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rtl8139: drop tautologous if (ip) {...} statement (CVE-2015-5165)
[qemu/ar7.git] / linux-user / elfload.c
blob17883686f0704b85e5dbd7e80ca9f433f390f108
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/disas.h"
18
19 #ifdef _ARCH_PPC64
20 #undef ARCH_DLINFO
21 #undef ELF_PLATFORM
22 #undef ELF_HWCAP
23 #undef ELF_HWCAP2
24 #undef ELF_CLASS
25 #undef ELF_DATA
26 #undef ELF_ARCH
27 #endif
28
29 #define ELF_OSABI ELFOSABI_SYSV
30
31 /* from personality.h */
32
33 /*
34 * Flags for bug emulation.
35 *
36 * These occupy the top three bytes.
37 */
38 enum {
39 ADDR_NO_RANDOMIZE = 0x0040000, /* disable randomization of VA space */
40 FDPIC_FUNCPTRS = 0x0080000, /* userspace function ptrs point to
41 descriptors (signal handling) */
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 | WHOLE_SECONDS | SHORT_INODE,
65 PER_OSR5 = 0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS,
66 PER_WYSEV386 = 0x0004 | STICKY_TIMEOUTS | SHORT_INODE,
67 PER_ISCR4 = 0x0005 | STICKY_TIMEOUTS,
68 PER_BSD = 0x0006,
69 PER_SUNOS = 0x0006 | STICKY_TIMEOUTS,
70 PER_XENIX = 0x0007 | STICKY_TIMEOUTS | SHORT_INODE,
71 PER_LINUX32 = 0x0008,
72 PER_LINUX32_3GB = 0x0008 | ADDR_LIMIT_3GB,
73 PER_IRIX32 = 0x0009 | STICKY_TIMEOUTS,/* IRIX5 32-bit */
74 PER_IRIXN32 = 0x000a | STICKY_TIMEOUTS,/* IRIX6 new 32-bit */
75 PER_IRIX64 = 0x000b | STICKY_TIMEOUTS,/* IRIX6 64-bit */
76 PER_RISCOS = 0x000c,
77 PER_SOLARIS = 0x000d | STICKY_TIMEOUTS,
78 PER_UW7 = 0x000e | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
79 PER_OSF4 = 0x000f, /* OSF/1 v4 */
80 PER_HPUX = 0x0010,
81 PER_MASK = 0x00ff,
82 };
83
84 /*
85 * Return the base personality without flags.
86 */
87 #define personality(pers) (pers & PER_MASK)
88
89 /* this flag is uneffective under linux too, should be deleted */
90 #ifndef MAP_DENYWRITE
91 #define MAP_DENYWRITE 0
92 #endif
93
94 /* should probably go in elf.h */
95 #ifndef ELIBBAD
96 #define ELIBBAD 80
97 #endif
98
99 #ifdef TARGET_WORDS_BIGENDIAN
100 #define ELF_DATA ELFDATA2MSB
101 #else
102 #define ELF_DATA ELFDATA2LSB
103 #endif
104
105 #ifdef TARGET_ABI_MIPSN32
106 typedef abi_ullong target_elf_greg_t;
107 #define tswapreg(ptr) tswap64(ptr)
108 #else
109 typedef abi_ulong target_elf_greg_t;
110 #define tswapreg(ptr) tswapal(ptr)
111 #endif
112
113 #ifdef USE_UID16
114 typedef abi_ushort target_uid_t;
115 typedef abi_ushort target_gid_t;
116 #else
117 typedef abi_uint target_uid_t;
118 typedef abi_uint target_gid_t;
119 #endif
120 typedef abi_int target_pid_t;
121
122 #ifdef TARGET_I386
123
124 #define ELF_PLATFORM get_elf_platform()
125
126 static const char *get_elf_platform(void)
127 {
128 static char elf_platform[] = "i386";
129 int family = object_property_get_int(OBJECT(thread_cpu), "family", NULL);
130 if (family > 6)
131 family = 6;
132 if (family >= 3)
133 elf_platform[1] = '0' + family;
134 return elf_platform;
135 }
136
137 #define ELF_HWCAP get_elf_hwcap()
138
139 static uint32_t get_elf_hwcap(void)
140 {
141 X86CPU *cpu = X86_CPU(thread_cpu);
142
143 return cpu->env.features[FEAT_1_EDX];
144 }
145
146 #ifdef TARGET_X86_64
147 #define ELF_START_MMAP 0x2aaaaab000ULL
148 #define elf_check_arch(x) ( ((x) == ELF_ARCH) )
149
150 #define ELF_CLASS ELFCLASS64
151 #define ELF_ARCH EM_X86_64
152
153 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
154 {
155 regs->rax = 0;
156 regs->rsp = infop->start_stack;
157 regs->rip = infop->entry;
158 }
159
160 #define ELF_NREG 27
161 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
162
163 /*
164 * Note that ELF_NREG should be 29 as there should be place for
165 * TRAPNO and ERR "registers" as well but linux doesn't dump
166 * those.
167 *
168 * See linux kernel: arch/x86/include/asm/elf.h
169 */
170 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUX86State *env)
171 {
172 (*regs)[0] = env->regs[15];
173 (*regs)[1] = env->regs[14];
174 (*regs)[2] = env->regs[13];
175 (*regs)[3] = env->regs[12];
176 (*regs)[4] = env->regs[R_EBP];
177 (*regs)[5] = env->regs[R_EBX];
178 (*regs)[6] = env->regs[11];
179 (*regs)[7] = env->regs[10];
180 (*regs)[8] = env->regs[9];
181 (*regs)[9] = env->regs[8];
182 (*regs)[10] = env->regs[R_EAX];
183 (*regs)[11] = env->regs[R_ECX];
184 (*regs)[12] = env->regs[R_EDX];
185 (*regs)[13] = env->regs[R_ESI];
186 (*regs)[14] = env->regs[R_EDI];
187 (*regs)[15] = env->regs[R_EAX]; /* XXX */
188 (*regs)[16] = env->eip;
189 (*regs)[17] = env->segs[R_CS].selector & 0xffff;
190 (*regs)[18] = env->eflags;
191 (*regs)[19] = env->regs[R_ESP];
192 (*regs)[20] = env->segs[R_SS].selector & 0xffff;
193 (*regs)[21] = env->segs[R_FS].selector & 0xffff;
194 (*regs)[22] = env->segs[R_GS].selector & 0xffff;
195 (*regs)[23] = env->segs[R_DS].selector & 0xffff;
196 (*regs)[24] = env->segs[R_ES].selector & 0xffff;
197 (*regs)[25] = env->segs[R_FS].selector & 0xffff;
198 (*regs)[26] = env->segs[R_GS].selector & 0xffff;
199 }
200
201 #else
202
203 #define ELF_START_MMAP 0x80000000
204
205 /*
206 * This is used to ensure we don't load something for the wrong architecture.
207 */
208 #define elf_check_arch(x) ( ((x) == EM_386) || ((x) == EM_486) )
209
210 /*
211 * These are used to set parameters in the core dumps.
212 */
213 #define ELF_CLASS ELFCLASS32
214 #define ELF_ARCH EM_386
215
216 static inline void init_thread(struct target_pt_regs *regs,
217 struct image_info *infop)
218 {
219 regs->esp = infop->start_stack;
220 regs->eip = infop->entry;
221
222 /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program
223 starts %edx contains a pointer to a function which might be
224 registered using `atexit'. This provides a mean for the
225 dynamic linker to call DT_FINI functions for shared libraries
226 that have been loaded before the code runs.
227
228 A value of 0 tells we have no such handler. */
229 regs->edx = 0;
230 }
231
232 #define ELF_NREG 17
233 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
234
235 /*
236 * Note that ELF_NREG should be 19 as there should be place for
237 * TRAPNO and ERR "registers" as well but linux doesn't dump
238 * those.
239 *
240 * See linux kernel: arch/x86/include/asm/elf.h
241 */
242 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUX86State *env)
243 {
244 (*regs)[0] = env->regs[R_EBX];
245 (*regs)[1] = env->regs[R_ECX];
246 (*regs)[2] = env->regs[R_EDX];
247 (*regs)[3] = env->regs[R_ESI];
248 (*regs)[4] = env->regs[R_EDI];
249 (*regs)[5] = env->regs[R_EBP];
250 (*regs)[6] = env->regs[R_EAX];
251 (*regs)[7] = env->segs[R_DS].selector & 0xffff;
252 (*regs)[8] = env->segs[R_ES].selector & 0xffff;
253 (*regs)[9] = env->segs[R_FS].selector & 0xffff;
254 (*regs)[10] = env->segs[R_GS].selector & 0xffff;
255 (*regs)[11] = env->regs[R_EAX]; /* XXX */
256 (*regs)[12] = env->eip;
257 (*regs)[13] = env->segs[R_CS].selector & 0xffff;
258 (*regs)[14] = env->eflags;
259 (*regs)[15] = env->regs[R_ESP];
260 (*regs)[16] = env->segs[R_SS].selector & 0xffff;
261 }
262 #endif
263
264 #define USE_ELF_CORE_DUMP
265 #define ELF_EXEC_PAGESIZE 4096
266
267 #endif
268
269 #ifdef TARGET_ARM
270
271 #ifndef TARGET_AARCH64
272 /* 32 bit ARM definitions */
273
274 #define ELF_START_MMAP 0x80000000
275
276 #define elf_check_arch(x) ((x) == ELF_MACHINE)
277
278 #define ELF_ARCH ELF_MACHINE
279 #define ELF_CLASS ELFCLASS32
280
281 static inline void init_thread(struct target_pt_regs *regs,
282 struct image_info *infop)
283 {
284 abi_long stack = infop->start_stack;
285 memset(regs, 0, sizeof(*regs));
286
287 regs->ARM_cpsr = 0x10;
288 if (infop->entry & 1)
289 regs->ARM_cpsr |= CPSR_T;
290 regs->ARM_pc = infop->entry & 0xfffffffe;
291 regs->ARM_sp = infop->start_stack;
292 /* FIXME - what to for failure of get_user()? */
293 get_user_ual(regs->ARM_r2, stack + 8); /* envp */
294 get_user_ual(regs->ARM_r1, stack + 4); /* envp */
295 /* XXX: it seems that r0 is zeroed after ! */
296 regs->ARM_r0 = 0;
297 /* For uClinux PIC binaries. */
298 /* XXX: Linux does this only on ARM with no MMU (do we care ?) */
299 regs->ARM_r10 = infop->start_data;
300 }
301
302 #define ELF_NREG 18
303 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
304
305 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUARMState *env)
306 {
307 (*regs)[0] = tswapreg(env->regs[0]);
308 (*regs)[1] = tswapreg(env->regs[1]);
309 (*regs)[2] = tswapreg(env->regs[2]);
310 (*regs)[3] = tswapreg(env->regs[3]);
311 (*regs)[4] = tswapreg(env->regs[4]);
312 (*regs)[5] = tswapreg(env->regs[5]);
313 (*regs)[6] = tswapreg(env->regs[6]);
314 (*regs)[7] = tswapreg(env->regs[7]);
315 (*regs)[8] = tswapreg(env->regs[8]);
316 (*regs)[9] = tswapreg(env->regs[9]);
317 (*regs)[10] = tswapreg(env->regs[10]);
318 (*regs)[11] = tswapreg(env->regs[11]);
319 (*regs)[12] = tswapreg(env->regs[12]);
320 (*regs)[13] = tswapreg(env->regs[13]);
321 (*regs)[14] = tswapreg(env->regs[14]);
322 (*regs)[15] = tswapreg(env->regs[15]);
323
324 (*regs)[16] = tswapreg(cpsr_read((CPUARMState *)env));
325 (*regs)[17] = tswapreg(env->regs[0]); /* XXX */
326 }
327
328 #define USE_ELF_CORE_DUMP
329 #define ELF_EXEC_PAGESIZE 4096
330
331 enum
332 {
333 ARM_HWCAP_ARM_SWP = 1 << 0,
334 ARM_HWCAP_ARM_HALF = 1 << 1,
335 ARM_HWCAP_ARM_THUMB = 1 << 2,
336 ARM_HWCAP_ARM_26BIT = 1 << 3,
337 ARM_HWCAP_ARM_FAST_MULT = 1 << 4,
338 ARM_HWCAP_ARM_FPA = 1 << 5,
339 ARM_HWCAP_ARM_VFP = 1 << 6,
340 ARM_HWCAP_ARM_EDSP = 1 << 7,
341 ARM_HWCAP_ARM_JAVA = 1 << 8,
342 ARM_HWCAP_ARM_IWMMXT = 1 << 9,
343 ARM_HWCAP_ARM_CRUNCH = 1 << 10,
344 ARM_HWCAP_ARM_THUMBEE = 1 << 11,
345 ARM_HWCAP_ARM_NEON = 1 << 12,
346 ARM_HWCAP_ARM_VFPv3 = 1 << 13,
347 ARM_HWCAP_ARM_VFPv3D16 = 1 << 14,
348 ARM_HWCAP_ARM_TLS = 1 << 15,
349 ARM_HWCAP_ARM_VFPv4 = 1 << 16,
350 ARM_HWCAP_ARM_IDIVA = 1 << 17,
351 ARM_HWCAP_ARM_IDIVT = 1 << 18,
352 ARM_HWCAP_ARM_VFPD32 = 1 << 19,
353 ARM_HWCAP_ARM_LPAE = 1 << 20,
354 ARM_HWCAP_ARM_EVTSTRM = 1 << 21,
355 };
356
357 enum {
358 ARM_HWCAP2_ARM_AES = 1 << 0,
359 ARM_HWCAP2_ARM_PMULL = 1 << 1,
360 ARM_HWCAP2_ARM_SHA1 = 1 << 2,
361 ARM_HWCAP2_ARM_SHA2 = 1 << 3,
362 ARM_HWCAP2_ARM_CRC32 = 1 << 4,
363 };
364
365 /* The commpage only exists for 32 bit kernels */
366
367 #define TARGET_HAS_VALIDATE_GUEST_SPACE
368 /* Return 1 if the proposed guest space is suitable for the guest.
