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virtio-9p: Add P9_TVERSION support
[qemu/aliguori-queue.git] / linux-user / elfload.c
blob4d3dd89b2b43ab0d39d67b28a7ad90e84bb4c6e6
1 /* This is the Linux kernel elf-loading code, ported into user space */
2 #include <sys/time.h>
3 #include <sys/param.h>
4
5 #include <stdio.h>
6 #include <sys/types.h>
7 #include <fcntl.h>
8 #include <errno.h>
9 #include <unistd.h>
10 #include <sys/mman.h>
11 #include <sys/resource.h>
12 #include <stdlib.h>
13 #include <string.h>
14 #include <time.h>
15
16 #include "qemu.h"
17 #include "disas.h"
18
19 #ifdef _ARCH_PPC64
20 #undef ARCH_DLINFO
21 #undef ELF_PLATFORM
22 #undef ELF_HWCAP
23 #undef ELF_CLASS
24 #undef ELF_DATA
25 #undef ELF_ARCH
26 #endif
27
28 #define ELF_OSABI ELFOSABI_SYSV
29
30 /* from personality.h */
31
32 /*
33 * Flags for bug emulation.
34 *
35 * These occupy the top three bytes.
36 */
37 enum {
38 ADDR_NO_RANDOMIZE = 0x0040000, /* disable randomization of VA space */
39 FDPIC_FUNCPTRS = 0x0080000, /* userspace function ptrs point to descriptors
40 * (signal handling)
41 */
42 MMAP_PAGE_ZERO = 0x0100000,
43 ADDR_COMPAT_LAYOUT = 0x0200000,
44 READ_IMPLIES_EXEC = 0x0400000,
45 ADDR_LIMIT_32BIT = 0x0800000,
46 SHORT_INODE = 0x1000000,
47 WHOLE_SECONDS = 0x2000000,
48 STICKY_TIMEOUTS = 0x4000000,
49 ADDR_LIMIT_3GB = 0x8000000,
50 };
51
52 /*
53 * Personality types.
54 *
55 * These go in the low byte. Avoid using the top bit, it will
56 * conflict with error returns.
57 */
58 enum {
59 PER_LINUX = 0x0000,
60 PER_LINUX_32BIT = 0x0000 | ADDR_LIMIT_32BIT,
61 PER_LINUX_FDPIC = 0x0000 | FDPIC_FUNCPTRS,
62 PER_SVR4 = 0x0001 | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
63 PER_SVR3 = 0x0002 | STICKY_TIMEOUTS | SHORT_INODE,
64 PER_SCOSVR3 = 0x0003 | STICKY_TIMEOUTS |
65 WHOLE_SECONDS | SHORT_INODE,
66 PER_OSR5 = 0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS,
67 PER_WYSEV386 = 0x0004 | STICKY_TIMEOUTS | SHORT_INODE,
68 PER_ISCR4 = 0x0005 | STICKY_TIMEOUTS,
69 PER_BSD = 0x0006,
70 PER_SUNOS = 0x0006 | STICKY_TIMEOUTS,
71 PER_XENIX = 0x0007 | STICKY_TIMEOUTS | SHORT_INODE,
72 PER_LINUX32 = 0x0008,
73 PER_LINUX32_3GB = 0x0008 | ADDR_LIMIT_3GB,
74 PER_IRIX32 = 0x0009 | STICKY_TIMEOUTS,/* IRIX5 32-bit */
75 PER_IRIXN32 = 0x000a | STICKY_TIMEOUTS,/* IRIX6 new 32-bit */
76 PER_IRIX64 = 0x000b | STICKY_TIMEOUTS,/* IRIX6 64-bit */
77 PER_RISCOS = 0x000c,
78 PER_SOLARIS = 0x000d | STICKY_TIMEOUTS,
79 PER_UW7 = 0x000e | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
80 PER_OSF4 = 0x000f, /* OSF/1 v4 */
81 PER_HPUX = 0x0010,
82 PER_MASK = 0x00ff,
83 };
84
85 /*
86 * Return the base personality without flags.
87 */
88 #define personality(pers) (pers & PER_MASK)
89
90 /* this flag is uneffective under linux too, should be deleted */
91 #ifndef MAP_DENYWRITE
92 #define MAP_DENYWRITE 0
93 #endif
94
95 /* should probably go in elf.h */
96 #ifndef ELIBBAD
97 #define ELIBBAD 80
98 #endif
99
100 typedef target_ulong target_elf_greg_t;
101 #ifdef USE_UID16
102 typedef uint16_t target_uid_t;
103 typedef uint16_t target_gid_t;
104 #else
105 typedef uint32_t target_uid_t;
106 typedef uint32_t target_gid_t;
107 #endif
108 typedef int32_t target_pid_t;
109
110 #ifdef TARGET_I386
111
112 #define ELF_PLATFORM get_elf_platform()
113
114 static const char *get_elf_platform(void)
115 {
116 static char elf_platform[] = "i386";
117 int family = (thread_env->cpuid_version >> 8) & 0xff;
118 if (family > 6)
119 family = 6;
120 if (family >= 3)
121 elf_platform[1] = '0' + family;
122 return elf_platform;
123 }
124
125 #define ELF_HWCAP get_elf_hwcap()
126
127 static uint32_t get_elf_hwcap(void)
128 {
129 return thread_env->cpuid_features;
130 }
131
132 #ifdef TARGET_X86_64
133 #define ELF_START_MMAP 0x2aaaaab000ULL
134 #define elf_check_arch(x) ( ((x) == ELF_ARCH) )
135
136 #define ELF_CLASS ELFCLASS64
137 #define ELF_DATA ELFDATA2LSB
138 #define ELF_ARCH EM_X86_64
139
140 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
141 {
142 regs->rax = 0;
143 regs->rsp = infop->start_stack;
144 regs->rip = infop->entry;
145 }
146
147 #define ELF_NREG 27
148 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
149
150 /*
151 * Note that ELF_NREG should be 29 as there should be place for
152 * TRAPNO and ERR "registers" as well but linux doesn't dump
153 * those.
154 *
155 * See linux kernel: arch/x86/include/asm/elf.h
156 */
157 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUState *env)
158 {
159 (*regs)[0] = env->regs[15];
160 (*regs)[1] = env->regs[14];
161 (*regs)[2] = env->regs[13];
162 (*regs)[3] = env->regs[12];
163 (*regs)[4] = env->regs[R_EBP];
164 (*regs)[5] = env->regs[R_EBX];
165 (*regs)[6] = env->regs[11];
166 (*regs)[7] = env->regs[10];
167 (*regs)[8] = env->regs[9];
168 (*regs)[9] = env->regs[8];
169 (*regs)[10] = env->regs[R_EAX];
170 (*regs)[11] = env->regs[R_ECX];
171 (*regs)[12] = env->regs[R_EDX];
172 (*regs)[13] = env->regs[R_ESI];
173 (*regs)[14] = env->regs[R_EDI];
174 (*regs)[15] = env->regs[R_EAX]; /* XXX */
175 (*regs)[16] = env->eip;
176 (*regs)[17] = env->segs[R_CS].selector & 0xffff;
177 (*regs)[18] = env->eflags;
178 (*regs)[19] = env->regs[R_ESP];
179 (*regs)[20] = env->segs[R_SS].selector & 0xffff;
180 (*regs)[21] = env->segs[R_FS].selector & 0xffff;
181 (*regs)[22] = env->segs[R_GS].selector & 0xffff;
182 (*regs)[23] = env->segs[R_DS].selector & 0xffff;
183 (*regs)[24] = env->segs[R_ES].selector & 0xffff;
184 (*regs)[25] = env->segs[R_FS].selector & 0xffff;
185 (*regs)[26] = env->segs[R_GS].selector & 0xffff;
186 }
187
188 #else
189
190 #define ELF_START_MMAP 0x80000000
191
192 /*
193 * This is used to ensure we don't load something for the wrong architecture.
194 */
195 #define elf_check_arch(x) ( ((x) == EM_386) || ((x) == EM_486) )
196
197 /*
198 * These are used to set parameters in the core dumps.
199 */
200 #define ELF_CLASS ELFCLASS32
201 #define ELF_DATA ELFDATA2LSB
202 #define ELF_ARCH EM_386
203
204 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
205 {
206 regs->esp = infop->start_stack;
207 regs->eip = infop->entry;
208
209 /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program
210 starts %edx contains a pointer to a function which might be
211 registered using `atexit'. This provides a mean for the
212 dynamic linker to call DT_FINI functions for shared libraries
213 that have been loaded before the code runs.
214
215 A value of 0 tells we have no such handler. */
216 regs->edx = 0;
217 }
218
219 #define ELF_NREG 17
220 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
221
222 /*
223 * Note that ELF_NREG should be 19 as there should be place for
224 * TRAPNO and ERR "registers" as well but linux doesn't dump
225 * those.
226 *
227 * See linux kernel: arch/x86/include/asm/elf.h
228 */
229 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUState *env)
230 {
231 (*regs)[0] = env->regs[R_EBX];
232 (*regs)[1] = env->regs[R_ECX];
233 (*regs)[2] = env->regs[R_EDX];
234 (*regs)[3] = env->regs[R_ESI];
235 (*regs)[4] = env->regs[R_EDI];
236 (*regs)[5] = env->regs[R_EBP];
237 (*regs)[6] = env->regs[R_EAX];
238 (*regs)[7] = env->segs[R_DS].selector & 0xffff;
239 (*regs)[8] = env->segs[R_ES].selector & 0xffff;
240 (*regs)[9] = env->segs[R_FS].selector & 0xffff;
241 (*regs)[10] = env->segs[R_GS].selector & 0xffff;
242 (*regs)[11] = env->regs[R_EAX]; /* XXX */
243 (*regs)[12] = env->eip;
244 (*regs)[13] = env->segs[R_CS].selector & 0xffff;
245 (*regs)[14] = env->eflags;
246 (*regs)[15] = env->regs[R_ESP];
247 (*regs)[16] = env->segs[R_SS].selector & 0xffff;
248 }
249 #endif
250
251 #define USE_ELF_CORE_DUMP
252 #define ELF_EXEC_PAGESIZE 4096
253
254 #endif
255
256 #ifdef TARGET_ARM
257
258 #define ELF_START_MMAP 0x80000000
259
260 #define elf_check_arch(x) ( (x) == EM_ARM )
261
262 #define ELF_CLASS ELFCLASS32
263 #ifdef TARGET_WORDS_BIGENDIAN
264 #define ELF_DATA ELFDATA2MSB
265 #else
266 #define ELF_DATA ELFDATA2LSB
267 #endif
268 #define ELF_ARCH EM_ARM
269
270 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
271 {
272 abi_long stack = infop->start_stack;
273 memset(regs, 0, sizeof(*regs));
274 regs->ARM_cpsr = 0x10;
275 if (infop->entry & 1)
276 regs->ARM_cpsr |= CPSR_T;
277 regs->ARM_pc = infop->entry & 0xfffffffe;
278 regs->ARM_sp = infop->start_stack;
279 /* FIXME - what to for failure of get_user()? */
280 get_user_ual(regs->ARM_r2, stack + 8); /* envp */
281 get_user_ual(regs->ARM_r1, stack + 4); /* envp */
282 /* XXX: it seems that r0 is zeroed after ! */
283 regs->ARM_r0 = 0;
284 /* For uClinux PIC binaries. */
285 /* XXX: Linux does this only on ARM with no MMU (do we care ?) */
286 regs->ARM_r10 = infop->start_data;
287 }
288
289 #define ELF_NREG 18
290 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
291
292 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUState *env)
293 {
294 (*regs)[0] = tswapl(env->regs[0]);
295 (*regs)[1] = tswapl(env->regs[1]);
296 (*regs)[2] = tswapl(env->regs[2]);
297 (*regs)[3] = tswapl(env->regs[3]);
298 (*regs)[4] = tswapl(env->regs[4]);
299 (*regs)[5] = tswapl(env->regs[5]);
300 (*regs)[6] = tswapl(env->regs[6]);
301 (*regs)[7] = tswapl(env->regs[7]);
302 (*regs)[8] = tswapl(env->regs[8]);
303 (*regs)[9] = tswapl(env->regs[9]);
304 (*regs)[10] = tswapl(env->regs[10]);
305 (*regs)[11] = tswapl(env->regs[11]);
306 (*regs)[12] = tswapl(env->regs[12]);
307 (*regs)[13] = tswapl(env->regs[13]);
308 (*regs)[14] = tswapl(env->regs[14]);
309 (*regs)[15] = tswapl(env->regs[15]);
310
311 (*regs)[16] = tswapl(cpsr_read((CPUState *)env));
312 (*regs)[17] = tswapl(env->regs[0]); /* XXX */
313 }
314
315 #define USE_ELF_CORE_DUMP
316 #define ELF_EXEC_PAGESIZE 4096
317
318 enum
319 {
320 ARM_HWCAP_ARM_SWP = 1 << 0,
321 ARM_HWCAP_ARM_HALF = 1 << 1,
322 ARM_HWCAP_ARM_THUMB = 1 << 2,
323 ARM_HWCAP_ARM_26BIT = 1 << 3,
324 ARM_HWCAP_ARM_FAST_MULT = 1 << 4,
325 ARM_HWCAP_ARM_FPA = 1 << 5,
326 ARM_HWCAP_ARM_VFP = 1 << 6,
327 ARM_HWCAP_ARM_EDSP = 1 << 7,
328 ARM_HWCAP_ARM_JAVA = 1 << 8,
329 ARM_HWCAP_ARM_IWMMXT = 1 << 9,
330 ARM_HWCAP_ARM_THUMBEE = 1 << 10,
331 ARM_HWCAP_ARM_NEON = 1 << 11,
332 ARM_HWCAP_ARM_VFPv3 = 1 << 12,
333 ARM_HWCAP_ARM_VFPv3D16 = 1 << 13,
334 };
335
336 #define ELF_HWCAP (ARM_HWCAP_ARM_SWP | ARM_HWCAP_ARM_HALF \
337 | ARM_HWCAP_ARM_THUMB | ARM_HWCAP_ARM_FAST_MULT \
338 | ARM_HWCAP_ARM_FPA | ARM_HWCAP_ARM_VFP \
339 | ARM_HWCAP_ARM_NEON | ARM_HWCAP_ARM_VFPv3 )
340
341 #endif
342
343 #ifdef TARGET_SPARC
344 #ifdef TARGET_SPARC64
345
346 #define ELF_START_MMAP 0x80000000
347
348 #ifndef TARGET_ABI32
349 #define elf_check_arch(x) ( (x) == EM_SPARCV9 || (x) == EM_SPARC32PLUS )
350 #else
351 #define elf_check_arch(x) ( (x) == EM_SPARC32PLUS || (x) == EM_SPARC )
352 #endif
353
354 #define ELF_CLASS ELFCLASS64
355 #define ELF_DATA ELFDATA2MSB
356 #define ELF_ARCH EM_SPARCV9
357
358 #define STACK_BIAS 2047
359
360 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
361 {
362 #ifndef TARGET_ABI32
363 regs->tstate = 0;
364 #endif
365 regs->pc = infop->entry;
366 regs->npc = regs->pc + 4;
367 regs->y = 0;
368 #ifdef TARGET_ABI32
369 regs->u_regs[14] = infop->start_stack - 16 * 4;
370 #else
371 if (personality(infop->personality) == PER_LINUX32)
372 regs->u_regs[14] = infop->start_stack - 16 * 4;
373 else
374 regs->u_regs[14] = infop->start_stack - 16 * 8 - STACK_BIAS;
375 #endif
376 }
377
378 #else
379 #define ELF_START_MMAP 0x80000000
380
381 #define elf_check_arch(x) ( (x) == EM_SPARC )
382
383 #define ELF_CLASS ELFCLASS32
384 #define ELF_DATA ELFDATA2MSB
385 #define ELF_ARCH EM_SPARC
386
387 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
388 {
389 regs->psr = 0;
390 regs->pc = infop->entry;
391 regs->npc = regs->pc + 4;
392 regs->y = 0;
393 regs->u_regs[14] = infop->start_stack - 16 * 4;
394 }
395
396 #endif
397 #endif
398
399 #ifdef TARGET_PPC
400
401 #define ELF_START_MMAP 0x80000000
402
403 #if defined(TARGET_PPC64) && !defined(TARGET_ABI32)
404
405 #define elf_check_arch(x) ( (x) == EM_PPC64 )
406
407 #define ELF_CLASS ELFCLASS64
408
409 #else
410
411 #define elf_check_arch(x) ( (x) == EM_PPC )
412
413 #define ELF_CLASS ELFCLASS32
414
415 #endif
416
417 #ifdef TARGET_WORDS_BIGENDIAN
418 #define ELF_DATA ELFDATA2MSB
419 #else
420 #define ELF_DATA ELFDATA2LSB
421 #endif
422 #define ELF_ARCH EM_PPC
423
424 /* Feature masks for the Aux Vector Hardware Capabilities (AT_HWCAP).
