1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright (C) 2023 Loongson Technology Corporation Limited
4 */
5
6 #ifndef _ASM_LOONGARCH_KGDB_H
7 #define _ASM_LOONGARCH_KGDB_H
8
9 #define GDB_SIZEOF_REG sizeof(u64)
10
11 /* gdb remote procotol expects the following register layout. */
12
13 /*
14 * General purpose registers:
15 * r0-r31: 64 bit
16 * orig_a0: 64 bit
17 * pc : 64 bit
18 * csr_badvaddr: 64 bit
19 */
20 #define DBG_PT_REGS_BASE 0
21 #define DBG_PT_REGS_NUM 35
22 #define DBG_PT_REGS_END (DBG_PT_REGS_BASE + DBG_PT_REGS_NUM - 1)
23
24 /*
25 * Floating point registers:
26 * f0-f31: 64 bit
27 */
28 #define DBG_FPR_BASE (DBG_PT_REGS_END + 1)
29 #define DBG_FPR_NUM 32
30 #define DBG_FPR_END (DBG_FPR_BASE + DBG_FPR_NUM - 1)
31
32 /*
33 * Condition Flag registers:
34 * fcc0-fcc8: 8 bit
35 */
36 #define DBG_FCC_BASE (DBG_FPR_END + 1)
37 #define DBG_FCC_NUM 8
38 #define DBG_FCC_END (DBG_FCC_BASE + DBG_FCC_NUM - 1)
39
40 /*
41 * Floating-point Control and Status registers:
42 * fcsr: 32 bit
43 */
44 #define DBG_FCSR_NUM 1
45 #define DBG_FCSR (DBG_FCC_END + 1)
46
47 #define DBG_MAX_REG_NUM (DBG_FCSR + 1)
48
49 /*
50 * Size of I/O buffer for gdb packet.
51 * considering to hold all register contents, size is set
52 */
53 #define BUFMAX 2048
54
55 /*
56 * Number of bytes required for gdb_regs buffer.
57 * PT_REGS and FPR: 8 bytes; FCSR: 4 bytes; FCC: 1 bytes.
58 * GDB fails to connect for size beyond this with error
59 * "'g' packet reply is too long"
60 */
61 #define NUMREGBYTES ((DBG_PT_REGS_NUM + DBG_FPR_NUM) * GDB_SIZEOF_REG + DBG_FCC_NUM * 1 + DBG_FCSR_NUM * 4)
62
63 #define BREAK_INSTR_SIZE 4
64 #define CACHE_FLUSH_IS_SAFE 0
65
66 /* Register numbers of various important registers. */
67 enum dbg_loongarch_regnum {
68 DBG_LOONGARCH_ZERO = 0,
69 DBG_LOONGARCH_RA,
70 DBG_LOONGARCH_TP,
71 DBG_LOONGARCH_SP,
72 DBG_LOONGARCH_A0,
73 DBG_LOONGARCH_FP = 22,
74 DBG_LOONGARCH_S0,
75 DBG_LOONGARCH_S1,
76 DBG_LOONGARCH_S2,
77 DBG_LOONGARCH_S3,
78 DBG_LOONGARCH_S4,
79 DBG_LOONGARCH_S5,
80 DBG_LOONGARCH_S6,
81 DBG_LOONGARCH_S7,
82 DBG_LOONGARCH_S8,
83 DBG_LOONGARCH_ORIG_A0,
84 DBG_LOONGARCH_PC,
85 DBG_LOONGARCH_BADV
86 };
87
88 void kgdb_breakinst(void);
89 void arch_kgdb_breakpoint(void);
90
91 #ifdef CONFIG_KGDB
92 bool kgdb_breakpoint_handler(struct pt_regs *regs);
93 #else /* !CONFIG_KGDB */
94 static inline bool kgdb_breakpoint_handler(struct pt_regs *regs) { return false; }
95 #endif /* CONFIG_KGDB */
96
97 #endif /* __ASM_KGDB_H_ */
98
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