NetBSD-5.0.2/sys/arch/arm/arm/linux_syscall.c
/* $NetBSD: linux_syscall.c,v 1.22 2008/10/21 12:16:59 ad 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.
*
* ARMLinux emulation: syscall entry handling
*/
#include <sys/param.h>
__KERNEL_RCSID(0, "$NetBSD: linux_syscall.c,v 1.22 2008/10/21 12:16:59 ad Exp $");
#include <sys/device.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/reboot.h>
#include <sys/signalvar.h>
#include <sys/systm.h>
#include <sys/user.h>
#include <sys/syscallvar.h>
#include <uvm/uvm_extern.h>
#include <machine/cpu.h>
#include <machine/frame.h>
#include <machine/pcb.h>
#include <arm/swi.h>
#include <compat/linux/common/linux_errno.h>
#include <compat/linux/linux_syscall.h>
/* ARMLinux has some system calls of its very own. */
#define LINUX_ARM_NR_BASE 0x9f0000
#define LINUX_SYS_ARMBASE 0x000180 /* Must agree with syscalls.master */
void linux_syscall_intern(struct proc *);
void linux_syscall_plain(struct trapframe *, struct lwp *, u_int32_t);
void linux_syscall_fancy(struct trapframe *, struct lwp *, u_int32_t);
void
linux_syscall_intern(struct proc *p)
{
if (trace_is_enabled(p))
p->p_md.md_syscall = linux_syscall_fancy;
else
p->p_md.md_syscall = linux_syscall_plain;
}
void
linux_syscall_plain(trapframe_t *frame, struct lwp *l, u_int32_t insn)
{
const struct sysent *callp;
struct proc *p = l->l_proc;
int code, error;
register_t *args, rval[2];
code = insn & 0x00ffffff;
/* Remap ARM-specific syscalls onto the end of the standard range. */
if (code > LINUX_ARM_NR_BASE)
code = code - LINUX_ARM_NR_BASE + LINUX_SYS_ARMBASE;
code &= LINUX_SYS_NSYSENT - 1;
/* Linux passes all arguments in order in registers, which is nice. */
args = &frame->tf_r0;
callp = p->p_emul->e_sysent + code;
rval[0] = 0;
rval[1] = 0;
error = sy_call(callp, l, args, rval);
switch (error) {
case 0:
frame->tf_r0 = rval[0];
break;
case ERESTART:
/* Reconstruct the pc to point at the swi. */
frame->tf_pc -= INSN_SIZE;
break;
case EJUSTRETURN:
/* nothing to do */
break;
default:
error = native_to_linux_errno[error];
frame->tf_r0 = error;
break;
}
userret(l);
}
void
linux_syscall_fancy(trapframe_t *frame, struct lwp *l, u_int32_t insn)
{
const struct sysent *callp;
struct proc *p = l->l_proc;
int code, error;
register_t *args, rval[2];
code = insn & 0x00ffffff;
/* Remap ARM-specific syscalls onto the end of the standard range. */
if (code > LINUX_ARM_NR_BASE)
code = code - LINUX_ARM_NR_BASE + LINUX_SYS_ARMBASE;
code &= LINUX_SYS_NSYSENT - 1;
/* Linux passes all arguments in order in registers, which is nice. */
args = &frame->tf_r0;
callp = p->p_emul->e_sysent + code;
if ((error = trace_enter(code, args, callp->sy_narg)) != 0)
goto out;
rval[0] = 0;
rval[1] = 0;
error = sy_call(callp, l, args, rval);
out:
switch (error) {
case 0:
frame->tf_r0 = rval[0];
break;
case ERESTART:
/* Reconstruct the pc to point at the swi. */
frame->tf_pc -= INSN_SIZE;
break;
case EJUSTRETURN:
/* nothing to do */
break;
default:
error = native_to_linux_errno[error];
frame->tf_r0 = error;
break;
}
trace_exit(code, rval, error);
userret(l);
}