369 * Return 0 if the proposed guest space isn't suitable, but another
370 * address space should be tried.
371 * Return -1 if there is no way the proposed guest space can be
372 * valid regardless of the base.
373 * The guest code may leave a page mapped and populate it if the
374 * address is suitable.
375 */
376 static int validate_guest_space(unsigned long guest_base,
377 unsigned long guest_size)
378 {
379 unsigned long real_start, test_page_addr;
380
381 /* We need to check that we can force a fault on access to the
382 * commpage at 0xffff0fxx
383 */
384 test_page_addr = guest_base + (0xffff0f00 & qemu_host_page_mask);
385
386 /* If the commpage lies within the already allocated guest space,
387 * then there is no way we can allocate it.
388 */
389 if (test_page_addr >= guest_base
390 && test_page_addr <= (guest_base + guest_size)) {
391 return -1;
392 }
393
394 /* Note it needs to be writeable to let us initialise it */
395 real_start = (unsigned long)
396 mmap((void *)test_page_addr, qemu_host_page_size,
397 PROT_READ | PROT_WRITE,
398 MAP_ANONYMOUS | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
399
400 /* If we can't map it then try another address */
401 if (real_start == -1ul) {
402 return 0;
403 }
404
405 if (real_start != test_page_addr) {
406 /* OS didn't put the page where we asked - unmap and reject */
407 munmap((void *)real_start, qemu_host_page_size);
408 return 0;
409 }
410
411 /* Leave the page mapped
412 * Populate it (mmap should have left it all 0'd)
413 */
414
415 /* Kernel helper versions */
416 __put_user(5, (uint32_t *)g2h(0xffff0ffcul));
417
418 /* Now it's populated make it RO */
419 if (mprotect((void *)test_page_addr, qemu_host_page_size, PROT_READ)) {
420 perror("Protecting guest commpage");
421 exit(-1);
422 }
423
424 return 1; /* All good */
425 }
426
427 #define ELF_HWCAP get_elf_hwcap()
428 #define ELF_HWCAP2 get_elf_hwcap2()
429
430 static uint32_t get_elf_hwcap(void)
431 {
432 ARMCPU *cpu = ARM_CPU(thread_cpu);
433 uint32_t hwcaps = 0;
434
435 hwcaps |= ARM_HWCAP_ARM_SWP;
436 hwcaps |= ARM_HWCAP_ARM_HALF;
437 hwcaps |= ARM_HWCAP_ARM_THUMB;
438 hwcaps |= ARM_HWCAP_ARM_FAST_MULT;
439
440 /* probe for the extra features */
441 #define GET_FEATURE(feat, hwcap) \
442 do { if (arm_feature(&cpu->env, feat)) { hwcaps |= hwcap; } } while (0)
443 /* EDSP is in v5TE and above, but all our v5 CPUs are v5TE */
444 GET_FEATURE(ARM_FEATURE_V5, ARM_HWCAP_ARM_EDSP);
445 GET_FEATURE(ARM_FEATURE_VFP, ARM_HWCAP_ARM_VFP);
446 GET_FEATURE(ARM_FEATURE_IWMMXT, ARM_HWCAP_ARM_IWMMXT);
447 GET_FEATURE(ARM_FEATURE_THUMB2EE, ARM_HWCAP_ARM_THUMBEE);
448 GET_FEATURE(ARM_FEATURE_NEON, ARM_HWCAP_ARM_NEON);
449 GET_FEATURE(ARM_FEATURE_VFP3, ARM_HWCAP_ARM_VFPv3);
450 GET_FEATURE(ARM_FEATURE_V6K, ARM_HWCAP_ARM_TLS);
451 GET_FEATURE(ARM_FEATURE_VFP4, ARM_HWCAP_ARM_VFPv4);
452 GET_FEATURE(ARM_FEATURE_ARM_DIV, ARM_HWCAP_ARM_IDIVA);
453 GET_FEATURE(ARM_FEATURE_THUMB_DIV, ARM_HWCAP_ARM_IDIVT);
454 /* All QEMU's VFPv3 CPUs have 32 registers, see VFP_DREG in translate.c.
455 * Note that the ARM_HWCAP_ARM_VFPv3D16 bit is always the inverse of
456 * ARM_HWCAP_ARM_VFPD32 (and so always clear for QEMU); it is unrelated
457 * to our VFP_FP16 feature bit.
458 */
459 GET_FEATURE(ARM_FEATURE_VFP3, ARM_HWCAP_ARM_VFPD32);
460 GET_FEATURE(ARM_FEATURE_LPAE, ARM_HWCAP_ARM_LPAE);
461
462 return hwcaps;
463 }
464
465 static uint32_t get_elf_hwcap2(void)
466 {
467 ARMCPU *cpu = ARM_CPU(thread_cpu);
468 uint32_t hwcaps = 0;
469
470 GET_FEATURE(ARM_FEATURE_V8_AES, ARM_HWCAP2_ARM_AES);
471 GET_FEATURE(ARM_FEATURE_V8_PMULL, ARM_HWCAP2_ARM_PMULL);
472 GET_FEATURE(ARM_FEATURE_V8_SHA1, ARM_HWCAP2_ARM_SHA1);
473 GET_FEATURE(ARM_FEATURE_V8_SHA256, ARM_HWCAP2_ARM_SHA2);
474 GET_FEATURE(ARM_FEATURE_CRC, ARM_HWCAP2_ARM_CRC32);
475 return hwcaps;
476 }
477
478 #undef GET_FEATURE
479
480 #else
481 /* 64 bit ARM definitions */
482 #define ELF_START_MMAP 0x80000000
483
484 #define elf_check_arch(x) ((x) == ELF_MACHINE)
485
486 #define ELF_ARCH ELF_MACHINE
487 #define ELF_CLASS ELFCLASS64
488 #define ELF_PLATFORM "aarch64"
489
490 static inline void init_thread(struct target_pt_regs *regs,
491 struct image_info *infop)
492 {
493 abi_long stack = infop->start_stack;
494 memset(regs, 0, sizeof(*regs));
495
496 regs->pc = infop->entry & ~0x3ULL;
497 regs->sp = stack;
498 }
499
500 #define ELF_NREG 34
501 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
502
503 static void elf_core_copy_regs(target_elf_gregset_t *regs,
504 const CPUARMState *env)
505 {
506 int i;
507
508 for (i = 0; i < 32; i++) {
509 (*regs)[i] = tswapreg(env->xregs[i]);
510 }
511 (*regs)[32] = tswapreg(env->pc);
512 (*regs)[33] = tswapreg(pstate_read((CPUARMState *)env));
513 }
514
515 #define USE_ELF_CORE_DUMP
516 #define ELF_EXEC_PAGESIZE 4096
517
518 enum {
519 ARM_HWCAP_A64_FP = 1 << 0,
520 ARM_HWCAP_A64_ASIMD = 1 << 1,
521 ARM_HWCAP_A64_EVTSTRM = 1 << 2,
522 ARM_HWCAP_A64_AES = 1 << 3,
523 ARM_HWCAP_A64_PMULL = 1 << 4,
524 ARM_HWCAP_A64_SHA1 = 1 << 5,
525 ARM_HWCAP_A64_SHA2 = 1 << 6,
526 ARM_HWCAP_A64_CRC32 = 1 << 7,
527 };
528
529 #define ELF_HWCAP get_elf_hwcap()
530
531 static uint32_t get_elf_hwcap(void)
532 {
533 ARMCPU *cpu = ARM_CPU(thread_cpu);
534 uint32_t hwcaps = 0;
535
536 hwcaps |= ARM_HWCAP_A64_FP;
537 hwcaps |= ARM_HWCAP_A64_ASIMD;
538
539 /* probe for the extra features */
540 #define GET_FEATURE(feat, hwcap) \
541 do { if (arm_feature(&cpu->env, feat)) { hwcaps |= hwcap; } } while (0)
542 GET_FEATURE(ARM_FEATURE_V8_AES, ARM_HWCAP_A64_AES);
543 GET_FEATURE(ARM_FEATURE_V8_PMULL, ARM_HWCAP_A64_PMULL);
544 GET_FEATURE(ARM_FEATURE_V8_SHA1, ARM_HWCAP_A64_SHA1);
545 GET_FEATURE(ARM_FEATURE_V8_SHA256, ARM_HWCAP_A64_SHA2);
546 GET_FEATURE(ARM_FEATURE_CRC, ARM_HWCAP_A64_CRC32);
547 #undef GET_FEATURE
548
549 return hwcaps;
550 }
551
552 #endif /* not TARGET_AARCH64 */
553 #endif /* TARGET_ARM */
554
555 #ifdef TARGET_UNICORE32
556
557 #define ELF_START_MMAP 0x80000000
558
559 #define elf_check_arch(x) ((x) == EM_UNICORE32)
560
561 #define ELF_CLASS ELFCLASS32
562 #define ELF_DATA ELFDATA2LSB
563 #define ELF_ARCH EM_UNICORE32
564
565 static inline void init_thread(struct target_pt_regs *regs,
566 struct image_info *infop)
567 {
568 abi_long stack = infop->start_stack;
569 memset(regs, 0, sizeof(*regs));
570 regs->UC32_REG_asr = 0x10;
571 regs->UC32_REG_pc = infop->entry & 0xfffffffe;
572 regs->UC32_REG_sp = infop->start_stack;
573 /* FIXME - what to for failure of get_user()? */
574 get_user_ual(regs->UC32_REG_02, stack + 8); /* envp */
575 get_user_ual(regs->UC32_REG_01, stack + 4); /* envp */
576 /* XXX: it seems that r0 is zeroed after ! */
577 regs->UC32_REG_00 = 0;
578 }
579
580 #define ELF_NREG 34
581 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
582
583 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUUniCore32State *env)
584 {
585 (*regs)[0] = env->regs[0];
586 (*regs)[1] = env->regs[1];
587 (*regs)[2] = env->regs[2];
588 (*regs)[3] = env->regs[3];
589 (*regs)[4] = env->regs[4];
590 (*regs)[5] = env->regs[5];
591 (*regs)[6] = env->regs[6];
592 (*regs)[7] = env->regs[7];
593 (*regs)[8] = env->regs[8];
594 (*regs)[9] = env->regs[9];
595 (*regs)[10] = env->regs[10];
596 (*regs)[11] = env->regs[11];
597 (*regs)[12] = env->regs[12];
