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1.1 root 1: /* This is the Linux kernel elf-loading code, ported into user space */
2:
3: #include <stdio.h>
4: #include <sys/types.h>
5: #include <fcntl.h>
6: #include <errno.h>
7: #include <unistd.h>
8: #include <sys/mman.h>
9: #include <stdlib.h>
10: #include <string.h>
11:
12: #include "qemu.h"
13: #include "disas.h"
14:
15: #ifdef _ARCH_PPC64
16: #undef ARCH_DLINFO
17: #undef ELF_PLATFORM
18: #undef ELF_HWCAP
19: #undef ELF_CLASS
20: #undef ELF_DATA
21: #undef ELF_ARCH
22: #endif
23:
24: /* from personality.h */
25:
26: /*
27: * Flags for bug emulation.
28: *
29: * These occupy the top three bytes.
30: */
31: enum {
32: ADDR_NO_RANDOMIZE = 0x0040000, /* disable randomization of VA space */
33: FDPIC_FUNCPTRS = 0x0080000, /* userspace function ptrs point to descriptors
34: * (signal handling)
35: */
36: MMAP_PAGE_ZERO = 0x0100000,
37: ADDR_COMPAT_LAYOUT = 0x0200000,
38: READ_IMPLIES_EXEC = 0x0400000,
39: ADDR_LIMIT_32BIT = 0x0800000,
40: SHORT_INODE = 0x1000000,
41: WHOLE_SECONDS = 0x2000000,
42: STICKY_TIMEOUTS = 0x4000000,
43: ADDR_LIMIT_3GB = 0x8000000,
44: };
45:
46: /*
47: * Personality types.
48: *
49: * These go in the low byte. Avoid using the top bit, it will
50: * conflict with error returns.
51: */
52: enum {
53: PER_LINUX = 0x0000,
54: PER_LINUX_32BIT = 0x0000 | ADDR_LIMIT_32BIT,
55: PER_LINUX_FDPIC = 0x0000 | FDPIC_FUNCPTRS,
56: PER_SVR4 = 0x0001 | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
57: PER_SVR3 = 0x0002 | STICKY_TIMEOUTS | SHORT_INODE,
58: PER_SCOSVR3 = 0x0003 | STICKY_TIMEOUTS |
59: WHOLE_SECONDS | SHORT_INODE,
60: PER_OSR5 = 0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS,
61: PER_WYSEV386 = 0x0004 | STICKY_TIMEOUTS | SHORT_INODE,
62: PER_ISCR4 = 0x0005 | STICKY_TIMEOUTS,
63: PER_BSD = 0x0006,
64: PER_SUNOS = 0x0006 | STICKY_TIMEOUTS,
65: PER_XENIX = 0x0007 | STICKY_TIMEOUTS | SHORT_INODE,
66: PER_LINUX32 = 0x0008,
67: PER_LINUX32_3GB = 0x0008 | ADDR_LIMIT_3GB,
68: PER_IRIX32 = 0x0009 | STICKY_TIMEOUTS,/* IRIX5 32-bit */
69: PER_IRIXN32 = 0x000a | STICKY_TIMEOUTS,/* IRIX6 new 32-bit */
70: PER_IRIX64 = 0x000b | STICKY_TIMEOUTS,/* IRIX6 64-bit */
71: PER_RISCOS = 0x000c,
72: PER_SOLARIS = 0x000d | STICKY_TIMEOUTS,
73: PER_UW7 = 0x000e | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
74: PER_OSF4 = 0x000f, /* OSF/1 v4 */
75: PER_HPUX = 0x0010,
76: PER_MASK = 0x00ff,
77: };
78:
79: /*
80: * Return the base personality without flags.
81: */
82: #define personality(pers) (pers & PER_MASK)
83:
84: /* this flag is uneffective under linux too, should be deleted */
85: #ifndef MAP_DENYWRITE
86: #define MAP_DENYWRITE 0
87: #endif
88:
89: /* should probably go in elf.h */
90: #ifndef ELIBBAD
91: #define ELIBBAD 80
92: #endif
93:
94: #ifdef TARGET_I386
95:
96: #define ELF_PLATFORM get_elf_platform()
97:
98: static const char *get_elf_platform(void)
99: {
100: static char elf_platform[] = "i386";
101: int family = (thread_env->cpuid_version >> 8) & 0xff;
102: if (family > 6)
103: family = 6;
104: if (family >= 3)
105: elf_platform[1] = '0' + family;
106: return elf_platform;
107: }
108:
109: #define ELF_HWCAP get_elf_hwcap()
110:
111: static uint32_t get_elf_hwcap(void)
112: {
113: return thread_env->cpuid_features;
114: }
115:
116: #ifdef TARGET_X86_64
117: #define ELF_START_MMAP 0x2aaaaab000ULL
118: #define elf_check_arch(x) ( ((x) == ELF_ARCH) )
119:
120: #define ELF_CLASS ELFCLASS64
121: #define ELF_DATA ELFDATA2LSB
122: #define ELF_ARCH EM_X86_64
123:
124: static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
125: {
126: regs->rax = 0;
127: regs->rsp = infop->start_stack;
128: regs->rip = infop->entry;
1.1.1.3 root 129: if (bsd_type == target_freebsd) {
130: regs->rdi = infop->start_stack;
131: }
1.1 root 132: }
133:
134: #else
135:
136: #define ELF_START_MMAP 0x80000000
137:
138: /*
139: * This is used to ensure we don't load something for the wrong architecture.
140: */
141: #define elf_check_arch(x) ( ((x) == EM_386) || ((x) == EM_486) )
142:
143: /*
144: * These are used to set parameters in the core dumps.
145: */
146: #define ELF_CLASS ELFCLASS32
147: #define ELF_DATA ELFDATA2LSB
148: #define ELF_ARCH EM_386
149:
150: static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
151: {
152: regs->esp = infop->start_stack;
153: regs->eip = infop->entry;
154:
155: /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program
156: starts %edx contains a pointer to a function which might be
157: registered using `atexit'. This provides a mean for the
158: dynamic linker to call DT_FINI functions for shared libraries
159: that have been loaded before the code runs.
