1 | /*␊ |
2 | * Copyright (c) 2003 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 2.0 (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 | * load.c - Functions for decoding a Mach-o Kernel.␊ |
24 | *␊ |
25 | * Copyright (c) 1998-2003 Apple Computer, Inc.␊ |
26 | *␊ |
27 | */␊ |
28 | ␊ |
29 | #include <mach-o/fat.h>␊ |
30 | #include <mach-o/loader.h>␊ |
31 | #include <mach/machine/thread_status.h>␊ |
32 | ␊ |
33 | #include <sl.h>␊ |
34 | ␊ |
35 | /*␊ |
36 | * Backward compatibility fix for the SDK 10.7 version of loader.h␊ |
37 | */␊ |
38 | ␊ |
39 | #ifndef LC_MAIN␊ |
40 | ␉#define LC_MAIN (0x28|LC_REQ_DYLD) /* replacement for LC_UNIXTHREAD */␊ |
41 | #endif␊ |
42 | ␊ |
43 | ␊ |
44 | static long DecodeSegment(long cmdBase, unsigned int*load_addr, unsigned int *load_size);␊ |
45 | static long DecodeUnixThread(long cmdBase, unsigned int *entry);␊ |
46 | static long DecodeSymbolTable(long cmdBase);␊ |
47 | ␊ |
48 | ␊ |
49 | static unsigned long gBinaryAddress;␊ |
50 | bool gHaveKernelCache;␉␉␉/* XXX aserebln: uninitialized? and only set to true, never to false */␊ |
51 | cpu_type_t archCpuType=CPU_TYPE_I386;␊ |
52 | ␊ |
53 | ␊ |
54 | //==============================================================================␊ |
55 | // Public function.␊ |
56 | ␊ |
57 | long ThinFatFile(void **binary, unsigned long *length)␊ |
58 | {␊ |
59 | ␉unsigned long nfat, swapped, size = 0;␊ |
60 | ␉struct fat_header *fhp = (struct fat_header *)*binary;␊ |
61 | ␉struct fat_arch *fap = (struct fat_arch *)((unsigned long)*binary + sizeof(struct fat_header));␊ |
62 | ␉cpu_type_t fapcputype;␊ |
63 | ␉uint32_t fapoffset;␊ |
64 | ␉uint32_t fapsize;␉␊ |
65 | ␊ |
66 | ␉if (fhp->magic == FAT_MAGIC)␊ |
67 | ␉{␊ |
68 | ␉␉nfat = fhp->nfat_arch;␊ |
69 | ␉␉swapped = 0;␊ |
70 | ␉}␊ |
71 | ␉else if (fhp->magic == FAT_CIGAM)␊ |
72 | ␉{␊ |
73 | ␉␉nfat = OSSwapInt32(fhp->nfat_arch);␊ |
74 | ␉␉swapped = 1;␊ |
75 | ␉}␊ |
76 | ␉else␊ |
77 | ␉{␊ |
78 | ␉␉return -1;␊ |
79 | ␉}␊ |
80 | ␊ |
81 | ␉for (; nfat > 0; nfat--, fap++)␊ |
82 | ␉{␊ |
83 | ␉␉if (swapped)␊ |
84 | ␉␉{␊ |
85 | ␉␉␉fapcputype = OSSwapInt32(fap->cputype);␊ |
86 | ␉␉␉fapoffset = OSSwapInt32(fap->offset);␊ |
87 | ␉␉␉fapsize = OSSwapInt32(fap->size);␊ |
88 | ␉␉}␊ |
89 | ␉␉else␊ |
90 | ␉␉{␊ |
91 | ␉␉␉fapcputype = fap->cputype;␊ |
92 | ␉␉␉fapoffset = fap->offset;␊ |
93 | ␉␉␉fapsize = fap->size;␊ |
94 | ␉␉}␊ |
95 | ␊ |
