add xenomai

hc

2024-11-01 2f529f9b558ca1c1bd74be7437a84e4711743404

 kernel/arch/arm64/kernel/syscall.c
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@@ -2,6 +2,7 @@
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 #include <linux/compiler.h>
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 #include <linux/context_tracking.h>
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+#include <linux/irqstage.h>
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 #include <linux/errno.h>
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 #include <linux/nospec.h>
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 #include <linux/ptrace.h>
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@@ -94,6 +95,7 @@
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 			   const syscall_fn_t syscall_table[])
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 {
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 	unsigned long flags = current_thread_info()->flags;
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+	int ret;
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 	regs->orig_x0 = regs->regs[0];
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 	regs->syscallno = scno;
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@@ -117,9 +119,18 @@
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 	 */
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 	cortex_a76_erratum_1463225_svc_handler();
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+	WARN_ON_ONCE(dovetail_debug() &&
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+		     running_inband() && test_inband_stall());
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 	local_daif_restore(DAIF_PROCCTX);
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-	if (flags & _TIF_MTE_ASYNC_FAULT) {
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+	ret = pipeline_syscall(scno, regs);
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+	if (ret > 0)
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+		return;
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+
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+	if (ret < 0)
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+		goto tail_work;
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+
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+	if (system_supports_mte() && (flags & _TIF_MTE_ASYNC_FAULT)) {
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 		/*
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 		 * Process the asynchronous tag check fault before the actual
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 		 * syscall. do_notify_resume() will send a signal to userspace
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@@ -159,11 +170,16 @@
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 	 * check again. However, if we were tracing entry, then we always trace
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 	 * exit regardless, as the old entry assembly did.
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 	 */
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+tail_work:
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 	if (!has_syscall_work(flags) && !IS_ENABLED(CONFIG_DEBUG_RSEQ)) {
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 		local_daif_mask();
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+		stall_inband();
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 		flags = current_thread_info()->flags;
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-		if (!has_syscall_work(flags) && !(flags & _TIF_SINGLESTEP))
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+		if (!has_syscall_work(flags) && !(flags & _TIF_SINGLESTEP)) {
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+			unstall_inband();
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 			return;
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+		}
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+		unstall_inband();
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 		local_daif_restore(DAIF_PROCCTX);
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 	}
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