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 | #include "sl.h" //Azi:???␊ |
35 | ␊ |
36 | static long DecodeSegment(long cmdBase, unsigned int*load_addr, unsigned int *load_size);␊ |
37 | static long DecodeUnixThread(long cmdBase, unsigned int *entry);␊ |
38 | static long DecodeSymbolTable(long cmdBase);␊ |
39 | ␊ |
40 | ␊ |
41 | static unsigned long gBinaryAddress;␊ |
42 | bool gHaveKernelCache;␉␉␉/* XXX aserebln: uninitialized? and only set to true, never to false */␊ |
43 | cpu_type_t archCpuType=CPU_TYPE_I386;␊ |
44 | ␊ |
45 | // Public Functions␊ |
46 | ␊ |
47 | long ThinFatFile(void **binary, unsigned long *length)␊ |
48 | {␊ |
49 | unsigned long nfat, swapped, size = 0;␊ |
50 | struct fat_header *fhp = (struct fat_header *)*binary;␊ |
51 | struct fat_arch *fap =␊ |
52 | (struct fat_arch *)((unsigned long)*binary + sizeof(struct fat_header));␊ |
53 | cpu_type_t fapcputype;␊ |
54 | uint32_t fapoffset;␊ |
55 | uint32_t fapsize;␉␊ |
56 | ␊ |
57 | if (fhp->magic == FAT_MAGIC) {␊ |
58 | nfat = fhp->nfat_arch;␊ |
59 | swapped = 0;␊ |
60 | } else if (fhp->magic == FAT_CIGAM) {␊ |
61 | nfat = OSSwapInt32(fhp->nfat_arch);␊ |
62 | swapped = 1;␊ |
63 | } else {␊ |
64 | return -1;␊ |
65 | }␊ |
66 | ␊ |
67 | for (; nfat > 0; nfat--, fap++) {␊ |
68 | if (swapped) {␊ |
69 | fapcputype = OSSwapInt32(fap->cputype);␊ |
70 | fapoffset = OSSwapInt32(fap->offset);␊ |
71 | fapsize = OSSwapInt32(fap->size);␊ |
72 | }␊ |
73 | ␉else␊ |
74 | ␉{␊ |
75 | ␉␉fapcputype = fap->cputype;␊ |
76 | ␉␉fapoffset = fap->offset;␊ |
77 | ␉␉fapsize = fap->size;␊ |
78 | ␉}␊ |
79 | ␊ |
80 | if (fapcputype == archCpuType) {␊ |
81 | *binary = (void *) ((unsigned long)*binary + fapoffset);␊ |
82 | ␉ size = fapsize;␊ |
83 | ␉ break;␊ |
84 | }␊ |
85 | }␊ |
86 | ␊ |
87 | if (length != 0) *length = size;␊ |
88 | ␊ |
89 | return 0;␊ |
90 | }␊ |
91 | ␊ |
92 | long DecodeMachO(void *binary, entry_t *rentry, char **raddr, int *rsize)␊ |
93 | {␊ |
94 | struct mach_header *mH;␊ |
95 | unsigned long ncmds, cmdBase, cmd, cmdsize, cmdstart;␊ |
96 | // long headerBase, headerAddr, headerSize;␊ |
97 | unsigned int vmaddr = ~0;␊ |
98 | unsigned int vmend = 0;␊ |
99 | unsigned long cnt;␊ |
100 | long ret = -1;␊ |
101 | unsigned int entry = 0;␊ |
102 | ␊ |
103 | gBinaryAddress = (unsigned long)binary;␊ |
104 | ␊ |
105 | mH = (struct mach_header *)(gBinaryAddress);␊ |
106 | switch (archCpuType)␊ |
107 | ␉{␊ |
108 | ␉␉case CPU_TYPE_I386:␊ |
109 | ␉␉␉if (mH->magic != MH_MAGIC) {␊ |
110 | ␉␉␉␉error("Mach-O file has bad magic number\n");␊ |