598 (*regs)[13] = env->regs[13];
599 (*regs)[14] = env->regs[14];
600 (*regs)[15] = env->regs[15];
601 (*regs)[16] = env->regs[16];
602 (*regs)[17] = env->regs[17];
603 (*regs)[18] = env->regs[18];
604 (*regs)[19] = env->regs[19];
605 (*regs)[20] = env->regs[20];
606 (*regs)[21] = env->regs[21];
607 (*regs)[22] = env->regs[22];
608 (*regs)[23] = env->regs[23];
609 (*regs)[24] = env->regs[24];
610 (*regs)[25] = env->regs[25];
611 (*regs)[26] = env->regs[26];
612 (*regs)[27] = env->regs[27];
613 (*regs)[28] = env->regs[28];
614 (*regs)[29] = env->regs[29];
615 (*regs)[30] = env->regs[30];
616 (*regs)[31] = env->regs[31];
617
618 (*regs)[32] = cpu_asr_read((CPUUniCore32State *)env);
619 (*regs)[33] = env->regs[0]; /* XXX */
620 }
621
622 #define USE_ELF_CORE_DUMP
623 #define ELF_EXEC_PAGESIZE 4096
624
625 #define ELF_HWCAP (UC32_HWCAP_CMOV | UC32_HWCAP_UCF64)
626
627 #endif
628
629 #ifdef TARGET_SPARC
630 #ifdef TARGET_SPARC64
631
632 #define ELF_START_MMAP 0x80000000
633 #define ELF_HWCAP (HWCAP_SPARC_FLUSH | HWCAP_SPARC_STBAR | HWCAP_SPARC_SWAP \
634 | HWCAP_SPARC_MULDIV | HWCAP_SPARC_V9)
635 #ifndef TARGET_ABI32
636 #define elf_check_arch(x) ( (x) == EM_SPARCV9 || (x) == EM_SPARC32PLUS )
637 #else
638 #define elf_check_arch(x) ( (x) == EM_SPARC32PLUS || (x) == EM_SPARC )
639 #endif
640
641 #define ELF_CLASS ELFCLASS64
642 #define ELF_ARCH EM_SPARCV9
643
644 #define STACK_BIAS 2047
645
646 static inline void init_thread(struct target_pt_regs *regs,
647 struct image_info *infop)
648 {
649 #ifndef TARGET_ABI32
650 regs->tstate = 0;
651 #endif
652 regs->pc = infop->entry;
653 regs->npc = regs->pc + 4;
654 regs->y = 0;
655 #ifdef TARGET_ABI32
656 regs->u_regs[14] = infop->start_stack - 16 * 4;
657 #else
658 if (personality(infop->personality) == PER_LINUX32)
659 regs->u_regs[14] = infop->start_stack - 16 * 4;
660 else
661 regs->u_regs[14] = infop->start_stack - 16 * 8 - STACK_BIAS;
662 #endif
663 }
664
665 #else
666 #define ELF_START_MMAP 0x80000000
667 #define ELF_HWCAP (HWCAP_SPARC_FLUSH | HWCAP_SPARC_STBAR | HWCAP_SPARC_SWAP \
668 | HWCAP_SPARC_MULDIV)
669 #define elf_check_arch(x) ( (x) == EM_SPARC )
670
671 #define ELF_CLASS ELFCLASS32
672 #define ELF_ARCH EM_SPARC
673
674 static inline void init_thread(struct target_pt_regs *regs,
675 struct image_info *infop)
676 {
677 regs->psr = 0;
678 regs->pc = infop->entry;
679 regs->npc = regs->pc + 4;
680 regs->y = 0;
681 regs->u_regs[14] = infop->start_stack - 16 * 4;
682 }
683
684 #endif
685 #endif
686
687 #ifdef TARGET_PPC
688
689 #define ELF_START_MMAP 0x80000000
690
691 #if defined(TARGET_PPC64) && !defined(TARGET_ABI32)
692
693 #define elf_check_arch(x) ( (x) == EM_PPC64 )
694
695 #define ELF_CLASS ELFCLASS64
696
697 #else
698
699 #define elf_check_arch(x) ( (x) == EM_PPC )
700
701 #define ELF_CLASS ELFCLASS32
702
703 #endif
704
705 #define ELF_ARCH EM_PPC
706
707 /* Feature masks for the Aux Vector Hardware Capabilities (AT_HWCAP).
708 See arch/powerpc/include/asm/cputable.h. */
709 enum {
710 QEMU_PPC_FEATURE_32 = 0x80000000,
711 QEMU_PPC_FEATURE_64 = 0x40000000,
712 QEMU_PPC_FEATURE_601_INSTR = 0x20000000,
713 QEMU_PPC_FEATURE_HAS_ALTIVEC = 0x10000000,
714 QEMU_PPC_FEATURE_HAS_FPU = 0x08000000,
715 QEMU_PPC_FEATURE_HAS_MMU = 0x04000000,
716 QEMU_PPC_FEATURE_HAS_4xxMAC = 0x02000000,
717 QEMU_PPC_FEATURE_UNIFIED_CACHE = 0x01000000,
718 QEMU_PPC_FEATURE_HAS_SPE = 0x00800000,
719 QEMU_PPC_FEATURE_HAS_EFP_SINGLE = 0x00400000,
720 QEMU_PPC_FEATURE_HAS_EFP_DOUBLE = 0x00200000,
721 QEMU_PPC_FEATURE_NO_TB = 0x00100000,
722 QEMU_PPC_FEATURE_POWER4 = 0x00080000,
723 QEMU_PPC_FEATURE_POWER5 = 0x00040000,
724 QEMU_PPC_FEATURE_POWER5_PLUS = 0x00020000,
725 QEMU_PPC_FEATURE_CELL = 0x00010000,
726 QEMU_PPC_FEATURE_BOOKE = 0x00008000,
727 QEMU_PPC_FEATURE_SMT = 0x00004000,
728 QEMU_PPC_FEATURE_ICACHE_SNOOP = 0x00002000,
729 QEMU_PPC_FEATURE_ARCH_2_05 = 0x00001000,
730 QEMU_PPC_FEATURE_PA6T = 0x00000800,
731 QEMU_PPC_FEATURE_HAS_DFP = 0x00000400,
732 QEMU_PPC_FEATURE_POWER6_EXT = 0x00000200,
733 QEMU_PPC_FEATURE_ARCH_2_06 = 0x00000100,
734 QEMU_PPC_FEATURE_HAS_VSX = 0x00000080,
735 QEMU_PPC_FEATURE_PSERIES_PERFMON_COMPAT = 0x00000040,
736
737 QEMU_PPC_FEATURE_TRUE_LE = 0x00000002,
738 QEMU_PPC_FEATURE_PPC_LE = 0x00000001,
739
740 /* Feature definitions in AT_HWCAP2. */
741 QEMU_PPC_FEATURE2_ARCH_2_07 = 0x80000000, /* ISA 2.07 */
742 QEMU_PPC_FEATURE2_HAS_HTM = 0x40000000, /* Hardware Transactional Memory */
743 QEMU_PPC_FEATURE2_HAS_DSCR = 0x20000000, /* Data Stream Control Register */
744 QEMU_PPC_FEATURE2_HAS_EBB = 0x10000000, /* Event Base Branching */
745 QEMU_PPC_FEATURE2_HAS_ISEL = 0x08000000, /* Integer Select */
746 QEMU_PPC_FEATURE2_HAS_TAR = 0x04000000, /* Target Address Register */
747 };
748
749 #define ELF_HWCAP get_elf_hwcap()
750
751 static uint32_t get_elf_hwcap(void)
752 {
753 PowerPCCPU *cpu = POWERPC_CPU(thread_cpu);
754 uint32_t features = 0;
755
756 /* We don't have to be terribly complete here; the high points are
757 Altivec/FP/SPE support. Anything else is just a bonus. */
758 #define GET_FEATURE(flag, feature) \
759 do { if (cpu->env.insns_flags & flag) { features |= feature; } } while (0)
760 #define GET_FEATURE2(flag, feature) \
761 do { if (cpu->env.insns_flags2 & flag) { features |= feature; } } while (0)
762 GET_FEATURE(PPC_64B, QEMU_PPC_FEATURE_64);
763 GET_FEATURE(PPC_FLOAT, QEMU_PPC_FEATURE_HAS_FPU);
764 GET_FEATURE(PPC_ALTIVEC, QEMU_PPC_FEATURE_HAS_ALTIVEC);
765 GET_FEATURE(PPC_SPE, QEMU_PPC_FEATURE_HAS_SPE);
766 GET_FEATURE(PPC_SPE_SINGLE, QEMU_PPC_FEATURE_HAS_EFP_SINGLE);
767 GET_FEATURE(PPC_SPE_DOUBLE, QEMU_PPC_FEATURE_HAS_EFP_DOUBLE);
768 GET_FEATURE(PPC_BOOKE, QEMU_PPC_FEATURE_BOOKE);
769 GET_FEATURE(PPC_405_MAC, QEMU_PPC_FEATURE_HAS_4xxMAC);
770 GET_FEATURE2(PPC2_DFP, QEMU_PPC_FEATURE_HAS_DFP);
771 GET_FEATURE2(PPC2_VSX, QEMU_PPC_FEATURE_HAS_VSX);
772 GET_FEATURE2((PPC2_PERM_ISA206 | PPC2_DIVE_ISA206 | PPC2_ATOMIC_ISA206 |
773 PPC2_FP_CVT_ISA206 | PPC2_FP_TST_ISA206),
774 QEMU_PPC_FEATURE_ARCH_2_06);
775 #undef GET_FEATURE
776 #undef GET_FEATURE2
777
778 return features;
779 }
780
781 #define ELF_HWCAP2 get_elf_hwcap2()
782
783 static uint32_t get_elf_hwcap2(void)
784 {
785 PowerPCCPU *cpu = POWERPC_CPU(thread_cpu);
786 uint32_t features = 0;
787
788 #define GET_FEATURE(flag, feature) \
789 do { if (cpu->env.insns_flags & flag) { features |= feature; } } while (0)
790 #define GET_FEATURE2(flag, feature) \
791 do { if (cpu->env.insns_flags2 & flag) { features |= feature; } } while (0)
792
793 GET_FEATURE(PPC_ISEL, QEMU_PPC_FEATURE2_HAS_ISEL);
794 GET_FEATURE2(PPC2_BCTAR_ISA207, QEMU_PPC_FEATURE2_HAS_TAR);
795 GET_FEATURE2((PPC2_BCTAR_ISA207 | PPC2_LSQ_ISA207 | PPC2_ALTIVEC_207 |
796 PPC2_ISA207S), QEMU_PPC_FEATURE2_ARCH_2_07);
797
798 #undef GET_FEATURE
799 #undef GET_FEATURE2
800
801 return features;
802 }
803
804 /*
805 * The requirements here are:
806 * - keep the final alignment of sp (sp & 0xf)
807 * - make sure the 32-bit value at the first 16 byte aligned position of
808 * AUXV is greater than 16 for glibc compatibility.
809 * AT_IGNOREPPC is used for that.
810 * - for compatibility with glibc ARCH_DLINFO must always be defined on PPC,
811 * even if DLINFO_ARCH_ITEMS goes to zero or is undefined.
