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