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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 <sys/stat.h>
7: #include <errno.h>
8: #include <unistd.h>
9: #include <sys/mman.h>
10: #include <stdlib.h>
11: #include <string.h>
12:
13: #include "qemu.h"
14: #include "disas.h"
15:
16: /* this flag is uneffective under linux too, should be deleted */
17: #ifndef MAP_DENYWRITE
18: #define MAP_DENYWRITE 0
19: #endif
20:
21: /* should probably go in elf.h */
22: #ifndef ELIBBAD
23: #define ELIBBAD 80
24: #endif
25:
26: #ifdef TARGET_I386
27:
1.1.1.2 ! root 28: #define ELF_PLATFORM get_elf_platform()
! 29:
! 30: static const char *get_elf_platform(void)
! 31: {
! 32: static char elf_platform[] = "i386";
! 33: int family = (global_env->cpuid_version >> 8) & 0xff;
! 34: if (family > 6)
! 35: family = 6;
! 36: if (family >= 3)
! 37: elf_platform[1] = '0' + family;
! 38: return elf_platform;
! 39: }
! 40:
! 41: #define ELF_HWCAP get_elf_hwcap()
! 42:
! 43: static uint32_t get_elf_hwcap(void)
! 44: {
! 45: return global_env->cpuid_features;
! 46: }
! 47:
1.1 root 48: #define ELF_START_MMAP 0x80000000
49:
50: /*
51: * This is used to ensure we don't load something for the wrong architecture.
52: */
53: #define elf_check_arch(x) ( ((x) == EM_386) || ((x) == EM_486) )
54:
55: /*
56: * These are used to set parameters in the core dumps.
57: */
58: #define ELF_CLASS ELFCLASS32
59: #define ELF_DATA ELFDATA2LSB
60: #define ELF_ARCH EM_386
61:
62: /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program
63: starts %edx contains a pointer to a function which might be
64: registered using `atexit'. This provides a mean for the
65: dynamic linker to call DT_FINI functions for shared libraries
66: that have been loaded before the code runs.
67:
68: A value of 0 tells we have no such handler. */
69: #define ELF_PLAT_INIT(_r) _r->edx = 0
70:
71: static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
72: {
73: regs->esp = infop->start_stack;
74: regs->eip = infop->entry;
75: }
76:
77: #define USE_ELF_CORE_DUMP
78: #define ELF_EXEC_PAGESIZE 4096
79:
80: #endif
81:
82: #ifdef TARGET_ARM
83:
84: #define ELF_START_MMAP 0x80000000
85:
86: #define elf_check_arch(x) ( (x) == EM_ARM )
87:
88: #define ELF_CLASS ELFCLASS32
89: #ifdef TARGET_WORDS_BIGENDIAN
90: #define ELF_DATA ELFDATA2MSB
91: #else
92: #define ELF_DATA ELFDATA2LSB
93: #endif
94: #define ELF_ARCH EM_ARM
95:
96: #define ELF_PLAT_INIT(_r) _r->ARM_r0 = 0
97:
98: static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
99: {
100: target_long *stack = (void *)infop->start_stack;
101: memset(regs, 0, sizeof(*regs));
102: regs->ARM_cpsr = 0x10;
103: regs->ARM_pc = infop->entry;
104: regs->ARM_sp = infop->start_stack;
105: regs->ARM_r2 = tswapl(stack[2]); /* envp */
106: regs->ARM_r1 = tswapl(stack[1]); /* argv */
107: /* XXX: it seems that r0 is zeroed after ! */
108: // regs->ARM_r0 = tswapl(stack[0]); /* argc */
109: }
110:
111: #define USE_ELF_CORE_DUMP
112: #define ELF_EXEC_PAGESIZE 4096
113:
1.1.1.2 ! root 114: enum
! 115: {
! 116: ARM_HWCAP_ARM_SWP = 1 << 0,
! 117: ARM_HWCAP_ARM_HALF = 1 << 1,
! 118: ARM_HWCAP_ARM_THUMB = 1 << 2,
! 119: ARM_HWCAP_ARM_26BIT = 1 << 3,
! 120: ARM_HWCAP_ARM_FAST_MULT = 1 << 4,
! 121: ARM_HWCAP_ARM_FPA = 1 << 5,
! 122: ARM_HWCAP_ARM_VFP = 1 << 6,
! 123: ARM_HWCAP_ARM_EDSP = 1 << 7,
! 124: };
! 125:
! 126: #define ELF_HWCAP (ARM_HWCAP_ARM_SWP | ARM_HWCAP_ARM_HALF \
! 127: | ARM_HWCAP_ARM_THUMB | ARM_HWCAP_ARM_FAST_MULT \
! 128: | ARM_HWCAP_ARM_FPA | ARM_HWCAP_ARM_VFP)
! 129:
1.1 root 130: #endif
131:
132: #ifdef TARGET_SPARC
133: #ifdef TARGET_SPARC64
134:
135: #define ELF_START_MMAP 0x80000000
136:
137: #define elf_check_arch(x) ( (x) == EM_SPARC )
138:
139: #define ELF_CLASS ELFCLASS64
140: #define ELF_DATA ELFDATA2MSB
141: #define ELF_ARCH EM_SPARC
142:
143: /*XXX*/
144: #define ELF_PLAT_INIT(_r)
145:
146: static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
147: {
148: regs->tstate = 0;
149: regs->pc = infop->entry;
150: regs->npc = regs->pc + 4;
151: regs->y = 0;
152: regs->u_regs[14] = infop->start_stack - 16 * 4;
153: }
154:
155: #else
156: #define ELF_START_MMAP 0x80000000
157:
158: #define elf_check_arch(x) ( (x) == EM_SPARC )
159:
160: #define ELF_CLASS ELFCLASS32
161: #define ELF_DATA ELFDATA2MSB
162: #define ELF_ARCH EM_SPARC
163:
164: /*XXX*/
165: #define ELF_PLAT_INIT(_r)
166:
167: static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
168: {
169: regs->psr = 0;
170: regs->pc = infop->entry;
171: regs->npc = regs->pc + 4;
172: regs->y = 0;
173: regs->u_regs[14] = infop->start_stack - 16 * 4;
174: }
175:
176: #endif
177: #endif
178:
179: #ifdef TARGET_PPC
180:
181: #define ELF_START_MMAP 0x80000000
182:
183: #define elf_check_arch(x) ( (x) == EM_PPC )
184:
185: #define ELF_CLASS ELFCLASS32
186: #ifdef TARGET_WORDS_BIGENDIAN
187: #define ELF_DATA ELFDATA2MSB
188: #else
189: #define ELF_DATA ELFDATA2LSB
190: #endif
191: #define ELF_ARCH EM_PPC
192:
193: /* Note that isn't exactly what regular kernel does
194: * but this is what the ABI wants and is needed to allow
195: * execution of PPC BSD programs.
