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 | * load.c - Functions for decoding a Mach-o Kernel.␊ |
23 | *␊ |
24 | * Copyright (c) 1998-2003 Apple Computer, Inc.␊ |
25 | *␊ |
26 | */␊ |
27 | ␊ |
28 | #include <mach-o/fat.h>␊ |
29 | #include <mach-o/loader.h>␊ |
30 | #include <mach/machine/thread_status.h>␊ |
31 | ␊ |
32 | #include <sl.h>␊ |
33 | ␊ |
34 | #if DEBUG␊ |
35 | #define DBG(x...)␉printf(x)␊ |
36 | #else␊ |
37 | #define DBG(x...)␉msglog(x)␊ |
38 | #endif␊ |
39 | ␊ |
40 | static long DecodeSegment(long cmdBase, unsigned int*load_addr, unsigned int *load_size);␊ |
41 | static long DecodeUnixThread(long cmdBase, unsigned int *entry);␊ |
42 | static long DecodeSymbolTable(long cmdBase);␊ |
43 | ␊ |
44 | ␊ |
45 | static unsigned long gBinaryAddress;␊ |
46 | bool gHaveKernelCache;␉␉␉/* XXX aserebln: uninitialized? and only set to true, never to false */␊ |
47 | cpu_type_t archCpuType=CPU_TYPE_I386;␊ |
48 | ␊ |
49 | ␊ |
50 | //==============================================================================␊ |
51 | // Public function.␊ |
52 | ␊ |
53 | long ThinFatFile(void **binary, unsigned long *length)␊ |
54 | {␊ |
55 | ␉unsigned long nfat, swapped, size = 0;␊ |
56 | ␉struct fat_header *fhp = (struct fat_header *)*binary;␊ |
57 | ␉struct fat_arch *fap = (struct fat_arch *)((unsigned long)*binary + sizeof(struct fat_header));␊ |
58 | ␉cpu_type_t fapcputype;␊ |
59 | ␉uint32_t fapoffset;␊ |
60 | ␉uint32_t fapsize;␊ |
61 | ␊ |
62 | ␉if (fhp->magic == FAT_MAGIC)/* 0xcafebabe */␊ |
63 | ␉{␊ |
64 | ␉␉nfat = fhp->nfat_arch;␊ |
65 | ␉␉swapped = 0;␊ |
66 | ␉}␊ |
67 | ␉else if (fhp->magic == FAT_CIGAM)/* 0xbebafeca */␊ |
68 | ␉{␊ |
69 | ␉␉nfat = OSSwapInt32(fhp->nfat_arch);␊ |
70 | ␉␉swapped = 1;␊ |
71 | ␉}␊ |
72 | ␉else␊ |
73 | ␉{␊ |
74 | ␉␉return -1;␊ |
75 | ␉}␊ |
76 | ␊ |
77 | ␉for (; nfat > 0; nfat--, fap++)␊ |
78 | ␉{␊ |
79 | ␉␉if (swapped)␊ |
80 | ␉␉{␊ |
81 | ␉␉␉fapcputype = OSSwapInt32(fap->cputype);␊ |
82 | ␉␉␉fapoffset = OSSwapInt32(fap->offset);␊ |
83 | ␉␉␉fapsize = OSSwapInt32(fap->size);␊ |
84 | ␉␉}␊ |
85 | ␉␉else␊ |
86 | ␉␉{␊ |
87 | ␉␉␉fapcputype = fap->cputype;␊ |
88 | ␉␉␉fapoffset = fap->offset;␊ |
89 | ␉␉␉fapsize = fap->size;␊ |
90 | ␉␉}␊ |
91 | ␊ |
92 | ␉␉if (fapcputype == archCpuType)␊ |
93 | ␉␉{␊ |
94 | ␉␉␉*binary = (void *) ((unsigned long)*binary + fapoffset);␊ |
95 | ␉␉␉size = fapsize;␊ |
96 | ␉␉␉break;␊ |
