osfmk/ppc/bsd_ppc.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 #include <mach/mach_types.h>
  23 #include <mach/exception_types.h>
  24 #include <mach/error.h>
  25 #include <kern/counters.h>
  26 #include <kern/syscall_sw.h>
  27 #include <kern/task.h>
  28 #include <kern/thread.h>
  29 #include <ppc/thread.h>
  30 #include <kern/thread_act.h>
  31 #include <ppc/thread_act.h>
  32 #include <ppc/asm.h>
  33 #include <ppc/proc_reg.h>
  34 #include <ppc/trap.h>
  35 #include <ppc/exception.h>
  36 #include <kern/assert.h>
  37
  38 #include <sys/kdebug.h>
  39
  40 #define ERESTART        -1              /* restart syscall */
  41 #define EJUSTRETURN     -2              /* don't modify regs, just return */
  42
  43 struct unix_syscallargs {
  44         int flavor;
  45         int r3;
  46         int arg1, arg2,arg3,arg4,arg5,arg6,arg7,arg8,arg9;
  47 };
  48 struct sysent {         /* system call table */
  49         unsigned short          sy_narg;                /* number of args */
  50         char                    sy_parallel;    /* can execute in parallel */
  51         char                    sy_funnel;      /* funnel type */
  52         unsigned long           (*sy_call)(void *, void *, int *);      /* implementing function */
  53 };
  54
  55 #define KERNEL_FUNNEL 1
  56 #define NETWORK_FUNNEL 2
  57
  58 extern funnel_t * kernel_flock;
  59 extern funnel_t * network_flock;
  60
  61 extern struct sysent sysent[];
  62
  63 void  *get_bsdtask_info(
  64         task_t);
  65
  66 int set_bsduthreadargs (
  67         thread_act_t, struct pcb *,
  68         struct unix_syscallargs  *);
  69
  70 void * get_bsduthreadarg(
  71         thread_act_t);
  72
  73 void
  74 unix_syscall(
  75         struct pcb * pcb,
  76     int, int, int, int, int, int, int );
  77
  78 /*
  79  * Function:    unix_syscall
  80  *
  81  * Inputs:      pcb     - pointer to Process Control Block
  82  *              arg1    - arguments to mach system calls
  83  *              arg2
  84  *              arg3
  85  *              arg4
  86  *              arg5
  87  *              arg6
  88  *              arg7
  89  *
  90  * Outputs:     none
  91  */
  92 void
  93 unix_syscall(
  94     struct pcb * pcb,
  95     int arg1,
  96     int arg2,
  97     int arg3,
  98     int arg4,
  99     int arg5,
 100     int arg6,
 101     int arg7
 102     )
 103 {
 104     struct ppc_saved_state      *regs;
 105     thread_act_t                thread;
 106     struct sysent               *callp;
 107     int                         nargs, error;
 108     unsigned short              code;
 109     void *  p, *vt;
 110     int * vtint;
 111         int *rval;
 112         int funnel_type;
 113
 114         struct unix_syscallargs sarg;
 115         extern int nsysent;
 116
 117
 118     regs = &pcb->ss;
 119     code = regs->r0;
 120
 121     thread = current_act();
 122         p = current_proc();
 123         rval = (int *)get_bsduthreadrval(thread);
 124
 125     /*
 126     ** Get index into sysent table
 127     */
 128
 129
 130         /*
 131         ** Set up call pointer
 132         */
 133         callp = (code >= nsysent) ? &sysent[63] : &sysent[code];
 134
 135         sarg. flavor = (callp == sysent)? 1: 0;
 136         if (sarg.flavor) {
 137                 code = regs->r3;
 138                 callp = (code >= nsysent) ? &sysent[63] : &sysent[code];
 139
 140         }
 141         else
 142                 sarg. r3 = regs->r3;
 143
 144         if (code != 180) {
 145                 if (sarg.flavor)
 146                         KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START,
 147                                               arg1, arg2, arg3, arg4, 0);
 148                 else
 149                         KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START,
 150                                               sarg.r3, arg1, arg2, arg3, 0);
 151         }
 152         sarg. arg1 = arg1;
 153         sarg. arg2 = arg2;
 154         sarg. arg3 = arg3;
 155         sarg. arg4 = arg4;
 156         sarg. arg5 = arg5;
 157         sarg. arg6 = arg6;
 158         sarg. arg7 = arg7;
 159
 160         if(callp->sy_funnel == NETWORK_FUNNEL) {
 161             (void) thread_funnel_set(network_flock, TRUE);
 162            }
 163         else {
 164             (void) thread_funnel_set(kernel_flock, TRUE);
 165            }
 166
 167         set_bsduthreadargs(thread,pcb,&sarg);
 168
 169
 170         if (callp->sy_narg > 8)
 171         panic("unix_syscall: max arg count exceeded");
 172
 173         rval[0] = 0;
 174
 175         /* r4 is volatile, if we set it to regs->r4 here the child
 176          * will have parents r4 after execve */
 177         rval[1] = 0;
 178
 179         error = 0; /* Start with a good value */
 180
 181         /*
 182         ** the PPC runtime calls cerror after every unix system call, so
 183         ** assume no error and adjust the "pc" to skip this call.
