arch/loongarch/include/asm/kgdb.h

   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_ */