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1
/* This is the Linux kernel elf-loading code, ported into user space */
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#include <stdio.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <stdlib.h>
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#include <string.h>
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#include "qemu.h"
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#include "linux_bin.h"
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#include "elf.h"
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#include "segment.h"
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/* Necessary parameters */
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#define        ALPHA_PAGE_SIZE 4096
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#define        X86_PAGE_SIZE 4096
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#define ALPHA_PAGE_MASK (~(ALPHA_PAGE_SIZE-1))
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#define X86_PAGE_MASK (~(X86_PAGE_SIZE-1))
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#define ALPHA_PAGE_ALIGN(addr) ((((addr)+ALPHA_PAGE_SIZE)-1)&ALPHA_PAGE_MASK)
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#define X86_PAGE_ALIGN(addr) ((((addr)+X86_PAGE_SIZE)-1)&X86_PAGE_MASK)
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#define NGROUPS 32
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#define X86_ELF_EXEC_PAGESIZE X86_PAGE_SIZE
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#define X86_ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(X86_ELF_EXEC_PAGESIZE-1))
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#define X86_ELF_PAGEOFFSET(_v) ((_v) & (X86_ELF_EXEC_PAGESIZE-1))
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#define ALPHA_ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ALPHA_PAGE_SIZE-1))
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#define ALPHA_ELF_PAGEOFFSET(_v) ((_v) & (ALPHA_PAGE_SIZE-1))
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#define INTERPRETER_NONE 0
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#define INTERPRETER_AOUT 1
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#define INTERPRETER_ELF 2
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#define DLINFO_ITEMS 12
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/* Where we find X86 libraries... */
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//#define X86_DEFAULT_LIB_DIR        "/usr/x86/"
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#define X86_DEFAULT_LIB_DIR        "/"
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//extern void * mmap4k();
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#define mmap4k(a, b, c, d, e, f) mmap((void *)(a), b, c, d, e, f)
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extern unsigned long x86_stack_size;
52

    
53
static int load_aout_interp(void * exptr, int interp_fd);
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#ifdef BSWAP_NEEDED
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static void bswap_ehdr(Elf32_Ehdr *ehdr)
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{
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    bswap16s(&ehdr->e_type);                        /* Object file type */
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    bswap16s(&ehdr->e_machine);                /* Architecture */
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    bswap32s(&ehdr->e_version);                /* Object file version */
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    bswap32s(&ehdr->e_entry);                /* Entry point virtual address */
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    bswap32s(&ehdr->e_phoff);                /* Program header table file offset */
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    bswap32s(&ehdr->e_shoff);                /* Section header table file offset */
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    bswap32s(&ehdr->e_flags);                /* Processor-specific flags */
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    bswap16s(&ehdr->e_ehsize);                /* ELF header size in bytes */
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    bswap16s(&ehdr->e_phentsize);                /* Program header table entry size */
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    bswap16s(&ehdr->e_phnum);                /* Program header table entry count */
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    bswap16s(&ehdr->e_shentsize);                /* Section header table entry size */
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    bswap16s(&ehdr->e_shnum);                /* Section header table entry count */
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    bswap16s(&ehdr->e_shstrndx);                /* Section header string table index */
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}
72

    
73
static void bswap_phdr(Elf32_Phdr *phdr)
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{
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    bswap32s(&phdr->p_type);                        /* Segment type */
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    bswap32s(&phdr->p_offset);                /* Segment file offset */
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    bswap32s(&phdr->p_vaddr);                /* Segment virtual address */
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    bswap32s(&phdr->p_paddr);                /* Segment physical address */
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    bswap32s(&phdr->p_filesz);                /* Segment size in file */
80
    bswap32s(&phdr->p_memsz);                /* Segment size in memory */
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    bswap32s(&phdr->p_flags);                /* Segment flags */
82
    bswap32s(&phdr->p_align);                /* Segment alignment */
83
}
84
#endif
85

    
86
static void * get_free_page(void)
87
{
88
    void *        retval;
89

    
90
    /* User-space version of kernel get_free_page.  Returns a page-aligned
91
     * page-sized chunk of memory.
92
     */
93
    retval = mmap4k(0, ALPHA_PAGE_SIZE, PROT_READ|PROT_WRITE, 
94
                        MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
95

    
96
    if((long)retval == -1) {
97
        perror("get_free_page");
98
        exit(-1);
99
    }
100
    else {
101
        return(retval);
102
    }
103
}
104

    
105
static void free_page(void * pageaddr)
106
{
107
    (void)munmap(pageaddr, ALPHA_PAGE_SIZE);
108
}
109

