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linux-user: Handle images where lowest vaddr is not page aligned
[qemu.git] / linux-user / elfload.c
bloba13eb7be624f703b65b40ce13ec398d270290098
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
40 descriptors (signal handling) */
41 MMAP_PAGE_ZERO = 0x0100000,
42 ADDR_COMPAT_LAYOUT = 0x0200000,
43 READ_IMPLIES_EXEC = 0x0400000,
44 ADDR_LIMIT_32BIT = 0x0800000,
45 SHORT_INODE = 0x1000000,
46 WHOLE_SECONDS = 0x2000000,
47 STICKY_TIMEOUTS = 0x4000000,
48 ADDR_LIMIT_3GB = 0x8000000,
49 };
50
51 /*
52 * Personality types.
53 *
54 * These go in the low byte. Avoid using the top bit, it will
55 * conflict with error returns.
56 */
57 enum {
58 PER_LINUX = 0x0000,
59 PER_LINUX_32BIT = 0x0000 | ADDR_LIMIT_32BIT,
60 PER_LINUX_FDPIC = 0x0000 | FDPIC_FUNCPTRS,
61 PER_SVR4 = 0x0001 | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
62 PER_SVR3 = 0x0002 | STICKY_TIMEOUTS | SHORT_INODE,
63 PER_SCOSVR3 = 0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS | SHORT_INODE,
64 PER_OSR5 = 0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS,
65 PER_WYSEV386 = 0x0004 | STICKY_TIMEOUTS | SHORT_INODE,
66 PER_ISCR4 = 0x0005 | STICKY_TIMEOUTS,
67 PER_BSD = 0x0006,
68 PER_SUNOS = 0x0006 | STICKY_TIMEOUTS,
69 PER_XENIX = 0x0007 | STICKY_TIMEOUTS | SHORT_INODE,
70 PER_LINUX32 = 0x0008,
71 PER_LINUX32_3GB = 0x0008 | ADDR_LIMIT_3GB,
72 PER_IRIX32 = 0x0009 | STICKY_TIMEOUTS,/* IRIX5 32-bit */
73 PER_IRIXN32 = 0x000a | STICKY_TIMEOUTS,/* IRIX6 new 32-bit */
74 PER_IRIX64 = 0x000b | STICKY_TIMEOUTS,/* IRIX6 64-bit */
75 PER_RISCOS = 0x000c,
76 PER_SOLARIS = 0x000d | STICKY_TIMEOUTS,
77 PER_UW7 = 0x000e | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
78 PER_OSF4 = 0x000f, /* OSF/1 v4 */
79 PER_HPUX = 0x0010,
80 PER_MASK = 0x00ff,
81 };
82
83 /*
84 * Return the base personality without flags.
85 */
86 #define personality(pers) (pers & PER_MASK)
87
88 /* this flag is uneffective under linux too, should be deleted */
89 #ifndef MAP_DENYWRITE
90 #define MAP_DENYWRITE 0
91 #endif
92
93 /* should probably go in elf.h */
94 #ifndef ELIBBAD
95 #define ELIBBAD 80
96 #endif
97
98 #ifdef TARGET_WORDS_BIGENDIAN
99 #define ELF_DATA ELFDATA2MSB
100 #else
101 #define ELF_DATA ELFDATA2LSB
102 #endif
103
104 typedef target_ulong target_elf_greg_t;
105 #ifdef USE_UID16
106 typedef target_ushort target_uid_t;
107 typedef target_ushort target_gid_t;
108 #else
109 typedef target_uint target_uid_t;
110 typedef target_uint target_gid_t;
111 #endif
112 typedef target_int target_pid_t;
113
114 #ifdef TARGET_I386
115
116 #define ELF_PLATFORM get_elf_platform()
117
118 static const char *get_elf_platform(void)
119 {
120 static char elf_platform[] = "i386";
121 int family = (thread_env->cpuid_version >> 8) & 0xff;
122 if (family > 6)
123 family = 6;
124 if (family >= 3)
125 elf_platform[1] = '0' + family;
126 return elf_platform;
127 }
128
129 #define ELF_HWCAP get_elf_hwcap()
130
131 static uint32_t get_elf_hwcap(void)
132 {
133 return thread_env->cpuid_features;
134 }
135
136 #ifdef TARGET_X86_64
137 #define ELF_START_MMAP 0x2aaaaab000ULL
138 #define elf_check_arch(x) ( ((x) == ELF_ARCH) )
139
140 #define ELF_CLASS ELFCLASS64
141 #define ELF_ARCH EM_X86_64
142
143 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
144 {
145 regs->rax = 0;
146 regs->rsp = infop->start_stack;
147 regs->rip = infop->entry;
148 }
149
150 #define ELF_NREG 27
151 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
152
153 /*
154 * Note that ELF_NREG should be 29 as there should be place for
155 * TRAPNO and ERR "registers" as well but linux doesn't dump
156 * those.
157 *
158 * See linux kernel: arch/x86/include/asm/elf.h
159 */
160 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUState *env)
161 {
162 (*regs)[0] = env->regs[15];
163 (*regs)[1] = env->regs[14];
164 (*regs)[2] = env->regs[13];
165 (*regs)[3] = env->regs[12];
166 (*regs)[4] = env->regs[R_EBP];
167 (*regs)[5] = env->regs[R_EBX];
168 (*regs)[6] = env->regs[11];
169 (*regs)[7] = env->regs[10];
170 (*regs)[8] = env->regs[9];
171 (*regs)[9] = env->regs[8];
172 (*regs)[10] = env->regs[R_EAX];
173 (*regs)[11] = env->regs[R_ECX];
174 (*regs)[12] = env->regs[R_EDX];
175 (*regs)[13] = env->regs[R_ESI];
176 (*regs)[14] = env->regs[R_EDI];
177 (*regs)[15] = env->regs[R_EAX]; /* XXX */
178 (*regs)[16] = env->eip;
179 (*regs)[17] = env->segs[R_CS].selector & 0xffff;
180 (*regs)[18] = env->eflags;
181 (*regs)[19] = env->regs[R_ESP];
182 (*regs)[20] = env->segs[R_SS].selector & 0xffff;
183 (*regs)[21] = env->segs[R_FS].selector & 0xffff;
184 (*regs)[22] = env->segs[R_GS].selector & 0xffff;
185 (*regs)[23] = env->segs[R_DS].selector & 0xffff;
186 (*regs)[24] = env->segs[R_ES].selector & 0xffff;
187 (*regs)[25] = env->segs[R_FS].selector & 0xffff;
188 (*regs)[26] = env->segs[R_GS].selector & 0xffff;
189 }
190
191 #else
192
193 #define ELF_START_MMAP 0x80000000
194
195 /*
196 * This is used to ensure we don't load something for the wrong architecture.
197 */
198 #define elf_check_arch(x) ( ((x) == EM_386) || ((x) == EM_486) )
199
200 /*
201 * These are used to set parameters in the core dumps.
202 */
203 #define ELF_CLASS ELFCLASS32
204 #define ELF_ARCH EM_386
205
206 static inline void init_thread(struct target_pt_regs *regs,
207 struct image_info *infop)
208 {
209 regs->esp = infop->start_stack;
210 regs->eip = infop->entry;
211
212 /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program
213 starts %edx contains a pointer to a function which might be
214 registered using `atexit'. This provides a mean for the
215 dynamic linker to call DT_FINI functions for shared libraries
216 that have been loaded before the code runs.
217
218 A value of 0 tells we have no such handler. */
219 regs->edx = 0;
220 }
221
222 #define ELF_NREG 17
223 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
224
225 /*
226 * Note that ELF_NREG should be 19 as there should be place for
227 * TRAPNO and ERR "registers" as well but linux doesn't dump
228 * those.
229 *
230 * See linux kernel: arch/x86/include/asm/elf.h
231 */
232 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUState *env)
233 {
234 (*regs)[0] = env->regs[R_EBX];
235 (*regs)[1] = env->regs[R_ECX];
236 (*regs)[2] = env->regs[R_EDX];
237 (*regs)[3] = env->regs[R_ESI];
238 (*regs)[4] = env->regs[R_EDI];
239 (*regs)[5] = env->regs[R_EBP];
240 (*regs)[6] = env->regs[R_EAX];
241 (*regs)[7] = env->segs[R_DS].selector & 0xffff;
242 (*regs)[8] = env->segs[R_ES].selector & 0xffff;
243 (*regs)[9] = env->segs[R_FS].selector & 0xffff;
244 (*regs)[10] = env->segs[R_GS].selector & 0xffff;
245 (*regs)[11] = env->regs[R_EAX]; /* XXX */
246 (*regs)[12] = env->eip;
247 (*regs)[13] = env->segs[R_CS].selector & 0xffff;
248 (*regs)[14] = env->eflags;
249 (*regs)[15] = env->regs[R_ESP];
250 (*regs)[16] = env->segs[R_SS].selector & 0xffff;
251 }
252 #endif
253
254 #define USE_ELF_CORE_DUMP
255 #define ELF_EXEC_PAGESIZE 4096
256
257 #endif
258
259 #ifdef TARGET_ARM
260
261 #define ELF_START_MMAP 0x80000000
262
263 #define elf_check_arch(x) ( (x) == EM_ARM )
264
265 #define ELF_CLASS ELFCLASS32
266 #define ELF_ARCH EM_ARM
267
268 static inline void init_thread(struct target_pt_regs *regs,
269 struct image_info *infop)
270 {
271 abi_long stack = infop->start_stack;
272 memset(regs, 0, sizeof(*regs));
273 regs->ARM_cpsr = 0x10;
274 if (infop->entry & 1)
275 regs->ARM_cpsr |= CPSR_T;
276 regs->ARM_pc = infop->entry & 0xfffffffe;
277 regs->ARM_sp = infop->start_stack;
278 /* FIXME - what to for failure of get_user()? */
279 get_user_ual(regs->ARM_r2, stack + 8); /* envp */
280 get_user_ual(regs->ARM_r1, stack + 4); /* envp */
281 /* XXX: it seems that r0 is zeroed after ! */
282 regs->ARM_r0 = 0;
283 /* For uClinux PIC binaries. */
284 /* XXX: Linux does this only on ARM with no MMU (do we care ?) */
285 regs->ARM_r10 = infop->start_data;
286 }
287
288 #define ELF_NREG 18
289 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
290
291 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUState *env)
292 {
293 (*regs)[0] = tswapl(env->regs[0]);
294 (*regs)[1] = tswapl(env->regs[1]);
295 (*regs)[2] = tswapl(env->regs[2]);
