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With commit27267655c5("openrisc: Support floating point user api") I added an entry to the struct sigcontext which caused an unwanted change to the userspace ABI. To fix this we use the previously unused oldmask field space for the floating point fpcsr state. We do this with a union to restore the ABI back to the pre kernel v6.4 ABI and keep API compatibility. This does mean if there is some code somewhere that is setting oldmask in an OpenRISC specific userspace sighandler it would end up setting the floating point register status, but I think it's unlikely as oldmask was never functional before. Fixes:27267655c5("openrisc: Support floating point user api") Reported-by: Szabolcs Nagy <nsz@port70.net> Closes: https://lore.kernel.org/openrisc/20230626213840.GA1236108@port70.net/ Signed-off-by: Stafford Horne <shorne@gmail.com>
37 lines
1.1 KiB
C
37 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
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/*
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* OpenRISC Linux
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*
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* Linux architectural port borrowing liberally from similar works of
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* others. All original copyrights apply as per the original source
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* declaration.
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*
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* OpenRISC implementation:
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* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
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* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
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* et al.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef __ASM_OPENRISC_SIGCONTEXT_H
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#define __ASM_OPENRISC_SIGCONTEXT_H
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#include <asm/ptrace.h>
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/* This struct is saved by setup_frame in signal.c, to keep the current
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context while a signal handler is executed. It's restored by sys_sigreturn.
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*/
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struct sigcontext {
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struct user_regs_struct regs; /* needs to be first */
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union {
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unsigned long fpcsr;
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unsigned long oldmask; /* unused */
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};
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};
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#endif /* __ASM_OPENRISC_SIGCONTEXT_H */
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