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Annotation of XNU/bsd/kern/kern_core.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: /* Copyright (c) 1991 NeXT Computer, Inc.  All rights reserved.
        !            23:  *
        !            24:  *     File:   bsd/kern/kern_core.c
        !            25:  *
        !            26:  *     This file contains machine independent code for performing core dumps.
        !            27:  *
        !            28:  * HISTORY
        !            29:  * 16-Feb-91  Mike DeMoney ([email protected])
        !            30:  *     Massaged into MI form from m68k/core.c.
        !            31:  */
        !            32: 
        !            33: #include <mach/vm_param.h>
        !            34: #include <mach/thread_status.h>
        !            35: 
        !            36: #include <sys/param.h>
        !            37: #include <sys/systm.h>
        !            38: #include <sys/signalvar.h>
        !            39: #include <sys/resourcevar.h>
        !            40: #include <sys/namei.h>
        !            41: #include <sys/vnode.h>
        !            42: #include <sys/proc.h>
        !            43: #include <sys/timeb.h>
        !            44: #include <sys/times.h>
        !            45: #include <sys/buf.h>
        !            46: #include <sys/acct.h>
        !            47: #include <sys/file.h>
        !            48: #include <sys/uio.h>
        !            49: #include <sys/kernel.h>
        !            50: #include <sys/stat.h>
        !            51: 
        !            52: #include <mach-o/loader.h>
        !            53: #include <mach/vm_region.h>
        !            54: 
        !            55: #include <vm/vm_kern.h>
        !            56: 
        !            57: typedef struct {
        !            58:        int     flavor;                 /* the number for this flavor */
        !            59:        int     count;                  /* count of ints in this flavor */
        !            60: } mythread_state_flavor_t;
        !            61: 
        !            62: #if defined (__ppc__)
        !            63: 
        !            64: mythread_state_flavor_t thread_flavor_array[]={
        !            65:                {PPC_THREAD_STATE , PPC_THREAD_STATE_COUNT},
        !            66:                {PPC_FLOAT_STATE, PPC_FLOAT_STATE_COUNT}, 
        !            67:                {PPC_EXCEPTION_STATE, PPC_EXCEPTION_STATE_COUNT}
        !            68:                };
        !            69: int mynum_flavors=3;
        !            70: #elif defined (__i386__)
        !            71: mythread_state_flavor_t thread_flavor_array [] = { 
        !            72:                {i386_THREAD_STATE, i386_THREAD_STATE_COUNT},
        !            73:                {i386_THREAD_FPSTATE, i386_THREAD_FPSTATE_COUNT},
        !            74:                {i386_THREAD_EXCEPTSTATE, i386_THREAD_EXCEPTSTATE_COUNT},
        !            75:                {i386_THREAD_CTHREADSTATE, i386_THREAD_CTHREADSTATE_COUNT},
        !            76:                {i386_NEW_THREAD_STATE, i386_NEW_THREAD_STATE_COUNT},
        !            77:                {i386_FLOAT_STATE, i386_FLOAT_STATE_COUNT},
        !            78:                {i386_ISA_PORT_MAP_STATE, i386_ISA_PORT_MAP_STATE_COUNT},
        !            79:                {i386_V86_ASSIST_STATE, i386_V86_ASSIST_STATE_COUNT},
        !            80:                {THREAD_SYSCALL_STATE, i386_THREAD_SYSCALL_STATE_COUNT}
        !            81:                };
        !            82: int mynum_flavors=9;
        !            83: 
        !            84: #else
        !            85: #error architecture not supported
        !            86: #endif
        !            87: 
        !            88: 
        !            89: typedef struct {
        !            90:        vm_offset_t header; 
        !            91:        int  hoffset;
        !            92:        mythread_state_flavor_t *flavors;
        !            93:        int tstate_size;
        !            94: } tir_t;
        !            95: 
        !            96: collectth_state(thread_act_t th_act, tir_t *t)
        !            97: {
        !            98:        vm_offset_t     header;
        !            99:        int  hoffset, i ;
        !           100:        mythread_state_flavor_t *flavors;
        !           101:        struct thread_command   *tc;
        !           102:                /*
        !           103:                 *      Fill in thread command structure.
