Return to systemcalls.c CVS log

Up to [Apple XNU] / XNU / bsd / dev / ppc

Annotation of XNU/bsd/dev/ppc/systemcalls.c, revision 1.1

1.1     ! root        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: /*
        !            23:  * Copyright (c) 1997 Apple Computer, Inc.
        !            24:  *
        !            25:  * PowerPC Family:     System Call handlers.
        !            26:  *
        !            27:  * HISTORY
        !            28:  * 27-July-97  A. Ramesh  
        !            29:  *     Adopted for Common Core.
        !            30:  */
        !            31:  
        !            32: #include <mach/mach_types.h>
        !            33: #include <mach/error.h>
        !            34: 
        !            35: #include <kern/syscall_sw.h>
        !            36: #include <kern/kdp.h>
        !            37: 
        !            38: #include <machdep/ppc/frame.h>
        !            39: #include <machdep/ppc/thread.h>
        !            40: #include <machdep/ppc/asm.h>
        !            41: #include <machdep/ppc/proc_reg.h>
        !            42: #include <machdep/ppc/trap.h>
        !            43: #include <machdep/ppc/exception.h>
        !            44: 
        !            45: 
        !            46: #define        ERESTART        -1              /* restart syscall */
        !            47: #define        EJUSTRETURN     -2              /* don't modify regs, just return */
        !            48: 
        !            49: 
        !            50: struct unix_syscallargs {
        !            51:        int flavor;
        !            52:        int r3;
        !            53:        int arg1, arg2,arg3,arg4,arg5,arg6,arg7,arg8,arg9;
        !            54: };
        !            55: extern struct sysent {         /* system call table */
        !            56:        int16_t         sy_narg;        /* number of args */
        !            57:        int16_t         sy_parallel;/* can execute in parallel */
        !            58:        int32_t         (*sy_call)();   /* implementing function */
        !            59: } sysent[];
        !            60: 
        !            61: /*
        !            62: ** Function:   unix_syscall
        !            63: **
        !            64: ** Inputs:     pcb     - pointer to Process Control Block
        !            65: **             arg1    - arguments to mach system calls
        !            66: **             arg2
        !            67: **             arg3
        !            68: **             arg4
        !            69: **             arg5
        !            70: **             arg6
        !            71: **             arg7
        !            72: **
        !            73: ** Outputs:    none
        !            74: */
        !            75: void
        !            76: unix_syscall(
        !            77:     struct pcb * pcb,
        !            78:     int arg1,
        !            79:     int arg2,
        !            80:     int arg3,
        !            81:     int arg4,
        !            82:     int arg5,
        !            83:     int arg6,
        !            84:     int arg7 
        !            85:     )
        !            86: {
        !            87:     struct ppc_saved_state     *regs;
        !            88:     thread_t                   thread;
        !            89:     struct proc                        *p;
        !            90:    struct sysent               *callp;
        !            91:     int                                nargs, error;
        !            92:     unsigned short             code;
        !            93:     int                                rval[2];
        !            94:        struct unix_syscallargs sarg;
        !            95: 
        !            96:     if (!USERMODE(pcb->ss.srr1))
        !            97:        panic("unix_syscall");
        !            98: 
        !            99:     regs = &pcb->ss;
        !           100:     thread = current_thread();
        !           101: 
        !           102: 
        !           103:     /*
        !           104:     ** Get index into sysent table
        !           105:     */   
        !           106:     code = regs->r0;
        !           107: 
        !           108:     
        !           109:        /*
        !           110:        ** Set up call pointer
        !           111:        */
        !           112:        callp = (code >= nsysent) ? &sysent[63] : &sysent[code];
        !           113: 
        !           114:        sarg. flavor = (callp == sysent): 1: 0;
        !           115:        sarg. r3 = regs->r3;
        !           116:        sarg. arg1 = arg1;
        !           117:        sarg. arg2 = arg2;
        !           118:        sarg. arg3 = arg3;
        !           119:        sarg. arg4 = arg4;
        !           120:        sarg. arg5 = arg5;
        !           121:        sarg. arg6 = arg6;
        !           122:        sarg. arg7 = arg7;
        !           123: 
        !           124:     set_bsduthreadargs(thread,pcb,&sarg);
        !           125: 
        !           126: 
        !           127:        if (callp->sy_narg > 8)
        !           128:        panic("unix_syscall: max arg count exceeded");
        !           129: 
        !           130:        rval[0] = 0;
        !           131: 
        !           132:        /* r4 is volatile, if we set it to regs->r4 here the child
        !           133:         * will have parents r4 after execve */
        !           134:        rval[1] = 0;
        !           135: 
        !           136:        error = 0; /* Start with a good value */
        !           137: 
        !           138:        /*
        !           139:        ** the PPC runtime calls cerror after every unix system call, so
        !           140:        ** assume no error and adjust the "pc" to skip this call.
        !           141:        ** It will be set back to the cerror call if an error is detected.
        !           142:        */
        !           143:        regs->srr0 += 4;
        !           144:        vt = get_bsduthreadarg(thread);
        !           145:        p = ((struct proc *)get_bsdtask_info(current_task()));
        !           146:        error = (*(callp->sy_call))(p, (caddr_t)vt, rval);
        !           147: 
        !           148:     if (error == ERESTART) {
        !           149:        regs->srr0 -= 8;
        !           150:     }
        !           151:     else if (error != EJUSTRETURN) {
        !           152:        if (error)
        !           153:        {
        !           154:            regs->r3 = error;
        !           155:            /* set the "pc" to execute cerror routine */
        !           156:            regs->srr0 -= 4;
        !           157:        } else { /* (not error) */
        !           158:            regs->r3 = rval[0];
        !           159:            regs->r4 = rval[1];
        !           160:        } 
        !           161:     }
        !           162:     /* else  (error == EJUSTRETURN) { nothing } */
        !           163: 
        !           164:     thread_exception_return();
        !           165:     /* NOTREACHED */
        !           166:        
        !           167: }
        !           168: 

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.