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c5e63197 JO |
1 | #include <linux/errno.h> |
2 | #include <linux/kernel.h> | |
4018994f JO |
3 | #include <linux/sched.h> |
4 | #include <linux/perf_event.h> | |
c5e63197 JO |
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 | { | |
1e6dd8ad | 60 | if (WARN_ON_ONCE(idx >= ARRAY_SIZE(pt_regs_offset))) |
c5e63197 JO |
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 | } | |
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76 | |
77 | u64 perf_reg_abi(struct task_struct *task) | |
78 | { | |
79 | return PERF_SAMPLE_REGS_ABI_32; | |
80 | } | |
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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 | } | |
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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 | } | |
c5e63197 | 105 | #endif /* CONFIG_X86_32 */ |