196: */
197: #define ELF_PLAT_INIT(_r) \
198: do { \
199: target_ulong *pos = (target_ulong *)bprm->p, tmp = 1; \
200: _r->gpr[3] = bprm->argc; \
201: _r->gpr[4] = (unsigned long)++pos; \
202: for (; tmp != 0; pos++) \
203: tmp = *pos; \
204: _r->gpr[5] = (unsigned long)pos; \
205: } while (0)
206:
207: /*
208: * We need to put in some extra aux table entries to tell glibc what
209: * the cache block size is, so it can use the dcbz instruction safely.
210: */
211: #define AT_DCACHEBSIZE 19
212: #define AT_ICACHEBSIZE 20
213: #define AT_UCACHEBSIZE 21
214: /* A special ignored type value for PPC, for glibc compatibility. */
215: #define AT_IGNOREPPC 22
216: /*
217: * The requirements here are:
218: * - keep the final alignment of sp (sp & 0xf)
219: * - make sure the 32-bit value at the first 16 byte aligned position of
220: * AUXV is greater than 16 for glibc compatibility.
221: * AT_IGNOREPPC is used for that.
222: * - for compatibility with glibc ARCH_DLINFO must always be defined on PPC,
223: * even if DLINFO_ARCH_ITEMS goes to zero or is undefined.
224: */
225: #define DLINFO_ARCH_ITEMS 5
226: #define ARCH_DLINFO \
227: do { \
228: NEW_AUX_ENT(AT_DCACHEBSIZE, 0x20); \
229: NEW_AUX_ENT(AT_ICACHEBSIZE, 0x20); \
230: NEW_AUX_ENT(AT_UCACHEBSIZE, 0); \
231: /* \
232: * Now handle glibc compatibility. \
233: */ \
234: NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \
235: NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \
236: } while (0)
237:
238: static inline void init_thread(struct target_pt_regs *_regs, struct image_info *infop)
239: {
240: _regs->msr = 1 << MSR_PR; /* Set user mode */
241: _regs->gpr[1] = infop->start_stack;
242: _regs->nip = infop->entry;
243: }
244:
245: #define USE_ELF_CORE_DUMP
246: #define ELF_EXEC_PAGESIZE 4096
247:
248: #endif
249:
1.1.1.2 ! root 250: #ifdef TARGET_MIPS
! 251:
! 252: #define ELF_START_MMAP 0x80000000
! 253:
! 254: #define elf_check_arch(x) ( (x) == EM_MIPS )
! 255:
! 256: #define ELF_CLASS ELFCLASS32
! 257: #ifdef TARGET_WORDS_BIGENDIAN
! 258: #define ELF_DATA ELFDATA2MSB
! 259: #else
! 260: #define ELF_DATA ELFDATA2LSB
! 261: #endif
! 262: #define ELF_ARCH EM_MIPS
! 263:
! 264: #define ELF_PLAT_INIT(_r)
! 265:
! 266: static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
! 267: {
! 268: regs->cp0_status = CP0St_UM;
! 269: regs->cp0_epc = infop->entry;
! 270: regs->regs[29] = infop->start_stack;
! 271: }
! 272:
! 273: #endif /* TARGET_MIPS */
! 274:
! 275: #ifndef ELF_PLATFORM
! 276: #define ELF_PLATFORM (NULL)
! 277: #endif
! 278:
! 279: #ifndef ELF_HWCAP
! 280: #define ELF_HWCAP 0
! 281: #endif
! 282:
1.1 root 283: #include "elf.h"
284:
285: /*
286: * MAX_ARG_PAGES defines the number of pages allocated for arguments
287: * and envelope for the new program. 32 should suffice, this gives
288: * a maximum env+arg of 128kB w/4KB pages!
289: */
290: #define MAX_ARG_PAGES 32
291:
292: /*
293: * This structure is used to hold the arguments that are
294: * used when loading binaries.
295: */
296: struct linux_binprm {
297: char buf[128];
298: unsigned long page[MAX_ARG_PAGES];
299: unsigned long p;
300: int sh_bang;
301: int fd;
302: int e_uid, e_gid;
303: int argc, envc;
304: char * filename; /* Name of binary */
305: unsigned long loader, exec;
306: int dont_iput; /* binfmt handler has put inode */
307: };
308:
309: struct exec
310: {
311: unsigned int a_info; /* Use macros N_MAGIC, etc for access */
312: unsigned int a_text; /* length of text, in bytes */
313: unsigned int a_data; /* length of data, in bytes */
314: unsigned int a_bss; /* length of uninitialized data area, in bytes */
315: unsigned int a_syms; /* length of symbol table data in file, in bytes */
316: unsigned int a_entry; /* start address */
317: unsigned int a_trsize; /* length of relocation info for text, in bytes */
318: unsigned int a_drsize; /* length of relocation info for data, in bytes */
319: };
320:
321:
322: #define N_MAGIC(exec) ((exec).a_info & 0xffff)
323: #define OMAGIC 0407
324: #define NMAGIC 0410
325: #define ZMAGIC 0413
326: #define QMAGIC 0314
327:
328: /* max code+data+bss space allocated to elf interpreter */
329: #define INTERP_MAP_SIZE (32 * 1024 * 1024)
330:
331: /* max code+data+bss+brk space allocated to ET_DYN executables */
332: #define ET_DYN_MAP_SIZE (128 * 1024 * 1024)
333:
334: /* from personality.h */
335:
336: /* Flags for bug emulation. These occupy the top three bytes. */
337: #define STICKY_TIMEOUTS 0x4000000
338: #define WHOLE_SECONDS 0x2000000
339:
340: /* Personality types. These go in the low byte. Avoid using the top bit,
341: * it will conflict with error returns.
