/* 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 */