1 /*
2 * Copyright 2016 Anju T, IBM Corporation.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 */
9
10 #include <linux/errno.h>
11 #include <linux/kernel.h>
12 #include <linux/sched.h>
13 #include <linux/sched/task_stack.h>
14 #include <linux/perf_event.h>
15 #include <linux/bug.h>
16 #include <linux/stddef.h>
17 #include <asm/ptrace.h>
18 #include <asm/perf_regs.h>
19
20 #define PT_REGS_OFFSET(id, r) [id] = offsetof(struct pt_regs, r)
21
22 #define REG_RESERVED (~((1ULL << PERF_REG_POWERPC_MAX) - 1))
23
24 static unsigned int pt_regs_offset[PERF_REG_POWERPC_MAX] = {
25 PT_REGS_OFFSET(PERF_REG_POWERPC_R0, gpr[0]),
26 PT_REGS_OFFSET(PERF_REG_POWERPC_R1, gpr[1]),
27 PT_REGS_OFFSET(PERF_REG_POWERPC_R2, gpr[2]),
28 PT_REGS_OFFSET(PERF_REG_POWERPC_R3, gpr[3]),
29 PT_REGS_OFFSET(PERF_REG_POWERPC_R4, gpr[4]),
30 PT_REGS_OFFSET(PERF_REG_POWERPC_R5, gpr[5]),
31 PT_REGS_OFFSET(PERF_REG_POWERPC_R6, gpr[6]),
32 PT_REGS_OFFSET(PERF_REG_POWERPC_R7, gpr[7]),
33 PT_REGS_OFFSET(PERF_REG_POWERPC_R8, gpr[8]),
34 PT_REGS_OFFSET(PERF_REG_POWERPC_R9, gpr[9]),
35 PT_REGS_OFFSET(PERF_REG_POWERPC_R10, gpr[10]),
36 PT_REGS_OFFSET(PERF_REG_POWERPC_R11, gpr[11]),
37 PT_REGS_OFFSET(PERF_REG_POWERPC_R12, gpr[12]),
38 PT_REGS_OFFSET(PERF_REG_POWERPC_R13, gpr[13]),
39 PT_REGS_OFFSET(PERF_REG_POWERPC_R14, gpr[14]),
40 PT_REGS_OFFSET(PERF_REG_POWERPC_R15, gpr[15]),
41 PT_REGS_OFFSET(PERF_REG_POWERPC_R16, gpr[16]),
42 PT_REGS_OFFSET(PERF_REG_POWERPC_R17, gpr[17]),
43 PT_REGS_OFFSET(PERF_REG_POWERPC_R18, gpr[18]),
44 PT_REGS_OFFSET(PERF_REG_POWERPC_R19, gpr[19]),
45 PT_REGS_OFFSET(PERF_REG_POWERPC_R20, gpr[20]),
46 PT_REGS_OFFSET(PERF_REG_POWERPC_R21, gpr[21]),
47 PT_REGS_OFFSET(PERF_REG_POWERPC_R22, gpr[22]),
48 PT_REGS_OFFSET(PERF_REG_POWERPC_R23, gpr[23]),
49 PT_REGS_OFFSET(PERF_REG_POWERPC_R24, gpr[24]),
50 PT_REGS_OFFSET(PERF_REG_POWERPC_R25, gpr[25]),
51 PT_REGS_OFFSET(PERF_REG_POWERPC_R26, gpr[26]),
52 PT_REGS_OFFSET(PERF_REG_POWERPC_R27, gpr[27]),
53 PT_REGS_OFFSET(PERF_REG_POWERPC_R28, gpr[28]),
54 PT_REGS_OFFSET(PERF_REG_POWERPC_R29, gpr[29]),
55 PT_REGS_OFFSET(PERF_REG_POWERPC_R30, gpr[30]),
56 PT_REGS_OFFSET(PERF_REG_POWERPC_R31, gpr[31]),
57 PT_REGS_OFFSET(PERF_REG_POWERPC_NIP, nip),
58 PT_REGS_OFFSET(PERF_REG_POWERPC_MSR, msr),
59 PT_REGS_OFFSET(PERF_REG_POWERPC_ORIG_R3, orig_gpr3),
60 PT_REGS_OFFSET(PERF_REG_POWERPC_CTR, ctr),
61 PT_REGS_OFFSET(PERF_REG_POWERPC_LINK, link),
62 PT_REGS_OFFSET(PERF_REG_POWERPC_XER, xer),
63 PT_REGS_OFFSET(PERF_REG_POWERPC_CCR, ccr),
64 #ifdef CONFIG_PPC64
65 PT_REGS_OFFSET(PERF_REG_POWERPC_SOFTE, softe),
66 #else
67 PT_REGS_OFFSET(PERF_REG_POWERPC_SOFTE, mq),
68 #endif
69 PT_REGS_OFFSET(PERF_REG_POWERPC_TRAP, trap),
70 PT_REGS_OFFSET(PERF_REG_POWERPC_DAR, dar),
71 PT_REGS_OFFSET(PERF_REG_POWERPC_DSISR, dsisr),
72 };
73
perf_reg_value(struct pt_regs * regs,int idx)74 u64 perf_reg_value(struct pt_regs *regs, int idx)
75 {
76 if (WARN_ON_ONCE(idx >= PERF_REG_POWERPC_MAX))
77 return 0;
78
79 return regs_get_register(regs, pt_regs_offset[idx]);
80 }
81
perf_reg_validate(u64 mask)82 int perf_reg_validate(u64 mask)
83 {
84 if (!mask || mask & REG_RESERVED)
85 return -EINVAL;
86 return 0;
87 }
88
perf_reg_abi(struct task_struct * task)89 u64 perf_reg_abi(struct task_struct *task)
90 {
91 #ifdef CONFIG_PPC64
92 if (!test_tsk_thread_flag(task, TIF_32BIT))
93 return PERF_SAMPLE_REGS_ABI_64;
94 else
95 #endif
96 return PERF_SAMPLE_REGS_ABI_32;
97 }
98
perf_get_regs_user(struct perf_regs * regs_user,struct pt_regs * regs,struct pt_regs * regs_user_copy)99 void perf_get_regs_user(struct perf_regs *regs_user,
100 struct pt_regs *regs,
101 struct pt_regs *regs_user_copy)
102 {
103 regs_user->regs = task_pt_regs(current);
104 regs_user->abi = (regs_user->regs) ? perf_reg_abi(current) :
105 PERF_SAMPLE_REGS_ABI_NONE;
106 }
107