111 | ␉␉␉␉return -1;␊ |
112 | ␉␉␉}␊ |
113 | ␉␉␉cmdstart = (unsigned long)gBinaryAddress + sizeof(struct mach_header);␊ |
114 | ␉␉␉break;␊ |
115 | ␉␉case CPU_TYPE_X86_64:␊ |
116 | ␉␉␉if (mH->magic != MH_MAGIC_64 && mH->magic == MH_MAGIC) ␊ |
117 | ␉␉␉␉return -1;␊ |
118 | ␉␉␉if (mH->magic != MH_MAGIC_64) {␊ |
119 | ␉␉␉␉error("Mach-O file has bad magic number\n");␊ |
120 | ␉␉␉␉return -1;␊ |
121 | ␉␉␉}␊ |
122 | ␉␉␉cmdstart = (unsigned long)gBinaryAddress + sizeof(struct mach_header_64);␊ |
123 | ␉␉␉break;␊ |
124 | ␉␉default:␊ |
125 | ␉␉␉error("Unknown CPU type\n");␊ |
126 | ␉␉␉return -1;␊ |
127 | ␉}␊ |
128 | ␉␉␉␊ |
129 | cmdBase = cmdstart;␊ |
130 | ␊ |
131 | #if DEBUG␊ |
132 | printf("magic: %x\n", (unsigned)mH->magic);␊ |
133 | printf("cputype: %x\n", (unsigned)mH->cputype);␊ |
134 | printf("cpusubtype: %x\n", (unsigned)mH->cpusubtype);␊ |
135 | printf("filetype: %x\n", (unsigned)mH->filetype);␊ |
136 | printf("ncmds: %x\n", (unsigned)mH->ncmds);␊ |
137 | printf("sizeofcmds: %x\n", (unsigned)mH->sizeofcmds);␊ |
138 | printf("flags: %x\n", (unsigned)mH->flags);␊ |
139 | getc();␊ |
140 | #endif␊ |
141 | ␊ |
142 | ncmds = mH->ncmds;␊ |
143 | ␊ |
144 | for (cnt = 0; cnt < ncmds; cnt++) {␊ |
145 | cmd = ((long *)cmdBase)[0];␊ |
146 | cmdsize = ((long *)cmdBase)[1];␊ |
147 | unsigned int load_addr;␊ |
148 | unsigned int load_size;␊ |
149 | ␊ |
150 | switch (cmd) {␊ |
151 | ␉case LC_SEGMENT_64: ␊ |
152 | case LC_SEGMENT:␊ |
153 | ret = DecodeSegment(cmdBase, &load_addr, &load_size);␊ |
154 | if (ret == 0 && load_size != 0 && load_addr >= KERNEL_ADDR) {␊ |
155 | vmaddr = MIN(vmaddr, load_addr);␊ |
156 | vmend = MAX(vmend, load_addr + load_size);␊ |
157 | }␊ |
158 | break;␊ |
159 | ␊ |
160 | case LC_UNIXTHREAD:␊ |
161 | ret = DecodeUnixThread(cmdBase, &entry);␊ |
162 | break;␊ |
163 | ␊ |
164 | case LC_SYMTAB:␊ |
165 | break;␊ |
166 | ␊ |
167 | default:␊ |
168 | #if NOTDEF␊ |
169 | printf("Ignoring cmd type %d.\n", (unsigned)cmd);␊ |
170 | #endif␊ |
171 | break;␊ |
172 | }␊ |
173 | ␊ |
174 | if (ret != 0) return -1;␊ |
175 | ␊ |
176 | cmdBase += cmdsize;␊ |
177 | }␊ |
178 | ␊ |
179 | *rentry = (entry_t)( (unsigned long) entry & 0x3fffffff );␊ |
180 | *rsize = vmend - vmaddr;␊ |
181 | *raddr = (char *)vmaddr;␊ |
182 | ␊ |
183 | cmdBase = cmdstart;␊ |
184 | for (cnt = 0; cnt < ncmds; cnt++) {␊ |
185 | ␉cmd = ((long *)cmdBase)[0];␊ |
186 | ␉cmdsize = ((long *)cmdBase)[1];␊ |
187 | ␉␉␊ |
188 | ␉if(cmd==LC_SYMTAB) ␊ |
189 | ␉ if (DecodeSymbolTable(cmdBase)!=0)␊ |
190 | ␉␉return -1;␊ |