812 */
813 #define DLINFO_ARCH_ITEMS 5
814 #define ARCH_DLINFO \
815 do { \
816 PowerPCCPU *cpu = POWERPC_CPU(thread_cpu); \
817 NEW_AUX_ENT(AT_DCACHEBSIZE, cpu->env.dcache_line_size); \
818 NEW_AUX_ENT(AT_ICACHEBSIZE, cpu->env.icache_line_size); \
819 NEW_AUX_ENT(AT_UCACHEBSIZE, 0); \
820 /* \
821 * Now handle glibc compatibility. \
822 */ \
823 NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \
824 NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \
825 } while (0)
826
827 static inline void init_thread(struct target_pt_regs *_regs, struct image_info *infop)
828 {
829 _regs->gpr[1] = infop->start_stack;
830 #if defined(TARGET_PPC64) && !defined(TARGET_ABI32)
831 if (get_ppc64_abi(infop) < 2) {
832 uint64_t val;
833 get_user_u64(val, infop->entry + 8);
834 _regs->gpr[2] = val + infop->load_bias;
835 get_user_u64(val, infop->entry);
836 infop->entry = val + infop->load_bias;
837 } else {
838 _regs->gpr[12] = infop->entry; /* r12 set to global entry address */
839 }
840 #endif
841 _regs->nip = infop->entry;
842 }
843
844 /* See linux kernel: arch/powerpc/include/asm/elf.h. */
845 #define ELF_NREG 48
846 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
847
848 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUPPCState *env)
849 {
850 int i;
851 target_ulong ccr = 0;
852
853 for (i = 0; i < ARRAY_SIZE(env->gpr); i++) {
854 (*regs)[i] = tswapreg(env->gpr[i]);
855 }
856
857 (*regs)[32] = tswapreg(env->nip);
858 (*regs)[33] = tswapreg(env->msr);
859 (*regs)[35] = tswapreg(env->ctr);
860 (*regs)[36] = tswapreg(env->lr);
861 (*regs)[37] = tswapreg(env->xer);
862
863 for (i = 0; i < ARRAY_SIZE(env->crf); i++) {
864 ccr |= env->crf[i] << (32 - ((i + 1) * 4));
865 }
866 (*regs)[38] = tswapreg(ccr);
867 }
868
869 #define USE_ELF_CORE_DUMP
870 #define ELF_EXEC_PAGESIZE 4096
871
872 #endif
873
874 #ifdef TARGET_MIPS
875
876 #define ELF_START_MMAP 0x80000000
877
878 #define elf_check_arch(x) ( (x) == EM_MIPS )
879
880 #ifdef TARGET_MIPS64
881 #define ELF_CLASS ELFCLASS64
882 #else
883 #define ELF_CLASS ELFCLASS32
884 #endif
885 #define ELF_ARCH EM_MIPS
886
887 static inline void init_thread(struct target_pt_regs *regs,
888 struct image_info *infop)
889 {
890 regs->cp0_status = 2 << CP0St_KSU;
891 regs->cp0_epc = infop->entry;
892 regs->regs[29] = infop->start_stack;
893 }
894
895 /* See linux kernel: arch/mips/include/asm/elf.h. */
896 #define ELF_NREG 45
897 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
898
899 /* See linux kernel: arch/mips/include/asm/reg.h. */
900 enum {
901 #ifdef TARGET_MIPS64
902 TARGET_EF_R0 = 0,
903 #else
904 TARGET_EF_R0 = 6,
905 #endif
906 TARGET_EF_R26 = TARGET_EF_R0 + 26,
907 TARGET_EF_R27 = TARGET_EF_R0 + 27,
908 TARGET_EF_LO = TARGET_EF_R0 + 32,
909 TARGET_EF_HI = TARGET_EF_R0 + 33,
910 TARGET_EF_CP0_EPC = TARGET_EF_R0 + 34,
911 TARGET_EF_CP0_BADVADDR = TARGET_EF_R0 + 35,
912 TARGET_EF_CP0_STATUS = TARGET_EF_R0 + 36,
913 TARGET_EF_CP0_CAUSE = TARGET_EF_R0 + 37
914 };
915
916 /* See linux kernel: arch/mips/kernel/process.c:elf_dump_regs. */
917 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUMIPSState *env)
918 {
919 int i;
920
921 for (i = 0; i < TARGET_EF_R0; i++) {
922 (*regs)[i] = 0;
923 }
924 (*regs)[TARGET_EF_R0] = 0;
925
926 for (i = 1; i < ARRAY_SIZE(env->active_tc.gpr); i++) {
927 (*regs)[TARGET_EF_R0 + i] = tswapreg(env->active_tc.gpr[i]);
928 }
929
930 (*regs)[TARGET_EF_R26] = 0;
931 (*regs)[TARGET_EF_R27] = 0;
932 (*regs)[TARGET_EF_LO] = tswapreg(env->active_tc.LO[0]);
933 (*regs)[TARGET_EF_HI] = tswapreg(env->active_tc.HI[0]);
934 (*regs)[TARGET_EF_CP0_EPC] = tswapreg(env->active_tc.PC);
935 (*regs)[TARGET_EF_CP0_BADVADDR] = tswapreg(env->CP0_BadVAddr);
936 (*regs)[TARGET_EF_CP0_STATUS] = tswapreg(env->CP0_Status);
937 (*regs)[TARGET_EF_CP0_CAUSE] = tswapreg(env->CP0_Cause);
938 }
939
940 #define USE_ELF_CORE_DUMP
941 #define ELF_EXEC_PAGESIZE 4096
942
943 #endif /* TARGET_MIPS */
944
945 #ifdef TARGET_MICROBLAZE
946
947 #define ELF_START_MMAP 0x80000000
948
949 #define elf_check_arch(x) ( (x) == EM_MICROBLAZE || (x) == EM_MICROBLAZE_OLD)
950
951 #define ELF_CLASS ELFCLASS32
952 #define ELF_ARCH EM_MICROBLAZE
953
954 static inline void init_thread(struct target_pt_regs *regs,
955 struct image_info *infop)
956 {
957 regs->pc = infop->entry;
958 regs->r1 = infop->start_stack;
959
960 }
961
962 #define ELF_EXEC_PAGESIZE 4096
963
964 #define USE_ELF_CORE_DUMP
965 #define ELF_NREG 38
966 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
967
968 /* See linux kernel: arch/mips/kernel/process.c:elf_dump_regs. */
969 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUMBState *env)
970 {
971 int i, pos = 0;
972
973 for (i = 0; i < 32; i++) {
974 (*regs)[pos++] = tswapreg(env->regs[i]);
975 }
976
977 for (i = 0; i < 6; i++) {
978 (*regs)[pos++] = tswapreg(env->sregs[i]);
979 }
980 }
981
982 #endif /* TARGET_MICROBLAZE */
983
984 #ifdef TARGET_OPENRISC
985
986 #define ELF_START_MMAP 0x08000000
987
988 #define elf_check_arch(x) ((x) == EM_OPENRISC)
989
990 #define ELF_ARCH EM_OPENRISC
991 #define ELF_CLASS ELFCLASS32
992 #define ELF_DATA ELFDATA2MSB
993
994 static inline void init_thread(struct target_pt_regs *regs,
995 struct image_info *infop)
996 {
997 regs->pc = infop->entry;
998 regs->gpr[1] = infop->start_stack;
999 }
1000
1001 #define USE_ELF_CORE_DUMP
1002 #define ELF_EXEC_PAGESIZE 8192
1003
1004 /* See linux kernel arch/openrisc/include/asm/elf.h. */
1005 #define ELF_NREG 34 /* gprs and pc, sr */
1006 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1007
1008 static void elf_core_copy_regs(target_elf_gregset_t *regs,
1009 const CPUOpenRISCState *env)
1010 {
1011 int i;
1012
1013 for (i = 0; i < 32; i++) {
1014 (*regs)[i] = tswapreg(env->gpr[i]);
1015 }
1016
1017 (*regs)[32] = tswapreg(env->pc);
1018 (*regs)[33] = tswapreg(env->sr);
1019 }
1020 #define ELF_HWCAP 0
1021 #define ELF_PLATFORM NULL
1022
1023 #endif /* TARGET_OPENRISC */
1024
1025 #ifdef TARGET_SH4
1026
1027 #define ELF_START_MMAP 0x80000000
1028
1029 #define elf_check_arch(x) ( (x) == EM_SH )
1030
1031 #define ELF_CLASS ELFCLASS32
1032 #define ELF_ARCH EM_SH
1033
1034 static inline void init_thread(struct target_pt_regs *regs,
1035 struct image_info *infop)
1036 {
1037 /* Check other registers XXXXX */
1038 regs->pc = infop->entry;
1039 regs->regs[15] = infop->start_stack;
1040 }
1041
1042 /* See linux kernel: arch/sh/include/asm/elf.h. */
1043 #define ELF_NREG 23
1044 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1045
1046 /* See linux kernel: arch/sh/include/asm/ptrace.h. */
1047 enum {
1048 TARGET_REG_PC = 16,
1049 TARGET_REG_PR = 17,
1050 TARGET_REG_SR = 18,
1051 TARGET_REG_GBR = 19,
1052 TARGET_REG_MACH = 20,
1053 TARGET_REG_MACL = 21,
1054 TARGET_REG_SYSCALL = 22
1055 };
1056
1057 static inline void elf_core_copy_regs(target_elf_gregset_t *regs,
1058 const CPUSH4State *env)
1059 {
1060 int i;
1061
1062 for (i = 0; i < 16; i++) {
1063 (*regs[i]) = tswapreg(env->gregs[i]);
1064 }
1065
1066 (*regs)[TARGET_REG_PC] = tswapreg(env->pc);
1067 (*regs)[TARGET_REG_PR] = tswapreg(env->pr);
1068 (*regs)[TARGET_REG_SR] = tswapreg(env->sr);
1069 (*regs)[TARGET_REG_GBR] = tswapreg(env->gbr);
1070 (*regs)[TARGET_REG_MACH] = tswapreg(env->mach);
1071 (*regs)[TARGET_REG_MACL] = tswapreg(env->macl);
1072 (*regs)[TARGET_REG_SYSCALL] = 0; /* FIXME */
1073 }
1074
1075 #define USE_ELF_CORE_DUMP
1076 #define ELF_EXEC_PAGESIZE 4096
1077
1078 enum {
1079 SH_CPU_HAS_FPU = 0x0001, /* Hardware FPU support */
1080 SH_CPU_HAS_P2_FLUSH_BUG = 0x0002, /* Need to flush the cache in P2 area */
1081 SH_CPU_HAS_MMU_PAGE_ASSOC = 0x0004, /* SH3: TLB way selection bit support */
1082 SH_CPU_HAS_DSP = 0x0008, /* SH-DSP: DSP support */
1083 SH_CPU_HAS_PERF_COUNTER = 0x0010, /* Hardware performance counters */
1084 SH_CPU_HAS_PTEA = 0x0020, /* PTEA register */
1085 SH_CPU_HAS_LLSC = 0x0040, /* movli.l/movco.l */
1086 SH_CPU_HAS_L2_CACHE = 0x0080, /* Secondary cache / URAM */
1087 SH_CPU_HAS_OP32 = 0x0100, /* 32-bit instruction support */
1088 SH_CPU_HAS_PTEAEX = 0x0200, /* PTE ASID Extension support */
1089 };
1090
1091 #define ELF_HWCAP get_elf_hwcap()
1092
1093 static uint32_t get_elf_hwcap(void)
1094 {
1095 SuperHCPU *cpu = SUPERH_CPU(thread_cpu);
1096 uint32_t hwcap = 0;
1097
1098 hwcap |= SH_CPU_HAS_FPU;
1099
1100 if (cpu->env.features & SH_FEATURE_SH4A) {
1101 hwcap |= SH_CPU_HAS_LLSC;
1102 }
1103
1104 return hwcap;
1105 }
1106
1107 #endif
1108
1109 #ifdef TARGET_CRIS
1110
1111 #define ELF_START_MMAP 0x80000000
1112
1113 #define elf_check_arch(x) ( (x) == EM_CRIS )
1114
1115 #define ELF_CLASS ELFCLASS32
1116 #define ELF_ARCH EM_CRIS
1117
1118 static inline void init_thread(struct target_pt_regs *regs,
1119 struct image_info *infop)
1120 {
1121 regs->erp = infop->entry;
1122 }
1123
1124 #define ELF_EXEC_PAGESIZE 8192
1125
1126 #endif
1127
1128 #ifdef TARGET_M68K
1129
1130 #define ELF_START_MMAP 0x80000000
1131
1132 #define elf_check_arch(x) ( (x) == EM_68K )
1133
1134 #define ELF_CLASS ELFCLASS32
1135 #define ELF_ARCH EM_68K
1136
1137 /* ??? Does this need to do anything?