96 | ␉␉if (fapcputype == archCpuType)␊ |
97 | ␉␉{␊ |
98 | ␉␉␉*binary = (void *) ((unsigned long)*binary + fapoffset);␊ |
99 | ␉␉␉size = fapsize;␊ |
100 | ␉␉␉break;␊ |
101 | ␉␉}␊ |
102 | ␉}␊ |
103 | ␊ |
104 | ␉if (length != 0)␊ |
105 | ␉{␊ |
106 | ␉␉*length = size;␊ |
107 | ␉}␊ |
108 | ␊ |
109 | ␉return 0;␊ |
110 | }␊ |
111 | ␊ |
112 | ␊ |
113 | //==============================================================================␊ |
114 | ␊ |
115 | long DecodeMachO(void *binary, entry_t *rentry, char **raddr, int *rsize)␊ |
116 | {␊ |
117 | ␉struct mach_header *mH;␊ |
118 | ␉unsigned long ncmds, cmdBase, cmd, cmdsize, cmdstart;␊ |
119 | ␉// long headerBase, headerAddr, headerSize;␊ |
120 | ␉unsigned int vmaddr = ~0;␊ |
121 | ␉unsigned int vmend = 0;␊ |
122 | ␉unsigned long cnt;␊ |
123 | ␉long ret = -1;␊ |
124 | ␉unsigned int entry = 0;␊ |
125 | ␊ |
126 | ␉gBinaryAddress = (unsigned long)binary;␊ |
127 | ␉mH = (struct mach_header *)(gBinaryAddress);␊ |
128 | ␊ |
129 | #if DEBUG␊ |
130 | ␉printf("magic: %x\n", (unsigned)mH->magic);␊ |
131 | ␉printf("cputype: %x\n", (unsigned)mH->cputype);␊ |
132 | ␉printf("cpusubtype: %x\n", (unsigned)mH->cpusubtype);␊ |
133 | ␉printf("filetype: %x\n", (unsigned)mH->filetype);␊ |
134 | ␉printf("ncmds: %x\n", (unsigned)mH->ncmds);␊ |
135 | ␉printf("sizeofcmds: %x\n", (unsigned)mH->sizeofcmds);␊ |
136 | ␉printf("flags: %x\n", (unsigned)mH->flags);␊ |
137 | ␉getchar();␊ |
138 | #endif␊ |
139 | ␊ |
140 | ␉switch (archCpuType)␊ |
141 | ␉{␊ |
142 | ␉␉case CPU_TYPE_I386:␊ |
143 | ␊ |
144 | ␉␉␉if (mH->magic != MH_MAGIC)␊ |
145 | ␉␉␉{␊ |
146 | ␉␉␉␉error("Mach-O file has bad magic number\n");␊ |
147 | ␉␉␉␉return -1;␊ |
148 | ␉␉␉}␊ |
149 | ␊ |
150 | ␉␉␉cmdstart = (unsigned long)gBinaryAddress + sizeof(struct mach_header);␊ |
151 | ␉␉␉break;␊ |
152 | ␊ |
153 | ␉␉case CPU_TYPE_X86_64:␊ |
154 | ␊ |
155 | ␉␉␉if (mH->magic != MH_MAGIC_64 && mH->magic == MH_MAGIC)␊ |
156 | ␉␉␉{␊ |
157 | ␉␉␉␉return -1;␊ |
158 | ␉␉␉}␊ |
159 | ␊ |
160 | ␉␉␉if (mH->magic != MH_MAGIC_64)␊ |
161 | ␉␉␉{␊ |
162 | ␉␉␉␉error("Mach-O file has bad magic number\n");␊ |
163 | ␉␉␉␉return -1;␊ |
164 | ␉␉␉}␊ |
165 | ␊ |
166 | ␉␉␉cmdstart = (unsigned long)gBinaryAddress + sizeof(struct mach_header_64);␊ |
167 | ␉␉␉break;␊ |
168 | ␊ |
169 | ␉␉default:␊ |
170 | ␊ |
171 | ␉␉␉error("Unknown CPU type\n");␊ |
172 | ␉␉␉return -1;␊ |
173 | ␉}␊ |
174 | ␊ |
175 | ␉cmdBase = cmdstart;␊ |
176 | ␉ncmds = mH->ncmds;␊ |
