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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2023 Loongson Technology Corporation Limited
*/
#ifndef _ASM_LOONGARCH_KGDB_H
#define _ASM_LOONGARCH_KGDB_H
#define GDB_SIZEOF_REG sizeof(u64)
/* gdb remote procotol expects the following register layout. */
/*
* General purpose registers:
* r0-r31: 64 bit
* orig_a0: 64 bit
* pc : 64 bit
* csr_badvaddr: 64 bit
*/
#define DBG_PT_REGS_BASE 0
#define DBG_PT_REGS_NUM 35
#define DBG_PT_REGS_END (DBG_PT_REGS_BASE + DBG_PT_REGS_NUM - 1)
/*
* Floating point registers:
* f0-f31: 64 bit
*/
#define DBG_FPR_BASE (DBG_PT_REGS_END + 1)
#define DBG_FPR_NUM 32
#define DBG_FPR_END (DBG_FPR_BASE + DBG_FPR_NUM - 1)
/*
* Condition Flag registers:
* fcc0-fcc8: 8 bit
*/
#define DBG_FCC_BASE (DBG_FPR_END + 1)
#define DBG_FCC_NUM 8
#define DBG_FCC_END (DBG_FCC_BASE + DBG_FCC_NUM - 1)
/*
* Floating-point Control and Status registers:
* fcsr: 32 bit
*/
#define DBG_FCSR_NUM 1
#define DBG_FCSR (DBG_FCC_END + 1)
#define DBG_MAX_REG_NUM (DBG_FCSR + 1)
/*
* Size of I/O buffer for gdb packet.
* considering to hold all register contents, size is set
*/
#define BUFMAX 2048
/*
* Number of bytes required for gdb_regs buffer.
* PT_REGS and FPR: 8 bytes; FCSR: 4 bytes; FCC: 1 bytes.
* GDB fails to connect for size beyond this with error
* "'g' packet reply is too long"
*/
#define NUMREGBYTES ((DBG_PT_REGS_NUM + DBG_FPR_NUM) * GDB_SIZEOF_REG + DBG_FCC_NUM * 1 + DBG_FCSR_NUM * 4)
#define BREAK_INSTR_SIZE 4
#define CACHE_FLUSH_IS_SAFE 0
/* Register numbers of various important registers. */
enum dbg_loongarch_regnum {
DBG_LOONGARCH_ZERO = 0,
DBG_LOONGARCH_RA,
DBG_LOONGARCH_TP,
DBG_LOONGARCH_SP,
DBG_LOONGARCH_A0,
DBG_LOONGARCH_FP = 22,
DBG_LOONGARCH_S0,
DBG_LOONGARCH_S1,
DBG_LOONGARCH_S2,
DBG_LOONGARCH_S3,
DBG_LOONGARCH_S4,
DBG_LOONGARCH_S5,
DBG_LOONGARCH_S6,
DBG_LOONGARCH_S7,
DBG_LOONGARCH_S8,
DBG_LOONGARCH_ORIG_A0,
DBG_LOONGARCH_PC,
DBG_LOONGARCH_BADV
};
void kgdb_breakinst(void);
void arch_kgdb_breakpoint(void);
#ifdef CONFIG_KGDB
bool kgdb_breakpoint_handler(struct pt_regs *regs);
#else /* !CONFIG_KGDB */
static inline bool kgdb_breakpoint_handler(struct pt_regs *regs) { return false; }
#endif /* CONFIG_KGDB */
#endif /* __ASM_KGDB_H_ */
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