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9097087147
The syscall emulation code previously wasn't interruptible via cpu_loop_exit(), as this construct relies on a longjmp target that is not live anymore in the syscall handling code. Consequently, longjmp() would operate on a (potentially overwritten) stale jump buffer. This patch adds an additional setjmp and the necessary handling around it to make longjmp() (and by proxy cpu_loop_exit() safe to call even within a syscall context. Reviewed-by: Warner Losh <imp@bsdimp.com> Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Florian Hofhammer <florian.hofhammer@epfl.ch> Link: https://lore.kernel.org/qemu-devel/20260305-setpc-v5-v7-3-4c3adba52403@epfl.ch Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
41 lines
1.1 KiB
C
41 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* QEMU internal errno values for implementing user-only POSIX.
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*
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* Copyright (c) 2003 Fabrice Bellard
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* Copyright (c) 2021 Linaro, Ltd.
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*/
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#ifndef SPECIAL_ERRNO_H
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#define SPECIAL_ERRNO_H
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/*
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* All of these are QEMU internal, not visible to the guest.
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* They should be chosen so as to not overlap with any host
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* or guest errno.
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*/
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/*
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* This is returned when a system call should be restarted, to tell the
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* main loop that it should wind the guest PC backwards so it will
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* re-execute the syscall after handling any pending signals.
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*/
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#define QEMU_ERESTARTSYS 512
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/*
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* This is returned 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.
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*/
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#define QEMU_ESIGRETURN 513
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/*
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* This is returned after a plugin has used the qemu_plugin_set_pc API, to
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* indicate that the plugin deliberately changed the PC and potentially
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* modified the register values. The main loop should not touch the guest
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* registers for this reason.
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*/
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#define QEMU_ESETPC 514
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#endif /* SPECIAL_ERRNO_H */
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