342: */
343: #define PER_MASK (0x00ff)
344: #define PER_LINUX (0x0000)
345: #define PER_SVR4 (0x0001 | STICKY_TIMEOUTS)
346: #define PER_SVR3 (0x0002 | STICKY_TIMEOUTS)
347: #define PER_SCOSVR3 (0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS)
348: #define PER_WYSEV386 (0x0004 | STICKY_TIMEOUTS)
349: #define PER_ISCR4 (0x0005 | STICKY_TIMEOUTS)
350: #define PER_BSD (0x0006)
351: #define PER_XENIX (0x0007 | STICKY_TIMEOUTS)
352:
353: /* Necessary parameters */
354: #define NGROUPS 32
355:
356: #define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE
357: #define TARGET_ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE-1))
358: #define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE-1))
359:
360: #define INTERPRETER_NONE 0
361: #define INTERPRETER_AOUT 1
362: #define INTERPRETER_ELF 2
363:
1.1.1.2 ! root 364: #define DLINFO_ITEMS 12
1.1 root 365:
366: static inline void memcpy_fromfs(void * to, const void * from, unsigned long n)
367: {
368: memcpy(to, from, n);
369: }
370:
371: extern unsigned long x86_stack_size;
372:
373: static int load_aout_interp(void * exptr, int interp_fd);
374:
375: #ifdef BSWAP_NEEDED
376: static void bswap_ehdr(struct elfhdr *ehdr)
377: {
378: bswap16s(&ehdr->e_type); /* Object file type */
379: bswap16s(&ehdr->e_machine); /* Architecture */
380: bswap32s(&ehdr->e_version); /* Object file version */
381: bswaptls(&ehdr->e_entry); /* Entry point virtual address */
382: bswaptls(&ehdr->e_phoff); /* Program header table file offset */
383: bswaptls(&ehdr->e_shoff); /* Section header table file offset */
384: bswap32s(&ehdr->e_flags); /* Processor-specific flags */
385: bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */
386: bswap16s(&ehdr->e_phentsize); /* Program header table entry size */
387: bswap16s(&ehdr->e_phnum); /* Program header table entry count */
388: bswap16s(&ehdr->e_shentsize); /* Section header table entry size */
389: bswap16s(&ehdr->e_shnum); /* Section header table entry count */
390: bswap16s(&ehdr->e_shstrndx); /* Section header string table index */
391: }
392:
393: static void bswap_phdr(struct elf_phdr *phdr)
394: {
395: bswap32s(&phdr->p_type); /* Segment type */
396: bswaptls(&phdr->p_offset); /* Segment file offset */
397: bswaptls(&phdr->p_vaddr); /* Segment virtual address */
398: bswaptls(&phdr->p_paddr); /* Segment physical address */
399: bswaptls(&phdr->p_filesz); /* Segment size in file */
400: bswaptls(&phdr->p_memsz); /* Segment size in memory */
401: bswap32s(&phdr->p_flags); /* Segment flags */
402: bswaptls(&phdr->p_align); /* Segment alignment */
403: }
404:
405: static void bswap_shdr(struct elf_shdr *shdr)
406: {
407: bswap32s(&shdr->sh_name);
408: bswap32s(&shdr->sh_type);
409: bswaptls(&shdr->sh_flags);
410: bswaptls(&shdr->sh_addr);
411: bswaptls(&shdr->sh_offset);
412: bswaptls(&shdr->sh_size);
413: bswap32s(&shdr->sh_link);
414: bswap32s(&shdr->sh_info);
415: bswaptls(&shdr->sh_addralign);
416: bswaptls(&shdr->sh_entsize);
417: }
418:
419: static void bswap_sym(Elf32_Sym *sym)
420: {
421: bswap32s(&sym->st_name);
422: bswap32s(&sym->st_value);
423: bswap32s(&sym->st_size);
424: bswap16s(&sym->st_shndx);
425: }
426: #endif
427:
428: static void * get_free_page(void)
429: {
430: void * retval;
431:
432: /* User-space version of kernel get_free_page. Returns a page-aligned
433: * page-sized chunk of memory.
434: */
435: retval = (void *)target_mmap(0, qemu_host_page_size, PROT_READ|PROT_WRITE,
436: MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
437:
438: if((long)retval == -1) {
439: perror("get_free_page");
440: exit(-1);
441: }
442: else {
443: return(retval);
444: }
445: }
446:
447: static void free_page(void * pageaddr)
448: {
449: target_munmap((unsigned long)pageaddr, qemu_host_page_size);
450: }
451:
452: /*
453: * 'copy_string()' copies argument/envelope strings from user
454: * memory to free pages in kernel mem. These are in a format ready
455: * to be put directly into the top of new user memory.
456: *
457: */
458: static unsigned long copy_strings(int argc,char ** argv,unsigned long *page,
459: unsigned long p)
460: {
461: char *tmp, *tmp1, *pag = NULL;
462: int len, offset = 0;
463:
464: if (!p) {
465: return 0; /* bullet-proofing */
466: }
467: while (argc-- > 0) {
468: tmp = argv[argc];
469: if (!tmp) {
470: fprintf(stderr, "VFS: argc is wrong");
471: exit(-1);
472: }
473: tmp1 = tmp;
474: while (*tmp++);
475: len = tmp - tmp1;
476: if (p < len) { /* this shouldn't happen - 128kB */
477: return 0;
478: }
479: while (len) {
480: --p; --tmp; --len;
481: if (--offset < 0) {
482: offset = p % TARGET_PAGE_SIZE;
483: pag = (char *) page[p/TARGET_PAGE_SIZE];
484: if (!pag) {
485: pag = (char *)get_free_page();
486: page[p/TARGET_PAGE_SIZE] = (unsigned long)pag;
487: if (!pag)
488: return 0;
489: }
490: }
491: if (len == 0 || offset == 0) {
492: *(pag + offset) = *tmp;
493: }
494: else {
495: int bytes_to_copy = (len > offset) ? offset : len;
496: tmp -= bytes_to_copy;
497: p -= bytes_to_copy;
498: offset -= bytes_to_copy;
499: len -= bytes_to_copy;
500: memcpy_fromfs(pag + offset, tmp, bytes_to_copy + 1);
501: }
502: }
503: }
504: return p;
505: }
506:
507: static int in_group_p(gid_t g)
508: {
509: /* return TRUE if we're in the specified group, FALSE otherwise */
510: int ngroup;
511: int i;
512: gid_t grouplist[NGROUPS];
513:
514: ngroup = getgroups(NGROUPS, grouplist);
515: for(i = 0; i < ngroup; i++) {
516: if(grouplist[i] == g) {
517: return 1;
518: }
519: }
520: return 0;
521: }
522:
523: static int count(char ** vec)
524: {
525: int i;
526:
527: for(i = 0; *vec; i++) {
528: vec++;
529: }
530:
531: return(i);
532: }
533:
534: static int prepare_binprm(struct linux_binprm *bprm)
535: {
536: struct stat st;
537: int mode;
538: int retval, id_change;
539:
540: if(fstat(bprm->fd, &st) < 0) {
541: return(-errno);
542: }
543:
544: mode = st.st_mode;
545: if(!S_ISREG(mode)) { /* Must be regular file */
546: return(-EACCES);
547: }
548: if(!(mode & 0111)) { /* Must have at least one execute bit set */
549: return(-EACCES);
550: }
551:
552: bprm->e_uid = geteuid();
553: bprm->e_gid = getegid();
554: id_change = 0;
555:
556: /* Set-uid? */
557: if(mode & S_ISUID) {
558: bprm->e_uid = st.st_uid;
559: if(bprm->e_uid != geteuid()) {
560: id_change = 1;
561: }
562: }
563:
564: /* Set-gid? */
565: /*
566: * If setgid is set but no group execute bit then this
567: * is a candidate for mandatory locking, not a setgid
568: * executable.
