bsd/kern/mach_fat.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 /* Copyright (c) 1991 NeXT Computer, Inc.  All rights reserved.
  23  *
  24  *      File:   kern/mach_fat.c
  25  *      Author: Peter King
  26  *
  27  *      Fat file support routines.
  28  *
  29  */
  30
  31 #include <sys/param.h>
  32 #include <sys/types.h>
  33 #include <sys/uio.h>
  34 #include <sys/vnode.h>
  35 #include <vm/vm_kern.h>
  36 #include <mach/kern_return.h>
  37 #include <mach/vm_param.h>
  38 #include <kern/cpu_number.h>
  39 #include <mach-o/fat.h>
  40 #include <kern/mach_loader.h>
  41 #include <architecture/byte_order.h>
  42
  43 /* XXX should be in common header */
  44 extern int grade_binary(cpu_type_t exectype, cpu_subtype_t execsubtype);
  45
  46 #define CPU_TYPE_NATIVE         (cpu_type())
  47 #define CPU_TYPE_CLASSIC        CPU_TYPE_POWERPC
  48
  49 /**********************************************************************
  50  * Routine:     fatfile_getarch2()
  51  *
  52  * Function:    Locate the architecture-dependant contents of a fat
  53  *              file that match this CPU.
  54  *
  55  * Args:        vp:             The vnode for the fat file.
  56  *              header:         A pointer to the fat file header.
  57  *              req_cpu_type:   The required cpu type.
  58  *              mask_bits:      Bits to mask from the sub-image type when
  59  *                              grading it vs. the req_cpu_type
  60  *              archret (out):  Pointer to fat_arch structure to hold
  61  *                              the results.
  62  *
  63  * Returns:     KERN_SUCCESS:   Valid architecture found.
  64  *              KERN_FAILURE:   No valid architecture found.
  65  **********************************************************************/
  66 static load_return_t
  67 fatfile_getarch2(
  68 #if 0
  69         struct vnode    *vp,
  70 #else
  71         __unused struct vnode   *vp,
  72 #endif
  73         vm_offset_t     data_ptr,
  74         cpu_type_t      req_cpu_type,
  75         cpu_type_t      mask_bits,
  76         struct fat_arch *archret)
  77 {
  78         /* vm_pager_t           pager; */
  79         vm_offset_t             addr;
  80         vm_size_t               size;
  81         load_return_t           lret;
  82         struct fat_arch         *arch;
  83         struct fat_arch         *best_arch;
  84         int                     grade;
  85         int                     best_grade;
  86         int                     nfat_arch;
  87         int                     end_of_archs;
  88         struct fat_header       *header;
  89 #if 0
  90         off_t filesize;
  91 #endif
  92
  93         /*
  94          *      Get the pager for the file.
  95          */
  96
  97         header = (struct fat_header *)data_ptr;
  98
  99         /*
 100          *      Map portion that must be accessible directly into
 101          *      kernel's map.
 102          */
 103         nfat_arch = NXSwapBigLongToHost(header->nfat_arch);
 104
 105         end_of_archs = sizeof(struct fat_header)
 106                 + nfat_arch * sizeof(struct fat_arch);
 107 #if 0
 108         filesize = ubc_getsize(vp);
 109         if (end_of_archs > (int)filesize) {
 110                 return(LOAD_BADMACHO);
 111         }
 112 #endif
 113
 114         /* This is beacuse we are reading only 512 bytes */
 115
 116         if (end_of_archs > 512)
 117                 return(LOAD_BADMACHO);
 118         /*
 119          *      Round size of fat_arch structures up to page boundry.
 120          */
 121         size = round_page_32(end_of_archs);
 122         if (size == 0)
 123                 return(LOAD_BADMACHO);
 124
 125         /*
 126          * Scan the fat_arch's looking for the best one.
 127          */
 128         addr = data_ptr;
 129         best_arch = NULL;
 130         best_grade = 0;
 131         arch = (struct fat_arch *) (addr + sizeof(struct fat_header));
 132         for (; nfat_arch-- > 0; arch++) {
 133
 134                 /*
 135                  *      Check to see if right cpu type.
 136                  */
 137                 if(((cpu_type_t)NXSwapBigIntToHost(arch->cputype) & ~mask_bits) != req_cpu_type)
 138                         continue;
 139
 140                 /*
 141                  *      Get the grade of the cpu subtype.