425 See arch/powerpc/include/asm/cputable.h. */
426 enum {
427 QEMU_PPC_FEATURE_32 = 0x80000000,
428 QEMU_PPC_FEATURE_64 = 0x40000000,
429 QEMU_PPC_FEATURE_601_INSTR = 0x20000000,
430 QEMU_PPC_FEATURE_HAS_ALTIVEC = 0x10000000,
431 QEMU_PPC_FEATURE_HAS_FPU = 0x08000000,
432 QEMU_PPC_FEATURE_HAS_MMU = 0x04000000,
433 QEMU_PPC_FEATURE_HAS_4xxMAC = 0x02000000,
434 QEMU_PPC_FEATURE_UNIFIED_CACHE = 0x01000000,
435 QEMU_PPC_FEATURE_HAS_SPE = 0x00800000,
436 QEMU_PPC_FEATURE_HAS_EFP_SINGLE = 0x00400000,
437 QEMU_PPC_FEATURE_HAS_EFP_DOUBLE = 0x00200000,
438 QEMU_PPC_FEATURE_NO_TB = 0x00100000,
439 QEMU_PPC_FEATURE_POWER4 = 0x00080000,
440 QEMU_PPC_FEATURE_POWER5 = 0x00040000,
441 QEMU_PPC_FEATURE_POWER5_PLUS = 0x00020000,
442 QEMU_PPC_FEATURE_CELL = 0x00010000,
443 QEMU_PPC_FEATURE_BOOKE = 0x00008000,
444 QEMU_PPC_FEATURE_SMT = 0x00004000,
445 QEMU_PPC_FEATURE_ICACHE_SNOOP = 0x00002000,
446 QEMU_PPC_FEATURE_ARCH_2_05 = 0x00001000,
447 QEMU_PPC_FEATURE_PA6T = 0x00000800,
448 QEMU_PPC_FEATURE_HAS_DFP = 0x00000400,
449 QEMU_PPC_FEATURE_POWER6_EXT = 0x00000200,
450 QEMU_PPC_FEATURE_ARCH_2_06 = 0x00000100,
451 QEMU_PPC_FEATURE_HAS_VSX = 0x00000080,
452 QEMU_PPC_FEATURE_PSERIES_PERFMON_COMPAT = 0x00000040,
453
454 QEMU_PPC_FEATURE_TRUE_LE = 0x00000002,
455 QEMU_PPC_FEATURE_PPC_LE = 0x00000001,
456 };
457
458 #define ELF_HWCAP get_elf_hwcap()
459
460 static uint32_t get_elf_hwcap(void)
461 {
462 CPUState *e = thread_env;
463 uint32_t features = 0;
464
465 /* We don't have to be terribly complete here; the high points are
466 Altivec/FP/SPE support. Anything else is just a bonus. */
467 #define GET_FEATURE(flag, feature) \
468 do {if (e->insns_flags & flag) features |= feature; } while(0)
469 GET_FEATURE(PPC_64B, QEMU_PPC_FEATURE_64);
470 GET_FEATURE(PPC_FLOAT, QEMU_PPC_FEATURE_HAS_FPU);
471 GET_FEATURE(PPC_ALTIVEC, QEMU_PPC_FEATURE_HAS_ALTIVEC);
472 GET_FEATURE(PPC_SPE, QEMU_PPC_FEATURE_HAS_SPE);
473 GET_FEATURE(PPC_SPE_SINGLE, QEMU_PPC_FEATURE_HAS_EFP_SINGLE);
474 GET_FEATURE(PPC_SPE_DOUBLE, QEMU_PPC_FEATURE_HAS_EFP_DOUBLE);
475 GET_FEATURE(PPC_BOOKE, QEMU_PPC_FEATURE_BOOKE);
476 GET_FEATURE(PPC_405_MAC, QEMU_PPC_FEATURE_HAS_4xxMAC);
477 #undef GET_FEATURE
478
479 return features;
480 }
481
482 /*
483 * We need to put in some extra aux table entries to tell glibc what
484 * the cache block size is, so it can use the dcbz instruction safely.
485 */
486 #define AT_DCACHEBSIZE 19
487 #define AT_ICACHEBSIZE 20
488 #define AT_UCACHEBSIZE 21
489 /* A special ignored type value for PPC, for glibc compatibility. */
490 #define AT_IGNOREPPC 22
491 /*
492 * The requirements here are:
493 * - keep the final alignment of sp (sp & 0xf)
494 * - make sure the 32-bit value at the first 16 byte aligned position of
495 * AUXV is greater than 16 for glibc compatibility.
496 * AT_IGNOREPPC is used for that.
497 * - for compatibility with glibc ARCH_DLINFO must always be defined on PPC,
498 * even if DLINFO_ARCH_ITEMS goes to zero or is undefined.
499 */
500 #define DLINFO_ARCH_ITEMS 5
501 #define ARCH_DLINFO \
502 do { \
503 NEW_AUX_ENT(AT_DCACHEBSIZE, 0x20); \
504 NEW_AUX_ENT(AT_ICACHEBSIZE, 0x20); \
505 NEW_AUX_ENT(AT_UCACHEBSIZE, 0); \
506 /* \
507 * Now handle glibc compatibility. \
508 */ \
509 NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \
510 NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \
511 } while (0)
512
513 static inline void init_thread(struct target_pt_regs *_regs, struct image_info *infop)
514 {
515 _regs->gpr[1] = infop->start_stack;
516 #if defined(TARGET_PPC64) && !defined(TARGET_ABI32)
517 _regs->gpr[2] = ldq_raw(infop->entry + 8) + infop->load_addr;
518 infop->entry = ldq_raw(infop->entry) + infop->load_addr;
519 #endif
520 _regs->nip = infop->entry;
521 }
522
523 /* See linux kernel: arch/powerpc/include/asm/elf.h. */
524 #define ELF_NREG 48
525 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
526
527 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUState *env)
528 {
529 int i;
530 target_ulong ccr = 0;
531
532 for (i = 0; i < ARRAY_SIZE(env->gpr); i++) {
533 (*regs)[i] = tswapl(env->gpr[i]);
534 }
535
536 (*regs)[32] = tswapl(env->nip);
537 (*regs)[33] = tswapl(env->msr);
538 (*regs)[35] = tswapl(env->ctr);
539 (*regs)[36] = tswapl(env->lr);
540 (*regs)[37] = tswapl(env->xer);
541
542 for (i = 0; i < ARRAY_SIZE(env->crf); i++) {
543 ccr |= env->crf[i] << (32 - ((i + 1) * 4));
544 }
545 (*regs)[38] = tswapl(ccr);
546 }
547
548 #define USE_ELF_CORE_DUMP
549 #define ELF_EXEC_PAGESIZE 4096
550
551 #endif
552
553 #ifdef TARGET_MIPS
554
555 #define ELF_START_MMAP 0x80000000
556
557 #define elf_check_arch(x) ( (x) == EM_MIPS )
558
559 #ifdef TARGET_MIPS64
560 #define ELF_CLASS ELFCLASS64
561 #else
562 #define ELF_CLASS ELFCLASS32
563 #endif
564 #ifdef TARGET_WORDS_BIGENDIAN
565 #define ELF_DATA ELFDATA2MSB
566 #else
567 #define ELF_DATA ELFDATA2LSB
568 #endif
569 #define ELF_ARCH EM_MIPS
570
571 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
572 {
573 regs->cp0_status = 2 << CP0St_KSU;
574 regs->cp0_epc = infop->entry;
575 regs->regs[29] = infop->start_stack;
576 }
577
578 /* See linux kernel: arch/mips/include/asm/elf.h. */
579 #define ELF_NREG 45
580 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
581
582 /* See linux kernel: arch/mips/include/asm/reg.h. */
583 enum {
584 #ifdef TARGET_MIPS64
585 TARGET_EF_R0 = 0,
586 #else
587 TARGET_EF_R0 = 6,
588 #endif
589 TARGET_EF_R26 = TARGET_EF_R0 + 26,
590 TARGET_EF_R27 = TARGET_EF_R0 + 27,
591 TARGET_EF_LO = TARGET_EF_R0 + 32,
592 TARGET_EF_HI = TARGET_EF_R0 + 33,
593 TARGET_EF_CP0_EPC = TARGET_EF_R0 + 34,
594 TARGET_EF_CP0_BADVADDR = TARGET_EF_R0 + 35,
595 TARGET_EF_CP0_STATUS = TARGET_EF_R0 + 36,
596 TARGET_EF_CP0_CAUSE = TARGET_EF_R0 + 37
597 };
598
599 /* See linux kernel: arch/mips/kernel/process.c:elf_dump_regs. */
600 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUState *env)
601 {
602 int i;
603
604 for (i = 0; i < TARGET_EF_R0; i++) {
605 (*regs)[i] = 0;
606 }
607 (*regs)[TARGET_EF_R0] = 0;
608
609 for (i = 1; i < ARRAY_SIZE(env->active_tc.gpr); i++) {
610 (*regs)[TARGET_EF_R0 + i] = tswapl(env->active_tc.gpr[i]);
611 }
612
613 (*regs)[TARGET_EF_R26] = 0;
614 (*regs)[TARGET_EF_R27] = 0;
615 (*regs)[TARGET_EF_LO] = tswapl(env->active_tc.LO[0]);
616 (*regs)[TARGET_EF_HI] = tswapl(env->active_tc.HI[0]);
617 (*regs)[TARGET_EF_CP0_EPC] = tswapl(env->active_tc.PC);
618 (*regs)[TARGET_EF_CP0_BADVADDR] = tswapl(env->CP0_BadVAddr);
619 (*regs)[TARGET_EF_CP0_STATUS] = tswapl(env->CP0_Status);
620 (*regs)[TARGET_EF_CP0_CAUSE] = tswapl(env->CP0_Cause);
621 }
622
623 #define USE_ELF_CORE_DUMP
624 #define ELF_EXEC_PAGESIZE 4096
625
626 #endif /* TARGET_MIPS */
627
628 #ifdef TARGET_MICROBLAZE
629
630 #define ELF_START_MMAP 0x80000000
631
632 #define elf_check_arch(x) ( (x) == EM_XILINX_MICROBLAZE )
633
634 #define ELF_CLASS ELFCLASS32
635 #define ELF_DATA ELFDATA2MSB
636 #define ELF_ARCH EM_XILINX_MICROBLAZE
637
638 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
639 {
640 regs->pc = infop->entry;
641 regs->r1 = infop->start_stack;
642
643 }
644
645 #define ELF_EXEC_PAGESIZE 4096
646
647 #endif /* TARGET_MICROBLAZE */
648
649 #ifdef TARGET_SH4
650
651 #define ELF_START_MMAP 0x80000000
652
653 #define elf_check_arch(x) ( (x) == EM_SH )
654
655 #define ELF_CLASS ELFCLASS32
656 #define ELF_DATA ELFDATA2LSB
657 #define ELF_ARCH EM_SH
658
659 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
660 {
661 /* Check other registers XXXXX */
662 regs->pc = infop->entry;
663 regs->regs[15] = infop->start_stack;
664 }
665
666 /* See linux kernel: arch/sh/include/asm/elf.h. */
667 #define ELF_NREG 23
668 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
669
670 /* See linux kernel: arch/sh/include/asm/ptrace.h. */
671 enum {
672 TARGET_REG_PC = 16,
673 TARGET_REG_PR = 17,
674 TARGET_REG_SR = 18,
675 TARGET_REG_GBR = 19,
676 TARGET_REG_MACH = 20,
677 TARGET_REG_MACL = 21,
678 TARGET_REG_SYSCALL = 22
679 };
680
681 static inline void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUState *env)
682 {
683 int i;
684
685 for (i = 0; i < 16; i++) {
686 (*regs[i]) = tswapl(env->gregs[i]);
687 }
688
689 (*regs)[TARGET_REG_PC] = tswapl(env->pc);
690 (*regs)[TARGET_REG_PR] = tswapl(env->pr);
691 (*regs)[TARGET_REG_SR] = tswapl(env->sr);
692 (*regs)[TARGET_REG_GBR] = tswapl(env->gbr);
693 (*regs)[TARGET_REG_MACH] = tswapl(env->mach);
694 (*regs)[TARGET_REG_MACL] = tswapl(env->macl);
695 (*regs)[TARGET_REG_SYSCALL] = 0; /* FIXME */
696 }
697
698 #define USE_ELF_CORE_DUMP
699 #define ELF_EXEC_PAGESIZE 4096
700
701 #endif
702
703 #ifdef TARGET_CRIS
704
705 #define ELF_START_MMAP 0x80000000
706
707 #define elf_check_arch(x) ( (x) == EM_CRIS )
708
709 #define ELF_CLASS ELFCLASS32
710 #define ELF_DATA ELFDATA2LSB
711 #define ELF_ARCH EM_CRIS
712
713 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
714 {
715 regs->erp = infop->entry;
716 }
717
718 #define ELF_EXEC_PAGESIZE 8192
719
720 #endif
721
722 #ifdef TARGET_M68K
723
724 #define ELF_START_MMAP 0x80000000
725
726 #define elf_check_arch(x) ( (x) == EM_68K )
727
728 #define ELF_CLASS ELFCLASS32
729 #define ELF_DATA ELFDATA2MSB
730 #define ELF_ARCH EM_68K
731
732 /* ??? Does this need to do anything?
