1*e14dd076SQing Zhang /* SPDX-License-Identifier: GPL-2.0 */
2*e14dd076SQing Zhang /*
3*e14dd076SQing Zhang * Copyright (C) 2023 Loongson Technology Corporation Limited
4*e14dd076SQing Zhang */
5*e14dd076SQing Zhang
6*e14dd076SQing Zhang #ifndef _ASM_LOONGARCH_KGDB_H
7*e14dd076SQing Zhang #define _ASM_LOONGARCH_KGDB_H
8*e14dd076SQing Zhang
9*e14dd076SQing Zhang #define GDB_SIZEOF_REG sizeof(u64)
10*e14dd076SQing Zhang
11*e14dd076SQing Zhang /* gdb remote procotol expects the following register layout. */
12*e14dd076SQing Zhang
13*e14dd076SQing Zhang /*
14*e14dd076SQing Zhang * General purpose registers:
15*e14dd076SQing Zhang * r0-r31: 64 bit
16*e14dd076SQing Zhang * orig_a0: 64 bit
17*e14dd076SQing Zhang * pc : 64 bit
18*e14dd076SQing Zhang * csr_badvaddr: 64 bit
19*e14dd076SQing Zhang */
20*e14dd076SQing Zhang #define DBG_PT_REGS_BASE 0
21*e14dd076SQing Zhang #define DBG_PT_REGS_NUM 35
22*e14dd076SQing Zhang #define DBG_PT_REGS_END (DBG_PT_REGS_BASE + DBG_PT_REGS_NUM - 1)
23*e14dd076SQing Zhang
24*e14dd076SQing Zhang /*
25*e14dd076SQing Zhang * Floating point registers:
26*e14dd076SQing Zhang * f0-f31: 64 bit
27*e14dd076SQing Zhang */
28*e14dd076SQing Zhang #define DBG_FPR_BASE (DBG_PT_REGS_END + 1)
29*e14dd076SQing Zhang #define DBG_FPR_NUM 32
30*e14dd076SQing Zhang #define DBG_FPR_END (DBG_FPR_BASE + DBG_FPR_NUM - 1)
31*e14dd076SQing Zhang
32*e14dd076SQing Zhang /*
33*e14dd076SQing Zhang * Condition Flag registers:
34*e14dd076SQing Zhang * fcc0-fcc8: 8 bit
35*e14dd076SQing Zhang */
36*e14dd076SQing Zhang #define DBG_FCC_BASE (DBG_FPR_END + 1)
37*e14dd076SQing Zhang #define DBG_FCC_NUM 8
38*e14dd076SQing Zhang #define DBG_FCC_END (DBG_FCC_BASE + DBG_FCC_NUM - 1)
39*e14dd076SQing Zhang
40*e14dd076SQing Zhang /*
41*e14dd076SQing Zhang * Floating-point Control and Status registers:
42*e14dd076SQing Zhang * fcsr: 32 bit
43*e14dd076SQing Zhang */
44*e14dd076SQing Zhang #define DBG_FCSR_NUM 1
45*e14dd076SQing Zhang #define DBG_FCSR (DBG_FCC_END + 1)
46*e14dd076SQing Zhang
47*e14dd076SQing Zhang #define DBG_MAX_REG_NUM (DBG_FCSR + 1)
48*e14dd076SQing Zhang
49*e14dd076SQing Zhang /*
50*e14dd076SQing Zhang * Size of I/O buffer for gdb packet.
51*e14dd076SQing Zhang * considering to hold all register contents, size is set
52*e14dd076SQing Zhang */
53*e14dd076SQing Zhang #define BUFMAX 2048
54*e14dd076SQing Zhang
55*e14dd076SQing Zhang /*
56*e14dd076SQing Zhang * Number of bytes required for gdb_regs buffer.
57*e14dd076SQing Zhang * PT_REGS and FPR: 8 bytes; FCSR: 4 bytes; FCC: 1 bytes.
58*e14dd076SQing Zhang * GDB fails to connect for size beyond this with error
59*e14dd076SQing Zhang * "'g' packet reply is too long"
60*e14dd076SQing Zhang */
61*e14dd076SQing Zhang #define NUMREGBYTES ((DBG_PT_REGS_NUM + DBG_FPR_NUM) * GDB_SIZEOF_REG + DBG_FCC_NUM * 1 + DBG_FCSR_NUM * 4)
62*e14dd076SQing Zhang
63*e14dd076SQing Zhang #define BREAK_INSTR_SIZE 4
64*e14dd076SQing Zhang #define CACHE_FLUSH_IS_SAFE 0
65*e14dd076SQing Zhang
66*e14dd076SQing Zhang /* Register numbers of various important registers. */
67*e14dd076SQing Zhang enum dbg_loongarch_regnum {
68*e14dd076SQing Zhang DBG_LOONGARCH_ZERO = 0,
69*e14dd076SQing Zhang DBG_LOONGARCH_RA,
70*e14dd076SQing Zhang DBG_LOONGARCH_TP,
71*e14dd076SQing Zhang DBG_LOONGARCH_SP,
72*e14dd076SQing Zhang DBG_LOONGARCH_A0,
73*e14dd076SQing Zhang DBG_LOONGARCH_FP = 22,
74*e14dd076SQing Zhang DBG_LOONGARCH_S0,
75*e14dd076SQing Zhang DBG_LOONGARCH_S1,
76*e14dd076SQing Zhang DBG_LOONGARCH_S2,
77*e14dd076SQing Zhang DBG_LOONGARCH_S3,
78*e14dd076SQing Zhang DBG_LOONGARCH_S4,
79*e14dd076SQing Zhang DBG_LOONGARCH_S5,
80*e14dd076SQing Zhang DBG_LOONGARCH_S6,
81*e14dd076SQing Zhang DBG_LOONGARCH_S7,
82*e14dd076SQing Zhang DBG_LOONGARCH_S8,
83*e14dd076SQing Zhang DBG_LOONGARCH_ORIG_A0,
84*e14dd076SQing Zhang DBG_LOONGARCH_PC,
85*e14dd076SQing Zhang DBG_LOONGARCH_BADV
86*e14dd076SQing Zhang };
87*e14dd076SQing Zhang
88*e14dd076SQing Zhang void kgdb_breakinst(void);
89*e14dd076SQing Zhang void arch_kgdb_breakpoint(void);
90*e14dd076SQing Zhang
91*e14dd076SQing Zhang #ifdef CONFIG_KGDB
92*e14dd076SQing Zhang bool kgdb_breakpoint_handler(struct pt_regs *regs);
93*e14dd076SQing Zhang #else /* !CONFIG_KGDB */
kgdb_breakpoint_handler(struct pt_regs * regs)94*e14dd076SQing Zhang static inline bool kgdb_breakpoint_handler(struct pt_regs *regs) { return false; }
95*e14dd076SQing Zhang #endif /* CONFIG_KGDB */
96*e14dd076SQing Zhang
97*e14dd076SQing Zhang #endif /* __ASM_KGDB_H_ */
98