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-rw-r--r--arch/loongarch/include/asm/kgdb.h97
1 files changed, 97 insertions, 0 deletions
diff --git a/arch/loongarch/include/asm/kgdb.h b/arch/loongarch/include/asm/kgdb.h
new file mode 100644
index 0000000000..2041ae58b1
--- /dev/null
+++ b/arch/loongarch/include/asm/kgdb.h
@@ -0,0 +1,97 @@
+/* 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_ */