296 (*regs)[3] = tswapl(env->regs[3]);
297 (*regs)[4] = tswapl(env->regs[4]);
298 (*regs)[5] = tswapl(env->regs[5]);
299 (*regs)[6] = tswapl(env->regs[6]);
300 (*regs)[7] = tswapl(env->regs[7]);
301 (*regs)[8] = tswapl(env->regs[8]);
302 (*regs)[9] = tswapl(env->regs[9]);
303 (*regs)[10] = tswapl(env->regs[10]);
304 (*regs)[11] = tswapl(env->regs[11]);
305 (*regs)[12] = tswapl(env->regs[12]);
306 (*regs)[13] = tswapl(env->regs[13]);
307 (*regs)[14] = tswapl(env->regs[14]);
308 (*regs)[15] = tswapl(env->regs[15]);
309
310 (*regs)[16] = tswapl(cpsr_read((CPUState *)env));
311 (*regs)[17] = tswapl(env->regs[0]); /* XXX */
312 }
313
314 #define USE_ELF_CORE_DUMP
315 #define ELF_EXEC_PAGESIZE 4096
316
317 enum
318 {
319 ARM_HWCAP_ARM_SWP = 1 << 0,
320 ARM_HWCAP_ARM_HALF = 1 << 1,
321 ARM_HWCAP_ARM_THUMB = 1 << 2,
322 ARM_HWCAP_ARM_26BIT = 1 << 3,
323 ARM_HWCAP_ARM_FAST_MULT = 1 << 4,
324 ARM_HWCAP_ARM_FPA = 1 << 5,
325 ARM_HWCAP_ARM_VFP = 1 << 6,
326 ARM_HWCAP_ARM_EDSP = 1 << 7,
327 ARM_HWCAP_ARM_JAVA = 1 << 8,
328 ARM_HWCAP_ARM_IWMMXT = 1 << 9,
329 ARM_HWCAP_ARM_THUMBEE = 1 << 10,
330 ARM_HWCAP_ARM_NEON = 1 << 11,
331 ARM_HWCAP_ARM_VFPv3 = 1 << 12,
332 ARM_HWCAP_ARM_VFPv3D16 = 1 << 13,
333 };
334
335 #define ELF_HWCAP (ARM_HWCAP_ARM_SWP | ARM_HWCAP_ARM_HALF \
336 | ARM_HWCAP_ARM_THUMB | ARM_HWCAP_ARM_FAST_MULT \
337 | ARM_HWCAP_ARM_FPA | ARM_HWCAP_ARM_VFP \
338 | ARM_HWCAP_ARM_NEON | ARM_HWCAP_ARM_VFPv3 )
339
340 #endif
341
342 #ifdef TARGET_UNICORE32
343
344 #define ELF_START_MMAP 0x80000000
345
346 #define elf_check_arch(x) ((x) == EM_UNICORE32)
347
348 #define ELF_CLASS ELFCLASS32
349 #define ELF_DATA ELFDATA2LSB
350 #define ELF_ARCH EM_UNICORE32
351
352 static inline void init_thread(struct target_pt_regs *regs,
353 struct image_info *infop)
354 {
355 abi_long stack = infop->start_stack;
356 memset(regs, 0, sizeof(*regs));
357 regs->UC32_REG_asr = 0x10;
358 regs->UC32_REG_pc = infop->entry & 0xfffffffe;
359 regs->UC32_REG_sp = infop->start_stack;
360 /* FIXME - what to for failure of get_user()? */
361 get_user_ual(regs->UC32_REG_02, stack + 8); /* envp */
362 get_user_ual(regs->UC32_REG_01, stack + 4); /* envp */
363 /* XXX: it seems that r0 is zeroed after ! */
364 regs->UC32_REG_00 = 0;
365 }
366
367 #define ELF_NREG 34
368 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
369
370 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUState *env)
371 {
372 (*regs)[0] = env->regs[0];
373 (*regs)[1] = env->regs[1];
374 (*regs)[2] = env->regs[2];
375 (*regs)[3] = env->regs[3];
376 (*regs)[4] = env->regs[4];
377 (*regs)[5] = env->regs[5];
378 (*regs)[6] = env->regs[6];
379 (*regs)[7] = env->regs[7];
380 (*regs)[8] = env->regs[8];
381 (*regs)[9] = env->regs[9];
382 (*regs)[10] = env->regs[10];
383 (*regs)[11] = env->regs[11];
384 (*regs)[12] = env->regs[12];
385 (*regs)[13] = env->regs[13];
386 (*regs)[14] = env->regs[14];
387 (*regs)[15] = env->regs[15];
388 (*regs)[16] = env->regs[16];
389 (*regs)[17] = env->regs[17];
390 (*regs)[18] = env->regs[18];
391 (*regs)[19] = env->regs[19];
392 (*regs)[20] = env->regs[20];
393 (*regs)[21] = env->regs[21];
394 (*regs)[22] = env->regs[22];
395 (*regs)[23] = env->regs[23];
396 (*regs)[24] = env->regs[24];
397 (*regs)[25] = env->regs[25];
398 (*regs)[26] = env->regs[26];
399 (*regs)[27] = env->regs[27];
400 (*regs)[28] = env->regs[28];
401 (*regs)[29] = env->regs[29];
402 (*regs)[30] = env->regs[30];
403 (*regs)[31] = env->regs[31];
404
405 (*regs)[32] = cpu_asr_read((CPUState *)env);
406 (*regs)[33] = env->regs[0]; /* XXX */
407 }
408
409 #define USE_ELF_CORE_DUMP
410 #define ELF_EXEC_PAGESIZE 4096
411
412 #define ELF_HWCAP (UC32_HWCAP_CMOV | UC32_HWCAP_UCF64)
413
414 #endif
415
416 #ifdef TARGET_SPARC
417 #ifdef TARGET_SPARC64
418
419 #define ELF_START_MMAP 0x80000000
420
421 #ifndef TARGET_ABI32
422 #define elf_check_arch(x) ( (x) == EM_SPARCV9 || (x) == EM_SPARC32PLUS )
423 #else
424 #define elf_check_arch(x) ( (x) == EM_SPARC32PLUS || (x) == EM_SPARC )
425 #endif
426
427 #define ELF_CLASS ELFCLASS64
428 #define ELF_ARCH EM_SPARCV9
429
430 #define STACK_BIAS 2047
431
432 static inline void init_thread(struct target_pt_regs *regs,
433 struct image_info *infop)
434 {
435 #ifndef TARGET_ABI32
436 regs->tstate = 0;
437 #endif
438 regs->pc = infop->entry;
439 regs->npc = regs->pc + 4;
440 regs->y = 0;
441 #ifdef TARGET_ABI32
442 regs->u_regs[14] = infop->start_stack - 16 * 4;
443 #else
444 if (personality(infop->personality) == PER_LINUX32)
445 regs->u_regs[14] = infop->start_stack - 16 * 4;
446 else
447 regs->u_regs[14] = infop->start_stack - 16 * 8 - STACK_BIAS;
448 #endif
449 }
450
451 #else
452 #define ELF_START_MMAP 0x80000000
453
454 #define elf_check_arch(x) ( (x) == EM_SPARC )
455
456 #define ELF_CLASS ELFCLASS32
457 #define ELF_ARCH EM_SPARC
458
459 static inline void init_thread(struct target_pt_regs *regs,
460 struct image_info *infop)
461 {
462 regs->psr = 0;
463 regs->pc = infop->entry;
464 regs->npc = regs->pc + 4;
465 regs->y = 0;
466 regs->u_regs[14] = infop->start_stack - 16 * 4;
467 }
468
469 #endif
470 #endif
471
472 #ifdef TARGET_PPC
473
474 #define ELF_START_MMAP 0x80000000
475
476 #if defined(TARGET_PPC64) && !defined(TARGET_ABI32)
477
478 #define elf_check_arch(x) ( (x) == EM_PPC64 )
479
480 #define ELF_CLASS ELFCLASS64
481
482 #else
483
484 #define elf_check_arch(x) ( (x) == EM_PPC )
485
486 #define ELF_CLASS ELFCLASS32
487
488 #endif
489
490 #define ELF_ARCH EM_PPC
491
492 /* Feature masks for the Aux Vector Hardware Capabilities (AT_HWCAP).
493 See arch/powerpc/include/asm/cputable.h. */
494 enum {
495 QEMU_PPC_FEATURE_32 = 0x80000000,
496 QEMU_PPC_FEATURE_64 = 0x40000000,
497 QEMU_PPC_FEATURE_601_INSTR = 0x20000000,
498 QEMU_PPC_FEATURE_HAS_ALTIVEC = 0x10000000,
499 QEMU_PPC_FEATURE_HAS_FPU = 0x08000000,
500 QEMU_PPC_FEATURE_HAS_MMU = 0x04000000,
501 QEMU_PPC_FEATURE_HAS_4xxMAC = 0x02000000,
502 QEMU_PPC_FEATURE_UNIFIED_CACHE = 0x01000000,
503 QEMU_PPC_FEATURE_HAS_SPE = 0x00800000,
504 QEMU_PPC_FEATURE_HAS_EFP_SINGLE = 0x00400000,
505 QEMU_PPC_FEATURE_HAS_EFP_DOUBLE = 0x00200000,
506 QEMU_PPC_FEATURE_NO_TB = 0x00100000,
507 QEMU_PPC_FEATURE_POWER4 = 0x00080000,
508 QEMU_PPC_FEATURE_POWER5 = 0x00040000,
509 QEMU_PPC_FEATURE_POWER5_PLUS = 0x00020000,
510 QEMU_PPC_FEATURE_CELL = 0x00010000,
511 QEMU_PPC_FEATURE_BOOKE = 0x00008000,
512 QEMU_PPC_FEATURE_SMT = 0x00004000,
513 QEMU_PPC_FEATURE_ICACHE_SNOOP = 0x00002000,
514 QEMU_PPC_FEATURE_ARCH_2_05 = 0x00001000,
515 QEMU_PPC_FEATURE_PA6T = 0x00000800,
516 QEMU_PPC_FEATURE_HAS_DFP = 0x00000400,
517 QEMU_PPC_FEATURE_POWER6_EXT = 0x00000200,
518 QEMU_PPC_FEATURE_ARCH_2_06 = 0x00000100,
519 QEMU_PPC_FEATURE_HAS_VSX = 0x00000080,
520 QEMU_PPC_FEATURE_PSERIES_PERFMON_COMPAT = 0x00000040,
521
522 QEMU_PPC_FEATURE_TRUE_LE = 0x00000002,
523 QEMU_PPC_FEATURE_PPC_LE = 0x00000001,
524 };
525
526 #define ELF_HWCAP get_elf_hwcap()
527
528 static uint32_t get_elf_hwcap(void)
529 {
530 CPUState *e = thread_env;
531 uint32_t features = 0;
532
533 /* We don't have to be terribly complete here; the high points are
534 Altivec/FP/SPE support. Anything else is just a bonus. */
535 #define GET_FEATURE(flag, feature) \
536 do {if (e->insns_flags & flag) features |= feature; } while(0)
537 GET_FEATURE(PPC_64B, QEMU_PPC_FEATURE_64);
538 GET_FEATURE(PPC_FLOAT, QEMU_PPC_FEATURE_HAS_FPU);
539 GET_FEATURE(PPC_ALTIVEC, QEMU_PPC_FEATURE_HAS_ALTIVEC);
540 GET_FEATURE(PPC_SPE, QEMU_PPC_FEATURE_HAS_SPE);
541 GET_FEATURE(PPC_SPE_SINGLE, QEMU_PPC_FEATURE_HAS_EFP_SINGLE);
542 GET_FEATURE(PPC_SPE_DOUBLE, QEMU_PPC_FEATURE_HAS_EFP_DOUBLE);
543 GET_FEATURE(PPC_BOOKE, QEMU_PPC_FEATURE_BOOKE);
544 GET_FEATURE(PPC_405_MAC, QEMU_PPC_FEATURE_HAS_4xxMAC);
545 #undef GET_FEATURE
546
547 return features;
548 }
549
550 /*
551 * The requirements here are:
552 * - keep the final alignment of sp (sp & 0xf)
553 * - make sure the 32-bit value at the first 16 byte aligned position of
554 * AUXV is greater than 16 for glibc compatibility.
555 * AT_IGNOREPPC is used for that.
556 * - for compatibility with glibc ARCH_DLINFO must always be defined on PPC,
557 * even if DLINFO_ARCH_ITEMS goes to zero or is undefined.