        !           104:                 */
        !           105:                header = t->header;
        !           106:                hoffset = t->hoffset;
        !           107:                flavors = t->flavors;
        !           108:        
        !           109:                tc = (struct thread_command *) (header + hoffset);
        !           110:                tc->cmd = LC_THREAD;
        !           111:                tc->cmdsize = sizeof(struct thread_command)
        !           112:                                + t->tstate_size;
        !           113:                hoffset += sizeof(struct thread_command);
        !           114:                /*
        !           115:                 * Follow with a struct thread_state_flavor and
        !           116:                 * the appropriate thread state struct for each
        !           117:                 * thread state flavor.
        !           118:                 */
        !           119:                for (i = 0; i < mynum_flavors; i++) {
        !           120:                        *(mythread_state_flavor_t *)(header+hoffset) =
        !           121:                          flavors[i];
        !           122:                        hoffset += sizeof(mythread_state_flavor_t);
        !           123:                        thread_getstatus(th_act, flavors[i].flavor,
        !           124:                                        (thread_state_t *)(header+hoffset),
        !           125:                                        &flavors[i].count);
        !           126:                        hoffset += flavors[i].count*sizeof(int);
        !           127:                }
        !           128: 
        !           129:                t->hoffset = hoffset;
        !           130: }
        !           131: /*
        !           132:  * Create a core image on the file "core".
        !           133:  */
        !           134: #define        MAX_TSTATE_FLAVORS      10
        !           135: int
        !           136: coredump(p)
        !           137:        register struct proc *p;
        !           138: {
        !           139:        int error=0;
        !           140:        register struct pcred *pcred = p->p_cred;
        !           141:        register struct ucred *cred = pcred->pc_ucred;
        !           142:        struct nameidata nd;
        !           143:        struct vattr    vattr;
        !           144:        vm_map_t        map;
        !           145:        int             thread_count, segment_count;
        !           146:        int             command_size, header_size, tstate_size;
        !           147:        int             hoffset, foffset, vmoffset;
        !           148:        vm_offset_t     header;
        !           149:        struct machine_slot     *ms;
        !           150:        struct mach_header      *mh;
        !           151:        struct segment_command  *sc;
        !           152:        struct thread_command   *tc;
        !           153:        vm_size_t       size;
        !           154:        vm_prot_t       prot;
        !           155:        vm_prot_t       maxprot;
        !           156:        vm_inherit_t    inherit;
        !           157:        boolean_t       is_shared;
        !           158:        vm_offset_t     offset;
        !           159:        int             error1;
        !           160:        task_t          task;
        !           161:        char            core_name[MAXCOMLEN+6];
        !           162:        mythread_state_flavor_t flavors[MAX_TSTATE_FLAVORS];
        !           163:        vm_size_t       nflavors,mapsize;
        !           164:        int             i;
        !           165:        struct vm_region_basic_info vbr;
        !           166:        int vbrcount=0;
        !           167:        tir_t tir1;
        !           168:        struct vnode * vp;
        !           169: 
        !           170: 
        !           171:        if (pcred->p_svuid != pcred->p_ruid || pcred->p_svgid != pcred->p_rgid)
        !           172:                return (EFAULT);
        !           173: 
        !           174:        task = current_task();
        !           175:        map = current_map();
        !           176:        mapsize = get_vmmap_size(map);
        !           177: 
        !           178:        if (mapsize >=  p->p_rlimit[RLIMIT_CORE].rlim_cur)
        !           179:                return (EFAULT);
        !           180:        (void) task_suspend(task);
        !           181: 
        !           182:        /*
        !           183:         *      Make sure all registers, etc. are in pcb so they get
        !           184:         *      into core file.
