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Annotation of kernel/bsd/kern/kern_symfile.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /* Copyright (c) 1998 Apple Computer, Inc.  All rights reserved.
        !            26:  *
        !            27:  *     File:   bsd/kern/kern_symfile.c
        !            28:  *
        !            29:  *     This file contains creates a dummy symbol file for mach_kernel based on
        !            30:  *      the symbol table information passed by the SecondaryLoader/PlatformExpert.
        !            31:  *      This allows us to correctly link other executables (drivers, etc) against the 
        !            32:  *      the kernel in cases where the kernel image on the root device does not match
        !            33:  *      the live kernel. This can occur during net-booting where the actual kernel
        !            34:  *      image is obtained from the network via tftp rather than the root
        !            35:  *      device.
        !            36:  *
        !            37:  *      If a symbol table is available, then the file /mach.sym will be created
        !            38:  *      containing a Mach Header and a LC_SYMTAB load command followed by the
        !            39:  *      the symbol table data for mach_kernel.
        !            40:  *
        !            41:  * HISTORY
        !            42:  * 
        !            43:  *     .
        !            44:  */
        !            45: #import <cputypes.h>
        !            46: #import <mach_host.h>
        !            47: 
        !            48: #import <mach/vm_param.h>
        !            49: 
        !            50: #import <machine/cpu.h>
        !            51: 
        !            52: #include <sys/param.h>
        !            53: #include <sys/systm.h>
        !            54: #include <sys/signalvar.h>
        !            55: #include <sys/resourcevar.h>
        !            56: #include <sys/namei.h>
        !            57: #include <sys/vnode.h>
        !            58: #include <sys/proc.h>
        !            59: #include <sys/timeb.h>
        !            60: #include <sys/times.h>
        !            61: #include <sys/buf.h>
        !            62: #include <sys/acct.h>
        !            63: #include <sys/file.h>
        !            64: #include <sys/uio.h>
        !            65: #include <sys/kernel.h>
        !            66: #include <sys/stat.h>
        !            67: 
        !            68: #import <mach-o/loader.h>
        !            69: #import <mach-o/nlist.h>
        !            70: #import <vm/vm_kern.h>
        !            71: 
        !            72: void                   *symbol_table_addr;                     // Initialized by PlatformExpert.
        !            73: extern unsigned char   rootdevice[];
        !            74: 
        !            75: /*
        !            76:  * 
        !            77:  */
        !            78: int output_kernel_symbols( register struct proc *p )
        !            79: {
        !            80:        register struct vnode           *vp;
        !            81:        register struct pcred           *pcred = p->p_cred;
        !            82:        register struct ucred           *cred = pcred->pc_ucred;
        !            83:        struct nameidata                nd;
        !            84:        struct vattr                    vattr;
        !            85:        int                             command_size, header_size;
        !            86:        int                             hoffset, foffset;
        !            87:        vm_offset_t                     header;
        !            88:        struct machine_slot             *ms;
        !            89:        struct mach_header              *mh;
        !            90:        struct symtab_command           *sc, *sc0;
        !            91:         struct nlist                    *nl;
        !            92:        vm_size_t                       size;
        !            93:        int                             error, error1;
        !            94:         int                            i;
        !            95: 
        !            96:         if ( symbol_table_addr == NULL )
        !            97:                 return (EFAULT);
        !            98: 
        !            99:        if ( pcred->p_svuid != pcred->p_ruid || pcred->p_svgid != pcred->p_rgid )
        !           100:                return (EFAULT);
        !           101: 
        !           102:         if ( rootdevice[0] == 'e' || rootdevice[1] == 'n' )
        !           103:                 return (EROFS);
        !           104: 
        !           105:        NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "mach.sym", p);
        !           106:        if( (error = vn_open(&nd, O_CREAT | FWRITE, S_IRUSR | S_IRGRP | S_IROTH )) != 0 )
        !           107:                return (error);
        !           108:        vp = nd.ni_vp;
        !           109:        
        !           110:        /* Don't dump to non-regular files or files with links. */
        !           111:        if (vp->v_type != VREG ||
        !           112:            VOP_GETATTR(vp, &vattr, cred, p) || vattr.va_nlink != 1) {
        !           113:                error = EFAULT;
        !           114:                goto out;
        !           115:        }
        !           116: 
        !           117:        VATTR_NULL(&vattr);
        !           118:        vattr.va_size = 0;
        !           119:        VOP_LEASE(vp, p, cred, LEASE_WRITE);
        !           120:        VOP_SETATTR(vp, &vattr, cred, p);
        !           121:        p->p_acflag |= ACORE;
        !           122: 
        !           123:        command_size = sizeof(struct symtab_command);
        !           124:        header_size = command_size + sizeof(struct mach_header);
        !           125: 
        !           126:        (void) kmem_alloc_wired(kernel_map,
        !           127:                                    (vm_offset_t *)&header,
        !           128:                                    (vm_size_t)header_size);
        !           129: 
        !           130:        /*
        !           131:         *      Set up Mach-O header.