    
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/*
111
 * 'copy_string()' copies argument/envelope strings from user
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 * memory to free pages in kernel mem. These are in a format ready
113
 * to be put directly into the top of new user memory.
114
 *
115
 */
116
static unsigned long copy_strings(int argc,char ** argv,unsigned long *page,
117
                unsigned long p)
118
{
119
    char *tmp, *tmp1, *pag = NULL;
120
    int len, offset = 0;
121

    
122
    if (!p) {
123
        return 0;       /* bullet-proofing */
124
    }
125
    while (argc-- > 0) {
126
        if (!(tmp1 = tmp = get_user(argv+argc))) {
127
            fprintf(stderr, "VFS: argc is wrong");
128
            exit(-1);
129
        }
130
        while (get_user(tmp++));
131
        len = tmp - tmp1;
132
        if (p < len) {  /* this shouldn't happen - 128kB */
133
                return 0;
134
        }
135
        while (len) {
136
            --p; --tmp; --len;
137
            if (--offset < 0) {
138
                offset = p % X86_PAGE_SIZE;
139
                if (!(pag = (char *) page[p/X86_PAGE_SIZE]) &&
140
                    !(pag = (char *) page[p/X86_PAGE_SIZE] =
141
                      (unsigned long *) get_free_page())) {
142
                        return 0;
143
                }
144
            }
145
            if (len == 0 || offset == 0) {
146
                *(pag + offset) = get_user(tmp);
147
            }
148
            else {
149
              int bytes_to_copy = (len > offset) ? offset : len;
150
              tmp -= bytes_to_copy;
151
              p -= bytes_to_copy;
152
              offset -= bytes_to_copy;
153
              len -= bytes_to_copy;
154
              memcpy_fromfs(pag + offset, tmp, bytes_to_copy + 1);
155
            }
156
        }
157
    }
158
    return p;
159
}
160

    
161
static int in_group_p(gid_t g)
162
{
163
    /* return TRUE if we're in the specified group, FALSE otherwise */
164
    int                ngroup;
165
    int                i;
166
    gid_t        grouplist[NGROUPS];
167

    
168
    ngroup = getgroups(NGROUPS, grouplist);
169
    for(i = 0; i < ngroup; i++) {
170
        if(grouplist[i] == g) {
171
            return 1;
172
        }
173
    }
174
    return 0;
175
}
176

    
177
static int count(char ** vec)
178
{
179
    int                i;
180

    
181
    for(i = 0; *vec; i++) {
182
        vec++;
183
    }
184

    
185
    return(i);
186
}
187

    
188
static int prepare_binprm(struct linux_binprm *bprm)
189
{
190
    struct stat                st;
191
    int mode;
192
    int retval, id_change;
193

    
194
    if(fstat(bprm->fd, &st) < 0) {
195
        return(-errno);
196
    }
197

    
198
    mode = st.st_mode;
199
    if(!S_ISREG(mode)) {        /* Must be regular file */
200
        return(-EACCES);
201
    }
202
    if(!(mode & 0111)) {        /* Must have at least one execute bit set */
203
        return(-EACCES);
204
    }
205

    
206
    bprm->e_uid = geteuid();
207
    bprm->e_gid = getegid();
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    id_change = 0;
209

    
210
    /* Set-uid? */
211
    if(mode & S_ISUID) {
212
            bprm->e_uid = st.st_uid;
213
        if(bprm->e_uid != geteuid()) {
214
            id_change = 1;
215
        }
216
    }
217

    
218
    /* Set-gid? */
219
    /*
220
     * If setgid is set but no group execute bit then this
221
     * is a candidate for mandatory locking, not a setgid
222
     * executable.
223
     */
224
    if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
225
        bprm->e_gid = st.st_gid;
226
        if (!in_group_p(bprm->e_gid)) {
227
                id_change = 1;
228
        }
229
    }
230

    
231
    memset(bprm->buf, 0, sizeof(bprm->buf));
232
    retval = lseek(bprm->fd, 0L, SEEK_SET);
233
    if(retval >= 0) {
234
        retval = read(bprm->fd, bprm->buf, 128);
235
    }
236
    if(retval < 0) {
237
        perror("prepare_binprm");
238
        exit(-1);
239
        /* return(-errno); */
240
    }
241
    else {
242
        return(retval);
243
    }
244
}
245

    
246
unsigned long setup_arg_pages(unsigned long p, struct linux_binprm * bprm,
247
                                                struct image_info * info)
248
{
249
    unsigned long stack_base;
250
    int i;
251
    extern unsigned long stktop;
252

    
253
    stack_base = X86_STACK_TOP - MAX_ARG_PAGES*X86_PAGE_SIZE;
254

    
255
    p += stack_base;
256
    if (bprm->loader) {
257
        bprm->loader += stack_base;
258
    }
259
    bprm->exec += stack_base;
260