160:
161: A value of 0 tells we have no such handler. */
162: regs->edx = 0;
163: }
164: #endif
165:
166: #define USE_ELF_CORE_DUMP
167: #define ELF_EXEC_PAGESIZE 4096
168:
169: #endif
170:
171: #ifdef TARGET_ARM
172:
173: #define ELF_START_MMAP 0x80000000
174:
175: #define elf_check_arch(x) ( (x) == EM_ARM )
176:
177: #define ELF_CLASS ELFCLASS32
178: #ifdef TARGET_WORDS_BIGENDIAN
179: #define ELF_DATA ELFDATA2MSB
180: #else
181: #define ELF_DATA ELFDATA2LSB
182: #endif
183: #define ELF_ARCH EM_ARM
184:
185: static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
186: {
187: abi_long stack = infop->start_stack;
188: memset(regs, 0, sizeof(*regs));
189: regs->ARM_cpsr = 0x10;
190: if (infop->entry & 1)
191: regs->ARM_cpsr |= CPSR_T;
192: regs->ARM_pc = infop->entry & 0xfffffffe;
193: regs->ARM_sp = infop->start_stack;
194: /* FIXME - what to for failure of get_user()? */
195: get_user_ual(regs->ARM_r2, stack + 8); /* envp */
196: get_user_ual(regs->ARM_r1, stack + 4); /* envp */
197: /* XXX: it seems that r0 is zeroed after ! */
198: regs->ARM_r0 = 0;
199: /* For uClinux PIC binaries. */
200: /* XXX: Linux does this only on ARM with no MMU (do we care ?) */
201: regs->ARM_r10 = infop->start_data;
202: }
203:
204: #define USE_ELF_CORE_DUMP
205: #define ELF_EXEC_PAGESIZE 4096
206:
207: enum
208: {
209: ARM_HWCAP_ARM_SWP = 1 << 0,
210: ARM_HWCAP_ARM_HALF = 1 << 1,
211: ARM_HWCAP_ARM_THUMB = 1 << 2,
212: ARM_HWCAP_ARM_26BIT = 1 << 3,
213: ARM_HWCAP_ARM_FAST_MULT = 1 << 4,
214: ARM_HWCAP_ARM_FPA = 1 << 5,
215: ARM_HWCAP_ARM_VFP = 1 << 6,
216: ARM_HWCAP_ARM_EDSP = 1 << 7,
217: };
218:
219: #define ELF_HWCAP (ARM_HWCAP_ARM_SWP | ARM_HWCAP_ARM_HALF \
220: | ARM_HWCAP_ARM_THUMB | ARM_HWCAP_ARM_FAST_MULT \
221: | ARM_HWCAP_ARM_FPA | ARM_HWCAP_ARM_VFP)
222:
223: #endif
224:
225: #ifdef TARGET_SPARC
226: #ifdef TARGET_SPARC64
227:
228: #define ELF_START_MMAP 0x80000000
229:
230: #ifndef TARGET_ABI32
231: #define elf_check_arch(x) ( (x) == EM_SPARCV9 || (x) == EM_SPARC32PLUS )
232: #else
233: #define elf_check_arch(x) ( (x) == EM_SPARC32PLUS || (x) == EM_SPARC )
234: #endif
235:
236: #define ELF_CLASS ELFCLASS64
237: #define ELF_DATA ELFDATA2MSB
238: #define ELF_ARCH EM_SPARCV9
239:
240: #define STACK_BIAS 2047
241:
242: static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
243: {
244: #ifndef TARGET_ABI32
245: regs->tstate = 0;
246: #endif
247: regs->pc = infop->entry;
248: regs->npc = regs->pc + 4;
249: regs->y = 0;
250: #ifdef TARGET_ABI32
251: regs->u_regs[14] = infop->start_stack - 16 * 4;
252: #else
253: if (personality(infop->personality) == PER_LINUX32)
254: regs->u_regs[14] = infop->start_stack - 16 * 4;
1.1.1.3 root 255: else {
1.1 root 256: regs->u_regs[14] = infop->start_stack - 16 * 8 - STACK_BIAS;
1.1.1.3 root 257: if (bsd_type == target_freebsd) {
258: regs->u_regs[8] = infop->start_stack;
259: regs->u_regs[11] = infop->start_stack;
260: }
261: }
1.1 root 262: #endif
263: }
264:
265: #else
266: #define ELF_START_MMAP 0x80000000
267:
268: #define elf_check_arch(x) ( (x) == EM_SPARC )
269:
270: #define ELF_CLASS ELFCLASS32
271: #define ELF_DATA ELFDATA2MSB
272: #define ELF_ARCH EM_SPARC
273:
274: static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
275: {
276: regs->psr = 0;
277: regs->pc = infop->entry;
278: regs->npc = regs->pc + 4;
279: regs->y = 0;
280: regs->u_regs[14] = infop->start_stack - 16 * 4;
281: }
282:
283: #endif
284: #endif
285:
286: #ifdef TARGET_PPC
287:
288: #define ELF_START_MMAP 0x80000000
289:
290: #if defined(TARGET_PPC64) && !defined(TARGET_ABI32)
291:
292: #define elf_check_arch(x) ( (x) == EM_PPC64 )
293:
294: #define ELF_CLASS ELFCLASS64
295:
296: #else
297:
298: #define elf_check_arch(x) ( (x) == EM_PPC )
299:
300: #define ELF_CLASS ELFCLASS32
301:
302: #endif
303:
304: #ifdef TARGET_WORDS_BIGENDIAN
305: #define ELF_DATA ELFDATA2MSB
306: #else
307: #define ELF_DATA ELFDATA2LSB
308: #endif
309: #define ELF_ARCH EM_PPC
310:
311: /*
312: * We need to put in some extra aux table entries to tell glibc what
313: * the cache block size is, so it can use the dcbz instruction safely.
314: */
315: #define AT_DCACHEBSIZE 19
316: #define AT_ICACHEBSIZE 20
317: #define AT_UCACHEBSIZE 21
318: /* A special ignored type value for PPC, for glibc compatibility. */
319: #define AT_IGNOREPPC 22
320: /*
321: * The requirements here are:
322: * - keep the final alignment of sp (sp & 0xf)
323: * - make sure the 32-bit value at the first 16 byte aligned position of
324: * AUXV is greater than 16 for glibc compatibility.
325: * AT_IGNOREPPC is used for that.
326: * - for compatibility with glibc ARCH_DLINFO must always be defined on PPC,
327: * even if DLINFO_ARCH_ITEMS goes to zero or is undefined.
328: */
329: #define DLINFO_ARCH_ITEMS 5
330: #define ARCH_DLINFO \
331: do { \
332: NEW_AUX_ENT(AT_DCACHEBSIZE, 0x20); \
333: NEW_AUX_ENT(AT_ICACHEBSIZE, 0x20); \
334: NEW_AUX_ENT(AT_UCACHEBSIZE, 0); \
335: /* \
336: * Now handle glibc compatibility. \
337: */ \
338: NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \
339: NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \
340: } while (0)
341:
342: static inline void init_thread(struct target_pt_regs *_regs, struct image_info *infop)
343: {
344: abi_ulong pos = infop->start_stack;
345: abi_ulong tmp;
346: #if defined(TARGET_PPC64) && !defined(TARGET_ABI32)
347: abi_ulong entry, toc;
348: #endif
349:
350: _regs->gpr[1] = infop->start_stack;
351: #if defined(TARGET_PPC64) && !defined(TARGET_ABI32)
352: entry = ldq_raw(infop->entry) + infop->load_addr;
353: toc = ldq_raw(infop->entry + 8) + infop->load_addr;
354: _regs->gpr[2] = toc;
355: infop->entry = entry;
356: #endif
357: _regs->nip = infop->entry;
358: /* Note that isn't exactly what regular kernel does
359: * but this is what the ABI wants and is needed to allow
360: * execution of PPC BSD programs.