733 #define ELF_PLAT_INIT(_r) */
734
735 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
736 {
737 regs->usp = infop->start_stack;
738 regs->sr = 0;
739 regs->pc = infop->entry;
740 }
741
742 /* See linux kernel: arch/m68k/include/asm/elf.h. */
743 #define ELF_NREG 20
744 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
745
746 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUState *env)
747 {
748 (*regs)[0] = tswapl(env->dregs[1]);
749 (*regs)[1] = tswapl(env->dregs[2]);
750 (*regs)[2] = tswapl(env->dregs[3]);
751 (*regs)[3] = tswapl(env->dregs[4]);
752 (*regs)[4] = tswapl(env->dregs[5]);
753 (*regs)[5] = tswapl(env->dregs[6]);
754 (*regs)[6] = tswapl(env->dregs[7]);
755 (*regs)[7] = tswapl(env->aregs[0]);
756 (*regs)[8] = tswapl(env->aregs[1]);
757 (*regs)[9] = tswapl(env->aregs[2]);
758 (*regs)[10] = tswapl(env->aregs[3]);
759 (*regs)[11] = tswapl(env->aregs[4]);
760 (*regs)[12] = tswapl(env->aregs[5]);
761 (*regs)[13] = tswapl(env->aregs[6]);
762 (*regs)[14] = tswapl(env->dregs[0]);
763 (*regs)[15] = tswapl(env->aregs[7]);
764 (*regs)[16] = tswapl(env->dregs[0]); /* FIXME: orig_d0 */
765 (*regs)[17] = tswapl(env->sr);
766 (*regs)[18] = tswapl(env->pc);
767 (*regs)[19] = 0; /* FIXME: regs->format | regs->vector */
768 }
769
770 #define USE_ELF_CORE_DUMP
771 #define ELF_EXEC_PAGESIZE 8192
772
773 #endif
774
775 #ifdef TARGET_ALPHA
776
777 #define ELF_START_MMAP (0x30000000000ULL)
778
779 #define elf_check_arch(x) ( (x) == ELF_ARCH )
780
781 #define ELF_CLASS ELFCLASS64
782 #define ELF_DATA ELFDATA2MSB
783 #define ELF_ARCH EM_ALPHA
784
785 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
786 {
787 regs->pc = infop->entry;
788 regs->ps = 8;
789 regs->usp = infop->start_stack;
790 }
791
792 #define ELF_EXEC_PAGESIZE 8192
793
794 #endif /* TARGET_ALPHA */
795
796 #ifndef ELF_PLATFORM
797 #define ELF_PLATFORM (NULL)
798 #endif
799
800 #ifndef ELF_HWCAP
801 #define ELF_HWCAP 0
802 #endif
803
804 #ifdef TARGET_ABI32
805 #undef ELF_CLASS
806 #define ELF_CLASS ELFCLASS32
807 #undef bswaptls
808 #define bswaptls(ptr) bswap32s(ptr)
809 #endif
810
811 #include "elf.h"
812
813 struct exec
814 {
815 unsigned int a_info; /* Use macros N_MAGIC, etc for access */
816 unsigned int a_text; /* length of text, in bytes */
817 unsigned int a_data; /* length of data, in bytes */
818 unsigned int a_bss; /* length of uninitialized data area, in bytes */
819 unsigned int a_syms; /* length of symbol table data in file, in bytes */
820 unsigned int a_entry; /* start address */
821 unsigned int a_trsize; /* length of relocation info for text, in bytes */
822 unsigned int a_drsize; /* length of relocation info for data, in bytes */
823 };
824
825
826 #define N_MAGIC(exec) ((exec).a_info & 0xffff)
827 #define OMAGIC 0407
828 #define NMAGIC 0410
829 #define ZMAGIC 0413
830 #define QMAGIC 0314
831
832 /* max code+data+bss space allocated to elf interpreter */
833 #define INTERP_MAP_SIZE (32 * 1024 * 1024)
834
835 /* max code+data+bss+brk space allocated to ET_DYN executables */
836 #define ET_DYN_MAP_SIZE (128 * 1024 * 1024)
837
838 /* Necessary parameters */
839 #define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE
840 #define TARGET_ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE-1))
841 #define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE-1))
842
843 #define INTERPRETER_NONE 0
844 #define INTERPRETER_AOUT 1
845 #define INTERPRETER_ELF 2
846
847 #define DLINFO_ITEMS 12
848
849 static inline void memcpy_fromfs(void * to, const void * from, unsigned long n)
850 {
851 memcpy(to, from, n);
852 }
853
854 static int load_aout_interp(void * exptr, int interp_fd);
855
856 #ifdef BSWAP_NEEDED
857 static void bswap_ehdr(struct elfhdr *ehdr)
858 {
859 bswap16s(&ehdr->e_type); /* Object file type */
860 bswap16s(&ehdr->e_machine); /* Architecture */
861 bswap32s(&ehdr->e_version); /* Object file version */
862 bswaptls(&ehdr->e_entry); /* Entry point virtual address */
863 bswaptls(&ehdr->e_phoff); /* Program header table file offset */
864 bswaptls(&ehdr->e_shoff); /* Section header table file offset */
865 bswap32s(&ehdr->e_flags); /* Processor-specific flags */
866 bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */
867 bswap16s(&ehdr->e_phentsize); /* Program header table entry size */
868 bswap16s(&ehdr->e_phnum); /* Program header table entry count */
869 bswap16s(&ehdr->e_shentsize); /* Section header table entry size */
870 bswap16s(&ehdr->e_shnum); /* Section header table entry count */
871 bswap16s(&ehdr->e_shstrndx); /* Section header string table index */
872 }
873
874 static void bswap_phdr(struct elf_phdr *phdr)
875 {
876 bswap32s(&phdr->p_type); /* Segment type */
877 bswaptls(&phdr->p_offset); /* Segment file offset */
878 bswaptls(&phdr->p_vaddr); /* Segment virtual address */
879 bswaptls(&phdr->p_paddr); /* Segment physical address */
880 bswaptls(&phdr->p_filesz); /* Segment size in file */
881 bswaptls(&phdr->p_memsz); /* Segment size in memory */
882 bswap32s(&phdr->p_flags); /* Segment flags */
883 bswaptls(&phdr->p_align); /* Segment alignment */
884 }
885
886 static void bswap_shdr(struct elf_shdr *shdr)
887 {
888 bswap32s(&shdr->sh_name);
889 bswap32s(&shdr->sh_type);
890 bswaptls(&shdr->sh_flags);
891 bswaptls(&shdr->sh_addr);
892 bswaptls(&shdr->sh_offset);
893 bswaptls(&shdr->sh_size);
894 bswap32s(&shdr->sh_link);
895 bswap32s(&shdr->sh_info);
896 bswaptls(&shdr->sh_addralign);
897 bswaptls(&shdr->sh_entsize);
898 }
899
900 static void bswap_sym(struct elf_sym *sym)
901 {
902 bswap32s(&sym->st_name);
903 bswaptls(&sym->st_value);
904 bswaptls(&sym->st_size);
905 bswap16s(&sym->st_shndx);
906 }
907 #endif
908
909 #ifdef USE_ELF_CORE_DUMP
910 static int elf_core_dump(int, const CPUState *);
911
912 #ifdef BSWAP_NEEDED
913 static void bswap_note(struct elf_note *en)
914 {
915 bswap32s(&en->n_namesz);
916 bswap32s(&en->n_descsz);
917 bswap32s(&en->n_type);
918 }
919 #endif /* BSWAP_NEEDED */
920
921 #endif /* USE_ELF_CORE_DUMP */
922
923 /*
924 * 'copy_elf_strings()' copies argument/envelope strings from user
925 * memory to free pages in kernel mem. These are in a format ready
926 * to be put directly into the top of new user memory.
927 *
928 */
929 static abi_ulong copy_elf_strings(int argc,char ** argv, void **page,
930 abi_ulong p)
931 {
932 char *tmp, *tmp1, *pag = NULL;
933 int len, offset = 0;
934
935 if (!p) {
936 return 0; /* bullet-proofing */
937 }
938 while (argc-- > 0) {
939 tmp = argv[argc];
940 if (!tmp) {
941 fprintf(stderr, "VFS: argc is wrong");
942 exit(-1);
943 }
944 tmp1 = tmp;
945 while (*tmp++);
946 len = tmp - tmp1;
947 if (p < len) { /* this shouldn't happen - 128kB */
948 return 0;
949 }
950 while (len) {
951 --p; --tmp; --len;
952 if (--offset < 0) {
953 offset = p % TARGET_PAGE_SIZE;
954 pag = (char *)page[p/TARGET_PAGE_SIZE];
955 if (!pag) {
956 pag = (char *)malloc(TARGET_PAGE_SIZE);
957 memset(pag, 0, TARGET_PAGE_SIZE);
958 page[p/TARGET_PAGE_SIZE] = pag;
959 if (!pag)
960 return 0;
961 }
962 }
963 if (len == 0 || offset == 0) {
964 *(pag + offset) = *tmp;
965 }
966 else {
967 int bytes_to_copy = (len > offset) ? offset : len;
968 tmp -= bytes_to_copy;
969 p -= bytes_to_copy;
970 offset -= bytes_to_copy;
971 len -= bytes_to_copy;
972 memcpy_fromfs(pag + offset, tmp, bytes_to_copy + 1);
973 }
974 }
975 }
976 return p;
977 }
978
979 static abi_ulong setup_arg_pages(abi_ulong p, struct linux_binprm *bprm,
980 struct image_info *info)
981 {
982 abi_ulong stack_base, size, error;
983 int i;
984
985 /* Create enough stack to hold everything. If we don't use
986 * it for args, we'll use it for something else...