558 */
559 #define DLINFO_ARCH_ITEMS 5
560 #define ARCH_DLINFO \
561 do { \
562 NEW_AUX_ENT(AT_DCACHEBSIZE, 0x20); \
563 NEW_AUX_ENT(AT_ICACHEBSIZE, 0x20); \
564 NEW_AUX_ENT(AT_UCACHEBSIZE, 0); \
565 /* \
566 * Now handle glibc compatibility. \
567 */ \
568 NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \
569 NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \
570 } while (0)
571
572 static inline void init_thread(struct target_pt_regs *_regs, struct image_info *infop)
573 {
574 _regs->gpr[1] = infop->start_stack;
575 #if defined(TARGET_PPC64) && !defined(TARGET_ABI32)
576 _regs->gpr[2] = ldq_raw(infop->entry + 8) + infop->load_addr;
577 infop->entry = ldq_raw(infop->entry) + infop->load_addr;
578 #endif
579 _regs->nip = infop->entry;
580 }
581
582 /* See linux kernel: arch/powerpc/include/asm/elf.h. */
583 #define ELF_NREG 48
584 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
585
586 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUState *env)
587 {
588 int i;
589 target_ulong ccr = 0;
590
591 for (i = 0; i < ARRAY_SIZE(env->gpr); i++) {
592 (*regs)[i] = tswapl(env->gpr[i]);
593 }
594
595 (*regs)[32] = tswapl(env->nip);
596 (*regs)[33] = tswapl(env->msr);
597 (*regs)[35] = tswapl(env->ctr);
598 (*regs)[36] = tswapl(env->lr);
599 (*regs)[37] = tswapl(env->xer);
600
601 for (i = 0; i < ARRAY_SIZE(env->crf); i++) {
602 ccr |= env->crf[i] << (32 - ((i + 1) * 4));
603 }
604 (*regs)[38] = tswapl(ccr);
605 }
606
607 #define USE_ELF_CORE_DUMP
608 #define ELF_EXEC_PAGESIZE 4096
609
610 #endif
611
612 #ifdef TARGET_MIPS
613
614 #define ELF_START_MMAP 0x80000000
615
616 #define elf_check_arch(x) ( (x) == EM_MIPS )
617
618 #ifdef TARGET_MIPS64
619 #define ELF_CLASS ELFCLASS64
620 #else
621 #define ELF_CLASS ELFCLASS32
622 #endif
623 #define ELF_ARCH EM_MIPS
624
625 static inline void init_thread(struct target_pt_regs *regs,
626 struct image_info *infop)
627 {
628 regs->cp0_status = 2 << CP0St_KSU;
629 regs->cp0_epc = infop->entry;
630 regs->regs[29] = infop->start_stack;
631 }
632
633 /* See linux kernel: arch/mips/include/asm/elf.h. */
634 #define ELF_NREG 45
635 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
636
637 /* See linux kernel: arch/mips/include/asm/reg.h. */
638 enum {
639 #ifdef TARGET_MIPS64
640 TARGET_EF_R0 = 0,
641 #else
642 TARGET_EF_R0 = 6,
643 #endif
644 TARGET_EF_R26 = TARGET_EF_R0 + 26,
645 TARGET_EF_R27 = TARGET_EF_R0 + 27,
646 TARGET_EF_LO = TARGET_EF_R0 + 32,
647 TARGET_EF_HI = TARGET_EF_R0 + 33,
648 TARGET_EF_CP0_EPC = TARGET_EF_R0 + 34,
649 TARGET_EF_CP0_BADVADDR = TARGET_EF_R0 + 35,
650 TARGET_EF_CP0_STATUS = TARGET_EF_R0 + 36,
651 TARGET_EF_CP0_CAUSE = TARGET_EF_R0 + 37
652 };
653
654 /* See linux kernel: arch/mips/kernel/process.c:elf_dump_regs. */
655 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUState *env)
656 {
657 int i;
658
659 for (i = 0; i < TARGET_EF_R0; i++) {
660 (*regs)[i] = 0;
661 }
662 (*regs)[TARGET_EF_R0] = 0;
663
664 for (i = 1; i < ARRAY_SIZE(env->active_tc.gpr); i++) {
665 (*regs)[TARGET_EF_R0 + i] = tswapl(env->active_tc.gpr[i]);
666 }
667
668 (*regs)[TARGET_EF_R26] = 0;
669 (*regs)[TARGET_EF_R27] = 0;
670 (*regs)[TARGET_EF_LO] = tswapl(env->active_tc.LO[0]);
671 (*regs)[TARGET_EF_HI] = tswapl(env->active_tc.HI[0]);
672 (*regs)[TARGET_EF_CP0_EPC] = tswapl(env->active_tc.PC);
673 (*regs)[TARGET_EF_CP0_BADVADDR] = tswapl(env->CP0_BadVAddr);
674 (*regs)[TARGET_EF_CP0_STATUS] = tswapl(env->CP0_Status);
675 (*regs)[TARGET_EF_CP0_CAUSE] = tswapl(env->CP0_Cause);
676 }
677
678 #define USE_ELF_CORE_DUMP
679 #define ELF_EXEC_PAGESIZE 4096
680
681 #endif /* TARGET_MIPS */
682
683 #ifdef TARGET_MICROBLAZE
684
685 #define ELF_START_MMAP 0x80000000
686
687 #define elf_check_arch(x) ( (x) == EM_MICROBLAZE || (x) == EM_MICROBLAZE_OLD)
688
689 #define ELF_CLASS ELFCLASS32
690 #define ELF_ARCH EM_MICROBLAZE
691
692 static inline void init_thread(struct target_pt_regs *regs,
693 struct image_info *infop)
694 {
695 regs->pc = infop->entry;
696 regs->r1 = infop->start_stack;
697
698 }
699
700 #define ELF_EXEC_PAGESIZE 4096
701
702 #define USE_ELF_CORE_DUMP
703 #define ELF_NREG 38
704 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
705
706 /* See linux kernel: arch/mips/kernel/process.c:elf_dump_regs. */
707 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUState *env)
708 {
709 int i, pos = 0;
710
711 for (i = 0; i < 32; i++) {
712 (*regs)[pos++] = tswapl(env->regs[i]);
713 }
714
715 for (i = 0; i < 6; i++) {
716 (*regs)[pos++] = tswapl(env->sregs[i]);
717 }
718 }
719
720 #endif /* TARGET_MICROBLAZE */
721
722 #ifdef TARGET_SH4
723
724 #define ELF_START_MMAP 0x80000000
725
726 #define elf_check_arch(x) ( (x) == EM_SH )
727
728 #define ELF_CLASS ELFCLASS32
729 #define ELF_ARCH EM_SH
730
731 static inline void init_thread(struct target_pt_regs *regs,
732 struct image_info *infop)
733 {
734 /* Check other registers XXXXX */
735 regs->pc = infop->entry;
736 regs->regs[15] = infop->start_stack;
737 }
738
739 /* See linux kernel: arch/sh/include/asm/elf.h. */
740 #define ELF_NREG 23
741 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
742
743 /* See linux kernel: arch/sh/include/asm/ptrace.h. */
744 enum {
745 TARGET_REG_PC = 16,
746 TARGET_REG_PR = 17,
747 TARGET_REG_SR = 18,
748 TARGET_REG_GBR = 19,
749 TARGET_REG_MACH = 20,
750 TARGET_REG_MACL = 21,
751 TARGET_REG_SYSCALL = 22
752 };
753
754 static inline void elf_core_copy_regs(target_elf_gregset_t *regs,
755 const CPUState *env)
756 {
757 int i;
758
759 for (i = 0; i < 16; i++) {
760 (*regs[i]) = tswapl(env->gregs[i]);
761 }
762
763 (*regs)[TARGET_REG_PC] = tswapl(env->pc);
764 (*regs)[TARGET_REG_PR] = tswapl(env->pr);
765 (*regs)[TARGET_REG_SR] = tswapl(env->sr);
766 (*regs)[TARGET_REG_GBR] = tswapl(env->gbr);
767 (*regs)[TARGET_REG_MACH] = tswapl(env->mach);
768 (*regs)[TARGET_REG_MACL] = tswapl(env->macl);
769 (*regs)[TARGET_REG_SYSCALL] = 0; /* FIXME */
770 }
771
772 #define USE_ELF_CORE_DUMP
773 #define ELF_EXEC_PAGESIZE 4096
774
775 #endif
776
777 #ifdef TARGET_CRIS
778
779 #define ELF_START_MMAP 0x80000000
780
781 #define elf_check_arch(x) ( (x) == EM_CRIS )
782
783 #define ELF_CLASS ELFCLASS32
784 #define ELF_ARCH EM_CRIS
785
786 static inline void init_thread(struct target_pt_regs *regs,
787 struct image_info *infop)
788 {
789 regs->erp = infop->entry;
790 }
791
792 #define ELF_EXEC_PAGESIZE 8192
793
794 #endif
795
796 #ifdef TARGET_M68K
797
798 #define ELF_START_MMAP 0x80000000
799
800 #define elf_check_arch(x) ( (x) == EM_68K )
801
802 #define ELF_CLASS ELFCLASS32
803 #define ELF_ARCH EM_68K
804
805 /* ??? Does this need to do anything?
806 #define ELF_PLAT_INIT(_r) */
807
808 static inline void init_thread(struct target_pt_regs *regs,
809 struct image_info *infop)
810 {
811 regs->usp = infop->start_stack;
812 regs->sr = 0;
813 regs->pc = infop->entry;
814 }
815
816 /* See linux kernel: arch/m68k/include/asm/elf.h. */
817 #define ELF_NREG 20
818 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
819
820 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUState *env)
821 {
822 (*regs)[0] = tswapl(env->dregs[1]);
823 (*regs)[1] = tswapl(env->dregs[2]);
824 (*regs)[2] = tswapl(env->dregs[3]);
825 (*regs)[3] = tswapl(env->dregs[4]);
826 (*regs)[4] = tswapl(env->dregs[5]);
827 (*regs)[5] = tswapl(env->dregs[6]);
828 (*regs)[6] = tswapl(env->dregs[7]);
829 (*regs)[7] = tswapl(env->aregs[0]);
830 (*regs)[8] = tswapl(env->aregs[1]);
831 (*regs)[9] = tswapl(env->aregs[2]);
832 (*regs)[10] = tswapl(env->aregs[3]);
833 (*regs)[11] = tswapl(env->aregs[4]);
834 (*regs)[12] = tswapl(env->aregs[5]);
835 (*regs)[13] = tswapl(env->aregs[6]);
836 (*regs)[14] = tswapl(env->dregs[0]);
837 (*regs)[15] = tswapl(env->aregs[7]);
838 (*regs)[16] = tswapl(env->dregs[0]); /* FIXME: orig_d0 */
839 (*regs)[17] = tswapl(env->sr);
840 (*regs)[18] = tswapl(env->pc);
841 (*regs)[19] = 0; /* FIXME: regs->format | regs->vector */
842 }
843
844 #define USE_ELF_CORE_DUMP
845 #define ELF_EXEC_PAGESIZE 8192
846
847 #endif
848
849 #ifdef TARGET_ALPHA
850
851 #define ELF_START_MMAP (0x30000000000ULL)
852
853 #define elf_check_arch(x) ( (x) == ELF_ARCH )
854
855 #define ELF_CLASS ELFCLASS64
856 #define ELF_ARCH EM_ALPHA
857
858 static inline void init_thread(struct target_pt_regs *regs,
859 struct image_info *infop)
860 {
861 regs->pc = infop->entry;
862 regs->ps = 8;
863 regs->usp = infop->start_stack;
864 }
865
866 #define ELF_EXEC_PAGESIZE 8192
867
868 #endif /* TARGET_ALPHA */
869
870 #ifdef TARGET_S390X
871
872 #define ELF_START_MMAP (0x20000000000ULL)
873
874 #define elf_check_arch(x) ( (x) == ELF_ARCH )
875
876 #define ELF_CLASS ELFCLASS64
877 #define ELF_DATA ELFDATA2MSB
878 #define ELF_ARCH EM_S390
879
880 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
881 {
882 regs->psw.addr = infop->entry;
883 regs->psw.mask = PSW_MASK_64 | PSW_MASK_32;
884 regs->gprs[15] = infop->start_stack;
885 }
886
887 #endif /* TARGET_S390X */
888
889 #ifndef ELF_PLATFORM
890 #define ELF_PLATFORM (NULL)
891 #endif
892
893 #ifndef ELF_HWCAP
894 #define ELF_HWCAP 0
895 #endif
896
897 #ifdef TARGET_ABI32
898 #undef ELF_CLASS
899 #define ELF_CLASS ELFCLASS32
900 #undef bswaptls
901 #define bswaptls(ptr) bswap32s(ptr)
902 #endif
903
904 #include "elf.h"
905
906 struct exec
907 {
908 unsigned int a_info; /* Use macros N_MAGIC, etc for access */
909 unsigned int a_text; /* length of text, in bytes */
910 unsigned int a_data; /* length of data, in bytes */
911 unsigned int a_bss; /* length of uninitialized data area, in bytes */
912 unsigned int a_syms; /* length of symbol table data in file, in bytes */
913 unsigned int a_entry; /* start address */
914 unsigned int a_trsize; /* length of relocation info for text, in bytes */
915 unsigned int a_drsize; /* length of relocation info for data, in bytes */
916 };
917
918
919 #define N_MAGIC(exec) ((exec).a_info & 0xffff)
920 #define OMAGIC 0407
921 #define NMAGIC 0410
922 #define ZMAGIC 0413
923 #define QMAGIC 0314
924
925 /* Necessary parameters */
926 #define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE
927 #define TARGET_ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE-1))
928 #define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE-1))
929
930 #define DLINFO_ITEMS 12
931
932 static inline void memcpy_fromfs(void * to, const void * from, unsigned long n)
933 {
934 memcpy(to, from, n);
935 }
936
937 #ifdef BSWAP_NEEDED
938 static void bswap_ehdr(struct elfhdr *ehdr)
939 {
940 bswap16s(&ehdr->e_type); /* Object file type */
941 bswap16s(&ehdr->e_machine); /* Architecture */
942 bswap32s(&ehdr->e_version); /* Object file version */
943 bswaptls(&ehdr->e_entry); /* Entry point virtual address */
944 bswaptls(&ehdr->e_phoff); /* Program header table file offset */
945 bswaptls(&ehdr->e_shoff); /* Section header table file offset */
946 bswap32s(&ehdr->e_flags); /* Processor-specific flags */
947 bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */
948 bswap16s(&ehdr->e_phentsize); /* Program header table entry size */
949 bswap16s(&ehdr->e_phnum); /* Program header table entry count */
950 bswap16s(&ehdr->e_shentsize); /* Section header table entry size */
951 bswap16s(&ehdr->e_shnum); /* Section header table entry count */
952 bswap16s(&ehdr->e_shstrndx); /* Section header string table index */
953 }
954
955 static void bswap_phdr(struct elf_phdr *phdr, int phnum)
956 {
957 int i;
958 for (i = 0; i < phnum; ++i, ++phdr) {
959 bswap32s(&phdr->p_type); /* Segment type */
960 bswap32s(&phdr->p_flags); /* Segment flags */
961 bswaptls(&phdr->p_offset); /* Segment file offset */
962 bswaptls(&phdr->p_vaddr); /* Segment virtual address */
963 bswaptls(&phdr->p_paddr); /* Segment physical address */
964 bswaptls(&phdr->p_filesz); /* Segment size in file */
965 bswaptls(&phdr->p_memsz); /* Segment size in memory */
966 bswaptls(&phdr->p_align); /* Segment alignment */
967 }
968 }
969
970 static void bswap_shdr(struct elf_shdr *shdr, int shnum)
971 {
972 int i;
973 for (i = 0; i < shnum; ++i, ++shdr) {
974 bswap32s(&shdr->sh_name);
975 bswap32s(&shdr->sh_type);
976 bswaptls(&shdr->sh_flags);
977 bswaptls(&shdr->sh_addr);
978 bswaptls(&shdr->sh_offset);
979 bswaptls(&shdr->sh_size);
980 bswap32s(&shdr->sh_link);
981 bswap32s(&shdr->sh_info);
982 bswaptls(&shdr->sh_addralign);
983 bswaptls(&shdr->sh_entsize);
984 }
985 }
986
987 static void bswap_sym(struct elf_sym *sym)
988 {
989 bswap32s(&sym->st_name);
990 bswaptls(&sym->st_value);
991 bswaptls(&sym->st_size);
992 bswap16s(&sym->st_shndx);
993 }
994 #else
995 static inline void bswap_ehdr(struct elfhdr *ehdr) { }
996 static inline void bswap_phdr(struct elf_phdr *phdr, int phnum) { }
997 static inline void bswap_shdr(struct elf_shdr *shdr, int shnum) { }
998 static inline void bswap_sym(struct elf_sym *sym) { }
999 #endif
1000
1001 #ifdef USE_ELF_CORE_DUMP
1002 static int elf_core_dump(int, const CPUState *);
1003 #endif /* USE_ELF_CORE_DUMP */
1004 static void load_symbols(struct elfhdr *hdr, int fd, abi_ulong load_bias);
1005
1006 /* Verify the portions of EHDR within E_IDENT for the target.