361: */
362: /* FIXME - what to for failure of get_user()? */
363: get_user_ual(_regs->gpr[3], pos);
364: pos += sizeof(abi_ulong);
365: _regs->gpr[4] = pos;
366: for (tmp = 1; tmp != 0; pos += sizeof(abi_ulong))
367: tmp = ldl(pos);
368: _regs->gpr[5] = pos;
369: }
370:
371: #define USE_ELF_CORE_DUMP
372: #define ELF_EXEC_PAGESIZE 4096
373:
374: #endif
375:
376: #ifdef TARGET_MIPS
377:
378: #define ELF_START_MMAP 0x80000000
379:
380: #define elf_check_arch(x) ( (x) == EM_MIPS )
381:
382: #ifdef TARGET_MIPS64
383: #define ELF_CLASS ELFCLASS64
384: #else
385: #define ELF_CLASS ELFCLASS32
386: #endif
387: #ifdef TARGET_WORDS_BIGENDIAN
388: #define ELF_DATA ELFDATA2MSB
389: #else
390: #define ELF_DATA ELFDATA2LSB
391: #endif
392: #define ELF_ARCH EM_MIPS
393:
394: static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
395: {
396: regs->cp0_status = 2 << CP0St_KSU;
397: regs->cp0_epc = infop->entry;
398: regs->regs[29] = infop->start_stack;
399: }
400:
401: #define USE_ELF_CORE_DUMP
402: #define ELF_EXEC_PAGESIZE 4096
403:
404: #endif /* TARGET_MIPS */
405:
406: #ifdef TARGET_SH4
407:
408: #define ELF_START_MMAP 0x80000000
409:
410: #define elf_check_arch(x) ( (x) == EM_SH )
411:
412: #define ELF_CLASS ELFCLASS32
413: #define ELF_DATA ELFDATA2LSB
414: #define ELF_ARCH EM_SH
415:
416: static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
417: {
418: /* Check other registers XXXXX */
419: regs->pc = infop->entry;
420: regs->regs[15] = infop->start_stack;
421: }
422:
423: #define USE_ELF_CORE_DUMP
424: #define ELF_EXEC_PAGESIZE 4096
425:
426: #endif
427:
428: #ifdef TARGET_CRIS
429:
430: #define ELF_START_MMAP 0x80000000
431:
432: #define elf_check_arch(x) ( (x) == EM_CRIS )
433:
434: #define ELF_CLASS ELFCLASS32
435: #define ELF_DATA ELFDATA2LSB
436: #define ELF_ARCH EM_CRIS
437:
438: static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
439: {
440: regs->erp = infop->entry;
441: }
442:
443: #define USE_ELF_CORE_DUMP
444: #define ELF_EXEC_PAGESIZE 8192
445:
446: #endif
447:
448: #ifdef TARGET_M68K
449:
450: #define ELF_START_MMAP 0x80000000
451:
452: #define elf_check_arch(x) ( (x) == EM_68K )
453:
454: #define ELF_CLASS ELFCLASS32
455: #define ELF_DATA ELFDATA2MSB
456: #define ELF_ARCH EM_68K
457:
458: /* ??? Does this need to do anything?
459: #define ELF_PLAT_INIT(_r) */
460:
461: static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
462: {
463: regs->usp = infop->start_stack;
464: regs->sr = 0;
465: regs->pc = infop->entry;
466: }
467:
468: #define USE_ELF_CORE_DUMP
469: #define ELF_EXEC_PAGESIZE 8192
470:
471: #endif
472:
473: #ifdef TARGET_ALPHA
474:
475: #define ELF_START_MMAP (0x30000000000ULL)
476:
477: #define elf_check_arch(x) ( (x) == ELF_ARCH )
478:
479: #define ELF_CLASS ELFCLASS64
480: #define ELF_DATA ELFDATA2MSB
481: #define ELF_ARCH EM_ALPHA
482:
483: static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
484: {
485: regs->pc = infop->entry;
486: regs->ps = 8;
487: regs->usp = infop->start_stack;
488: regs->unique = infop->start_data; /* ? */
489: printf("Set unique value to " TARGET_FMT_lx " (" TARGET_FMT_lx ")\n",
490: regs->unique, infop->start_data);
491: }
492:
493: #define USE_ELF_CORE_DUMP
494: #define ELF_EXEC_PAGESIZE 8192
495:
496: #endif /* TARGET_ALPHA */
497:
498: #ifndef ELF_PLATFORM
499: #define ELF_PLATFORM (NULL)
500: #endif
501:
502: #ifndef ELF_HWCAP
503: #define ELF_HWCAP 0
504: #endif
505:
506: #ifdef TARGET_ABI32
507: #undef ELF_CLASS
508: #define ELF_CLASS ELFCLASS32
509: #undef bswaptls
510: #define bswaptls(ptr) bswap32s(ptr)
511: #endif
512:
513: #include "elf.h"
514:
515: struct exec
516: {
517: unsigned int a_info; /* Use macros N_MAGIC, etc for access */
518: unsigned int a_text; /* length of text, in bytes */
519: unsigned int a_data; /* length of data, in bytes */
520: unsigned int a_bss; /* length of uninitialized data area, in bytes */
521: unsigned int a_syms; /* length of symbol table data in file, in bytes */
522: unsigned int a_entry; /* start address */
523: unsigned int a_trsize; /* length of relocation info for text, in bytes */
524: unsigned int a_drsize; /* length of relocation info for data, in bytes */
525: };
526:
527:
528: #define N_MAGIC(exec) ((exec).a_info & 0xffff)
529: #define OMAGIC 0407
530: #define NMAGIC 0410
531: #define ZMAGIC 0413
532: #define QMAGIC 0314
533:
534: /* max code+data+bss space allocated to elf interpreter */
535: #define INTERP_MAP_SIZE (32 * 1024 * 1024)
536:
537: /* max code+data+bss+brk space allocated to ET_DYN executables */
538: #define ET_DYN_MAP_SIZE (128 * 1024 * 1024)
539:
540: /* Necessary parameters */
541: #define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE
542: #define TARGET_ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE-1))
543: #define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE-1))
544:
545: #define INTERPRETER_NONE 0
546: #define INTERPRETER_AOUT 1
547: #define INTERPRETER_ELF 2
548:
549: #define DLINFO_ITEMS 12
550:
551: static inline void memcpy_fromfs(void * to, const void * from, unsigned long n)
552: {
553: memcpy(to, from, n);
554: }
555:
556: static int load_aout_interp(void * exptr, int interp_fd);
557:
558: #ifdef BSWAP_NEEDED
559: static void bswap_ehdr(struct elfhdr *ehdr)
560: {
561: bswap16s(&ehdr->e_type); /* Object file type */
562: bswap16s(&ehdr->e_machine); /* Architecture */
563: bswap32s(&ehdr->e_version); /* Object file version */
564: bswaptls(&ehdr->e_entry); /* Entry point virtual address */
565: bswaptls(&ehdr->e_phoff); /* Program header table file offset */
566: bswaptls(&ehdr->e_shoff); /* Section header table file offset */
567: bswap32s(&ehdr->e_flags); /* Processor-specific flags */
568: bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */
569: bswap16s(&ehdr->e_phentsize); /* Program header table entry size */
570: bswap16s(&ehdr->e_phnum); /* Program header table entry count */
571: bswap16s(&ehdr->e_shentsize); /* Section header table entry size */
572: bswap16s(&ehdr->e_shnum); /* Section header table entry count */
573: bswap16s(&ehdr->e_shstrndx); /* Section header string table index */
574: }
575:
576: static void bswap_phdr(struct elf_phdr *phdr)
577: {
578: bswap32s(&phdr->p_type); /* Segment type */
579: bswaptls(&phdr->p_offset); /* Segment file offset */
580: bswaptls(&phdr->p_vaddr); /* Segment virtual address */
581: bswaptls(&phdr->p_paddr); /* Segment physical address */
582: bswaptls(&phdr->p_filesz); /* Segment size in file */
583: bswaptls(&phdr->p_memsz); /* Segment size in memory */
584: bswap32s(&phdr->p_flags); /* Segment flags */
585: bswaptls(&phdr->p_align); /* Segment alignment */
586: }
587:
588: static void bswap_shdr(struct elf_shdr *shdr)
589: {
590: bswap32s(&shdr->sh_name);
591: bswap32s(&shdr->sh_type);
592: bswaptls(&shdr->sh_flags);
593: bswaptls(&shdr->sh_addr);
594: bswaptls(&shdr->sh_offset);
595: bswaptls(&shdr->sh_size);
596: bswap32s(&shdr->sh_link);
597: bswap32s(&shdr->sh_info);
598: bswaptls(&shdr->sh_addralign);
599: bswaptls(&shdr->sh_entsize);
600: }
601:
602: static void bswap_sym(struct elf_sym *sym)
603: {
604: bswap32s(&sym->st_name);
605: bswaptls(&sym->st_value);
606: bswaptls(&sym->st_size);
607: bswap16s(&sym->st_shndx);
608: }
609: #endif
610:
611: /*
612: * 'copy_elf_strings()' copies argument/envelope strings from user
613: * memory to free pages in kernel mem. These are in a format ready
614: * to be put directly into the top of new user memory.