        !           185:         */
        !           186: #if defined (__ppc__)
        !           187:        fpu_save();
        !           188: #endif
        !           189:        sprintf(core_name, "/cores/core.%d", p->p_pid);
        !           190:        NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, core_name, p);
        !           191:        if(error = vn_open(&nd, O_CREAT | FWRITE, S_IRUSR ))
        !           192:                return (error);
        !           193:        vp = nd.ni_vp;
        !           194:        
        !           195:        /* Don't dump to non-regular files or files with links. */
        !           196:        if (vp->v_type != VREG ||
        !           197:            VOP_GETATTR(vp, &vattr, cred, p) || vattr.va_nlink != 1) {
        !           198:                error = EFAULT;
        !           199:                goto out;
        !           200:        }
        !           201: 
        !           202:        VATTR_NULL(&vattr);
        !           203:        vattr.va_size = 0;
        !           204:        VOP_LEASE(vp, p, cred, LEASE_WRITE);
        !           205:        VOP_SETATTR(vp, &vattr, cred, p);
        !           206:        p->p_acflag |= ACORE;
        !           207: 
        !           208:        /*
        !           209:         *      If the task is modified while dumping the file
        !           210:         *      (e.g., changes in threads or VM, the resulting
        !           211:         *      file will not necessarily be correct.
        !           212:         */
        !           213: 
        !           214:        thread_count = get_task_numacts(task);
        !           215:        segment_count = get_vmmap_entries(map); /* XXX */
        !           216:        /*
        !           217:         * nflavors here is really the number of ints in flavors
        !           218:         * to meet the thread_getstatus() calling convention
        !           219:         */
        !           220: #if 0
        !           221:        nflavors = sizeof(flavors)/sizeof(int);
        !           222:        if (thread_getstatus(current_thread(), THREAD_STATE_FLAVOR_LIST,
        !           223:                                (thread_state_t)(flavors),
        !           224:                                 &nflavors) != KERN_SUCCESS)
        !           225:            panic("core flavor list");
        !           226:        /* now convert to number of flavors */
        !           227:        nflavors /= sizeof(mythread_state_flavor_t)/sizeof(int);
        !           228: #else
        !           229:        nflavors = mynum_flavors;
        !           230:        bcopy(thread_flavor_array,flavors,sizeof(thread_flavor_array));
        !           231: #endif
        !           232:        tstate_size = 0;
        !           233:        for (i = 0; i < nflavors; i++)
        !           234:                tstate_size += sizeof(mythread_state_flavor_t) +
        !           235:                  (flavors[i].count * sizeof(int));
        !           236: 
        !           237:        command_size = segment_count*sizeof(struct segment_command) +
        !           238:          thread_count*sizeof(struct thread_command) +
        !           239:          tstate_size*thread_count;
        !           240: 
        !           241:        header_size = command_size + sizeof(struct mach_header);
        !           242: 
        !           243:        (void) kmem_alloc_wired(kernel_map,
        !           244:                                    (vm_offset_t *)&header,
        !           245:                                    (vm_size_t)header_size);
        !           246: 
        !           247:        /*
        !           248:         *      Set up Mach-O header.
        !           249:         */
        !           250:        mh = (struct mach_header *) header;
        !           251:        ms = &machine_slot[cpu_number()];
        !           252:        mh->magic = MH_MAGIC;
        !           253:        mh->cputype = ms->cpu_type;
        !           254:        mh->cpusubtype = ms->cpu_subtype;
        !           255:        mh->filetype = MH_CORE;
        !           256:        mh->ncmds = segment_count + thread_count;
        !           257:        mh->sizeofcmds = command_size;
        !           258: 
        !           259:        hoffset = sizeof(struct mach_header);   /* offset into header */
        !           260:        foffset = round_page(header_size);      /* offset into file */
        !           261:        vmoffset = VM_MIN_ADDRESS;              /* offset into VM */
        !           262:        /* We use to check for an error, here, now we try and get 
        !           263:         * as much as we can
        !           264:         */
        !           265:        while (segment_count > 0){
        !           266:                vbrcount = VM_REGION_BASIC_INFO_COUNT;
        !           267:                /*
        !           268:                 *      Get region information for next region.
        !           269:                 */
        !           270:                if (vm_region(map, &vmoffset, &size, VM_REGION_BASIC_INFO, &vbr, &vbrcount,0) != KERN_SUCCESS)
        !           271:                        break;
        !           272:                prot = vbr.protection;
        !           273:                maxprot = vbr.max_protection;
        !           274:                inherit = vbr.inheritance;
        !           275:                is_shared = vbr.shared;
        !           276:                /*
        !           277:                 *      Fill in segment command structure.
