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/*	$OpenBSD: exec.h,v 1.24 2007/05/26 00:36:03 krw Exp $	*/
/*	$NetBSD: exec.h,v 1.59 1996/02/09 18:25:09 christos Exp $	*/

/*-
 * Copyright (c) 1994 Christopher G. Demetriou
 * Copyright (c) 1993 Theo de Raadt
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)exec.h	8.3 (Berkeley) 1/21/94
 */

#ifndef _SYS_EXEC_H_
#define _SYS_EXEC_H_

/*
 * The following structure is found at the top of the user stack of each
 * user process. The ps program uses it to locate argv and environment
 * strings. Programs that wish ps to display other information may modify
 * it; normally ps_argvstr points to argv[0], and ps_nargvstr is the same
 * as the program's argc. The fields ps_envstr and ps_nenvstr are the
 * equivalent for the environment.
 */
struct ps_strings {
	char	**ps_argvstr;	/* first of 0 or more argument strings */
	int	ps_nargvstr;	/* the number of argument strings */
	char	**ps_envstr;	/* first of 0 or more environment strings */
	int	ps_nenvstr;	/* the number of environment strings */
};

/*
 * Address of ps_strings structure (in user space).
 */
#ifdef MACHINE_STACK_GROWS_UP
#define	PS_STRINGS	((struct ps_strings *)(USRSTACK))
#else
#define	PS_STRINGS \
	((struct ps_strings *)(USRSTACK - sizeof(struct ps_strings)))
#endif

/*
 * Below the PS_STRINGS and sigtramp, we may require a gap on the stack
 * (used to copyin/copyout various emulation data structures).
 */
#define	STACKGAPLEN	(2*1024)	/* plenty enough for now */

#ifdef MACHINE_STACK_GROWS_UP
#define	STACKGAPBASE_UNALIGNED	\
	((caddr_t)PS_STRINGS + sizeof(struct ps_strings))
#else
#define	STACKGAPBASE_UNALIGNED	\
	((caddr_t)PS_STRINGS - STACKGAPLEN)
#endif
#define	STACKGAPBASE		\
	((caddr_t)ALIGN(STACKGAPBASE_UNALIGNED))

/*
 * the following structures allow execve() to put together processes
 * in a more extensible and cleaner way.
 *
 * the exec_package struct defines an executable being execve()'d.
 * it contains the header, the vmspace-building commands, the vnode
 * information, and the arguments associated with the newly-execve'd
 * process.
 *
 * the exec_vmcmd struct defines a command description to be used
 * in creating the new process's vmspace.
 */

struct proc;
struct exec_package;

typedef int (*exec_makecmds_fcn)(struct proc *, struct exec_package *);

struct execsw {
	u_int	es_hdrsz;		/* size of header for this format */
	exec_makecmds_fcn es_check;	/* function to check exec format */
	struct emul *es_emul;		/* emulation */
};

struct exec_vmcmd {
	int	(*ev_proc)(struct proc *p, struct exec_vmcmd *cmd);
				/* procedure to run for region of vmspace */
	u_long	ev_len;		/* length of the segment to map */
	u_long	ev_addr;	/* address in the vmspace to place it at */
	struct	vnode *ev_vp;	/* vnode pointer for the file w/the data */
	u_long	ev_offset;	/* offset in the file for the data */
	u_int	ev_prot;	/* protections for segment */
	int	ev_flags;
#define VMCMD_RELATIVE  0x0001  /* ev_addr is relative to base entry */
#define VMCMD_BASE      0x0002  /* marks a base entry */
};

#define	EXEC_DEFAULT_VMCMD_SETSIZE	8	/* # of cmds in set to start */

/* exec vmspace-creation command set; see below */
struct exec_vmcmd_set {
	u_int	evs_cnt;
	u_int	evs_used;
	struct	exec_vmcmd *evs_cmds;
	struct	exec_vmcmd evs_start[EXEC_DEFAULT_VMCMD_SETSIZE];
};

