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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 */
1#ifndef _ASM_POWERPC_PROBES_H
2#define _ASM_POWERPC_PROBES_H
3#ifdef __KERNEL__
4/*
5 * Definitions common to probes files
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 *
21 * Copyright IBM Corporation, 2012
22 */
23#include <linux/types.h>
24
25typedef u32 ppc_opcode_t;
26#define BREAKPOINT_INSTRUCTION 0x7fe00008 /* trap */
27
28/* Trap definitions per ISA */
29#define IS_TW(instr) (((instr) & 0xfc0007fe) == 0x7c000008)
30#define IS_TD(instr) (((instr) & 0xfc0007fe) == 0x7c000088)
31#define IS_TDI(instr) (((instr) & 0xfc000000) == 0x08000000)
32#define IS_TWI(instr) (((instr) & 0xfc000000) == 0x0c000000)
33
34#ifdef CONFIG_PPC64
35#define is_trap(instr) (IS_TW(instr) || IS_TD(instr) || \
36 IS_TWI(instr) || IS_TDI(instr))
37#else
38#define is_trap(instr) (IS_TW(instr) || IS_TWI(instr))
39#endif /* CONFIG_PPC64 */
40
41#ifdef CONFIG_PPC_ADV_DEBUG_REGS
42#define MSR_SINGLESTEP (MSR_DE)
43#else
44#define MSR_SINGLESTEP (MSR_SE)
45#endif
46
47/* Enable single stepping for the current task */
48static inline void enable_single_step(struct pt_regs *regs)
49{
50 regs->msr |= MSR_SINGLESTEP;
51#ifdef CONFIG_PPC_ADV_DEBUG_REGS
52 /*
53 * We turn off Critical Input Exception(CE) to ensure that the single
54 * step will be for the instruction we have the probe on; if we don't,
55 * it is possible we'd get the single step reported for CE.
56 */
57 regs->msr &= ~MSR_CE;
58 mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM);
59#ifdef CONFIG_PPC_47x
60 isync();
61#endif
62#endif
63}
64
65
66#endif /* __KERNEL__ */
67#endif /* _ASM_POWERPC_PROBES_H */