add new system file

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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/s390/kernel/traps.c
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@@ -45,21 +45,13 @@
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 void do_report_trap(struct pt_regs *regs, int si_signo, int si_code, char *str)
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 {
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 	if (user_mode(regs)) {
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-		force_sig_fault(si_signo, si_code, get_trap_ip(regs), current);
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+		force_sig_fault(si_signo, si_code, get_trap_ip(regs));
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 		report_user_fault(regs, si_signo, 0);
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         } else {
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                 const struct exception_table_entry *fixup;
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-		fixup = search_exception_tables(regs->psw.addr);
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-                if (fixup)
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-			regs->psw.addr = extable_fixup(fixup);
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-		else {
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-			enum bug_trap_type btt;
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-
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-			btt = report_bug(regs->psw.addr, regs);
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-			if (btt == BUG_TRAP_TYPE_WARN)
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-				return;
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+		fixup = s390_search_extables(regs->psw.addr);
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+		if (!fixup || !ex_handle(fixup, regs))
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 			die(regs, str);
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-		}
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         }
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 }
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..
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@@ -79,7 +71,7 @@
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 	if (!current->ptrace)
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 		return;
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 	force_sig_fault(SIGTRAP, TRAP_HWBKPT,
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-		(void __force __user *) current->thread.per_event.address, current);
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+		(void __force __user *) current->thread.per_event.address);
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 }
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 NOKPROBE_SYMBOL(do_per_trap);
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..
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@@ -165,7 +157,7 @@
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 			return;
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 		if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) {
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 			if (current->ptrace)
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-				force_sig_fault(SIGTRAP, TRAP_BRKPT, location, current);
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+				force_sig_fault(SIGTRAP, TRAP_BRKPT, location);
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 			else
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 				signal = SIGILL;
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 #ifdef CONFIG_UPROBES
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@@ -229,17 +221,11 @@
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 void data_exception(struct pt_regs *regs)
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 {
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-	int signal = 0;
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-
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 	save_fpu_regs();
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 	if (current->thread.fpu.fpc & FPC_DXC_MASK)
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-		signal = SIGFPE;
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-	else
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-		signal = SIGILL;
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-	if (signal == SIGFPE)
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 		do_fp_trap(regs, current->thread.fpu.fpc);
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-	else if (signal)
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-		do_trap(regs, signal, ILL_ILLOPN, "data exception");
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+	else
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+		do_trap(regs, SIGILL, ILL_ILLOPN, "data exception");
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 }
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 void space_switch_exception(struct pt_regs *regs)
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@@ -249,6 +235,27 @@
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 		regs->psw.mask |= PSW_ASC_HOME;
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 	/* Send SIGILL. */
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 	do_trap(regs, SIGILL, ILL_PRVOPC, "space switch event");
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+}
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+
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+void monitor_event_exception(struct pt_regs *regs)
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+{
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+	const struct exception_table_entry *fixup;
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+
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+	if (user_mode(regs))
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+		return;
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+
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+	switch (report_bug(regs->psw.addr - (regs->int_code >> 16), regs)) {
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+	case BUG_TRAP_TYPE_NONE:
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+		fixup = s390_search_extables(regs->psw.addr);
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+		if (fixup)
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+			ex_handle(fixup, regs);
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+		break;
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+	case BUG_TRAP_TYPE_WARN:
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+		break;
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+	case BUG_TRAP_TYPE_BUG:
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+		die(regs, "monitor event");
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+		break;
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+	}
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 }
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 void kernel_stack_overflow(struct pt_regs *regs)
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@@ -261,7 +268,25 @@
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 }
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 NOKPROBE_SYMBOL(kernel_stack_overflow);
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+static void __init test_monitor_call(void)
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+{
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+	int val = 1;
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+
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+	if (!IS_ENABLED(CONFIG_BUG))
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+		return;
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+	asm volatile(
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+		"	mc	0,0\n"
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+		"0:	xgr	%0,%0\n"
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+		"1:\n"
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+		EX_TABLE(0b,1b)
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+		: "+d" (val));
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+	if (!val)
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+		panic("Monitor call doesn't work!\n");
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+}
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+
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 void __init trap_init(void)
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 {
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+	sort_extable(__start_dma_ex_table, __stop_dma_ex_table);
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 	local_mcck_enable();
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+	test_monitor_call();
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 }