struct exec_package {
	char	*ep_name;		/* file's name */
	void	*ep_hdr;		/* file's exec header */
	u_int	ep_hdrlen;		/* length of ep_hdr */
	u_int	ep_hdrvalid;		/* bytes of ep_hdr that are valid */
	struct nameidata *ep_ndp;	/* namei data pointer for lookups */
	struct	exec_vmcmd_set ep_vmcmds;  /* vmcmds used to build vmspace */
	struct	vnode *ep_vp;		/* executable's vnode */
	struct	vattr *ep_vap;		/* executable's attributes */
	u_long	ep_taddr;		/* process's text address */
	u_long	ep_tsize;		/* size of process's text */
	u_long	ep_daddr;		/* process's data(+bss) address */
	u_long	ep_dsize;		/* size of process's data(+bss) */
	u_long	ep_maxsaddr;		/* proc's max stack addr ("top") */
	u_long	ep_minsaddr;		/* proc's min stack addr ("bottom") */
	u_long	ep_ssize;		/* size of process's stack */
	u_long	ep_entry;		/* process's entry point */
	u_int	ep_flags;		/* flags; see below. */
	char	**ep_fa;		/* a fake args vector for scripts */
	int	ep_fd;			/* a file descriptor we're holding */
	struct  emul *ep_emul;		/* os emulation */
	void	*ep_emul_arg;		/* emulation argument */
	void	*ep_emul_argp;		/* emulation argument pointer */
	char	*ep_interp;		/* name of interpreter if any */
	u_long	ep_interp_pos;		/* interpreter load position */
};
#define	EXEC_INDIR	0x0001		/* script handling already done */
#define	EXEC_HASFD	0x0002		/* holding a shell script */
#define	EXEC_HASARGL	0x0004		/* has fake args vector */
#define	EXEC_SKIPARG	0x0008		/* don't copy user-supplied argv[0] */
#define	EXEC_DESTR	0x0010		/* destructive ops performed */

#ifdef _KERNEL
/*
 * functions used either by execve() or the various cpu-dependent execve()
 * hooks.
 */
int	exec_makecmds(struct proc *, struct exec_package *);
int	exec_runcmds(struct proc *, struct exec_package *);
void	vmcmdset_extend(struct exec_vmcmd_set *);
void	kill_vmcmds(struct exec_vmcmd_set *evsp);
int	vmcmd_map_pagedvn(struct proc *, struct exec_vmcmd *);
int	vmcmd_map_readvn(struct proc *, struct exec_vmcmd *);
int	vmcmd_map_zero(struct proc *, struct exec_vmcmd *);
void	*copyargs(struct exec_package *,
				    struct ps_strings *,
				    void *, void *);
void	setregs(struct proc *, struct exec_package *,
				    u_long, register_t *);
int	check_exec(struct proc *, struct exec_package *);
int	exec_setup_stack(struct proc *, struct exec_package *);
int	exec_process_vmcmds(struct proc *, struct exec_package *);

#ifdef DEBUG
void	new_vmcmd(struct exec_vmcmd_set *evsp,
		    int (*proc)(struct proc *p, struct exec_vmcmd *),
		    u_long len, u_long addr, struct vnode *vp, u_long offset,
		    u_int prot, int flags);
#define	NEW_VMCMD(evsp,proc,len,addr,vp,offset,prot) \
	new_vmcmd(evsp,proc,len,addr,vp,offset,prot, 0);
#define NEW_VMCMD2(evsp,proc,len,addr,vp,offset,prot,flags) \
	new_vmcmd(evsp,proc,len,addr,vp,offset,prot,flags)
#else	/* DEBUG */
#define NEW_VMCMD(evsp,proc,len,addr,vp,offset,prot) \
	NEW_VMCMD2(evsp,proc,len,addr,vp,offset,prot,0)
#define	NEW_VMCMD2(evsp,proc,len,addr,vp,offset,prot,flags) do { \
	struct exec_vmcmd *vcp; \
	if ((evsp)->evs_used >= (evsp)->evs_cnt) \
		vmcmdset_extend(evsp); \
	vcp = &(evsp)->evs_cmds[(evsp)->evs_used++]; \
	vcp->ev_proc = (proc); \
	vcp->ev_len = (len); \
	vcp->ev_addr = (addr); \
	if ((vcp->ev_vp = (vp)) != NULLVP) \
		VREF(vp); \
	vcp->ev_offset = (offset); \
	vcp->ev_prot = (prot); \
	vcp->ev_flags = (flags); \
} while (0)

#endif /* DEBUG */

/* Initialize an empty vmcmd set */
#define VMCMDSET_INIT(vmc) do { \
	(vmc)->evs_cnt = EXEC_DEFAULT_VMCMD_SETSIZE; \
	(vmc)->evs_cmds = (vmc)->evs_start; \
	(vmc)->evs_used = 0; \
} while (0)	

/*
 * Exec function switch:
 *
 * Note that each makecmds function is responsible for loading the
 * exec package with the necessary functions for any exec-type-specific
 * handling.
 *
 * Functions for specific exec types should be defined in their own
 * header file.
 */
extern struct	execsw execsw[];
extern int	nexecs;
extern int	exec_maxhdrsz;

#endif /* _KERNEL */

#include <sys/exec_aout.h>
#include <machine/exec.h>

#endif /* !_SYS_EXEC_H_ */