/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _ASM_POWERPC_PROBES_H
#define _ASM_POWERPC_PROBES_H
#ifdef __KERNEL__
/*
 * Definitions common to probes files
 *
 * Copyright IBM Corporation, 2012
 */
#include <linux/types.h>
#include <asm/disassemble.h>
#include <asm/ppc-opcode.h>

#define BREAKPOINT_INSTRUCTION    PPC_RAW_TRAP()    /* trap */

/* Trap definitions per ISA */
#define IS_TW(instr)        (((instr) & 0xfc0007fe) == 0x7c000008)
#define IS_TD(instr)        (((instr) & 0xfc0007fe) == 0x7c000088)
#define IS_TDI(instr)        (((instr) & 0xfc000000) == 0x08000000)
#define IS_TWI(instr)        (((instr) & 0xfc000000) == 0x0c000000)

#ifdef CONFIG_PPC64
#define is_trap(instr)        (IS_TW(instr) || IS_TD(instr) || \
                IS_TWI(instr) || IS_TDI(instr))
#else
#define is_trap(instr)        (IS_TW(instr) || IS_TWI(instr))
#endif /* CONFIG_PPC64 */

#ifdef CONFIG_PPC_ADV_DEBUG_REGS
#define MSR_SINGLESTEP    (MSR_DE)
#else
#define MSR_SINGLESTEP    (MSR_SE)
#endif

static inline bool can_single_step(u32 inst)
{
    switch (get_op(inst)) {
    case OP_TRAP_64:    return false;
    case OP_TRAP:        return false;
    case OP_SC:        return false;
    case OP_19:
        switch (get_xop(inst)) {
        case OP_19_XOP_RFID:        return false;
        case OP_19_XOP_RFMCI:        return false;
        case OP_19_XOP_RFDI:        return false;
        case OP_19_XOP_RFI:        return false;
        case OP_19_XOP_RFCI:        return false;
        case OP_19_XOP_RFSCV:        return false;
        case OP_19_XOP_HRFID:        return false;
        case OP_19_XOP_URFID:        return false;
        case OP_19_XOP_STOP:        return false;
        case OP_19_XOP_DOZE:        return false;
        case OP_19_XOP_NAP:        return false;
        case OP_19_XOP_SLEEP:        return false;
        case OP_19_XOP_RVWINKLE:    return false;
        }
        break;
    case OP_31:
        switch (get_xop(inst)) {
        case OP_31_XOP_TRAP:        return false;
        case OP_31_XOP_TRAP_64:        return false;
        case OP_31_XOP_MTMSR:        return false;
        case OP_31_XOP_MTMSRD:        return false;
        }
        break;
    }
    return true;
}

/* Enable single stepping for the current task */
static inline void enable_single_step(struct pt_regs *regs)
{
    regs_set_return_msr(regs, regs->msr | MSR_SINGLESTEP);
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
    /*
     * We turn off Critical Input Exception(CE) to ensure that the single
     * step will be for the instruction we have the probe on; if we don't,
     * it is possible we'd get the single step reported for CE.
     */
    regs_set_return_msr(regs, regs->msr & ~MSR_CE);
    mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM);
#ifdef CONFIG_PPC_47x
    isync();
#endif
#endif
}


#endif /* __KERNEL__ */
#endif    /* _ASM_POWERPC_PROBES_H */