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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/*␊
36 * Backward compatibility fix for the SDK 10.7 version of loader.h␊
37 */␊
38␊
39#ifndef LC_MAIN␊
40␉#define LC_MAIN (0x28|LC_REQ_DYLD) /* replacement for LC_UNIXTHREAD */␊
41#endif␊
42␊
43␊
44static long DecodeSegment(long cmdBase, unsigned int*load_addr, unsigned int *load_size);␊
45static long DecodeUnixThread(long cmdBase, unsigned int *entry);␊
46static long DecodeSymbolTable(long cmdBase);␊
47␊
48␊
49static unsigned long gBinaryAddress;␊
50bool gHaveKernelCache;␉␉␉/* XXX aserebln: uninitialized? and only set to true, never to false */␊
51cpu_type_t archCpuType=CPU_TYPE_I386;␊
52␊
53␊
54//==============================================================================␊
55// Public function.␊
56␊
57long ThinFatFile(void **binary, unsigned long *length)␊
58{␊
59␉unsigned long nfat, swapped, size = 0;␊
60␉struct fat_header *fhp = (struct fat_header *)*binary;␊
61␉struct fat_arch *fap = (struct fat_arch *)((unsigned long)*binary + sizeof(struct fat_header));␊
62␉cpu_type_t fapcputype;␊
63␉uint32_t fapoffset;␊
64␉uint32_t fapsize;␉␊
65 ␊
66␉if (fhp->magic == FAT_MAGIC)␊
67␉{␊
68␉␉nfat = fhp->nfat_arch;␊
69␉␉swapped = 0;␊
70␉}␊
71␉else if (fhp->magic == FAT_CIGAM)␊
72␉{␊
73␉␉nfat = OSSwapInt32(fhp->nfat_arch);␊
74␉␉swapped = 1;␊
75␉}␊
76␉else␊
77␉{␊
78␉␉return -1;␊
79␉}␊
80␊
81␉for (; nfat > 0; nfat--, fap++)␊
82␉{␊
83␉␉if (swapped)␊
84␉␉{␊
85␉␉␉fapcputype = OSSwapInt32(fap->cputype);␊
86␉␉␉fapoffset = OSSwapInt32(fap->offset);␊
87␉␉␉fapsize = OSSwapInt32(fap->size);␊
88␉␉}␊
89␉␉else␊
90␉␉{␊
91␉␉␉fapcputype = fap->cputype;␊
92␉␉␉fapoffset = fap->offset;␊
93␉␉␉fapsize = fap->size;␊
94␉␉}␊
95␊
96␉␉if (fapcputype == archCpuType)␊
97␉␉{␊
98␉␉␉*binary = (void *) ((unsigned long)*binary + fapoffset);␊
99␉␉␉size = fapsize;␊
100␉␉␉break;␊
101␉␉}␊
102␉}␊
103␊
104␉if (length != 0)␊
105␉{␊
106␉␉*length = size;␊
107␉}␊
108␊
109␉return 0;␊
110}␊
111␊
112␊
113//==============================================================================␊
114␊
115long DecodeMachO(void *binary, entry_t *rentry, char **raddr, int *rsize)␊
116{␊
117␉struct mach_header *mH;␊
118␉unsigned long ncmds, cmdBase, cmd, cmdsize, cmdstart;␊
119␉// long headerBase, headerAddr, headerSize;␊
120␉unsigned int vmaddr = ~0;␊
121␉unsigned int vmend = 0;␊
122␉unsigned long cnt;␊
123␉long ret = -1;␊
124␉unsigned int entry = 0;␊
125␊
126␉gBinaryAddress = (unsigned long)binary;␊
