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faea623464
The save_fp_context()/restore_fp_context() might sleep on accessing user stack and therefore might lose FPU ownership in middle of them. If these function failed due to "in_atomic" test in do_page_fault, touch the sigcontext area in non-atomic context and retry these save/restore operation. This is a replacement of a (broken) fix which was titled "Allow CpU exception in kernel partially". Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright (C) 1994 - 2000 Ralf Baechle
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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*/
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#ifndef __SIGNAL_COMMON_H
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#define __SIGNAL_COMMON_H
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/* #define DEBUG_SIG */
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#ifdef DEBUG_SIG
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# define DEBUGP(fmt, args...) printk("%s: " fmt, __FUNCTION__ , ##args)
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#else
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# define DEBUGP(fmt, args...)
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#endif
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#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
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/*
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* Determine which stack to use..
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*/
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extern void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
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size_t frame_size);
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/*
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* install trampoline code to get back from the sig handler
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*/
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extern int install_sigtramp(unsigned int __user *tramp, unsigned int syscall);
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/* Check and clear pending FPU exceptions in saved CSR */
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extern int fpcsr_pending(unsigned int __user *fpcsr);
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/* Make sure we will not lose FPU ownership */
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#ifdef CONFIG_PREEMPT
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#define lock_fpu_owner() preempt_disable()
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#define unlock_fpu_owner() preempt_enable()
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#else
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#define lock_fpu_owner() pagefault_disable()
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#define unlock_fpu_owner() pagefault_enable()
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#endif
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#endif /* __SIGNAL_COMMON_H */
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