1007 This can be performed before bswapping the entire header. */
1008 static bool elf_check_ident(struct elfhdr *ehdr)
1009 {
1010 return (ehdr->e_ident[EI_MAG0] == ELFMAG0
1011 && ehdr->e_ident[EI_MAG1] == ELFMAG1
1012 && ehdr->e_ident[EI_MAG2] == ELFMAG2
1013 && ehdr->e_ident[EI_MAG3] == ELFMAG3
1014 && ehdr->e_ident[EI_CLASS] == ELF_CLASS
1015 && ehdr->e_ident[EI_DATA] == ELF_DATA
1016 && ehdr->e_ident[EI_VERSION] == EV_CURRENT);
1017 }
1018
1019 /* Verify the portions of EHDR outside of E_IDENT for the target.
1020 This has to wait until after bswapping the header. */
1021 static bool elf_check_ehdr(struct elfhdr *ehdr)
1022 {
1023 return (elf_check_arch(ehdr->e_machine)
1024 && ehdr->e_ehsize == sizeof(struct elfhdr)
1025 && ehdr->e_phentsize == sizeof(struct elf_phdr)
1026 && ehdr->e_shentsize == sizeof(struct elf_shdr)
1027 && (ehdr->e_type == ET_EXEC || ehdr->e_type == ET_DYN));
1028 }
1029
1030 /*
1031 * 'copy_elf_strings()' copies argument/envelope strings from user
1032 * memory to free pages in kernel mem. These are in a format ready
1033 * to be put directly into the top of new user memory.
1034 *
1035 */
1036 static abi_ulong copy_elf_strings(int argc,char ** argv, void **page,
1037 abi_ulong p)
1038 {
1039 char *tmp, *tmp1, *pag = NULL;
1040 int len, offset = 0;
1041
1042 if (!p) {
1043 return 0; /* bullet-proofing */
1044 }
1045 while (argc-- > 0) {
1046 tmp = argv[argc];
1047 if (!tmp) {
1048 fprintf(stderr, "VFS: argc is wrong");
1049 exit(-1);
1050 }
1051 tmp1 = tmp;
1052 while (*tmp++);
1053 len = tmp - tmp1;
1054 if (p < len) { /* this shouldn't happen - 128kB */
1055 return 0;
1056 }
1057 while (len) {
1058 --p; --tmp; --len;
1059 if (--offset < 0) {
1060 offset = p % TARGET_PAGE_SIZE;
1061 pag = (char *)page[p/TARGET_PAGE_SIZE];
1062 if (!pag) {
1063 pag = (char *)malloc(TARGET_PAGE_SIZE);
1064 memset(pag, 0, TARGET_PAGE_SIZE);
1065 page[p/TARGET_PAGE_SIZE] = pag;
1066 if (!pag)
1067 return 0;
1068 }
1069 }
1070 if (len == 0 || offset == 0) {
1071 *(pag + offset) = *tmp;
1072 }
1073 else {
1074 int bytes_to_copy = (len > offset) ? offset : len;
1075 tmp -= bytes_to_copy;
1076 p -= bytes_to_copy;
1077 offset -= bytes_to_copy;
1078 len -= bytes_to_copy;
1079 memcpy_fromfs(pag + offset, tmp, bytes_to_copy + 1);
1080 }
1081 }
1082 }
1083 return p;
1084 }
1085
1086 static abi_ulong setup_arg_pages(abi_ulong p, struct linux_binprm *bprm,
1087 struct image_info *info)
1088 {
1089 abi_ulong stack_base, size, error, guard;
1090 int i;
1091
1092 /* Create enough stack to hold everything. If we don't use
1093 it for args, we'll use it for something else. */
1094 size = guest_stack_size;
1095 if (size < MAX_ARG_PAGES*TARGET_PAGE_SIZE) {
1096 size = MAX_ARG_PAGES*TARGET_PAGE_SIZE;
1097 }
1098 guard = TARGET_PAGE_SIZE;
1099 if (guard < qemu_real_host_page_size) {
1100 guard = qemu_real_host_page_size;
1101 }
1102
1103 error = target_mmap(0, size + guard, PROT_READ | PROT_WRITE,
1104 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
1105 if (error == -1) {
1106 perror("mmap stack");
1107 exit(-1);
1108 }
1109
1110 /* We reserve one extra page at the top of the stack as guard. */
1111 target_mprotect(error, guard, PROT_NONE);
1112
1113 info->stack_limit = error + guard;
1114 stack_base = info->stack_limit + size - MAX_ARG_PAGES*TARGET_PAGE_SIZE;
1115 p += stack_base;
1116
1117 for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
1118 if (bprm->page[i]) {
1119 info->rss++;
1120 /* FIXME - check return value of memcpy_to_target() for failure */
1121 memcpy_to_target(stack_base, bprm->page[i], TARGET_PAGE_SIZE);
1122 free(bprm->page[i]);
1123 }
1124 stack_base += TARGET_PAGE_SIZE;
1125 }
1126 return p;
1127 }
1128
1129 /* Map and zero the bss. We need to explicitly zero any fractional pages
1130 after the data section (i.e. bss). */
1131 static void zero_bss(abi_ulong elf_bss, abi_ulong last_bss, int prot)
1132 {
1133 uintptr_t host_start, host_map_start, host_end;
1134
1135 last_bss = TARGET_PAGE_ALIGN(last_bss);
1136
1137 /* ??? There is confusion between qemu_real_host_page_size and
1138 qemu_host_page_size here and elsewhere in target_mmap, which
1139 may lead to the end of the data section mapping from the file
1140 not being mapped. At least there was an explicit test and
1141 comment for that here, suggesting that "the file size must
1142 be known". The comment probably pre-dates the introduction
1143 of the fstat system call in target_mmap which does in fact
1144 find out the size. What isn't clear is if the workaround
1145 here is still actually needed. For now, continue with it,
1146 but merge it with the "normal" mmap that would allocate the bss. */
1147
1148 host_start = (uintptr_t) g2h(elf_bss);
1149 host_end = (uintptr_t) g2h(last_bss);
1150 host_map_start = (host_start + qemu_real_host_page_size - 1);
1151 host_map_start &= -qemu_real_host_page_size;
1152
1153 if (host_map_start < host_end) {
1154 void *p = mmap((void *)host_map_start, host_end - host_map_start,
1155 prot, MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
1156 if (p == MAP_FAILED) {
1157 perror("cannot mmap brk");
1158 exit(-1);
1159 }
1160
1161 /* Since we didn't use target_mmap, make sure to record
1162 the validity of the pages with qemu. */
1163 page_set_flags(elf_bss & TARGET_PAGE_MASK, last_bss, prot|PAGE_VALID);
1164 }
1165
1166 if (host_start < host_map_start) {
1167 memset((void *)host_start, 0, host_map_start - host_start);
1168 }
1169 }
1170
1171 #ifdef CONFIG_USE_FDPIC
1172 static abi_ulong loader_build_fdpic_loadmap(struct image_info *info, abi_ulong sp)
1173 {
1174 uint16_t n;
1175 struct elf32_fdpic_loadseg *loadsegs = info->loadsegs;
1176
1177 /* elf32_fdpic_loadseg */
1178 n = info->nsegs;
1179 while (n--) {
1180 sp -= 12;
1181 put_user_u32(loadsegs[n].addr, sp+0);
1182 put_user_u32(loadsegs[n].p_vaddr, sp+4);
1183 put_user_u32(loadsegs[n].p_memsz, sp+8);
1184 }
1185
1186 /* elf32_fdpic_loadmap */
1187 sp -= 4;
1188 put_user_u16(0, sp+0); /* version */
1189 put_user_u16(info->nsegs, sp+2); /* nsegs */
1190
1191 info->personality = PER_LINUX_FDPIC;
1192 info->loadmap_addr = sp;
1193
1194 return sp;
1195 }
1196 #endif
1197
1198 static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
1199 struct elfhdr *exec,
1200 struct image_info *info,
1201 struct image_info *interp_info)
1202 {
1203 abi_ulong sp;
1204 int size;
1205 abi_ulong u_platform;
1206 const char *k_platform;
1207 const int n = sizeof(elf_addr_t);
1208
1209 sp = p;
1210
1211 #ifdef CONFIG_USE_FDPIC
1212 /* Needs to be before we load the env/argc/... */
1213 if (elf_is_fdpic(exec)) {
1214 /* Need 4 byte alignment for these structs */
1215 sp &= ~3;
1216 sp = loader_build_fdpic_loadmap(info, sp);
1217 info->other_info = interp_info;
1218 if (interp_info) {
1219 interp_info->other_info = info;
1220 sp = loader_build_fdpic_loadmap(interp_info, sp);
1221 }
1222 }
1223 #endif
1224
1225 u_platform = 0;
1226 k_platform = ELF_PLATFORM;
1227 if (k_platform) {
1228 size_t len = strlen(k_platform) + 1;
1229 sp -= (len + n - 1) & ~(n - 1);
1230 u_platform = sp;
1231 /* FIXME - check return value of memcpy_to_target() for failure */
1232 memcpy_to_target(sp, k_platform, len);
1233 }
1234 /*
1235 * Force 16 byte _final_ alignment here for generality.
1236 */
1237 sp = sp &~ (abi_ulong)15;
1238 size = (DLINFO_ITEMS + 1) * 2;
1239 if (k_platform)
1240 size += 2;
1241 #ifdef DLINFO_ARCH_ITEMS
1242 size += DLINFO_ARCH_ITEMS * 2;
1243 #endif
1244 size += envc + argc + 2;
1245 size += 1; /* argc itself */
1246 size *= n;
1247 if (size & 15)
1248 sp -= 16 - (size & 15);
1249
1250 /* This is correct because Linux defines
1251 * elf_addr_t as Elf32_Off / Elf64_Off
1252 */
1253 #define NEW_AUX_ENT(id, val) do { \
1254 sp -= n; put_user_ual(val, sp); \
1255 sp -= n; put_user_ual(id, sp); \
1256 } while(0)
1257
1258 NEW_AUX_ENT (AT_NULL, 0);
1259
1260 /* There must be exactly DLINFO_ITEMS entries here. */
1261 NEW_AUX_ENT(AT_PHDR, (abi_ulong)(info->load_addr + exec->e_phoff));
1262 NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof (struct elf_phdr)));
1263 NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum));
1264 NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(TARGET_PAGE_SIZE));
1265 NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_info ? interp_info->load_addr : 0));
1266 NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0);
1267 NEW_AUX_ENT(AT_ENTRY, info->entry);
1268 NEW_AUX_ENT(AT_UID, (abi_ulong) getuid());
1269 NEW_AUX_ENT(AT_EUID, (abi_ulong) geteuid());
1270 NEW_AUX_ENT(AT_GID, (abi_ulong) getgid());
1271 NEW_AUX_ENT(AT_EGID, (abi_ulong) getegid());
1272 NEW_AUX_ENT(AT_HWCAP, (abi_ulong) ELF_HWCAP);
1273 NEW_AUX_ENT(AT_CLKTCK, (abi_ulong) sysconf(_SC_CLK_TCK));
1274 if (k_platform)
1275 NEW_AUX_ENT(AT_PLATFORM, u_platform);
1276 #ifdef ARCH_DLINFO
1277 /*
1278 * ARCH_DLINFO must come last so platform specific code can enforce
1279 * special alignment requirements on the AUXV if necessary (eg. PPC).
1280 */
1281 ARCH_DLINFO;
1282 #endif
1283 #undef NEW_AUX_ENT
1284
1285 info->saved_auxv = sp;
1286
1287 sp = loader_build_argptr(envc, argc, sp, p, 0);
1288 return sp;
1289 }
1290
1291 static void probe_guest_base(const char *image_name,
1292 abi_ulong loaddr, abi_ulong hiaddr)
1293 {
1294 /* Probe for a suitable guest base address, if the user has not set
1295 * it explicitly, and set guest_base appropriately.
1296 * In case of error we will print a suitable message and exit.