127␉mH = (struct mach_header *)(gBinaryAddress);␊
128␊
129#if DEBUG␊
130␉printf("magic: %x\n", (unsigned)mH->magic);␊
131␉printf("cputype: %x\n", (unsigned)mH->cputype);␊
132␉printf("cpusubtype: %x\n", (unsigned)mH->cpusubtype);␊
133␉printf("filetype: %x\n", (unsigned)mH->filetype);␊
134␉printf("ncmds: %x\n", (unsigned)mH->ncmds);␊
135␉printf("sizeofcmds: %x\n", (unsigned)mH->sizeofcmds);␊
136␉printf("flags: %x\n", (unsigned)mH->flags);␊
137␉getchar();␊
138#endif␊
139␊
140␉switch (archCpuType)␊
141␉{␊
142␉␉case CPU_TYPE_I386:␊
143␊
144␉␉␉if (mH->magic != MH_MAGIC)␊
145␉␉␉{␊
146␉␉␉␉error("Mach-O file has bad magic number\n");␊
147␉␉␉␉return -1;␊
148␉␉␉}␊
149␊
150␉␉␉cmdstart = (unsigned long)gBinaryAddress + sizeof(struct mach_header);␊
151␉␉␉break;␊
152␊
153␉␉case CPU_TYPE_X86_64:␊
154␊
155␉␉␉if (mH->magic != MH_MAGIC_64 && mH->magic == MH_MAGIC)␊
156␉␉␉{␊
157␉␉␉␉return -1;␊
158␉␉␉}␊
159␊
160␉␉␉if (mH->magic != MH_MAGIC_64)␊
161␉␉␉{␊
162␉␉␉␉error("Mach-O file has bad magic number\n");␊
163␉␉␉␉return -1;␊
164␉␉␉}␊
165␊
166␉␉␉cmdstart = (unsigned long)gBinaryAddress + sizeof(struct mach_header_64);␊
167␉␉␉break;␊
168␊
169␉␉default:␊
170␊
171␉␉␉error("Unknown CPU type\n");␊
172␉␉␉return -1;␊
173␉}␊
174␊
175␉cmdBase = cmdstart;␊
176␉ncmds = mH->ncmds;␊
177␊
178␉for (cnt = 0; cnt < ncmds; cnt++)␊
179␉{␊
180␉␉cmd = ((long *)cmdBase)[0];␊
181␉␉cmdsize = ((long *)cmdBase)[1];␊
182␉␉unsigned int load_addr;␊
183␉␉unsigned int load_size;␊
184␊
185␉␉switch (cmd)␊
186␉␉{␊
187␉␉␉case LC_SEGMENT_64:␊
188␉␉␉case LC_SEGMENT:␊
189␊
190␉␉␉ret = DecodeSegment(cmdBase, &load_addr, &load_size);␊
191␊
192␉␉␉if (ret == 0 && load_size != 0 && load_addr >= KERNEL_ADDR)␊
193␉␉␉{␊
194␉␉␉␉vmaddr = MIN(vmaddr, load_addr);␊
195␉␉␉␉vmend = MAX(vmend, load_addr + load_size);␊
196␉␉␉}␊
197␉␉␉break;␊
198␊
199␉␉␉case LC_MAIN:␉/* Mountain Lion's replacement for LC_UNIXTHREAD */␊
200␉␉␉case LC_UNIXTHREAD:␊
201␉␉␉␉ret = DecodeUnixThread(cmdBase, &entry);␊
202␉␉␉break;␊
203␊
204␉␉␉case LC_SYMTAB:␊
205␉␉␉break;␊
206␊
207␉␉␉default:␊
208#if NOTDEF␊
209␉␉␉printf("Ignoring cmd type %d.\n", (unsigned)cmd);␊
210#endif␊
211 break;␊
212␉␉}␊
213␊
214␊
215␉if (ret != 0) return -1;␊
216 ␊
217␉cmdBase += cmdsize;␊
218␉}␊
219 ␊
220␉*rentry = (entry_t)( (unsigned long) entry & 0x3fffffff );␊
221␉*rsize = vmend - vmaddr;␊
222␉*raddr = (char *)vmaddr;␊
223 ␊
224␉cmdBase = cmdstart;␊
225␊
226␉for (cnt = 0; cnt < ncmds; cnt++)␊
227{␊