    
261
    /* Create enough stack to hold everything.  If we don't use
262
     * it for args, we'll use it for something else...
263
     */
264
    /* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so
265
       we allocate a bigger stack. Need a better solution, for example
266
       by remapping the process stack directly at the right place */
267
    if(x86_stack_size >  MAX_ARG_PAGES*X86_PAGE_SIZE) {
268
        if((long)mmap4k((void *)(X86_STACK_TOP-x86_stack_size), x86_stack_size + X86_PAGE_SIZE,
269
                         PROT_READ | PROT_WRITE,
270
                     MAP_GROWSDOWN | MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0) == -1) {
271
            perror("stk mmap");
272
            exit(-1);
273
        }
274
    }
275
    else {
276
        if((long)mmap4k((void *)stack_base, (MAX_ARG_PAGES+1)*X86_PAGE_SIZE,
277
                         PROT_READ | PROT_WRITE,
278
                     MAP_GROWSDOWN | MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0) == -1) {
279
            perror("stk mmap");
280
            exit(-1);
281
        }
282
    }
283
    
284
    stktop = stack_base;
285

    
286
    for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
287
        if (bprm->page[i]) {
288
            info->rss++;
289

    
290
            memcpy((void *)stack_base, (void *)bprm->page[i], X86_PAGE_SIZE);
291
            free_page((void *)bprm->page[i]);
292
        }
293
        stack_base += X86_PAGE_SIZE;
294
    }
295
    return p;
296
}
297

    
298
static void set_brk(unsigned long start, unsigned long end)
299
{
300
        /* page-align the start and end addresses... */
301
        start = ALPHA_PAGE_ALIGN(start);
302
        end = ALPHA_PAGE_ALIGN(end);
303
        if (end <= start)
304
                return;
305
        if((long)mmap4k(start, end - start,
306
                PROT_READ | PROT_WRITE | PROT_EXEC,
307
                MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0) == -1) {
308
            perror("cannot mmap brk");
309
            exit(-1);
310
        }
311
}
312

    
313

    
314
/* We need to explicitly zero any fractional pages
315
   after the data section (i.e. bss).  This would
316
   contain the junk from the file that should not
317
   be in memory */
318

    
319

    
320
static void padzero(unsigned long elf_bss)
321
{
322
        unsigned long nbyte;
323
        char * fpnt;
324

    
325
        nbyte = elf_bss & (ALPHA_PAGE_SIZE-1);        /* was X86_PAGE_SIZE - JRP */
326
        if (nbyte) {
327
            nbyte = ALPHA_PAGE_SIZE - nbyte;
328
            fpnt = (char *) elf_bss;
329
            do {
330
                *fpnt++ = 0;
331
            } while (--nbyte);
332
        }
333
}
334

    
335
static unsigned int * create_elf_tables(char *p, int argc, int envc,
336
                                  struct elfhdr * exec,
337
                                  unsigned long load_addr,
338
                                  unsigned long interp_load_addr, int ibcs,
339
                                  struct image_info *info)
340
{
341
        target_ulong *argv, *envp, *dlinfo;
342
        target_ulong *sp;
343

    
344
        /*
345
         * Force 16 byte alignment here for generality.
346
         */
347
        sp = (unsigned int *) (~15UL & (unsigned long) p);
348
        sp -= exec ? DLINFO_ITEMS*2 : 2;
349
        dlinfo = sp;
350
        sp -= envc+1;
351
        envp = sp;
352
        sp -= argc+1;
353
        argv = sp;
354
        if (!ibcs) {
355
                put_user(tswapl((target_ulong)envp),--sp);
356
                put_user(tswapl((target_ulong)argv),--sp);
357
        }
358

    
359
#define NEW_AUX_ENT(id, val) \
360
          put_user (tswapl(id), dlinfo++); \
361
          put_user (tswapl(val), dlinfo++)
362

    
363
        if (exec) { /* Put this here for an ELF program interpreter */
364
          struct elf_phdr * eppnt;
365
          eppnt = (struct elf_phdr *)((unsigned long)exec->e_phoff);
366

