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It is desirable for signal handlers to be allowed to make use of MSA, particularly if auto vectorisation is used when compiling a program. The MSA context must therefore be saved & restored before & after invoking the signal handler. Make use of the extended context structs defined in the preceding patch to save MSA context after the sigframe when appropriate. [ralf@linux-mips.org: Fixed conflicts.] Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: linux-mips@linux-mips.org Cc: Guenter Roeck <linux@roeck-us.net> Cc: Matthew Fortune <matthew.fortune@imgtec.com> Cc: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> Cc: linux-kernel@vger.kernel.org Cc: Richard Weinberger <richard@nod.at> Cc: James Hogan <james.hogan@imgtec.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Markos Chandras <markos.chandras@imgtec.com> Cc: Manuel Lauss <manuel.lauss@gmail.com> Cc: Maciej W. Rozycki <macro@codesourcery.com> Patchwork: https://patchwork.linux-mips.org/patch/10796/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
43 lines
1.3 KiB
C
43 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, __func__, ##args)
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#else
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# define DEBUGP(fmt, args...)
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#endif
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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 ksignal *ksig, struct pt_regs *regs,
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size_t frame_size);
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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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#define lock_fpu_owner() ({ preempt_disable(); pagefault_disable(); })
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#define unlock_fpu_owner() ({ pagefault_enable(); preempt_enable(); })
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/* Assembly functions to move context to/from the FPU */
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extern asmlinkage int
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_save_fp_context(void __user *fpregs, void __user *csr);
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extern asmlinkage int
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_restore_fp_context(void __user *fpregs, void __user *csr);
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extern asmlinkage int _save_msa_all_upper(void __user *buf);
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extern asmlinkage int _restore_msa_all_upper(void __user *buf);
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#endif /* __SIGNAL_COMMON_H */
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