987 */
988 size = guest_stack_size;
989 if (size < MAX_ARG_PAGES*TARGET_PAGE_SIZE)
990 size = MAX_ARG_PAGES*TARGET_PAGE_SIZE;
991 error = target_mmap(0,
992 size + qemu_host_page_size,
993 PROT_READ | PROT_WRITE,
994 MAP_PRIVATE | MAP_ANONYMOUS,
995 -1, 0);
996 if (error == -1) {
997 perror("stk mmap");
998 exit(-1);
999 }
1000 /* we reserve one extra page at the top of the stack as guard */
1001 target_mprotect(error + size, qemu_host_page_size, PROT_NONE);
1002
1003 stack_base = error + size - MAX_ARG_PAGES*TARGET_PAGE_SIZE;
1004 p += stack_base;
1005
1006 for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
1007 if (bprm->page[i]) {
1008 info->rss++;
1009 /* FIXME - check return value of memcpy_to_target() for failure */
1010 memcpy_to_target(stack_base, bprm->page[i], TARGET_PAGE_SIZE);
1011 free(bprm->page[i]);
1012 }
1013 stack_base += TARGET_PAGE_SIZE;
1014 }
1015 return p;
1016 }
1017
1018 static void set_brk(abi_ulong start, abi_ulong end)
1019 {
1020 /* page-align the start and end addresses... */
1021 start = HOST_PAGE_ALIGN(start);
1022 end = HOST_PAGE_ALIGN(end);
1023 if (end <= start)
1024 return;
1025 if(target_mmap(start, end - start,
1026 PROT_READ | PROT_WRITE | PROT_EXEC,
1027 MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0) == -1) {
1028 perror("cannot mmap brk");
1029 exit(-1);
1030 }
1031 }
1032
1033
1034 /* We need to explicitly zero any fractional pages after the data
1035 section (i.e. bss). This would contain the junk from the file that
1036 should not be in memory. */
1037 static void padzero(abi_ulong elf_bss, abi_ulong last_bss)
1038 {
1039 abi_ulong nbyte;
1040
1041 if (elf_bss >= last_bss)
1042 return;
1043
1044 /* XXX: this is really a hack : if the real host page size is
1045 smaller than the target page size, some pages after the end
1046 of the file may not be mapped. A better fix would be to
1047 patch target_mmap(), but it is more complicated as the file
1048 size must be known */
1049 if (qemu_real_host_page_size < qemu_host_page_size) {
1050 abi_ulong end_addr, end_addr1;
1051 end_addr1 = (elf_bss + qemu_real_host_page_size - 1) &
1052 ~(qemu_real_host_page_size - 1);
1053 end_addr = HOST_PAGE_ALIGN(elf_bss);
1054 if (end_addr1 < end_addr) {
1055 mmap((void *)g2h(end_addr1), end_addr - end_addr1,
1056 PROT_READ|PROT_WRITE|PROT_EXEC,
1057 MAP_FIXED|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1058 }
1059 }
1060
1061 nbyte = elf_bss & (qemu_host_page_size-1);
1062 if (nbyte) {
1063 nbyte = qemu_host_page_size - nbyte;
1064 do {
1065 /* FIXME - what to do if put_user() fails? */
1066 put_user_u8(0, elf_bss);
1067 elf_bss++;
1068 } while (--nbyte);
1069 }
1070 }
1071
1072
1073 static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
1074 struct elfhdr * exec,
1075 abi_ulong load_addr,
1076 abi_ulong load_bias,
1077 abi_ulong interp_load_addr, int ibcs,
1078 struct image_info *info)
1079 {
1080 abi_ulong sp;
1081 int size;
1082 abi_ulong u_platform;
1083 const char *k_platform;
1084 const int n = sizeof(elf_addr_t);
1085
1086 sp = p;
1087 u_platform = 0;
1088 k_platform = ELF_PLATFORM;
1089 if (k_platform) {
1090 size_t len = strlen(k_platform) + 1;
1091 sp -= (len + n - 1) & ~(n - 1);
1092 u_platform = sp;
1093 /* FIXME - check return value of memcpy_to_target() for failure */
1094 memcpy_to_target(sp, k_platform, len);
1095 }
1096 /*
1097 * Force 16 byte _final_ alignment here for generality.
1098 */
1099 sp = sp &~ (abi_ulong)15;
1100 size = (DLINFO_ITEMS + 1) * 2;
1101 if (k_platform)
1102 size += 2;
1103 #ifdef DLINFO_ARCH_ITEMS
1104 size += DLINFO_ARCH_ITEMS * 2;
1105 #endif
1106 size += envc + argc + 2;
1107 size += (!ibcs ? 3 : 1); /* argc itself */
1108 size *= n;
1109 if (size & 15)
1110 sp -= 16 - (size & 15);
1111
1112 /* This is correct because Linux defines
1113 * elf_addr_t as Elf32_Off / Elf64_Off
1114 */
1115 #define NEW_AUX_ENT(id, val) do { \
1116 sp -= n; put_user_ual(val, sp); \
1117 sp -= n; put_user_ual(id, sp); \
1118 } while(0)
1119
1120 NEW_AUX_ENT (AT_NULL, 0);
1121
1122 /* There must be exactly DLINFO_ITEMS entries here. */
1123 NEW_AUX_ENT(AT_PHDR, (abi_ulong)(load_addr + exec->e_phoff));
1124 NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof (struct elf_phdr)));
1125 NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum));
1126 NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(TARGET_PAGE_SIZE));
1127 NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_load_addr));
1128 NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0);
1129 NEW_AUX_ENT(AT_ENTRY, load_bias + exec->e_entry);
1130 NEW_AUX_ENT(AT_UID, (abi_ulong) getuid());
1131 NEW_AUX_ENT(AT_EUID, (abi_ulong) geteuid());
1132 NEW_AUX_ENT(AT_GID, (abi_ulong) getgid());
1133 NEW_AUX_ENT(AT_EGID, (abi_ulong) getegid());
1134 NEW_AUX_ENT(AT_HWCAP, (abi_ulong) ELF_HWCAP);
1135 NEW_AUX_ENT(AT_CLKTCK, (abi_ulong) sysconf(_SC_CLK_TCK));
1136 if (k_platform)
1137 NEW_AUX_ENT(AT_PLATFORM, u_platform);
1138 #ifdef ARCH_DLINFO
1139 /*
1140 * ARCH_DLINFO must come last so platform specific code can enforce
1141 * special alignment requirements on the AUXV if necessary (eg. PPC).
1142 */
1143 ARCH_DLINFO;
1144 #endif
1145 #undef NEW_AUX_ENT
1146
1147 info->saved_auxv = sp;
1148
1149 sp = loader_build_argptr(envc, argc, sp, p, !ibcs);
1150 return sp;
1151 }
1152
1153
1154 static abi_ulong load_elf_interp(struct elfhdr * interp_elf_ex,
1155 int interpreter_fd,
1156 abi_ulong *interp_load_addr)
1157 {
1158 struct elf_phdr *elf_phdata = NULL;
1159 struct elf_phdr *eppnt;
1160 abi_ulong load_addr = 0;
1161 int load_addr_set = 0;
1162 int retval;
1163 abi_ulong last_bss, elf_bss;
1164 abi_ulong error;
1165 int i;
1166
1167 elf_bss = 0;
1168 last_bss = 0;
1169 error = 0;
1170
1171 #ifdef BSWAP_NEEDED
1172 bswap_ehdr(interp_elf_ex);
1173 #endif
1174 /* First of all, some simple consistency checks */
1175 if ((interp_elf_ex->e_type != ET_EXEC &&
1176 interp_elf_ex->e_type != ET_DYN) ||
1177 !elf_check_arch(interp_elf_ex->e_machine)) {
1178 return ~((abi_ulong)0UL);
1179 }
1180
1181
1182 /* Now read in all of the header information */
1183
1184 if (sizeof(struct elf_phdr) * interp_elf_ex->e_phnum > TARGET_PAGE_SIZE)
1185 return ~(abi_ulong)0UL;
1186
1187 elf_phdata = (struct elf_phdr *)
1188 malloc(sizeof(struct elf_phdr) * interp_elf_ex->e_phnum);
1189
1190 if (!elf_phdata)
1191 return ~((abi_ulong)0UL);
1192
1193 /*
1194 * If the size of this structure has changed, then punt, since
1195 * we will be doing the wrong thing.
1196 */
1197 if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr)) {
1198 free(elf_phdata);
1199 return ~((abi_ulong)0UL);
1200 }
1201
1202 retval = lseek(interpreter_fd, interp_elf_ex->e_phoff, SEEK_SET);
1203 if(retval >= 0) {
1204 retval = read(interpreter_fd,
1205 (char *) elf_phdata,
1206 sizeof(struct elf_phdr) * interp_elf_ex->e_phnum);
1207 }
1208 if (retval < 0) {
1209 perror("load_elf_interp");
1210 exit(-1);
1211 free (elf_phdata);
1212 return retval;
1213 }
1214 #ifdef BSWAP_NEEDED
1215 eppnt = elf_phdata;
1216 for (i=0; i<interp_elf_ex->e_phnum; i++, eppnt++) {
1217 bswap_phdr(eppnt);
1218 }
1219 #endif
1220
1221 if (interp_elf_ex->e_type == ET_DYN) {
1222 /* in order to avoid hardcoding the interpreter load
1223 address in qemu, we allocate a big enough memory zone */
1224 error = target_mmap(0, INTERP_MAP_SIZE,
1225 PROT_NONE, MAP_PRIVATE | MAP_ANON,
1226 -1, 0);
1227 if (error == -1) {
1228 perror("mmap");
1229 exit(-1);
1230 }
1231 load_addr = error;
1232 load_addr_set = 1;
1233 }
1234
1235 eppnt = elf_phdata;
1236 for(i=0; i<interp_elf_ex->e_phnum; i++, eppnt++)
1237 if (eppnt->p_type == PT_LOAD) {
1238 int elf_type = MAP_PRIVATE | MAP_DENYWRITE;
1239 int elf_prot = 0;
1240 abi_ulong vaddr = 0;
1241 abi_ulong k;
1242
1243 if (eppnt->p_flags & PF_R) elf_prot = PROT_READ;
1244 if (eppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
1245 if (eppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
1246 if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) {
1247 elf_type |= MAP_FIXED;
1248 vaddr = eppnt->p_vaddr;
1249 }
1250 error = target_mmap(load_addr+TARGET_ELF_PAGESTART(vaddr),
1251 eppnt->p_filesz + TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr),
1252 elf_prot,
1253 elf_type,
1254 interpreter_fd,
1255 eppnt->p_offset - TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr));
1256
1257 if (error == -1) {
1258 /* Real error */
1259 close(interpreter_fd);
1260 free(elf_phdata);
1261 return ~((abi_ulong)0UL);
1262 }
1263
1264 if (!load_addr_set && interp_elf_ex->e_type == ET_DYN) {
1265 load_addr = error;
1266 load_addr_set = 1;
1267 }
1268
1269 /*
1270 * Find the end of the file mapping for this phdr, and keep
1271 * track of the largest address we see for this.
1272 */
1273 k = load_addr + eppnt->p_vaddr + eppnt->p_filesz;
1274 if (k > elf_bss) elf_bss = k;
1275
1276 /*
1277 * Do the same thing for the memory mapping - between
1278 * elf_bss and last_bss is the bss section.
1279 */
1280 k = load_addr + eppnt->p_memsz + eppnt->p_vaddr;
1281 if (k > last_bss) last_bss = k;
1282 }
1283
1284 /* Now use mmap to map the library into memory. */
1285
1286 close(interpreter_fd);
1287
1288 /*
1289 * Now fill out the bss section. First pad the last page up
1290 * to the page boundary, and then perform a mmap to make sure
1291 * that there are zeromapped pages up to and including the last
1292 * bss page.
