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 */
68