569: */
570: if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
571: bprm->e_gid = st.st_gid;
572: if (!in_group_p(bprm->e_gid)) {
573: id_change = 1;
574: }
575: }
576:
577: memset(bprm->buf, 0, sizeof(bprm->buf));
578: retval = lseek(bprm->fd, 0L, SEEK_SET);
579: if(retval >= 0) {
580: retval = read(bprm->fd, bprm->buf, 128);
581: }
582: if(retval < 0) {
583: perror("prepare_binprm");
584: exit(-1);
585: /* return(-errno); */
586: }
587: else {
588: return(retval);
589: }
590: }
591:
592: unsigned long setup_arg_pages(unsigned long p, struct linux_binprm * bprm,
593: struct image_info * info)
594: {
595: unsigned long stack_base, size, error;
596: int i;
597:
598: /* Create enough stack to hold everything. If we don't use
599: * it for args, we'll use it for something else...
600: */
601: size = x86_stack_size;
602: if (size < MAX_ARG_PAGES*TARGET_PAGE_SIZE)
603: size = MAX_ARG_PAGES*TARGET_PAGE_SIZE;
604: error = target_mmap(0,
605: size + qemu_host_page_size,
606: PROT_READ | PROT_WRITE,
607: MAP_PRIVATE | MAP_ANONYMOUS,
608: -1, 0);
609: if (error == -1) {
610: perror("stk mmap");
611: exit(-1);
612: }
613: /* we reserve one extra page at the top of the stack as guard */
614: target_mprotect(error + size, qemu_host_page_size, PROT_NONE);
615:
616: stack_base = error + size - MAX_ARG_PAGES*TARGET_PAGE_SIZE;
617: p += stack_base;
618:
619: if (bprm->loader) {
620: bprm->loader += stack_base;
621: }
622: bprm->exec += stack_base;
623:
624: for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
625: if (bprm->page[i]) {
626: info->rss++;
627:
628: memcpy((void *)stack_base, (void *)bprm->page[i], TARGET_PAGE_SIZE);
629: free_page((void *)bprm->page[i]);
630: }
631: stack_base += TARGET_PAGE_SIZE;
632: }
633: return p;
634: }
635:
636: static void set_brk(unsigned long start, unsigned long end)
637: {
638: /* page-align the start and end addresses... */
639: start = HOST_PAGE_ALIGN(start);
640: end = HOST_PAGE_ALIGN(end);
641: if (end <= start)
642: return;
643: if(target_mmap(start, end - start,
644: PROT_READ | PROT_WRITE | PROT_EXEC,
645: MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0) == -1) {
646: perror("cannot mmap brk");
647: exit(-1);
648: }
649: }
650:
651:
652: /* We need to explicitly zero any fractional pages after the data
653: section (i.e. bss). This would contain the junk from the file that
654: should not be in memory. */
655: static void padzero(unsigned long elf_bss)
656: {
657: unsigned long nbyte;
658: char * fpnt;
659:
660: /* XXX: this is really a hack : if the real host page size is
661: smaller than the target page size, some pages after the end
662: of the file may not be mapped. A better fix would be to
663: patch target_mmap(), but it is more complicated as the file
664: size must be known */
665: if (qemu_real_host_page_size < qemu_host_page_size) {
666: unsigned long end_addr, end_addr1;
667: end_addr1 = (elf_bss + qemu_real_host_page_size - 1) &
668: ~(qemu_real_host_page_size - 1);
669: end_addr = HOST_PAGE_ALIGN(elf_bss);
670: if (end_addr1 < end_addr) {
671: mmap((void *)end_addr1, end_addr - end_addr1,
672: PROT_READ|PROT_WRITE|PROT_EXEC,
673: MAP_FIXED|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
674: }
675: }
676:
677: nbyte = elf_bss & (qemu_host_page_size-1);
678: if (nbyte) {
679: nbyte = qemu_host_page_size - nbyte;
680: fpnt = (char *) elf_bss;
681: do {
682: *fpnt++ = 0;
683: } while (--nbyte);
684: }
685: }
686:
687: static unsigned int * create_elf_tables(char *p, int argc, int envc,
688: struct elfhdr * exec,
689: unsigned long load_addr,
690: unsigned long load_bias,
691: unsigned long interp_load_addr, int ibcs,
692: struct image_info *info)
693: {
694: target_ulong *argv, *envp;
695: target_ulong *sp, *csp;
1.1.1.2 ! root 696: target_ulong *u_platform;
! 697: const char *k_platform;
1.1 root 698: int v;
699:
700: /*
701: * Force 16 byte _final_ alignment here for generality.
702: */
703: sp = (unsigned int *) (~15UL & (unsigned long) p);
1.1.1.2 ! root 704: u_platform = NULL;
! 705: k_platform = ELF_PLATFORM;
! 706: if (k_platform) {
! 707: size_t len = strlen(k_platform) + 1;
! 708: sp -= (len + sizeof(target_ulong) - 1) / sizeof(target_ulong);
! 709: u_platform = (target_ulong *)sp;
! 710: __copy_to_user(u_platform, k_platform, len);
! 711: }
1.1 root 712: csp = sp;
713: csp -= (DLINFO_ITEMS + 1) * 2;
1.1.1.2 ! root 714: if (k_platform)
! 715: csp -= 2;
1.1 root 716: #ifdef DLINFO_ARCH_ITEMS
717: csp -= DLINFO_ARCH_ITEMS*2;
718: #endif
719: csp -= envc+1;
720: csp -= argc+1;
721: csp -= (!ibcs ? 3 : 1); /* argc itself */
722: if ((unsigned long)csp & 15UL)
723: sp -= ((unsigned long)csp & 15UL) / sizeof(*sp);
724:
725: #define NEW_AUX_ENT(id, val) \
726: sp -= 2; \
727: put_user (id, sp); \
728: put_user (val, sp + 1)
729: NEW_AUX_ENT (AT_NULL, 0);
730:
731: /* There must be exactly DLINFO_ITEMS entries here. */
732: NEW_AUX_ENT(AT_PHDR, (target_ulong)(load_addr + exec->e_phoff));
733: NEW_AUX_ENT(AT_PHENT, (target_ulong)(sizeof (struct elf_phdr)));
734: NEW_AUX_ENT(AT_PHNUM, (target_ulong)(exec->e_phnum));
735: NEW_AUX_ENT(AT_PAGESZ, (target_ulong)(TARGET_PAGE_SIZE));
736: NEW_AUX_ENT(AT_BASE, (target_ulong)(interp_load_addr));
737: NEW_AUX_ENT(AT_FLAGS, (target_ulong)0);
738: NEW_AUX_ENT(AT_ENTRY, load_bias + exec->e_entry);
739: NEW_AUX_ENT(AT_UID, (target_ulong) getuid());
740: NEW_AUX_ENT(AT_EUID, (target_ulong) geteuid());
741: NEW_AUX_ENT(AT_GID, (target_ulong) getgid());
742: NEW_AUX_ENT(AT_EGID, (target_ulong) getegid());
1.1.1.2 ! root 743: NEW_AUX_ENT(AT_HWCAP, (target_ulong) ELF_HWCAP);
! 744: if (k_platform)
! 745: NEW_AUX_ENT(AT_PLATFORM, (target_ulong) u_platform);
1.1 root 746: #ifdef ARCH_DLINFO
747: /*
748: * ARCH_DLINFO must come last so platform specific code can enforce
749: * special alignment requirements on the AUXV if necessary (eg. PPC).
