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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 * 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// Private functions.␊
41static long DecodeSegment(long cmdBase, unsigned int *load_addr, unsigned int *load_size, void *binary, u_int32_t uncompressed_size);␊
42static long DecodeUnixThread(long cmdBase, unsigned int *entry);␊
43static long DecodeSymbolTable(long cmdBase);␊
44␊
45␊
46static unsigned long gBinaryAddress;␊
47bool gHaveKernelCache;␉␉␉/* XXX aserebln: uninitialized? and only set to true, never to false */␊
48cpu_type_t archCpuType = CPU_TYPE_I386;␊
49␊
50␊
51//==============================================================================␊
52// Public function.␊
53␊
54long ThinFatFile(void **binary, unsigned long *length)␊
55{␊
56␉unsigned long nfat, swapped, size = 0;␊
57␉struct fat_header *fhp = (struct fat_header *)*binary;␊
58␉struct fat_arch *fap = (struct fat_arch *)((unsigned long)*binary + sizeof(struct fat_header));␊
59␉cpu_type_t fapcputype;␊
60␉uint32_t fapoffset;␊
61␉uint32_t fapsize;␊
62␊
63␉if (fhp->magic == FAT_MAGIC)/* 0xcafebabe */␊
64␉{␊
65␉␉nfat = fhp->nfat_arch;␊
66␉␉swapped = 0;␊
67␉}␊
68␉else if (fhp->magic == FAT_CIGAM)/* 0xbebafeca */␊
69␉{␊
70␉␉nfat = OSSwapInt32(fhp->nfat_arch);␊
71␉␉swapped = 1;␊
72␉}␊
73␉else␊
74␉{␊
75␉␉return -1;␊
76␉}␊
77␊
78␉for (; nfat > 0; nfat--, fap++)␊
79␉{␊
80␉␉if (swapped)␊
81␉␉{␊
82␉␉␉fapcputype = OSSwapInt32(fap->cputype);␊
83␉␉␉fapoffset = OSSwapInt32(fap->offset);␊
84␉␉␉fapsize = OSSwapInt32(fap->size);␊
85␉␉}␊
86␉␉else␊
87␉␉{␊
88␉␉␉fapcputype = fap->cputype;␊
89␉␉␉fapoffset = fap->offset;␊
90␉␉␉fapsize = fap->size;␊
91␉␉}␊
92␊
93␉␉if (fapcputype == archCpuType)␊
94␉␉{␊
95␉␉␉*binary = (void *) ((unsigned long)*binary + fapoffset);␊
96␉␉␉size = fapsize;␊
97␉␉␉break;␊
98␉␉}␊
99␉}␊
100␊
101␉if (length != 0)␊
102␉{␊
103␉␉*length = size;␊
104␉}␊
105␊
106␉return 0;␊
107}␊
108␊
109␊
110//==============================================================================␊
111␊
112long DecodeMachO(void *binary, u_int32_t uncompressed_size, entry_t *rentry, char **raddr, int *rsize)␊
113{␊
114␉struct mach_header *mH;␊
115␉unsigned long ncmds, cmdBase, cmd, cmdsize, cmdstart;␊
116␉// long headerBase, headerAddr, headerSize;␊
117␉unsigned int vmaddr = ~0;␊
118␉unsigned int vmend = 0;␊
119␉unsigned long cnt;␊
120␉long ret = -1;␊
121␉unsigned int entry = 0;␊
122␊
123␉gBinaryAddress = (unsigned long)binary;␊
124␊
125␉mH = (struct mach_header *)(gBinaryAddress);␊
126␊
127/*#if DEBUG␊
128␉DBG("magic: 0x%x\n", (unsigned)mH->magic);␊
129␉DBG("cputype: 0x%x\n", (unsigned)mH->cputype);␊
130␉DBG("cpusubtype: 0x%x\n", (unsigned)mH->cpusubtype);␊
131␉DBG("filetype: 0x%x\n", (unsigned)mH->filetype);␊
132␉DBG("ncmds: 0x%x\n", (unsigned)mH->ncmds);␊
133␉DBG("sizeofcmds: 0x%x\n", (unsigned)mH->sizeofcmds);␊
134␉DBG("flags: 0x%x\n", (unsigned)mH->flags);␊
135␉DBG("archCpuType: 0x%x\n", archCpuType);␊
136␉//getchar();␊
137#endif*/␊
138␊
139␉switch (archCpuType)␊
140␉{␊
141␉␉case CPU_TYPE_I386:␊
142␊
143␉␉␉if (mH->magic != MH_MAGIC)␊
144␉␉␉{␊
145␉␉␉␉error("Mach-O (i386) file has bad magic number\n");␊