228␉cmd = ((long *)cmdBase)[0];␊
229␉cmdsize = ((long *)cmdBase)[1];␊
230␉␉␊
231␉if (cmd == LC_SYMTAB) ␊
232 {␊
233␉␉if (DecodeSymbolTable(cmdBase) != 0)␊
234␉␉{␊
235␉␉␉return -1;␊
236␉␉}␊
237 }␊
238␊
239␉␉cmdBase += cmdsize;␊
240 }␊
241␉␊
242␉return ret;␊
243}␊
244␊
245␊
246//==============================================================================␊
247// Private function.␊
248␊
249␊
250static long DecodeSegment(long cmdBase, unsigned int *load_addr, unsigned int *load_size)␊
251{␊
252␉char *segname;␊
253␉long vmsize, filesize;␊
254␉unsigned long vmaddr, fileaddr;␊
255␊
256␉if (((long *)cmdBase)[0] == LC_SEGMENT_64)␊
257␉{␊
258␉␉struct segment_command_64 *segCmd;␊
259␉␉segCmd = (struct segment_command_64 *)cmdBase;␊
260␉␉vmaddr = (segCmd->vmaddr & 0x3fffffff);␊
261␉␉vmsize = segCmd->vmsize;␉ ␊
262␉␉fileaddr = (gBinaryAddress + segCmd->fileoff);␊
263␉␉filesize = segCmd->filesize;␊
264␉␉segname = segCmd->segname;␊
265␊
266#ifdef DEBUG␊
267 printf("segname: %s, vmaddr: %x, vmsize: %x, fileoff: %x, filesize: %x, nsects: %d, flags: %x.\n",␊
268␉ segCmd->segname, (unsigned)vmaddr, (unsigned)vmsize, (unsigned)fileaddr, (unsigned)filesize,␊
269 (unsigned) segCmd->nsects, (unsigned)segCmd->flags);␊
270 getchar();␊
271#endif␊
272␉}␊
273␉else␊
274␉{␊
275␉␉struct segment_command *segCmd;␊
276␊
277␉␉segCmd = (struct segment_command *)cmdBase;␊
278␊
279␉␉vmaddr = (segCmd->vmaddr & 0x3fffffff);␊
280␉␉vmsize = segCmd->vmsize;␊
281␉␉fileaddr = (gBinaryAddress + segCmd->fileoff);␊
282␉␉filesize = segCmd->filesize;␊
283␉␉segname = segCmd->segname;␊
284␊
285#ifdef DEBUG␊
286␉printf("segname: %s, vmaddr: %x, vmsize: %x, fileoff: %x, filesize: %x, nsects: %d, flags: %x.\n",␊
287␉segCmd->segname, (unsigned)vmaddr, (unsigned)vmsize, (unsigned)fileaddr, (unsigned)filesize, (unsigned) segCmd->nsects, (unsigned)segCmd->flags);␊
288␉getchar();␊
289#endif␊
290␉}␊
291␊
292␉if (vmsize == 0 || filesize == 0)␊
293␉{␊
294␉␉*load_addr = ~0;␊
295␉␉*load_size = 0;␊
296␉␉return 0;␊
297␉}␊
298␊
299␉␉if (! ((vmaddr >= KERNEL_ADDR && (vmaddr + vmsize) <= (KERNEL_ADDR + KERNEL_LEN)) ||␊
300␉␉␉ (vmaddr >= HIB_ADDR && (vmaddr + vmsize) <= (HIB_ADDR + HIB_LEN))))␊
301␉␉{␊
302␉␉stop("Kernel overflows available space");␊
303␉␉}␊
304␊
305␉␉if (vmsize && ((strcmp(segname, "__PRELINK_INFO") == 0) || (strcmp(segname, "__PRELINK") == 0)))␊
306␉␉␉gHaveKernelCache = true;␊
307 ␊
308 // Copy from file load area.␊
309 if (vmsize>0 && filesize>0)␊
