add xenomai

hc

2024-11-01 2f529f9b558ca1c1bd74be7437a84e4711743404

 kernel/arch/x86/entry/common.c
..
..
@@ -40,6 +40,15 @@
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 {
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 	nr = syscall_enter_from_user_mode(regs, nr);
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42
 
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+	if (dovetailing()) {
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+		if (nr == EXIT_SYSCALL_OOB) {
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+			hard_local_irq_disable();
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+			return;
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+		}
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+		if (nr == EXIT_SYSCALL_TAIL)
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+			goto done;
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+	}
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+
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 	instrumentation_begin();
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 	if (likely(nr < NR_syscalls)) {
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 		nr = array_index_nospec(nr, NR_syscalls);
..
..
@@ -53,6 +62,7 @@
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 #endif
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 	}
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 	instrumentation_end();
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+done:
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 	syscall_exit_to_user_mode(regs);
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 }
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 #endif
..
..
@@ -89,11 +99,22 @@
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 	 * or may not be necessary, but it matches the old asm behavior.
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 	 */
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 	nr = (unsigned int)syscall_enter_from_user_mode(regs, nr);
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+
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+	if (dovetailing()) {
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+		if (nr == EXIT_SYSCALL_OOB) {
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+			hard_local_irq_disable();
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+			return;
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+		}
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+		if (nr == EXIT_SYSCALL_TAIL)
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+			goto done;
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+	}
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+
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 	instrumentation_begin();
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 	do_syscall_32_irqs_on(regs, nr);
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115
 
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 	instrumentation_end();
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+done:
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 	syscall_exit_to_user_mode(regs);
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 }
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..
..
@@ -136,9 +157,20 @@
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 	/* The case truncates any ptrace induced syscall nr > 2^32 -1 */
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 	nr = (unsigned int)syscall_enter_from_user_mode_work(regs, nr);
138
159
 
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+	if (dovetailing()) {
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+		if (nr == EXIT_SYSCALL_OOB) {
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+			instrumentation_end();
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+			hard_local_irq_disable();
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+			return true;
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+		}
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+		if (nr == EXIT_SYSCALL_TAIL)
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+			goto done;
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+	}
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+
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 	/* Now this is just like a normal syscall. */
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 	do_syscall_32_irqs_on(regs, nr);
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172
 
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+done:
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 	instrumentation_end();
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 	syscall_exit_to_user_mode(regs);
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 	return true;