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