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