191 | ␉␉␊ |
192 | ␉cmdBase += cmdsize;␊ |
193 | }␉␊ |
194 | ␉␊ |
195 | return ret;␊ |
196 | }␊ |
197 | ␊ |
198 | // Private Functions␊ |
199 | ␊ |
200 | static long DecodeSegment(long cmdBase, unsigned int *load_addr, unsigned int *load_size)␊ |
201 | {␊ |
202 | unsigned long vmaddr, fileaddr;␊ |
203 | long vmsize, filesize;␊ |
204 | char *segname;␊ |
205 | ␊ |
206 | if (((long *)cmdBase)[0]==LC_SEGMENT_64)␊ |
207 | {␊ |
208 | ␉ struct segment_command_64 *segCmd;␊ |
209 | ␉ ␊ |
210 | ␉ segCmd = (struct segment_command_64 *)cmdBase;␊ |
211 | ␉ ␊ |
212 | ␉ vmaddr = (segCmd->vmaddr & 0x3fffffff);␊ |
213 | ␉ vmsize = segCmd->vmsize;␉ ␊ |
214 | ␉ fileaddr = (gBinaryAddress + segCmd->fileoff);␊ |
215 | ␉ filesize = segCmd->filesize;␊ |
216 | ␊ |
217 | ␉ segname=segCmd->segname;␉ ␊ |
218 | }␊ |
219 | else␊ |
220 | {␊ |
221 | ␉ struct segment_command *segCmd;␊ |
222 | ␊ |
223 | ␉ segCmd = (struct segment_command *)cmdBase;␊ |
224 | ␊ |
225 | ␉ vmaddr = (segCmd->vmaddr & 0x3fffffff);␊ |
226 | ␉ vmsize = segCmd->vmsize;␊ |
227 | ␉ fileaddr = (gBinaryAddress + segCmd->fileoff);␊ |
228 | ␉ filesize = segCmd->filesize;␊ |
229 | ␉ ␊ |
230 | ␉ segname=segCmd->segname;␉ ␊ |
231 | }␊ |
232 | ␊ |
233 | if (vmsize == 0 || filesize == 0) {␊ |
234 | *load_addr = ~0;␊ |
235 | *load_size = 0;␊ |
236 | return 0;␊ |
237 | }␊ |
238 | ␊ |
239 | #if DEBUG␊ |
240 | printf("segname: %s, vmaddr: %x, vmsize: %x, fileoff: %x, filesize: %x, nsects: %d, flags: %x.\n",␊ |
241 | ␉ segCmd->segname, (unsigned)vmaddr, (unsigned)vmsize, (unsigned)fileaddr, (unsigned)filesize,␊ |
242 | (unsigned) segCmd->nsects, (unsigned)segCmd->flags);␊ |
243 | getc();␊ |
244 | #endif␊ |
245 | ␊ |
246 | if (! ((vmaddr >= KERNEL_ADDR &&␊ |
247 | (vmaddr + vmsize) <= (KERNEL_ADDR + KERNEL_LEN)) ||␊ |
248 | (vmaddr >= HIB_ADDR &&␊ |
249 | (vmaddr + vmsize) <= (HIB_ADDR + HIB_LEN)))) {␊ |
250 | stop("Kernel overflows available space");␊ |
251 | }␊ |
252 | ␊ |
253 | if (vmsize && (strcmp(segname, "__PRELINK") == 0))␊ |
254 | gHaveKernelCache = true;␊ |
255 | ␊ |
256 | // Copy from file load area.␊ |
257 | if (vmsize>0 && filesize>0)␊ |
258 | ␉ bcopy((char *)fileaddr, (char *)vmaddr, vmsize>filesize?filesize:vmsize);␊ |
259 | ␊ |
260 | // Zero space at the end of the segment.␊ |
261 | if (vmsize > filesize)␊ |
262 | bzero((char *)(vmaddr + filesize), vmsize - filesize);␊ |
263 | ␊ |
264 | *load_addr = vmaddr;␊ |
265 | *load_size = vmsize;␊ |
266 | ␊ |
267 | return 0;␊ |
268 | }␊ |
269 | ␊ |
270 | static long DecodeUnixThread(long cmdBase, unsigned int *entry)␊ |
