diff options
Diffstat (limited to 'arch/x86/kernel/perf_regs.c')
-rw-r--r-- | arch/x86/kernel/perf_regs.c | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/arch/x86/kernel/perf_regs.c b/arch/x86/kernel/perf_regs.c new file mode 100644 index 00000000000..e309cc5c276 --- /dev/null +++ b/arch/x86/kernel/perf_regs.c | |||
@@ -0,0 +1,105 @@ | |||
1 | #include <linux/errno.h> | ||
2 | #include <linux/kernel.h> | ||
3 | #include <linux/sched.h> | ||
4 | #include <linux/perf_event.h> | ||
5 | #include <linux/bug.h> | ||
6 | #include <linux/stddef.h> | ||
7 | #include <asm/perf_regs.h> | ||
8 | #include <asm/ptrace.h> | ||
9 | |||
10 | #ifdef CONFIG_X86_32 | ||
11 | #define PERF_REG_X86_MAX PERF_REG_X86_32_MAX | ||
12 | #else | ||
13 | #define PERF_REG_X86_MAX PERF_REG_X86_64_MAX | ||
14 | #endif | ||
15 | |||
16 | #define PT_REGS_OFFSET(id, r) [id] = offsetof(struct pt_regs, r) | ||
17 | |||
18 | static unsigned int pt_regs_offset[PERF_REG_X86_MAX] = { | ||
19 | PT_REGS_OFFSET(PERF_REG_X86_AX, ax), | ||
20 | PT_REGS_OFFSET(PERF_REG_X86_BX, bx), | ||
21 | PT_REGS_OFFSET(PERF_REG_X86_CX, cx), | ||
22 | PT_REGS_OFFSET(PERF_REG_X86_DX, dx), | ||
23 | PT_REGS_OFFSET(PERF_REG_X86_SI, si), | ||
24 | PT_REGS_OFFSET(PERF_REG_X86_DI, di), | ||
25 | PT_REGS_OFFSET(PERF_REG_X86_BP, bp), | ||
26 | PT_REGS_OFFSET(PERF_REG_X86_SP, sp), | ||
27 | PT_REGS_OFFSET(PERF_REG_X86_IP, ip), | ||
28 | PT_REGS_OFFSET(PERF_REG_X86_FLAGS, flags), | ||
29 | PT_REGS_OFFSET(PERF_REG_X86_CS, cs), | ||
30 | PT_REGS_OFFSET(PERF_REG_X86_SS, ss), | ||
31 | #ifdef CONFIG_X86_32 | ||
32 | PT_REGS_OFFSET(PERF_REG_X86_DS, ds), | ||
33 | PT_REGS_OFFSET(PERF_REG_X86_ES, es), | ||
34 | PT_REGS_OFFSET(PERF_REG_X86_FS, fs), | ||
35 | PT_REGS_OFFSET(PERF_REG_X86_GS, gs), | ||
36 | #else | ||
37 | /* | ||
38 | * The pt_regs struct does not store | ||
39 | * ds, es, fs, gs in 64 bit mode. | ||
40 | */ | ||
41 | (unsigned int) -1, | ||
42 | (unsigned int) -1, | ||
43 | (unsigned int) -1, | ||
44 | (unsigned int) -1, | ||
45 | #endif | ||
46 | #ifdef CONFIG_X86_64 | ||
47 | PT_REGS_OFFSET(PERF_REG_X86_R8, r8), | ||
48 | PT_REGS_OFFSET(PERF_REG_X86_R9, r9), | ||
49 | PT_REGS_OFFSET(PERF_REG_X86_R10, r10), | ||
50 | PT_REGS_OFFSET(PERF_REG_X86_R11, r11), | ||
51 | PT_REGS_OFFSET(PERF_REG_X86_R12, r12), | ||
52 | PT_REGS_OFFSET(PERF_REG_X86_R13, r13), | ||
53 | PT_REGS_OFFSET(PERF_REG_X86_R14, r14), | ||
54 | PT_REGS_OFFSET(PERF_REG_X86_R15, r15), | ||
55 | #endif | ||
56 | }; | ||
57 | |||
58 | u64 perf_reg_value(struct pt_regs *regs, int idx) | ||
59 | { | ||
60 | if (WARN_ON_ONCE(idx >= ARRAY_SIZE(pt_regs_offset))) | ||
61 | return 0; | ||
62 | |||
63 | return regs_get_register(regs, pt_regs_offset[idx]); | ||
64 | } | ||
65 | |||
66 | #define REG_RESERVED (~((1ULL << PERF_REG_X86_MAX) - 1ULL)) | ||
67 | |||
68 | #ifdef CONFIG_X86_32 | ||
69 | int perf_reg_validate(u64 mask) | ||
70 | { | ||
71 | if (!mask || mask & REG_RESERVED) | ||
72 | return -EINVAL; | ||
73 | |||
74 | return 0; | ||
75 | } | ||
76 | |||
77 | u64 perf_reg_abi(struct task_struct *task) | ||
78 | { | ||
79 | return PERF_SAMPLE_REGS_ABI_32; | ||
80 | } | ||
81 | #else /* CONFIG_X86_64 */ | ||
82 | #define REG_NOSUPPORT ((1ULL << PERF_REG_X86_DS) | \ | ||
83 | (1ULL << PERF_REG_X86_ES) | \ | ||
84 | (1ULL << PERF_REG_X86_FS) | \ | ||
85 | (1ULL << PERF_REG_X86_GS)) | ||
86 | |||
87 | int perf_reg_validate(u64 mask) | ||
88 | { | ||
89 | if (!mask || mask & REG_RESERVED) | ||
90 | return -EINVAL; | ||
91 | |||
92 | if (mask & REG_NOSUPPORT) | ||
93 | return -EINVAL; | ||
94 | |||
95 | return 0; | ||
96 | } | ||
97 | |||
98 | u64 perf_reg_abi(struct task_struct *task) | ||
99 | { | ||
100 | if (test_tsk_thread_flag(task, TIF_IA32)) | ||
101 | return PERF_SAMPLE_REGS_ABI_32; | ||
102 | else | ||
103 | return PERF_SAMPLE_REGS_ABI_64; | ||
104 | } | ||
105 | #endif /* CONFIG_X86_32 */ | ||