310␉bcopy((char *)fileaddr, (char *)vmaddr, vmsize>filesize?filesize:vmsize);␊
311 ␊
312␉// Zero space at the end of the segment.␊
313␉if (vmsize > filesize)␊
314␉bzero((char *)(vmaddr + filesize), vmsize - filesize);␊
315␊
316␉*load_addr = vmaddr;␊
317␉*load_size = vmsize;␊
318␊
319␉return 0;␊
320}␊
321␊
322␊
323//==============================================================================␊
324␊
325static long DecodeUnixThread(long cmdBase, unsigned int *entry)␊
326{␊
327␉switch (archCpuType)␊
328␉{␊
329␉␉case CPU_TYPE_I386:␊
330␉␉{␊
331␉␉␉i386_thread_state_t *i386ThreadState;␊
332␉␉␉i386ThreadState = (i386_thread_state_t *) (cmdBase + sizeof(struct thread_command) + 8);␊
333␊
334␉␉␉*entry = i386ThreadState->eip;␊
335␉␉␉return 0;␊
336␉␉}␊
337␉␉␉␊
338␉␉case CPU_TYPE_X86_64:␊
339␉␉{␊
340␉␉␉x86_thread_state64_t *x86_64ThreadState;␊
341␉␉␉x86_64ThreadState = (x86_thread_state64_t *) (cmdBase + sizeof(struct thread_command) + 8);␊
342␉␉␉*entry = x86_64ThreadState->rip;␊
343␉␉␉return 0;␊
344␉␉}␊
345␉␉␉␊
346␉␉default:␊
347␉␉␉error("Unknown CPU type\n");␊
348␉␉␉return -1;␊
349␉}␊
350}␊
351␊
352␊
353//==============================================================================␊
354␊
355static long DecodeSymbolTable(long cmdBase)␊
356{␊
357␉long tmpAddr, symsSize, totalSize;␊
358␉long gSymbolTableAddr;␊
359␉long gSymbolTableSize;␊
360␊
361␉struct symtab_command *symTab, *symTableSave;␊
362␊
363␉symTab = (struct symtab_command *)cmdBase;␊
364 ␊
365#if DEBUG␊
366␊
367␉printf("symoff: %x, nsyms: %x, stroff: %x, strsize: %x\n", symTab->symoff, symTab->nsyms, symTab->stroff, symTab->strsize);␊
368␉getchar();␊
369#endif␊
370 ␊
371␉symsSize = symTab->stroff - symTab->symoff;␊
372␉totalSize = symsSize + symTab->strsize;␊
373 ␊
374␉gSymbolTableSize = totalSize + sizeof(struct symtab_command);␊
375␉gSymbolTableAddr = AllocateKernelMemory(gSymbolTableSize);␊
376␉// Add the SymTab to the memory-map.␊
377␉AllocateMemoryRange("Kernel-__SYMTAB", gSymbolTableAddr, gSymbolTableSize, -1);␊
378 ␊
379␉symTableSave = (struct symtab_command *)gSymbolTableAddr;␊
380␉tmpAddr = gSymbolTableAddr + sizeof(struct symtab_command);␊
381 ␊
382␉symTableSave->symoff = tmpAddr;␊
383␉symTableSave->nsyms = symTab->nsyms;␊
384␉symTableSave->stroff = tmpAddr + symsSize;␊
385␉symTableSave->strsize = symTab->strsize;␊
386␉␊
387␉bcopy((char *)(gBinaryAddress + symTab->symoff), (char *)tmpAddr, totalSize);␊
388␊
389␉return 0;␊
390}␊
391

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