1138 #define ELF_PLAT_INIT(_r) */
1139
1140 static inline void init_thread(struct target_pt_regs *regs,
1141 struct image_info *infop)
1142 {
1143 regs->usp = infop->start_stack;
1144 regs->sr = 0;
1145 regs->pc = infop->entry;
1146 }
1147
1148 /* See linux kernel: arch/m68k/include/asm/elf.h. */
1149 #define ELF_NREG 20
1150 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1151
1152 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUM68KState *env)
1153 {
1154 (*regs)[0] = tswapreg(env->dregs[1]);
1155 (*regs)[1] = tswapreg(env->dregs[2]);
1156 (*regs)[2] = tswapreg(env->dregs[3]);
1157 (*regs)[3] = tswapreg(env->dregs[4]);
1158 (*regs)[4] = tswapreg(env->dregs[5]);
1159 (*regs)[5] = tswapreg(env->dregs[6]);
1160 (*regs)[6] = tswapreg(env->dregs[7]);
1161 (*regs)[7] = tswapreg(env->aregs[0]);
1162 (*regs)[8] = tswapreg(env->aregs[1]);
1163 (*regs)[9] = tswapreg(env->aregs[2]);
1164 (*regs)[10] = tswapreg(env->aregs[3]);
1165 (*regs)[11] = tswapreg(env->aregs[4]);
1166 (*regs)[12] = tswapreg(env->aregs[5]);
1167 (*regs)[13] = tswapreg(env->aregs[6]);
1168 (*regs)[14] = tswapreg(env->dregs[0]);
1169 (*regs)[15] = tswapreg(env->aregs[7]);
1170 (*regs)[16] = tswapreg(env->dregs[0]); /* FIXME: orig_d0 */
1171 (*regs)[17] = tswapreg(env->sr);
1172 (*regs)[18] = tswapreg(env->pc);
1173 (*regs)[19] = 0; /* FIXME: regs->format | regs->vector */
1174 }
1175
1176 #define USE_ELF_CORE_DUMP
1177 #define ELF_EXEC_PAGESIZE 8192
1178
1179 #endif
1180
1181 #ifdef TARGET_ALPHA
1182
1183 #define ELF_START_MMAP (0x30000000000ULL)
1184
1185 #define elf_check_arch(x) ( (x) == ELF_ARCH )
1186
1187 #define ELF_CLASS ELFCLASS64
1188 #define ELF_ARCH EM_ALPHA
1189
1190 static inline void init_thread(struct target_pt_regs *regs,
1191 struct image_info *infop)
1192 {
1193 regs->pc = infop->entry;
1194 regs->ps = 8;
1195 regs->usp = infop->start_stack;
1196 }
1197
1198 #define ELF_EXEC_PAGESIZE 8192
1199
1200 #endif /* TARGET_ALPHA */
1201
1202 #ifdef TARGET_S390X
1203
1204 #define ELF_START_MMAP (0x20000000000ULL)
1205
1206 #define elf_check_arch(x) ( (x) == ELF_ARCH )
1207
1208 #define ELF_CLASS ELFCLASS64
1209 #define ELF_DATA ELFDATA2MSB
1210 #define ELF_ARCH EM_S390
1211
1212 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
1213 {
1214 regs->psw.addr = infop->entry;
1215 regs->psw.mask = PSW_MASK_64 | PSW_MASK_32;
1216 regs->gprs[15] = infop->start_stack;
1217 }
1218
1219 #endif /* TARGET_S390X */
1220
1221 #ifndef ELF_PLATFORM
1222 #define ELF_PLATFORM (NULL)
1223 #endif
1224
1225 #ifndef ELF_HWCAP
1226 #define ELF_HWCAP 0
1227 #endif
1228
1229 #ifdef TARGET_ABI32
1230 #undef ELF_CLASS
1231 #define ELF_CLASS ELFCLASS32
1232 #undef bswaptls
1233 #define bswaptls(ptr) bswap32s(ptr)
1234 #endif
1235
1236 #include "elf.h"
1237
1238 struct exec
1239 {
1240 unsigned int a_info; /* Use macros N_MAGIC, etc for access */
1241 unsigned int a_text; /* length of text, in bytes */
1242 unsigned int a_data; /* length of data, in bytes */
1243 unsigned int a_bss; /* length of uninitialized data area, in bytes */
1244 unsigned int a_syms; /* length of symbol table data in file, in bytes */
1245 unsigned int a_entry; /* start address */
1246 unsigned int a_trsize; /* length of relocation info for text, in bytes */
1247 unsigned int a_drsize; /* length of relocation info for data, in bytes */
1248 };
1249
1250
1251 #define N_MAGIC(exec) ((exec).a_info & 0xffff)
1252 #define OMAGIC 0407
1253 #define NMAGIC 0410
1254 #define ZMAGIC 0413
1255 #define QMAGIC 0314
1256
1257 /* Necessary parameters */
1258 #define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE
1259 #define TARGET_ELF_PAGESTART(_v) ((_v) & \
1260 ~(abi_ulong)(TARGET_ELF_EXEC_PAGESIZE-1))
1261 #define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE-1))
1262
1263 #define DLINFO_ITEMS 14
1264
1265 static inline void memcpy_fromfs(void * to, const void * from, unsigned long n)
1266 {
1267 memcpy(to, from, n);
1268 }
1269
1270 #ifdef BSWAP_NEEDED
1271 static void bswap_ehdr(struct elfhdr *ehdr)
1272 {
1273 bswap16s(&ehdr->e_type); /* Object file type */
1274 bswap16s(&ehdr->e_machine); /* Architecture */
1275 bswap32s(&ehdr->e_version); /* Object file version */
1276 bswaptls(&ehdr->e_entry); /* Entry point virtual address */
1277 bswaptls(&ehdr->e_phoff); /* Program header table file offset */
1278 bswaptls(&ehdr->e_shoff); /* Section header table file offset */
1279 bswap32s(&ehdr->e_flags); /* Processor-specific flags */
1280 bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */
1281 bswap16s(&ehdr->e_phentsize); /* Program header table entry size */
1282 bswap16s(&ehdr->e_phnum); /* Program header table entry count */
1283 bswap16s(&ehdr->e_shentsize); /* Section header table entry size */
1284 bswap16s(&ehdr->e_shnum); /* Section header table entry count */
1285 bswap16s(&ehdr->e_shstrndx); /* Section header string table index */
1286 }
1287
1288 static void bswap_phdr(struct elf_phdr *phdr, int phnum)
1289 {
1290 int i;
1291 for (i = 0; i < phnum; ++i, ++phdr) {
1292 bswap32s(&phdr->p_type); /* Segment type */
1293 bswap32s(&phdr->p_flags); /* Segment flags */
1294 bswaptls(&phdr->p_offset); /* Segment file offset */
1295 bswaptls(&phdr->p_vaddr); /* Segment virtual address */
1296 bswaptls(&phdr->p_paddr); /* Segment physical address */
1297 bswaptls(&phdr->p_filesz); /* Segment size in file */
1298 bswaptls(&phdr->p_memsz); /* Segment size in memory */
1299 bswaptls(&phdr->p_align); /* Segment alignment */
1300 }
1301 }
1302
1303 static void bswap_shdr(struct elf_shdr *shdr, int shnum)
1304 {
1305 int i;
1306 for (i = 0; i < shnum; ++i, ++shdr) {
1307 bswap32s(&shdr->sh_name);
1308 bswap32s(&shdr->sh_type);
1309 bswaptls(&shdr->sh_flags);
1310 bswaptls(&shdr->sh_addr);
1311 bswaptls(&shdr->sh_offset);
1312 bswaptls(&shdr->sh_size);
1313 bswap32s(&shdr->sh_link);
1314 bswap32s(&shdr->sh_info);
1315 bswaptls(&shdr->sh_addralign);
1316 bswaptls(&shdr->sh_entsize);
1317 }
1318 }
1319
1320 static void bswap_sym(struct elf_sym *sym)
1321 {
1322 bswap32s(&sym->st_name);
1323 bswaptls(&sym->st_value);
1324 bswaptls(&sym->st_size);
1325 bswap16s(&sym->st_shndx);
1326 }
1327 #else
1328 static inline void bswap_ehdr(struct elfhdr *ehdr) { }
1329 static inline void bswap_phdr(struct elf_phdr *phdr, int phnum) { }
1330 static inline void bswap_shdr(struct elf_shdr *shdr, int shnum) { }
1331 static inline void bswap_sym(struct elf_sym *sym) { }
1332 #endif
1333
1334 #ifdef USE_ELF_CORE_DUMP
1335 static int elf_core_dump(int, const CPUArchState *);
1336 #endif /* USE_ELF_CORE_DUMP */
1337 static void load_symbols(struct elfhdr *hdr, int fd, abi_ulong load_bias);
1338
1339 /* Verify the portions of EHDR within E_IDENT for the target.
1340 This can be performed before bswapping the entire header. */
1341 static bool elf_check_ident(struct elfhdr *ehdr)
1342 {
1343 return (ehdr->e_ident[EI_MAG0] == ELFMAG0
1344 && ehdr->e_ident[EI_MAG1] == ELFMAG1
1345 && ehdr->e_ident[EI_MAG2] == ELFMAG2
1346 && ehdr->e_ident[EI_MAG3] == ELFMAG3
1347 && ehdr->e_ident[EI_CLASS] == ELF_CLASS
1348 && ehdr->e_ident[EI_DATA] == ELF_DATA
1349 && ehdr->e_ident[EI_VERSION] == EV_CURRENT);
1350 }
1351
1352 /* Verify the portions of EHDR outside of E_IDENT for the target.
1353 This has to wait until after bswapping the header. */
1354 static bool elf_check_ehdr(struct elfhdr *ehdr)
1355 {
1356 return (elf_check_arch(ehdr->e_machine)
1357 && ehdr->e_ehsize == sizeof(struct elfhdr)
1358 && ehdr->e_phentsize == sizeof(struct elf_phdr)
1359 && (ehdr->e_type == ET_EXEC || ehdr->e_type == ET_DYN));
1360 }
1361
1362 /*
1363 * 'copy_elf_strings()' copies argument/envelope strings from user
1364 * memory to free pages in kernel mem. These are in a format ready
1365 * to be put directly into the top of new user memory.