615: *
616: */
617: static abi_ulong copy_elf_strings(int argc,char ** argv, void **page,
618: abi_ulong p)
619: {
620: char *tmp, *tmp1, *pag = NULL;
621: int len, offset = 0;
622:
623: if (!p) {
624: return 0; /* bullet-proofing */
625: }
626: while (argc-- > 0) {
627: tmp = argv[argc];
628: if (!tmp) {
629: fprintf(stderr, "VFS: argc is wrong");
630: exit(-1);
631: }
632: tmp1 = tmp;
633: while (*tmp++);
634: len = tmp - tmp1;
635: if (p < len) { /* this shouldn't happen - 128kB */
636: return 0;
637: }
638: while (len) {
639: --p; --tmp; --len;
640: if (--offset < 0) {
641: offset = p % TARGET_PAGE_SIZE;
642: pag = (char *)page[p/TARGET_PAGE_SIZE];
643: if (!pag) {
1.1.1.5 ! root 644: pag = g_try_malloc0(TARGET_PAGE_SIZE);
1.1 root 645: page[p/TARGET_PAGE_SIZE] = pag;
646: if (!pag)
647: return 0;
648: }
649: }
650: if (len == 0 || offset == 0) {
651: *(pag + offset) = *tmp;
652: }
653: else {
654: int bytes_to_copy = (len > offset) ? offset : len;
655: tmp -= bytes_to_copy;
656: p -= bytes_to_copy;
657: offset -= bytes_to_copy;
658: len -= bytes_to_copy;
659: memcpy_fromfs(pag + offset, tmp, bytes_to_copy + 1);
660: }
661: }
662: }
663: return p;
664: }
665:
666: static abi_ulong setup_arg_pages(abi_ulong p, struct linux_binprm *bprm,
667: struct image_info *info)
668: {
669: abi_ulong stack_base, size, error;
670: int i;
671:
672: /* Create enough stack to hold everything. If we don't use
673: * it for args, we'll use it for something else...
674: */
675: size = x86_stack_size;
676: if (size < MAX_ARG_PAGES*TARGET_PAGE_SIZE)
677: size = MAX_ARG_PAGES*TARGET_PAGE_SIZE;
678: error = target_mmap(0,
679: size + qemu_host_page_size,
680: PROT_READ | PROT_WRITE,
681: MAP_PRIVATE | MAP_ANON,
682: -1, 0);
683: if (error == -1) {
684: perror("stk mmap");
685: exit(-1);
686: }
687: /* we reserve one extra page at the top of the stack as guard */
688: target_mprotect(error + size, qemu_host_page_size, PROT_NONE);
689:
690: stack_base = error + size - MAX_ARG_PAGES*TARGET_PAGE_SIZE;
691: p += stack_base;
692:
693: for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
694: if (bprm->page[i]) {
695: info->rss++;
696: /* FIXME - check return value of memcpy_to_target() for failure */
697: memcpy_to_target(stack_base, bprm->page[i], TARGET_PAGE_SIZE);
1.1.1.5 ! root 698: g_free(bprm->page[i]);
1.1 root 699: }
700: stack_base += TARGET_PAGE_SIZE;
701: }
702: return p;
703: }
704:
705: static void set_brk(abi_ulong start, abi_ulong end)
706: {
707: /* page-align the start and end addresses... */
708: start = HOST_PAGE_ALIGN(start);
709: end = HOST_PAGE_ALIGN(end);
710: if (end <= start)
711: return;
712: if(target_mmap(start, end - start,
713: PROT_READ | PROT_WRITE | PROT_EXEC,
714: MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0) == -1) {
715: perror("cannot mmap brk");
716: exit(-1);
717: }
718: }
719:
720:
721: /* We need to explicitly zero any fractional pages after the data
722: section (i.e. bss). This would contain the junk from the file that
723: should not be in memory. */
724: static void padzero(abi_ulong elf_bss, abi_ulong last_bss)
725: {
726: abi_ulong nbyte;
727:
728: if (elf_bss >= last_bss)
729: return;
730:
731: /* XXX: this is really a hack : if the real host page size is
732: smaller than the target page size, some pages after the end
733: of the file may not be mapped. A better fix would be to
734: patch target_mmap(), but it is more complicated as the file
735: size must be known */
736: if (qemu_real_host_page_size < qemu_host_page_size) {
737: abi_ulong end_addr, end_addr1;
738: end_addr1 = (elf_bss + qemu_real_host_page_size - 1) &
739: ~(qemu_real_host_page_size - 1);
740: end_addr = HOST_PAGE_ALIGN(elf_bss);
741: if (end_addr1 < end_addr) {
742: mmap((void *)g2h(end_addr1), end_addr - end_addr1,
743: PROT_READ|PROT_WRITE|PROT_EXEC,
744: MAP_FIXED|MAP_PRIVATE|MAP_ANON, -1, 0);
745: }
746: }
747:
748: nbyte = elf_bss & (qemu_host_page_size-1);
749: if (nbyte) {
750: nbyte = qemu_host_page_size - nbyte;
751: do {
752: /* FIXME - what to do if put_user() fails? */
753: put_user_u8(0, elf_bss);
754: elf_bss++;
755: } while (--nbyte);
756: }
757: }
758:
759:
760: static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
761: struct elfhdr * exec,
762: abi_ulong load_addr,
763: abi_ulong load_bias,
764: abi_ulong interp_load_addr, int ibcs,
765: struct image_info *info)
766: {
767: abi_ulong sp;
768: int size;
769: abi_ulong u_platform;
770: const char *k_platform;
771: const int n = sizeof(elf_addr_t);
772:
773: sp = p;
774: u_platform = 0;
775: k_platform = ELF_PLATFORM;
776: if (k_platform) {
777: size_t len = strlen(k_platform) + 1;
778: sp -= (len + n - 1) & ~(n - 1);
779: u_platform = sp;
780: /* FIXME - check return value of memcpy_to_target() for failure */
781: memcpy_to_target(sp, k_platform, len);
782: }
783: /*
784: * Force 16 byte _final_ alignment here for generality.
