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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>
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@ -147,3 +147,12 @@
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* kernel uses for the same purpose.
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*/
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#define TARGET_ERESTARTSYS 512 /* Restart system call (if SA_RESTART) */
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/* QEMU internal, not visible to the guest. This is returned by the
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* do_sigreturn() code after a successful sigreturn syscall, to indicate
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* that it has correctly set the guest registers and so the main loop
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* should not touch them. We use the value the guest would use for
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* ERESTART_NOINTR (which is kernel internal) to guarantee that we won't
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* clash with a valid guest errno now or in the future.
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*/
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#define TARGET_QEMU_ESIGRETURN 513 /* Return from signal */
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@ -222,10 +222,6 @@ struct target_pt_regs {
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#define TARGET_ENOTRECOVERABLE 166 /* State not recoverable */
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/* Nasty hack: define a fake errno value for use by sigreturn. */
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#define TARGET_QEMU_ESIGRETURN 255
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#define UNAME_MACHINE "mips"
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#define UNAME_MINIMUM_RELEASE "2.6.32"
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@ -219,10 +219,6 @@ struct target_pt_regs {
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#define TARGET_ENOTRECOVERABLE 166 /* State not recoverable */
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/* Nasty hack: define a fake errno value for use by sigreturn. */
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#define TARGET_QEMU_ESIGRETURN 255
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#define UNAME_MACHINE "mips64"
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#define UNAME_MINIMUM_RELEASE "2.6.32"
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@ -53,8 +53,6 @@ struct target_revectored_struct {
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abi_ulong __map[8]; /* 256 bits */
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};
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/* Nasty hack: define a fake errno value for use by sigreturn. */
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#define TARGET_QEMU_ESIGRETURN 255
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/*
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* flags masks
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