1297 */
1298 #if defined(CONFIG_USE_GUEST_BASE)
1299 const char *errmsg;
1300 if (!have_guest_base && !reserved_va) {
1301 unsigned long host_start, real_start, host_size;
1302
1303 /* Round addresses to page boundaries. */
1304 loaddr &= qemu_host_page_mask;
1305 hiaddr = HOST_PAGE_ALIGN(hiaddr);
1306
1307 if (loaddr < mmap_min_addr) {
1308 host_start = HOST_PAGE_ALIGN(mmap_min_addr);
1309 } else {
1310 host_start = loaddr;
1311 if (host_start != loaddr) {
1312 errmsg = "Address overflow loading ELF binary";
1313 goto exit_errmsg;
1314 }
1315 }
1316 host_size = hiaddr - loaddr;
1317 while (1) {
1318 /* Do not use mmap_find_vma here because that is limited to the
1319 guest address space. We are going to make the
1320 guest address space fit whatever we're given. */
1321 real_start = (unsigned long)
1322 mmap((void *)host_start, host_size, PROT_NONE,
1323 MAP_ANONYMOUS | MAP_PRIVATE | MAP_NORESERVE, -1, 0);
1324 if (real_start == (unsigned long)-1) {
1325 goto exit_perror;
1326 }
1327 if (real_start == host_start) {
1328 break;
1329 }
1330 /* That address didn't work. Unmap and try a different one.
1331 The address the host picked because is typically right at
1332 the top of the host address space and leaves the guest with
1333 no usable address space. Resort to a linear search. We
1334 already compensated for mmap_min_addr, so this should not
1335 happen often. Probably means we got unlucky and host
1336 address space randomization put a shared library somewhere
1337 inconvenient. */
1338 munmap((void *)real_start, host_size);
1339 host_start += qemu_host_page_size;
1340 if (host_start == loaddr) {
1341 /* Theoretically possible if host doesn't have any suitably
1342 aligned areas. Normally the first mmap will fail. */
1343 errmsg = "Unable to find space for application";
1344 goto exit_errmsg;
1345 }
1346 }
1347 qemu_log("Relocating guest address space from 0x"
1348 TARGET_ABI_FMT_lx " to 0x%lx\n",
1349 loaddr, real_start);
1350 guest_base = real_start - loaddr;
1351 }
1352 return;
1353
1354 exit_perror:
1355 errmsg = strerror(errno);
1356 exit_errmsg:
1357 fprintf(stderr, "%s: %s\n", image_name, errmsg);
1358 exit(-1);
1359 #endif
1360 }
1361
1362
1363 /* Load an ELF image into the address space.
1364
1365 IMAGE_NAME is the filename of the image, to use in error messages.
1366 IMAGE_FD is the open file descriptor for the image.
1367
1368 BPRM_BUF is a copy of the beginning of the file; this of course
1369 contains the elf file header at offset 0. It is assumed that this
1370 buffer is sufficiently aligned to present no problems to the host
1371 in accessing data at aligned offsets within the buffer.
1372
1373 On return: INFO values will be filled in, as necessary or available. */
1374
1375 static void load_elf_image(const char *image_name, int image_fd,
1376 struct image_info *info, char **pinterp_name,
1377 char bprm_buf[BPRM_BUF_SIZE])
1378 {
1379 struct elfhdr *ehdr = (struct elfhdr *)bprm_buf;
1380 struct elf_phdr *phdr;
1381 abi_ulong load_addr, load_bias, loaddr, hiaddr, error;
1382 int i, retval;
1383 const char *errmsg;
1384
1385 /* First of all, some simple consistency checks */
1386 errmsg = "Invalid ELF image for this architecture";
1387 if (!elf_check_ident(ehdr)) {
1388 goto exit_errmsg;
1389 }
1390 bswap_ehdr(ehdr);
1391 if (!elf_check_ehdr(ehdr)) {
1392 goto exit_errmsg;
1393 }
1394
1395 i = ehdr->e_phnum * sizeof(struct elf_phdr);
1396 if (ehdr->e_phoff + i <= BPRM_BUF_SIZE) {
1397 phdr = (struct elf_phdr *)(bprm_buf + ehdr->e_phoff);
1398 } else {
1399 phdr = (struct elf_phdr *) alloca(i);
1400 retval = pread(image_fd, phdr, i, ehdr->e_phoff);
1401 if (retval != i) {
1402 goto exit_read;
1403 }
1404 }
1405 bswap_phdr(phdr, ehdr->e_phnum);
1406
1407 #ifdef CONFIG_USE_FDPIC
1408 info->nsegs = 0;
1409 info->pt_dynamic_addr = 0;
1410 #endif
1411
1412 /* Find the maximum size of the image and allocate an appropriate
1413 amount of memory to handle that. */
1414 loaddr = -1, hiaddr = 0;
1415 for (i = 0; i < ehdr->e_phnum; ++i) {
1416 if (phdr[i].p_type == PT_LOAD) {
1417 abi_ulong a = phdr[i].p_vaddr;
1418 if (a < loaddr) {
1419 loaddr = a;
1420 }
1421 a += phdr[i].p_memsz;
1422 if (a > hiaddr) {
1423 hiaddr = a;
1424 }
1425 #ifdef CONFIG_USE_FDPIC
1426 ++info->nsegs;
1427 #endif
1428 }
1429 }
1430
1431 load_addr = loaddr;
1432 if (ehdr->e_type == ET_DYN) {
1433 /* The image indicates that it can be loaded anywhere. Find a
1434 location that can hold the memory space required. If the
1435 image is pre-linked, LOADDR will be non-zero. Since we do
1436 not supply MAP_FIXED here we'll use that address if and
1437 only if it remains available. */
1438 load_addr = target_mmap(loaddr, hiaddr - loaddr, PROT_NONE,
1439 MAP_PRIVATE | MAP_ANON | MAP_NORESERVE,
1440 -1, 0);
1441 if (load_addr == -1) {
1442 goto exit_perror;
1443 }
1444 } else if (pinterp_name != NULL) {
1445 /* This is the main executable. Make sure that the low
1446 address does not conflict with MMAP_MIN_ADDR or the
1447 QEMU application itself. */
1448 probe_guest_base(image_name, loaddr, hiaddr);
1449 }
1450 load_bias = load_addr - loaddr;
1451
1452 #ifdef CONFIG_USE_FDPIC
1453 {
1454 struct elf32_fdpic_loadseg *loadsegs = info->loadsegs =
1455 qemu_malloc(sizeof(*loadsegs) * info->nsegs);
1456
1457 for (i = 0; i < ehdr->e_phnum; ++i) {
1458 switch (phdr[i].p_type) {
1459 case PT_DYNAMIC:
1460 info->pt_dynamic_addr = phdr[i].p_vaddr + load_bias;
1461 break;
1462 case PT_LOAD:
1463 loadsegs->addr = phdr[i].p_vaddr + load_bias;
1464 loadsegs->p_vaddr = phdr[i].p_vaddr;
1465 loadsegs->p_memsz = phdr[i].p_memsz;
1466 ++loadsegs;
1467 break;
1468 }
1469 }
1470 }
1471 #endif
1472
1473 info->load_bias = load_bias;
1474 info->load_addr = load_addr;
1475 info->entry = ehdr->e_entry + load_bias;
1476 info->start_code = -1;
1477 info->end_code = 0;
1478 info->start_data = -1;
1479 info->end_data = 0;
1480 info->brk = 0;
1481
1482 for (i = 0; i < ehdr->e_phnum; i++) {
1483 struct elf_phdr *eppnt = phdr + i;
1484 if (eppnt->p_type == PT_LOAD) {
1485 abi_ulong vaddr, vaddr_po, vaddr_ps, vaddr_ef, vaddr_em;
1486 int elf_prot = 0;
1487
1488 if (eppnt->p_flags & PF_R) elf_prot = PROT_READ;
1489 if (eppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
1490 if (eppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
1491
1492 vaddr = load_bias + eppnt->p_vaddr;
1493 vaddr_po = TARGET_ELF_PAGEOFFSET(vaddr);
1494 vaddr_ps = TARGET_ELF_PAGESTART(vaddr);
1495
1496 error = target_mmap(vaddr_ps, eppnt->p_filesz + vaddr_po,
1497 elf_prot, MAP_PRIVATE | MAP_FIXED,
1498 image_fd, eppnt->p_offset - vaddr_po);
1499 if (error == -1) {
1500 goto exit_perror;
1501 }
1502
1503 vaddr_ef = vaddr + eppnt->p_filesz;
1504 vaddr_em = vaddr + eppnt->p_memsz;
1505
1506 /* If the load segment requests extra zeros (e.g. bss), map it. */
1507 if (vaddr_ef < vaddr_em) {
1508 zero_bss(vaddr_ef, vaddr_em, elf_prot);
1509 }
1510
1511 /* Find the full program boundaries. */
1512 if (elf_prot & PROT_EXEC) {
1513 if (vaddr < info->start_code) {
1514 info->start_code = vaddr;
1515 }
1516 if (vaddr_ef > info->end_code) {
1517 info->end_code = vaddr_ef;
1518 }
1519 }
1520 if (elf_prot & PROT_WRITE) {
1521 if (vaddr < info->start_data) {
1522 info->start_data = vaddr;
1523 }
1524 if (vaddr_ef > info->end_data) {
1525 info->end_data = vaddr_ef;
1526 }
1527 if (vaddr_em > info->brk) {
1528 info->brk = vaddr_em;
1529 }
1530 }
1531 } else if (eppnt->p_type == PT_INTERP && pinterp_name) {
1532 char *interp_name;
1533
1534 if (*pinterp_name) {
1535 errmsg = "Multiple PT_INTERP entries";
1536 goto exit_errmsg;
1537 }
1538 interp_name = malloc(eppnt->p_filesz);
1539 if (!interp_name) {
1540 goto exit_perror;
1541 }
1542
1543 if (eppnt->p_offset + eppnt->p_filesz <= BPRM_BUF_SIZE) {
1544 memcpy(interp_name, bprm_buf + eppnt->p_offset,
1545 eppnt->p_filesz);
1546 } else {
1547 retval = pread(image_fd, interp_name, eppnt->p_filesz,
1548 eppnt->p_offset);
1549 if (retval != eppnt->p_filesz) {
1550 goto exit_perror;
1551 }
1552 }
1553 if (interp_name[eppnt->p_filesz - 1] != 0) {
1554 errmsg = "Invalid PT_INTERP entry";
1555 goto exit_errmsg;
1556 }
1557 *pinterp_name = interp_name;
1558 }
1559 }
1560
1561 if (info->end_data == 0) {
1562 info->start_data = info->end_code;
1563 info->end_data = info->end_code;
1564 info->brk = info->end_code;
1565 }
1566
1567 if (qemu_log_enabled()) {
1568 load_symbols(ehdr, image_fd, load_bias);
1569 }
1570
1571 close(image_fd);
1572 return;
1573
1574 exit_read:
1575 if (retval >= 0) {
1576 errmsg = "Incomplete read of file header";
1577 goto exit_errmsg;
1578 }
1579 exit_perror:
1580 errmsg = strerror(errno);
1581 exit_errmsg:
1582 fprintf(stderr, "%s: %s\n", image_name, errmsg);
1583 exit(-1);
1584 }
1585
1586 static void load_elf_interp(const char *filename, struct image_info *info,
1587 char bprm_buf[BPRM_BUF_SIZE])
1588 {
1589 int fd, retval;
1590
1591 fd = open(path(filename), O_RDONLY);
1592 if (fd < 0) {
1593 goto exit_perror;
1594 }
1595
1596 retval = read(fd, bprm_buf, BPRM_BUF_SIZE);
1597 if (retval < 0) {
1598 goto exit_perror;
1599 }
1600 if (retval < BPRM_BUF_SIZE) {
1601 memset(bprm_buf + retval, 0, BPRM_BUF_SIZE - retval);
1602 }
1603
1604 load_elf_image(filename, fd, info, NULL, bprm_buf);
1605 return;
1606
1607 exit_perror:
1608 fprintf(stderr, "%s: %s\n", filename, strerror(errno));
1609 exit(-1);
1610 }
1611
1612 static int symfind(const void *s0, const void *s1)
1613 {
1614 struct elf_sym *key = (struct elf_sym *)s0;
1615 struct elf_sym *sym = (struct elf_sym *)s1;
1616 int result = 0;
1617 if (key->st_value < sym->st_value) {
1618 result = -1;
1619 } else if (key->st_value >= sym->st_value + sym->st_size) {
1620 result = 1;
1621 }
1622 return result;
1623 }
1624
1625 static const char *lookup_symbolxx(struct syminfo *s, target_ulong orig_addr)
1626 {
1627 #if ELF_CLASS == ELFCLASS32
1628 struct elf_sym *syms = s->disas_symtab.elf32;
1629 #else
1630 struct elf_sym *syms = s->disas_symtab.elf64;
1631 #endif
1632
1633 // binary search
1634 struct elf_sym key;
1635 struct elf_sym *sym;