 184         ** It will be set back to the cerror call if an error is detected.
 185         */
 186         regs->srr0 += 4;
 187         vt = get_bsduthreadarg(thread);
 188         counter_always(c_syscalls_unix++);
 189         current_task()->syscalls_unix++;
 190         error = (*(callp->sy_call))(p, (void *)vt, rval);
 191
 192         regs = find_user_regs(thread);
 193         if (regs == (struct ppc_saved_state  *)0)
 194                 panic("No user savearea while returning from system call");
 195
 196     if (error == ERESTART) {
 197         regs->srr0 -= 8;
 198     }
 199     else if (error != EJUSTRETURN) {
 200         if (error)
 201         {
 202             regs->r3 = error;
 203             /* set the "pc" to execute cerror routine */
 204             regs->srr0 -= 4;
 205         } else { /* (not error) */
 206             regs->r3 = rval[0];
 207             regs->r4 = rval[1];
 208         }
 209     }
 210     /* else  (error == EJUSTRETURN) { nothing } */
 211
 212     (void) thread_funnel_set(current_thread()->funnel_lock, FALSE);
 213
 214     if (code != 180) {
 215         KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END,
 216                        error, rval[0], rval[1], 0, 0);
 217     }
 218
 219     thread_exception_return();
 220     /* NOTREACHED */
 221 }
 222
 223 unix_syscall_return(error)
 224 {
 225     struct ppc_saved_state      *regs;
 226     thread_act_t                thread;
 227     struct sysent               *callp;
 228     int                         nargs;
 229     unsigned short              code;
 230         int *rval;
 231    void *  p, *vt;
 232     int * vtint;
 233         struct pcb *pcb;
 234
 235         struct unix_syscallargs sarg;
 236         extern int nsysent;
 237
 238     thread = current_act();
 239         p = current_proc();
 240         rval = (int *)get_bsduthreadrval(thread);
 241         pcb = thread->mact.pcb;
 242     regs = &pcb->ss;
 243
 244     if (thread_funnel_get() == THR_FUNNEL_NULL)
 245         panic("Unix syscall return without funnel held");
 246
 247     /*
 248     ** Get index into sysent table
 249     */
 250     code = regs->r0;
 251
 252     if (error == ERESTART) {
 253         regs->srr0 -= 8;
 254     }
 255     else if (error != EJUSTRETURN) {
 256         if (error)
 257         {
 258             regs->r3 = error;
 259             /* set the "pc" to execute cerror routine */
 260             regs->srr0 -= 4;
 261         } else { /* (not error) */
 262             regs->r3 = rval[0];
 263             regs->r4 = rval[1];
 264         }
 265     }
 266     /* else  (error == EJUSTRETURN) { nothing } */
 267
 268     (void) thread_funnel_set(current_thread()->funnel_lock, FALSE);
 269
 270     if (code != 180) {
 271           KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END,
 272                        error, rval[0], rval[1], 0, 0);
 273     }
 274
 275     thread_exception_return();
 276     /* NOTREACHED */
 277 }
 278