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[PATCH v5 11/17] bsd-user: Create special-errno.h
From: |
Richard Henderson |
Subject: |
[PATCH v5 11/17] bsd-user: Create special-errno.h |
Date: |
Wed, 17 Nov 2021 17:04:06 +0100 |
Pull the internal errno used by qemu internally its own
header file, for use by safe-syscall.S.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
bsd-user/errno_defs.h | 6 +++++-
bsd-user/special-errno.h | 24 ++++++++++++++++++++++++
2 files changed, 29 insertions(+), 1 deletion(-)
create mode 100644 bsd-user/special-errno.h
diff --git a/bsd-user/errno_defs.h b/bsd-user/errno_defs.h
index 583ebe8cee..73cfa24b7f 100644
--- a/bsd-user/errno_defs.h
+++ b/bsd-user/errno_defs.h
@@ -151,6 +151,10 @@
/* Internal errors: */
#define TARGET_EJUSTRETURN 254 /* Just return without
modifing regs */
#define TARGET_ERESTART 255 /* Restart syscall */
-#define QEMU_ERESTARTSYS TARGET_ERESTART /* compat */
+
+#include "special-errno.h"
+
+_Static_assert(TARGET_ERESTART == QEMU_ERESTARTSYS,
+ "TARGET_ERESTART and QEMU_ERESTARTSYS expected to match");
#endif /* ! _ERRNO_DEFS_H_ */
diff --git a/bsd-user/special-errno.h b/bsd-user/special-errno.h
new file mode 100644
index 0000000000..03599d9b5a
--- /dev/null
+++ b/bsd-user/special-errno.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * QEMU internal errno values for implementing user-only POSIX.
+ *
+ * Copyright (c) 2021 Linaro, Ltd.
+ */
+
+#ifndef SPECIAL_ERRNO_H
+#define SPECIAL_ERRNO_H
+
+/*
+ * All of these are QEMU internal, not visible to the guest.
+ * They should be chosen so as to not overlap with any host
+ * or guest errno.
+ */
+
+/*
+ * This is returned when a system call should be restarted, to tell the
+ * main loop that it should wind the guest PC backwards so it will
+ * re-execute the syscall after handling any pending signals.
+ */
+#define QEMU_ERESTARTSYS 255
+
+#endif /* SPECIAL_ERRNO_H */
--
2.25.1
- Re: [PATCH v5 04/17] common-user: Move syscall error detection into safe_syscall_base, (continued)
[PATCH v5 07/17] linux-user: Remove HAVE_SAFE_SYSCALL and hostdep.h, Richard Henderson, 2021/11/17
[PATCH v5 08/17] common-user: Adjust system call return on FreeBSD, Richard Henderson, 2021/11/17
[PATCH v5 09/17] *-user: Rename TARGET_ERESTARTSYS to QEMU_ERESTARTSYS, Richard Henderson, 2021/11/17
[PATCH v5 11/17] bsd-user: Create special-errno.h,
Richard Henderson <=
[PATCH v5 12/17] linux-user: Create special-errno.h, Richard Henderson, 2021/11/17
[PATCH v5 14/17] common-user: Move safe-syscall.* from linux-user, Richard Henderson, 2021/11/17
[PATCH v5 10/17] linux-user: Rename TARGET_QEMU_ESIGRETURN to QEMU_ESIGRETURN, Richard Henderson, 2021/11/17
[PATCH v5 13/17] meson: Add build infrastructure for common-user, Richard Henderson, 2021/11/17
[PATCH v5 15/17] linux-user: Move thunk.c from top-level, Richard Henderson, 2021/11/17