785: */
786: sp = sp &~ (abi_ulong)15;
787: size = (DLINFO_ITEMS + 1) * 2;
788: if (k_platform)
789: size += 2;
790: #ifdef DLINFO_ARCH_ITEMS
791: size += DLINFO_ARCH_ITEMS * 2;
792: #endif
793: size += envc + argc + 2;
794: size += (!ibcs ? 3 : 1); /* argc itself */
795: size *= n;
796: if (size & 15)
797: sp -= 16 - (size & 15);
798:
799: /* This is correct because Linux defines
800: * elf_addr_t as Elf32_Off / Elf64_Off
801: */
802: #define NEW_AUX_ENT(id, val) do { \
803: sp -= n; put_user_ual(val, sp); \
804: sp -= n; put_user_ual(id, sp); \
805: } while(0)
806:
807: NEW_AUX_ENT (AT_NULL, 0);
808:
809: /* There must be exactly DLINFO_ITEMS entries here. */
810: NEW_AUX_ENT(AT_PHDR, (abi_ulong)(load_addr + exec->e_phoff));
811: NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof (struct elf_phdr)));
812: NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum));
813: NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(TARGET_PAGE_SIZE));
814: NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_load_addr));
815: NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0);
816: NEW_AUX_ENT(AT_ENTRY, load_bias + exec->e_entry);
817: NEW_AUX_ENT(AT_UID, (abi_ulong) getuid());
818: NEW_AUX_ENT(AT_EUID, (abi_ulong) geteuid());
819: NEW_AUX_ENT(AT_GID, (abi_ulong) getgid());
820: NEW_AUX_ENT(AT_EGID, (abi_ulong) getegid());
821: NEW_AUX_ENT(AT_HWCAP, (abi_ulong) ELF_HWCAP);
822: NEW_AUX_ENT(AT_CLKTCK, (abi_ulong) sysconf(_SC_CLK_TCK));
823: if (k_platform)
824: NEW_AUX_ENT(AT_PLATFORM, u_platform);
825: #ifdef ARCH_DLINFO
826: /*
827: * ARCH_DLINFO must come last so platform specific code can enforce
828: * special alignment requirements on the AUXV if necessary (eg. PPC).
829: */
830: ARCH_DLINFO;
831: #endif
832: #undef NEW_AUX_ENT
833:
834: sp = loader_build_argptr(envc, argc, sp, p, !ibcs);
835: return sp;
836: }
837:
838:
839: static abi_ulong load_elf_interp(struct elfhdr * interp_elf_ex,
840: int interpreter_fd,
841: abi_ulong *interp_load_addr)
842: {
843: struct elf_phdr *elf_phdata = NULL;
844: struct elf_phdr *eppnt;
845: abi_ulong load_addr = 0;
846: int load_addr_set = 0;
847: int retval;
848: abi_ulong last_bss, elf_bss;
849: abi_ulong error;
850: int i;
851:
852: elf_bss = 0;
853: last_bss = 0;
854: error = 0;
855:
856: #ifdef BSWAP_NEEDED
857: bswap_ehdr(interp_elf_ex);
858: #endif
859: /* First of all, some simple consistency checks */
860: if ((interp_elf_ex->e_type != ET_EXEC &&
861: interp_elf_ex->e_type != ET_DYN) ||
862: !elf_check_arch(interp_elf_ex->e_machine)) {
863: return ~((abi_ulong)0UL);
864: }
865:
866:
867: /* Now read in all of the header information */
868:
869: if (sizeof(struct elf_phdr) * interp_elf_ex->e_phnum > TARGET_PAGE_SIZE)
870: return ~(abi_ulong)0UL;
871:
872: elf_phdata = (struct elf_phdr *)
873: malloc(sizeof(struct elf_phdr) * interp_elf_ex->e_phnum);
874:
875: if (!elf_phdata)
876: return ~((abi_ulong)0UL);
877:
878: /*
879: * If the size of this structure has changed, then punt, since
880: * we will be doing the wrong thing.
881: */
882: if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr)) {
883: free(elf_phdata);
884: return ~((abi_ulong)0UL);
885: }
886:
887: retval = lseek(interpreter_fd, interp_elf_ex->e_phoff, SEEK_SET);
888: if(retval >= 0) {
889: retval = read(interpreter_fd,
890: (char *) elf_phdata,
891: sizeof(struct elf_phdr) * interp_elf_ex->e_phnum);
892: }
893: if (retval < 0) {
894: perror("load_elf_interp");
895: exit(-1);
896: free (elf_phdata);
897: return retval;
898: }
899: #ifdef BSWAP_NEEDED
900: eppnt = elf_phdata;
901: for (i=0; i<interp_elf_ex->e_phnum; i++, eppnt++) {
902: bswap_phdr(eppnt);
903: }
904: #endif
905:
906: if (interp_elf_ex->e_type == ET_DYN) {
907: /* in order to avoid hardcoding the interpreter load
908: address in qemu, we allocate a big enough memory zone */
909: error = target_mmap(0, INTERP_MAP_SIZE,
910: PROT_NONE, MAP_PRIVATE | MAP_ANON,
911: -1, 0);
912: if (error == -1) {
913: perror("mmap");
914: exit(-1);
915: }
916: load_addr = error;
917: load_addr_set = 1;
918: }
919:
920: eppnt = elf_phdata;
921: for(i=0; i<interp_elf_ex->e_phnum; i++, eppnt++)
922: if (eppnt->p_type == PT_LOAD) {
923: int elf_type = MAP_PRIVATE | MAP_DENYWRITE;
924: int elf_prot = 0;
925: abi_ulong vaddr = 0;
926: abi_ulong k;
927:
928: if (eppnt->p_flags & PF_R) elf_prot = PROT_READ;
929: if (eppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
930: if (eppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
931: if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) {
932: elf_type |= MAP_FIXED;
933: vaddr = eppnt->p_vaddr;
934: }
935: error = target_mmap(load_addr+TARGET_ELF_PAGESTART(vaddr),
936: eppnt->p_filesz + TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr),
937: elf_prot,
938: elf_type,
939: interpreter_fd,
940: eppnt->p_offset - TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr));
941:
942: if (error == -1) {
943: /* Real error */
944: close(interpreter_fd);
945: free(elf_phdata);
946: return ~((abi_ulong)0UL);
947: }
948:
949: if (!load_addr_set && interp_elf_ex->e_type == ET_DYN) {
950: load_addr = error;
951: load_addr_set = 1;
952: }
953:
954: /*
955: * Find the end of the file mapping for this phdr, and keep
956: * track of the largest address we see for this.
957: */
958: k = load_addr + eppnt->p_vaddr + eppnt->p_filesz;
959: if (k > elf_bss) elf_bss = k;
960:
961: /*
962: * Do the same thing for the memory mapping - between
963: * elf_bss and last_bss is the bss section.
964: */
965: k = load_addr + eppnt->p_memsz + eppnt->p_vaddr;
966: if (k > last_bss) last_bss = k;
967: }
968:
969: /* Now use mmap to map the library into memory. */
970:
971: close(interpreter_fd);
972:
973: /*
974: * Now fill out the bss section. First pad the last page up
975: * to the page boundary, and then perform a mmap to make sure
976: * that there are zeromapped pages up to and including the last
977: * bss page.