1636
1637 key.st_value = orig_addr;
1638
1639 sym = bsearch(&key, syms, s->disas_num_syms, sizeof(*syms), symfind);
1640 if (sym != NULL) {
1641 return s->disas_strtab + sym->st_name;
1642 }
1643
1644 return "";
1645 }
1646
1647 /* FIXME: This should use elf_ops.h */
1648 static int symcmp(const void *s0, const void *s1)
1649 {
1650 struct elf_sym *sym0 = (struct elf_sym *)s0;
1651 struct elf_sym *sym1 = (struct elf_sym *)s1;
1652 return (sym0->st_value < sym1->st_value)
1653 ? -1
1654 : ((sym0->st_value > sym1->st_value) ? 1 : 0);
1655 }
1656
1657 /* Best attempt to load symbols from this ELF object. */
1658 static void load_symbols(struct elfhdr *hdr, int fd, abi_ulong load_bias)
1659 {
1660 int i, shnum, nsyms, sym_idx = 0, str_idx = 0;
1661 struct elf_shdr *shdr;
1662 char *strings = NULL;
1663 struct syminfo *s = NULL;
1664 struct elf_sym *new_syms, *syms = NULL;
1665
1666 shnum = hdr->e_shnum;
1667 i = shnum * sizeof(struct elf_shdr);
1668 shdr = (struct elf_shdr *)alloca(i);
1669 if (pread(fd, shdr, i, hdr->e_shoff) != i) {
1670 return;
1671 }
1672
1673 bswap_shdr(shdr, shnum);
1674 for (i = 0; i < shnum; ++i) {
1675 if (shdr[i].sh_type == SHT_SYMTAB) {
1676 sym_idx = i;
1677 str_idx = shdr[i].sh_link;
1678 goto found;
1679 }
1680 }
1681
1682 /* There will be no symbol table if the file was stripped. */
1683 return;
1684
1685 found:
1686 /* Now know where the strtab and symtab are. Snarf them. */
1687 s = malloc(sizeof(*s));
1688 if (!s) {
1689 goto give_up;
1690 }
1691
1692 i = shdr[str_idx].sh_size;
1693 s->disas_strtab = strings = malloc(i);
1694 if (!strings || pread(fd, strings, i, shdr[str_idx].sh_offset) != i) {
1695 goto give_up;
1696 }
1697
1698 i = shdr[sym_idx].sh_size;
1699 syms = malloc(i);
1700 if (!syms || pread(fd, syms, i, shdr[sym_idx].sh_offset) != i) {
1701 goto give_up;
1702 }
1703
1704 nsyms = i / sizeof(struct elf_sym);
1705 for (i = 0; i < nsyms; ) {
1706 bswap_sym(syms + i);
1707 /* Throw away entries which we do not need. */
1708 if (syms[i].st_shndx == SHN_UNDEF
1709 || syms[i].st_shndx >= SHN_LORESERVE
1710 || ELF_ST_TYPE(syms[i].st_info) != STT_FUNC) {
1711 if (i < --nsyms) {
1712 syms[i] = syms[nsyms];
1713 }
1714 } else {
1715 #if defined(TARGET_ARM) || defined (TARGET_MIPS)
1716 /* The bottom address bit marks a Thumb or MIPS16 symbol. */
1717 syms[i].st_value &= ~(target_ulong)1;
1718 #endif
1719 syms[i].st_value += load_bias;
1720 i++;
1721 }
1722 }
1723
1724 /* No "useful" symbol. */
1725 if (nsyms == 0) {
1726 goto give_up;
1727 }
1728
1729 /* Attempt to free the storage associated with the local symbols
1730 that we threw away. Whether or not this has any effect on the
1731 memory allocation depends on the malloc implementation and how
1732 many symbols we managed to discard. */
1733 new_syms = realloc(syms, nsyms * sizeof(*syms));
1734 if (new_syms == NULL) {
1735 goto give_up;
1736 }
1737 syms = new_syms;
1738
1739 qsort(syms, nsyms, sizeof(*syms), symcmp);
1740
1741 s->disas_num_syms = nsyms;
1742 #if ELF_CLASS == ELFCLASS32
1743 s->disas_symtab.elf32 = syms;
1744 #else
1745 s->disas_symtab.elf64 = syms;
1746 #endif
1747 s->lookup_symbol = lookup_symbolxx;
1748 s->next = syminfos;
1749 syminfos = s;
1750
1751 return;
1752
1753 give_up:
1754 free(s);
1755 free(strings);
1756 free(syms);
1757 }
1758
1759 int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
1760 struct image_info * info)
1761 {
1762 struct image_info interp_info;
1763 struct elfhdr elf_ex;
1764 char *elf_interpreter = NULL;
1765
1766 info->start_mmap = (abi_ulong)ELF_START_MMAP;
1767 info->mmap = 0;
1768 info->rss = 0;
1769
1770 load_elf_image(bprm->filename, bprm->fd, info,
1771 &elf_interpreter, bprm->buf);
1772
1773 /* ??? We need a copy of the elf header for passing to create_elf_tables.
1774 If we do nothing, we'll have overwritten this when we re-use bprm->buf
1775 when we load the interpreter. */
1776 elf_ex = *(struct elfhdr *)bprm->buf;
1777
1778 bprm->p = copy_elf_strings(1, &bprm->filename, bprm->page, bprm->p);
1779 bprm->p = copy_elf_strings(bprm->envc,bprm->envp,bprm->page,bprm->p);
1780 bprm->p = copy_elf_strings(bprm->argc,bprm->argv,bprm->page,bprm->p);
1781 if (!bprm->p) {
1782 fprintf(stderr, "%s: %s\n", bprm->filename, strerror(E2BIG));
1783 exit(-1);
1784 }
1785
1786 /* Do this so that we can load the interpreter, if need be. We will
1787 change some of these later */
1788 bprm->p = setup_arg_pages(bprm->p, bprm, info);
1789
1790 if (elf_interpreter) {
1791 load_elf_interp(elf_interpreter, &interp_info, bprm->buf);
1792
1793 /* If the program interpreter is one of these two, then assume
1794 an iBCS2 image. Otherwise assume a native linux image. */
1795
1796 if (strcmp(elf_interpreter, "/usr/lib/libc.so.1") == 0
1797 || strcmp(elf_interpreter, "/usr/lib/ld.so.1") == 0) {
1798 info->personality = PER_SVR4;
1799
1800 /* Why this, you ask??? Well SVr4 maps page 0 as read-only,
1801 and some applications "depend" upon this behavior. Since
1802 we do not have the power to recompile these, we emulate
1803 the SVr4 behavior. Sigh. */
1804 target_mmap(0, qemu_host_page_size, PROT_READ | PROT_EXEC,
1805 MAP_FIXED | MAP_PRIVATE, -1, 0);
1806 }
1807 }
1808
1809 bprm->p = create_elf_tables(bprm->p, bprm->argc, bprm->envc, &elf_ex,
1810 info, (elf_interpreter ? &interp_info : NULL));
1811 info->start_stack = bprm->p;
1812
1813 /* If we have an interpreter, set that as the program's entry point.
1814 Copy the load_addr as well, to help PPC64 interpret the entry
1815 point as a function descriptor. Do this after creating elf tables
1816 so that we copy the original program entry point into the AUXV. */
1817 if (elf_interpreter) {
1818 info->load_addr = interp_info.load_addr;
1819 info->entry = interp_info.entry;
1820 free(elf_interpreter);
1821 }
1822
1823 #ifdef USE_ELF_CORE_DUMP
1824 bprm->core_dump = &elf_core_dump;
1825 #endif
1826
1827 return 0;
1828 }
1829
1830 #ifdef USE_ELF_CORE_DUMP
1831 /*
1832 * Definitions to generate Intel SVR4-like core files.
1833 * These mostly have the same names as the SVR4 types with "target_elf_"
1834 * tacked on the front to prevent clashes with linux definitions,
1835 * and the typedef forms have been avoided. This is mostly like
1836 * the SVR4 structure, but more Linuxy, with things that Linux does
1837 * not support and which gdb doesn't really use excluded.
1838 *
1839 * Fields we don't dump (their contents is zero) in linux-user qemu
1840 * are marked with XXX.
1841 *
1842 * Core dump code is copied from linux kernel (fs/binfmt_elf.c).
1843 *
1844 * Porting ELF coredump for target is (quite) simple process. First you
1845 * define USE_ELF_CORE_DUMP in target ELF code (where init_thread() for
1846 * the target resides):
1847 *
1848 * #define USE_ELF_CORE_DUMP
1849 *
1850 * Next you define type of register set used for dumping. ELF specification
1851 * says that it needs to be array of elf_greg_t that has size of ELF_NREG.
1852 *
1853 * typedef <target_regtype> target_elf_greg_t;
1854 * #define ELF_NREG <number of registers>
1855 * typedef taret_elf_greg_t target_elf_gregset_t[ELF_NREG];
1856 *
1857 * Last step is to implement target specific function that copies registers
1858 * from given cpu into just specified register set. Prototype is:
1859 *
1860 * static void elf_core_copy_regs(taret_elf_gregset_t *regs,
1861 * const CPUState *env);
1862 *
1863 * Parameters:
1864 * regs - copy register values into here (allocated and zeroed by caller)
1865 * env - copy registers from here
1866 *
1867 * Example for ARM target is provided in this file.
1868 */
1869
1870 /* An ELF note in memory */
1871 struct memelfnote {
1872 const char *name;
1873 size_t namesz;
1874 size_t namesz_rounded;
1875 int type;
1876 size_t datasz;
1877 size_t datasz_rounded;
1878 void *data;
1879 size_t notesz;
1880 };
1881
1882 struct target_elf_siginfo {
1883 target_int si_signo; /* signal number */
1884 target_int si_code; /* extra code */
1885 target_int si_errno; /* errno */
1886 };
1887
1888 struct target_elf_prstatus {
1889 struct target_elf_siginfo pr_info; /* Info associated with signal */
1890 target_short pr_cursig; /* Current signal */
1891 target_ulong pr_sigpend; /* XXX */
1892 target_ulong pr_sighold; /* XXX */
1893 target_pid_t pr_pid;
1894 target_pid_t pr_ppid;
1895 target_pid_t pr_pgrp;
1896 target_pid_t pr_sid;
1897 struct target_timeval pr_utime; /* XXX User time */
1898 struct target_timeval pr_stime; /* XXX System time */
1899 struct target_timeval pr_cutime; /* XXX Cumulative user time */
1900 struct target_timeval pr_cstime; /* XXX Cumulative system time */
1901 target_elf_gregset_t pr_reg; /* GP registers */
1902 target_int pr_fpvalid; /* XXX */
1903 };
1904
1905 #define ELF_PRARGSZ (80) /* Number of chars for args */
1906
1907 struct target_elf_prpsinfo {
1908 char pr_state; /* numeric process state */
1909 char pr_sname; /* char for pr_state */
1910 char pr_zomb; /* zombie */
1911 char pr_nice; /* nice val */
1912 target_ulong pr_flag; /* flags */
1913 target_uid_t pr_uid;
1914 target_gid_t pr_gid;
1915 target_pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid;
1916 /* Lots missing */
1917 char pr_fname[16]; /* filename of executable */
1918 char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
1919 };
1920
1921 /* Here is the structure in which status of each thread is captured. */
1922 struct elf_thread_status {
1923 QTAILQ_ENTRY(elf_thread_status) ets_link;
1924 struct target_elf_prstatus prstatus; /* NT_PRSTATUS */
1925 #if 0
1926 elf_fpregset_t fpu; /* NT_PRFPREG */
1927 struct task_struct *thread;
1928 elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */
1929 #endif
1930 struct memelfnote notes[1];
1931 int num_notes;
1932 };
1933
1934 struct elf_note_info {
1935 struct memelfnote *notes;
1936 struct target_elf_prstatus *prstatus; /* NT_PRSTATUS */
1937 struct target_elf_prpsinfo *psinfo; /* NT_PRPSINFO */
1938
1939 QTAILQ_HEAD(thread_list_head, elf_thread_status) thread_list;
1940 #if 0
1941 /*
1942 * Current version of ELF coredump doesn't support
1943 * dumping fp regs etc.