271 | {␊ |
272 | ␉switch (archCpuType)␊ |
273 | ␉{␊ |
274 | ␉␉case CPU_TYPE_I386:␊ |
275 | ␉␉{␊ |
276 | ␉␉␉i386_thread_state_t *i386ThreadState;␊ |
277 | ␊ |
278 | ␉␉␉i386ThreadState = (i386_thread_state_t *)␊ |
279 | ␉␉␉␉(cmdBase + sizeof(struct thread_command) + 8);␊ |
280 | ␊ |
281 | ␉␉#if defined(__DARWIN_UNIX03) && __DARWIN_UNIX03␊ |
282 | ␉␉␉*entry = i386ThreadState->__eip;␊ |
283 | ␉␉#else␊ |
284 | ␉␉␉*entry = i386ThreadState->eip;␊ |
285 | ␉␉#endif␊ |
286 | ␉␉␉return 0;␊ |
287 | ␉␉}␊ |
288 | ␉␉␉␊ |
289 | ␉␉case CPU_TYPE_X86_64:␊ |
290 | ␉␉{␊ |
291 | ␉␉␉x86_thread_state64_t *x86_64ThreadState;␊ |
292 | ␉␉␉␊ |
293 | ␉␉␉x86_64ThreadState = (x86_thread_state64_t *)␊ |
294 | ␉␉␉(cmdBase + sizeof(struct thread_command) + 8);␊ |
295 | ␉␉␉␊ |
296 | ␉␉#if defined(__DARWIN_UNIX03) && __DARWIN_UNIX03␊ |
297 | ␉␉␉*entry = x86_64ThreadState->__rip;␊ |
298 | ␉␉#else␊ |
299 | ␉␉␉*entry = x86_64ThreadState->rip;␊ |
300 | ␉␉#endif␊ |
301 | ␉␉␉return 0;␊ |
302 | ␉␉}␊ |
303 | ␉␉␉␊ |
304 | ␉␉default:␊ |
305 | ␉␉␉error("Unknown CPU type\n");␊ |
306 | ␉␉␉return -1;␊ |
307 | ␉}␊ |
308 | }␊ |
309 | ␊ |
310 | static long DecodeSymbolTable(long cmdBase)␊ |
311 | {␊ |
312 | struct symtab_command *symTab, *symTableSave;␊ |
313 | long tmpAddr, symsSize, totalSize;␊ |
314 | long gSymbolTableAddr;␊ |
315 | long gSymbolTableSize;␊ |
316 | ␊ |
317 | symTab = (struct symtab_command *)cmdBase;␊ |
318 | ␊ |
319 | #if DEBUG␊ |
320 | printf("symoff: %x, nsyms: %x, stroff: %x, strsize: %x\n",␊ |
321 | ␉ symTab->symoff, symTab->nsyms, symTab->stroff, symTab->strsize);␊ |
322 | ␉getc ();␊ |
323 | #endif␊ |
324 | ␊ |
325 | symsSize = symTab->stroff - symTab->symoff;␊ |
326 | totalSize = symsSize + symTab->strsize;␊ |
327 | ␊ |
328 | gSymbolTableSize = totalSize + sizeof(struct symtab_command);␊ |
329 | gSymbolTableAddr = AllocateKernelMemory(gSymbolTableSize);␊ |
330 | // Add the SymTab to the memory-map.␊ |
331 | AllocateMemoryRange("Kernel-__SYMTAB", gSymbolTableAddr, gSymbolTableSize, -1);␊ |
332 | ␊ |
333 | symTableSave = (struct symtab_command *)gSymbolTableAddr;␊ |
334 | tmpAddr = gSymbolTableAddr + sizeof(struct symtab_command);␊ |
335 | ␊ |
336 | symTableSave->symoff = tmpAddr;␊ |
337 | symTableSave->nsyms = symTab->nsyms;␊ |
338 | symTableSave->stroff = tmpAddr + symsSize;␊ |
339 | symTableSave->strsize = symTab->strsize;␊ |
340 | ␉␊ |
341 | bcopy((char *)(gBinaryAddress + symTab->symoff),␊ |
342 | ␉(char *)tmpAddr, totalSize);␊ |
343 | return 0;␊ |
344 | }␊ |
345 | |