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 12 typedef u32 ppc_opcode_t; 13 #define BREAKPOINT_INSTRUCTION 0x7fe00008 /* trap */ 14 15 /* Trap definitions per ISA */ 16 #define IS_TW(instr) (((instr) & 0xfc0007fe) == 0x7c000008) 17 #define IS_TD(instr) (((instr) & 0xfc0007fe) == 0x7c000088) 18 #define IS_TDI(instr) (((instr) & 0xfc000000) == 0x08000000) 19 #define IS_TWI(instr) (((instr) & 0xfc000000) == 0x0c000000) 20 21 #ifdef CONFIG_PPC64 22 #define is_trap(instr) (IS_TW(instr) || IS_TD(instr) || \ 23 IS_TWI(instr) || IS_TDI(instr)) 24 #else 25 #define is_trap(instr) (IS_TW(instr) || IS_TWI(instr)) 26 #endif /* CONFIG_PPC64 */ 27 28 #ifdef CONFIG_PPC_ADV_DEBUG_REGS 29 #define MSR_SINGLESTEP (MSR_DE) 30 #else 31 #define MSR_SINGLESTEP (MSR_SE) 32 #endif 33 34 /* Enable single stepping for the current task */ 35 static inline void enable_single_step(struct pt_regs *regs) 36 { 37 regs->msr |= MSR_SINGLESTEP; 38 #ifdef CONFIG_PPC_ADV_DEBUG_REGS 39 /* 40 * We turn off Critical Input Exception(CE) to ensure that the single 41 * step will be for the instruction we have the probe on; if we don't, 42 * it is possible we'd get the single step reported for CE. 43 */ 44 regs->msr &= ~MSR_CE; 45 mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM); 46 #ifdef CONFIG_PPC_47x 47 isync(); 48 #endif 49 #endif 50 } 51 52 53 #endif /* __KERNEL__ */ 54 #endif /* _ASM_POWERPC_PROBES_H */ 55