97 | ␉␉}␊ |
98 | ␉}␊ |
99 | ␊ |
100 | ␉if (length != 0)␊ |
101 | ␉{␊ |
102 | ␉␉*length = size;␊ |
103 | ␉}␊ |
104 | ␊ |
105 | ␉return 0;␊ |
106 | }␊ |
107 | ␊ |
108 | ␊ |
109 | //==============================================================================␊ |
110 | ␊ |
111 | long DecodeMachO(void *binary, entry_t *rentry, char **raddr, int *rsize)␊ |
112 | {␊ |
113 | ␉struct mach_header *mH;␊ |
114 | ␉unsigned long ncmds, cmdBase, cmd, cmdsize, cmdstart;␊ |
115 | ␉// long headerBase, headerAddr, headerSize;␊ |
116 | ␉unsigned int vmaddr = ~0;␊ |
117 | ␉unsigned int vmend = 0;␊ |
118 | ␉unsigned long cnt;␊ |
119 | ␉long ret = -1;␊ |
120 | ␉unsigned int entry = 0;␊ |
121 | ␊ |
122 | ␉gBinaryAddress = (unsigned long)binary;␊ |
123 | ␊ |
124 | ␉mH = (struct mach_header *)(gBinaryAddress);␊ |
125 | ␊ |
126 | /*#if DEBUG␊ |
127 | ␉DBG("magic: 0x%x\n", (unsigned)mH->magic);␊ |
128 | ␉DBG("cputype: 0x%x\n", (unsigned)mH->cputype);␊ |
129 | ␉DBG("cpusubtype: 0x%x\n", (unsigned)mH->cpusubtype);␊ |
130 | ␉DBG("filetype: 0x%x\n", (unsigned)mH->filetype);␊ |
131 | ␉DBG("ncmds: 0x%x\n", (unsigned)mH->ncmds);␊ |
132 | ␉DBG("sizeofcmds: 0x%x\n", (unsigned)mH->sizeofcmds);␊ |
133 | ␉DBG("flags: 0x%x\n", (unsigned)mH->flags);␊ |
134 | ␉DBG("archCpuType: 0x%x\n", archCpuType);␊ |
135 | ␉//getchar();␊ |
136 | #endif*/␊ |
137 | ␊ |
138 | ␉switch (archCpuType)␊ |
139 | ␉{␊ |
140 | ␉␉case CPU_TYPE_I386:␊ |
141 | ␊ |
142 | ␉␉␉if (mH->magic != MH_MAGIC)␊ |
143 | ␉␉␉{␊ |
144 | ␉␉␉␉error("Mach-O (i386) file has bad magic number\n");␊ |
145 | ␉␉␉␉return -1;␊ |
146 | ␉␉␉}␊ |
147 | ␊ |
148 | ␉␉␉cmdstart = (unsigned long)gBinaryAddress + sizeof(struct mach_header);␊ |
149 | ␉␉␉break;␊ |
150 | ␊ |
151 | ␉␉case CPU_TYPE_X86_64:␊ |
152 | /*␊ |
153 | ␉␉␉if (mH->magic != MH_MAGIC_64 && mH->magic == MH_MAGIC)␊ |
154 | ␉␉␉{␊ |
155 | ␉␉␉␉return -1;␊ |
156 | ␉␉␉}␊ |
157 | */␊ |
158 | ␉␉␉if (mH->magic != MH_MAGIC_64)␊ |
159 | ␉␉␉{␊ |
160 | ␉␉␉␉error("Mach-O file (x86_64) has bad magic number\n");␊ |
161 | ␉␉␉␉return -1;␊ |
162 | ␉␉␉}␊ |
163 | ␊ |
164 | ␉␉␉cmdstart = (unsigned long)gBinaryAddress + sizeof(struct mach_header_64);␊ |
165 | ␉␉␉break;␊ |
166 | ␊ |
167 | ␉␉default:␊ |
168 | ␊ |
169 | ␉␉␉error("Unknown CPU type\n");␊ |
170 | ␉␉␉return -1;␊ |
171 | ␉}␊ |
172 | ␊ |
173 | ␉cmdBase = cmdstart;␊ |
174 | ␉ncmds = mH->ncmds;␊ |
175 | ␊ |