1293 */
1294 padzero(elf_bss, last_bss);
1295 elf_bss = TARGET_ELF_PAGESTART(elf_bss + qemu_host_page_size - 1); /* What we have mapped so far */
1296
1297 /* Map the last of the bss segment */
1298 if (last_bss > elf_bss) {
1299 target_mmap(elf_bss, last_bss-elf_bss,
1300 PROT_READ|PROT_WRITE|PROT_EXEC,
1301 MAP_FIXED|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
1302 }
1303 free(elf_phdata);
1304
1305 *interp_load_addr = load_addr;
1306 return ((abi_ulong) interp_elf_ex->e_entry) + load_addr;
1307 }
1308
1309 static int symfind(const void *s0, const void *s1)
1310 {
1311 struct elf_sym *key = (struct elf_sym *)s0;
1312 struct elf_sym *sym = (struct elf_sym *)s1;
1313 int result = 0;
1314 if (key->st_value < sym->st_value) {
1315 result = -1;
1316 } else if (key->st_value >= sym->st_value + sym->st_size) {
1317 result = 1;
1318 }
1319 return result;
1320 }
1321
1322 static const char *lookup_symbolxx(struct syminfo *s, target_ulong orig_addr)
1323 {
1324 #if ELF_CLASS == ELFCLASS32
1325 struct elf_sym *syms = s->disas_symtab.elf32;
1326 #else
1327 struct elf_sym *syms = s->disas_symtab.elf64;
1328 #endif
1329
1330 // binary search
1331 struct elf_sym key;
1332 struct elf_sym *sym;
1333
1334 key.st_value = orig_addr;
1335
1336 sym = bsearch(&key, syms, s->disas_num_syms, sizeof(*syms), symfind);
1337 if (sym != NULL) {
1338 return s->disas_strtab + sym->st_name;
1339 }
1340
1341 return "";
1342 }
1343
1344 /* FIXME: This should use elf_ops.h */
1345 static int symcmp(const void *s0, const void *s1)
1346 {
1347 struct elf_sym *sym0 = (struct elf_sym *)s0;
1348 struct elf_sym *sym1 = (struct elf_sym *)s1;
1349 return (sym0->st_value < sym1->st_value)
1350 ? -1
1351 : ((sym0->st_value > sym1->st_value) ? 1 : 0);
1352 }
1353
1354 /* Best attempt to load symbols from this ELF object. */
1355 static void load_symbols(struct elfhdr *hdr, int fd)
1356 {
1357 unsigned int i, nsyms;
1358 struct elf_shdr sechdr, symtab, strtab;
1359 char *strings;
1360 struct syminfo *s;
1361 struct elf_sym *syms;
1362
1363 lseek(fd, hdr->e_shoff, SEEK_SET);
1364 for (i = 0; i < hdr->e_shnum; i++) {
1365 if (read(fd, &sechdr, sizeof(sechdr)) != sizeof(sechdr))
1366 return;
1367 #ifdef BSWAP_NEEDED
1368 bswap_shdr(&sechdr);
1369 #endif
1370 if (sechdr.sh_type == SHT_SYMTAB) {
1371 symtab = sechdr;
1372 lseek(fd, hdr->e_shoff
1373 + sizeof(sechdr) * sechdr.sh_link, SEEK_SET);
1374 if (read(fd, &strtab, sizeof(strtab))
1375 != sizeof(strtab))
1376 return;
1377 #ifdef BSWAP_NEEDED
1378 bswap_shdr(&strtab);
1379 #endif
1380 goto found;
1381 }
1382 }
1383 return; /* Shouldn't happen... */
1384
1385 found:
1386 /* Now know where the strtab and symtab are. Snarf them. */
1387 s = malloc(sizeof(*s));
1388 syms = malloc(symtab.sh_size);
1389 if (!syms)
1390 return;
1391 s->disas_strtab = strings = malloc(strtab.sh_size);
1392 if (!s->disas_strtab)
1393 return;
1394
1395 lseek(fd, symtab.sh_offset, SEEK_SET);
1396 if (read(fd, syms, symtab.sh_size) != symtab.sh_size)
1397 return;
1398
1399 nsyms = symtab.sh_size / sizeof(struct elf_sym);
1400
1401 i = 0;
1402 while (i < nsyms) {
1403 #ifdef BSWAP_NEEDED
1404 bswap_sym(syms + i);
1405 #endif
1406 // Throw away entries which we do not need.
1407 if (syms[i].st_shndx == SHN_UNDEF ||
1408 syms[i].st_shndx >= SHN_LORESERVE ||
1409 ELF_ST_TYPE(syms[i].st_info) != STT_FUNC) {
1410 nsyms--;
1411 if (i < nsyms) {
1412 syms[i] = syms[nsyms];
1413 }
1414 continue;
1415 }
1416 #if defined(TARGET_ARM) || defined (TARGET_MIPS)
1417 /* The bottom address bit marks a Thumb or MIPS16 symbol. */
1418 syms[i].st_value &= ~(target_ulong)1;
1419 #endif
1420 i++;
1421 }
1422 syms = realloc(syms, nsyms * sizeof(*syms));
1423
1424 qsort(syms, nsyms, sizeof(*syms), symcmp);
1425
1426 lseek(fd, strtab.sh_offset, SEEK_SET);
1427 if (read(fd, strings, strtab.sh_size) != strtab.sh_size)
1428 return;
1429 s->disas_num_syms = nsyms;
1430 #if ELF_CLASS == ELFCLASS32
1431 s->disas_symtab.elf32 = syms;
1432 s->lookup_symbol = lookup_symbolxx;
1433 #else
1434 s->disas_symtab.elf64 = syms;
1435 s->lookup_symbol = lookup_symbolxx;
1436 #endif
1437 s->next = syminfos;
1438 syminfos = s;
1439 }
1440
1441 int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
1442 struct image_info * info)
1443 {
1444 struct elfhdr elf_ex;
1445 struct elfhdr interp_elf_ex;
1446 struct exec interp_ex;
1447 int interpreter_fd = -1; /* avoid warning */
1448 abi_ulong load_addr, load_bias;
1449 int load_addr_set = 0;
1450 unsigned int interpreter_type = INTERPRETER_NONE;
1451 unsigned char ibcs2_interpreter;
1452 int i;
1453 abi_ulong mapped_addr;
1454 struct elf_phdr * elf_ppnt;
1455 struct elf_phdr *elf_phdata;
1456 abi_ulong elf_bss, k, elf_brk;
1457 int retval;
1458 char * elf_interpreter;
1459 abi_ulong elf_entry, interp_load_addr = 0;
1460 int status;
1461 abi_ulong start_code, end_code, start_data, end_data;
1462 abi_ulong reloc_func_desc = 0;
1463 abi_ulong elf_stack;
1464 char passed_fileno[6];
1465
1466 ibcs2_interpreter = 0;
1467 status = 0;
1468 load_addr = 0;
1469 load_bias = 0;
1470 elf_ex = *((struct elfhdr *) bprm->buf); /* exec-header */
1471 #ifdef BSWAP_NEEDED
1472 bswap_ehdr(&elf_ex);
1473 #endif
1474
1475 /* First of all, some simple consistency checks */
1476 if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) ||
1477 (! elf_check_arch(elf_ex.e_machine))) {
1478 return -ENOEXEC;
1479 }
1480
1481 bprm->p = copy_elf_strings(1, &bprm->filename, bprm->page, bprm->p);
1482 bprm->p = copy_elf_strings(bprm->envc,bprm->envp,bprm->page,bprm->p);
1483 bprm->p = copy_elf_strings(bprm->argc,bprm->argv,bprm->page,bprm->p);
1484 if (!bprm->p) {
1485 retval = -E2BIG;
1486 }
1487
1488 /* Now read in all of the header information */
1489 elf_phdata = (struct elf_phdr *)malloc(elf_ex.e_phentsize*elf_ex.e_phnum);
1490 if (elf_phdata == NULL) {
1491 return -ENOMEM;
1492 }
1493
1494 retval = lseek(bprm->fd, elf_ex.e_phoff, SEEK_SET);
1495 if(retval > 0) {
1496 retval = read(bprm->fd, (char *) elf_phdata,
1497 elf_ex.e_phentsize * elf_ex.e_phnum);
1498 }
1499
1500 if (retval < 0) {
1501 perror("load_elf_binary");
1502 exit(-1);
1503 free (elf_phdata);
1504 return -errno;
1505 }
1506
1507 #ifdef BSWAP_NEEDED
1508 elf_ppnt = elf_phdata;
1509 for (i=0; i<elf_ex.e_phnum; i++, elf_ppnt++) {
1510 bswap_phdr(elf_ppnt);
1511 }
1512 #endif
1513 elf_ppnt = elf_phdata;
1514
1515 elf_bss = 0;
1516 elf_brk = 0;
1517
1518
1519 elf_stack = ~((abi_ulong)0UL);
1520 elf_interpreter = NULL;
1521 start_code = ~((abi_ulong)0UL);
1522 end_code = 0;
1523 start_data = 0;
1524 end_data = 0;
1525 interp_ex.a_info = 0;
1526
1527 for(i=0;i < elf_ex.e_phnum; i++) {
1528 if (elf_ppnt->p_type == PT_INTERP) {
1529 if ( elf_interpreter != NULL )
1530 {
1531 free (elf_phdata);
1532 free(elf_interpreter);
1533 close(bprm->fd);
1534 return -EINVAL;
1535 }
1536
1537 /* This is the program interpreter used for
1538 * shared libraries - for now assume that this
1539 * is an a.out format binary
1540 */
1541
1542 elf_interpreter = (char *)malloc(elf_ppnt->p_filesz);
1543
1544 if (elf_interpreter == NULL) {
1545 free (elf_phdata);
1546 close(bprm->fd);
1547 return -ENOMEM;
1548 }
1549
1550 retval = lseek(bprm->fd, elf_ppnt->p_offset, SEEK_SET);
1551 if(retval >= 0) {
1552 retval = read(bprm->fd, elf_interpreter, elf_ppnt->p_filesz);
1553 }
1554 if(retval < 0) {
1555 perror("load_elf_binary2");
1556 exit(-1);
1557 }
1558
1559 /* If the program interpreter is one of these two,
1560 then assume an iBCS2 image. Otherwise assume
1561 a native linux image. */
1562
1563 /* JRP - Need to add X86 lib dir stuff here... */
1564
1565 if (strcmp(elf_interpreter,"/usr/lib/libc.so.1") == 0 ||
1566 strcmp(elf_interpreter,"/usr/lib/ld.so.1") == 0) {
1567 ibcs2_interpreter = 1;
1568 }
1569
1570 #if 0
1571 printf("Using ELF interpreter %s\n", path(elf_interpreter));
1572 #endif
1573 if (retval >= 0) {
1574 retval = open(path(elf_interpreter), O_RDONLY);
1575 if(retval >= 0) {
1576 interpreter_fd = retval;
1577 }
1578 else {
1579 perror(elf_interpreter);
1580 exit(-1);
1581 /* retval = -errno; */
1582 }
1583 }
1584
1585 if (retval >= 0) {
1586 retval = lseek(interpreter_fd, 0, SEEK_SET);
1587 if(retval >= 0) {
1588 retval = read(interpreter_fd,bprm->buf,128);
1589 }
1590 }
1591 if (retval >= 0) {
1592 interp_ex = *((struct exec *) bprm->buf); /* aout exec-header */
1593 interp_elf_ex = *((struct elfhdr *) bprm->buf); /* elf exec-header */
1594 }
1595 if (retval < 0) {
1596 perror("load_elf_binary3");
1597 exit(-1);
1598 free (elf_phdata);
1599 free(elf_interpreter);
1600 close(bprm->fd);
1601 return retval;
1602 }
1603 }
1604 elf_ppnt++;
1605 }
1606
1607 /* Some simple consistency checks for the interpreter */
1608 if (elf_interpreter){
1609 interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT;
1610
1611 /* Now figure out which format our binary is */
1612 if ((N_MAGIC(interp_ex) != OMAGIC) && (N_MAGIC(interp_ex) != ZMAGIC) &&
1613 (N_MAGIC(interp_ex) != QMAGIC)) {
1614 interpreter_type = INTERPRETER_ELF;
1615 }
1616
1617 if (interp_elf_ex.e_ident[0] != 0x7f ||
1618 strncmp((char *)&interp_elf_ex.e_ident[1], "ELF",3) != 0) {
1619 interpreter_type &= ~INTERPRETER_ELF;
1620 }
1621
1622 if (!interpreter_type) {
1623 free(elf_interpreter);
1624 free(elf_phdata);
1625 close(bprm->fd);
1626 return -ELIBBAD;
1627 }
1628 }
1629
1630 /* OK, we are done with that, now set up the arg stuff,
1631 and then start this sucker up */
1632
1633 {
1634 char * passed_p;
1635
1636 if (interpreter_type == INTERPRETER_AOUT) {
1637 snprintf(passed_fileno, sizeof(passed_fileno), "%d", bprm->fd);
1638 passed_p = passed_fileno;
1639
1640 if (elf_interpreter) {
1641 bprm->p = copy_elf_strings(1,&passed_p,bprm->page,bprm->p);
1642 bprm->argc++;
1643 }
1644 }
1645 if (!bprm->p) {
1646 if (elf_interpreter) {
1647 free(elf_interpreter);
1648 }
1649 free (elf_phdata);
1650 close(bprm->fd);
1651 return -E2BIG;
1652 }
1653 }
1654
1655 /* OK, This is the point of no return */
1656 info->end_data = 0;
1657 info->end_code = 0;
1658 info->start_mmap = (abi_ulong)ELF_START_MMAP;
1659 info->mmap = 0;
1660 elf_entry = (abi_ulong) elf_ex.e_entry;
1661
1662 #if defined(CONFIG_USE_GUEST_BASE)
1663 /*
1664 * In case where user has not explicitly set the guest_base, we
1665 * probe here that should we set it automatically.
1666 */
1667 if (!have_guest_base) {
1668 /*
1669 * Go through ELF program header table and find out whether
1670 * any of the segments drop below our current mmap_min_addr and
1671 * in that case set guest_base to corresponding address.