    
367
          NEW_AUX_ENT (AT_PHDR, (unsigned int)(load_addr + exec->e_phoff));
368
          NEW_AUX_ENT (AT_PHENT, (unsigned int)(sizeof (struct elf_phdr)));
369
          NEW_AUX_ENT (AT_PHNUM, (unsigned int)(exec->e_phnum));
370
          NEW_AUX_ENT (AT_PAGESZ, (unsigned int)(ALPHA_PAGE_SIZE));
371
          NEW_AUX_ENT (AT_BASE, (unsigned int)(interp_load_addr));
372
          NEW_AUX_ENT (AT_FLAGS, (unsigned int)0);
373
          NEW_AUX_ENT (AT_ENTRY, (unsigned int) exec->e_entry);
374
          NEW_AUX_ENT (AT_UID, (unsigned int) getuid());
375
          NEW_AUX_ENT (AT_EUID, (unsigned int) geteuid());
376
          NEW_AUX_ENT (AT_GID, (unsigned int) getgid());
377
          NEW_AUX_ENT (AT_EGID, (unsigned int) getegid());
378
        }
379
        NEW_AUX_ENT (AT_NULL, 0);
380
#undef NEW_AUX_ENT
381
        put_user(tswapl(argc),--sp);
382
        info->arg_start = (unsigned int)((unsigned long)p & 0xffffffff);
383
        while (argc-->0) {
384
                put_user(tswapl((target_ulong)p),argv++);
385
                while (get_user(p++)) /* nothing */ ;
386
        }
387
        put_user(0,argv);
388
        info->arg_end = info->env_start = (unsigned int)((unsigned long)p & 0xffffffff);
389
        while (envc-->0) {
390
                put_user(tswapl((target_ulong)p),envp++);
391
                while (get_user(p++)) /* nothing */ ;
392
        }
393
        put_user(0,envp);
394
        info->env_end = (unsigned int)((unsigned long)p & 0xffffffff);
395
        return sp;
396
}
397

    
398

    
399

    
400
static unsigned long load_elf_interp(struct elfhdr * interp_elf_ex,
401
                                     int interpreter_fd,
402
                                     unsigned long *interp_load_addr)
403
{
404
        struct elf_phdr *elf_phdata  =  NULL;
405
        struct elf_phdr *eppnt;
406
        unsigned long load_addr;
407
        int load_addr_set = 0;
408
        int retval;
409
        unsigned long last_bss, elf_bss;
410
        unsigned long error;
411
        int i;
412
        
413
        elf_bss = 0;
414
        last_bss = 0;
415
        error = 0;
416

    
417
        /* We put this here so that mmap will search for the *first*
418
         * available memory...
419
         */
420
        load_addr = INTERP_LOADADDR;
421
        
422
        /* First of all, some simple consistency checks */
423
        if ((interp_elf_ex->e_type != ET_EXEC && 
424
            interp_elf_ex->e_type != ET_DYN) || 
425
           !elf_check_arch(interp_elf_ex->e_machine)) {
426
                return ~0UL;
427
        }
428
        
429
        /* Now read in all of the header information */
430
        
431
        if (sizeof(struct elf_phdr) * interp_elf_ex->e_phnum > X86_PAGE_SIZE)
432
            return ~0UL;
433
        
434
        elf_phdata =  (struct elf_phdr *) 
435
                malloc(sizeof(struct elf_phdr) * interp_elf_ex->e_phnum);
436

    
437
        if (!elf_phdata)
438
          return ~0UL;
439
        
440
        /*
441
         * If the size of this structure has changed, then punt, since
442
         * we will be doing the wrong thing.
443
         */
444
        if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr))
445
          {
446
            free(elf_phdata);
447
            return ~0UL;
448
          }
449

    
450
        retval = lseek(interpreter_fd, interp_elf_ex->e_phoff, SEEK_SET);
451
        if(retval >= 0) {
452
            retval = read(interpreter_fd,
453
                           (char *) elf_phdata,
454
                           sizeof(struct elf_phdr) * interp_elf_ex->e_phnum);
455
        }
456
        
457
        if (retval < 0) {
458
                perror("load_elf_interp");
459
                exit(-1);
460
                free (elf_phdata);
461
                return retval;
462
         }
463
#ifdef BSWAP_NEEDED
464
        eppnt = elf_phdata;
465
        for (i=0; i<interp_elf_ex->e_phnum; i++, eppnt++) {
466
            bswap_phdr(eppnt);
467
        }
468
#endif
469
        eppnt = elf_phdata;
470
        for(i=0; i<interp_elf_ex->e_phnum; i++, eppnt++)
471
          if (eppnt->p_type == PT_LOAD) {
472
            int elf_type = MAP_PRIVATE | MAP_DENYWRITE;
473
            int elf_prot = 0;
474
            unsigned long vaddr = 0;
475
            unsigned long k;
476

