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| 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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