1672 */
1673 for (i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum;
1674 i++, elf_ppnt++) {
1675 if (elf_ppnt->p_type != PT_LOAD)
1676 continue;
1677 if (HOST_PAGE_ALIGN(elf_ppnt->p_vaddr) < mmap_min_addr) {
1678 guest_base = HOST_PAGE_ALIGN(mmap_min_addr);
1679 break;
1680 }
1681 }
1682 }
1683 #endif /* CONFIG_USE_GUEST_BASE */
1684
1685 /* Do this so that we can load the interpreter, if need be. We will
1686 change some of these later */
1687 info->rss = 0;
1688 bprm->p = setup_arg_pages(bprm->p, bprm, info);
1689 info->start_stack = bprm->p;
1690
1691 /* Now we do a little grungy work by mmaping the ELF image into
1692 * the correct location in memory. At this point, we assume that
1693 * the image should be loaded at fixed address, not at a variable
1694 * address.
1695 */
1696
1697 for(i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum; i++, elf_ppnt++) {
1698 int elf_prot = 0;
1699 int elf_flags = 0;
1700 abi_ulong error;
1701
1702 if (elf_ppnt->p_type != PT_LOAD)
1703 continue;
1704
1705 if (elf_ppnt->p_flags & PF_R) elf_prot |= PROT_READ;
1706 if (elf_ppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
1707 if (elf_ppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
1708 elf_flags = MAP_PRIVATE | MAP_DENYWRITE;
1709 if (elf_ex.e_type == ET_EXEC || load_addr_set) {
1710 elf_flags |= MAP_FIXED;
1711 } else if (elf_ex.e_type == ET_DYN) {
1712 /* Try and get dynamic programs out of the way of the default mmap
1713 base, as well as whatever program they might try to exec. This
1714 is because the brk will follow the loader, and is not movable. */
1715 /* NOTE: for qemu, we do a big mmap to get enough space
1716 without hardcoding any address */
1717 error = target_mmap(0, ET_DYN_MAP_SIZE,
1718 PROT_NONE, MAP_PRIVATE | MAP_ANON,
1719 -1, 0);
1720 if (error == -1) {
1721 perror("mmap");
1722 exit(-1);
1723 }
1724 load_bias = TARGET_ELF_PAGESTART(error - elf_ppnt->p_vaddr);
1725 }
1726
1727 error = target_mmap(TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr),
1728 (elf_ppnt->p_filesz +
1729 TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)),
1730 elf_prot,
1731 (MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE),
1732 bprm->fd,
1733 (elf_ppnt->p_offset -
1734 TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)));
1735 if (error == -1) {
1736 perror("mmap");
1737 exit(-1);
1738 }
1739
1740 #ifdef LOW_ELF_STACK
1741 if (TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr) < elf_stack)
1742 elf_stack = TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr);
1743 #endif
1744
1745 if (!load_addr_set) {
1746 load_addr_set = 1;
1747 load_addr = elf_ppnt->p_vaddr - elf_ppnt->p_offset;
1748 if (elf_ex.e_type == ET_DYN) {
1749 load_bias += error -
1750 TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr);
1751 load_addr += load_bias;
1752 reloc_func_desc = load_bias;
1753 }
1754 }
1755 k = elf_ppnt->p_vaddr;
1756 if (k < start_code)
1757 start_code = k;
1758 if (start_data < k)
1759 start_data = k;
1760 k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
1761 if (k > elf_bss)
1762 elf_bss = k;
1763 if ((elf_ppnt->p_flags & PF_X) && end_code < k)
1764 end_code = k;
1765 if (end_data < k)
1766 end_data = k;
1767 k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
1768 if (k > elf_brk) elf_brk = k;
1769 }
1770
1771 elf_entry += load_bias;
1772 elf_bss += load_bias;
1773 elf_brk += load_bias;
1774 start_code += load_bias;
1775 end_code += load_bias;
1776 start_data += load_bias;
1777 end_data += load_bias;
1778
1779 if (elf_interpreter) {
1780 if (interpreter_type & 1) {
1781 elf_entry = load_aout_interp(&interp_ex, interpreter_fd);
1782 }
1783 else if (interpreter_type & 2) {
1784 elf_entry = load_elf_interp(&interp_elf_ex, interpreter_fd,
1785 &interp_load_addr);
1786 }
1787 reloc_func_desc = interp_load_addr;
1788
1789 close(interpreter_fd);
1790 free(elf_interpreter);
1791
1792 if (elf_entry == ~((abi_ulong)0UL)) {
1793 printf("Unable to load interpreter\n");
1794 free(elf_phdata);
1795 exit(-1);
1796 return 0;
1797 }
1798 }
1799
1800 free(elf_phdata);
1801
1802 if (qemu_log_enabled())
1803 load_symbols(&elf_ex, bprm->fd);
1804
1805 if (interpreter_type != INTERPRETER_AOUT) close(bprm->fd);
1806 info->personality = (ibcs2_interpreter ? PER_SVR4 : PER_LINUX);
1807
1808 #ifdef LOW_ELF_STACK
1809 info->start_stack = bprm->p = elf_stack - 4;
1810 #endif
1811 bprm->p = create_elf_tables(bprm->p,
1812 bprm->argc,
1813 bprm->envc,
1814 &elf_ex,
1815 load_addr, load_bias,
1816 interp_load_addr,
1817 (interpreter_type == INTERPRETER_AOUT ? 0 : 1),
1818 info);
1819 info->load_addr = reloc_func_desc;
1820 info->start_brk = info->brk = elf_brk;
1821 info->end_code = end_code;
1822 info->start_code = start_code;
1823 info->start_data = start_data;
1824 info->end_data = end_data;
1825 info->start_stack = bprm->p;
1826
1827 /* Calling set_brk effectively mmaps the pages that we need for the bss and break
1828 sections */
1829 set_brk(elf_bss, elf_brk);
1830
1831 padzero(elf_bss, elf_brk);
1832
1833 #if 0
1834 printf("(start_brk) %x\n" , info->start_brk);
1835 printf("(end_code) %x\n" , info->end_code);
1836 printf("(start_code) %x\n" , info->start_code);
1837 printf("(end_data) %x\n" , info->end_data);
1838 printf("(start_stack) %x\n" , info->start_stack);
1839 printf("(brk) %x\n" , info->brk);
1840 #endif
1841
1842 if ( info->personality == PER_SVR4 )
1843 {
1844 /* Why this, you ask??? Well SVr4 maps page 0 as read-only,
1845 and some applications "depend" upon this behavior.
1846 Since we do not have the power to recompile these, we
1847 emulate the SVr4 behavior. Sigh. */
1848 mapped_addr = target_mmap(0, qemu_host_page_size, PROT_READ | PROT_EXEC,
1849 MAP_FIXED | MAP_PRIVATE, -1, 0);
1850 }
1851
1852 info->entry = elf_entry;
1853
1854 #ifdef USE_ELF_CORE_DUMP
1855 bprm->core_dump = &elf_core_dump;
1856 #endif
1857
1858 return 0;
1859 }
1860
1861 #ifdef USE_ELF_CORE_DUMP
1862
1863 /*
1864 * Definitions to generate Intel SVR4-like core files.
1865 * These mostly have the same names as the SVR4 types with "target_elf_"
1866 * tacked on the front to prevent clashes with linux definitions,
1867 * and the typedef forms have been avoided. This is mostly like
1868 * the SVR4 structure, but more Linuxy, with things that Linux does
1869 * not support and which gdb doesn't really use excluded.
1870 *
1871 * Fields we don't dump (their contents is zero) in linux-user qemu
1872 * are marked with XXX.
1873 *
1874 * Core dump code is copied from linux kernel (fs/binfmt_elf.c).
1875 *
1876 * Porting ELF coredump for target is (quite) simple process. First you
1877 * define USE_ELF_CORE_DUMP in target ELF code (where init_thread() for
1878 * the target resides):
1879 *
1880 * #define USE_ELF_CORE_DUMP
1881 *
1882 * Next you define type of register set used for dumping. ELF specification
1883 * says that it needs to be array of elf_greg_t that has size of ELF_NREG.
1884 *
1885 * typedef <target_regtype> target_elf_greg_t;
1886 * #define ELF_NREG <number of registers>
1887 * typedef taret_elf_greg_t target_elf_gregset_t[ELF_NREG];
1888 *
1889 * Last step is to implement target specific function that copies registers
1890 * from given cpu into just specified register set. Prototype is:
1891 *
1892 * static void elf_core_copy_regs(taret_elf_gregset_t *regs,
1893 * const CPUState *env);
1894 *
1895 * Parameters:
1896 * regs - copy register values into here (allocated and zeroed by caller)
1897 * env - copy registers from here
1898 *
1899 * Example for ARM target is provided in this file.
1900 */
1901
1902 /* An ELF note in memory */
1903 struct memelfnote {
1904 const char *name;
1905 size_t namesz;
1906 size_t namesz_rounded;
1907 int type;
1908 size_t datasz;
1909 void *data;
1910 size_t notesz;
1911 };
1912
1913 struct target_elf_siginfo {
1914 int si_signo; /* signal number */
1915 int si_code; /* extra code */
1916 int si_errno; /* errno */
1917 };
1918
1919 struct target_elf_prstatus {
1920 struct target_elf_siginfo pr_info; /* Info associated with signal */
1921 short pr_cursig; /* Current signal */
1922 target_ulong pr_sigpend; /* XXX */
1923 target_ulong pr_sighold; /* XXX */
1924 target_pid_t pr_pid;
1925 target_pid_t pr_ppid;
1926 target_pid_t pr_pgrp;
1927 target_pid_t pr_sid;
1928 struct target_timeval pr_utime; /* XXX User time */
1929 struct target_timeval pr_stime; /* XXX System time */
1930 struct target_timeval pr_cutime; /* XXX Cumulative user time */
1931 struct target_timeval pr_cstime; /* XXX Cumulative system time */
1932 target_elf_gregset_t pr_reg; /* GP registers */
1933 int pr_fpvalid; /* XXX */
1934 };
1935
1936 #define ELF_PRARGSZ (80) /* Number of chars for args */
1937
1938 struct target_elf_prpsinfo {
1939 char pr_state; /* numeric process state */
1940 char pr_sname; /* char for pr_state */
1941 char pr_zomb; /* zombie */
1942 char pr_nice; /* nice val */
1943 target_ulong pr_flag; /* flags */
1944 target_uid_t pr_uid;
1945 target_gid_t pr_gid;
1946 target_pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid;
1947 /* Lots missing */
1948 char pr_fname[16]; /* filename of executable */
1949 char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
1950 };
1951
1952 /* Here is the structure in which status of each thread is captured. */
1953 struct elf_thread_status {
1954 QTAILQ_ENTRY(elf_thread_status) ets_link;
1955 struct target_elf_prstatus prstatus; /* NT_PRSTATUS */
1956 #if 0
1957 elf_fpregset_t fpu; /* NT_PRFPREG */
1958 struct task_struct *thread;
1959 elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */
1960 #endif
1961 struct memelfnote notes[1];
1962 int num_notes;
1963 };
1964
1965 struct elf_note_info {
1966 struct memelfnote *notes;
1967 struct target_elf_prstatus *prstatus; /* NT_PRSTATUS */
1968 struct target_elf_prpsinfo *psinfo; /* NT_PRPSINFO */
1969
1970 QTAILQ_HEAD(thread_list_head, elf_thread_status) thread_list;
1971 #if 0
1972 /*
1973 * Current version of ELF coredump doesn't support
1974 * dumping fp regs etc.
