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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> |
d1e86d64 | 13 | #include <linux/err.h> |
8c1fc96f | 14 | #include <linux/errno.h> |
1da177e4 | 15 | #include <linux/init.h> |
8c1fc96f | 16 | #include <linux/mutex.h> |
1da177e4 | 17 | #include <linux/oprofile.h> |
8c1fc96f | 18 | #include <linux/perf_event.h> |
d1e86d64 | 19 | #include <linux/platform_device.h> |
ae92dc9f | 20 | #include <linux/slab.h> |
8c1fc96f WD |
21 | #include <asm/stacktrace.h> |
22 | #include <linux/uaccess.h> | |
23 | ||
24 | #include <asm/perf_event.h> | |
25 | #include <asm/ptrace.h> | |
1da177e4 | 26 | |
8c1fc96f | 27 | #ifdef CONFIG_HW_PERF_EVENTS |
56946331 | 28 | char *op_name_from_perf_id(void) |
8c1fc96f | 29 | { |
56946331 MF |
30 | enum arm_perf_pmu_ids id = armpmu_get_pmu_id(); |
31 | ||
8c1fc96f WD |
32 | switch (id) { |
33 | case ARM_PERF_PMU_ID_XSCALE1: | |
34 | return "arm/xscale1"; | |
35 | case ARM_PERF_PMU_ID_XSCALE2: | |
36 | return "arm/xscale2"; | |
37 | case ARM_PERF_PMU_ID_V6: | |
38 | return "arm/armv6"; | |
39 | case ARM_PERF_PMU_ID_V6MP: | |
40 | return "arm/mpcore"; | |
41 | case ARM_PERF_PMU_ID_CA8: | |
42 | return "arm/armv7"; | |
43 | case ARM_PERF_PMU_ID_CA9: | |
44 | return "arm/armv7-ca9"; | |
45 | default: | |
46 | return NULL; | |
47 | } | |
48 | } | |
1da177e4 | 49 | |
8c1fc96f | 50 | static int report_trace(struct stackframe *frame, void *d) |
1da177e4 | 51 | { |
8c1fc96f | 52 | unsigned int *depth = d; |
c6b9dafc | 53 | |
8c1fc96f WD |
54 | if (*depth) { |
55 | oprofile_add_trace(frame->pc); | |
56 | (*depth)--; | |
57 | } | |
1b7b5698 | 58 | |
8c1fc96f WD |
59 | return *depth == 0; |
60 | } | |
c6b9dafc | 61 | |
8c1fc96f WD |
62 | /* |
63 | * The registers we're interested in are at the end of the variable | |
64 | * length saved register structure. The fp points at the end of this | |
65 | * structure so the address of this struct is: | |
66 | * (struct frame_tail *)(xxx->fp)-1 | |
67 | */ | |
68 | struct frame_tail { | |
69 | struct frame_tail *fp; | |
70 | unsigned long sp; | |
71 | unsigned long lr; | |
72 | } __attribute__((packed)); | |
2d9e1ae0 | 73 | |
8c1fc96f WD |
74 | static struct frame_tail* user_backtrace(struct frame_tail *tail) |
75 | { | |
76 | struct frame_tail buftail[2]; | |
10c03f69 | 77 | |
8c1fc96f WD |
78 | /* Also check accessibility of one struct frame_tail beyond */ |
79 | if (!access_ok(VERIFY_READ, tail, sizeof(buftail))) | |
80 | return NULL; | |
81 | if (__copy_from_user_inatomic(buftail, tail, sizeof(buftail))) | |
82 | return NULL; | |
d7ac4e28 | 83 | |
8c1fc96f | 84 | oprofile_add_trace(buftail[0].lr); |
c6b9dafc | 85 | |
8c1fc96f WD |
86 | /* frame pointers should strictly progress back up the stack |
87 | * (towards higher addresses) */ | |
88 | if (tail >= buftail[0].fp) | |
89 | return NULL; | |
90 | ||
91 | return buftail[0].fp-1; | |
92 | } | |
93 | ||
94 | static void arm_backtrace(struct pt_regs * const regs, unsigned int depth) | |
95 | { | |
96 | struct frame_tail *tail = ((struct frame_tail *) regs->ARM_fp) - 1; | |
97 | ||
98 | if (!user_mode(regs)) { | |
99 | struct stackframe frame; | |
100 | frame.fp = regs->ARM_fp; | |
101 | frame.sp = regs->ARM_sp; | |
102 | frame.lr = regs->ARM_lr; | |
103 | frame.pc = regs->ARM_pc; | |
104 | walk_stackframe(&frame, report_trace, &depth); | |
105 | return; | |
106 | } | |
107 | ||
108 | while (depth-- && tail && !((unsigned long) tail & 3)) | |
109 | tail = user_backtrace(tail); | |
110 | } | |
111 | ||
58850e21 MF |
112 | int __init oprofile_arch_init(struct oprofile_operations *ops) |
113 | { | |
114 | ops->backtrace = arm_backtrace; | |
115 | ||
116 | return oprofile_perf_init(ops); | |
117 | } | |
118 | ||
58850e21 MF |
119 | void __exit oprofile_arch_exit(void) |
120 | { | |
121 | oprofile_perf_exit(); | |
122 | } | |
8c1fc96f WD |
123 | #else |
124 | int __init oprofile_arch_init(struct oprofile_operations *ops) | |
125 | { | |
126 | pr_info("oprofile: hardware counters not available\n"); | |
127 | return -ENODEV; | |
1da177e4 | 128 | } |
c7fd239a | 129 | void __exit oprofile_arch_exit(void) {} |
8c1fc96f | 130 | #endif /* CONFIG_HW_PERF_EVENTS */ |