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 13 typedef u32 ppc_opcode_t; 14 #define BREAKPOINT_INSTRUCTION 0x7fe00008 /* 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 can_single_step(u32 inst)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 */ enable_single_step(struct pt_regs * regs)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