1975 */
1976 elf_fpregset_t *fpu;
1977 elf_fpxregset_t *xfpu;
1978 int thread_status_size;
1979 #endif
1980 int notes_size;
1981 int numnote;
1982 };
1983
1984 struct vm_area_struct {
1985 abi_ulong vma_start; /* start vaddr of memory region */
1986 abi_ulong vma_end; /* end vaddr of memory region */
1987 abi_ulong vma_flags; /* protection etc. flags for the region */
1988 QTAILQ_ENTRY(vm_area_struct) vma_link;
1989 };
1990
1991 struct mm_struct {
1992 QTAILQ_HEAD(, vm_area_struct) mm_mmap;
1993 int mm_count; /* number of mappings */
1994 };
1995
1996 static struct mm_struct *vma_init(void);
1997 static void vma_delete(struct mm_struct *);
1998 static int vma_add_mapping(struct mm_struct *, abi_ulong,
1999 abi_ulong, abi_ulong);
2000 static int vma_get_mapping_count(const struct mm_struct *);
2001 static struct vm_area_struct *vma_first(const struct mm_struct *);
2002 static struct vm_area_struct *vma_next(struct vm_area_struct *);
2003 static abi_ulong vma_dump_size(const struct vm_area_struct *);
2004 static int vma_walker(void *priv, abi_ulong start, abi_ulong end,
2005 unsigned long flags);
2006
2007 static void fill_elf_header(struct elfhdr *, int, uint16_t, uint32_t);
2008 static void fill_note(struct memelfnote *, const char *, int,
2009 unsigned int, void *);
2010 static void fill_prstatus(struct target_elf_prstatus *, const TaskState *, int);
2011 static int fill_psinfo(struct target_elf_prpsinfo *, const TaskState *);
2012 static void fill_auxv_note(struct memelfnote *, const TaskState *);
2013 static void fill_elf_note_phdr(struct elf_phdr *, int, off_t);
2014 static size_t note_size(const struct memelfnote *);
2015 static void free_note_info(struct elf_note_info *);
2016 static int fill_note_info(struct elf_note_info *, long, const CPUState *);
2017 static void fill_thread_info(struct elf_note_info *, const CPUState *);
2018 static int core_dump_filename(const TaskState *, char *, size_t);
2019
2020 static int dump_write(int, const void *, size_t);
2021 static int write_note(struct memelfnote *, int);
2022 static int write_note_info(struct elf_note_info *, int);
2023
2024 #ifdef BSWAP_NEEDED
2025 static void bswap_prstatus(struct target_elf_prstatus *);
2026 static void bswap_psinfo(struct target_elf_prpsinfo *);
2027
2028 static void bswap_prstatus(struct target_elf_prstatus *prstatus)
2029 {
2030 prstatus->pr_info.si_signo = tswapl(prstatus->pr_info.si_signo);
2031 prstatus->pr_info.si_code = tswapl(prstatus->pr_info.si_code);
2032 prstatus->pr_info.si_errno = tswapl(prstatus->pr_info.si_errno);
2033 prstatus->pr_cursig = tswap16(prstatus->pr_cursig);
2034 prstatus->pr_sigpend = tswapl(prstatus->pr_sigpend);
2035 prstatus->pr_sighold = tswapl(prstatus->pr_sighold);
2036 prstatus->pr_pid = tswap32(prstatus->pr_pid);
2037 prstatus->pr_ppid = tswap32(prstatus->pr_ppid);
2038 prstatus->pr_pgrp = tswap32(prstatus->pr_pgrp);
2039 prstatus->pr_sid = tswap32(prstatus->pr_sid);
2040 /* cpu times are not filled, so we skip them */
2041 /* regs should be in correct format already */
2042 prstatus->pr_fpvalid = tswap32(prstatus->pr_fpvalid);
2043 }
2044
2045 static void bswap_psinfo(struct target_elf_prpsinfo *psinfo)
2046 {
2047 psinfo->pr_flag = tswapl(psinfo->pr_flag);
2048 psinfo->pr_uid = tswap16(psinfo->pr_uid);
2049 psinfo->pr_gid = tswap16(psinfo->pr_gid);
2050 psinfo->pr_pid = tswap32(psinfo->pr_pid);
2051 psinfo->pr_ppid = tswap32(psinfo->pr_ppid);
2052 psinfo->pr_pgrp = tswap32(psinfo->pr_pgrp);
2053 psinfo->pr_sid = tswap32(psinfo->pr_sid);
2054 }
2055 #endif /* BSWAP_NEEDED */
2056
2057 /*
2058 * Minimal support for linux memory regions. These are needed
2059 * when we are finding out what memory exactly belongs to
2060 * emulated process. No locks needed here, as long as
2061 * thread that received the signal is stopped.
2062 */
2063
2064 static struct mm_struct *vma_init(void)
2065 {
2066 struct mm_struct *mm;
2067
2068 if ((mm = qemu_malloc(sizeof (*mm))) == NULL)
2069 return (NULL);
2070
2071 mm->mm_count = 0;
2072 QTAILQ_INIT(&mm->mm_mmap);
2073
2074 return (mm);
2075 }
2076
2077 static void vma_delete(struct mm_struct *mm)
2078 {
2079 struct vm_area_struct *vma;
2080
2081 while ((vma = vma_first(mm)) != NULL) {
2082 QTAILQ_REMOVE(&mm->mm_mmap, vma, vma_link);
2083 qemu_free(vma);
2084 }
2085 qemu_free(mm);
2086 }
2087
2088 static int vma_add_mapping(struct mm_struct *mm, abi_ulong start,
2089 abi_ulong end, abi_ulong flags)
2090 {
2091 struct vm_area_struct *vma;
2092
2093 if ((vma = qemu_mallocz(sizeof (*vma))) == NULL)
2094 return (-1);
2095
2096 vma->vma_start = start;
2097 vma->vma_end = end;
2098 vma->vma_flags = flags;
2099
2100 QTAILQ_INSERT_TAIL(&mm->mm_mmap, vma, vma_link);
2101 mm->mm_count++;
2102
2103 return (0);
2104 }
2105
2106 static struct vm_area_struct *vma_first(const struct mm_struct *mm)
2107 {
2108 return (QTAILQ_FIRST(&mm->mm_mmap));
2109 }
2110
2111 static struct vm_area_struct *vma_next(struct vm_area_struct *vma)
2112 {
2113 return (QTAILQ_NEXT(vma, vma_link));
2114 }
2115
2116 static int vma_get_mapping_count(const struct mm_struct *mm)
2117 {
2118 return (mm->mm_count);
2119 }
2120
2121 /*
2122 * Calculate file (dump) size of given memory region.
2123 */
2124 static abi_ulong vma_dump_size(const struct vm_area_struct *vma)
2125 {
2126 /* if we cannot even read the first page, skip it */
2127 if (!access_ok(VERIFY_READ, vma->vma_start, TARGET_PAGE_SIZE))
2128 return (0);
2129
2130 /*
2131 * Usually we don't dump executable pages as they contain
2132 * non-writable code that debugger can read directly from
2133 * target library etc. However, thread stacks are marked
2134 * also executable so we read in first page of given region
2135 * and check whether it contains elf header. If there is
2136 * no elf header, we dump it.
2137 */
2138 if (vma->vma_flags & PROT_EXEC) {
2139 char page[TARGET_PAGE_SIZE];
2140
2141 copy_from_user(page, vma->vma_start, sizeof (page));
2142 if ((page[EI_MAG0] == ELFMAG0) &&
2143 (page[EI_MAG1] == ELFMAG1) &&
2144 (page[EI_MAG2] == ELFMAG2) &&
2145 (page[EI_MAG3] == ELFMAG3)) {
2146 /*
2147 * Mappings are possibly from ELF binary. Don't dump
2148 * them.
2149 */
2150 return (0);
2151 }
2152 }
2153
2154 return (vma->vma_end - vma->vma_start);
2155 }
2156
2157 static int vma_walker(void *priv, abi_ulong start, abi_ulong end,
2158 unsigned long flags)
2159 {
2160 struct mm_struct *mm = (struct mm_struct *)priv;
2161
2162 /*
2163 * Don't dump anything that qemu has reserved for internal use.
2164 */
2165 if (flags & PAGE_RESERVED)
2166 return (0);
2167
2168 vma_add_mapping(mm, start, end, flags);
2169 return (0);
2170 }
2171
2172 static void fill_note(struct memelfnote *note, const char *name, int type,
2173 unsigned int sz, void *data)
2174 {
2175 unsigned int namesz;
2176
2177 namesz = strlen(name) + 1;
2178 note->name = name;
2179 note->namesz = namesz;
2180 note->namesz_rounded = roundup(namesz, sizeof (int32_t));
2181 note->type = type;
2182 note->datasz = roundup(sz, sizeof (int32_t));;
2183 note->data = data;
2184
2185 /*
2186 * We calculate rounded up note size here as specified by
2187 * ELF document.
2188 */
2189 note->notesz = sizeof (struct elf_note) +
2190 note->namesz_rounded + note->datasz;
2191 }
2192
2193 static void fill_elf_header(struct elfhdr *elf, int segs, uint16_t machine,
2194 uint32_t flags)
2195 {
2196 (void) memset(elf, 0, sizeof(*elf));
2197
2198 (void) memcpy(elf->e_ident, ELFMAG, SELFMAG);
2199 elf->e_ident[EI_CLASS] = ELF_CLASS;
2200 elf->e_ident[EI_DATA] = ELF_DATA;
2201 elf->e_ident[EI_VERSION] = EV_CURRENT;
2202 elf->e_ident[EI_OSABI] = ELF_OSABI;
2203
2204 elf->e_type = ET_CORE;
2205 elf->e_machine = machine;
2206 elf->e_version = EV_CURRENT;
2207 elf->e_phoff = sizeof(struct elfhdr);
2208 elf->e_flags = flags;
2209 elf->e_ehsize = sizeof(struct elfhdr);
2210 elf->e_phentsize = sizeof(struct elf_phdr);
2211 elf->e_phnum = segs;
2212
2213 #ifdef BSWAP_NEEDED
2214 bswap_ehdr(elf);
2215 #endif
2216 }
2217
2218 static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, off_t offset)
2219 {
2220 phdr->p_type = PT_NOTE;
2221 phdr->p_offset = offset;
2222 phdr->p_vaddr = 0;
2223 phdr->p_paddr = 0;
2224 phdr->p_filesz = sz;
2225 phdr->p_memsz = 0;
2226 phdr->p_flags = 0;
2227 phdr->p_align = 0;
2228
2229 #ifdef BSWAP_NEEDED
2230 bswap_phdr(phdr);
2231 #endif
2232 }
2233
2234 static size_t note_size(const struct memelfnote *note)
2235 {
2236 return (note->notesz);
2237 }
2238
2239 static void fill_prstatus(struct target_elf_prstatus *prstatus,
2240 const TaskState *ts, int signr)
2241 {
2242 (void) memset(prstatus, 0, sizeof (*prstatus));
2243 prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
2244 prstatus->pr_pid = ts->ts_tid;
2245 prstatus->pr_ppid = getppid();
2246 prstatus->pr_pgrp = getpgrp();
2247 prstatus->pr_sid = getsid(0);
2248
2249 #ifdef BSWAP_NEEDED
2250 bswap_prstatus(prstatus);
2251 #endif
2252 }
2253
2254 static int fill_psinfo(struct target_elf_prpsinfo *psinfo, const TaskState *ts)
2255 {
2256 char *filename, *base_filename;
2257 unsigned int i, len;
2258
2259 (void) memset(psinfo, 0, sizeof (*psinfo));
2260
2261 len = ts->info->arg_end - ts->info->arg_start;
2262 if (len >= ELF_PRARGSZ)
2263 len = ELF_PRARGSZ - 1;
2264 if (copy_from_user(&psinfo->pr_psargs, ts->info->arg_start, len))
2265 return -EFAULT;
2266 for (i = 0; i < len; i++)
2267 if (psinfo->pr_psargs[i] == 0)
2268 psinfo->pr_psargs[i] = ' ';
2269 psinfo->pr_psargs[len] = 0;
2270
2271 psinfo->pr_pid = getpid();
2272 psinfo->pr_ppid = getppid();
2273 psinfo->pr_pgrp = getpgrp();
2274 psinfo->pr_sid = getsid(0);
2275 psinfo->pr_uid = getuid();
2276 psinfo->pr_gid = getgid();
2277
2278 filename = strdup(ts->bprm->filename);
2279 base_filename = strdup(basename(filename));
2280 (void) strncpy(psinfo->pr_fname, base_filename,
2281 sizeof(psinfo->pr_fname));
2282 free(base_filename);
2283 free(filename);
2284
2285 #ifdef BSWAP_NEEDED
2286 bswap_psinfo(psinfo);
2287 #endif
2288 return (0);
2289 }
2290
2291 static void fill_auxv_note(struct memelfnote *note, const TaskState *ts)
2292 {
2293 elf_addr_t auxv = (elf_addr_t)ts->info->saved_auxv;
2294 elf_addr_t orig_auxv = auxv;
2295 abi_ulong val;
2296 void *ptr;
2297 int i, len;
2298
2299 /*
2300 * Auxiliary vector is stored in target process stack. It contains
2301 * {type, value} pairs that we need to dump into note. This is not
2302 * strictly necessary but we do it here for sake of completeness.
2303 */
2304
2305 /* find out lenght of the vector, AT_NULL is terminator */
2306 i = len = 0;
2307 do {
2308 get_user_ual(val, auxv);
2309 i += 2;
2310 auxv += 2 * sizeof (elf_addr_t);
2311 } while (val != AT_NULL);
2312 len = i * sizeof (elf_addr_t);
2313
2314 /* read in whole auxv vector and copy it to memelfnote */
2315 ptr = lock_user(VERIFY_READ, orig_auxv, len, 0);
2316 if (ptr != NULL) {
2317 fill_note(note, "CORE", NT_AUXV, len, ptr);
2318 unlock_user(ptr, auxv, len);
2319 }
2320 }
2321
2322 /*
2323 * Constructs name of coredump file. We have following convention
2324 * for the name:
2325 * qemu_<basename-of-target-binary>_<date>-<time>_<pid>.core
2326 *
2327 * Returns 0 in case of success, -1 otherwise (errno is set).
2328 */
2329 static int core_dump_filename(const TaskState *ts, char *buf,
2330 size_t bufsize)
2331 {
2332 char timestamp[64];
2333 char *filename = NULL;
2334 char *base_filename = NULL;
2335 struct timeval tv;
2336 struct tm tm;
2337
2338 assert(bufsize >= PATH_MAX);
2339
2340 if (gettimeofday(&tv, NULL) < 0) {
2341 (void) fprintf(stderr, "unable to get current timestamp: %s",
2342 strerror(errno));
2343 return (-1);
2344 }
2345
2346 filename = strdup(ts->bprm->filename);
2347 base_filename = strdup(basename(filename));
2348 (void) strftime(timestamp, sizeof (timestamp), "%Y%m%d-%H%M%S",
2349 localtime_r(&tv.tv_sec, &tm));
2350 (void) snprintf(buf, bufsize, "qemu_%s_%s_%d.core",
2351 base_filename, timestamp, (int)getpid());
2352 free(base_filename);
2353 free(filename);
2354
2355 return (0);
2356 }
2357
2358 static int dump_write(int fd, const void *ptr, size_t size)
2359 {
2360 const char *bufp = (const char *)ptr;
2361 ssize_t bytes_written, bytes_left;
2362 struct rlimit dumpsize;
2363 off_t pos;
2364
2365 bytes_written = 0;
2366 getrlimit(RLIMIT_CORE, &dumpsize);
2367 if ((pos = lseek(fd, 0, SEEK_CUR))==-1) {
2368 if (errno == ESPIPE) { /* not a seekable stream */
2369 bytes_left = size;
2370 } else {
2371 return pos;
2372 }
2373 } else {
2374 if (dumpsize.rlim_cur <= pos) {
2375 return -1;
2376 } else if (dumpsize.rlim_cur == RLIM_INFINITY) {
2377 bytes_left = size;
2378 } else {
2379 size_t limit_left=dumpsize.rlim_cur - pos;
2380 bytes_left = limit_left >= size ? size : limit_left ;
2381 }
2382 }
2383
2384 /*
2385 * In normal conditions, single write(2) should do but
2386 * in case of socket etc. this mechanism is more portable.