    
477
            if (eppnt->p_flags & PF_R) elf_prot =  PROT_READ;
478
            if (eppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
479
            if (eppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
480
            if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) {
481
                    elf_type |= MAP_FIXED;
482
                    vaddr = eppnt->p_vaddr;
483
            }
484
            error = (unsigned long)mmap4k(load_addr+X86_ELF_PAGESTART(vaddr),
485
                 eppnt->p_filesz + X86_ELF_PAGEOFFSET(eppnt->p_vaddr),
486
                 elf_prot,
487
                 elf_type,
488
                 interpreter_fd,
489
                 eppnt->p_offset - X86_ELF_PAGEOFFSET(eppnt->p_vaddr));
490
            
491
            if (error > -1024UL) {
492
              /* Real error */
493
              close(interpreter_fd);
494
              free(elf_phdata);
495
              return ~0UL;
496
            }
497

    
498
            if (!load_addr_set && interp_elf_ex->e_type == ET_DYN) {
499
              load_addr = error;
500
              load_addr_set = 1;
501
            }
502

    
503
            /*
504
             * Find the end of the file  mapping for this phdr, and keep
505
             * track of the largest address we see for this.
506
             */
507
            k = load_addr + eppnt->p_vaddr + eppnt->p_filesz;
508
            if (k > elf_bss) elf_bss = k;
509

    
510
            /*
511
             * Do the same thing for the memory mapping - between
512
             * elf_bss and last_bss is the bss section.
513
             */
514
            k = load_addr + eppnt->p_memsz + eppnt->p_vaddr;
515
            if (k > last_bss) last_bss = k;
516
          }
517
        
518
        /* Now use mmap to map the library into memory. */
519

    
520
        close(interpreter_fd);
521

    
522
        /*
523
         * Now fill out the bss section.  First pad the last page up
524
         * to the page boundary, and then perform a mmap to make sure
525
         * that there are zeromapped pages up to and including the last
526
         * bss page.
527
         */
528
        padzero(elf_bss);
529
        elf_bss = X86_ELF_PAGESTART(elf_bss + ALPHA_PAGE_SIZE - 1); /* What we have mapped so far */
530

    
531
        /* Map the last of the bss segment */
532
        if (last_bss > elf_bss) {
533
          mmap4k(elf_bss, last_bss-elf_bss,
534
                  PROT_READ|PROT_WRITE|PROT_EXEC,
535
                  MAP_FIXED|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
536
        }
537
        free(elf_phdata);
538

    
539
        *interp_load_addr = load_addr;
540
        return ((unsigned long) interp_elf_ex->e_entry) + load_addr;
541
}
542

    
543

    
544

    
545
static int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
546
                           struct image_info * info)
547
{
548
    struct elfhdr elf_ex;
549
    struct elfhdr interp_elf_ex;
550
    struct exec interp_ex;
551
    int interpreter_fd = -1; /* avoid warning */
552
    unsigned long load_addr;
553
    int load_addr_set = 0;
554
    unsigned int interpreter_type = INTERPRETER_NONE;
555
    unsigned char ibcs2_interpreter;
556
    int i;
557
    void * mapped_addr;
558
    struct elf_phdr * elf_ppnt;
559
    struct elf_phdr *elf_phdata;
560
    unsigned long elf_bss, k, elf_brk;
561
    int retval;
562
    char * elf_interpreter;
563
    unsigned long elf_entry, interp_load_addr = 0;
564
    int status;
565
    unsigned long start_code, end_code, end_data;
566
    unsigned long elf_stack;
567
    char passed_fileno[6];
568

    
569
    ibcs2_interpreter = 0;
570
    status = 0;
571
    load_addr = 0;
572
    elf_ex = *((struct elfhdr *) bprm->buf);          /* exec-header */
573
#ifdef BSWAP_NEEDED
574
    bswap_ehdr(&elf_ex);
575
#endif
576

    
577
    if (elf_ex.e_ident[0] != 0x7f ||
578
        strncmp(&elf_ex.e_ident[1], "ELF",3) != 0) {
579
            return  -ENOEXEC;
580
    }
581

    
582
    /* First of all, some simple consistency checks */
583
    if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) ||
584
                                       (! elf_check_arch(elf_ex.e_machine))) {
585
            return -ENOEXEC;
586
    }
587

    
588
    /* Now read in all of the header information */
589

    
590
    elf_phdata = (struct elf_phdr *)malloc(elf_ex.e_phentsize*elf_ex.e_phnum);
591
    if (elf_phdata == NULL) {
592
        return -ENOMEM;
593
    }
594

    
595
    retval = lseek(bprm->fd, elf_ex.e_phoff, SEEK_SET);
596
    if(retval > 0) {
597
        retval = read(bprm->fd, (char *) elf_phdata, 
598
                                elf_ex.e_phentsize * elf_ex.e_phnum);
599
    }
600