176 | ␉for (cnt = 0; cnt < ncmds; cnt++)␊ |
177 | ␉{␊ |
178 | ␉␉cmd = ((long *)cmdBase)[0];␊ |
179 | ␉␉cmdsize = ((long *)cmdBase)[1];␊ |
180 | ␉␉unsigned int load_addr;␊ |
181 | ␉␉unsigned int load_size;␊ |
182 | ␊ |
183 | ␉␉switch (cmd)␊ |
184 | ␉␉{␊ |
185 | ␉␉␉case LC_SEGMENT_64:␊ |
186 | ␉␉␉case LC_SEGMENT:␊ |
187 | ␉␉␉ret = DecodeSegment(cmdBase, &load_addr, &load_size);␊ |
188 | ␊ |
189 | ␉␉␉if (ret == 0 && load_size != 0 && load_addr >= KERNEL_ADDR)␊ |
190 | ␉␉␉{␊ |
191 | ␉␉␉␉vmaddr = MIN(vmaddr, load_addr);␊ |
192 | ␉␉␉␉vmend = MAX(vmend, load_addr + load_size);␊ |
193 | ␉␉␉}␊ |
194 | ␉␉␉break;␊ |
195 | ␊ |
196 | ␉␉␉case LC_UNIXTHREAD:␊ |
197 | ␉␉␉␉ret = DecodeUnixThread(cmdBase, &entry);␊ |
198 | ␉␉␉break;␊ |
199 | ␊ |
200 | ␉␉␉case LC_SYMTAB:␊ |
201 | ␉␉␉break;␊ |
202 | ␊ |
203 | ␉␉␉default:␊ |
204 | #if NOTDEF␊ |
205 | ␉␉␉printf("Ignoring cmd type %d.\n", (unsigned)cmd);␊ |
206 | #endif␊ |
207 | ␉␉␉break;␊ |
208 | ␉␉}␊ |
209 | ␊ |
210 | ␊ |
211 | ␉if (ret != 0)␊ |
212 | ␉{␊ |
213 | ␉␉return -1;␊ |
214 | ␉}␊ |
215 | ␊ |
216 | ␉cmdBase += cmdsize;␊ |
217 | ␉}␊ |
218 | ␊ |
219 | ␉*rentry = (entry_t)( (unsigned long) entry & 0x3fffffff );␊ |
220 | ␉*rsize = vmend - vmaddr;␊ |
221 | ␉*raddr = (char *)vmaddr;␊ |
222 | ␊ |
223 | ␉cmdBase = cmdstart;␊ |
224 | ␊ |
225 | ␉for (cnt = 0; cnt < ncmds; cnt++)␊ |
226 | ␉{␊ |
227 | ␉␉cmd = ((long *)cmdBase)[0];␊ |
228 | ␉␉cmdsize = ((long *)cmdBase)[1];␊ |
229 | ␉␉␊ |
230 | ␉␉if (cmd == LC_SYMTAB)␊ |
231 | ␉␉{␊ |
232 | ␉␉␉if (DecodeSymbolTable(cmdBase) != 0)␊ |
233 | ␉␉␉{␊ |
234 | ␉␉␉␉return -1;␊ |
235 | ␉␉␉}␊ |
236 | ␉␉}␊ |
237 | ␊ |
238 | ␉␉cmdBase += cmdsize;␊ |
239 | ␉}␊ |
240 | ␊ |
241 | ␉return ret;␊ |
242 | }␊ |
243 | ␊ |
244 | ␊ |
245 | //==============================================================================␊ |
246 | // Private function.␊ |
247 | ␊ |
248 | ␊ |
249 | static long DecodeSegment(long cmdBase, unsigned int *load_addr, unsigned int *load_size)␊ |
250 | {␊ |
251 | ␉char *segname;␊ |
252 | ␉long vmsize, filesize;␊ |
253 | ␉unsigned long vmaddr, fileaddr;␊ |
254 | ␊ |
255 | ␉if (((long *)cmdBase)[0] == LC_SEGMENT_64)␊ |
256 | ␉{␊ |
257 | ␉␉struct segment_command_64 *segCmd;␊ |
258 | ␉␉segCmd = (struct segment_command_64 *)cmdBase;␊ |
259 | ␉␉vmaddr = (segCmd->vmaddr & 0x3fffffff);␊ |
260 | ␉␉vmsize = segCmd->vmsize;␉ ␊ |
261 | ␉␉fileaddr = (gBinaryAddress + segCmd->fileoff);␊ |
