add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/mips/kernel/kgdb.c
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@@ -208,23 +208,16 @@
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 		".set\treorder");
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 }
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-static void kgdb_call_nmi_hook(void *ignored)
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+void kgdb_call_nmi_hook(void *ignored)
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 {
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 	mm_segment_t old_fs;
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 	old_fs = get_fs();
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-	set_fs(get_ds());
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+	set_fs(KERNEL_DS);
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 	kgdb_nmicallback(raw_smp_processor_id(), get_irq_regs());
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 	set_fs(old_fs);
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-}
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-
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-void kgdb_roundup_cpus(unsigned long flags)
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-{
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-	local_irq_enable();
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-	smp_call_function(kgdb_call_nmi_hook, NULL, 0);
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-	local_irq_disable();
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 }
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 static int compute_signal(int tt)
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@@ -326,7 +319,7 @@
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 	/* Kernel mode. Set correct address limit */
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 	old_fs = get_fs();
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-	set_fs(get_ds());
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+	set_fs(KERNEL_DS);
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 	if (atomic_read(&kgdb_active) != -1)
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 		kgdb_nmicallback(smp_processor_id(), regs);
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@@ -395,18 +388,16 @@
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 	return -1;
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 }
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-struct kgdb_arch arch_kgdb_ops;
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+const struct kgdb_arch arch_kgdb_ops = {
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+#ifdef CONFIG_CPU_BIG_ENDIAN
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+	.gdb_bpt_instr = { spec_op << 2, 0x00, 0x00, break_op },
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+#else
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+	.gdb_bpt_instr = { break_op, 0x00, 0x00, spec_op << 2 },
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+#endif
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+};
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 int kgdb_arch_init(void)
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 {
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-	union mips_instruction insn = {
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-		.r_format = {
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-			.opcode = spec_op,
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-			.func	= break_op,
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-		}
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-	};
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-	memcpy(arch_kgdb_ops.gdb_bpt_instr, insn.byte, BREAK_INSTR_SIZE);
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-
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 	register_die_notifier(&kgdb_notifier);
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 	return 0;