Add common syscall dispatcher. Also put child_return in here.
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matt
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67c6a98161
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f7a6553147
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/* $NetBSD: syscall.c,v 1.1 2002/06/28 02:30:06 matt Exp $ */
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/*
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* Copyright (C) 2002 Matt Thomas
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* Copyright (C) 1995, 1996 Wolfgang Solfrank.
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* Copyright (C) 1995, 1996 TooLs GmbH.
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* All rights reserved.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "opt_altivec.h"
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#include "opt_ktrace.h"
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#include "opt_systrace.h"
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#include "opt_multiprocessor.h"
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/reboot.h>
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#include <sys/syscall.h>
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#include <sys/systm.h>
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#include <sys/user.h>
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#ifdef KTRACE
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#include <sys/ktrace.h>
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#endif
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#ifdef SYSTRACE
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#include <sys/systrace.h>
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#endif
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#include <uvm/uvm_extern.h>
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#include <machine/cpu.h>
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#include <machine/frame.h>
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#if 0
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#include <machine/pcb.h>
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#include <machine/psl.h>
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#include <machine/trap.h>
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#include <powerpc/spr.h>
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#endif
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#define FIRSTARG 3 /* first argument is in reg 3 */
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#define NARGREG 8 /* 8 args are in registers */
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#define MOREARGS(sp) ((caddr_t)((uintptr_t)(sp) + 8)) /* more args go here */
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static void syscall_fancy(struct trapframe *frame);
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void
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syscall_fancy(struct trapframe *frame)
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{
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struct proc *p = curproc;
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const struct sysent *callp;
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size_t argsize;
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register_t code;
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register_t *params, rval[2];
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register_t args[10];
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int error;
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int n;
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KERNEL_PROC_LOCK(p);
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curcpu()->ci_ev_scalls.ev_count++;
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uvmexp.syscalls++;
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code = frame->fixreg[0];
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callp = p->p_emul->e_sysent;
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params = frame->fixreg + FIRSTARG;
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n = NARGREG;
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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,
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* followed by actual args.
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*/
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code = *params++;
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n -= 1;
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break;
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case SYS___syscall:
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params++;
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code = *params++;
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n -= 2;
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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 > n * sizeof(register_t)) {
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memcpy(args, params, n * sizeof(register_t));
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error = copyin(MOREARGS(frame->fixreg[1]),
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args + n,
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argsize - n * sizeof(register_t));
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if (error)
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goto syscall_bad;
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params = args;
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}
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if ((error = trace_enter(p, code, params, rval)) != 0)
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goto syscall_bad;
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rval[0] = 0;
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rval[1] = 0;
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error = (*callp->sy_call)(p, params, rval);
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switch (error) {
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case 0:
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frame->fixreg[FIRSTARG] = rval[0];
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frame->fixreg[FIRSTARG + 1] = rval[1];
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frame->cr &= ~0x10000000;
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break;
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case ERESTART:
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/*
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* Set user's pc back to redo the system call.
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*/
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frame->srr0 -= 4;
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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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syscall_bad:
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if (p->p_emul->e_errno)
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error = p->p_emul->e_errno[error];
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frame->fixreg[FIRSTARG] = error;
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frame->cr |= 0x10000000;
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break;
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}
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KERNEL_PROC_UNLOCK(p);
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trace_exit(p, code, params, rval, error);
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}
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void
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syscall_intern(struct proc *p)
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{
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p->p_md.md_syscall = syscall_fancy;
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}
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void
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child_return(void *arg)
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{
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struct proc * const p = arg;
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struct trapframe * const tf = trapframe(p);
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KERNEL_PROC_UNLOCK(p);
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tf->fixreg[FIRSTARG] = 0;
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tf->fixreg[FIRSTARG + 1] = 1;
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tf->cr &= ~0x10000000;
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tf->srr1 &= ~(PSL_FP|PSL_VEC); /* Disable FP & AltiVec, as we can't
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be them. */
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p->p_addr->u_pcb.pcb_fpcpu = NULL;
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#ifdef KTRACE
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if (KTRPOINT(p, KTR_SYSRET)) {
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KERNEL_PROC_LOCK(p);
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ktrsysret(p, SYS_fork, 0, 0);
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KERNEL_PROC_UNLOCK(p);
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}
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#endif
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/* Profiling? XXX */
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curcpu()->ci_schedstate.spc_curpriority = p->p_priority;
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}
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