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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>
master
Timothy E Baldwin 2016-05-12 18:47:29 +01:00 committed by Riku Voipio
parent 14896d3281
commit 499b5d176a
4 changed files with 9 additions and 10 deletions
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9
linux-user/errno_defs.h
View File

@ -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 */

4
linux-user/mips/target_syscall.h
View File

@ -222,10 +222,6 @@ struct target_pt_regs {
#define TARGET_ENOTRECOVERABLE 166 /* State not recoverable */
/* Nasty hack: define a fake errno value for use by sigreturn. */
#define TARGET_QEMU_ESIGRETURN 255
#define UNAME_MACHINE "mips"
#define UNAME_MINIMUM_RELEASE "2.6.32"

4
linux-user/mips64/target_syscall.h
View File

@ -219,10 +219,6 @@ struct target_pt_regs {
#define TARGET_ENOTRECOVERABLE 166 /* State not recoverable */
/* Nasty hack: define a fake errno value for use by sigreturn. */
#define TARGET_QEMU_ESIGRETURN 255
#define UNAME_MACHINE "mips64"
#define UNAME_MINIMUM_RELEASE "2.6.32"

2
linux-user/ppc/target_syscall.h
View File

@ -53,8 +53,6 @@ struct target_revectored_struct {
abi_ulong __map[8]; /* 256 bits */
};
/* Nasty hack: define a fake errno value for use by sigreturn. */
#define TARGET_QEMU_ESIGRETURN 255
/*
* flags masks