    
601
    if (retval < 0) {
602
        perror("load_elf_binary");
603
        exit(-1);
604
        free (elf_phdata);
605
        return -errno;
606
    }
607

    
608
#ifdef BSWAP_NEEDED
609
    elf_ppnt = elf_phdata;
610
    for (i=0; i<elf_ex.e_phnum; i++, elf_ppnt++) {
611
        bswap_phdr(elf_ppnt);
612
    }
613
#endif
614
    elf_ppnt = elf_phdata;
615

    
616
    elf_bss = 0;
617
    elf_brk = 0;
618

    
619

    
620
    elf_stack = ~0UL;
621
    elf_interpreter = NULL;
622
    start_code = ~0UL;
623
    end_code = 0;
624
    end_data = 0;
625

    
626
    for(i=0;i < elf_ex.e_phnum; i++) {
627
        if (elf_ppnt->p_type == PT_INTERP) {
628
            if ( elf_interpreter != NULL )
629
            {
630
                free (elf_phdata);
631
                free(elf_interpreter);
632
                close(bprm->fd);
633
                return -EINVAL;
634
            }
635

    
636
            /* This is the program interpreter used for
637
             * shared libraries - for now assume that this
638
             * is an a.out format binary
639
             */
640

    
641
            elf_interpreter = (char *)malloc(elf_ppnt->p_filesz+strlen(X86_DEFAULT_LIB_DIR));
642

    
643
            if (elf_interpreter == NULL) {
644
                free (elf_phdata);
645
                close(bprm->fd);
646
                return -ENOMEM;
647
            }
648

    
649
            strcpy(elf_interpreter, X86_DEFAULT_LIB_DIR);
650
            retval = lseek(bprm->fd, elf_ppnt->p_offset, SEEK_SET);
651
            if(retval >= 0) {
652
                retval = read(bprm->fd, 
653
                              elf_interpreter+strlen(X86_DEFAULT_LIB_DIR), 
654
                              elf_ppnt->p_filesz);
655
            }
656
            if(retval < 0) {
657
                 perror("load_elf_binary2");
658
                exit(-1);
659
            }        
660

    
661
            /* If the program interpreter is one of these two,
662
               then assume an iBCS2 image. Otherwise assume
663
               a native linux image. */
664

    
665
            /* JRP - Need to add X86 lib dir stuff here... */
666

    
667
            if (strcmp(elf_interpreter,"/usr/lib/libc.so.1") == 0 ||
668
                strcmp(elf_interpreter,"/usr/lib/ld.so.1") == 0) {
669
              ibcs2_interpreter = 1;
670
            }
671

    
672
#if 0
673
            printf("Using ELF interpreter %s\n", elf_interpreter);
674
#endif
675
            if (retval >= 0) {
676
                retval = open(elf_interpreter, O_RDONLY);
677
                if(retval >= 0) {
678
                    interpreter_fd = retval;
679
                }
680
                else {
681
                    perror(elf_interpreter);
682
                    exit(-1);
683
                    /* retval = -errno; */
684
                }
685
            }
686

    
687
            if (retval >= 0) {
688
                retval = lseek(interpreter_fd, 0, SEEK_SET);
689
                if(retval >= 0) {
690
                    retval = read(interpreter_fd,bprm->buf,128);
691
                }
692
            }
693
            if (retval >= 0) {
694
                interp_ex = *((struct exec *) bprm->buf); /* aout exec-header */
695
                interp_elf_ex=*((struct elfhdr *) bprm->buf); /* elf exec-header */
696
            }
697
            if (retval < 0) {
698
                perror("load_elf_binary3");
699
                exit(-1);
700
                free (elf_phdata);
701
                free(elf_interpreter);
702
                close(bprm->fd);
703
                return retval;
704
            }
705
        }
706
        elf_ppnt++;
707
    }
708

    
709
    /* Some simple consistency checks for the interpreter */
710
    if (elf_interpreter){
711
        interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT;
712

    
713
        /* Now figure out which format our binary is */
714
        if ((N_MAGIC(interp_ex) != OMAGIC) && (N_MAGIC(interp_ex) != ZMAGIC) &&
715
                    (N_MAGIC(interp_ex) != QMAGIC)) {
716
          interpreter_type = INTERPRETER_ELF;
717
        }
718

    
719
        if (interp_elf_ex.e_ident[0] != 0x7f ||
720
                    strncmp(&interp_elf_ex.e_ident[1], "ELF",3) != 0) {
721
            interpreter_type &= ~INTERPRETER_ELF;
722
        }
723

    
724
        if (!interpreter_type) {
725
            free(elf_interpreter);
726
            free(elf_phdata);
727
            close(bprm->fd);
728
            return -ELIBBAD;
729
        }
730
    }
731

