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[] = { | |
36 | { "xscale1", "arm/xscale1" }, | |
37 | { "xscale1", "arm/xscale2" }, | |
38 | { "v6", "arm/armv6" }, | |
39 | { "v6mpcore", "arm/mpcore" }, | |
40 | { "ARMv7 Cortex-A8", "arm/armv7" }, | |
41 | { "ARMv7 Cortex-A9", "arm/armv7-ca9" }, | |
42 | }; | |
43 | ||
56946331 | 44 | char *op_name_from_perf_id(void) |
8c1fc96f | 45 | { |
4295b898 WD |
46 | int i; |
47 | struct op_perf_name names; | |
48 | const char *perf_name = perf_pmu_name(); | |
56946331 | 49 | |
4295b898 WD |
50 | for (i = 0; i < ARRAY_SIZE(op_perf_name_map); ++i) { |
51 | names = op_perf_name_map[i]; | |
52 | if (!strcmp(names.perf_name, perf_name)) | |
53 | return names.op_name; | |
8c1fc96f | 54 | } |
4295b898 WD |
55 | |
56 | return NULL; | |
8c1fc96f | 57 | } |
d14dd7e2 | 58 | #endif |
1da177e4 | 59 | |
8c1fc96f | 60 | static int report_trace(struct stackframe *frame, void *d) |
1da177e4 | 61 | { |
8c1fc96f | 62 | unsigned int *depth = d; |
c6b9dafc | 63 | |
8c1fc96f WD |
64 | if (*depth) { |
65 | oprofile_add_trace(frame->pc); | |
66 | (*depth)--; | |
67 | } | |
1b7b5698 | 68 | |
8c1fc96f WD |
69 | return *depth == 0; |
70 | } | |
c6b9dafc | 71 | |
8c1fc96f WD |
72 | /* |
73 | * The registers we're interested in are at the end of the variable | |
74 | * length saved register structure. The fp points at the end of this | |
75 | * structure so the address of this struct is: | |
76 | * (struct frame_tail *)(xxx->fp)-1 | |
77 | */ | |
78 | struct frame_tail { | |
79 | struct frame_tail *fp; | |
80 | unsigned long sp; | |
81 | unsigned long lr; | |
82 | } __attribute__((packed)); | |
2d9e1ae0 | 83 | |
8c1fc96f WD |
84 | static struct frame_tail* user_backtrace(struct frame_tail *tail) |
85 | { | |
86 | struct frame_tail buftail[2]; | |
10c03f69 | 87 | |
8c1fc96f WD |
88 | /* Also check accessibility of one struct frame_tail beyond */ |
89 | if (!access_ok(VERIFY_READ, tail, sizeof(buftail))) | |
90 | return NULL; | |
91 | if (__copy_from_user_inatomic(buftail, tail, sizeof(buftail))) | |
92 | return NULL; | |
d7ac4e28 | 93 | |
8c1fc96f | 94 | oprofile_add_trace(buftail[0].lr); |
c6b9dafc | 95 | |
8c1fc96f WD |
96 | /* frame pointers should strictly progress back up the stack |
97 | * (towards higher addresses) */ | |
cb06199b | 98 | if (tail + 1 >= buftail[0].fp) |
8c1fc96f WD |
99 | return NULL; |
100 | ||
101 | return buftail[0].fp-1; | |
102 | } | |
103 | ||
104 | static void arm_backtrace(struct pt_regs * const regs, unsigned int depth) | |
105 | { | |
106 | struct frame_tail *tail = ((struct frame_tail *) regs->ARM_fp) - 1; | |
107 | ||
108 | if (!user_mode(regs)) { | |
109 | struct stackframe frame; | |
110 | frame.fp = regs->ARM_fp; | |
111 | frame.sp = regs->ARM_sp; | |
112 | frame.lr = regs->ARM_lr; | |
113 | frame.pc = regs->ARM_pc; | |
114 | walk_stackframe(&frame, report_trace, &depth); | |
115 | return; | |
116 | } | |
117 | ||
118 | while (depth-- && tail && !((unsigned long) tail & 3)) | |
119 | tail = user_backtrace(tail); | |
120 | } | |
121 | ||
58850e21 MF |
122 | int __init oprofile_arch_init(struct oprofile_operations *ops) |
123 | { | |
d14dd7e2 | 124 | /* provide backtrace support also in timer mode: */ |
58850e21 MF |
125 | ops->backtrace = arm_backtrace; |
126 | ||
127 | return oprofile_perf_init(ops); | |
128 | } | |
129 | ||
55205c91 | 130 | void oprofile_arch_exit(void) |
58850e21 MF |
131 | { |
132 | oprofile_perf_exit(); | |
133 | } |