1944 */
1945 elf_fpregset_t *fpu;
1946 elf_fpxregset_t *xfpu;
1947 int thread_status_size;
1948 #endif
1949 int notes_size;
1950 int numnote;
1951 };
1952
1953 struct vm_area_struct {
1954 abi_ulong vma_start; /* start vaddr of memory region */
1955 abi_ulong vma_end; /* end vaddr of memory region */
1956 abi_ulong vma_flags; /* protection etc. flags for the region */
1957 QTAILQ_ENTRY(vm_area_struct) vma_link;
1958 };
1959
1960 struct mm_struct {
1961 QTAILQ_HEAD(, vm_area_struct) mm_mmap;
1962 int mm_count; /* number of mappings */
1963 };
1964
1965 static struct mm_struct *vma_init(void);
1966 static void vma_delete(struct mm_struct *);
1967 static int vma_add_mapping(struct mm_struct *, abi_ulong,
1968 abi_ulong, abi_ulong);
1969 static int vma_get_mapping_count(const struct mm_struct *);
1970 static struct vm_area_struct *vma_first(const struct mm_struct *);
1971 static struct vm_area_struct *vma_next(struct vm_area_struct *);
1972 static abi_ulong vma_dump_size(const struct vm_area_struct *);
1973 static int vma_walker(void *priv, abi_ulong start, abi_ulong end,
1974 unsigned long flags);
1975
1976 static void fill_elf_header(struct elfhdr *, int, uint16_t, uint32_t);
1977 static void fill_note(struct memelfnote *, const char *, int,
1978 unsigned int, void *);
1979 static void fill_prstatus(struct target_elf_prstatus *, const TaskState *, int);
1980 static int fill_psinfo(struct target_elf_prpsinfo *, const TaskState *);
1981 static void fill_auxv_note(struct memelfnote *, const TaskState *);
1982 static void fill_elf_note_phdr(struct elf_phdr *, int, off_t);
1983 static size_t note_size(const struct memelfnote *);
1984 static void free_note_info(struct elf_note_info *);
1985 static int fill_note_info(struct elf_note_info *, long, const CPUState *);
1986 static void fill_thread_info(struct elf_note_info *, const CPUState *);
1987 static int core_dump_filename(const TaskState *, char *, size_t);
1988
1989 static int dump_write(int, const void *, size_t);
1990 static int write_note(struct memelfnote *, int);
1991 static int write_note_info(struct elf_note_info *, int);
1992
1993 #ifdef BSWAP_NEEDED
1994 static void bswap_prstatus(struct target_elf_prstatus *prstatus)
1995 {
1996 prstatus->pr_info.si_signo = tswapl(prstatus->pr_info.si_signo);
1997 prstatus->pr_info.si_code = tswapl(prstatus->pr_info.si_code);
1998 prstatus->pr_info.si_errno = tswapl(prstatus->pr_info.si_errno);
1999 prstatus->pr_cursig = tswap16(prstatus->pr_cursig);
2000 prstatus->pr_sigpend = tswapl(prstatus->pr_sigpend);
2001 prstatus->pr_sighold = tswapl(prstatus->pr_sighold);
2002 prstatus->pr_pid = tswap32(prstatus->pr_pid);
2003 prstatus->pr_ppid = tswap32(prstatus->pr_ppid);
2004 prstatus->pr_pgrp = tswap32(prstatus->pr_pgrp);
2005 prstatus->pr_sid = tswap32(prstatus->pr_sid);
2006 /* cpu times are not filled, so we skip them */
2007 /* regs should be in correct format already */
2008 prstatus->pr_fpvalid = tswap32(prstatus->pr_fpvalid);
2009 }
2010
2011 static void bswap_psinfo(struct target_elf_prpsinfo *psinfo)
2012 {
2013 psinfo->pr_flag = tswapl(psinfo->pr_flag);
2014 psinfo->pr_uid = tswap16(psinfo->pr_uid);
2015 psinfo->pr_gid = tswap16(psinfo->pr_gid);
2016 psinfo->pr_pid = tswap32(psinfo->pr_pid);
2017 psinfo->pr_ppid = tswap32(psinfo->pr_ppid);
2018 psinfo->pr_pgrp = tswap32(psinfo->pr_pgrp);
2019 psinfo->pr_sid = tswap32(psinfo->pr_sid);
2020 }
2021
2022 static void bswap_note(struct elf_note *en)
2023 {
2024 bswap32s(&en->n_namesz);
2025 bswap32s(&en->n_descsz);
2026 bswap32s(&en->n_type);
2027 }
2028 #else
2029 static inline void bswap_prstatus(struct target_elf_prstatus *p) { }
2030 static inline void bswap_psinfo(struct target_elf_prpsinfo *p) {}
2031 static inline void bswap_note(struct elf_note *en) { }
2032 #endif /* BSWAP_NEEDED */
2033
2034 /*
2035 * Minimal support for linux memory regions. These are needed
2036 * when we are finding out what memory exactly belongs to
2037 * emulated process. No locks needed here, as long as
2038 * thread that received the signal is stopped.
2039 */
2040
2041 static struct mm_struct *vma_init(void)
2042 {
2043 struct mm_struct *mm;
2044
2045 if ((mm = qemu_malloc(sizeof (*mm))) == NULL)
2046 return (NULL);
2047
2048 mm->mm_count = 0;
2049 QTAILQ_INIT(&mm->mm_mmap);
2050
2051 return (mm);
2052 }
2053
2054 static void vma_delete(struct mm_struct *mm)
2055 {
2056 struct vm_area_struct *vma;
2057
2058 while ((vma = vma_first(mm)) != NULL) {
2059 QTAILQ_REMOVE(&mm->mm_mmap, vma, vma_link);
2060 qemu_free(vma);
2061 }
2062 qemu_free(mm);
2063 }
2064
2065 static int vma_add_mapping(struct mm_struct *mm, abi_ulong start,
2066 abi_ulong end, abi_ulong flags)
2067 {
2068 struct vm_area_struct *vma;
2069
2070 if ((vma = qemu_mallocz(sizeof (*vma))) == NULL)
2071 return (-1);
2072
2073 vma->vma_start = start;
2074 vma->vma_end = end;
2075 vma->vma_flags = flags;
2076
2077 QTAILQ_INSERT_TAIL(&mm->mm_mmap, vma, vma_link);
2078 mm->mm_count++;
2079
2080 return (0);
2081 }
2082
2083 static struct vm_area_struct *vma_first(const struct mm_struct *mm)
2084 {
2085 return (QTAILQ_FIRST(&mm->mm_mmap));
2086 }
2087
2088 static struct vm_area_struct *vma_next(struct vm_area_struct *vma)
2089 {
2090 return (QTAILQ_NEXT(vma, vma_link));
2091 }
2092
2093 static int vma_get_mapping_count(const struct mm_struct *mm)
2094 {
2095 return (mm->mm_count);
2096 }
2097
2098 /*
2099 * Calculate file (dump) size of given memory region.
2100 */
2101 static abi_ulong vma_dump_size(const struct vm_area_struct *vma)
2102 {
2103 /* if we cannot even read the first page, skip it */
2104 if (!access_ok(VERIFY_READ, vma->vma_start, TARGET_PAGE_SIZE))
2105 return (0);
2106
2107 /*
2108 * Usually we don't dump executable pages as they contain
2109 * non-writable code that debugger can read directly from
2110 * target library etc. However, thread stacks are marked
2111 * also executable so we read in first page of given region
2112 * and check whether it contains elf header. If there is
2113 * no elf header, we dump it.
2114 */
2115 if (vma->vma_flags & PROT_EXEC) {
2116 char page[TARGET_PAGE_SIZE];
2117
2118 copy_from_user(page, vma->vma_start, sizeof (page));
2119 if ((page[EI_MAG0] == ELFMAG0) &&
2120 (page[EI_MAG1] == ELFMAG1) &&
2121 (page[EI_MAG2] == ELFMAG2) &&
2122 (page[EI_MAG3] == ELFMAG3)) {
2123 /*
2124 * Mappings are possibly from ELF binary. Don't dump
2125 * them.
2126 */
2127 return (0);
2128 }
2129 }
2130
2131 return (vma->vma_end - vma->vma_start);
2132 }
2133
2134 static int vma_walker(void *priv, abi_ulong start, abi_ulong end,
2135 unsigned long flags)
2136 {
2137 struct mm_struct *mm = (struct mm_struct *)priv;
2138
2139 vma_add_mapping(mm, start, end, flags);
2140 return (0);
2141 }
2142
2143 static void fill_note(struct memelfnote *note, const char *name, int type,
2144 unsigned int sz, void *data)
2145 {
2146 unsigned int namesz;
2147
2148 namesz = strlen(name) + 1;
2149 note->name = name;
2150 note->namesz = namesz;
2151 note->namesz_rounded = roundup(namesz, sizeof (int32_t));
2152 note->type = type;
2153 note->datasz = sz;
2154 note->datasz_rounded = roundup(sz, sizeof (int32_t));
2155
2156 note->data = data;
2157
2158 /*
2159 * We calculate rounded up note size here as specified by
2160 * ELF document.
2161 */
2162 note->notesz = sizeof (struct elf_note) +
2163 note->namesz_rounded + note->datasz_rounded;
2164 }
2165
2166 static void fill_elf_header(struct elfhdr *elf, int segs, uint16_t machine,
2167 uint32_t flags)
2168 {
2169 (void) memset(elf, 0, sizeof(*elf));
2170
2171 (void) memcpy(elf->e_ident, ELFMAG, SELFMAG);
2172 elf->e_ident[EI_CLASS] = ELF_CLASS;
2173 elf->e_ident[EI_DATA] = ELF_DATA;
2174 elf->e_ident[EI_VERSION] = EV_CURRENT;
2175 elf->e_ident[EI_OSABI] = ELF_OSABI;
2176
2177 elf->e_type = ET_CORE;
2178 elf->e_machine = machine;
2179 elf->e_version = EV_CURRENT;
2180 elf->e_phoff = sizeof(struct elfhdr);
2181 elf->e_flags = flags;
2182 elf->e_ehsize = sizeof(struct elfhdr);
2183 elf->e_phentsize = sizeof(struct elf_phdr);
2184 elf->e_phnum = segs;
2185
2186 bswap_ehdr(elf);
2187 }
2188
2189 static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, off_t offset)
2190 {
2191 phdr->p_type = PT_NOTE;
2192 phdr->p_offset = offset;
2193 phdr->p_vaddr = 0;
2194 phdr->p_paddr = 0;
2195 phdr->p_filesz = sz;
2196 phdr->p_memsz = 0;
2197 phdr->p_flags = 0;
2198 phdr->p_align = 0;
2199
2200 bswap_phdr(phdr, 1);
2201 }
2202
2203 static size_t note_size(const struct memelfnote *note)
2204 {
2205 return (note->notesz);
2206 }
2207
2208 static void fill_prstatus(struct target_elf_prstatus *prstatus,
2209 const TaskState *ts, int signr)
2210 {
2211 (void) memset(prstatus, 0, sizeof (*prstatus));
2212 prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
2213 prstatus->pr_pid = ts->ts_tid;
2214 prstatus->pr_ppid = getppid();
2215 prstatus->pr_pgrp = getpgrp();
2216 prstatus->pr_sid = getsid(0);
2217
2218 bswap_prstatus(prstatus);
2219 }
2220
2221 static int fill_psinfo(struct target_elf_prpsinfo *psinfo, const TaskState *ts)
2222 {
2223 char *filename, *base_filename;
2224 unsigned int i, len;
2225
2226 (void) memset(psinfo, 0, sizeof (*psinfo));
2227
2228 len = ts->info->arg_end - ts->info->arg_start;
2229 if (len >= ELF_PRARGSZ)
2230 len = ELF_PRARGSZ - 1;
2231 if (copy_from_user(&psinfo->pr_psargs, ts->info->arg_start, len))
2232 return -EFAULT;
2233 for (i = 0; i < len; i++)
2234 if (psinfo->pr_psargs[i] == 0)
2235 psinfo->pr_psargs[i] = ' ';
2236 psinfo->pr_psargs[len] = 0;
2237
2238 psinfo->pr_pid = getpid();
2239 psinfo->pr_ppid = getppid();
2240 psinfo->pr_pgrp = getpgrp();
2241 psinfo->pr_sid = getsid(0);
2242 psinfo->pr_uid = getuid();
2243 psinfo->pr_gid = getgid();
2244
2245 filename = strdup(ts->bprm->filename);
2246 base_filename = strdup(basename(filename));
2247 (void) strncpy(psinfo->pr_fname, base_filename,
2248 sizeof(psinfo->pr_fname));
2249 free(base_filename);
2250 free(filename);
2251
2252 bswap_psinfo(psinfo);
2253 return (0);
2254 }
2255
2256 static void fill_auxv_note(struct memelfnote *note, const TaskState *ts)
2257 {
2258 elf_addr_t auxv = (elf_addr_t)ts->info->saved_auxv;
2259 elf_addr_t orig_auxv = auxv;
2260 abi_ulong val;
2261 void *ptr;
2262 int i, len;
2263
2264 /*
2265 * Auxiliary vector is stored in target process stack. It contains
2266 * {type, value} pairs that we need to dump into note. This is not
2267 * strictly necessary but we do it here for sake of completeness.
2268 */
2269
2270 /* find out lenght of the vector, AT_NULL is terminator */
2271 i = len = 0;
2272 do {
2273 get_user_ual(val, auxv);
2274 i += 2;
2275 auxv += 2 * sizeof (elf_addr_t);
2276 } while (val != AT_NULL);
2277 len = i * sizeof (elf_addr_t);
2278
2279 /* read in whole auxv vector and copy it to memelfnote */
2280 ptr = lock_user(VERIFY_READ, orig_auxv, len, 0);
2281 if (ptr != NULL) {
2282 fill_note(note, "CORE", NT_AUXV, len, ptr);
2283 unlock_user(ptr, auxv, len);
2284 }
2285 }
2286
2287 /*
2288 * Constructs name of coredump file. We have following convention
2289 * for the name:
2290 * qemu_<basename-of-target-binary>_<date>-<time>_<pid>.core
2291 *
2292 * Returns 0 in case of success, -1 otherwise (errno is set).
