bsd/dev/ppc/systemcalls.c

   1 /*
   2  * Copyright (c) 2000-2001 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25
  26 #include <kern/task.h>
  27 #include <kern/thread.h>
  28 #include <kern/thread_act.h>
  29 #include <kern/assert.h>
  30 #include <kern/clock.h>
  31 #include <mach/machine/thread_status.h>
  32 #include <ppc/savearea.h>
  33
  34 #include <sys/kernel.h>
  35 #include <sys/vm.h>
  36 #include <sys/proc.h>
  37 #include <sys/syscall.h>
  38 #include <sys/systm.h>
  39 #include <sys/user.h>
  40 #include <sys/errno.h>
  41 #include <sys/ktrace.h>
  42 #include <sys/kdebug.h>
  43
  44 extern void
  45 unix_syscall(
  46         struct savearea *regs
  47 );
  48
  49 extern struct savearea *
  50 find_user_regs(
  51         thread_act_t act);
  52
  53 extern void enter_funnel_section(funnel_t *funnel_lock);
  54 extern void exit_funnel_section(void);
  55
  56 /*
  57  * Function:    unix_syscall
  58  *
  59  * Inputs:      regs    - pointer to Process Control Block
  60  *
  61  * Outputs:     none
  62  */
  63 void
  64 unix_syscall(
  65         struct savearea *regs
  66 )
  67 {
  68         thread_act_t            thread_act;
  69         struct uthread          *uthread;
  70         struct proc                     *proc;
  71         struct sysent           *callp;
  72         int                                     error;
  73         unsigned short          code;
  74         boolean_t                       flavor;
  75         int funnel_type;
  76
  77         thread_act = current_act();
  78         uthread = get_bsdthread_info(thread_act);
  79
  80         if (!(uthread->uu_flag & P_VFORK))
  81                 proc = (struct proc *)get_bsdtask_info(current_task());
  82         else
  83                 proc = current_proc();
  84
  85         flavor = (((unsigned int)regs->save_r0) == NULL)? 1: 0;
  86
  87         uthread->uu_ar0 = (int *)regs;
  88
  89         if (flavor)
  90                 code = regs->save_r3;
  91         else
  92                 code = regs->save_r0;
  93
  94         callp = (code >= nsysent) ? &sysent[63] : &sysent[code];
  95
  96 #ifdef  DEBUG
  97         if (callp->sy_narg > 8)
  98                 panic("unix_syscall: max arg count exceeded");
  99 #endif
 100
 101         if (callp->sy_narg != 0) {
 102                 if ( !flavor) {
 103                         uthread->uu_arg[0] = regs->save_r3;
 104                         uthread->uu_arg[1] = regs->save_r4;
 105                         uthread->uu_arg[2] = regs->save_r5;
 106                         uthread->uu_arg[3] = regs->save_r6;
 107                         uthread->uu_arg[4] = regs->save_r7;
 108                         uthread->uu_arg[5] = regs->save_r8;
 109                         uthread->uu_arg[6] = regs->save_r9;
 110                         uthread->uu_arg[7] = regs->save_r10;
 111                 } else {
 112                         uthread->uu_arg[0] = regs->save_r4;
 113                         uthread->uu_arg[1] = regs->save_r5;
 114                         uthread->uu_arg[2] = regs->save_r6;
 115                         uthread->uu_arg[3] = regs->save_r7;
 116                         uthread->uu_arg[4] = regs->save_r8;
 117                         uthread->uu_arg[5] = regs->save_r9;
 118                         uthread->uu_arg[7] = regs->save_r10;
 119                 }
 120         }
 121
 122         callp = (code >= nsysent) ? &sysent[63] : &sysent[code];
 123
 124         if (kdebug_enable && (code != 180)) {
 125                 if (flavor)
 126                         KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START,
 127                                 regs->save_r4, regs->save_r5, regs->save_r6, regs->save_r7, 0);
 128                 else
 129                         KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START,
 130                                 regs->save_r3, regs->save_r4, regs->save_r5, regs->save_r6, 0);
 131         }
 132
 133         funnel_type = (int)callp->sy_funnel;
 134         if(funnel_type == KERNEL_FUNNEL)
 135                  enter_funnel_section(kernel_flock);
 136         else if (funnel_type == NETWORK_FUNNEL)
 137                  enter_funnel_section(network_flock);
 138
 139
 140         uthread->uu_rval[0] = 0;
 141
 142         /*
 143          * r4 is volatile, if we set it to regs->save_r4 here the child
 144          * will have parents r4 after execve
 145          */
 146         uthread->uu_rval[1] = 0;
 147
 148         error = 0;
 149
 150         /*
 151          * PPC runtime calls cerror after every unix system call, so
 152          * assume no error and adjust the "pc" to skip this call.
 153          * It will be set back to the cerror call if an error is detected.