177 | ␊ |
178 | ␉for (cnt = 0; cnt < ncmds; cnt++)␊ |
179 | ␉{␊ |
180 | ␉␉cmd = ((long *)cmdBase)[0];␊ |
181 | ␉␉cmdsize = ((long *)cmdBase)[1];␊ |
182 | ␉␉unsigned int load_addr;␊ |
183 | ␉␉unsigned int load_size;␊ |
184 | ␊ |
185 | ␉␉switch (cmd)␊ |
186 | ␉␉{␊ |
187 | ␉␉␉case LC_SEGMENT:␊ |
188 | ␉␉␉case LC_SEGMENT_64:␊ |
189 | ␊ |
190 | ␉␉␉ret = DecodeSegment(cmdBase, &load_addr, &load_size);␊ |
191 | ␊ |
192 | ␉␉␉if (ret == 0 && load_size != 0 && load_addr >= KERNEL_ADDR)␊ |
193 | ␉␉␉{␊ |
194 | ␉␉␉␉vmaddr = MIN(vmaddr, load_addr);␊ |
195 | ␉␉␉␉vmend = MAX(vmend, load_addr + load_size);␊ |
196 | ␉␉␉}␊ |
197 | ␉␉␉break;␊ |
198 | ␊ |
199 | ␉␉␉case LC_MAIN:␉/* Mountain Lion's replacement for LC_UNIXTHREAD */␊ |
200 | ␉␉␉case LC_UNIXTHREAD:␊ |
201 | ␉␉␉␉ret = DecodeUnixThread(cmdBase, &entry);␊ |
202 | ␉␉␉break;␊ |
203 | ␊ |
204 | ␉␉␉case LC_SYMTAB:␊ |
205 | ␉␉␉break;␊ |
206 | ␊ |
207 | ␉␉␉default:␊ |
208 | #if NOTDEF␊ |
209 | ␉␉␉printf("Ignoring cmd type %d.\n", (unsigned)cmd);␊ |
210 | #endif␊ |
211 | ␉␉␉break;␊ |
212 | ␉␉}␊ |
213 | ␊ |
214 | ␊ |
215 | ␉if (ret != 0)␊ |
216 | ␉{␊ |
217 | ␉␉return -1;␊ |
218 | ␉}␊ |
219 | ␊ |
220 | ␉cmdBase += cmdsize;␊ |
221 | ␉}␊ |
222 | ␊ |
223 | ␉*rentry = (entry_t)( (unsigned long) entry & 0x3fffffff );␊ |
224 | ␉*rsize = vmend - vmaddr;␊ |
225 | ␉*raddr = (char *)vmaddr;␊ |
226 | ␊ |
227 | ␉cmdBase = cmdstart;␊ |
228 | ␊ |
229 | ␉for (cnt = 0; cnt < ncmds; cnt++)␊ |
230 | {␊ |
231 | ␉cmd = ((long *)cmdBase)[0];␊ |
232 | ␉cmdsize = ((long *)cmdBase)[1];␊ |
233 | ␉␉␊ |
234 | ␉if (cmd == LC_SYMTAB)␊ |
235 | {␊ |
236 | ␉␉if (DecodeSymbolTable(cmdBase) != 0)␊ |
237 | ␉␉{␊ |
238 | ␉␉␉return -1;␊ |
239 | ␉␉}␊ |
240 | }␊ |
241 | ␊ |
242 | ␉␉cmdBase += cmdsize;␊ |
243 | }␊ |
244 | ␉␊ |
245 | ␉return ret;␊ |
246 | }␊ |
247 | ␊ |
248 | ␊ |
249 | //==============================================================================␊ |
250 | // Private function.␊ |
251 | ␊ |
252 | ␊ |
253 | static long DecodeSegment(long cmdBase, unsigned int *load_addr, unsigned int *load_size)␊ |
254 | {␊ |
255 | ␉char *segname;␊ |
256 | ␉long vmsize, filesize;␊ |
257 | ␉unsigned long vmaddr, fileaddr;␊ |
258 | ␊ |
259 | ␉if (((long *)cmdBase)[0] == LC_SEGMENT_64)␊ |
260 | ␉{␊ |
261 | ␉␉struct segment_command_64 *segCmd;␊ |
262 | ␉␉segCmd = (struct segment_command_64 *)cmdBase;␊ |
263 | ␉␉vmaddr = (segCmd->vmaddr & 0x3fffffff);␊ |
264 | ␉␉vmsize = segCmd->vmsize;␉ ␊ |
