1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright 2016 Anju T, IBM Corporation.
4 */
5
6#include <linux/errno.h>
7#include <linux/kernel.h>
8#include <linux/sched.h>
9#include <linux/sched/task_stack.h>
10#include <linux/perf_event.h>
11#include <linux/bug.h>
12#include <linux/stddef.h>
13#include <asm/ptrace.h>
14#include <asm/perf_regs.h>
15
16u64 PERF_REG_EXTENDED_MASK;
17
18#define PT_REGS_OFFSET(id, r) [id] = offsetof(struct pt_regs, r)
19
20#define REG_RESERVED (~(PERF_REG_EXTENDED_MASK | PERF_REG_PMU_MASK))
21
22static unsigned int pt_regs_offset[PERF_REG_POWERPC_MAX] = {
23 PT_REGS_OFFSET(PERF_REG_POWERPC_R0, gpr[0]),
24 PT_REGS_OFFSET(PERF_REG_POWERPC_R1, gpr[1]),
25 PT_REGS_OFFSET(PERF_REG_POWERPC_R2, gpr[2]),
26 PT_REGS_OFFSET(PERF_REG_POWERPC_R3, gpr[3]),
27 PT_REGS_OFFSET(PERF_REG_POWERPC_R4, gpr[4]),
28 PT_REGS_OFFSET(PERF_REG_POWERPC_R5, gpr[5]),
29 PT_REGS_OFFSET(PERF_REG_POWERPC_R6, gpr[6]),
30 PT_REGS_OFFSET(PERF_REG_POWERPC_R7, gpr[7]),
31 PT_REGS_OFFSET(PERF_REG_POWERPC_R8, gpr[8]),
32 PT_REGS_OFFSET(PERF_REG_POWERPC_R9, gpr[9]),
33 PT_REGS_OFFSET(PERF_REG_POWERPC_R10, gpr[10]),
34 PT_REGS_OFFSET(PERF_REG_POWERPC_R11, gpr[11]),
35 PT_REGS_OFFSET(PERF_REG_POWERPC_R12, gpr[12]),
36 PT_REGS_OFFSET(PERF_REG_POWERPC_R13, gpr[13]),
37 PT_REGS_OFFSET(PERF_REG_POWERPC_R14, gpr[14]),
38 PT_REGS_OFFSET(PERF_REG_POWERPC_R15, gpr[15]),
39 PT_REGS_OFFSET(PERF_REG_POWERPC_R16, gpr[16]),
40 PT_REGS_OFFSET(PERF_REG_POWERPC_R17, gpr[17]),
41 PT_REGS_OFFSET(PERF_REG_POWERPC_R18, gpr[18]),
42 PT_REGS_OFFSET(PERF_REG_POWERPC_R19, gpr[19]),
43 PT_REGS_OFFSET(PERF_REG_POWERPC_R20, gpr[20]),
44 PT_REGS_OFFSET(PERF_REG_POWERPC_R21, gpr[21]),
45 PT_REGS_OFFSET(PERF_REG_POWERPC_R22, gpr[22]),
46 PT_REGS_OFFSET(PERF_REG_POWERPC_R23, gpr[23]),
47 PT_REGS_OFFSET(PERF_REG_POWERPC_R24, gpr[24]),
48 PT_REGS_OFFSET(PERF_REG_POWERPC_R25, gpr[25]),
49 PT_REGS_OFFSET(PERF_REG_POWERPC_R26, gpr[26]),
50 PT_REGS_OFFSET(PERF_REG_POWERPC_R27, gpr[27]),
51 PT_REGS_OFFSET(PERF_REG_POWERPC_R28, gpr[28]),
52 PT_REGS_OFFSET(PERF_REG_POWERPC_R29, gpr[29]),
53 PT_REGS_OFFSET(PERF_REG_POWERPC_R30, gpr[30]),
54 PT_REGS_OFFSET(PERF_REG_POWERPC_R31, gpr[31]),
55 PT_REGS_OFFSET(PERF_REG_POWERPC_NIP, nip),
56 PT_REGS_OFFSET(PERF_REG_POWERPC_MSR, msr),
57 PT_REGS_OFFSET(PERF_REG_POWERPC_ORIG_R3, orig_gpr3),
58 PT_REGS_OFFSET(PERF_REG_POWERPC_CTR, ctr),
59 PT_REGS_OFFSET(PERF_REG_POWERPC_LINK, link),
60 PT_REGS_OFFSET(PERF_REG_POWERPC_XER, xer),
61 PT_REGS_OFFSET(PERF_REG_POWERPC_CCR, ccr),
