a9", "arm/armv7-ca9" }, | |
4295b898 WD |
44 | }; |
45 | ||
56946331 | 46 | char *op_name_from_perf_id(void) |
8c1fc96f | 47 | { |
4295b898 WD |
48 | int i; |
49 | struct op_perf_name names; | |
50 | const char *perf_name = perf_pmu_name(); | |
56946331 | 51 | |
4295b898 WD |
52 | for (i = 0; i < ARRAY_SIZE(op_perf_name_map); ++i) { |
53 | names = op_perf_name_map[i]; | |
54 | if (!strcmp(names.perf_name, perf_name)) | |
55 | return names.op_name; | |
8c1fc96f | 56 | } |
4295b898 WD |
57 | |
58 | return NULL; | |
8c1fc96f | 59 | } |
d14dd7e2 | 60 | #endif |
1da177e4 | 61 | |
8c1fc96f | 62 | static int report_trace(struct stackframe *frame, void *d) |
1da177e4 | 63 | { |
8c1fc96f | 64 | unsigned int *depth = d; |
c6b9dafc | 65 | |
8c1fc96f WD |
66 | if (*depth) { |
67 | oprofile_add_trace(frame->pc); | |
68 | (*depth)--; | |
69 | } | |
1b7b5698 | 70 | |
8c1fc96f WD |
71 | return *depth == 0; |
72 | } | |
c6b9dafc | 73 | |
8c1fc96f WD |
74 | /* |
75 | * The registers we're interested in are at the end of the variable | |
76 | * length saved register structure. The fp points at the end of this | |
77 | * structure so the address of this struct is: | |
78 | * (struct frame_tail *)(xxx->fp)-1 | |
79 | */ | |
80 | struct frame_tail { | |
81 | struct frame_tail *fp; | |
82 | unsigned long sp; | |
83 | unsigned long lr; | |
84 | } __attribute__((packed)); | |
2d9e1ae0 | 85 | |
8c1fc96f WD |
86 | static struct frame_tail* user_backtrace(struct frame_tail *tail) |
87 | { | |
88 | struct frame_tail buftail[2]; | |
10c03f69 | 89 | |
8c1fc96f WD |
90 | /* Also check accessibility of one struct frame_tail beyond */ |
91 | if (!access_ok(VERIFY_READ, tail, sizeof(buftail))) | |
92 | return NULL; | |
93 | if (__copy_from_user_inatomic(buftail, tail, sizeof(buftail))) | |
94 | return NULL; | |
d7ac4e28 | 95 | |
8c1fc96f | 96 | oprofile_add_trace(buftail[0].lr); |
c6b9dafc | 97 | |
8c1fc96f WD |
98 | /* frame pointers should strictly progress back up the stack |
99 | * (towards higher addresses) */ | |
cb06199b | 100 | if (tail + 1 >= buftail[0].fp) |
8c1fc96f WD |
101 | return NULL; |
102 | ||
103 | return buftail[0].fp-1; | |
104 | } | |
105 | ||
106 | static void arm_backtrace(struct pt_regs * const regs, unsigned int depth) | |
107 | { | |
108 | struct frame_tail *tail = ((struct frame_tail *) regs->ARM_fp) - 1; | |
109 | ||
110 | if (!user_mode(regs)) { | |
111 | struct stackframe frame; | |
e8a5dbc5 | 112 | arm_get_current_stackframe(regs, &frame); |
8c1fc96f WD |
113 | walk_stackframe(&frame, report_trace, &depth); |
114 | return; | |
115 | } | |
116 | ||
117 | while (depth-- && tail && !((unsigned long) tail & 3)) | |
118 | tail = user_backtrace(tail); | |
119 | } | |
120 | ||
58850e21 MF |
121 | int __init oprofile_arch_init(struct oprofile_operations *ops) |
122 | { | |
d14dd7e2 | 123 | /* provide backtrace support also in timer mode: */ |
58850e21 MF |
124 | ops->backtrace = arm_backtrace; |
125 | ||
126 | return oprofile_perf_init(ops); | |
127 | } | |
128 | ||
55205c91 | 129 | void oprofile_arch_exit(void) |
58850e21 MF |
130 | { |
131 | oprofile_perf_exit(); | |
132 | } |