/*-
 * Copyright (c) 1998 Mark Newton
 * All rights reserved.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Christos Zoulas.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

/* XXX we use functions that might not exist. */
#include "opt_compat.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/sysent.h>
#include <sys/imgact.h>
#include <sys/imgact_elf.h>
#include <sys/fcntl.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/namei.h>
#include <sys/socket.h>
#include <sys/syscallsubr.h>
#include <sys/vnode.h>
#include <vm/vm.h>
#include <sys/exec.h>
#include <sys/kernel.h>
#include <machine/cpu.h>
#include <netinet/in.h>

#include <compat/svr4/svr4.h>
#include <compat/svr4/svr4_types.h>
#include <compat/svr4/svr4_syscall.h>
#include <compat/svr4/svr4_signal.h>
#include <compat/svr4/svr4_socket.h>
#include <compat/svr4/svr4_sockio.h>
#include <compat/svr4/svr4_errno.h>
#include <compat/svr4/svr4_proto.h>
#include <compat/svr4/svr4_siginfo.h>
#include <compat/svr4/svr4_util.h>

int bsd_to_svr4_errno[ELAST+1] = {
        0,
        SVR4_EPERM,
        SVR4_ENOENT,
        SVR4_ESRCH,
        SVR4_EINTR,
        SVR4_EIO,
        SVR4_ENXIO,
        SVR4_E2BIG,
        SVR4_ENOEXEC,
        SVR4_EBADF,
        SVR4_ECHILD,
        SVR4_EDEADLK,
        SVR4_ENOMEM,
        SVR4_EACCES,
        SVR4_EFAULT,
        SVR4_ENOTBLK,
        SVR4_EBUSY,
        SVR4_EEXIST,
        SVR4_EXDEV,
        SVR4_ENODEV,
        SVR4_ENOTDIR,
        SVR4_EISDIR,
        SVR4_EINVAL,
        SVR4_ENFILE,
        SVR4_EMFILE,
        SVR4_ENOTTY,
        SVR4_ETXTBSY,
        SVR4_EFBIG,
        SVR4_ENOSPC,
        SVR4_ESPIPE,
        SVR4_EROFS,
        SVR4_EMLINK,
        SVR4_EPIPE,
        SVR4_EDOM,
        SVR4_ERANGE,
        SVR4_EAGAIN,
        SVR4_EINPROGRESS,
        SVR4_EALREADY,
        SVR4_ENOTSOCK,
        SVR4_EDESTADDRREQ,
        SVR4_EMSGSIZE,
        SVR4_EPROTOTYPE,
        SVR4_ENOPROTOOPT,
        SVR4_EPROTONOSUPPORT,
        SVR4_ESOCKTNOSUPPORT,
        SVR4_EOPNOTSUPP,
        SVR4_EPFNOSUPPORT,
        SVR4_EAFNOSUPPORT,
        SVR4_EADDRINUSE,
        SVR4_EADDRNOTAVAIL,
        SVR4_ENETDOWN,
        SVR4_ENETUNREACH,
        SVR4_ENETRESET,
        SVR4_ECONNABORTED,
        SVR4_ECONNRESET,
        SVR4_ENOBUFS,
        SVR4_EISCONN,
        SVR4_ENOTCONN,
        SVR4_ESHUTDOWN,
        SVR4_ETOOMANYREFS,
        SVR4_ETIMEDOUT,
        SVR4_ECONNREFUSED,
        SVR4_ELOOP,
        SVR4_ENAMETOOLONG,
        SVR4_EHOSTDOWN,
        SVR4_EHOSTUNREACH,
        SVR4_ENOTEMPTY,
        SVR4_EPROCLIM,
        SVR4_EUSERS,
        SVR4_EDQUOT,
        SVR4_ESTALE,
        SVR4_EREMOTE,
        SVR4_EBADRPC,
        SVR4_ERPCMISMATCH,
        SVR4_EPROGUNAVAIL,
        SVR4_EPROGMISMATCH,
        SVR4_EPROCUNAVAIL,
        SVR4_ENOLCK,
        SVR4_ENOSYS,
        SVR4_EFTYPE,
        SVR4_EAUTH,
        SVR4_ENEEDAUTH,
        SVR4_EIDRM,
        SVR4_ENOMSG,
};


static int 	svr4_fixup(register_t **stack_base, struct image_params *imgp);

extern struct sysent svr4_sysent[];
#undef szsigcode
#undef sigcode

extern int svr4_szsigcode;
extern char svr4_sigcode[];

