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