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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);␊
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, 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);␊
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␊
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//===================================================␊
293␊
294␉if (vmsize == 0 || filesize == 0)␊
295␉{␊
296␉␉*load_addr = ~0;␊
297␉␉*load_size = 0;␊
298␉␉return 0;␊
299␉}␊
300␊
301␉if (! ((vmaddr >= KERNEL_ADDR && (vmaddr + vmsize) <= (KERNEL_ADDR + KERNEL_LEN)) ||␊
302␉␉ (vmaddr >= HIB_ADDR && (vmaddr + vmsize) <= (HIB_ADDR + HIB_LEN))))␊
303␉{␊
304␉␉stop("Kernel overflows available space");␊
305␉}␊
306␊
307␉if (vmsize && ((strncmp(segname, "__PRELINK_INFO", sizeof("__PRELINK_INFO")) == 0) || (strncmp(segname, "__PRELINK", sizeof("__PRELINK")) == 0)))␊
308␉{␊
309␉␉gHaveKernelCache = true;␊
310␉}␊
311␊
312␉// Copy from file load area.␊
313␉if (vmsize>0 && filesize > 0)␊
314␉{␊
315␉␉bcopy((char *)fileaddr, (char *)vmaddr, vmsize > filesize ? filesize : vmsize);␊
316␉}␊
317␊
318␉// Zero space at the end of the segment.␊
319␉if (vmsize > filesize)␊
320␉{␊
321␉␉bzero((char *)(vmaddr + filesize), vmsize - filesize);␊
322␉}␊
323␊
324␉*load_addr = vmaddr;␊
325␉*load_size = vmsize;␊
326␊
327␉return 0;␊
328}␊
329␊
330//==============================================================================␊
331␊
332static long DecodeUnixThread(long cmdBase, unsigned int *entry)␊
333{␊
334␉switch (archCpuType)␊
335␉{␊
336␉␉case CPU_TYPE_I386:␊
337␉␉{␊
338␉␉␉i386_thread_state_t *i386ThreadState;␊
339␉␉␉i386ThreadState = (i386_thread_state_t *) (cmdBase + sizeof(struct thread_command) + 8);␊
340␊
341␉␉␉*entry = i386ThreadState->eip;␊
342␉␉␉return 0;␊
343␉␉}␊
344␉␉␉␊
345␉␉case CPU_TYPE_X86_64:␊
346␉␉{␊
347␉␉␉x86_thread_state64_t *x86_64ThreadState;␊
348␉␉␉x86_64ThreadState = (x86_thread_state64_t *) (cmdBase + sizeof(struct thread_command) + 8);␊
349␉␉␉*entry = x86_64ThreadState->rip;␊
350␉␉␉return 0;␊
351␉␉}␊
352␉␉␉␊
353␉␉default:␊
354␉␉␉error("Unknown CPU type\n");␊
355␉␉␉return -1;␊
356␉}␊
357}␊
358␊
359␊
360//==============================================================================␊
361␊
362static long DecodeSymbolTable(long cmdBase)␊
363{␊
364␉long tmpAddr, symsSize, totalSize;␊
365␉long gSymbolTableAddr;␊
366␉long gSymbolTableSize;␊
367␊
368␉struct symtab_command *symTab, *symTableSave;␊
369␊
370␉symTab = (struct symtab_command *)cmdBase;␊
371␊
372#if DEBUG␊
373␉printf("symoff: %x, nsyms: %x, stroff: %x, strsize: %x\n",␊
374␉␉symTab->symoff, symTab->nsyms, symTab->stroff, symTab->strsize);␊
375␉getchar();␊
376#endif␊
377␊
378␉symsSize = symTab->stroff - symTab->symoff;␊
379␉totalSize = symsSize + symTab->strsize;␊
380␊
381␉gSymbolTableSize = totalSize + sizeof(struct symtab_command);␊
382␉gSymbolTableAddr = AllocateKernelMemory(gSymbolTableSize);␊
383␉// Add the SymTab to the memory-map.␊
384␉AllocateMemoryRange("Kernel-__SYMTAB", gSymbolTableAddr, gSymbolTableSize, -1);␊
385␊
386␉symTableSave = (struct symtab_command *)gSymbolTableAddr;␊
387␉tmpAddr = gSymbolTableAddr + sizeof(struct symtab_command);␊
388␊
389␉symTableSave->symoff = tmpAddr;␊
390␉symTableSave->nsyms = symTab->nsyms;␊
391␉symTableSave->stroff = tmpAddr + symsSize;␊
392␉symTableSave->strsize = symTab->strsize;␊
393␉␊
394␉bcopy((char *)(gBinaryAddress + symTab->symoff), (char *)tmpAddr, totalSize);␊
395␊
396␉return 0;␊
397}␊
398

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