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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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 * Copyright (C) 2015 Thomas Meyer ([email protected])
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 * Copyright (C) 2005 Jeff Dike ([email protected])
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 */
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#ifndef __STUB_DATA_H
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#define __STUB_DATA_H
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#include <linux/compiler_types.h>
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#include <as-layout.h>
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#include <sysdep/tls.h>
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#include <sysdep/stub-data.h>
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#include <mm_id.h>
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#define FUTEX_IN_CHILD 0
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#define FUTEX_IN_KERN 1
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struct stub_init_data {
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	int seccomp;
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	unsigned long stub_start;
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	int stub_code_fd;
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	unsigned long stub_code_offset;
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	int stub_data_fd;
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	unsigned long stub_data_offset;
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	unsigned long signal_handler;
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	unsigned long signal_restorer;
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};
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#define STUB_NEXT_SYSCALL(s) \
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	((struct stub_syscall *) (((unsigned long) s) + (s)->cmd_len))
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enum stub_syscall_type {
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	STUB_SYSCALL_UNSET = 0,
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	STUB_SYSCALL_MMAP,
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	STUB_SYSCALL_MUNMAP,
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};
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struct stub_syscall {
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	struct {
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		unsigned long addr;
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		unsigned long length;
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		unsigned long offset;
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		int fd;
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		int prot;
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	} mem;
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	enum stub_syscall_type syscall;
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};
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struct stub_data {
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	long err;
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	int syscall_data_len;
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	/* 128 leaves enough room for additional fields in the struct */
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	struct stub_syscall syscall_data[(UM_KERN_PAGE_SIZE - 128) / sizeof(struct stub_syscall)] __aligned(16);
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	/* data shared with signal handler (only used in seccomp mode) */
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	short restart_wait;
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	unsigned int futex;
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	int signal;
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	unsigned short si_offset;
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	unsigned short mctx_offset;
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	/* seccomp architecture specific state restore */
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	struct stub_data_arch arch_data;
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	/* Stack for our signal handlers and for calling into . */
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	unsigned char sigstack[UM_KERN_PAGE_SIZE] __aligned(UM_KERN_PAGE_SIZE);
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};
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#endif
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