1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/compat.h> !! 2 /*
3 #include <linux/errno.h> !! 3 * This file is subject to the terms and conditions of the GNU General Public
4 #include <linux/kernel.h> !! 4 * License. See the file "COPYING" in the main directory of this archive
>> 5 * for more details.
>> 6 *
>> 7 * Some parts derived from x86 version of this file.
>> 8 *
>> 9 * Copyright (C) 2013 Cavium, Inc.
>> 10 */
>> 11
5 #include <linux/perf_event.h> 12 #include <linux/perf_event.h>
6 #include <linux/bug.h> <<
7 #include <linux/sched/task_stack.h> <<
8 13
9 #include <asm/perf_regs.h> <<
10 #include <asm/ptrace.h> 14 #include <asm/ptrace.h>
11 15
12 static u64 perf_ext_regs_value(int idx) !! 16 #ifdef CONFIG_32BIT
>> 17 u64 perf_reg_abi(struct task_struct *tsk)
13 { 18 {
14 switch (idx) { !! 19 return PERF_SAMPLE_REGS_ABI_32;
15 case PERF_REG_ARM64_VG: <<
16 if (WARN_ON_ONCE(!system_suppo <<
17 return 0; <<
18 <<
19 /* <<
20 * Vector granule is current l <<
21 * divided by 64. <<
22 */ <<
23 return (task_get_sve_vl(curren <<
24 default: <<
25 WARN_ON_ONCE(true); <<
26 return 0; <<
27 } <<
28 } 20 }
29 !! 21 #else /* Must be CONFIG_64BIT */
30 u64 perf_reg_value(struct pt_regs *regs, int i !! 22 u64 perf_reg_abi(struct task_struct *tsk)
31 { 23 {
32 if (WARN_ON_ONCE((u32)idx >= PERF_REG_ !! 24 if (test_tsk_thread_flag(tsk, TIF_32BIT_REGS))
33 return 0; !! 25 return PERF_SAMPLE_REGS_ABI_32;
34 !! 26 else
35 /* !! 27 return PERF_SAMPLE_REGS_ABI_64;
36 * Our handling of compat tasks (PERF_ <<
37 * we're stuck with it for ABI compati <<
38 * <<
39 * For a 32-bit consumer inspecting a <<
40 * the first 16 registers (see arch/ar <<
41 * These correspond directly to a pref <<
42 * 'struct pt_regs', with the exceptio <<
43 * (x15 corresponds to SP_hyp in the a <<
44 * <<
45 * So far, so good. <<
46 * <<
47 * The oddity arises when a 64-bit con <<
48 * asks for registers beyond PERF_REG_ <<
49 * SP_usr, LR_usr and PC in the positi <<
50 * PC registers would normally live. T <<
51 * 64-bit unwinder to unwind a 32-bit <<
52 * how well that works in practice, so <<
53 * <<
54 * At the time we make a sample, we do <<
55 * 32-bit or 64-bit, so we have to cat <<
56 */ <<
57 if (compat_user_mode(regs)) { <<
58 if ((u32)idx == PERF_REG_ARM64 <<
59 return regs->compat_sp <<
60 if ((u32)idx == PERF_REG_ARM64 <<
61 return regs->compat_lr <<
62 if (idx == 15) <<
63 return regs->pc; <<
64 } <<
65 <<
66 if ((u32)idx == PERF_REG_ARM64_SP) <<
67 return regs->sp; <<
68 <<
69 if ((u32)idx == PERF_REG_ARM64_PC) <<
70 return regs->pc; <<
71 <<
72 if ((u32)idx >= PERF_REG_ARM64_MAX) <<
73 return perf_ext_regs_value(idx <<
74 <<
75 return regs->regs[idx]; <<
76 } 28 }
77 !! 29 #endif /* CONFIG_32BIT */
78 #define REG_RESERVED (~((1ULL << PERF_REG_ARM6 <<
79 30
80 int perf_reg_validate(u64 mask) 31 int perf_reg_validate(u64 mask)
81 { 32 {
82 u64 reserved_mask = REG_RESERVED; !! 33 if (!mask)
83 !! 34 return -EINVAL;
84 if (system_supports_sve()) !! 35 if (mask & ~((1ull << PERF_REG_MIPS_MAX) - 1))
85 reserved_mask &= ~(1ULL << PER <<
86 <<
87 if (!mask || mask & reserved_mask) <<
88 return -EINVAL; 36 return -EINVAL;
89 <<
90 return 0; 37 return 0;
91 } 38 }
92 39
93 u64 perf_reg_abi(struct task_struct *task) !! 40 u64 perf_reg_value(struct pt_regs *regs, int idx)
94 { 41 {
95 if (is_compat_thread(task_thread_info( !! 42 long v;
96 return PERF_SAMPLE_REGS_ABI_32 !! 43
97 else !! 44 switch (idx) {
98 return PERF_SAMPLE_REGS_ABI_64 !! 45 case PERF_REG_MIPS_PC:
>> 46 v = regs->cp0_epc;
>> 47 break;
>> 48 case PERF_REG_MIPS_R1 ... PERF_REG_MIPS_R25:
>> 49 v = regs->regs[idx - PERF_REG_MIPS_R1 + 1];
>> 50 break;
>> 51 case PERF_REG_MIPS_R28 ... PERF_REG_MIPS_R31:
>> 52 v = regs->regs[idx - PERF_REG_MIPS_R28 + 28];
>> 53 break;
>> 54
>> 55 default:
>> 56 WARN_ON_ONCE(1);
>> 57 return 0;
>> 58 }
>> 59
>> 60 return (s64)v; /* Sign extend if 32-bit. */
99 } 61 }
100 62
101 void perf_get_regs_user(struct perf_regs *regs 63 void perf_get_regs_user(struct perf_regs *regs_user,
102 struct pt_regs *regs) 64 struct pt_regs *regs)
103 { 65 {
104 regs_user->regs = task_pt_regs(current 66 regs_user->regs = task_pt_regs(current);
105 regs_user->abi = perf_reg_abi(current) 67 regs_user->abi = perf_reg_abi(current);
106 } 68 }
107 69
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