[src/trunk]: src/sys/arch/powerpc/powerpc Add common syscall dispatcher. Als...

[matt <matt%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/58dac7e0ebd9
branches:  trunk
changeset: 533349:58dac7e0ebd9
user:      matt <matt%NetBSD.org@localhost>
date:      Fri Jun 28 02:30:06 2002 +0000

description:
Add common syscall dispatcher.  Also put child_return in here.

diffstat:

 sys/arch/powerpc/powerpc/syscall.c |  188 +++++++++++++++++++++++++++++++++++++
 1 files changed, 188 insertions(+), 0 deletions(-)

diffs (192 lines):

diff -r 2c7b63753a67 -r 58dac7e0ebd9 sys/arch/powerpc/powerpc/syscall.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/powerpc/powerpc/syscall.c        Fri Jun 28 02:30:06 2002 +0000
@@ -0,0 +1,188 @@
+/*     $NetBSD: syscall.c,v 1.1 2002/06/28 02:30:06 matt Exp $ */
+
+/*
+ * Copyright (C) 2002 Matt Thomas
+ * Copyright (C) 1995, 1996 Wolfgang Solfrank.
+ * Copyright (C) 1995, 1996 TooLs GmbH.
+ * All rights reserved.
+ *
+ * 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 TooLs GmbH.
+ * 4. The name of TooLs GmbH may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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 "opt_altivec.h"
+#include "opt_ktrace.h"
+#include "opt_systrace.h"
+#include "opt_multiprocessor.h"
+
+#include <sys/param.h>
+#include <sys/proc.h>
+#include <sys/reboot.h>
+#include <sys/syscall.h>
+#include <sys/systm.h>
+#include <sys/user.h>
+#ifdef KTRACE
+#include <sys/ktrace.h>
+#endif
+#ifdef SYSTRACE
+#include <sys/systrace.h>
+#endif
+
+#include <uvm/uvm_extern.h>
+
+#include <machine/cpu.h>
+#include <machine/frame.h>
+#if 0
+#include <machine/pcb.h>
+#include <machine/psl.h>
+#include <machine/trap.h>
+#include <powerpc/spr.h>
+#endif
+
+#define        FIRSTARG        3               /* first argument is in reg 3 */
+#define        NARGREG         8               /* 8 args are in registers */
+#define        MOREARGS(sp)    ((caddr_t)((uintptr_t)(sp) + 8)) /* more args go here */
+
+static void syscall_fancy(struct trapframe *frame);
+
+void
+syscall_fancy(struct trapframe *frame)
+{
+       struct proc *p = curproc;
+       const struct sysent *callp;
+       size_t argsize;
+       register_t code;
+       register_t *params, rval[2];
+       register_t args[10];
+       int error;
+       int n;
+
+       KERNEL_PROC_LOCK(p);
+
+       curcpu()->ci_ev_scalls.ev_count++;
+       uvmexp.syscalls++;
+
+       code = frame->fixreg[0];
+       callp = p->p_emul->e_sysent;
+       params = frame->fixreg + FIRSTARG;
+       n = NARGREG;
+
+       switch (code) {
+       case SYS_syscall:
+               /*
+                * code is first argument,
+                * followed by actual args.
+                */
+               code = *params++;
+               n -= 1;
+               break;
+       case SYS___syscall:
+               params++;
+               code = *params++;
+               n -= 2;
+               break;
+       default:
+               break;
+       }
+
+       code &= (SYS_NSYSENT - 1);
+       callp += code;
+       argsize = callp->sy_argsize;
+
+       if (argsize > n * sizeof(register_t)) {
+               memcpy(args, params, n * sizeof(register_t));
+               error = copyin(MOREARGS(frame->fixreg[1]),
+                      args + n,
+                      argsize - n * sizeof(register_t));
+               if (error)
+                       goto syscall_bad;
+               params = args;
+       }
+
+       if ((error = trace_enter(p, code, params, rval)) != 0)
+               goto syscall_bad;
+
+       rval[0] = 0;
+       rval[1] = 0;
+
+       error = (*callp->sy_call)(p, params, rval);
+       switch (error) {
+       case 0:
+               frame->fixreg[FIRSTARG] = rval[0];
+               frame->fixreg[FIRSTARG + 1] = rval[1];
+               frame->cr &= ~0x10000000;
+               break;
+       case ERESTART:
+               /*
+                * Set user's pc back to redo the system call.
+                */
+               frame->srr0 -= 4;
+               break;
+       case EJUSTRETURN:
+               /* nothing to do */
+               break;
+       default:
+syscall_bad:
+               if (p->p_emul->e_errno)
+                       error = p->p_emul->e_errno[error];
+               frame->fixreg[FIRSTARG] = error;
+               frame->cr |= 0x10000000;
+               break;
+       }
+       KERNEL_PROC_UNLOCK(p);
+       trace_exit(p, code, params, rval, error);
+}
+
+void
+syscall_intern(struct proc *p)
+{
+       p->p_md.md_syscall = syscall_fancy;
+}
+
+void
+child_return(void *arg)
+{
+       struct proc * const p = arg;
+       struct trapframe * const tf = trapframe(p);
+
+       KERNEL_PROC_UNLOCK(p);
+
+       tf->fixreg[FIRSTARG] = 0;
+       tf->fixreg[FIRSTARG + 1] = 1;
+       tf->cr &= ~0x10000000;
+       tf->srr1 &= ~(PSL_FP|PSL_VEC);  /* Disable FP & AltiVec, as we can't
+                                          be them. */
+       p->p_addr->u_pcb.pcb_fpcpu = NULL;
+#ifdef KTRACE
+       if (KTRPOINT(p, KTR_SYSRET)) {
+               KERNEL_PROC_LOCK(p);
+               ktrsysret(p, SYS_fork, 0, 0);
+               KERNEL_PROC_UNLOCK(p);
+       }
+#endif
+       /* Profiling?                                                   XXX */
+       curcpu()->ci_schedstate.spc_curpriority = p->p_priority;
+}
+