978: */
979: padzero(elf_bss, last_bss);
980: elf_bss = TARGET_ELF_PAGESTART(elf_bss + qemu_host_page_size - 1); /* What we have mapped so far */
981:
982: /* Map the last of the bss segment */
983: if (last_bss > elf_bss) {
984: target_mmap(elf_bss, last_bss-elf_bss,
985: PROT_READ|PROT_WRITE|PROT_EXEC,
986: MAP_FIXED|MAP_PRIVATE|MAP_ANON, -1, 0);
987: }
988: free(elf_phdata);
989:
990: *interp_load_addr = load_addr;
991: return ((abi_ulong) interp_elf_ex->e_entry) + load_addr;
992: }
993:
994: static int symfind(const void *s0, const void *s1)
995: {
1.1.1.5 ! root 996: target_ulong addr = *(target_ulong *)s0;
1.1 root 997: struct elf_sym *sym = (struct elf_sym *)s1;
998: int result = 0;
1.1.1.5 ! root 999: if (addr < sym->st_value) {
1.1 root 1000: result = -1;
1.1.1.5 ! root 1001: } else if (addr >= sym->st_value + sym->st_size) {
1.1 root 1002: result = 1;
1003: }
1004: return result;
1005: }
1006:
1007: static const char *lookup_symbolxx(struct syminfo *s, target_ulong orig_addr)
1008: {
1009: #if ELF_CLASS == ELFCLASS32
1010: struct elf_sym *syms = s->disas_symtab.elf32;
1011: #else
1012: struct elf_sym *syms = s->disas_symtab.elf64;
1013: #endif
1014:
1015: // binary search
1016: struct elf_sym *sym;
1017:
1.1.1.5 ! root 1018: sym = bsearch(&orig_addr, syms, s->disas_num_syms, sizeof(*syms), symfind);
1.1.1.2 root 1019: if (sym != NULL) {
1.1 root 1020: return s->disas_strtab + sym->st_name;
1021: }
1022:
1023: return "";
1024: }
1025:
1026: /* FIXME: This should use elf_ops.h */
1027: static int symcmp(const void *s0, const void *s1)
1028: {
1029: struct elf_sym *sym0 = (struct elf_sym *)s0;
1030: struct elf_sym *sym1 = (struct elf_sym *)s1;
1031: return (sym0->st_value < sym1->st_value)
1032: ? -1
1033: : ((sym0->st_value > sym1->st_value) ? 1 : 0);
1034: }
1035:
1036: /* Best attempt to load symbols from this ELF object. */
1037: static void load_symbols(struct elfhdr *hdr, int fd)
1038: {
1039: unsigned int i, nsyms;
1040: struct elf_shdr sechdr, symtab, strtab;
1041: char *strings;
1042: struct syminfo *s;
1.1.1.4 root 1043: struct elf_sym *syms, *new_syms;
1.1 root 1044:
1045: lseek(fd, hdr->e_shoff, SEEK_SET);
1046: for (i = 0; i < hdr->e_shnum; i++) {
1047: if (read(fd, &sechdr, sizeof(sechdr)) != sizeof(sechdr))
1048: return;
1049: #ifdef BSWAP_NEEDED
1050: bswap_shdr(&sechdr);
1051: #endif
1052: if (sechdr.sh_type == SHT_SYMTAB) {
1053: symtab = sechdr;
1054: lseek(fd, hdr->e_shoff
1055: + sizeof(sechdr) * sechdr.sh_link, SEEK_SET);
1056: if (read(fd, &strtab, sizeof(strtab))
1057: != sizeof(strtab))
1058: return;
1059: #ifdef BSWAP_NEEDED
1060: bswap_shdr(&strtab);
1061: #endif
1062: goto found;
1063: }
1064: }
1065: return; /* Shouldn't happen... */
1066:
1067: found:
1068: /* Now know where the strtab and symtab are. Snarf them. */
1069: s = malloc(sizeof(*s));
1070: syms = malloc(symtab.sh_size);
1.1.1.4 root 1071: if (!syms) {
1072: free(s);
1.1 root 1073: return;
1.1.1.4 root 1074: }
1.1 root 1075: s->disas_strtab = strings = malloc(strtab.sh_size);
1.1.1.4 root 1076: if (!s->disas_strtab) {
1077: free(s);
1078: free(syms);
1.1 root 1079: return;
1.1.1.4 root 1080: }
1.1 root 1081:
1082: lseek(fd, symtab.sh_offset, SEEK_SET);
1.1.1.4 root 1083: if (read(fd, syms, symtab.sh_size) != symtab.sh_size) {
1084: free(s);
1085: free(syms);
1086: free(strings);
1.1 root 1087: return;
1.1.1.4 root 1088: }
1.1 root 1089:
1090: nsyms = symtab.sh_size / sizeof(struct elf_sym);
1091:
1092: i = 0;
1093: while (i < nsyms) {
1094: #ifdef BSWAP_NEEDED
1095: bswap_sym(syms + i);
1096: #endif
1097: // Throw away entries which we do not need.
1098: if (syms[i].st_shndx == SHN_UNDEF ||
1099: syms[i].st_shndx >= SHN_LORESERVE ||
1100: ELF_ST_TYPE(syms[i].st_info) != STT_FUNC) {
1101: nsyms--;
1102: if (i < nsyms) {
1103: syms[i] = syms[nsyms];
1104: }
1105: continue;
1106: }
1107: #if defined(TARGET_ARM) || defined (TARGET_MIPS)
1108: /* The bottom address bit marks a Thumb or MIPS16 symbol. */
1109: syms[i].st_value &= ~(target_ulong)1;
1110: #endif
1111: i++;
1112: }
1.1.1.4 root 1113:
1114: /* Attempt to free the storage associated with the local symbols
1115: that we threw away. Whether or not this has any effect on the
1116: memory allocation depends on the malloc implementation and how
1117: many symbols we managed to discard. */
1118: new_syms = realloc(syms, nsyms * sizeof(*syms));
1119: if (new_syms == NULL) {
1120: free(s);
1121: free(syms);
1122: free(strings);
1123: return;
1124: }
1125: syms = new_syms;
1.1 root 1126:
1127: qsort(syms, nsyms, sizeof(*syms), symcmp);
1128:
1129: lseek(fd, strtab.sh_offset, SEEK_SET);
1.1.1.4 root 1130: if (read(fd, strings, strtab.sh_size) != strtab.sh_size) {
1131: free(s);
1132: free(syms);
1133: free(strings);
1.1 root 1134: return;
1.1.1.4 root 1135: }
1.1 root 1136: s->disas_num_syms = nsyms;
1137: #if ELF_CLASS == ELFCLASS32
1138: s->disas_symtab.elf32 = syms;
1.1.1.3 root 1139: s->lookup_symbol = (lookup_symbol_t)lookup_symbolxx;
1.1 root 1140: #else
1141: s->disas_symtab.elf64 = syms;
1.1.1.3 root 1142: s->lookup_symbol = (lookup_symbol_t)lookup_symbolxx;
1.1 root 1143: #endif
1144: s->next = syminfos;
1145: syminfos = s;
1146: }
1147:
1148: int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
1149: struct image_info * info)
1150: {
1151: struct elfhdr elf_ex;
1152: struct elfhdr interp_elf_ex;
1153: struct exec interp_ex;
1154: int interpreter_fd = -1; /* avoid warning */
1155: abi_ulong load_addr, load_bias;
1156: int load_addr_set = 0;
1157: unsigned int interpreter_type = INTERPRETER_NONE;
1158: unsigned char ibcs2_interpreter;
1159: int i;
1160: abi_ulong mapped_addr;
1161: struct elf_phdr * elf_ppnt;
1162: struct elf_phdr *elf_phdata;
1163: abi_ulong elf_bss, k, elf_brk;
1164: int retval;
1165: char * elf_interpreter;