265 | ␉␉fileaddr = (gBinaryAddress + segCmd->fileoff);␊ |
266 | ␉␉filesize = segCmd->filesize;␊ |
267 | ␉␉segname = segCmd->segname;␊ |
268 | ␊ |
269 | #ifdef DEBUG␊ |
270 | printf("segname: %s, vmaddr: %x, vmsize: %x, fileoff: %x, filesize: %x, nsects: %d, flags: %x.\n",␊ |
271 | ␉ segCmd->segname, (unsigned)vmaddr, (unsigned)vmsize, (unsigned)fileaddr, (unsigned)filesize,␊ |
272 | (unsigned) segCmd->nsects, (unsigned)segCmd->flags);␊ |
273 | getchar();␊ |
274 | #endif␊ |
275 | ␉}␊ |
276 | ␉else␊ |
277 | ␉{␊ |
278 | ␉␉struct segment_command *segCmd;␊ |
279 | ␊ |
280 | ␉␉segCmd = (struct segment_command *)cmdBase;␊ |
281 | ␊ |
282 | ␉␉vmaddr = (segCmd->vmaddr & 0x3fffffff);␊ |
283 | ␉␉vmsize = segCmd->vmsize;␊ |
284 | ␉␉fileaddr = (gBinaryAddress + segCmd->fileoff);␊ |
285 | ␉␉filesize = segCmd->filesize;␊ |
286 | ␉␉segname = segCmd->segname;␊ |
287 | ␊ |
288 | #ifdef DEBUG␊ |
289 | ␉printf("segname: %s, vmaddr: %x, vmsize: %x, fileoff: %x, filesize: %x, nsects: %d, flags: %x.\n",␊ |
290 | ␉segCmd->segname, (unsigned)vmaddr, (unsigned)vmsize, (unsigned)fileaddr, (unsigned)filesize, (unsigned) segCmd->nsects, (unsigned)segCmd->flags);␊ |
291 | ␉getchar();␊ |
292 | #endif␊ |
293 | ␉}␊ |
294 | ␊ |
295 | ␉if (vmsize == 0 || filesize == 0)␊ |
296 | ␉{␊ |
297 | ␉␉*load_addr = ~0;␊ |
298 | ␉␉*load_size = 0;␊ |
299 | ␉␉return 0;␊ |
300 | ␉}␊ |
301 | ␊ |
302 | ␉␉if (! ((vmaddr >= KERNEL_ADDR && (vmaddr + vmsize) <= (KERNEL_ADDR + KERNEL_LEN)) ||␊ |
303 | ␉␉␉ (vmaddr >= HIB_ADDR && (vmaddr + vmsize) <= (HIB_ADDR + HIB_LEN))))␊ |
304 | ␉␉{␊ |
305 | ␉␉stop("Kernel overflows available space");␊ |
306 | ␉␉}␊ |
307 | ␊ |
308 | ␉␉if (vmsize && ((strcmp(segname, "__PRELINK_INFO") == 0) || (strcmp(segname, "__PRELINK") == 0)))␊ |
309 | ␉␉{␊ |
310 | ␉␉␉gHaveKernelCache = true;␊ |
311 | ␉␉}␊ |
312 | ␊ |
313 | ␉// Copy from file load area.␊ |
314 | ␉if (vmsize>0 && filesize > 0)␊ |
315 | ␉{␊ |
316 | ␉␉bcopy((char *)fileaddr, (char *)vmaddr, vmsize > filesize ? filesize : vmsize);␊ |
317 | ␉}␊ |
318 | ␊ |
319 | ␉// Zero space at the end of the segment.␊ |
320 | ␉if (vmsize > filesize)␊ |
321 | ␉{␊ |
322 | ␉␉bzero((char *)(vmaddr + filesize), vmsize - filesize);␊ |
323 | ␉}␊ |
324 | ␊ |
325 | ␉*load_addr = vmaddr;␊ |
326 | ␉*load_size = vmsize;␊ |
327 | ␊ |
328 | ␉return 0;␊ |
329 | }␊ |
330 | ␊ |
331 | ␊ |
332 | //==============================================================================␊ |