262 | ␉␉filesize = segCmd->filesize;␊ |
263 | ␉␉segname = segCmd->segname;␊ |
264 | ␊ |
265 | #ifdef DEBUG␊ |
266 | ␉printf("segname: %s, vmaddr: %x, vmsize: %x, fileoff: %x, filesize: %x, nsects: %d, flags: %x.\n",␊ |
267 | ␉␉segCmd->segname, (unsigned)vmaddr, (unsigned)vmsize, (unsigned)fileaddr, (unsigned)filesize,␊ |
268 | ␉␉(unsigned) segCmd->nsects, (unsigned)segCmd->flags);␊ |
269 | ␉getchar();␊ |
270 | #endif␊ |
271 | ␉}␊ |
272 | ␉else␊ |
273 | ␉{␊ |
274 | ␉␉struct segment_command *segCmd;␊ |
275 | ␊ |
276 | ␉␉segCmd = (struct segment_command *)cmdBase;␊ |
277 | ␊ |
278 | ␉␉vmaddr = (segCmd->vmaddr & 0x3fffffff);␊ |
279 | ␉␉vmsize = segCmd->vmsize;␊ |
280 | ␉␉fileaddr = (gBinaryAddress + segCmd->fileoff);␊ |
281 | ␉␉filesize = segCmd->filesize;␊ |
282 | ␉␉segname = segCmd->segname;␊ |
283 | ␊ |
284 | #ifdef DEBUG␊ |
285 | ␉printf("segname: %s, vmaddr: %x, vmsize: %x, fileoff: %x, filesize: %x, nsects: %d, flags: %x.\n",␊ |
286 | ␉␉segCmd->segname, (unsigned)vmaddr, (unsigned)vmsize, (unsigned)fileaddr, (unsigned)filesize, (unsigned) segCmd->nsects, (unsigned)segCmd->flags);␊ |
287 | ␉getchar();␊ |
288 | #endif␊ |
289 | ␉}␊ |
290 | ␊ |
291 | ␉if (vmsize == 0 || filesize == 0)␊ |
292 | ␉{␊ |
293 | ␉␉*load_addr = ~0;␊ |
294 | ␉␉*load_size = 0;␊ |
295 | ␉␉return 0;␊ |
296 | ␉}␊ |
297 | ␊ |
298 | ␉if (! ((vmaddr >= KERNEL_ADDR && (vmaddr + vmsize) <= (KERNEL_ADDR + KERNEL_LEN)) ||␊ |
299 | ␉␉ (vmaddr >= HIB_ADDR && (vmaddr + vmsize) <= (HIB_ADDR + HIB_LEN))))␊ |
300 | ␉{␊ |
301 | ␉␉stop("Kernel overflows available space");␊ |
302 | ␉}␊ |
303 | ␊ |
304 | ␉if (vmsize && ((strcmp(segname, "__PRELINK_INFO") == 0) || (strcmp(segname, "__PRELINK") == 0)))␊ |
305 | ␉{␊ |
306 | ␉␉gHaveKernelCache = true;␊ |
307 | ␉}␊ |
308 | ␊ |
309 | ␉// Copy from file load area.␊ |
310 | ␉if (vmsize>0 && filesize > 0)␊ |
311 | ␉{␊ |
312 | ␉␉bcopy((char *)fileaddr, (char *)vmaddr, vmsize > filesize ? filesize : vmsize);␊ |
313 | ␉}␊ |
314 | ␊ |
315 | ␉// Zero space at the end of the segment.␊ |
316 | ␉if (vmsize > filesize)␊ |
317 | ␉{␊ |
318 | ␉␉bzero((char *)(vmaddr + filesize), vmsize - filesize);␊ |
319 | ␉}␊ |
320 | ␊ |
321 | ␉*load_addr = vmaddr;␊ |
322 | ␉*load_size = vmsize;␊ |
323 | ␊ |
324 | ␉return 0;␊ |
325 | }␊ |
326 | ␊ |
327 | //==============================================================================␊ |
328 | ␊ |