146␉␉␉␉return -1;␊
147␉␉␉}␊
148␊
149␉␉␉cmdstart = (unsigned long)gBinaryAddress + sizeof(struct mach_header);␊
150␉␉␉break;␊
151␊
152␉␉case CPU_TYPE_X86_64:␊
153/*␊
154␉␉␉if (mH->magic != MH_MAGIC_64 && mH->magic == MH_MAGIC)␊
155␉␉␉{␊
156␉␉␉␉return -1;␊
157␉␉␉}␊
158*/␊
159␉␉␉if (mH->magic != MH_MAGIC_64)␊
160␉␉␉{␊
161␉␉␉␉error("Mach-O file (x86_64) has bad magic number\n");␊
162␉␉␉␉return -1;␊
163␉␉␉}␊
164␊
165␉␉␉cmdstart = (unsigned long)gBinaryAddress + sizeof(struct mach_header_64);␊
166␉␉␉break;␊
167␊
168␉␉default:␊
169␊
170␉␉␉error("Unknown CPU type\n");␊
171␉␉␉return -1;␊
172␉}␊
173␊
174␉cmdBase = cmdstart;␊
175␉ncmds = mH->ncmds;␊
176␊
177␉for (cnt = 0; cnt < ncmds; cnt++)␊
178␉{␊
179␉␉cmd = ((long *)cmdBase)[0];␊
180␉␉cmdsize = ((long *)cmdBase)[1];␊
181␉␉unsigned int load_addr;␊
182␉␉unsigned int load_size;␊
183␊
184␉␉switch (cmd)␊
185␉␉{␊
186␉␉␉case LC_SEGMENT:␊
187␉␉␉case LC_SEGMENT_64:␊
188␉␉␉ret = DecodeSegment(cmdBase, &load_addr, &load_size, binary, uncompressed_size);␊
189␊
190␉␉␉if (ret == 0 && load_size != 0 && load_addr >= KERNEL_ADDR)␊
191␉␉␉{␊
192␉␉␉␉vmaddr = MIN(vmaddr, load_addr);␊
193␉␉␉␉vmend = MAX(vmend, load_addr + load_size);␊
194␉␉␉}␊
195␉␉␉break;␊
196␊
197␉␉␉case LC_MAIN:␉/* Mountain Lion's replacement for LC_UNIXTHREAD */␊
198␉␉␉case LC_UNIXTHREAD:␊
199␉␉␉␉ret = DecodeUnixThread(cmdBase, &entry);␊
200␉␉␉break;␊
201␊
202␉␉␉case LC_SYMTAB:␊
203␉␉␉break;␊
204␊
205␉␉␉default:␊
206#if NOTDEF␊
207␉␉␉printf("Ignoring cmd type %d.\n", (unsigned)cmd);␊
208#endif␊
209␉␉␉break;␊
210␉␉}␊
211␊
212␉if (ret != 0)␊
213␉{␊
214␉␉return -1;␊
215␉}␊
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␊
249static long DecodeSegment(long cmdBase, unsigned int *load_addr, unsigned int *load_size, void *binary, u_int32_t uncompressed_size)␊
250{␊
251␉char *segname;␊
252␉long vmsize, filesize;␊
253␉unsigned long vmaddr, fileoff, fileaddr;␊
254␊
255␉if (((long *)cmdBase)[0] == LC_SEGMENT_64)␊
256␉{␊
257␉␉struct segment_command_64 *segCmd;␊
258␉␉segCmd = (struct segment_command_64 *)cmdBase;␊
259␉␉vmaddr = (segCmd->vmaddr & 0x3fffffff);␊
260␉␉vmsize = segCmd->vmsize;␊
261␉␉fileoff = segCmd->fileoff;␊
262␉␉fileaddr = (gBinaryAddress + segCmd->fileoff);␊
263␉␉filesize = segCmd->filesize;␊
264␉␉segname = (char *)segCmd->segname;␊
265␊
266#ifdef DEBUG␊
267␉printf("segname: %s, vmaddr: %x, vmsize: %x, fileoff: %x, fileaddr: %x, filesize: %x, nsects: %d, flags: %x.\n",␊
268␉␉segCmd->segname, (unsigned)vmaddr, (unsigned)vmsize, segCmd->fileoff, (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␉␉fileoff = segCmd->fileoff;␊
282␉␉fileaddr = (gBinaryAddress + segCmd->fileoff);␊
283␉␉filesize = segCmd->filesize;␊
284␉␉segname = (char *)segCmd->segname;␊
285␊
286#ifdef DEBUG␊
287␉printf("segname: %s, vmaddr: %x, vmsize: %x, fileoff: %x, fileaddr: %x, filesize: %x, nsects: %d, flags: %x.\n",␊
288␉␉segCmd->segname, (unsigned)vmaddr, (unsigned)vmsize, segCmd->fileoff, (unsigned)fileaddr, (unsigned)filesize,␊
289␉␉(unsigned) segCmd->nsects, (unsigned)segCmd->flags);␊
290␉getchar();␊
291#endif␊
292␉}␊
293␊
294//===================================================␊
295␊