62#ifdef CONFIG_PPC64
63 PT_REGS_OFFSET(PERF_REG_POWERPC_SOFTE, softe),
64#else
65 PT_REGS_OFFSET(PERF_REG_POWERPC_SOFTE, mq),
66#endif
67 PT_REGS_OFFSET(PERF_REG_POWERPC_TRAP, trap),
68 PT_REGS_OFFSET(PERF_REG_POWERPC_DAR, dar),
69 PT_REGS_OFFSET(PERF_REG_POWERPC_DSISR, dsisr),
70 PT_REGS_OFFSET(PERF_REG_POWERPC_SIER, dar),
71 PT_REGS_OFFSET(PERF_REG_POWERPC_MMCRA, dsisr),
72};
73
74/* Function to return the extended register values */
75static u64 get_ext_regs_value(int idx)
76{
77 switch (idx) {
78 case PERF_REG_POWERPC_PMC1 ... PERF_REG_POWERPC_PMC6:
79 return get_pmcs_ext_regs(idx - PERF_REG_POWERPC_PMC1);
80 case PERF_REG_POWERPC_MMCR0:
81 return mfspr(SPRN_MMCR0);
82 case PERF_REG_POWERPC_MMCR1:
83 return mfspr(SPRN_MMCR1);
84 case PERF_REG_POWERPC_MMCR2:
85 return mfspr(SPRN_MMCR2);
86#ifdef CONFIG_PPC64
87 case PERF_REG_POWERPC_MMCR3:
88 return mfspr(SPRN_MMCR3);
89 case PERF_REG_POWERPC_SIER2:
90 return mfspr(SPRN_SIER2);
91 case PERF_REG_POWERPC_SIER3:
92 return mfspr(SPRN_SIER3);
93 case PERF_REG_POWERPC_SDAR:
94 return mfspr(SPRN_SDAR);
95#endif
96 case PERF_REG_POWERPC_SIAR:
97 return mfspr(SPRN_SIAR);
98 default: return 0;
99 }
100}
101
102u64 perf_reg_value(struct pt_regs *regs, int idx)
103{
104 if (idx == PERF_REG_POWERPC_SIER &&
105 (IS_ENABLED(CONFIG_FSL_EMB_PERF_EVENT) ||
106 IS_ENABLED(CONFIG_PPC32) ||
107 !is_sier_available()))
108 return 0;
109
110 if (idx == PERF_REG_POWERPC_MMCRA &&
111 (IS_ENABLED(CONFIG_FSL_EMB_PERF_EVENT) ||
112 IS_ENABLED(CONFIG_PPC32)))
113 return 0;
114
115 if (idx >= PERF_REG_POWERPC_MAX && idx < PERF_REG_EXTENDED_MAX)
116 return get_ext_regs_value(idx);
117
118 /*
119 * If the idx is referring to value beyond the
120 * supported registers, return 0 with a warning
121 */
122 if (WARN_ON_ONCE(idx >= PERF_REG_EXTENDED_MAX))
123 return 0;
124
125 return regs_get_register(regs, offset: pt_regs_offset[idx]);
126}
127
128int perf_reg_validate(u64 mask)
129{
130 if (!mask || mask & REG_RESERVED)
131 return -EINVAL;
132 return 0;
133}
134
135u64 perf_reg_abi(struct task_struct *task)
136{
137 if (is_tsk_32bit_task(task))
138 return PERF_SAMPLE_REGS_ABI_32;
139 else
140 return PERF_SAMPLE_REGS_ABI_64;
141}
142
143void perf_get_regs_user(struct perf_regs *regs_user,
144 struct pt_regs *regs)
145{
146 regs_user->regs = task_pt_regs(current);
147 regs_user->abi = (regs_user->regs) ? perf_reg_abi(current) :
148 PERF_SAMPLE_REGS_ABI_NONE;
149}
150

source code of linux/arch/powerpc/perf/perf_regs.c