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 25 typedef 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 */ 48 static 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