Merge remote-tracking branch 'regulator/for-5.15' into regulator-next
[linux-2.6-microblaze.git] / arch / s390 / kernel / perf_regs.c
1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/perf_event.h>
3 #include <linux/perf_regs.h>
4 #include <linux/kernel.h>
5 #include <linux/errno.h>
6 #include <linux/bug.h>
7 #include <asm/ptrace.h>
8 #include <asm/fpu/api.h>
9 #include <asm/fpu/types.h>
10
11 u64 perf_reg_value(struct pt_regs *regs, int idx)
12 {
13         freg_t fp;
14
15         if (idx >= PERF_REG_S390_R0 && idx <= PERF_REG_S390_R15)
16                 return regs->gprs[idx];
17
18         if (idx >= PERF_REG_S390_FP0 && idx <= PERF_REG_S390_FP15) {
19                 if (!user_mode(regs))
20                         return 0;
21
22                 idx -= PERF_REG_S390_FP0;
23                 fp = MACHINE_HAS_VX ? *(freg_t *)(current->thread.fpu.vxrs + idx)
24                                     : current->thread.fpu.fprs[idx];
25                 return fp.ui;
26         }
27
28         if (idx == PERF_REG_S390_MASK)
29                 return regs->psw.mask;
30         if (idx == PERF_REG_S390_PC)
31                 return regs->psw.addr;
32
33         WARN_ON_ONCE((u32)idx >= PERF_REG_S390_MAX);
34         return 0;
35 }
36
37 #define REG_RESERVED (~((1UL << PERF_REG_S390_MAX) - 1))
38
39 int perf_reg_validate(u64 mask)
40 {
41         if (!mask || mask & REG_RESERVED)
42                 return -EINVAL;
43
44         return 0;
45 }
46
47 u64 perf_reg_abi(struct task_struct *task)
48 {
49         if (test_tsk_thread_flag(task, TIF_31BIT))
50                 return PERF_SAMPLE_REGS_ABI_32;
51
52         return PERF_SAMPLE_REGS_ABI_64;
53 }
54
55 void perf_get_regs_user(struct perf_regs *regs_user,
56                         struct pt_regs *regs)
57 {
58         /*
59          * Use the regs from the first interruption and let
60          * perf_sample_regs_intr() handle interrupts (regs == get_irq_regs()).
61          *
62          * Also save FPU registers for user-space tasks only.
63          */
64         regs_user->regs = task_pt_regs(current);
65         if (user_mode(regs_user->regs))
66                 save_fpu_regs();
67         regs_user->abi = perf_reg_abi(current);
68 }