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/*
* Copyright (C) 1995-2009 Russell King
* Copyright (C) 2012 ARM Ltd.
* Copyright (C) 2017 Cavium Networks.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __ASM_SIGNAL_COMMON_H
#define __ASM_SIGNAL_COMMON_H
#include <linux/uaccess.h>
#include <asm/fpsimd.h>
#define EXTRA_CONTEXT_SIZE round_up(sizeof(struct extra_context), 16)
#define TERMINATOR_SIZE round_up(sizeof(struct _aarch64_ctx), 16)
/*
* Sanity limit on the approximate maximum size of signal frame we'll
* try to generate. Stack alignment padding and the frame record are
* not taken into account. This limit is not a guarantee and is
* NOT ABI.
*/
#define SIGFRAME_MAXSZ SZ_64K
#define parse_user_sigcontext(user, sf) \
__parse_user_sigcontext(user, &(sf)->uc.uc_mcontext, sf)
struct user_ctxs {
struct fpsimd_context __user *fpsimd;
struct sve_context __user *sve;
};
struct frame_record {
u64 fp;
u64 lr;
};
struct rt_sigframe_user_layout;
int setup_extra_context(char __user *sfp, unsigned long users, char __user *userp);
int __parse_user_sigcontext(struct user_ctxs *user,
struct sigcontext __user const *sc,
void __user const *sigframe_base);
int preserve_fpsimd_context(struct fpsimd_context __user *ctx);
int restore_fpsimd_context(struct fpsimd_context __user *ctx);
#ifdef CONFIG_ARM64_SVE
int preserve_sve_context(struct sve_context __user *ctx);
int restore_sve_fpsimd_context(struct user_ctxs *user);
#else /* ! CONFIG_ARM64_SVE */
/* Turn any non-optimised out attempts to use these into a link error: */
extern int preserve_sve_context(void __user *ctx);
extern int restore_sve_fpsimd_context(struct user_ctxs *user);
#endif /* ! CONFIG_ARM64_SVE */
#endif /* __ASM_SIGNAL_COMMON_H */
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