    
732
    /* OK, we are done with that, now set up the arg stuff,
733
       and then start this sucker up */
734

    
735
    if (!bprm->sh_bang) {
736
        char * passed_p;
737

    
738
        if (interpreter_type == INTERPRETER_AOUT) {
739
            sprintf(passed_fileno, "%d", bprm->fd);
740
            passed_p = passed_fileno;
741

    
742
            if (elf_interpreter) {
743
                bprm->p = copy_strings(1,&passed_p,bprm->page,bprm->p);
744
                bprm->argc++;
745
            }
746
        }
747
        if (!bprm->p) {
748
            if (elf_interpreter) {
749
                free(elf_interpreter);
750
            }
751
            free (elf_phdata);
752
            close(bprm->fd);
753
            return -E2BIG;
754
        }
755
    }
756

    
757
    /* OK, This is the point of no return */
758
    info->end_data = 0;
759
    info->end_code = 0;
760
    info->start_mmap = (unsigned long)ELF_START_MMAP;
761
    info->mmap = 0;
762
    elf_entry = (unsigned long) elf_ex.e_entry;
763

    
764
    /* Do this so that we can load the interpreter, if need be.  We will
765
       change some of these later */
766
    info->rss = 0;
767
    bprm->p = setup_arg_pages(bprm->p, bprm, info);
768
    info->start_stack = bprm->p;
769

    
770
    /* Now we do a little grungy work by mmaping the ELF image into
771
     * the correct location in memory.  At this point, we assume that
772
     * the image should be loaded at fixed address, not at a variable
773
     * address.
774
     */
775

    
776

    
777

    
778
    for(i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum; i++, elf_ppnt++) {
779
        if (elf_ppnt->p_type == PT_LOAD) {
780
            int elf_prot = 0;
781
            if (elf_ppnt->p_flags & PF_R) elf_prot |= PROT_READ;
782
            if (elf_ppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
783
            if (elf_ppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
784

    
785
            mapped_addr = mmap4k(X86_ELF_PAGESTART(elf_ppnt->p_vaddr),
786
                    (elf_ppnt->p_filesz +
787
                            X86_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)),
788
                    elf_prot,
789
                    (MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE),
790
                    bprm->fd,
791
                    (elf_ppnt->p_offset - 
792
                            X86_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)));
793

    
794
            if((unsigned long)mapped_addr == 0xffffffffffffffff) {
795
                perror("mmap");
796
                exit(-1);
797
            }
798

    
799

    
800

    
801
#ifdef LOW_ELF_STACK
802
            if (X86_ELF_PAGESTART(elf_ppnt->p_vaddr) < elf_stack)
803
                    elf_stack = X86_ELF_PAGESTART(elf_ppnt->p_vaddr);
804
#endif
805

    
806
            if (!load_addr_set) {
807
                load_addr = elf_ppnt->p_vaddr - elf_ppnt->p_offset;
808
                load_addr_set = 1;
809
            }
810
            k = elf_ppnt->p_vaddr;
811
            if (k < start_code) start_code = k;
812
            k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
813
            if (k > elf_bss) elf_bss = k;
814
#if 1
815
            if ((elf_ppnt->p_flags & PF_X) && end_code <  k)
816
#else
817
            if ( !(elf_ppnt->p_flags & PF_W) && end_code <  k)
818
#endif
819
                    end_code = k;
820
            if (end_data < k) end_data = k;
821
            k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
822
            if (k > elf_brk) elf_brk = k;
823
        }
824
    }
825

    
826
    if (elf_interpreter) {
827
        if (interpreter_type & 1) {
828
            elf_entry = load_aout_interp(&interp_ex, interpreter_fd);
829
        }
830
        else if (interpreter_type & 2) {
831
            elf_entry = load_elf_interp(&interp_elf_ex, interpreter_fd,
832
                                            &interp_load_addr);
833
        }
834

    
835
        close(interpreter_fd);
836
        free(elf_interpreter);
837

    
838
        if (elf_entry == ~0UL) {
839
            printf("Unable to load interpreter\n");
840
            free(elf_phdata);
841
            exit(-1);
842
            return 0;
843
        }
844
    }
845

    
846
    free(elf_phdata);
847

    
848
    if (interpreter_type != INTERPRETER_AOUT) close(bprm->fd);
849
    info->personality = (ibcs2_interpreter ? PER_SVR4 : PER_LINUX);
850

