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.h>
9
10 u64 perf_reg_value(struct pt_regs *regs, int idx)
11 {
12 freg_t fp;
13
14 if (idx >= PERF_REG_S390_R0 && idx <= PERF_REG_S390_R15)
15 return regs->gprs[idx];
16
17 if (idx >= PERF_REG_S390_FP0 && idx <= PERF_REG_S390_FP15) {
18 if (!user_mode(regs))
19 return 0;
20
21 idx -= PERF_REG_S390_FP0;
22 fp = *(freg_t *)(current->thread.ufpu.vxrs + idx);
23 return fp.ui;
24 }
25
26 if (idx == PERF_REG_S390_MASK)
27 return regs->psw.mask;
28 if (idx == PERF_REG_S390_PC)
29 return regs->psw.addr;
30
31 WARN_ON_ONCE((u32)idx >= PERF_REG_S390_MAX);
32 return 0;
33 }
34
35 #define REG_RESERVED (~((1UL << PERF_REG_S390_MAX) - 1))
36
37 int perf_reg_validate(u64 mask)
38 {
39 if (!mask || mask & REG_RESERVED)
40 return -EINVAL;
41
42 return 0;
43 }
44
45 u64 perf_reg_abi(struct task_struct *task)
46 {
47 if (test_tsk_thread_flag(task, TIF_31BIT))
48 return PERF_SAMPLE_REGS_ABI_32;
49
50 return PERF_SAMPLE_REGS_ABI_64;
51 }
52
53 void perf_get_regs_user(struct perf_regs *regs_user,
54 struct pt_regs *regs)
55 {
56 /*
57 * Use the regs from the first interruption and let
58 * perf_sample_regs_intr() handle interrupts (regs == get_irq_regs()).
59 *
60 * Also save FPU registers for user-space tasks only.
61 */
62 regs_user->regs = task_pt_regs(current);
63 if (user_mode(regs_user->regs))
64 save_user_fpu_regs();
65 regs_user->abi = perf_reg_abi(current);
66 }
67
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