1366 *
1367 */
1368 static abi_ulong copy_elf_strings(int argc,char ** argv, void **page,
1369 abi_ulong p)
1370 {
1371 char *tmp, *tmp1, *pag = NULL;
1372 int len, offset = 0;
1373
1374 if (!p) {
1375 return 0; /* bullet-proofing */
1376 }
1377 while (argc-- > 0) {
1378 tmp = argv[argc];
1379 if (!tmp) {
1380 fprintf(stderr, "VFS: argc is wrong");
1381 exit(-1);
1382 }
1383 tmp1 = tmp;
1384 while (*tmp++);
1385 len = tmp - tmp1;
1386 if (p < len) { /* this shouldn't happen - 128kB */
1387 return 0;
1388 }
1389 while (len) {
1390 --p; --tmp; --len;
1391 if (--offset < 0) {
1392 offset = p % TARGET_PAGE_SIZE;
1393 pag = (char *)page[p/TARGET_PAGE_SIZE];
1394 if (!pag) {
1395 pag = g_try_malloc0(TARGET_PAGE_SIZE);
1396 page[p/TARGET_PAGE_SIZE] = pag;
1397 if (!pag)
1398 return 0;
1399 }
1400 }
1401 if (len == 0 || offset == 0) {
1402 *(pag + offset) = *tmp;
1403 }
1404 else {
1405 int bytes_to_copy = (len > offset) ? offset : len;
1406 tmp -= bytes_to_copy;
1407 p -= bytes_to_copy;
1408 offset -= bytes_to_copy;
1409 len -= bytes_to_copy;
1410 memcpy_fromfs(pag + offset, tmp, bytes_to_copy + 1);
1411 }
1412 }
1413 }
1414 return p;
1415 }
1416
1417 static abi_ulong setup_arg_pages(abi_ulong p, struct linux_binprm *bprm,
1418 struct image_info *info)
1419 {
1420 abi_ulong stack_base, size, error, guard;
1421 int i;
1422
1423 /* Create enough stack to hold everything. If we don't use
1424 it for args, we'll use it for something else. */
1425 size = guest_stack_size;
1426 if (size < MAX_ARG_PAGES*TARGET_PAGE_SIZE) {
1427 size = MAX_ARG_PAGES*TARGET_PAGE_SIZE;
1428 }
1429 guard = TARGET_PAGE_SIZE;
1430 if (guard < qemu_real_host_page_size) {
1431 guard = qemu_real_host_page_size;
1432 }
1433
1434 error = target_mmap(0, size + guard, PROT_READ | PROT_WRITE,
1435 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
1436 if (error == -1) {
1437 perror("mmap stack");
1438 exit(-1);
1439 }
1440
1441 /* We reserve one extra page at the top of the stack as guard. */
1442 target_mprotect(error, guard, PROT_NONE);
1443
1444 info->stack_limit = error + guard;
1445 stack_base = info->stack_limit + size - MAX_ARG_PAGES*TARGET_PAGE_SIZE;
1446 p += stack_base;
1447
1448 for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
1449 if (bprm->page[i]) {
1450 info->rss++;
1451 /* FIXME - check return value of memcpy_to_target() for failure */
1452 memcpy_to_target(stack_base, bprm->page[i], TARGET_PAGE_SIZE);
1453 g_free(bprm->page[i]);
1454 }
1455 stack_base += TARGET_PAGE_SIZE;
1456 }
1457 return p;
1458 }
1459
1460 /* Map and zero the bss. We need to explicitly zero any fractional pages
1461 after the data section (i.e. bss). */
1462 static void zero_bss(abi_ulong elf_bss, abi_ulong last_bss, int prot)
1463 {
1464 uintptr_t host_start, host_map_start, host_end;
1465
1466 last_bss = TARGET_PAGE_ALIGN(last_bss);
1467
1468 /* ??? There is confusion between qemu_real_host_page_size and
1469 qemu_host_page_size here and elsewhere in target_mmap, which
1470 may lead to the end of the data section mapping from the file
1471 not being mapped. At least there was an explicit test and
1472 comment for that here, suggesting that "the file size must
1473 be known". The comment probably pre-dates the introduction
1474 of the fstat system call in target_mmap which does in fact
1475 find out the size. What isn't clear is if the workaround
1476 here is still actually needed. For now, continue with it,
1477 but merge it with the "normal" mmap that would allocate the bss. */
1478
1479 host_start = (uintptr_t) g2h(elf_bss);
1480 host_end = (uintptr_t) g2h(last_bss);
1481 host_map_start = (host_start + qemu_real_host_page_size - 1);
1482 host_map_start &= -qemu_real_host_page_size;
1483
1484 if (host_map_start < host_end) {
1485 void *p = mmap((void *)host_map_start, host_end - host_map_start,
1486 prot, MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
1487 if (p == MAP_FAILED) {
1488 perror("cannot mmap brk");
1489 exit(-1);
1490 }
1491 }
1492
1493 /* Ensure that the bss page(s) are valid */
1494 if ((page_get_flags(last_bss-1) & prot) != prot) {
1495 page_set_flags(elf_bss & TARGET_PAGE_MASK, last_bss, prot | PAGE_VALID);
1496 }
1497
1498 if (host_start < host_map_start) {
1499 memset((void *)host_start, 0, host_map_start - host_start);
1500 }
1501 }
1502
1503 #ifdef CONFIG_USE_FDPIC
1504 static abi_ulong loader_build_fdpic_loadmap(struct image_info *info, abi_ulong sp)
1505 {
1506 uint16_t n;
1507 struct elf32_fdpic_loadseg *loadsegs = info->loadsegs;
1508
1509 /* elf32_fdpic_loadseg */
1510 n = info->nsegs;
1511 while (n--) {
1512 sp -= 12;
1513 put_user_u32(loadsegs[n].addr, sp+0);
1514 put_user_u32(loadsegs[n].p_vaddr, sp+4);
1515 put_user_u32(loadsegs[n].p_memsz, sp+8);
1516 }
1517
1518 /* elf32_fdpic_loadmap */
1519 sp -= 4;
1520 put_user_u16(0, sp+0); /* version */
1521 put_user_u16(info->nsegs, sp+2); /* nsegs */
1522
1523 info->personality = PER_LINUX_FDPIC;
1524 info->loadmap_addr = sp;
1525
1526 return sp;
1527 }
1528 #endif
1529
1530 static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
1531 struct elfhdr *exec,
1532 struct image_info *info,
1533 struct image_info *interp_info)
1534 {
1535 abi_ulong sp;
1536 abi_ulong sp_auxv;
1537 int size;
1538 int i;
1539 abi_ulong u_rand_bytes;
1540 uint8_t k_rand_bytes[16];
1541 abi_ulong u_platform;
1542 const char *k_platform;
1543 const int n = sizeof(elf_addr_t);
1544
1545 sp = p;
1546
1547 #ifdef CONFIG_USE_FDPIC
1548 /* Needs to be before we load the env/argc/... */
1549 if (elf_is_fdpic(exec)) {
1550 /* Need 4 byte alignment for these structs */
1551 sp &= ~3;
1552 sp = loader_build_fdpic_loadmap(info, sp);
1553 info->other_info = interp_info;
1554 if (interp_info) {
1555 interp_info->other_info = info;
1556 sp = loader_build_fdpic_loadmap(interp_info, sp);
1557 }
1558 }
1559 #endif
1560
1561 u_platform = 0;
1562 k_platform = ELF_PLATFORM;
1563 if (k_platform) {
1564 size_t len = strlen(k_platform) + 1;
1565 sp -= (len + n - 1) & ~(n - 1);
1566 u_platform = sp;
1567 /* FIXME - check return value of memcpy_to_target() for failure */
1568 memcpy_to_target(sp, k_platform, len);
1569 }
1570
1571 /*
1572 * Generate 16 random bytes for userspace PRNG seeding (not
1573 * cryptically secure but it's not the aim of QEMU).
1574 */
1575 for (i = 0; i < 16; i++) {
1576 k_rand_bytes[i] = rand();
1577 }
1578 sp -= 16;
1579 u_rand_bytes = sp;
1580 /* FIXME - check return value of memcpy_to_target() for failure */
1581 memcpy_to_target(sp, k_rand_bytes, 16);
1582
1583 /*
1584 * Force 16 byte _final_ alignment here for generality.
1585 */
1586 sp = sp &~ (abi_ulong)15;
1587 size = (DLINFO_ITEMS + 1) * 2;
1588 if (k_platform)
1589 size += 2;
1590 #ifdef DLINFO_ARCH_ITEMS
1591 size += DLINFO_ARCH_ITEMS * 2;
1592 #endif
1593 #ifdef ELF_HWCAP2
1594 size += 2;
1595 #endif
1596 size += envc + argc + 2;
1597 size += 1; /* argc itself */
1598 size *= n;
1599 if (size & 15)
1600 sp -= 16 - (size & 15);
1601
1602 /* This is correct because Linux defines
1603 * elf_addr_t as Elf32_Off / Elf64_Off
1604 */
1605 #define NEW_AUX_ENT(id, val) do { \
1606 sp -= n; put_user_ual(val, sp); \
1607 sp -= n; put_user_ual(id, sp); \
1608 } while(0)
1609
1610 sp_auxv = sp;
1611 NEW_AUX_ENT (AT_NULL, 0);
1612
1613 /* There must be exactly DLINFO_ITEMS entries here. */
1614 NEW_AUX_ENT(AT_PHDR, (abi_ulong)(info->load_addr + exec->e_phoff));
1615 NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof (struct elf_phdr)));
1616 NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum));
1617 NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(MAX(TARGET_PAGE_SIZE, getpagesize())));
1618 NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_info ? interp_info->load_addr : 0));
1619 NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0);
1620 NEW_AUX_ENT(AT_ENTRY, info->entry);
1621 NEW_AUX_ENT(AT_UID, (abi_ulong) getuid());
1622 NEW_AUX_ENT(AT_EUID, (abi_ulong) geteuid());
1623 NEW_AUX_ENT(AT_GID, (abi_ulong) getgid());
1624 NEW_AUX_ENT(AT_EGID, (abi_ulong) getegid());
1625 NEW_AUX_ENT(AT_HWCAP, (abi_ulong) ELF_HWCAP);
1626 NEW_AUX_ENT(AT_CLKTCK, (abi_ulong) sysconf(_SC_CLK_TCK));
1627 NEW_AUX_ENT(AT_RANDOM, (abi_ulong) u_rand_bytes);
1628
1629 #ifdef ELF_HWCAP2
1630 NEW_AUX_ENT(AT_HWCAP2, (abi_ulong) ELF_HWCAP2);
1631 #endif
1632
1633 if (k_platform)
1634 NEW_AUX_ENT(AT_PLATFORM, u_platform);
1635 #ifdef ARCH_DLINFO
1636 /*
1637 * ARCH_DLINFO must come last so platform specific code can enforce
1638 * special alignment requirements on the AUXV if necessary (eg. PPC).
1639 */
1640 ARCH_DLINFO;
1641 #endif
1642 #undef NEW_AUX_ENT
1643
1644 info->saved_auxv = sp;
1645 info->auxv_len = sp_auxv - sp;
1646
1647 sp = loader_build_argptr(envc, argc, sp, p, 0);
1648 /* Check the right amount of stack was allocated for auxvec, envp & argv. */
1649 assert(sp_auxv - sp == size);
1650 return sp;
1651 }
1652
1653 #ifndef TARGET_HAS_VALIDATE_GUEST_SPACE
1654 /* If the guest doesn't have a validation function just agree */
1655 static int validate_guest_space(unsigned long guest_base,
1656 unsigned long guest_size)
1657 {
1658 return 1;
1659 }
1660 #endif
1661
1662 unsigned long init_guest_space(unsigned long host_start,
1663 unsigned long host_size,
1664 unsigned long guest_start,
1665 bool fixed)
1666 {
1667 unsigned long current_start, real_start;
1668 int flags;
1669
1670 assert(host_start || host_size);
1671
1672 /* If just a starting address is given, then just verify that
1673 * address. */
1674 if (host_start && !host_size) {
1675 if (validate_guest_space(host_start, host_size) == 1) {
1676 return host_start;
1677 } else {
1678 return (unsigned long)-1;
1679 }
1680 }
1681
1682 /* Setup the initial flags and start address. */
1683 current_start = host_start & qemu_host_page_mask;
1684 flags = MAP_ANONYMOUS | MAP_PRIVATE | MAP_NORESERVE;
1685 if (fixed) {
1686 flags |= MAP_FIXED;
1687 }
1688
1689 /* Otherwise, a non-zero size region of memory needs to be mapped
1690 * and validated. */
1691 while (1) {
1692 unsigned long real_size = host_size;
1693
1694 /* Do not use mmap_find_vma here because that is limited to the
1695 * guest address space. We are going to make the
1696 * guest address space fit whatever we're given.
1697 */
1698 real_start = (unsigned long)
1699 mmap((void *)current_start, host_size, PROT_NONE, flags, -1, 0);
1700 if (real_start == (unsigned long)-1) {
1701 return (unsigned long)-1;
1702 }
1703
1704 /* Ensure the address is properly aligned. */
1705 if (real_start & ~qemu_host_page_mask) {
1706 munmap((void *)real_start, host_size);
1707 real_size = host_size + qemu_host_page_size;
1708 real_start = (unsigned long)
1709 mmap((void *)real_start, real_size, PROT_NONE, flags, -1, 0);
1710 if (real_start == (unsigned long)-1) {
1711 return (unsigned long)-1;
1712 }
1713 real_start = HOST_PAGE_ALIGN(real_start);
1714 }
1715
1716 /* Check to see if the address is valid. */
1717 if (!host_start || real_start == current_start) {
1718 int valid = validate_guest_space(real_start - guest_start,
1719 real_size);
1720 if (valid == 1) {
1721 break;
1722 } else if (valid == -1) {
1723 return (unsigned long)-1;
1724 }
1725 /* valid == 0, so try again. */
1726 }
1727
1728 /* That address didn't work. Unmap and try a different one.
1729 * The address the host picked because is typically right at
1730 * the top of the host address space and leaves the guest with
1731 * no usable address space. Resort to a linear search. We
1732 * already compensated for mmap_min_addr, so this should not
1733 * happen often. Probably means we got unlucky and host
1734 * address space randomization put a shared library somewhere
1735 * inconvenient.