        !           278:                 */
        !           279:                sc = (struct segment_command *) (header + hoffset);
        !           280:                sc->cmd = LC_SEGMENT;
        !           281:                sc->cmdsize = sizeof(struct segment_command);
        !           282:                /* segment name is zerod by kmem_alloc */
        !           283:                sc->vmaddr = vmoffset;
        !           284:                sc->vmsize = size;
        !           285:                sc->fileoff = foffset;
        !           286:                sc->filesize = size;
        !           287:                sc->maxprot = maxprot;
        !           288:                sc->initprot = prot;
        !           289:                sc->nsects = 0;
        !           290: 
        !           291:                /*
        !           292:                 *      Write segment out.  Try as hard as possible to
        !           293:                 *      get read access to the data.
        !           294:                 */
        !           295:                if ((prot & VM_PROT_READ) == 0) {
        !           296:                        vm_protect(map, vmoffset, size, FALSE,
        !           297:                                   prot|VM_PROT_READ);
        !           298:                }
        !           299:                /*
        !           300:                 *      Only actually perform write if we can read.
        !           301:                 *      Note: if we can't read, then we end up with
        !           302:                 *      a hole in the file.
        !           303:                 */
        !           304:                if ((maxprot & VM_PROT_READ) == VM_PROT_READ) {
        !           305:                        error = vn_rdwr(UIO_WRITE, vp, (caddr_t)vmoffset, size, foffset,
        !           306:                                UIO_USERSPACE, IO_NODELOCKED|IO_UNIT, cred, (int *) 0, p);
        !           307:                }
        !           308: 
        !           309:                hoffset += sizeof(struct segment_command);
        !           310:                foffset += size;
        !           311:                vmoffset += size;
        !           312:                segment_count--;
        !           313:        }
        !           314: 
        !           315: #if 0 /* [ */
        !           316:        task_lock(task);
        !           317:        thread = (thread_t) queue_first(&task->thread_list);
        !           318:        while (thread_count > 0) {
        !           319:                /*
        !           320:                 *      Fill in thread command structure.
        !           321:                 */
        !           322:                tc = (struct thread_command *) (header + hoffset);
        !           323:                tc->cmd = LC_THREAD;
        !           324:                tc->cmdsize = sizeof(struct thread_command)
        !           325:                                + tstate_size;
        !           326:                hoffset += sizeof(struct thread_command);
        !           327:                /*
        !           328:                 * Follow with a struct thread_state_flavor and
        !           329:                 * the appropriate thread state struct for each
        !           330:                 * thread state flavor.
        !           331:                 */
        !           332:                for (i = 0; i < nflavors; i++) {
        !           333:                        *(mythread_state_flavor_t *)(header+hoffset) =
        !           334:                          flavors[i];
        !           335:                        hoffset += sizeof(mythread_state_flavor_t);
        !           336:                        thread_getstatus(thread, flavors[i].flavor,
        !           337:                                        (thread_state_t *)(header+hoffset),
        !           338:                                        &flavors[i].count);
        !           339:                        hoffset += flavors[i].count*sizeof(int);
        !           340:                }
        !           341:                thread = (thread_t) queue_next(&thread->thread_list);
        !           342:                thread_count--;
        !           343:        }
        !           344:        task_unlock(task);
        !           345: #else /* /* 0 ][ */
        !           346:        tir1.header = header;
        !           347:        tir1.hoffset = hoffset;
        !           348:        tir1.flavors = flavors;
        !           349:        tir1.tstate_size = tstate_size;
        !           350:        task_act_iterate_wth_args(task, collectth_state,&tir1);
        !           351: 
        !           352: #endif /* 0 ] */
        !           353:        /*
        !           354:         *      Write out the Mach header at the beginning of the
        !           355:         *      file.
        !           356:         */
        !           357:        error = vn_rdwr(UIO_WRITE, vp, (caddr_t)header, header_size, (off_t)0,
        !           358:                        UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, cred, (int *) 0, p);
        !           359:        kmem_free(kernel_map, header, header_size);
        !           360: out:
        !           361:        VOP_UNLOCK(vp, 0, p);
        !           362:        error1 = vn_close(vp, FWRITE, cred, p);
        !           363:        if (error == 0)
        !           364:                error = error1;
        !           365: }

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