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authorTimothy E Baldwin <T.E.Baldwin99@members.leeds.ac.uk>2016-05-12 18:47:29 +0100
committerRiku Voipio <riku.voipio@linaro.org>2016-05-27 14:49:49 +0300
commit499b5d176a77773cab5479264a3d5067176df21c (patch)
tree91254e17cb3e44cb33730e4e4e79c1ae288fae24 /linux-user/errno_defs.h
parent14896d32814c78ed5b97a22fbd9e5a6cddc2de80 (diff)
downloadqemu-499b5d176a77773cab5479264a3d5067176df21c.tar.gz
linux-user: Renumber TARGET_QEMU_ESIGRETURN, make it not arch-specific
Currently we define a QEMU-internal errno TARGET_QEMU_ESIGRETURN only on the MIPS and PPC targets; move this to errno_defs.h so it is available for all architectures, and renumber it to 513. We pick 513 because this is safe from future use as a system call return value: Linux uses it as ERESTART_NOINTR internally and never allows that errno to escape to userspace. Signed-off-by: Timothy Edward Baldwin <T.E.Baldwin99@members.leeds.ac.uk> Message-id: 1441497448-32489-4-git-send-email-T.E.Baldwin99@members.leeds.ac.uk [PMM: TARGET_ERESTARTSYS split out into preceding patch, add comment] Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Diffstat (limited to 'linux-user/errno_defs.h')
-rw-r--r--linux-user/errno_defs.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/linux-user/errno_defs.h b/linux-user/errno_defs.h
index b7a8c9ff95..65522c4516 100644
--- a/linux-user/errno_defs.h
+++ b/linux-user/errno_defs.h
@@ -147,3 +147,12 @@
* kernel uses for the same purpose.
*/
#define TARGET_ERESTARTSYS 512 /* Restart system call (if SA_RESTART) */
+
+/* QEMU internal, not visible to the guest. This is returned by the
+ * do_sigreturn() code after a successful sigreturn syscall, to indicate
+ * that it has correctly set the guest registers and so the main loop
+ * should not touch them. We use the value the guest would use for
+ * ERESTART_NOINTR (which is kernel internal) to guarantee that we won't
+ * clash with a valid guest errno now or in the future.
+ */
+#define TARGET_QEMU_ESIGRETURN 513 /* Return from signal */