1736 */
1737 munmap((void *)real_start, host_size);
1738 current_start += qemu_host_page_size;
1739 if (host_start == current_start) {
1740 /* Theoretically possible if host doesn't have any suitably
1741 * aligned areas. Normally the first mmap will fail.
1742 */
1743 return (unsigned long)-1;
1744 }
1745 }
1746
1747 qemu_log("Reserved 0x%lx bytes of guest address space\n", host_size);
1748
1749 return real_start;
1750 }
1751
1752 static void probe_guest_base(const char *image_name,
1753 abi_ulong loaddr, abi_ulong hiaddr)
1754 {
1755 /* Probe for a suitable guest base address, if the user has not set
1756 * it explicitly, and set guest_base appropriately.
1757 * In case of error we will print a suitable message and exit.
1758 */
1759 #if defined(CONFIG_USE_GUEST_BASE)
1760 const char *errmsg;
1761 if (!have_guest_base && !reserved_va) {
1762 unsigned long host_start, real_start, host_size;
1763
1764 /* Round addresses to page boundaries. */
1765 loaddr &= qemu_host_page_mask;
1766 hiaddr = HOST_PAGE_ALIGN(hiaddr);
1767
1768 if (loaddr < mmap_min_addr) {
1769 host_start = HOST_PAGE_ALIGN(mmap_min_addr);
1770 } else {
1771 host_start = loaddr;
1772 if (host_start != loaddr) {
1773 errmsg = "Address overflow loading ELF binary";
1774 goto exit_errmsg;
1775 }
1776 }
1777 host_size = hiaddr - loaddr;
1778
1779 /* Setup the initial guest memory space with ranges gleaned from
1780 * the ELF image that is being loaded.
1781 */
1782 real_start = init_guest_space(host_start, host_size, loaddr, false);
1783 if (real_start == (unsigned long)-1) {
1784 errmsg = "Unable to find space for application";
1785 goto exit_errmsg;
1786 }
1787 guest_base = real_start - loaddr;
1788
1789 qemu_log("Relocating guest address space from 0x"
1790 TARGET_ABI_FMT_lx " to 0x%lx\n",
1791 loaddr, real_start);
1792 }
1793 return;
1794
1795 exit_errmsg:
1796 fprintf(stderr, "%s: %s\n", image_name, errmsg);
1797 exit(-1);
1798 #endif
1799 }
1800
1801
1802 /* Load an ELF image into the address space.
1803
1804 IMAGE_NAME is the filename of the image, to use in error messages.
1805 IMAGE_FD is the open file descriptor for the image.
1806
1807 BPRM_BUF is a copy of the beginning of the file; this of course
1808 contains the elf file header at offset 0. It is assumed that this
1809 buffer is sufficiently aligned to present no problems to the host
1810 in accessing data at aligned offsets within the buffer.
1811
1812 On return: INFO values will be filled in, as necessary or available. */
1813
1814 static void load_elf_image(const char *image_name, int image_fd,
1815 struct image_info *info, char **pinterp_name,
1816 char bprm_buf[BPRM_BUF_SIZE])
1817 {
1818 struct elfhdr *ehdr = (struct elfhdr *)bprm_buf;
1819 struct elf_phdr *phdr;
1820 abi_ulong load_addr, load_bias, loaddr, hiaddr, error;
1821 int i, retval;
1822 const char *errmsg;
1823
1824 /* First of all, some simple consistency checks */
1825 errmsg = "Invalid ELF image for this architecture";
1826 if (!elf_check_ident(ehdr)) {
1827 goto exit_errmsg;
1828 }
1829 bswap_ehdr(ehdr);
1830 if (!elf_check_ehdr(ehdr)) {
1831 goto exit_errmsg;
1832 }
1833
1834 i = ehdr->e_phnum * sizeof(struct elf_phdr);
1835 if (ehdr->e_phoff + i <= BPRM_BUF_SIZE) {
1836 phdr = (struct elf_phdr *)(bprm_buf + ehdr->e_phoff);
1837 } else {
1838 phdr = (struct elf_phdr *) alloca(i);
1839 retval = pread(image_fd, phdr, i, ehdr->e_phoff);
1840 if (retval != i) {
1841 goto exit_read;
1842 }
1843 }
1844 bswap_phdr(phdr, ehdr->e_phnum);
1845
1846 #ifdef CONFIG_USE_FDPIC
1847 info->nsegs = 0;
1848 info->pt_dynamic_addr = 0;
1849 #endif
1850
1851 /* Find the maximum size of the image and allocate an appropriate
1852 amount of memory to handle that. */
1853 loaddr = -1, hiaddr = 0;
1854 for (i = 0; i < ehdr->e_phnum; ++i) {
1855 if (phdr[i].p_type == PT_LOAD) {
1856 abi_ulong a = phdr[i].p_vaddr - phdr[i].p_offset;
1857 if (a < loaddr) {
1858 loaddr = a;
1859 }
1860 a = phdr[i].p_vaddr + phdr[i].p_memsz;
1861 if (a > hiaddr) {
1862 hiaddr = a;
1863 }
1864 #ifdef CONFIG_USE_FDPIC
1865 ++info->nsegs;
1866 #endif
1867 }
1868 }
1869
1870 load_addr = loaddr;
1871 if (ehdr->e_type == ET_DYN) {
1872 /* The image indicates that it can be loaded anywhere. Find a
1873 location that can hold the memory space required. If the
1874 image is pre-linked, LOADDR will be non-zero. Since we do
1875 not supply MAP_FIXED here we'll use that address if and
1876 only if it remains available. */
1877 load_addr = target_mmap(loaddr, hiaddr - loaddr, PROT_NONE,
1878 MAP_PRIVATE | MAP_ANON | MAP_NORESERVE,
1879 -1, 0);
1880 if (load_addr == -1) {
1881 goto exit_perror;
1882 }
1883 } else if (pinterp_name != NULL) {
1884 /* This is the main executable. Make sure that the low
1885 address does not conflict with MMAP_MIN_ADDR or the
1886 QEMU application itself. */
1887 probe_guest_base(image_name, loaddr, hiaddr);
1888 }
1889 load_bias = load_addr - loaddr;
1890
1891 #ifdef CONFIG_USE_FDPIC
1892 {
1893 struct elf32_fdpic_loadseg *loadsegs = info->loadsegs =
1894 g_malloc(sizeof(*loadsegs) * info->nsegs);
1895
1896 for (i = 0; i < ehdr->e_phnum; ++i) {
1897 switch (phdr[i].p_type) {
1898 case PT_DYNAMIC:
1899 info->pt_dynamic_addr = phdr[i].p_vaddr + load_bias;
1900 break;
1901 case PT_LOAD:
1902 loadsegs->addr = phdr[i].p_vaddr + load_bias;
1903 loadsegs->p_vaddr = phdr[i].p_vaddr;
1904 loadsegs->p_memsz = phdr[i].p_memsz;
1905 ++loadsegs;
1906 break;
1907 }
1908 }
1909 }
1910 #endif
1911
1912 info->load_bias = load_bias;
1913 info->load_addr = load_addr;
1914 info->entry = ehdr->e_entry + load_bias;
1915 info->start_code = -1;
1916 info->end_code = 0;
1917 info->start_data = -1;
1918 info->end_data = 0;
1919 info->brk = 0;
1920 info->elf_flags = ehdr->e_flags;
1921
1922 for (i = 0; i < ehdr->e_phnum; i++) {
1923 struct elf_phdr *eppnt = phdr + i;
1924 if (eppnt->p_type == PT_LOAD) {
1925 abi_ulong vaddr, vaddr_po, vaddr_ps, vaddr_ef, vaddr_em;
1926 int elf_prot = 0;
1927
1928 if (eppnt->p_flags & PF_R) elf_prot = PROT_READ;
1929 if (eppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
1930 if (eppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
1931
1932 vaddr = load_bias + eppnt->p_vaddr;
1933 vaddr_po = TARGET_ELF_PAGEOFFSET(vaddr);
1934 vaddr_ps = TARGET_ELF_PAGESTART(vaddr);
1935
1936 error = target_mmap(vaddr_ps, eppnt->p_filesz + vaddr_po,
1937 elf_prot, MAP_PRIVATE | MAP_FIXED,
1938 image_fd, eppnt->p_offset - vaddr_po);
1939 if (error == -1) {
1940 goto exit_perror;
1941 }
1942
1943 vaddr_ef = vaddr + eppnt->p_filesz;
1944 vaddr_em = vaddr + eppnt->p_memsz;
1945
1946 /* If the load segment requests extra zeros (e.g. bss), map it. */
1947 if (vaddr_ef < vaddr_em) {
1948 zero_bss(vaddr_ef, vaddr_em, elf_prot);
1949 }
1950
1951 /* Find the full program boundaries. */
1952 if (elf_prot & PROT_EXEC) {
1953 if (vaddr < info->start_code) {
1954 info->start_code = vaddr;
1955 }
1956 if (vaddr_ef > info->end_code) {
1957 info->end_code = vaddr_ef;
1958 }
1959 }
1960 if (elf_prot & PROT_WRITE) {
1961 if (vaddr < info->start_data) {
1962 info->start_data = vaddr;
1963 }
1964 if (vaddr_ef > info->end_data) {
1965 info->end_data = vaddr_ef;
1966 }
1967 if (vaddr_em > info->brk) {
1968 info->brk = vaddr_em;
1969 }
1970 }
1971 } else if (eppnt->p_type == PT_INTERP && pinterp_name) {
1972 char *interp_name;
1973
1974 if (*pinterp_name) {
1975 errmsg = "Multiple PT_INTERP entries";
1976 goto exit_errmsg;
1977 }
1978 interp_name = malloc(eppnt->p_filesz);
1979 if (!interp_name) {
1980 goto exit_perror;
1981 }
1982
1983 if (eppnt->p_offset + eppnt->p_filesz <= BPRM_BUF_SIZE) {
1984 memcpy(interp_name, bprm_buf + eppnt->p_offset,
1985 eppnt->p_filesz);
1986 } else {
1987 retval = pread(image_fd, interp_name, eppnt->p_filesz,
1988 eppnt->p_offset);
1989 if (retval != eppnt->p_filesz) {
1990 goto exit_perror;
1991 }
1992 }
1993 if (interp_name[eppnt->p_filesz - 1] != 0) {
1994 errmsg = "Invalid PT_INTERP entry";
1995 goto exit_errmsg;
1996 }
1997 *pinterp_name = interp_name;
1998 }
1999 }
2000
2001 if (info->end_data == 0) {
2002 info->start_data = info->end_code;
2003 info->end_data = info->end_code;
2004 info->brk = info->end_code;
2005 }
2006
2007 if (qemu_log_enabled()) {
2008 load_symbols(ehdr, image_fd, load_bias);
2009 }
2010
2011 close(image_fd);
2012 return;
2013
2014 exit_read:
2015 if (retval >= 0) {
2016 errmsg = "Incomplete read of file header";
2017 goto exit_errmsg;
2018 }
2019 exit_perror:
2020 errmsg = strerror(errno);
2021 exit_errmsg:
2022 fprintf(stderr, "%s: %s\n", image_name, errmsg);
2023 exit(-1);
2024 }
2025
2026 static void load_elf_interp(const char *filename, struct image_info *info,
2027 char bprm_buf[BPRM_BUF_SIZE])
2028 {
2029 int fd, retval;
2030
2031 fd = open(path(filename), O_RDONLY);
2032 if (fd < 0) {
2033 goto exit_perror;
2034 }
2035
2036 retval = read(fd, bprm_buf, BPRM_BUF_SIZE);
2037 if (retval < 0) {
2038 goto exit_perror;
2039 }
2040 if (retval < BPRM_BUF_SIZE) {
2041 memset(bprm_buf + retval, 0, BPRM_BUF_SIZE - retval);
2042 }
2043
2044 load_elf_image(filename, fd, info, NULL, bprm_buf);
2045 return;
2046
2047 exit_perror:
2048 fprintf(stderr, "%s: %s\n", filename, strerror(errno));
2049 exit(-1);
2050 }
2051
2052 static int symfind(const void *s0, const void *s1)
2053 {
2054 target_ulong addr = *(target_ulong *)s0;
2055 struct elf_sym *sym = (struct elf_sym *)s1;
2056 int result = 0;
2057 if (addr < sym->st_value) {
2058 result = -1;
2059 } else if (addr >= sym->st_value + sym->st_size) {
2060 result = 1;
2061 }
2062 return result;
2063 }
2064
