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 #include <asm/ppc-opcode.h>
13
14 #define BREAKPOINT_INSTRUCTION PPC_RAW_TRAP() /* 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
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: 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 */
71 static 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
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