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