2293 */
2294 static int core_dump_filename(const TaskState *ts, char *buf,
2295 size_t bufsize)
2296 {
2297 char timestamp[64];
2298 char *filename = NULL;
2299 char *base_filename = NULL;
2300 struct timeval tv;
2301 struct tm tm;
2302
2303 assert(bufsize >= PATH_MAX);
2304
2305 if (gettimeofday(&tv, NULL) < 0) {
2306 (void) fprintf(stderr, "unable to get current timestamp: %s",
2307 strerror(errno));
2308 return (-1);
2309 }
2310
2311 filename = strdup(ts->bprm->filename);
2312 base_filename = strdup(basename(filename));
2313 (void) strftime(timestamp, sizeof (timestamp), "%Y%m%d-%H%M%S",
2314 localtime_r(&tv.tv_sec, &tm));
2315 (void) snprintf(buf, bufsize, "qemu_%s_%s_%d.core",
2316 base_filename, timestamp, (int)getpid());
2317 free(base_filename);
2318 free(filename);
2319
2320 return (0);
2321 }
2322
2323 static int dump_write(int fd, const void *ptr, size_t size)
2324 {
2325 const char *bufp = (const char *)ptr;
2326 ssize_t bytes_written, bytes_left;
2327 struct rlimit dumpsize;
2328 off_t pos;
2329
2330 bytes_written = 0;
2331 getrlimit(RLIMIT_CORE, &dumpsize);
2332 if ((pos = lseek(fd, 0, SEEK_CUR))==-1) {
2333 if (errno == ESPIPE) { /* not a seekable stream */
2334 bytes_left = size;
2335 } else {
2336 return pos;
2337 }
2338 } else {
2339 if (dumpsize.rlim_cur <= pos) {
2340 return -1;
2341 } else if (dumpsize.rlim_cur == RLIM_INFINITY) {
2342 bytes_left = size;
2343 } else {
2344 size_t limit_left=dumpsize.rlim_cur - pos;
2345 bytes_left = limit_left >= size ? size : limit_left ;
2346 }
2347 }
2348
2349 /*
2350 * In normal conditions, single write(2) should do but
2351 * in case of socket etc. this mechanism is more portable.
2352 */
2353 do {
2354 bytes_written = write(fd, bufp, bytes_left);
2355 if (bytes_written < 0) {
2356 if (errno == EINTR)
2357 continue;
2358 return (-1);
2359 } else if (bytes_written == 0) { /* eof */
2360 return (-1);
2361 }
2362 bufp += bytes_written;
2363 bytes_left -= bytes_written;
2364 } while (bytes_left > 0);
2365
2366 return (0);
2367 }
2368
2369 static int write_note(struct memelfnote *men, int fd)
2370 {
2371 struct elf_note en;
2372
2373 en.n_namesz = men->namesz;
2374 en.n_type = men->type;
2375 en.n_descsz = men->datasz;
2376
2377 bswap_note(&en);
2378
2379 if (dump_write(fd, &en, sizeof(en)) != 0)
2380 return (-1);
2381 if (dump_write(fd, men->name, men->namesz_rounded) != 0)
2382 return (-1);
2383 if (dump_write(fd, men->data, men->datasz_rounded) != 0)
2384 return (-1);
2385
2386 return (0);
2387 }
2388
2389 static void fill_thread_info(struct elf_note_info *info, const CPUState *env)
2390 {
2391 TaskState *ts = (TaskState *)env->opaque;
2392 struct elf_thread_status *ets;
2393
2394 ets = qemu_mallocz(sizeof (*ets));
2395 ets->num_notes = 1; /* only prstatus is dumped */
2396 fill_prstatus(&ets->prstatus, ts, 0);
2397 elf_core_copy_regs(&ets->prstatus.pr_reg, env);
2398 fill_note(&ets->notes[0], "CORE", NT_PRSTATUS, sizeof (ets->prstatus),
2399 &ets->prstatus);
2400
2401 QTAILQ_INSERT_TAIL(&info->thread_list, ets, ets_link);
2402
2403 info->notes_size += note_size(&ets->notes[0]);
2404 }
2405
2406 static int fill_note_info(struct elf_note_info *info,
2407 long signr, const CPUState *env)
2408 {
2409 #define NUMNOTES 3
2410 CPUState *cpu = NULL;
2411 TaskState *ts = (TaskState *)env->opaque;
2412 int i;
2413
2414 (void) memset(info, 0, sizeof (*info));
2415
2416 QTAILQ_INIT(&info->thread_list);
2417
2418 info->notes = qemu_mallocz(NUMNOTES * sizeof (struct memelfnote));
2419 if (info->notes == NULL)
2420 return (-ENOMEM);
2421 info->prstatus = qemu_mallocz(sizeof (*info->prstatus));
2422 if (info->prstatus == NULL)
2423 return (-ENOMEM);
2424 info->psinfo = qemu_mallocz(sizeof (*info->psinfo));
2425 if (info->prstatus == NULL)
2426 return (-ENOMEM);
2427
2428 /*
2429 * First fill in status (and registers) of current thread
2430 * including process info & aux vector.
2431 */
2432 fill_prstatus(info->prstatus, ts, signr);
2433 elf_core_copy_regs(&info->prstatus->pr_reg, env);
2434 fill_note(&info->notes[0], "CORE", NT_PRSTATUS,
2435 sizeof (*info->prstatus), info->prstatus);
2436 fill_psinfo(info->psinfo, ts);
2437 fill_note(&info->notes[1], "CORE", NT_PRPSINFO,
2438 sizeof (*info->psinfo), info->psinfo);
2439 fill_auxv_note(&info->notes[2], ts);
2440 info->numnote = 3;
2441
2442 info->notes_size = 0;
2443 for (i = 0; i < info->numnote; i++)
2444 info->notes_size += note_size(&info->notes[i]);
2445
2446 /* read and fill status of all threads */
2447 cpu_list_lock();
2448 for (cpu = first_cpu; cpu != NULL; cpu = cpu->next_cpu) {
2449 if (cpu == thread_env)
2450 continue;
2451 fill_thread_info(info, cpu);
2452 }
2453 cpu_list_unlock();
2454
2455 return (0);
2456 }
2457
2458 static void free_note_info(struct elf_note_info *info)
2459 {
2460 struct elf_thread_status *ets;
2461
2462 while (!QTAILQ_EMPTY(&info->thread_list)) {
2463 ets = QTAILQ_FIRST(&info->thread_list);
2464 QTAILQ_REMOVE(&info->thread_list, ets, ets_link);
2465 qemu_free(ets);
2466 }
2467
2468 qemu_free(info->prstatus);
2469 qemu_free(info->psinfo);
2470 qemu_free(info->notes);
2471 }
2472
2473 static int write_note_info(struct elf_note_info *info, int fd)
2474 {
2475 struct elf_thread_status *ets;
2476 int i, error = 0;
2477
2478 /* write prstatus, psinfo and auxv for current thread */
2479 for (i = 0; i < info->numnote; i++)
2480 if ((error = write_note(&info->notes[i], fd)) != 0)
2481 return (error);
2482
2483 /* write prstatus for each thread */
2484 for (ets = info->thread_list.tqh_first; ets != NULL;
2485 ets = ets->ets_link.tqe_next) {
2486 if ((error = write_note(&ets->notes[0], fd)) != 0)
2487 return (error);
2488 }
2489
2490 return (0);
2491 }
2492
2493 /*
2494 * Write out ELF coredump.
2495 *
2496 * See documentation of ELF object file format in:
2497 * http://www.caldera.com/developers/devspecs/gabi41.pdf
2498 *
2499 * Coredump format in linux is following:
2500 *
2501 * 0 +----------------------+ \
2502 * | ELF header | ET_CORE |
2503 * +----------------------+ |
2504 * | ELF program headers | |--- headers
2505 * | - NOTE section | |
2506 * | - PT_LOAD sections | |
2507 * +----------------------+ /
2508 * | NOTEs: |
2509 * | - NT_PRSTATUS |
2510 * | - NT_PRSINFO |
2511 * | - NT_AUXV |
2512 * +----------------------+ <-- aligned to target page
2513 * | Process memory dump |
2514 * : :
2515 * . .
2516 * : :
2517 * | |
2518 * +----------------------+
2519 *
2520 * NT_PRSTATUS -> struct elf_prstatus (per thread)
2521 * NT_PRSINFO -> struct elf_prpsinfo
2522 * NT_AUXV is array of { type, value } pairs (see fill_auxv_note()).
2523 *
2524 * Format follows System V format as close as possible. Current
2525 * version limitations are as follows:
2526 * - no floating point registers are dumped
2527 *
2528 * Function returns 0 in case of success, negative errno otherwise.
2529 *
2530 * TODO: make this work also during runtime: it should be
2531 * possible to force coredump from running process and then
2532 * continue processing. For example qemu could set up SIGUSR2
2533 * handler (provided that target process haven't registered
2534 * handler for that) that does the dump when signal is received.
2535 */
2536 static int elf_core_dump(int signr, const CPUState *env)
2537 {
2538 const TaskState *ts = (const TaskState *)env->opaque;
2539 struct vm_area_struct *vma = NULL;
2540 char corefile[PATH_MAX];
2541 struct elf_note_info info;
2542 struct elfhdr elf;
2543 struct elf_phdr phdr;
2544 struct rlimit dumpsize;
2545 struct mm_struct *mm = NULL;
2546 off_t offset = 0, data_offset = 0;
2547 int segs = 0;
2548 int fd = -1;
2549
2550 errno = 0;
2551 getrlimit(RLIMIT_CORE, &dumpsize);
2552 if (dumpsize.rlim_cur == 0)
2553 return 0;
2554
2555 if (core_dump_filename(ts, corefile, sizeof (corefile)) < 0)
2556 return (-errno);
2557
2558 if ((fd = open(corefile, O_WRONLY | O_CREAT,
2559 S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)) < 0)
2560 return (-errno);
2561
2562 /*
2563 * Walk through target process memory mappings and
2564 * set up structure containing this information. After
2565 * this point vma_xxx functions can be used.
2566 */
2567 if ((mm = vma_init()) == NULL)
2568 goto out;
2569
2570 walk_memory_regions(mm, vma_walker);
2571 segs = vma_get_mapping_count(mm);
2572
2573 /*
2574 * Construct valid coredump ELF header. We also
2575 * add one more segment for notes.
2576 */
2577 fill_elf_header(&elf, segs + 1, ELF_MACHINE, 0);
2578 if (dump_write(fd, &elf, sizeof (elf)) != 0)
2579 goto out;
2580
2581 /* fill in in-memory version of notes */
2582 if (fill_note_info(&info, signr, env) < 0)
2583 goto out;
2584
2585 offset += sizeof (elf); /* elf header */
2586 offset += (segs + 1) * sizeof (struct elf_phdr); /* program headers */
2587
2588 /* write out notes program header */
2589 fill_elf_note_phdr(&phdr, info.notes_size, offset);
2590
2591 offset += info.notes_size;
2592 if (dump_write(fd, &phdr, sizeof (phdr)) != 0)
2593 goto out;
2594
2595 /*
2596 * ELF specification wants data to start at page boundary so
2597 * we align it here.
2598 */
2599 data_offset = offset = roundup(offset, ELF_EXEC_PAGESIZE);
2600
2601 /*
2602 * Write program headers for memory regions mapped in
2603 * the target process.
2604 */
2605 for (vma = vma_first(mm); vma != NULL; vma = vma_next(vma)) {
2606 (void) memset(&phdr, 0, sizeof (phdr));
2607
2608 phdr.p_type = PT_LOAD;
2609 phdr.p_offset = offset;
2610 phdr.p_vaddr = vma->vma_start;
2611 phdr.p_paddr = 0;
2612 phdr.p_filesz = vma_dump_size(vma);
2613 offset += phdr.p_filesz;
2614 phdr.p_memsz = vma->vma_end - vma->vma_start;
2615 phdr.p_flags = vma->vma_flags & PROT_READ ? PF_R : 0;
2616 if (vma->vma_flags & PROT_WRITE)
2617 phdr.p_flags |= PF_W;
2618 if (vma->vma_flags & PROT_EXEC)
2619 phdr.p_flags |= PF_X;
2620 phdr.p_align = ELF_EXEC_PAGESIZE;
2621
2622 bswap_phdr(&phdr, 1);
2623 dump_write(fd, &phdr, sizeof (phdr));
2624 }
2625
2626 /*
2627 * Next we write notes just after program headers. No
2628 * alignment needed here.
2629 */
2630 if (write_note_info(&info, fd) < 0)
2631 goto out;
2632
2633 /* align data to page boundary */
2634 if (lseek(fd, data_offset, SEEK_SET) != data_offset)
2635 goto out;
2636
2637 /*
2638 * Finally we can dump process memory into corefile as well.
2639 */
2640 for (vma = vma_first(mm); vma != NULL; vma = vma_next(vma)) {
2641 abi_ulong addr;
2642 abi_ulong end;
2643
2644 end = vma->vma_start + vma_dump_size(vma);
2645
2646 for (addr = vma->vma_start; addr < end;
2647 addr += TARGET_PAGE_SIZE) {
2648 char page[TARGET_PAGE_SIZE];
2649 int error;
2650
2651 /*
2652 * Read in page from target process memory and
2653 * write it to coredump file.
2654 */
2655 error = copy_from_user(page, addr, sizeof (page));
2656 if (error != 0) {
2657 (void) fprintf(stderr, "unable to dump " TARGET_ABI_FMT_lx "\n",
2658 addr);
2659 errno = -error;
2660 goto out;
2661 }
2662 if (dump_write(fd, page, TARGET_PAGE_SIZE) < 0)
2663 goto out;
2664 }
2665 }
2666
2667 out:
2668 free_note_info(&info);
2669 if (mm != NULL)
2670 vma_delete(mm);
2671 (void) close(fd);
2672
2673 if (errno != 0)
2674 return (-errno);
2675 return (0);
2676 }
2677 #endif /* USE_ELF_CORE_DUMP */
2678
2679 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop)
2680 {
2681 init_thread(regs, infop);
2682 }
QEmu