perf_regs.c

 1// SPDX-License-Identifier: GPL-2.0
 2
 3/* Copyright (C) 2025 by Helge Deller <deller@gmx.de> */
 4
 5#include <linux/perf_event.h>
 6#include <linux/perf_regs.h>
 7#include <asm/ptrace.h>
 8
 9u64 perf_reg_value(struct pt_regs *regs, int idx)
10{
11	switch (idx) {
12	case PERF_REG_PARISC_R0 ... PERF_REG_PARISC_R31:
13		return regs->gr[idx - PERF_REG_PARISC_R0];
14	case PERF_REG_PARISC_SR0 ... PERF_REG_PARISC_SR7:
15		return regs->sr[idx - PERF_REG_PARISC_SR0];
16	case PERF_REG_PARISC_IASQ0 ... PERF_REG_PARISC_IASQ1:
17		return regs->iasq[idx - PERF_REG_PARISC_IASQ0];
18	case PERF_REG_PARISC_IAOQ0 ... PERF_REG_PARISC_IAOQ1:
19		return regs->iasq[idx - PERF_REG_PARISC_IAOQ0];
20	case PERF_REG_PARISC_SAR:	/* CR11 */
21		return regs->sar;
22	case PERF_REG_PARISC_IIR:	/* CR19 */
23		return regs->iir;
24	case PERF_REG_PARISC_ISR:	/* CR20 */
25		return regs->isr;
26	case PERF_REG_PARISC_IOR:	/* CR21 */
27		return regs->ior;
28	case PERF_REG_PARISC_IPSW:	/* CR22 */
29		return regs->ipsw;
30	}
31	WARN_ON_ONCE((u32)idx >= PERF_REG_PARISC_MAX);
32	return 0;
33}
34
35#define REG_RESERVED (~((1ULL << PERF_REG_PARISC_MAX) - 1))
36
37int perf_reg_validate(u64 mask)
38{
39	if (!mask || mask & REG_RESERVED)
40		return -EINVAL;
41
42	return 0;
43}
44
45u64 perf_reg_abi(struct task_struct *task)
46{
47	if (!IS_ENABLED(CONFIG_64BIT))
48		return PERF_SAMPLE_REGS_ABI_32;
49
50	if (test_tsk_thread_flag(task, TIF_32BIT))
51		return PERF_SAMPLE_REGS_ABI_32;
52
53	return PERF_SAMPLE_REGS_ABI_64;
54}
55
56void perf_get_regs_user(struct perf_regs *regs_user,
57			struct pt_regs *regs)
58{
59	regs_user->regs = task_pt_regs(current);
60	regs_user->abi = perf_reg_abi(current);
61}