750: */
751: ARCH_DLINFO;
752: #endif
753: #undef NEW_AUX_ENT
754:
755: sp -= envc+1;
756: envp = sp;
757: sp -= argc+1;
758: argv = sp;
759: if (!ibcs) {
760: put_user((target_ulong)envp,--sp);
761: put_user((target_ulong)argv,--sp);
762: }
763: put_user(argc,--sp);
764: info->arg_start = (unsigned int)((unsigned long)p & 0xffffffff);
765: while (argc-->0) {
766: put_user((target_ulong)p,argv++);
767: do {
768: get_user(v, p);
769: p++;
770: } while (v != 0);
771: }
772: put_user(0,argv);
773: info->arg_end = info->env_start = (unsigned int)((unsigned long)p & 0xffffffff);
774: while (envc-->0) {
775: put_user((target_ulong)p,envp++);
776: do {
777: get_user(v, p);
778: p++;
779: } while (v != 0);
780: }
781: put_user(0,envp);
782: info->env_end = (unsigned int)((unsigned long)p & 0xffffffff);
783: return sp;
784: }
785:
786:
787:
788: static unsigned long load_elf_interp(struct elfhdr * interp_elf_ex,
789: int interpreter_fd,
790: unsigned long *interp_load_addr)
791: {
792: struct elf_phdr *elf_phdata = NULL;
793: struct elf_phdr *eppnt;
794: unsigned long load_addr = 0;
795: int load_addr_set = 0;
796: int retval;
797: unsigned long last_bss, elf_bss;
798: unsigned long error;
799: int i;
800:
801: elf_bss = 0;
802: last_bss = 0;
803: error = 0;
804:
805: #ifdef BSWAP_NEEDED
806: bswap_ehdr(interp_elf_ex);
807: #endif
808: /* First of all, some simple consistency checks */
809: if ((interp_elf_ex->e_type != ET_EXEC &&
810: interp_elf_ex->e_type != ET_DYN) ||
811: !elf_check_arch(interp_elf_ex->e_machine)) {
812: return ~0UL;
813: }
814:
815:
816: /* Now read in all of the header information */
817:
818: if (sizeof(struct elf_phdr) * interp_elf_ex->e_phnum > TARGET_PAGE_SIZE)
819: return ~0UL;
820:
821: elf_phdata = (struct elf_phdr *)
822: malloc(sizeof(struct elf_phdr) * interp_elf_ex->e_phnum);
823:
824: if (!elf_phdata)
825: return ~0UL;
826:
827: /*
828: * If the size of this structure has changed, then punt, since
829: * we will be doing the wrong thing.
830: */
831: if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr)) {
832: free(elf_phdata);
833: return ~0UL;
834: }
835:
836: retval = lseek(interpreter_fd, interp_elf_ex->e_phoff, SEEK_SET);
837: if(retval >= 0) {
838: retval = read(interpreter_fd,
839: (char *) elf_phdata,
840: sizeof(struct elf_phdr) * interp_elf_ex->e_phnum);
841: }
842: if (retval < 0) {
843: perror("load_elf_interp");
844: exit(-1);
845: free (elf_phdata);
846: return retval;
847: }
848: #ifdef BSWAP_NEEDED
849: eppnt = elf_phdata;
850: for (i=0; i<interp_elf_ex->e_phnum; i++, eppnt++) {
851: bswap_phdr(eppnt);
852: }
853: #endif
854:
855: if (interp_elf_ex->e_type == ET_DYN) {
856: /* in order to avoid harcoding the interpreter load
857: address in qemu, we allocate a big enough memory zone */
858: error = target_mmap(0, INTERP_MAP_SIZE,
859: PROT_NONE, MAP_PRIVATE | MAP_ANON,
860: -1, 0);
861: if (error == -1) {
862: perror("mmap");
863: exit(-1);
864: }
865: load_addr = error;
866: load_addr_set = 1;
867: }
868:
869: eppnt = elf_phdata;
870: for(i=0; i<interp_elf_ex->e_phnum; i++, eppnt++)
871: if (eppnt->p_type == PT_LOAD) {
872: int elf_type = MAP_PRIVATE | MAP_DENYWRITE;
873: int elf_prot = 0;
874: unsigned long vaddr = 0;
875: unsigned long k;
876:
877: if (eppnt->p_flags & PF_R) elf_prot = PROT_READ;
878: if (eppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
879: if (eppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
880: if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) {
881: elf_type |= MAP_FIXED;
882: vaddr = eppnt->p_vaddr;
883: }
884: error = target_mmap(load_addr+TARGET_ELF_PAGESTART(vaddr),
885: eppnt->p_filesz + TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr),
886: elf_prot,
887: elf_type,
888: interpreter_fd,
889: eppnt->p_offset - TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr));
890:
891: if (error > -1024UL) {
892: /* Real error */
893: close(interpreter_fd);
894: free(elf_phdata);
895: return ~0UL;
896: }
897:
898: if (!load_addr_set && interp_elf_ex->e_type == ET_DYN) {
899: load_addr = error;
900: load_addr_set = 1;
901: }
902:
903: /*
904: * Find the end of the file mapping for this phdr, and keep
905: * track of the largest address we see for this.
906: */
907: k = load_addr + eppnt->p_vaddr + eppnt->p_filesz;
908: if (k > elf_bss) elf_bss = k;
909:
910: /*
911: * Do the same thing for the memory mapping - between
912: * elf_bss and last_bss is the bss section.