1166: abi_ulong elf_entry, interp_load_addr = 0;
1167: int status;
1168: abi_ulong start_code, end_code, start_data, end_data;
1169: abi_ulong reloc_func_desc = 0;
1170: abi_ulong elf_stack;
1171: char passed_fileno[6];
1172:
1173: ibcs2_interpreter = 0;
1174: status = 0;
1175: load_addr = 0;
1176: load_bias = 0;
1177: elf_ex = *((struct elfhdr *) bprm->buf); /* exec-header */
1178: #ifdef BSWAP_NEEDED
1179: bswap_ehdr(&elf_ex);
1180: #endif
1181:
1182: /* First of all, some simple consistency checks */
1183: if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) ||
1184: (! elf_check_arch(elf_ex.e_machine))) {
1185: return -ENOEXEC;
1186: }
1187:
1188: bprm->p = copy_elf_strings(1, &bprm->filename, bprm->page, bprm->p);
1189: bprm->p = copy_elf_strings(bprm->envc,bprm->envp,bprm->page,bprm->p);
1190: bprm->p = copy_elf_strings(bprm->argc,bprm->argv,bprm->page,bprm->p);
1191: if (!bprm->p) {
1192: retval = -E2BIG;
1193: }
1194:
1195: /* Now read in all of the header information */
1196: elf_phdata = (struct elf_phdr *)malloc(elf_ex.e_phentsize*elf_ex.e_phnum);
1197: if (elf_phdata == NULL) {
1198: return -ENOMEM;
1199: }
1200:
1201: retval = lseek(bprm->fd, elf_ex.e_phoff, SEEK_SET);
1202: if(retval > 0) {
1203: retval = read(bprm->fd, (char *) elf_phdata,
1204: elf_ex.e_phentsize * elf_ex.e_phnum);
1205: }
1206:
1207: if (retval < 0) {
1208: perror("load_elf_binary");
1209: exit(-1);
1210: free (elf_phdata);
1211: return -errno;
1212: }
1213:
1214: #ifdef BSWAP_NEEDED
1215: elf_ppnt = elf_phdata;
1216: for (i=0; i<elf_ex.e_phnum; i++, elf_ppnt++) {
1217: bswap_phdr(elf_ppnt);
1218: }
1219: #endif
1220: elf_ppnt = elf_phdata;
1221:
1222: elf_bss = 0;
1223: elf_brk = 0;
1224:
1225:
1226: elf_stack = ~((abi_ulong)0UL);
1227: elf_interpreter = NULL;
1228: start_code = ~((abi_ulong)0UL);
1229: end_code = 0;
1230: start_data = 0;
1231: end_data = 0;
1232: interp_ex.a_info = 0;
1233:
1234: for(i=0;i < elf_ex.e_phnum; i++) {
1235: if (elf_ppnt->p_type == PT_INTERP) {
1236: if ( elf_interpreter != NULL )
1237: {
1238: free (elf_phdata);
1239: free(elf_interpreter);
1240: close(bprm->fd);
1241: return -EINVAL;
1242: }
1243:
1244: /* This is the program interpreter used for
1245: * shared libraries - for now assume that this
1246: * is an a.out format binary
1247: */
1248:
1249: elf_interpreter = (char *)malloc(elf_ppnt->p_filesz);
1250:
1251: if (elf_interpreter == NULL) {
1252: free (elf_phdata);
1253: close(bprm->fd);
1254: return -ENOMEM;
1255: }
1256:
1257: retval = lseek(bprm->fd, elf_ppnt->p_offset, SEEK_SET);
1258: if(retval >= 0) {
1259: retval = read(bprm->fd, elf_interpreter, elf_ppnt->p_filesz);
1260: }
1261: if(retval < 0) {
1262: perror("load_elf_binary2");
1263: exit(-1);
1264: }
1265:
1266: /* If the program interpreter is one of these two,
1267: then assume an iBCS2 image. Otherwise assume
1268: a native linux image. */
1269:
1270: /* JRP - Need to add X86 lib dir stuff here... */
1271:
1272: if (strcmp(elf_interpreter,"/usr/lib/libc.so.1") == 0 ||
1273: strcmp(elf_interpreter,"/usr/lib/ld.so.1") == 0) {
1274: ibcs2_interpreter = 1;
1275: }
1276:
1277: #if 0
1.1.1.3 root 1278: printf("Using ELF interpreter %s\n", path(elf_interpreter));
1.1 root 1279: #endif
1280: if (retval >= 0) {
1281: retval = open(path(elf_interpreter), O_RDONLY);
1282: if(retval >= 0) {
1283: interpreter_fd = retval;
1284: }
1285: else {
1286: perror(elf_interpreter);
1287: exit(-1);
1288: /* retval = -errno; */
1289: }
1290: }
1291:
1292: if (retval >= 0) {
1293: retval = lseek(interpreter_fd, 0, SEEK_SET);
1294: if(retval >= 0) {
1295: retval = read(interpreter_fd,bprm->buf,128);
1296: }
1297: }
1298: if (retval >= 0) {
1299: interp_ex = *((struct exec *) bprm->buf); /* aout exec-header */
1.1.1.3 root 1300: interp_elf_ex = *((struct elfhdr *) bprm->buf); /* elf exec-header */
1.1 root 1301: }
1302: if (retval < 0) {
1303: perror("load_elf_binary3");
1304: exit(-1);
1305: free (elf_phdata);
1306: free(elf_interpreter);
1307: close(bprm->fd);
1308: return retval;
1309: }
1310: }
1311: elf_ppnt++;
1312: }
1313:
1314: /* Some simple consistency checks for the interpreter */
1315: if (elf_interpreter){
1316: interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT;
1317:
1318: /* Now figure out which format our binary is */
1319: if ((N_MAGIC(interp_ex) != OMAGIC) && (N_MAGIC(interp_ex) != ZMAGIC) &&
1320: (N_MAGIC(interp_ex) != QMAGIC)) {
1321: interpreter_type = INTERPRETER_ELF;
1322: }
1323:
1324: if (interp_elf_ex.e_ident[0] != 0x7f ||
1.1.1.2 root 1325: strncmp((char *)&interp_elf_ex.e_ident[1], "ELF",3) != 0) {
1.1 root 1326: interpreter_type &= ~INTERPRETER_ELF;
1327: }
1328:
1329: if (!interpreter_type) {
1330: free(elf_interpreter);
1331: free(elf_phdata);
1332: close(bprm->fd);
1333: return -ELIBBAD;
1334: }
1335: }
1336:
1337: /* OK, we are done with that, now set up the arg stuff,
1338: and then start this sucker up */
1339:
1340: {
1341: char * passed_p;
1342:
1343: if (interpreter_type == INTERPRETER_AOUT) {
1344: snprintf(passed_fileno, sizeof(passed_fileno), "%d", bprm->fd);
1345: passed_p = passed_fileno;
1346:
1347: if (elf_interpreter) {
1348: bprm->p = copy_elf_strings(1,&passed_p,bprm->page,bprm->p);
1349: bprm->argc++;
1350: }
1351: }
1352: if (!bprm->p) {
1353: if (elf_interpreter) {
1354: free(elf_interpreter);
1355: }
1356: free (elf_phdata);
1357: close(bprm->fd);
1358: return -E2BIG;
1359: }
1360: }
1361:
1362: /* OK, This is the point of no return */
1363: info->end_data = 0;
1364: info->end_code = 0;
1365: info->start_mmap = (abi_ulong)ELF_START_MMAP;
1366: info->mmap = 0;
1367: elf_entry = (abi_ulong) elf_ex.e_entry;
1368:
1.1.1.3 root 1369: #if defined(CONFIG_USE_GUEST_BASE)
1370: /*
1371: * In case where user has not explicitly set the guest_base, we
1372: * probe here that should we set it automatically.