2387 */
2388 do {
2389 bytes_written = write(fd, bufp, bytes_left);
2390 if (bytes_written < 0) {
2391 if (errno == EINTR)
2392 continue;
2393 return (-1);
2394 } else if (bytes_written == 0) { /* eof */
2395 return (-1);
2396 }
2397 bufp += bytes_written;
2398 bytes_left -= bytes_written;
2399 } while (bytes_left > 0);
2400
2401 return (0);
2402 }
2403
2404 static int write_note(struct memelfnote *men, int fd)
2405 {
2406 struct elf_note en;
2407
2408 en.n_namesz = men->namesz;
2409 en.n_type = men->type;
2410 en.n_descsz = men->datasz;
2411
2412 #ifdef BSWAP_NEEDED
2413 bswap_note(&en);
2414 #endif
2415
2416 if (dump_write(fd, &en, sizeof(en)) != 0)
2417 return (-1);
2418 if (dump_write(fd, men->name, men->namesz_rounded) != 0)
2419 return (-1);
2420 if (dump_write(fd, men->data, men->datasz) != 0)
2421 return (-1);
2422
2423 return (0);
2424 }
2425
2426 static void fill_thread_info(struct elf_note_info *info, const CPUState *env)
2427 {
2428 TaskState *ts = (TaskState *)env->opaque;
2429 struct elf_thread_status *ets;
2430
2431 ets = qemu_mallocz(sizeof (*ets));
2432 ets->num_notes = 1; /* only prstatus is dumped */
2433 fill_prstatus(&ets->prstatus, ts, 0);
2434 elf_core_copy_regs(&ets->prstatus.pr_reg, env);
2435 fill_note(&ets->notes[0], "CORE", NT_PRSTATUS, sizeof (ets->prstatus),
2436 &ets->prstatus);
2437
2438 QTAILQ_INSERT_TAIL(&info->thread_list, ets, ets_link);
2439
2440 info->notes_size += note_size(&ets->notes[0]);
2441 }
2442
2443 static int fill_note_info(struct elf_note_info *info,
2444 long signr, const CPUState *env)
2445 {
2446 #define NUMNOTES 3
2447 CPUState *cpu = NULL;
2448 TaskState *ts = (TaskState *)env->opaque;
2449 int i;
2450
2451 (void) memset(info, 0, sizeof (*info));
2452
2453 QTAILQ_INIT(&info->thread_list);
2454
2455 info->notes = qemu_mallocz(NUMNOTES * sizeof (struct memelfnote));
2456 if (info->notes == NULL)
2457 return (-ENOMEM);
2458 info->prstatus = qemu_mallocz(sizeof (*info->prstatus));
2459 if (info->prstatus == NULL)
2460 return (-ENOMEM);
2461 info->psinfo = qemu_mallocz(sizeof (*info->psinfo));
2462 if (info->prstatus == NULL)
2463 return (-ENOMEM);
2464
2465 /*
2466 * First fill in status (and registers) of current thread
2467 * including process info & aux vector.
2468 */
2469 fill_prstatus(info->prstatus, ts, signr);
2470 elf_core_copy_regs(&info->prstatus->pr_reg, env);
2471 fill_note(&info->notes[0], "CORE", NT_PRSTATUS,
2472 sizeof (*info->prstatus), info->prstatus);
2473 fill_psinfo(info->psinfo, ts);
2474 fill_note(&info->notes[1], "CORE", NT_PRPSINFO,
2475 sizeof (*info->psinfo), info->psinfo);
2476 fill_auxv_note(&info->notes[2], ts);
2477 info->numnote = 3;
2478
2479 info->notes_size = 0;
2480 for (i = 0; i < info->numnote; i++)
2481 info->notes_size += note_size(&info->notes[i]);
2482
2483 /* read and fill status of all threads */
2484 cpu_list_lock();
2485 for (cpu = first_cpu; cpu != NULL; cpu = cpu->next_cpu) {
2486 if (cpu == thread_env)
2487 continue;
2488 fill_thread_info(info, cpu);
2489 }
2490 cpu_list_unlock();
2491
2492 return (0);
2493 }
2494
2495 static void free_note_info(struct elf_note_info *info)
2496 {
2497 struct elf_thread_status *ets;
2498
2499 while (!QTAILQ_EMPTY(&info->thread_list)) {
2500 ets = QTAILQ_FIRST(&info->thread_list);
2501 QTAILQ_REMOVE(&info->thread_list, ets, ets_link);
2502 qemu_free(ets);
2503 }
2504
2505 qemu_free(info->prstatus);
2506 qemu_free(info->psinfo);
2507 qemu_free(info->notes);
2508 }
2509
2510 static int write_note_info(struct elf_note_info *info, int fd)
2511 {
2512 struct elf_thread_status *ets;
2513 int i, error = 0;
2514
2515 /* write prstatus, psinfo and auxv for current thread */
2516 for (i = 0; i < info->numnote; i++)
2517 if ((error = write_note(&info->notes[i], fd)) != 0)
2518 return (error);
2519
2520 /* write prstatus for each thread */
2521 for (ets = info->thread_list.tqh_first; ets != NULL;
2522 ets = ets->ets_link.tqe_next) {
2523 if ((error = write_note(&ets->notes[0], fd)) != 0)
2524 return (error);
2525 }
2526
2527 return (0);
2528 }
2529
2530 /*
2531 * Write out ELF coredump.
2532 *
2533 * See documentation of ELF object file format in:
2534 * http://www.caldera.com/developers/devspecs/gabi41.pdf
2535 *
2536 * Coredump format in linux is following:
2537 *
2538 * 0 +----------------------+ \
2539 * | ELF header | ET_CORE |
2540 * +----------------------+ |
2541 * | ELF program headers | |--- headers
2542 * | - NOTE section | |
2543 * | - PT_LOAD sections | |
2544 * +----------------------+ /
2545 * | NOTEs: |
2546 * | - NT_PRSTATUS |
2547 * | - NT_PRSINFO |
2548 * | - NT_AUXV |
2549 * +----------------------+ <-- aligned to target page
2550 * | Process memory dump |
2551 * : :
2552 * . .
2553 * : :
2554 * | |
2555 * +----------------------+
2556 *
2557 * NT_PRSTATUS -> struct elf_prstatus (per thread)
2558 * NT_PRSINFO -> struct elf_prpsinfo
2559 * NT_AUXV is array of { type, value } pairs (see fill_auxv_note()).
2560 *
2561 * Format follows System V format as close as possible. Current
2562 * version limitations are as follows:
2563 * - no floating point registers are dumped
2564 *
2565 * Function returns 0 in case of success, negative errno otherwise.
2566 *
2567 * TODO: make this work also during runtime: it should be
2568 * possible to force coredump from running process and then
2569 * continue processing. For example qemu could set up SIGUSR2
2570 * handler (provided that target process haven't registered
2571 * handler for that) that does the dump when signal is received.
2572 */
2573 static int elf_core_dump(int signr, const CPUState *env)
2574 {
2575 const TaskState *ts = (const TaskState *)env->opaque;
2576 struct vm_area_struct *vma = NULL;
2577 char corefile[PATH_MAX];
2578 struct elf_note_info info;
2579 struct elfhdr elf;
2580 struct elf_phdr phdr;
2581 struct rlimit dumpsize;
2582 struct mm_struct *mm = NULL;
2583 off_t offset = 0, data_offset = 0;
2584 int segs = 0;
2585 int fd = -1;
2586
2587 errno = 0;
2588 getrlimit(RLIMIT_CORE, &dumpsize);
2589 if (dumpsize.rlim_cur == 0)
2590 return 0;
2591
2592 if (core_dump_filename(ts, corefile, sizeof (corefile)) < 0)
2593 return (-errno);
2594
2595 if ((fd = open(corefile, O_WRONLY | O_CREAT,
2596 S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)) < 0)
2597 return (-errno);
2598
2599 /*
2600 * Walk through target process memory mappings and
2601 * set up structure containing this information. After
2602 * this point vma_xxx functions can be used.
2603 */
2604 if ((mm = vma_init()) == NULL)
2605 goto out;
2606
2607 walk_memory_regions(mm, vma_walker);
2608 segs = vma_get_mapping_count(mm);
2609
2610 /*
2611 * Construct valid coredump ELF header. We also
2612 * add one more segment for notes.
2613 */
2614 fill_elf_header(&elf, segs + 1, ELF_MACHINE, 0);
2615 if (dump_write(fd, &elf, sizeof (elf)) != 0)
2616 goto out;
2617
2618 /* fill in in-memory version of notes */
2619 if (fill_note_info(&info, signr, env) < 0)
2620 goto out;
2621
2622 offset += sizeof (elf); /* elf header */
2623 offset += (segs + 1) * sizeof (struct elf_phdr); /* program headers */
2624
2625 /* write out notes program header */
2626 fill_elf_note_phdr(&phdr, info.notes_size, offset);
2627
2628 offset += info.notes_size;
2629 if (dump_write(fd, &phdr, sizeof (phdr)) != 0)
2630 goto out;
2631
2632 /*
2633 * ELF specification wants data to start at page boundary so
2634 * we align it here.
2635 */
2636 offset = roundup(offset, ELF_EXEC_PAGESIZE);
2637
2638 /*
2639 * Write program headers for memory regions mapped in
2640 * the target process.
2641 */
2642 for (vma = vma_first(mm); vma != NULL; vma = vma_next(vma)) {
2643 (void) memset(&phdr, 0, sizeof (phdr));
2644
2645 phdr.p_type = PT_LOAD;
2646 phdr.p_offset = offset;
2647 phdr.p_vaddr = vma->vma_start;
2648 phdr.p_paddr = 0;
2649 phdr.p_filesz = vma_dump_size(vma);
2650 offset += phdr.p_filesz;
2651 phdr.p_memsz = vma->vma_end - vma->vma_start;
2652 phdr.p_flags = vma->vma_flags & PROT_READ ? PF_R : 0;
2653 if (vma->vma_flags & PROT_WRITE)
2654 phdr.p_flags |= PF_W;
2655 if (vma->vma_flags & PROT_EXEC)
2656 phdr.p_flags |= PF_X;
2657 phdr.p_align = ELF_EXEC_PAGESIZE;
2658
2659 dump_write(fd, &phdr, sizeof (phdr));
2660 }
2661
2662 /*
2663 * Next we write notes just after program headers. No
2664 * alignment needed here.
2665 */
2666 if (write_note_info(&info, fd) < 0)
2667 goto out;
2668
2669 /* align data to page boundary */
2670 data_offset = lseek(fd, 0, SEEK_CUR);
2671 data_offset = TARGET_PAGE_ALIGN(data_offset);
2672 if (lseek(fd, data_offset, SEEK_SET) != data_offset)
2673 goto out;
2674
2675 /*
2676 * Finally we can dump process memory into corefile as well.
2677 */
2678 for (vma = vma_first(mm); vma != NULL; vma = vma_next(vma)) {
2679 abi_ulong addr;
2680 abi_ulong end;
2681
2682 end = vma->vma_start + vma_dump_size(vma);
2683
2684 for (addr = vma->vma_start; addr < end;
2685 addr += TARGET_PAGE_SIZE) {
2686 char page[TARGET_PAGE_SIZE];
2687 int error;
2688
2689 /*
2690 * Read in page from target process memory and
2691 * write it to coredump file.
2692 */
2693 error = copy_from_user(page, addr, sizeof (page));
2694 if (error != 0) {
2695 (void) fprintf(stderr, "unable to dump " TARGET_ABI_FMT_lx "\n",
2696 addr);
2697 errno = -error;
2698 goto out;
2699 }
2700 if (dump_write(fd, page, TARGET_PAGE_SIZE) < 0)
2701 goto out;
2702 }
2703 }
2704
2705 out:
2706 free_note_info(&info);
2707 if (mm != NULL)
2708 vma_delete(mm);
2709 (void) close(fd);
2710
2711 if (errno != 0)
2712 return (-errno);
2713 return (0);
2714 }
2715
2716 #endif /* USE_ELF_CORE_DUMP */
2717
2718 static int load_aout_interp(void * exptr, int interp_fd)
2719 {
2720 printf("a.out interpreter not yet supported\n");
2721 return(0);
2722 }
2723
2724 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop)
2725 {
2726 init_thread(regs, infop);
2727 }
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