NetBSD-5.0.2/sys/arch/m68k/m68k/sunos_syscall.c
/* $NetBSD: sunos_syscall.c,v 1.19 2008/10/21 12:16:59 ad Exp $ */
/*-
* Portions Copyright (c) 2000 The NetBSD Foundation, Inc.
* 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 the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* Copyright (c) 1982, 1986, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* 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.
*
* from: Utah $Hdr: trap.c 1.37 92/12/20$
*
* @(#)trap.c 8.5 (Berkeley) 1/4/94
*/
/*
* Copyright (c) 1988 University of Utah.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* 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 the University of
* California, Berkeley and its contributors.
* 4. 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.
*
* from: Utah $Hdr: trap.c 1.37 92/12/20$
*
* @(#)trap.c 8.5 (Berkeley) 1/4/94
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sunos_syscall.c,v 1.19 2008/10/21 12:16:59 ad Exp $");
#include "opt_execfmt.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/acct.h>
#include <sys/kernel.h>
#include <sys/syscall.h>
#include <sys/syscallvar.h>
#include <sys/syslog.h>
#include <sys/user.h>
#include <machine/psl.h>
#include <machine/cpu.h>
#include <machine/reg.h>
#include <uvm/uvm_extern.h>
#include <compat/sunos/sunos_syscall.h>
#include <compat/sunos/sunos_exec.h>
void sunos_syscall_intern(struct proc *);
static void sunos_syscall_plain(register_t, struct lwp *, struct frame *);
static void sunos_syscall_fancy(register_t, struct lwp *, struct frame *);
void
sunos_syscall_intern(struct proc *p)
{
if (trace_is_enabled(p))
p->p_md.md_syscall = sunos_syscall_fancy;
else
p->p_md.md_syscall = sunos_syscall_plain;
}
static void
sunos_syscall_plain(register_t code, struct lwp *l, struct frame *frame)
{
struct proc *p = l->l_proc;
char *params;
const struct sysent *callp;
int error, nsys;
size_t argsize;
register_t args[16], rval[2];
nsys = p->p_emul->e_nsysent;
callp = p->p_emul->e_sysent;
/*
* SunOS passes the syscall-number on the stack, whereas
* BSD passes it in D0. So, we have to get the real "code"
* from the stack, and clean up the stack, as SunOS glue
* code assumes the kernel pops the syscall argument the
* glue pushed on the stack. Sigh...
*/
code = fuword((void *)frame->f_regs[SP]);
/*
* XXX
* Don't do this for sunos_sigreturn, as there's no stored pc
* on the stack to skip, the argument follows the syscall
* number without a gap.
*/
if (code != SUNOS_SYS_sigreturn) {
frame->f_regs[SP] += sizeof (int);
/*
* remember that we adjusted the SP,
* might have to undo this if the system call
* returns ERESTART.
*/
l->l_md.md_flags |= MDL_STACKADJ;
} else
l->l_md.md_flags &= ~MDL_STACKADJ;
params = (char *)frame->f_regs[SP] + sizeof(int);
switch (code) {
case SUNOS_SYS_syscall:
/*
* Code is first argument, followed by actual args.
*/
code = fuword(params);
params += sizeof(int);
break;
default:
break;
}
if (code < 0 || code >= nsys)
callp += p->p_emul->e_nosys; /* illegal */
else
callp += code;
argsize = callp->sy_argsize;
if (argsize) {
error = copyin(params, (void *)args, argsize);
if (error)
goto bad;
}
rval[0] = 0;
rval[1] = frame->f_regs[D1];
error = sy_call(callp, l, args, rval);
switch (error) {
case 0:
/*
* Reinitialize proc pointer `p' as it may be different
* if this is a child returning from fork syscall.
*/
p = curproc;
frame->f_regs[D0] = rval[0];
frame->f_regs[D1] = rval[1];
frame->f_sr &= ~PSL_C; /* carry bit */
break;
case ERESTART:
/*
* We always enter through a `trap' instruction, which is 2
* bytes, so adjust the pc by that amount.
*/
frame->f_pc = frame->f_pc - 2;
break;
case EJUSTRETURN:
/* nothing to do */
break;
default:
bad:
frame->f_regs[D0] = error;
frame->f_sr |= PSL_C; /* carry bit */
break;
}
/* need new p-value for this */
if (l->l_md.md_flags & MDL_STACKADJ) {
l->l_md.md_flags &= ~MDL_STACKADJ;
if (error == ERESTART)
frame->f_regs[SP] -= sizeof (int);
}
}
static void
sunos_syscall_fancy(register_t code, struct lwp *l, struct frame *frame)
{
struct proc *p = l->l_proc;
char *params;
const struct sysent *callp;
int error, nsys;
size_t argsize;
register_t args[16], rval[2];
nsys = p->p_emul->e_nsysent;
callp = p->p_emul->e_sysent;
/*
* SunOS passes the syscall-number on the stack, whereas
* BSD passes it in D0. So, we have to get the real "code"
* from the stack, and clean up the stack, as SunOS glue
* code assumes the kernel pops the syscall argument the
* glue pushed on the stack. Sigh...
*/
code = fuword((void *)frame->f_regs[SP]);
/*
* XXX
* Don't do this for sunos_sigreturn, as there's no stored pc
* on the stack to skip, the argument follows the syscall
* number without a gap.
*/
if (code != SUNOS_SYS_sigreturn) {
frame->f_regs[SP] += sizeof (int);
/*
* remember that we adjusted the SP,
* might have to undo this if the system call
* returns ERESTART.
*/
l->l_md.md_flags |= MDL_STACKADJ;
} else
l->l_md.md_flags &= ~MDL_STACKADJ;
params = (char *)frame->f_regs[SP] + sizeof(int);
switch (code) {
case SUNOS_SYS_syscall:
/*
* Code is first argument, followed by actual args.
*/
code = fuword(params);
params += sizeof(int);
break;
default:
break;
}
if (code < 0 || code >= nsys)
callp += p->p_emul->e_nosys; /* illegal */
else
callp += code;
argsize = callp->sy_argsize;
if (argsize) {
error = copyin(params, (void *)args, argsize);
if (error)
goto bad;
}
if ((error = trace_enter(code, args, callp->sy_narg)) != 0)
goto out;
rval[0] = 0;
rval[1] = frame->f_regs[D1];
error = sy_call(callp, l, args, rval);
out:
switch (error) {
case 0:
/*
* Reinitialize proc pointer `p' as it may be different
* if this is a child returning from fork syscall.
*/
p = curproc;
frame->f_regs[D0] = rval[0];
frame->f_regs[D1] = rval[1];
frame->f_sr &= ~PSL_C; /* carry bit */
break;
case ERESTART:
/*
* We always enter through a `trap' instruction, which is 2
* bytes, so adjust the pc by that amount.
*/
frame->f_pc = frame->f_pc - 2;
break;
case EJUSTRETURN:
/* nothing to do */
break;
default:
bad:
frame->f_regs[D0] = error;
frame->f_sr |= PSL_C; /* carry bit */
break;
}
/* need new p-value for this */
if (l->l_md.md_flags & MDL_STACKADJ) {
l->l_md.md_flags &= ~MDL_STACKADJ;
if (error == ERESTART)
frame->f_regs[SP] -= sizeof (int);
}
trace_exit(code, rval, error);
}