329 | static long DecodeUnixThread(long cmdBase, unsigned int *entry)␊ |
330 | {␊ |
331 | ␉switch (archCpuType)␊ |
332 | ␉{␊ |
333 | ␉␉case CPU_TYPE_I386:␊ |
334 | ␉␉{␊ |
335 | ␉␉␉i386_thread_state_t *i386ThreadState;␊ |
336 | ␉␉␉i386ThreadState = (i386_thread_state_t *) (cmdBase + sizeof(struct thread_command) + 8);␊ |
337 | ␊ |
338 | ␉␉␉*entry = i386ThreadState->eip;␊ |
339 | ␉␉␉return 0;␊ |
340 | ␉␉}␊ |
341 | ␉␉␉␊ |
342 | ␉␉case CPU_TYPE_X86_64:␊ |
343 | ␉␉{␊ |
344 | ␉␉␉x86_thread_state64_t *x86_64ThreadState;␊ |
345 | ␉␉␉x86_64ThreadState = (x86_thread_state64_t *) (cmdBase + sizeof(struct thread_command) + 8);␊ |
346 | ␉␉␉*entry = x86_64ThreadState->rip;␊ |
347 | ␉␉␉return 0;␊ |
348 | ␉␉}␊ |
349 | ␉␉␉␊ |
350 | ␉␉default:␊ |
351 | ␉␉␉error("Unknown CPU type\n");␊ |
352 | ␉␉␉return -1;␊ |
353 | ␉}␊ |
354 | }␊ |
355 | ␊ |
356 | ␊ |
357 | //==============================================================================␊ |
358 | ␊ |
359 | static long DecodeSymbolTable(long cmdBase)␊ |
360 | {␊ |
361 | ␉long tmpAddr, symsSize, totalSize;␊ |
362 | ␉long gSymbolTableAddr;␊ |
363 | ␉long gSymbolTableSize;␊ |
364 | ␊ |
365 | ␉struct symtab_command *symTab, *symTableSave;␊ |
366 | ␊ |
367 | ␉symTab = (struct symtab_command *)cmdBase;␊ |
368 | ␊ |
369 | #if DEBUG␊ |
370 | ␉printf("symoff: %x, nsyms: %x, stroff: %x, strsize: %x\n",␊ |
371 | ␉␉symTab->symoff, symTab->nsyms, symTab->stroff, symTab->strsize);␊ |
372 | ␉getchar();␊ |
373 | #endif␊ |
374 | ␊ |
375 | ␉symsSize = symTab->stroff - symTab->symoff;␊ |
376 | ␉totalSize = symsSize + symTab->strsize;␊ |
377 | ␊ |
378 | ␉gSymbolTableSize = totalSize + sizeof(struct symtab_command);␊ |
379 | ␉gSymbolTableAddr = AllocateKernelMemory(gSymbolTableSize);␊ |
380 | ␉// Add the SymTab to the memory-map.␊ |
381 | ␉AllocateMemoryRange("Kernel-__SYMTAB", gSymbolTableAddr, gSymbolTableSize, -1);␊ |
382 | ␊ |
383 | ␉symTableSave = (struct symtab_command *)gSymbolTableAddr;␊ |
384 | ␉tmpAddr = gSymbolTableAddr + sizeof(struct symtab_command);␊ |
385 | ␊ |
386 | ␉symTableSave->symoff = tmpAddr;␊ |
387 | ␉symTableSave->nsyms = symTab->nsyms;␊ |
388 | ␉symTableSave->stroff = tmpAddr + symsSize;␊ |
389 | ␉symTableSave->strsize = symTab->strsize;␊ |
390 | ␉␊ |
391 | ␉bcopy((char *)(gBinaryAddress + symTab->symoff), (char *)tmpAddr, totalSize);␊ |
392 | ␊ |
393 | ␉return 0;␊ |
394 | }␊ |
395 | |