333 | ␊ |
334 | static long DecodeUnixThread(long cmdBase, unsigned int *entry)␊ |
335 | {␊ |
336 | ␉switch (archCpuType)␊ |
337 | ␉{␊ |
338 | ␉␉case CPU_TYPE_I386:␊ |
339 | ␉␉{␊ |
340 | ␉␉␉i386_thread_state_t *i386ThreadState;␊ |
341 | ␉␉␉i386ThreadState = (i386_thread_state_t *) (cmdBase + sizeof(struct thread_command) + 8);␊ |
342 | ␊ |
343 | ␉␉␉*entry = i386ThreadState->eip;␊ |
344 | ␉␉␉return 0;␊ |
345 | ␉␉}␊ |
346 | ␉␉␉␊ |
347 | ␉␉case CPU_TYPE_X86_64:␊ |
348 | ␉␉{␊ |
349 | ␉␉␉x86_thread_state64_t *x86_64ThreadState;␊ |
350 | ␉␉␉x86_64ThreadState = (x86_thread_state64_t *) (cmdBase + sizeof(struct thread_command) + 8);␊ |
351 | ␉␉␉*entry = x86_64ThreadState->rip;␊ |
352 | ␉␉␉return 0;␊ |
353 | ␉␉}␊ |
354 | ␉␉␉␊ |
355 | ␉␉default:␊ |
356 | ␉␉␉error("Unknown CPU type\n");␊ |
357 | ␉␉␉return -1;␊ |
358 | ␉}␊ |
359 | }␊ |
360 | ␊ |
361 | ␊ |
362 | //==============================================================================␊ |
363 | ␊ |
364 | static long DecodeSymbolTable(long cmdBase)␊ |
365 | {␊ |
366 | ␉long tmpAddr, symsSize, totalSize;␊ |
367 | ␉long gSymbolTableAddr;␊ |
368 | ␉long gSymbolTableSize;␊ |
369 | ␊ |
370 | ␉struct symtab_command *symTab, *symTableSave;␊ |
371 | ␊ |
372 | ␉symTab = (struct symtab_command *)cmdBase;␊ |
373 | ␊ |
374 | #if DEBUG␊ |
375 | ␊ |
376 | ␉printf("symoff: %x, nsyms: %x, stroff: %x, strsize: %x\n", symTab->symoff, symTab->nsyms, symTab->stroff, symTab->strsize);␊ |
377 | ␉getchar();␊ |
378 | #endif␊ |
379 | ␊ |
380 | ␉symsSize = symTab->stroff - symTab->symoff;␊ |
381 | ␉totalSize = symsSize + symTab->strsize;␊ |
382 | ␊ |
383 | ␉gSymbolTableSize = totalSize + sizeof(struct symtab_command);␊ |
384 | ␉gSymbolTableAddr = AllocateKernelMemory(gSymbolTableSize);␊ |
385 | ␉// Add the SymTab to the memory-map.␊ |
386 | ␉AllocateMemoryRange("Kernel-__SYMTAB", gSymbolTableAddr, gSymbolTableSize, -1);␊ |
387 | ␊ |
388 | ␉symTableSave = (struct symtab_command *)gSymbolTableAddr;␊ |
389 | ␉tmpAddr = gSymbolTableAddr + sizeof(struct symtab_command);␊ |
390 | ␊ |
391 | ␉symTableSave->symoff = tmpAddr;␊ |
392 | ␉symTableSave->nsyms = symTab->nsyms;␊ |
393 | ␉symTableSave->stroff = tmpAddr + symsSize;␊ |
394 | ␉symTableSave->strsize = symTab->strsize;␊ |
395 | ␉␊ |
396 | ␉bcopy((char *)(gBinaryAddress + symTab->symoff), (char *)tmpAddr, totalSize);␊ |
397 | ␊ |
398 | ␉return 0;␊ |
399 | }␊ |
400 | |