// SPDX-License-Identifier: GPL-2.0

/* Copyright (C) 2025 by Helge Deller <deller@gmx.de> */

#include <linux/perf_event.h>
#include <linux/perf_regs.h>
#include <asm/ptrace.h>

u64 perf_reg_value(struct pt_regs *regs, int idx)
{
        switch (idx) {
        case PERF_REG_PARISC_R0 ... PERF_REG_PARISC_R31:
                return regs->gr[idx - PERF_REG_PARISC_R0];
        case PERF_REG_PARISC_SR0 ... PERF_REG_PARISC_SR7:
                return regs->sr[idx - PERF_REG_PARISC_SR0];
        case PERF_REG_PARISC_IASQ0 ... PERF_REG_PARISC_IASQ1:
                return regs->iasq[idx - PERF_REG_PARISC_IASQ0];
        case PERF_REG_PARISC_IAOQ0 ... PERF_REG_PARISC_IAOQ1:
                return regs->iasq[idx - PERF_REG_PARISC_IAOQ0];
        case PERF_REG_PARISC_SAR:       /* CR11 */
                return regs->sar;
        case PERF_REG_PARISC_IIR:       /* CR19 */
                return regs->iir;
        case PERF_REG_PARISC_ISR:       /* CR20 */
                return regs->isr;
        case PERF_REG_PARISC_IOR:       /* CR21 */
                return regs->ior;
        case PERF_REG_PARISC_IPSW:      /* CR22 */
                return regs->ipsw;
        }
        WARN_ON_ONCE((u32)idx >= PERF_REG_PARISC_MAX);
        return 0;
}

#define REG_RESERVED (~((1ULL << PERF_REG_PARISC_MAX) - 1))

int perf_reg_validate(u64 mask)
{
        if (!mask || mask & REG_RESERVED)
                return -EINVAL;

        return 0;
}

u64 perf_reg_abi(struct task_struct *task)
{
        if (!IS_ENABLED(CONFIG_64BIT))
                return PERF_SAMPLE_REGS_ABI_32;

        if (test_tsk_thread_flag(task, TIF_32BIT))
                return PERF_SAMPLE_REGS_ABI_32;

        return PERF_SAMPLE_REGS_ABI_64;
}

void perf_get_regs_user(struct perf_regs *regs_user,
                        struct pt_regs *regs)
{
        regs_user->regs = task_pt_regs(current);
        regs_user->abi = perf_reg_abi(current);
}