    
851
#ifdef LOW_ELF_STACK
852
    info->start_stack = bprm->p = elf_stack - 4;
853
#endif
854
    bprm->p = (unsigned long)
855
      create_elf_tables((char *)bprm->p,
856
                    bprm->argc,
857
                    bprm->envc,
858
                    (interpreter_type == INTERPRETER_ELF ? &elf_ex : NULL),
859
                    load_addr,
860
                    interp_load_addr,
861
                    (interpreter_type == INTERPRETER_AOUT ? 0 : 1),
862
                    info);
863
    if (interpreter_type == INTERPRETER_AOUT)
864
      info->arg_start += strlen(passed_fileno) + 1;
865
    info->start_brk = info->brk = elf_brk;
866
    info->end_code = end_code;
867
    info->start_code = start_code;
868
    info->end_data = end_data;
869
    info->start_stack = bprm->p;
870

    
871
    /* Calling set_brk effectively mmaps the pages that we need for the bss and break
872
       sections */
873
    set_brk(elf_bss, elf_brk);
874

    
875
    padzero(elf_bss);
876

    
877
#if 0
878
    printf("(start_brk) %x\n" , info->start_brk);
879
    printf("(end_code) %x\n" , info->end_code);
880
    printf("(start_code) %x\n" , info->start_code);
881
    printf("(end_data) %x\n" , info->end_data);
882
    printf("(start_stack) %x\n" , info->start_stack);
883
    printf("(brk) %x\n" , info->brk);
884
#endif
885

    
886
    if ( info->personality == PER_SVR4 )
887
    {
888
            /* Why this, you ask???  Well SVr4 maps page 0 as read-only,
889
               and some applications "depend" upon this behavior.
890
               Since we do not have the power to recompile these, we
891
               emulate the SVr4 behavior.  Sigh.  */
892
            mapped_addr = mmap4k(NULL, ALPHA_PAGE_SIZE, PROT_READ | PROT_EXEC,
893
                            MAP_FIXED | MAP_PRIVATE, -1, 0);
894
    }
895

    
896
#ifdef ELF_PLAT_INIT
897
    /*
898
     * The ABI may specify that certain registers be set up in special
899
     * ways (on i386 %edx is the address of a DT_FINI function, for
900
     * example.  This macro performs whatever initialization to
901
     * the regs structure is required.
902
     */
903
    ELF_PLAT_INIT(regs);
904
#endif
905

    
906

    
907
    info->entry = elf_entry;
908

    
909
    return 0;
910
}
911

    
912

    
913

    
914
int elf_exec(const char * filename, char ** argv, char ** envp, 
915
             struct target_pt_regs * regs, struct image_info *infop)
916
{
917
        struct linux_binprm bprm;
918
        int retval;
919
        int i;
920

    
921
        bprm.p = X86_PAGE_SIZE*MAX_ARG_PAGES-sizeof(unsigned int);
922
        for (i=0 ; i<MAX_ARG_PAGES ; i++)       /* clear page-table */
923
                bprm.page[i] = 0;
924
        retval = open(filename, O_RDONLY);
925
        if (retval == -1) {
926
            perror(filename);
927
            exit(-1);
928
            /* return retval; */
929
        }
930
        else {
931
            bprm.fd = retval;
932
        }
933
        bprm.filename = (char *)filename;
934
        bprm.sh_bang = 0;
935
        bprm.loader = 0;
936
        bprm.exec = 0;
937
        bprm.dont_iput = 0;
938
        bprm.argc = count(argv);
939
        bprm.envc = count(envp);
940

    
941
        retval = prepare_binprm(&bprm);
942

    
943
        if(retval>=0) {
944
            bprm.p = copy_strings(1, &bprm.filename, bprm.page, bprm.p);
945
            bprm.exec = bprm.p;
946
            bprm.p = copy_strings(bprm.envc,envp,bprm.page,bprm.p);
947
            bprm.p = copy_strings(bprm.argc,argv,bprm.page,bprm.p);
948
            if (!bprm.p) {
949
                retval = -E2BIG;
950
            }
951
        }
952

    
953
        if(retval>=0) {
954
            retval = load_elf_binary(&bprm,regs,infop);
955
        }
956
        if(retval>=0) {
957
            /* success.  Initialize important registers */
958
            regs->esp = infop->start_stack;
959
            regs->eip = infop->entry;
960
            return retval;
961
        }
962

    
963
        /* Something went wrong, return the inode and free the argument pages*/
964
        for (i=0 ; i<MAX_ARG_PAGES ; i++) {
965
            free_page((void *)bprm.page[i]);
966
        }
967
        return(retval);
968
}
969

    
970

    
971
static int load_aout_interp(void * exptr, int interp_fd)
972
{
973
    printf("a.out interpreter not yet supported\n");
974
    return(0);
975
}
976