1/* SPDX-License-Identifier: GPL-2.0-or-later */
2#ifndef _ASM_POWERPC_PROBES_H
3#define _ASM_POWERPC_PROBES_H
4#ifdef __KERNEL__
5/*
6 * Definitions common to probes files
7 *
8 * Copyright IBM Corporation, 2012
9 */
10#include <linux/types.h>
11#include <asm/disassemble.h>
12#include <asm/ppc-opcode.h>
13
14#define BREAKPOINT_INSTRUCTION	PPC_RAW_TRAP()	/* trap */
15
16/* Trap definitions per ISA */
17#define IS_TW(instr)		(((instr) & 0xfc0007fe) == 0x7c000008)
18#define IS_TD(instr)		(((instr) & 0xfc0007fe) == 0x7c000088)
19#define IS_TDI(instr)		(((instr) & 0xfc000000) == 0x08000000)
20#define IS_TWI(instr)		(((instr) & 0xfc000000) == 0x0c000000)
21
22#ifdef CONFIG_PPC64
23#define is_trap(instr)		(IS_TW(instr) || IS_TD(instr) || \
24				IS_TWI(instr) || IS_TDI(instr))
25#else
26#define is_trap(instr)		(IS_TW(instr) || IS_TWI(instr))
27#endif /* CONFIG_PPC64 */
28
29#ifdef CONFIG_PPC_ADV_DEBUG_REGS
30#define MSR_SINGLESTEP	(MSR_DE)
31#else
32#define MSR_SINGLESTEP	(MSR_SE)
33#endif
34
35static inline bool can_single_step(u32 inst)
36{
37	switch (get_op(inst)) {
38	case OP_TRAP_64:	return false;
39	case OP_TRAP:		return false;
40	case OP_SC:		return false;
41	case OP_19:
42		switch (get_xop(inst)) {
43		case OP_19_XOP_RFID:		return false;
44		case OP_19_XOP_RFMCI:		return false;
45		case OP_19_XOP_RFDI:		return false;
46		case OP_19_XOP_RFI:		return false;
47		case OP_19_XOP_RFCI:		return false;
48		case OP_19_XOP_RFSCV:		return false;
49		case OP_19_XOP_HRFID:		return false;
50		case OP_19_XOP_URFID:		return false;
51		case OP_19_XOP_STOP:		return false;
52		case OP_19_XOP_DOZE:		return false;
53		case OP_19_XOP_NAP:		return false;
54		case OP_19_XOP_SLEEP:		return false;
55		case OP_19_XOP_RVWINKLE:	return false;
56		}
57		break;
58	case OP_31:
59		switch (get_xop(inst)) {
60		case OP_31_XOP_TRAP:		return false;
61		case OP_31_XOP_TRAP_64:		return false;
62		case OP_31_XOP_MTMSR:		return false;
63		case OP_31_XOP_MTMSRD:		return false;
64		}
65		break;
66	}
67	return true;
68}
69
70/* Enable single stepping for the current task */
71static inline void enable_single_step(struct pt_regs *regs)
72{
73	regs_set_return_msr(regs, regs->msr | MSR_SINGLESTEP);
74#ifdef CONFIG_PPC_ADV_DEBUG_REGS
75	/*
76	 * We turn off Critical Input Exception(CE) to ensure that the single
77	 * step will be for the instruction we have the probe on; if we don't,
78	 * it is possible we'd get the single step reported for CE.
79	 */
80	regs_set_return_msr(regs, regs->msr & ~MSR_CE);
81	mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM);
82#ifdef CONFIG_PPC_47x
83	isync();
84#endif
85#endif
86}
87
88
89#endif /* __KERNEL__ */
90#endif	/* _ASM_POWERPC_PROBES_H */
91