151 lines
4.1 KiB
C
151 lines
4.1 KiB
C
/* $NetBSD: freebsd_syscall.c,v 1.2 2017/08/08 08:04:06 maxv Exp $ */
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/*-
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* Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Charles M. Hannum.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: freebsd_syscall.c,v 1.2 2017/08/08 08:04:06 maxv Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/signal.h>
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#include <sys/syscall.h>
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#include <sys/syscallvar.h>
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#include <uvm/uvm_extern.h>
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#include <machine/cpu.h>
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#include <machine/psl.h>
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#include <machine/userret.h>
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#include <compat/sys/signal.h>
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#include <compat/freebsd/freebsd_machdep.h>
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#include <compat/freebsd/freebsd_syscall.h>
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void freebsd_syscall(struct trapframe *);
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void
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freebsd_syscall_intern(struct proc *p)
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{
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p->p_md.md_syscall = freebsd_syscall;
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}
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/*
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* syscall(frame):
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* System call request from POSIX system call gate interface to kernel.
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* Like trap(), argument is call by reference.
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*/
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void
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freebsd_syscall(struct trapframe *frame)
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{
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char *params;
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const struct sysent *callp;
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struct lwp *l;
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struct proc *p;
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int error;
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size_t argsize;
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register_t code, args[8], rval[2];
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l = curlwp;
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p = l->l_proc;
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LWP_CACHE_CREDS(l, p);
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code = frame->tf_eax;
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callp = p->p_emul->e_sysent;
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params = (char *)frame->tf_esp + sizeof(int);
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switch (code) {
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case SYS_syscall:
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/*
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* Code is first argument, followed by actual args.
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*/
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code = fuword(params);
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params += sizeof(int);
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break;
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case SYS___syscall:
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/*
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* Like syscall, but code is a quad, so as to maintain
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* quad alignment for the rest of the arguments.
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*/
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code = fuword(params + _QUAD_LOWWORD * sizeof(int));
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params += sizeof(quad_t);
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break;
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default:
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break;
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}
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code &= (SYS_NSYSENT - 1);
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callp += code;
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argsize = callp->sy_argsize;
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if (argsize) {
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error = copyin(params, (void *)args, argsize);
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if (error)
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goto bad;
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}
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if (!__predict_false(p->p_trace_enabled || KDTRACE_ENTRY(callp->sy_entry))
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|| (error = trace_enter(code, callp, args)) == 0) {
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rval[0] = 0;
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rval[1] = frame->tf_edx; /* need to keep edx for shared FreeBSD bins */
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error = sy_call(callp, l, args, rval);
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}
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switch (error) {
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case 0:
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frame->tf_eax = rval[0];
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frame->tf_edx = rval[1];
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frame->tf_eflags &= ~PSL_C; /* carry bit */
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break;
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case ERESTART:
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/*
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* The offset to adjust the PC by depends on whether we entered
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* the kernel through the trap or call gate. We pushed the
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* size of the instruction into tf_err on entry.
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*/
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frame->tf_eip -= frame->tf_err;
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break;
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case EJUSTRETURN:
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/* nothing to do */
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break;
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default:
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bad:
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frame->tf_eax = error;
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frame->tf_eflags |= PSL_C; /* carry bit */
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break;
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}
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if (__predict_false(p->p_trace_enabled || KDTRACE_ENTRY(callp->sy_return)))
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trace_exit(code, callp, args, rval, error);
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userret(l);
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}
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