add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/alpha/kernel/traps.c
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@@ -192,7 +192,7 @@
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 		local_irq_enable();
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 		while (1);
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 	}
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-	do_exit(SIGSEGV);
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+	make_task_dead(SIGSEGV);
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 }
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 #ifndef CONFIG_MATHEMU
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@@ -235,7 +235,21 @@
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 {
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 	int signo, code;
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-	if ((regs->ps & ~IPL_MAX) == 0) {
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+	if (type == 3) { /* FEN fault */
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+		/* Irritating users can call PAL_clrfen to disable the
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+		   FPU for the process.  The kernel will then trap in
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+		   do_switch_stack and undo_switch_stack when we try
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+		   to save and restore the FP registers.
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+
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+		   Given that GCC by default generates code that uses the
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+		   FP registers, PAL_clrfen is not useful except for DoS
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+		   attacks.  So turn the bleeding FPU back on and be done
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+		   with it.  */
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+		current_thread_info()->pcb.flags |= 1;
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+		__reload_thread(&current_thread_info()->pcb);
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+		return;
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+	}
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+	if (!user_mode(regs)) {
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 		if (type == 1) {
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 			const unsigned int *data
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 			  = (const unsigned int *) regs->pc;
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@@ -367,20 +381,6 @@
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 			}
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 		}
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 		break;
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-
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-	      case 3: /* FEN fault */
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-		/* Irritating users can call PAL_clrfen to disable the
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-		   FPU for the process.  The kernel will then trap in
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-		   do_switch_stack and undo_switch_stack when we try
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-		   to save and restore the FP registers.
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-
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-		   Given that GCC by default generates code that uses the
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-		   FP registers, PAL_clrfen is not useful except for DoS
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-		   attacks.  So turn the bleeding FPU back on and be done
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-		   with it.  */
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-		current_thread_info()->pcb.flags |= 1;
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-		__reload_thread(&current_thread_info()->pcb);
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-		return;
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 	      case 5: /* illoc */
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 	      default: /* unexpected instruction-fault type */
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@@ -577,7 +577,7 @@
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 	printk("Bad unaligned kernel access at %016lx: %p %lx %lu\n",
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 		pc, va, opcode, reg);
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-	do_exit(SIGSEGV);
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+	make_task_dead(SIGSEGV);
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 got_exception:
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 	/* Ok, we caught the exception, but we don't want it.  Is there
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@@ -632,7 +632,7 @@
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 		local_irq_enable();
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 		while (1);
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 	}
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-	do_exit(SIGSEGV);
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+	make_task_dead(SIGSEGV);
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 }
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 /*