 154          */
 155         regs->save_srr0 += 4;
 156
 157         if (KTRPOINT(proc, KTR_SYSCALL))
 158                 ktrsyscall(proc, code, callp->sy_narg, uthread->uu_arg, funnel_type);
 159
 160         error = (*(callp->sy_call))(proc, (void *)uthread->uu_arg, &(uthread->uu_rval[0]));
 161
 162         regs = find_user_regs(thread_act);
 163
 164         if (error == ERESTART) {
 165                 regs->save_srr0 -= 8;
 166         } else if (error != EJUSTRETURN) {
 167                 if (error) {
 168                         regs->save_r3 = (long long)error;
 169                         /* set the "pc" to execute cerror routine */
 170                         regs->save_srr0 -= 4;
 171                 } else { /* (not error) */
 172                         regs->save_r3 = uthread->uu_rval[0];
 173                         regs->save_r4 = uthread->uu_rval[1];
 174                 }
 175         }
 176         /* else  (error == EJUSTRETURN) { nothing } */
 177
 178         if (KTRPOINT(proc, KTR_SYSRET))
 179                 ktrsysret(proc, code, error, uthread->uu_rval[0], funnel_type);
 180
 181          exit_funnel_section();
 182
 183         if (kdebug_enable && (code != 180)) {
 184                 KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END,
 185                         error, uthread->uu_rval[0], uthread->uu_rval[1], 0, 0);
 186         }
 187
 188         thread_exception_return();
 189         /* NOTREACHED */
 190 }
 191
 192 unix_syscall_return(error)
 193 {
 194         thread_act_t                            thread_act;
 195         struct uthread                          *uthread;
 196         struct proc                                     *proc;
 197         struct savearea                         *regs;
 198         unsigned short                          code;
 199         struct sysent                           *callp;
 200         int funnel_type;
 201
 202         thread_act = current_act();
 203         proc = current_proc();
 204         uthread = get_bsdthread_info(thread_act);
 205
 206         regs = find_user_regs(thread_act);
 207
 208         /*
 209          * Get index into sysent table
 210          */
 211         if (error == ERESTART) {
 212                 regs->save_srr0 -= 8;
 213         } else if (error != EJUSTRETURN) {
 214                 if (error) {
 215                         regs->save_r3 = (long long)error;
 216                         /* set the "pc" to execute cerror routine */
 217                         regs->save_srr0 -= 4;
 218                 } else { /* (not error) */
 219                         regs->save_r3 = uthread->uu_rval[0];
 220                         regs->save_r4 = uthread->uu_rval[1];
 221                 }
 222         }
 223         /* else  (error == EJUSTRETURN) { nothing } */
 224
 225         if (regs->save_r0 != NULL)
 226                 code = regs->save_r0;
 227         else
 228                 code = regs->save_r3;
 229
 230         callp = (code >= nsysent) ? &sysent[63] : &sysent[code];
 231
 232         funnel_type = (int)callp->sy_funnel;
 233
 234         if (KTRPOINT(proc, KTR_SYSRET))
 235                 ktrsysret(proc, code, error, uthread->uu_rval[0], funnel_type);
 236
 237          exit_funnel_section();
 238
 239         if (kdebug_enable && (code != 180)) {
 240                 KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END,
 241                         error, uthread->uu_rval[0], uthread->uu_rval[1], 0, 0);
 242         }
 243
 244         thread_exception_return();
 245         /* NOTREACHED */
 246 }
 247
 248 /*
 249  * Time of day and interval timer support.
 250  *
 251  * These routines provide the kernel entry points to get and set
 252  * the time-of-day and per-process interval timers.  Subroutines
 253  * here provide support for adding and subtracting timeval structures
 254  * and decrementing interval timers, optionally reloading the interval
 255  * timers when they expire.
 256  */
 257 struct gettimeofday_args{
 258         struct timeval *tp;
 259         struct timezone *tzp;
 260 };
 261 /*  NOTE THIS implementation is for  ppc architectures only.
 262  *  It is infrequently called, since the commpage intercepts
 263  *  most calls in user mode.
 264  */
 265 int
 266 ppc_gettimeofday(p, uap, retval)
 267         struct proc *p;
 268         register struct gettimeofday_args *uap;
 269         register_t *retval;
 270 {
 271         int error = 0;
 272
 273         if (uap->tp)
 274                 clock_gettimeofday(&retval[0], &retval[1]);
 275
 276         if (uap->tzp) {
 277                 struct timezone ltz;
 278                 extern simple_lock_data_t tz_slock;
 279
 280                 usimple_lock(&tz_slock);
 281                 ltz = tz;
 282                 usimple_unlock(&tz_slock);
 283                 error = copyout((caddr_t)&ltz, (caddr_t)uap->tzp, sizeof (tz));
 284         }
 285
 286         return(error);
 287 }
 288