1373: */
1374: if (!have_guest_base) {
1375: /*
1376: * Go through ELF program header table and find out whether
1377: * any of the segments drop below our current mmap_min_addr and
1378: * in that case set guest_base to corresponding address.
1379: */
1380: for (i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum;
1381: i++, elf_ppnt++) {
1382: if (elf_ppnt->p_type != PT_LOAD)
1383: continue;
1384: if (HOST_PAGE_ALIGN(elf_ppnt->p_vaddr) < mmap_min_addr) {
1385: guest_base = HOST_PAGE_ALIGN(mmap_min_addr);
1386: break;
1387: }
1388: }
1389: }
1390: #endif /* CONFIG_USE_GUEST_BASE */
1391:
1.1 root 1392: /* Do this so that we can load the interpreter, if need be. We will
1393: change some of these later */
1394: info->rss = 0;
1395: bprm->p = setup_arg_pages(bprm->p, bprm, info);
1396: info->start_stack = bprm->p;
1397:
1398: /* Now we do a little grungy work by mmaping the ELF image into
1399: * the correct location in memory. At this point, we assume that
1400: * the image should be loaded at fixed address, not at a variable
1401: * address.
1402: */
1403:
1404: for(i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum; i++, elf_ppnt++) {
1405: int elf_prot = 0;
1406: int elf_flags = 0;
1407: abi_ulong error;
1408:
1409: if (elf_ppnt->p_type != PT_LOAD)
1410: continue;
1411:
1412: if (elf_ppnt->p_flags & PF_R) elf_prot |= PROT_READ;
1413: if (elf_ppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
1414: if (elf_ppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
1415: elf_flags = MAP_PRIVATE | MAP_DENYWRITE;
1416: if (elf_ex.e_type == ET_EXEC || load_addr_set) {
1417: elf_flags |= MAP_FIXED;
1418: } else if (elf_ex.e_type == ET_DYN) {
1419: /* Try and get dynamic programs out of the way of the default mmap
1420: base, as well as whatever program they might try to exec. This
1421: is because the brk will follow the loader, and is not movable. */
1422: /* NOTE: for qemu, we do a big mmap to get enough space
1423: without hardcoding any address */
1424: error = target_mmap(0, ET_DYN_MAP_SIZE,
1425: PROT_NONE, MAP_PRIVATE | MAP_ANON,
1426: -1, 0);
1427: if (error == -1) {
1428: perror("mmap");
1429: exit(-1);
1430: }
1431: load_bias = TARGET_ELF_PAGESTART(error - elf_ppnt->p_vaddr);
1432: }
1433:
1434: error = target_mmap(TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr),
1435: (elf_ppnt->p_filesz +
1436: TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)),
1437: elf_prot,
1438: (MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE),
1439: bprm->fd,
1440: (elf_ppnt->p_offset -
1441: TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)));
1442: if (error == -1) {
1443: perror("mmap");
1444: exit(-1);
1445: }
1446:
1447: #ifdef LOW_ELF_STACK
1448: if (TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr) < elf_stack)
1449: elf_stack = TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr);
1450: #endif
1451:
1452: if (!load_addr_set) {
1453: load_addr_set = 1;
1454: load_addr = elf_ppnt->p_vaddr - elf_ppnt->p_offset;
1455: if (elf_ex.e_type == ET_DYN) {
1456: load_bias += error -
1457: TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr);
1458: load_addr += load_bias;
1459: reloc_func_desc = load_bias;
1460: }
1461: }
1462: k = elf_ppnt->p_vaddr;
1463: if (k < start_code)
1464: start_code = k;
1465: if (start_data < k)
1466: start_data = k;
1467: k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
1468: if (k > elf_bss)
1469: elf_bss = k;
1470: if ((elf_ppnt->p_flags & PF_X) && end_code < k)
1471: end_code = k;
1472: if (end_data < k)
1473: end_data = k;
1474: k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
1475: if (k > elf_brk) elf_brk = k;
1476: }
1477:
1478: elf_entry += load_bias;
1479: elf_bss += load_bias;
1480: elf_brk += load_bias;
1481: start_code += load_bias;
1482: end_code += load_bias;
1483: start_data += load_bias;
1484: end_data += load_bias;
1485:
1486: if (elf_interpreter) {
1487: if (interpreter_type & 1) {
1488: elf_entry = load_aout_interp(&interp_ex, interpreter_fd);
1489: }
1490: else if (interpreter_type & 2) {
1491: elf_entry = load_elf_interp(&interp_elf_ex, interpreter_fd,
1492: &interp_load_addr);
1493: }
1494: reloc_func_desc = interp_load_addr;
1495:
1496: close(interpreter_fd);
1497: free(elf_interpreter);
1498:
1499: if (elf_entry == ~((abi_ulong)0UL)) {
1500: printf("Unable to load interpreter\n");
1501: free(elf_phdata);
1502: exit(-1);
1503: return 0;
1504: }
1505: }
1506:
1507: free(elf_phdata);
1508:
1509: if (qemu_log_enabled())
1510: load_symbols(&elf_ex, bprm->fd);
1511:
1512: if (interpreter_type != INTERPRETER_AOUT) close(bprm->fd);
1513: info->personality = (ibcs2_interpreter ? PER_SVR4 : PER_LINUX);
1514:
1515: #ifdef LOW_ELF_STACK
1516: info->start_stack = bprm->p = elf_stack - 4;
1517: #endif
1518: bprm->p = create_elf_tables(bprm->p,
1519: bprm->argc,
1520: bprm->envc,
1521: &elf_ex,
1522: load_addr, load_bias,
1523: interp_load_addr,
1524: (interpreter_type == INTERPRETER_AOUT ? 0 : 1),
1525: info);
1526: info->load_addr = reloc_func_desc;
1527: info->start_brk = info->brk = elf_brk;
1528: info->end_code = end_code;
1529: info->start_code = start_code;
1530: info->start_data = start_data;
1531: info->end_data = end_data;
1532: info->start_stack = bprm->p;
1533:
1534: /* Calling set_brk effectively mmaps the pages that we need for the bss and break
1535: sections */
1536: set_brk(elf_bss, elf_brk);
1537:
1538: padzero(elf_bss, elf_brk);
1539:
1540: #if 0
1541: printf("(start_brk) %x\n" , info->start_brk);
1542: printf("(end_code) %x\n" , info->end_code);
1543: printf("(start_code) %x\n" , info->start_code);
1544: printf("(end_data) %x\n" , info->end_data);
1545: printf("(start_stack) %x\n" , info->start_stack);
1546: printf("(brk) %x\n" , info->brk);
1547: #endif
1548:
1549: if ( info->personality == PER_SVR4 )
1550: {
1551: /* Why this, you ask??? Well SVr4 maps page 0 as read-only,
1552: and some applications "depend" upon this behavior.
1553: Since we do not have the power to recompile these, we
1554: emulate the SVr4 behavior. Sigh. */
1555: mapped_addr = target_mmap(0, qemu_host_page_size, PROT_READ | PROT_EXEC,
1556: MAP_FIXED | MAP_PRIVATE, -1, 0);
1557: }
1558:
1559: info->entry = elf_entry;
1560:
1561: return 0;
1562: }
1563:
1564: static int load_aout_interp(void * exptr, int interp_fd)
1565: {
1566: printf("a.out interpreter not yet supported\n");
1567: return(0);
1568: }
1569:
1570: void do_init_thread(struct target_pt_regs *regs, struct image_info *infop)
1571: {
1572: init_thread(regs, infop);
1573: }
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