/*
 * Copyright (c) 1986 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef _SYS_EXEC_H_
#define _SYS_EXEC_H_
#ifdef KERNEL

#ifdef EXEC_SCRIPT
#define	SHSIZE	64
#define	SHPATHLEN 64
#endif
#ifdef EXEC_ELF
#define	STRLEN	32
#endif
#ifdef EXEC_AOUT
#include "exec_aout.h"
#endif
#ifdef EXEC_ELF
#include "exec_elf.h"
#endif

#define NO_ADDR	((caddr_t)(~0U)) /* Indicates addr. not yet filled in */

struct memsect {
	caddr_t vaddr;
	unsigned len;
};

struct exec_params {
	char *userfname;			/* The arguments to the exec() call */
	char **userargp;
	char **userenvp;
	union {
#ifdef EXEC_SCRIPT
		char sh[SHSIZE];
#endif
#ifdef EXEC_AOUT
		struct exec aout;
#endif
#ifdef EXEC_ELF
		struct elf_ehdr elf;
#endif
	} hdr;				/* head of file to exec */
	int hdr_len;			/* number of bytes valid in image_header */
	char **argp, **envp;
	u_short argc, envc;			/* count of argument and environment strings */
	u_short argbc, envbc;		/* total number of chars in argc and envc string pool */
	union {
#ifdef EXEC_SCRIPT
		struct {
			char interpname[20];		/* real name of the script interpreter */
			char interparg[SHPATHLEN];	/* interpreter arg */
			char interpreted;		/* flag - this executable is interpreted */
		} sh;
#endif
#ifdef EXEC_ELF
		struct {
			struct buf *stbp;		/* String table buffer pointer */
			int stbpos;			/* String table pos in buffer */
			int stsize;			/* String table size */
			int stoffset;			/* String table file pos */
			char str[STRLEN];
		} elf;
#endif
#ifdef EXEC_AOUT
		struct {
		} aout;
#endif
	};

	gid_t gid;
	uid_t uid;
#define	MAXALLOCBUF	6
	struct {
		struct buf *bp;			/* Memory allocator buffer */
		u_short fill;			/* Memory allocator "free" pointer */
	} alloc[MAXALLOCBUF];
	u_long ep_taddr, ep_tsize, ep_daddr, ep_dsize;
	struct inode *ip;		/* executable file ip */
	struct memsect text, data, bss, heap, stack;
};

struct execsw {
	int (*es_check)(struct exec_params *epp);
	const char* es_name;
};
extern const struct execsw execsw[];
extern int nexecs, exec_maxhdrsz;


struct buf *exec_copy_args(char **argp, struct exec_params *epp, int isargv, int *argc, int *argbc);
int exec_check(struct exec_params *epp);
void exec_setupstack(unsigned entryaddr, struct exec_params *epp);
void exec_alloc_freeall(struct exec_params *epp);
void *exec_alloc(int size, int ru, struct exec_params *epp);
int exec_estab(struct exec_params *epp);
void exec_save_args(struct exec_params *epp);
void exec_clear(struct exec_params *epp);

#else /* KERNEL */
#include <sys/exec_aout.h>
#endif
#endif