1 /* SPDX-License-Identifier: GPL-2.0-or-later * 1
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()
15
16 /* Trap definitions per ISA */
17 #define IS_TW(instr) (((instr) & 0x
18 #define IS_TD(instr) (((instr) & 0x
19 #define IS_TDI(instr) (((instr) & 0x
20 #define IS_TWI(instr) (((instr) & 0x
21
22 #ifdef CONFIG_PPC64
23 #define is_trap(instr) (IS_TW(instr)
24 IS_TWI(instr)
25 #else
26 #define is_trap(instr) (IS_TW(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
35 static 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:
44 case OP_19_XOP_RFMCI:
45 case OP_19_XOP_RFDI:
46 case OP_19_XOP_RFI:
47 case OP_19_XOP_RFCI:
48 case OP_19_XOP_RFSCV:
49 case OP_19_XOP_HRFID:
50 case OP_19_XOP_URFID:
51 case OP_19_XOP_STOP:
52 case OP_19_XOP_DOZE:
53 case OP_19_XOP_NAP:
54 case OP_19_XOP_SLEEP:
55 case OP_19_XOP_RVWINKLE:
56 }
57 break;
58 case OP_31:
59 switch (get_xop(inst)) {
60 case OP_31_XOP_TRAP:
61 case OP_31_XOP_TRAP_64:
62 case OP_31_XOP_MTMSR:
63 case OP_31_XOP_MTMSRD:
64 }
65 break;
66 }
67 return true;
68 }
69
70 /* Enable single stepping for the current task
71 static inline void enable_single_step(struct p
72 {
73 regs_set_return_msr(regs, regs->msr |
74 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
75 /*
76 * We turn off Critical Input Exceptio
77 * step will be for the instruction we
78 * it is possible we'd get the single
79 */
80 regs_set_return_msr(regs, regs->msr &
81 mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) |
82 #ifdef CONFIG_PPC_47x
83 isync();
84 #endif
85 #endif
86 }
87
88
89 #endif /* __KERNEL__ */
90 #endif /* _ASM_POWERPC_PROBES_H */
91
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