struct sysentvec svr4_sysvec = {
	.sv_size	= SVR4_SYS_MAXSYSCALL,
	.sv_table	= svr4_sysent,
	.sv_mask	= 0xff,
	.sv_sigsize	= SVR4_NSIG-1, /* NB: signal trans table indexed with signno-1 */
	.sv_sigtbl	= bsd_to_svr4_sig+1,
	.sv_errsize	= ELAST,  /* ELAST */
	.sv_errtbl	= bsd_to_svr4_errno,
	.sv_transtrap	= NULL,
	.sv_fixup	= svr4_fixup,
	.sv_sendsig	= svr4_sendsig,
	.sv_sigcode	= svr4_sigcode,
	.sv_szsigcode	= &svr4_szsigcode,
	.sv_prepsyscall	= NULL,
	.sv_name	= "SVR4",
	.sv_coredump	= elf32_coredump,
	.sv_imgact_try	= NULL,
	.sv_minsigstksz	= SVR4_MINSIGSTKSZ,
	.sv_pagesize	= PAGE_SIZE,
	.sv_minuser	= VM_MIN_ADDRESS,
	.sv_maxuser	= VM_MAXUSER_ADDRESS,
	.sv_usrstack	= USRSTACK,
	.sv_psstrings	= PS_STRINGS,
	.sv_stackprot	= VM_PROT_ALL,
	.sv_copyout_strings = exec_copyout_strings,
	.sv_setregs	= exec_setregs,
	.sv_fixlimit	= NULL,
	.sv_maxssiz     = NULL,
	.sv_flags	= SV_ABI_UNDEF | SV_IA32 | SV_ILP32
};

const char      svr4_emul_path[] = "/compat/svr4";

Elf32_Brandinfo svr4_brand = {
	.brand		= ELFOSABI_SYSV,
	.machine	= EM_386, /* XXX only implemented for x86 so far. */
	.compat_3_brand	= "SVR4",
	.emul_path	= svr4_emul_path,
	.interp_path	= "/lib/libc.so.1",
	.sysvec		= &svr4_sysvec,
	.interp_newpath	= NULL,
	.flags		= 0
};

static int
svr4_fixup(register_t **stack_base, struct image_params *imgp)
{
	Elf32_Auxargs *args;
	register_t *pos;
             
	KASSERT(curthread->td_proc == imgp->proc,
	    ("unsafe svr4_fixup(), should be curproc"));
	args = (Elf32_Auxargs *)imgp->auxargs;
	pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2);  
    
	if (args->trace)
		AUXARGS_ENTRY(pos, AT_DEBUG, 1);
	if (args->execfd != -1)
		AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
	AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
	AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
	AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
	AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
	AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
	AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
	AUXARGS_ENTRY(pos, AT_BASE, args->base);
	AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
	AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
	AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
	AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
	AUXARGS_ENTRY(pos, AT_NULL, 0);
	
	free(imgp->auxargs, M_TEMP);      
	imgp->auxargs = NULL;

	(*stack_base)--;
	**stack_base = (register_t)imgp->args->argc;
	return 0;
}

/*
 * Search an alternate path before passing pathname arguments on
 * to system calls. Useful for keeping a separate 'emulation tree'.
 *
 * If cflag is set, we check if an attempt can be made to create
 * the named file, i.e. we check if the directory it should
 * be in exists.
 */
int
svr4_emul_find(struct thread *td, char *path, enum uio_seg pathseg,
    char **pbuf, int create)
{

	return (kern_alternate_path(td, svr4_emul_path, path, pathseg, pbuf,
	    create, AT_FDCWD));
}

static int
svr4_elf_modevent(module_t mod, int type, void *data)
{
	int error;

	error = 0;

	switch(type) {
	case MOD_LOAD:
		if (elf32_insert_brand_entry(&svr4_brand) < 0) {
			printf("cannot insert svr4 elf brand handler\n");
			error = EINVAL;
			break;
		}
		if (bootverbose)
			printf("svr4 ELF exec handler installed\n");
		svr4_sockcache_init();
		break;
	case MOD_UNLOAD:
		/* Only allow the emulator to be removed if it isn't in use. */
		if (elf32_brand_inuse(&svr4_brand) != 0) {
			error = EBUSY;
		} else if (elf32_remove_brand_entry(&svr4_brand) < 0) {
			error = EINVAL;
		}

		if (error) {
			printf("Could not deinstall ELF interpreter entry (error %d)\n",
			       error);
			break;
		}
		if (bootverbose)
			printf("svr4 ELF exec handler removed\n");
		svr4_sockcache_destroy();
		break;
	default:
		return (EOPNOTSUPP);
		break;
	}
	return error;
}

static moduledata_t svr4_elf_mod = {
	"svr4elf",
	svr4_elf_modevent,
	0
};
DECLARE_MODULE(svr4elf, svr4_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
MODULE_DEPEND(svr4elf, streams, 1, 1, 1);