913: */
914: k = load_addr + eppnt->p_memsz + eppnt->p_vaddr;
915: if (k > last_bss) last_bss = k;
916: }
917:
918: /* Now use mmap to map the library into memory. */
919:
920: close(interpreter_fd);
921:
922: /*
923: * Now fill out the bss section. First pad the last page up
924: * to the page boundary, and then perform a mmap to make sure
925: * that there are zeromapped pages up to and including the last
926: * bss page.
927: */
928: padzero(elf_bss);
929: elf_bss = TARGET_ELF_PAGESTART(elf_bss + qemu_host_page_size - 1); /* What we have mapped so far */
930:
931: /* Map the last of the bss segment */
932: if (last_bss > elf_bss) {
933: target_mmap(elf_bss, last_bss-elf_bss,
934: PROT_READ|PROT_WRITE|PROT_EXEC,
935: MAP_FIXED|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
936: }
937: free(elf_phdata);
938:
939: *interp_load_addr = load_addr;
940: return ((unsigned long) interp_elf_ex->e_entry) + load_addr;
941: }
942:
943: /* Best attempt to load symbols from this ELF object. */
944: static void load_symbols(struct elfhdr *hdr, int fd)
945: {
946: unsigned int i;
947: struct elf_shdr sechdr, symtab, strtab;
948: char *strings;
949: struct syminfo *s;
950:
951: lseek(fd, hdr->e_shoff, SEEK_SET);
952: for (i = 0; i < hdr->e_shnum; i++) {
953: if (read(fd, &sechdr, sizeof(sechdr)) != sizeof(sechdr))
954: return;
955: #ifdef BSWAP_NEEDED
956: bswap_shdr(&sechdr);
957: #endif
958: if (sechdr.sh_type == SHT_SYMTAB) {
959: symtab = sechdr;
960: lseek(fd, hdr->e_shoff
961: + sizeof(sechdr) * sechdr.sh_link, SEEK_SET);
962: if (read(fd, &strtab, sizeof(strtab))
963: != sizeof(strtab))
964: return;
965: #ifdef BSWAP_NEEDED
966: bswap_shdr(&strtab);
967: #endif
968: goto found;
969: }
970: }
971: return; /* Shouldn't happen... */
972:
973: found:
974: /* Now know where the strtab and symtab are. Snarf them. */
975: s = malloc(sizeof(*s));
976: s->disas_symtab = malloc(symtab.sh_size);
977: s->disas_strtab = strings = malloc(strtab.sh_size);
978: if (!s->disas_symtab || !s->disas_strtab)
979: return;
980:
981: lseek(fd, symtab.sh_offset, SEEK_SET);
982: if (read(fd, s->disas_symtab, symtab.sh_size) != symtab.sh_size)
983: return;
984:
985: #ifdef BSWAP_NEEDED
986: for (i = 0; i < symtab.sh_size / sizeof(struct elf_sym); i++)
987: bswap_sym(s->disas_symtab + sizeof(struct elf_sym)*i);
988: #endif
989:
990: lseek(fd, strtab.sh_offset, SEEK_SET);
991: if (read(fd, strings, strtab.sh_size) != strtab.sh_size)
992: return;
993: s->disas_num_syms = symtab.sh_size / sizeof(struct elf_sym);
994: s->next = syminfos;
995: syminfos = s;
996: }
997:
998: static int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
999: struct image_info * info)
1000: {
1001: struct elfhdr elf_ex;
1002: struct elfhdr interp_elf_ex;
1003: struct exec interp_ex;
1004: int interpreter_fd = -1; /* avoid warning */
1005: unsigned long load_addr, load_bias;
1006: int load_addr_set = 0;
1007: unsigned int interpreter_type = INTERPRETER_NONE;
1008: unsigned char ibcs2_interpreter;
1009: int i;
1010: unsigned long mapped_addr;
1011: struct elf_phdr * elf_ppnt;
1012: struct elf_phdr *elf_phdata;
1013: unsigned long elf_bss, k, elf_brk;
1014: int retval;
1015: char * elf_interpreter;
1016: unsigned long elf_entry, interp_load_addr = 0;
1017: int status;
1018: unsigned long start_code, end_code, end_data;
1019: unsigned long elf_stack;
1020: char passed_fileno[6];
1021:
1022: ibcs2_interpreter = 0;
1023: status = 0;
1024: load_addr = 0;
1025: load_bias = 0;
1026: elf_ex = *((struct elfhdr *) bprm->buf); /* exec-header */
1027: #ifdef BSWAP_NEEDED
1028: bswap_ehdr(&elf_ex);
1029: #endif
1030:
1031: if (elf_ex.e_ident[0] != 0x7f ||
1032: strncmp(&elf_ex.e_ident[1], "ELF",3) != 0) {
1033: return -ENOEXEC;
1034: }
1035:
1036: /* First of all, some simple consistency checks */
1037: if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) ||
1038: (! elf_check_arch(elf_ex.e_machine))) {
1039: return -ENOEXEC;
1040: }
1041:
1042: /* Now read in all of the header information */
1043: elf_phdata = (struct elf_phdr *)malloc(elf_ex.e_phentsize*elf_ex.e_phnum);
1044: if (elf_phdata == NULL) {
1045: return -ENOMEM;
1046: }
1047:
1048: retval = lseek(bprm->fd, elf_ex.e_phoff, SEEK_SET);
1049: if(retval > 0) {
1050: retval = read(bprm->fd, (char *) elf_phdata,
1051: elf_ex.e_phentsize * elf_ex.e_phnum);
1052: }
1053:
1054: if (retval < 0) {
1055: perror("load_elf_binary");
1056: exit(-1);
1057: free (elf_phdata);
1058: return -errno;
1059: }
1060:
1061: #ifdef BSWAP_NEEDED
1062: elf_ppnt = elf_phdata;
1063: for (i=0; i<elf_ex.e_phnum; i++, elf_ppnt++) {
1064: bswap_phdr(elf_ppnt);
1065: }
1066: #endif
1067: elf_ppnt = elf_phdata;
1068:
1069: elf_bss = 0;
1070: elf_brk = 0;
1071:
1072:
1073: elf_stack = ~0UL;
1074: elf_interpreter = NULL;
1075: start_code = ~0UL;
1076: end_code = 0;
1077: end_data = 0;
1078:
1079: for(i=0;i < elf_ex.e_phnum; i++) {
1080: if (elf_ppnt->p_type == PT_INTERP) {
1081: if ( elf_interpreter != NULL )
1082: {
1083: free (elf_phdata);
1084: free(elf_interpreter);
1085: close(bprm->fd);
1086: return -EINVAL;
1087: }
1088:
1089: /* This is the program interpreter used for
1090: * shared libraries - for now assume that this
1091: * is an a.out format binary
1092: */
1093:
1094: elf_interpreter = (char *)malloc(elf_ppnt->p_filesz);
1095:
1096: if (elf_interpreter == NULL) {
1097: free (elf_phdata);
1098: close(bprm->fd);
1099: return -ENOMEM;
1100: }
1101:
1102: retval = lseek(bprm->fd, elf_ppnt->p_offset, SEEK_SET);
1103: if(retval >= 0) {
1104: retval = read(bprm->fd, elf_interpreter, elf_ppnt->p_filesz);
1105: }
1106: if(retval < 0) {
1107: perror("load_elf_binary2");
1108: exit(-1);
1109: }
1110:
1111: /* If the program interpreter is one of these two,
1112: then assume an iBCS2 image. Otherwise assume
1113: a native linux image. */
1114:
1115: /* JRP - Need to add X86 lib dir stuff here... */
1116:
1117: if (strcmp(elf_interpreter,"/usr/lib/libc.so.1") == 0 ||
1118: strcmp(elf_interpreter,"/usr/lib/ld.so.1") == 0) {
1119: ibcs2_interpreter = 1;
1120: }
1121:
1122: #if 0
1123: printf("Using ELF interpreter %s\n", elf_interpreter);
1124: #endif
1125: if (retval >= 0) {
1126: retval = open(path(elf_interpreter), O_RDONLY);
1127: if(retval >= 0) {
1128: interpreter_fd = retval;
1129: }
1130: else {
1131: perror(elf_interpreter);
1132: exit(-1);
1133: /* retval = -errno; */
1134: }
1135: }
1136:
1137: if (retval >= 0) {
1138: retval = lseek(interpreter_fd, 0, SEEK_SET);
1139: if(retval >= 0) {
1140: retval = read(interpreter_fd,bprm->buf,128);
1141: }
1142: }
1143: if (retval >= 0) {
1144: interp_ex = *((struct exec *) bprm->buf); /* aout exec-header */
1145: interp_elf_ex=*((struct elfhdr *) bprm->buf); /* elf exec-header */
1146: }
1147: if (retval < 0) {
1148: perror("load_elf_binary3");
1149: exit(-1);
1150: free (elf_phdata);
1151: free(elf_interpreter);
1152: close(bprm->fd);
1153: return retval;
1154: }
1155: }
1156: elf_ppnt++;
1157: }
1158:
1159: /* Some simple consistency checks for the interpreter */
1160: if (elf_interpreter){
1161: interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT;
1162:
1163: /* Now figure out which format our binary is */
1164: if ((N_MAGIC(interp_ex) != OMAGIC) && (N_MAGIC(interp_ex) != ZMAGIC) &&
1165: (N_MAGIC(interp_ex) != QMAGIC)) {
1166: interpreter_type = INTERPRETER_ELF;
1167: }
1168:
1169: if (interp_elf_ex.e_ident[0] != 0x7f ||
1170: strncmp(&interp_elf_ex.e_ident[1], "ELF",3) != 0) {
1171: interpreter_type &= ~INTERPRETER_ELF;
1172: }
1173:
1174: if (!interpreter_type) {
1175: free(elf_interpreter);
1176: free(elf_phdata);
1177: close(bprm->fd);
1178: return -ELIBBAD;
1179: }
1180: }
1181:
1182: /* OK, we are done with that, now set up the arg stuff,
1183: and then start this sucker up */
1184:
1185: if (!bprm->sh_bang) {
1186: char * passed_p;
1187:
1188: if (interpreter_type == INTERPRETER_AOUT) {
1189: snprintf(passed_fileno, sizeof(passed_fileno), "%d", bprm->fd);
1190: passed_p = passed_fileno;
1191:
1192: if (elf_interpreter) {
1193: bprm->p = copy_strings(1,&passed_p,bprm->page,bprm->p);
1194: bprm->argc++;
1195: }
1196: }
1197: if (!bprm->p) {
1198: if (elf_interpreter) {
1199: free(elf_interpreter);
1200: }
1201: free (elf_phdata);
1202: close(bprm->fd);
1203: return -E2BIG;
1204: }
1205: }
1206:
1207: /* OK, This is the point of no return */
1208: info->end_data = 0;
1209: info->end_code = 0;
1210: info->start_mmap = (unsigned long)ELF_START_MMAP;
1211: info->mmap = 0;
1212: elf_entry = (unsigned long) elf_ex.e_entry;
1213:
1214: /* Do this so that we can load the interpreter, if need be. We will
1215: change some of these later */
1216: info->rss = 0;
1217: bprm->p = setup_arg_pages(bprm->p, bprm, info);
1218: info->start_stack = bprm->p;
1219:
1220: /* Now we do a little grungy work by mmaping the ELF image into
1221: * the correct location in memory. At this point, we assume that
1222: * the image should be loaded at fixed address, not at a variable
1223: * address.
