/* $NetBSD: ibcs2_syscall.c,v 1.44 2008/10/21 12:16:59 ad Exp $ */ /*- * Copyright (c) 1998, 2000 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. */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: ibcs2_syscall.c,v 1.44 2008/10/21 12:16:59 ad Exp $"); #if defined(_KERNEL_OPT) #include "opt_vm86.h" #endif #include <sys/param.h> #include <sys/systm.h> #include <sys/proc.h> #include <sys/user.h> #include <sys/signal.h> #include <sys/syscall.h> #include <sys/syscallvar.h> #include <uvm/uvm_extern.h> #include <machine/cpu.h> #include <machine/psl.h> #include <machine/userret.h> #include <compat/ibcs2/ibcs2_errno.h> #include <compat/ibcs2/ibcs2_exec.h> #include <compat/ibcs2/ibcs2_syscall.h> #include <machine/ibcs2_machdep.h> void ibcs2_syscall_plain(struct trapframe *); void ibcs2_syscall_fancy(struct trapframe *); extern struct sysent ibcs2_sysent[]; void ibcs2_syscall_intern(struct proc *p) { if (trace_is_enabled(p)) p->p_md.md_syscall = ibcs2_syscall_fancy; else p->p_md.md_syscall = ibcs2_syscall_plain; } /* * syscall(frame): * System call request from POSIX system call gate interface to kernel. * Like trap(), argument is call by reference. */ void ibcs2_syscall_plain(frame) struct trapframe *frame; { char *params; const struct sysent *callp; struct lwp *l; int error; size_t argsize; register_t code, args[8], rval[2]; l = curlwp; LWP_CACHE_CREDS(l, l->l_proc); code = frame->tf_eax; if (IBCS2_HIGH_SYSCALL(code)) code = IBCS2_CVT_HIGH_SYSCALL(code); callp = ibcs2_sysent; params = (char *)frame->tf_esp + sizeof(int); switch (code) { case SYS_syscall: /* * Code is first argument, followed by actual args. */ code = fuword(params); params += sizeof(int); break; default: break; } code &= (IBCS2_SYS_NSYSENT - 1); callp += code; argsize = callp->sy_argsize; if (argsize) { error = copyin(params, (void *)args, argsize); if (error) goto bad; } rval[0] = 0; rval[1] = 0; error = sy_call(callp, l, args, rval); switch (error) { case 0: frame->tf_eax = rval[0]; frame->tf_edx = rval[1]; frame->tf_eflags &= ~PSL_C; /* carry bit */ break; case ERESTART: /* * The offset to adjust the PC by depends on whether we entered * the kernel through the trap or call gate. We pushed the * size of the instruction into tf_err on entry. */ frame->tf_eip -= frame->tf_err; break; case EJUSTRETURN: /* nothing to do */ break; default: bad: error = native_to_ibcs2_errno[error]; frame->tf_eax = error; frame->tf_eflags |= PSL_C; /* carry bit */ break; } userret(l); } /* * syscall(frame): * System call request from POSIX system call gate interface to kernel. * Like trap(), argument is call by reference. */ void ibcs2_syscall_fancy(frame) struct trapframe *frame; { char * params; const struct sysent *callp; struct lwp *l; int error; size_t argsize; register_t code, args[8], rval[2]; l = curlwp; LWP_CACHE_CREDS(l, l->l_proc); code = frame->tf_eax; if (IBCS2_HIGH_SYSCALL(code)) code = IBCS2_CVT_HIGH_SYSCALL(code); callp = ibcs2_sysent; params = (char *)frame->tf_esp + sizeof(int); switch (code) { case SYS_syscall: /* * Code is first argument, followed by actual args. */ code = fuword(params); params += sizeof(int); break; default: break; } code &= (IBCS2_SYS_NSYSENT - 1); 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) { rval[0] = 0; rval[1] = 0; error = sy_call(callp, l, args, rval); } switch (error) { case 0: frame->tf_eax = rval[0]; frame->tf_edx = rval[1]; frame->tf_eflags &= ~PSL_C; /* carry bit */ break; case ERESTART: /* * The offset to adjust the PC by depends on whether we entered * the kernel through the trap or call gate. We pushed the * size of the instruction into tf_err on entry. */ frame->tf_eip -= frame->tf_err; break; case EJUSTRETURN: /* nothing to do */ break; default: bad: error = native_to_ibcs2_errno[error]; frame->tf_eax = error; frame->tf_eflags |= PSL_C; /* carry bit */ break; } trace_exit(code, rval, error); userret(l); }