        !           132:         */
        !           133:        mh = (struct mach_header *) header;
        !           134:        ms = &machine_slot[cpu_number()];
        !           135:        mh->magic = MH_MAGIC;
        !           136:        mh->cputype = ms->cpu_type;
        !           137:        mh->cpusubtype = ms->cpu_subtype;
        !           138:        mh->filetype = MH_CORE;
        !           139:        mh->ncmds = 1;
        !           140:        mh->sizeofcmds = command_size;
        !           141: 
        !           142:        hoffset = sizeof(struct mach_header);   /* offset into header */
        !           143:        foffset = round_page(header_size);      /* offset into file */
        !           144: 
        !           145:        /*
        !           146:         *      Fill in segment command structure.
        !           147:         */
        !           148:         sc0         = (struct symtab_command *)  symbol_table_addr;
        !           149:        sc          = (struct symtab_command *) (header + hoffset);
        !           150:        sc->cmd     = LC_SYMTAB;
        !           151:        sc->cmdsize = sizeof(struct symtab_command);
        !           152:         sc->symoff  = foffset;
        !           153:         sc->nsyms   = sc0->nsyms;
        !           154:         sc->strsize = sc0->strsize;
        !           155:         sc->stroff =  foffset + sc->nsyms * sizeof(struct nlist);    
        !           156: 
        !           157:         size = sc->nsyms * sizeof(struct nlist) + sc->strsize;
        !           158: 
        !           159:         nl = (struct nlist *)(sc0+1);
        !           160:         for (i = 0; i < sc->nsyms; i++, nl++ )
        !           161:         {
        !           162:             if ( (nl->n_type & N_TYPE) == N_SECT )
        !           163:             {
        !           164:                 nl->n_sect = NO_SECT;
        !           165:                 nl->n_type = (nl->n_type & ~N_TYPE) | N_ABS;
        !           166:             }
        !           167:         }
        !           168: 
        !           169:        /*
        !           170:         *      Write out the Mach header at the beginning of the
        !           171:         *      file.
        !           172:         */
        !           173:        error = vn_rdwr(UIO_WRITE, vp, (caddr_t)header, header_size, (off_t)0,
        !           174:                        UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, cred, (int *) 0, p);
        !           175: 
        !           176:         /*
        !           177:          *     Write out kernel symbols
        !           178:          */
        !           179:         if ( !error )
        !           180:         {
        !           181:            error = vn_rdwr(UIO_WRITE, vp, (caddr_t)(sc0+1), size, foffset,
        !           182:                            UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, cred, (int *) 0, p);
        !           183: 
        !           184:         }
        !           185: 
        !           186:        kmem_free(kernel_map, header, header_size);
        !           187: out:
        !           188:        VOP_UNLOCK(vp, 0, p);
        !           189:        error1 = vn_close(vp, FWRITE, cred, p);
        !           190:        if (error == 0)
        !           191:                error = error1;
        !           192:        return(error);
        !           193: }

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