1224: */
1225:
1226: for(i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum; i++, elf_ppnt++) {
1227: int elf_prot = 0;
1228: int elf_flags = 0;
1229: unsigned long error;
1230:
1231: if (elf_ppnt->p_type != PT_LOAD)
1232: continue;
1233:
1234: if (elf_ppnt->p_flags & PF_R) elf_prot |= PROT_READ;
1235: if (elf_ppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
1236: if (elf_ppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
1237: elf_flags = MAP_PRIVATE | MAP_DENYWRITE;
1238: if (elf_ex.e_type == ET_EXEC || load_addr_set) {
1239: elf_flags |= MAP_FIXED;
1240: } else if (elf_ex.e_type == ET_DYN) {
1241: /* Try and get dynamic programs out of the way of the default mmap
1242: base, as well as whatever program they might try to exec. This
1243: is because the brk will follow the loader, and is not movable. */
1244: /* NOTE: for qemu, we do a big mmap to get enough space
1245: without harcoding any address */
1246: error = target_mmap(0, ET_DYN_MAP_SIZE,
1247: PROT_NONE, MAP_PRIVATE | MAP_ANON,
1248: -1, 0);
1249: if (error == -1) {
1250: perror("mmap");
1251: exit(-1);
1252: }
1253: load_bias = TARGET_ELF_PAGESTART(error - elf_ppnt->p_vaddr);
1254: }
1255:
1256: error = target_mmap(TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr),
1257: (elf_ppnt->p_filesz +
1258: TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)),
1259: elf_prot,
1260: (MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE),
1261: bprm->fd,
1262: (elf_ppnt->p_offset -
1263: TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)));
1264: if (error == -1) {
1265: perror("mmap");
1266: exit(-1);
1267: }
1268:
1269: #ifdef LOW_ELF_STACK
1270: if (TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr) < elf_stack)
1271: elf_stack = TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr);
1272: #endif
1273:
1274: if (!load_addr_set) {
1275: load_addr_set = 1;
1276: load_addr = elf_ppnt->p_vaddr - elf_ppnt->p_offset;
1277: if (elf_ex.e_type == ET_DYN) {
1278: load_bias += error -
1279: TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr);
1280: load_addr += load_bias;
1281: }
1282: }
1283: k = elf_ppnt->p_vaddr;
1284: if (k < start_code)
1285: start_code = k;
1286: k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
1287: if (k > elf_bss)
1288: elf_bss = k;
1289: if ((elf_ppnt->p_flags & PF_X) && end_code < k)
1290: end_code = k;
1291: if (end_data < k)
1292: end_data = k;
1293: k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
1294: if (k > elf_brk) elf_brk = k;
1295: }
1296:
1297: elf_entry += load_bias;
1298: elf_bss += load_bias;
1299: elf_brk += load_bias;
1300: start_code += load_bias;
1301: end_code += load_bias;
1302: // start_data += load_bias;
1303: end_data += load_bias;
1304:
1305: if (elf_interpreter) {
1306: if (interpreter_type & 1) {
1307: elf_entry = load_aout_interp(&interp_ex, interpreter_fd);
1308: }
1309: else if (interpreter_type & 2) {
1310: elf_entry = load_elf_interp(&interp_elf_ex, interpreter_fd,
1311: &interp_load_addr);
1312: }
1313:
1314: close(interpreter_fd);
1315: free(elf_interpreter);
1316:
1317: if (elf_entry == ~0UL) {
1318: printf("Unable to load interpreter\n");
1319: free(elf_phdata);
1320: exit(-1);
1321: return 0;
1322: }
1323: }
1324:
1325: free(elf_phdata);
1326:
1327: if (loglevel)
1328: load_symbols(&elf_ex, bprm->fd);
1329:
1330: if (interpreter_type != INTERPRETER_AOUT) close(bprm->fd);
1331: info->personality = (ibcs2_interpreter ? PER_SVR4 : PER_LINUX);
1332:
1333: #ifdef LOW_ELF_STACK
1334: info->start_stack = bprm->p = elf_stack - 4;
1335: #endif
1336: bprm->p = (unsigned long)
1337: create_elf_tables((char *)bprm->p,
1338: bprm->argc,
1339: bprm->envc,
1340: &elf_ex,
1341: load_addr, load_bias,
1342: interp_load_addr,
1343: (interpreter_type == INTERPRETER_AOUT ? 0 : 1),
1344: info);
1345: if (interpreter_type == INTERPRETER_AOUT)
1346: info->arg_start += strlen(passed_fileno) + 1;
1347: info->start_brk = info->brk = elf_brk;
1348: info->end_code = end_code;
1349: info->start_code = start_code;
1350: info->end_data = end_data;
1351: info->start_stack = bprm->p;
1352:
1353: /* Calling set_brk effectively mmaps the pages that we need for the bss and break
1354: sections */
1355: set_brk(elf_bss, elf_brk);
1356:
1357: padzero(elf_bss);
1358:
1359: #if 0
1360: printf("(start_brk) %x\n" , info->start_brk);
1361: printf("(end_code) %x\n" , info->end_code);
1362: printf("(start_code) %x\n" , info->start_code);
1363: printf("(end_data) %x\n" , info->end_data);
1364: printf("(start_stack) %x\n" , info->start_stack);
1365: printf("(brk) %x\n" , info->brk);
1366: #endif
1367:
1368: if ( info->personality == PER_SVR4 )
1369: {
1370: /* Why this, you ask??? Well SVr4 maps page 0 as read-only,
1371: and some applications "depend" upon this behavior.
1372: Since we do not have the power to recompile these, we
1373: emulate the SVr4 behavior. Sigh. */
1374: mapped_addr = target_mmap(0, qemu_host_page_size, PROT_READ | PROT_EXEC,
1375: MAP_FIXED | MAP_PRIVATE, -1, 0);
1376: }
1377:
1378: #ifdef ELF_PLAT_INIT
1379: /*
1380: * The ABI may specify that certain registers be set up in special
1381: * ways (on i386 %edx is the address of a DT_FINI function, for
1382: * example. This macro performs whatever initialization to
1383: * the regs structure is required.
1384: */
1385: ELF_PLAT_INIT(regs);
1386: #endif
1387:
1388:
1389: info->entry = elf_entry;
1390:
1391: return 0;
1392: }
1393:
1394:
1395:
1396: int elf_exec(const char * filename, char ** argv, char ** envp,
1397: struct target_pt_regs * regs, struct image_info *infop)
1398: {
1399: struct linux_binprm bprm;
1400: int retval;
1401: int i;
1402:
1403: bprm.p = TARGET_PAGE_SIZE*MAX_ARG_PAGES-sizeof(unsigned int);
1404: for (i=0 ; i<MAX_ARG_PAGES ; i++) /* clear page-table */
1405: bprm.page[i] = 0;
1406: retval = open(filename, O_RDONLY);
1407: if (retval < 0)
1408: return retval;
1409: bprm.fd = retval;
1410: bprm.filename = (char *)filename;
1411: bprm.sh_bang = 0;
1412: bprm.loader = 0;
1413: bprm.exec = 0;
1414: bprm.dont_iput = 0;
1415: bprm.argc = count(argv);
1416: bprm.envc = count(envp);
1417:
1418: retval = prepare_binprm(&bprm);
1419:
1420: if(retval>=0) {
1421: bprm.p = copy_strings(1, &bprm.filename, bprm.page, bprm.p);
1422: bprm.exec = bprm.p;
1423: bprm.p = copy_strings(bprm.envc,envp,bprm.page,bprm.p);
1424: bprm.p = copy_strings(bprm.argc,argv,bprm.page,bprm.p);
1425: if (!bprm.p) {
1426: retval = -E2BIG;
1427: }
1428: }
1429:
1430: if(retval>=0) {
1431: retval = load_elf_binary(&bprm,regs,infop);
1432: }
1433: if(retval>=0) {
1434: /* success. Initialize important registers */
1435: init_thread(regs, infop);
1436: return retval;
1437: }
1438:
1439: /* Something went wrong, return the inode and free the argument pages*/
1440: for (i=0 ; i<MAX_ARG_PAGES ; i++) {
1441: free_page((void *)bprm.page[i]);
1442: }
1443: return(retval);
1444: }
1445:
1446:
1447: static int load_aout_interp(void * exptr, int interp_fd)
1448: {
1449: printf("a.out interpreter not yet supported\n");
1450: return(0);
1451: }
1452:
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