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/* $OpenBSD: syscall.c,v 1.14 2012/04/11 14:38:55 mikeb Exp $ */
/* $NetBSD: syscall.c,v 1.24 2003/11/14 19:03:17 scw Exp $ */
/*-
* Copyright (c) 2000, 2003 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum.
*
* 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.
*
* 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) 1994-1998 Mark Brinicombe.
* Copyright (c) 1994 Brini.
* All rights reserved.
*
* This code is derived from software written for Brini by Mark Brinicombe
*
* 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 Mark Brinicombe
* for the NetBSD Project.
* 4. The name of the company nor the name of the author may 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 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.
*
* syscall entry handling
*
* Created : 09/11/94
*/
#include <sys/param.h>
#include <sys/device.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/reboot.h>
#include <sys/signalvar.h>
#include <sys/syscall.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/user.h>
#ifdef KTRACE
#include <sys/ktrace.h>
#endif
#include "systrace.h"
#include <dev/systrace.h>
#include <uvm/uvm_extern.h>
#include <machine/cpu.h>
#include <machine/frame.h>
#include <machine/pcb.h>
#include <arm/swi.h>
#define MAXARGS 8
void
swi_handler(trapframe_t *frame)
{
struct proc *p = curproc;
const struct sysent *callp;
int code, error, orig_error;
u_int nap = 4, nargs;
register_t *ap, *args, copyargs[MAXARGS], rval[2];
uvmexp.syscalls++;
/* Re-enable interrupts if they were enabled previously */
if (__predict_true((frame->tf_spsr & I32_bit) == 0))
enable_interrupts(I32_bit);
p->p_addr->u_pcb.pcb_tf = frame;
code = frame->tf_r12;
ap = &frame->tf_r0;
callp = p->p_emul->e_sysent;
switch (code) {
case SYS_syscall:
code = *ap++;
nap--;
break;
case SYS___syscall:
code = ap[_QUAD_LOWWORD];
ap += 2;
nap -= 2;
break;
}
if (code < 0 || code >= p->p_emul->e_nsysent) {
callp += p->p_emul->e_nosys;
} else {
callp += code;
}
nargs = callp->sy_argsize / sizeof(register_t);
if (nargs <= nap) {
args = ap;
error = 0;
} else {
KASSERT(nargs <= MAXARGS);
memcpy(copyargs, ap, nap * sizeof(register_t));
error = copyin((void *)frame->tf_usr_sp, copyargs + nap,
(nargs - nap) * sizeof(register_t));
args = copyargs;
}
orig_error = error;
#ifdef SYSCALL_DEBUG
scdebug_call(p, code, args);
#endif
#ifdef KTRACE
if (KTRPOINT(p, KTR_SYSCALL))
ktrsyscall(p, code, callp->sy_argsize, args);
#endif
if (error)
goto bad;
rval[0] = 0;
rval[1] = frame->tf_r1;
#if NSYSTRACE > 0
if (ISSET(p->p_flag, P_SYSTRACE))
orig_error = error = systrace_redirect(code, p, args, rval);
else
#endif
orig_error = error = (*callp->sy_call)(p, args, rval);
switch (error) {
case 0:
frame->tf_r0 = rval[0];
frame->tf_r1 = rval[1];
frame->tf_spsr &= ~PSR_C_bit; /* carry bit */
break;
case ERESTART:
/*
* Reconstruct the pc to point at the swi.
*/
frame->tf_pc -= INSN_SIZE;
break;
case EJUSTRETURN:
/* nothing to do */
break;
default:
bad:
frame->tf_r0 = error;
frame->tf_spsr |= PSR_C_bit; /* carry bit */
break;
}
#ifdef SYSCALL_DEBUG
scdebug_ret(p, code, orig_error, rval);
#endif
userret(p);
#ifdef KTRACE
if (KTRPOINT(p, KTR_SYSRET))
ktrsysret(p, code, orig_error, rval[0]);
#endif
}
void
child_return(arg)
void *arg;
{
struct proc *p = arg;
struct trapframe *frame = p->p_addr->u_pcb.pcb_tf;
frame->tf_r0 = 0;
frame->tf_spsr &= ~PSR_C_bit; /* carry bit */
userret(p);
#ifdef KTRACE
if (KTRPOINT(p, KTR_SYSRET)) {
ktrsysret(p,
(p->p_flag & P_THREAD) ? SYS___tfork :
(p->p_p->ps_flags & PS_PPWAIT) ? SYS_vfork : SYS_fork,
0, 0);
}
#endif
}
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