296␉if (vmsize == 0 || filesize == 0)␊
297␉{␊
298␉␉*load_addr = ~0;␊
299␉␉*load_size = 0;␊
300␉␉return 0;␊
301␉}␊
302␊
303␉if (! ((vmaddr >= KERNEL_ADDR && (vmaddr + vmsize) <= (KERNEL_ADDR + KERNEL_LEN)) ||␊
304␉␉ (vmaddr >= HIB_ADDR && (vmaddr + vmsize) <= (HIB_ADDR + HIB_LEN))))␊
305␉{␊
306␉␉stop("Kernel overflows available space");␊
307␉}␊
308␊
309␉if (vmsize && ((strncmp(segname, "__PRELINK_INFO", sizeof("__PRELINK_INFO")) == 0) || (strncmp(segname, "__PRELINK", sizeof("__PRELINK")) == 0)))␊
310␉{␊
311␉␉gHaveKernelCache = true;␊
312␉}␊
313␊
314␉// Copy from file load area.␊
315␉if (vmsize>0 && filesize > 0)␊
316␉{␊
317␉␉bcopy((char *)fileaddr, (char *)vmaddr, vmsize > filesize ? filesize : vmsize);␊
318␉}␊
319␊
320␉// Zero space at the end of the segment.␊
321␉if (vmsize > filesize)␊
322␉{␊
323␉␉bzero((char *)(vmaddr + filesize), vmsize - filesize);␊
324␉}␊
325␊
326␉*load_addr = vmaddr;␊
327␉*load_size = vmsize;␊
328␊
329␉return 0;␊
330}␊
331␊
332//==============================================================================␊
333␊
334static long DecodeUnixThread(long cmdBase, unsigned int *entry)␊
335{␊
336␉switch (archCpuType)␊
337␉{␊
338␉␉case CPU_TYPE_I386:␊
339␉␉{␊
340␉␉␉i386_thread_state_t *i386ThreadState;␊
341␉␉␉i386ThreadState = (i386_thread_state_t *) (cmdBase + sizeof(struct thread_command) + 8);␊
342␊
343␉␉␉*entry = i386ThreadState->eip;␊
344␉␉␉return 0;␊
345␉␉}␊
346␉␉␉␊
347␉␉case CPU_TYPE_X86_64:␊
348␉␉{␊
349␉␉␉x86_thread_state64_t *x86_64ThreadState;␊
350␉␉␉x86_64ThreadState = (x86_thread_state64_t *) (cmdBase + sizeof(struct thread_command) + 8);␊
351␉␉␉*entry = x86_64ThreadState->rip;␊
352␉␉␉return 0;␊
353␉␉}␊
354␉␉␉␊
355␉␉default:␊
356␉␉␉error("Unknown CPU type\n");␊
357␉␉␉return -1;␊
358␉}␊
359}␊
360␊
361␊
362//==============================================================================␊
363␊
364static long DecodeSymbolTable(long cmdBase)␊
365{␊
366␉long tmpAddr, symsSize, totalSize;␊
367␉long gSymbolTableAddr;␊
368␉long gSymbolTableSize;␊
369␊
370␉struct symtab_command *symTab, *symTableSave;␊
371␊
372␉symTab = (struct symtab_command *)cmdBase;␊
373␊
374#if DEBUG␊
375␉printf("symoff: %x, nsyms: %x, stroff: %x, strsize: %x\n",␊
376␉␉symTab->symoff, symTab->nsyms, symTab->stroff, symTab->strsize);␊
377␉getchar();␊
378#endif␊
379␊
380␉symsSize = symTab->stroff - symTab->symoff;␊
381␉totalSize = symsSize + symTab->strsize;␊
382␊
383␉gSymbolTableSize = totalSize + sizeof(struct symtab_command);␊
384␉gSymbolTableAddr = AllocateKernelMemory(gSymbolTableSize);␊
385␉// Add the SymTab to the memory-map.␊
386␉AllocateMemoryRange("Kernel-__SYMTAB", gSymbolTableAddr, gSymbolTableSize, -1);␊
387␊
388␉symTableSave = (struct symtab_command *)gSymbolTableAddr;␊
389␉tmpAddr = gSymbolTableAddr + sizeof(struct symtab_command);␊
390␊
391␉symTableSave->symoff = tmpAddr;␊
392␉symTableSave->nsyms = symTab->nsyms;␊
393␉symTableSave->stroff = tmpAddr + symsSize;␊
394␉symTableSave->strsize = symTab->strsize;␊
395␉␊
396␉bcopy((char *)(gBinaryAddress + symTab->symoff), (char *)tmpAddr, totalSize);␊
397␊
398␉return 0;␊
399}␊
400

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