 142                  */
 143                 grade = grade_binary(
 144                             NXSwapBigIntToHost(arch->cputype),
 145                             NXSwapBigIntToHost(arch->cpusubtype));
 146
 147                 /*
 148                  *      Remember it if it's the best we've seen.
 149                  */
 150                 if (grade > best_grade) {
 151                         best_grade = grade;
 152                         best_arch = arch;
 153                 }
 154         }
 155
 156         /*
 157          *      Return our results.
 158          */
 159         if (best_arch == NULL) {
 160                 lret = LOAD_BADARCH;
 161         } else {
 162                 archret->cputype        =
 163                             NXSwapBigIntToHost(best_arch->cputype);
 164                 archret->cpusubtype     =
 165                             NXSwapBigIntToHost(best_arch->cpusubtype);
 166                 archret->offset         =
 167                             NXSwapBigLongToHost(best_arch->offset);
 168                 archret->size           =
 169                             NXSwapBigLongToHost(best_arch->size);
 170                 archret->align          =
 171                             NXSwapBigLongToHost(best_arch->align);
 172
 173                 lret = LOAD_SUCCESS;
 174         }
 175
 176         /*
 177          * Free the memory we allocated and return.
 178          */
 179         return(lret);
 180 }
 181
 182 extern char classichandler[];
 183
 184 load_return_t
 185 fatfile_getarch_affinity(
 186                 struct vnode            *vp,
 187                 vm_offset_t             data_ptr,
 188                 struct fat_arch *archret,
 189                 int                             affinity)
 190 {
 191                 load_return_t lret;
 192                 int handler = (classichandler[0] != 0);
 193                 cpu_type_t primary_type, fallback_type;
 194
 195                 if (handler && affinity) {
 196                                 primary_type = CPU_TYPE_CLASSIC;
 197                                 fallback_type = CPU_TYPE_NATIVE;
 198                 } else {
 199                                 primary_type = CPU_TYPE_NATIVE;
 200                                 fallback_type = CPU_TYPE_CLASSIC;
 201                 }
 202                 /*
 203                  * Ignore the architectural bits when determining if an image
 204                  * in a fat file should be skipped or graded.
 205                  */
 206                 lret = fatfile_getarch2(vp, data_ptr, primary_type, CPU_ARCH_MASK, archret);
 207                 if ((lret != 0) && handler) {
 208                         lret = fatfile_getarch2(vp, data_ptr, fallback_type,
 209                                                 0, archret);
 210                 }
 211                 return lret;
 212 }
 213
 214 /**********************************************************************
 215  * Routine:     fatfile_getarch()
 216  *
 217  * Function:    Locate the architecture-dependant contents of a fat
 218  *              file that match this CPU.
 219  *
 220  * Args:        vp:             The vnode for the fat file.
 221  *              header:         A pointer to the fat file header.
 222  *              archret (out):  Pointer to fat_arch structure to hold
 223  *                              the results.
 224  *
 225  * Returns:     KERN_SUCCESS:   Valid architecture found.
 226  *              KERN_FAILURE:   No valid architecture found.
 227  **********************************************************************/
 228 load_return_t
 229 fatfile_getarch(
 230         struct vnode            *vp,
 231         vm_offset_t     data_ptr,
 232         struct fat_arch         *archret)
 233 {
 234         return fatfile_getarch2(vp, data_ptr, CPU_TYPE_NATIVE, 0, archret);
 235 }
 236
 237 /**********************************************************************
 238  * Routine:     fatfile_getarch_with_bits()
 239  *
 240  * Function:    Locate the architecture-dependant contents of a fat
 241  *              file that match this CPU.
 242  *
 243  * Args:        vp:             The vnode for the fat file.
 244  *              archbits:       Architecture specific feature bits
 245  *              header:         A pointer to the fat file header.
 246  *              archret (out):  Pointer to fat_arch structure to hold
 247  *                              the results.
 248  *
 249  * Returns:     KERN_SUCCESS:   Valid architecture found.
 250  *              KERN_FAILURE:   No valid architecture found.
 251  **********************************************************************/
 252 load_return_t
 253 fatfile_getarch_with_bits(
 254         struct vnode            *vp,
 255         integer_t               archbits,
 256         vm_offset_t     data_ptr,
 257         struct fat_arch         *archret)
 258 {
 259         return fatfile_getarch2(vp, data_ptr, archbits | CPU_TYPE_NATIVE, 0, archret);
 260 }
 261