2065 static const char *lookup_symbolxx(struct syminfo *s, target_ulong orig_addr)
2066 {
2067 #if ELF_CLASS == ELFCLASS32
2068 struct elf_sym *syms = s->disas_symtab.elf32;
2069 #else
2070 struct elf_sym *syms = s->disas_symtab.elf64;
2071 #endif
2072
2073 // binary search
2074 struct elf_sym *sym;
2075
2076 sym = bsearch(&orig_addr, syms, s->disas_num_syms, sizeof(*syms), symfind);
2077 if (sym != NULL) {
2078 return s->disas_strtab + sym->st_name;
2079 }
2080
2081 return "";
2082 }
2083
2084 /* FIXME: This should use elf_ops.h */
2085 static int symcmp(const void *s0, const void *s1)
2086 {
2087 struct elf_sym *sym0 = (struct elf_sym *)s0;
2088 struct elf_sym *sym1 = (struct elf_sym *)s1;
2089 return (sym0->st_value < sym1->st_value)
2090 ? -1
2091 : ((sym0->st_value > sym1->st_value) ? 1 : 0);
2092 }
2093
2094 /* Best attempt to load symbols from this ELF object. */
2095 static void load_symbols(struct elfhdr *hdr, int fd, abi_ulong load_bias)
2096 {
2097 int i, shnum, nsyms, sym_idx = 0, str_idx = 0;
2098 struct elf_shdr *shdr;
2099 char *strings = NULL;
2100 struct syminfo *s = NULL;
2101 struct elf_sym *new_syms, *syms = NULL;
2102
2103 shnum = hdr->e_shnum;
2104 i = shnum * sizeof(struct elf_shdr);
2105 shdr = (struct elf_shdr *)alloca(i);
2106 if (pread(fd, shdr, i, hdr->e_shoff) != i) {
2107 return;
2108 }
2109
2110 bswap_shdr(shdr, shnum);
2111 for (i = 0; i < shnum; ++i) {
2112 if (shdr[i].sh_type == SHT_SYMTAB) {
2113 sym_idx = i;
2114 str_idx = shdr[i].sh_link;
2115 goto found;
2116 }
2117 }
2118
2119 /* There will be no symbol table if the file was stripped. */
2120 return;
2121
2122 found:
2123 /* Now know where the strtab and symtab are. Snarf them. */
2124 s = malloc(sizeof(*s));
2125 if (!s) {
2126 goto give_up;
2127 }
2128
2129 i = shdr[str_idx].sh_size;
2130 s->disas_strtab = strings = malloc(i);
2131 if (!strings || pread(fd, strings, i, shdr[str_idx].sh_offset) != i) {
2132 goto give_up;
2133 }
2134
2135 i = shdr[sym_idx].sh_size;
2136 syms = malloc(i);
2137 if (!syms || pread(fd, syms, i, shdr[sym_idx].sh_offset) != i) {
2138 goto give_up;
2139 }
2140
2141 nsyms = i / sizeof(struct elf_sym);
2142 for (i = 0; i < nsyms; ) {
2143 bswap_sym(syms + i);
2144 /* Throw away entries which we do not need. */
2145 if (syms[i].st_shndx == SHN_UNDEF
2146 || syms[i].st_shndx >= SHN_LORESERVE
2147 || ELF_ST_TYPE(syms[i].st_info) != STT_FUNC) {
2148 if (i < --nsyms) {
2149 syms[i] = syms[nsyms];
2150 }
2151 } else {
2152 #if defined(TARGET_ARM) || defined (TARGET_MIPS)
2153 /* The bottom address bit marks a Thumb or MIPS16 symbol. */
2154 syms[i].st_value &= ~(target_ulong)1;
2155 #endif
2156 syms[i].st_value += load_bias;
2157 i++;
2158 }
2159 }
2160
2161 /* No "useful" symbol. */
2162 if (nsyms == 0) {
2163 goto give_up;
2164 }
2165
2166 /* Attempt to free the storage associated with the local symbols
2167 that we threw away. Whether or not this has any effect on the
2168 memory allocation depends on the malloc implementation and how
2169 many symbols we managed to discard. */
2170 new_syms = realloc(syms, nsyms * sizeof(*syms));
2171 if (new_syms == NULL) {
2172 goto give_up;
2173 }
2174 syms = new_syms;
2175
2176 qsort(syms, nsyms, sizeof(*syms), symcmp);
2177
2178 s->disas_num_syms = nsyms;
2179 #if ELF_CLASS == ELFCLASS32
2180 s->disas_symtab.elf32 = syms;
2181 #else
2182 s->disas_symtab.elf64 = syms;
2183 #endif
2184 s->lookup_symbol = lookup_symbolxx;
2185 s->next = syminfos;
2186 syminfos = s;
2187
2188 return;
2189
2190 give_up:
2191 free(s);
2192 free(strings);
2193 free(syms);
2194 }
2195
2196 int load_elf_binary(struct linux_binprm *bprm, struct image_info *info)
2197 {
2198 struct image_info interp_info;
2199 struct elfhdr elf_ex;
2200 char *elf_interpreter = NULL;
2201
2202 info->start_mmap = (abi_ulong)ELF_START_MMAP;
2203 info->mmap = 0;
2204 info->rss = 0;
2205
2206 load_elf_image(bprm->filename, bprm->fd, info,
2207 &elf_interpreter, bprm->buf);
2208
2209 /* ??? We need a copy of the elf header for passing to create_elf_tables.
2210 If we do nothing, we'll have overwritten this when we re-use bprm->buf
2211 when we load the interpreter. */
2212 elf_ex = *(struct elfhdr *)bprm->buf;
2213
2214 bprm->p = copy_elf_strings(1, &bprm->filename, bprm->page, bprm->p);
2215 bprm->p = copy_elf_strings(bprm->envc,bprm->envp,bprm->page,bprm->p);
2216 bprm->p = copy_elf_strings(bprm->argc,bprm->argv,bprm->page,bprm->p);
2217 if (!bprm->p) {
2218 fprintf(stderr, "%s: %s\n", bprm->filename, strerror(E2BIG));
2219 exit(-1);
2220 }
2221
2222 /* Do this so that we can load the interpreter, if need be. We will
2223 change some of these later */
2224 bprm->p = setup_arg_pages(bprm->p, bprm, info);
2225
2226 if (elf_interpreter) {
2227 load_elf_interp(elf_interpreter, &interp_info, bprm->buf);
2228
2229 /* If the program interpreter is one of these two, then assume
2230 an iBCS2 image. Otherwise assume a native linux image. */
2231
2232 if (strcmp(elf_interpreter, "/usr/lib/libc.so.1") == 0
2233 || strcmp(elf_interpreter, "/usr/lib/ld.so.1") == 0) {
2234 info->personality = PER_SVR4;
2235
2236 /* Why this, you ask??? Well SVr4 maps page 0 as read-only,
2237 and some applications "depend" upon this behavior. Since
2238 we do not have the power to recompile these, we emulate
2239 the SVr4 behavior. Sigh. */
2240 target_mmap(0, qemu_host_page_size, PROT_READ | PROT_EXEC,
2241 MAP_FIXED | MAP_PRIVATE, -1, 0);
2242 }
2243 }
2244
2245 bprm->p = create_elf_tables(bprm->p, bprm->argc, bprm->envc, &elf_ex,
2246 info, (elf_interpreter ? &interp_info : NULL));
2247 info->start_stack = bprm->p;
2248
2249 /* If we have an interpreter, set that as the program's entry point.
2250 Copy the load_bias as well, to help PPC64 interpret the entry
2251 point as a function descriptor. Do this after creating elf tables
2252 so that we copy the original program entry point into the AUXV. */
2253 if (elf_interpreter) {
2254 info->load_bias = interp_info.load_bias;
2255 info->entry = interp_info.entry;
2256 free(elf_interpreter);
2257 }
2258
2259 #ifdef USE_ELF_CORE_DUMP
2260 bprm->core_dump = &elf_core_dump;
2261 #endif
2262
2263 return 0;
2264 }
2265
2266 #ifdef USE_ELF_CORE_DUMP
2267 /*
2268 * Definitions to generate Intel SVR4-like core files.
2269 * These mostly have the same names as the SVR4 types with "target_elf_"
2270 * tacked on the front to prevent clashes with linux definitions,
2271 * and the typedef forms have been avoided. This is mostly like
2272 * the SVR4 structure, but more Linuxy, with things that Linux does
2273 * not support and which gdb doesn't really use excluded.
2274 *
2275 * Fields we don't dump (their contents is zero) in linux-user qemu
2276 * are marked with XXX.
2277 *
2278 * Core dump code is copied from linux kernel (fs/binfmt_elf.c).
2279 *
2280 * Porting ELF coredump for target is (quite) simple process. First you
2281 * define USE_ELF_CORE_DUMP in target ELF code (where init_thread() for
2282 * the target resides):
2283 *
2284 * #define USE_ELF_CORE_DUMP
2285 *
2286 * Next you define type of register set used for dumping. ELF specification
2287 * says that it needs to be array of elf_greg_t that has size of ELF_NREG.
2288 *
2289 * typedef <target_regtype> target_elf_greg_t;
2290 * #define ELF_NREG <number of registers>
2291 * typedef taret_elf_greg_t target_elf_gregset_t[ELF_NREG];
2292 *
2293 * Last step is to implement target specific function that copies registers
2294 * from given cpu into just specified register set. Prototype is:
2295 *
2296 * static void elf_core_copy_regs(taret_elf_gregset_t *regs,
2297 * const CPUArchState *env);
2298 *
2299 * Parameters:
2300 * regs - copy register values into here (allocated and zeroed by caller)
2301 * env - copy registers from here
2302 *
2303 * Example for ARM target is provided in this file.
2304 */
2305
2306 /* An ELF note in memory */
2307 struct memelfnote {
2308 const char *name;
2309 size_t namesz;
2310 size_t namesz_rounded;
2311 int type;
2312 size_t datasz;
2313 size_t datasz_rounded;
2314 void *data;
2315 size_t notesz;
2316 };
2317
2318 struct target_elf_siginfo {
2319 abi_int si_signo; /* signal number */
2320 abi_int si_code; /* extra code */
2321 abi_int si_errno; /* errno */
2322 };
2323
2324 struct target_elf_prstatus {
2325 struct target_elf_siginfo pr_info; /* Info associated with signal */
2326 abi_short pr_cursig; /* Current signal */
2327 abi_ulong pr_sigpend; /* XXX */
2328 abi_ulong pr_sighold; /* XXX */
2329 target_pid_t pr_pid;
2330 target_pid_t pr_ppid;
2331 target_pid_t pr_pgrp;
2332 target_pid_t pr_sid;
2333 struct target_timeval pr_utime; /* XXX User time */
2334 struct target_timeval pr_stime; /* XXX System time */
2335 struct target_timeval pr_cutime; /* XXX Cumulative user time */
2336 struct target_timeval pr_cstime; /* XXX Cumulative system time */
2337 target_elf_gregset_t pr_reg; /* GP registers */
2338 abi_int pr_fpvalid; /* XXX */
2339 };
2340
2341 #define ELF_PRARGSZ (80) /* Number of chars for args */
2342
2343 struct target_elf_prpsinfo {
2344 char pr_state; /* numeric process state */
2345 char pr_sname; /* char for pr_state */
2346 char pr_zomb; /* zombie */
2347 char pr_nice; /* nice val */
2348 abi_ulong pr_flag; /* flags */
2349 target_uid_t pr_uid;
2350 target_gid_t pr_gid;
2351 target_pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid;
2352 /* Lots missing */
2353 char pr_fname[16]; /* filename of executable */
2354 char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
2355 };
2356
2357 /* Here is the structure in which status of each thread is captured. */
2358 struct elf_thread_status {
2359 QTAILQ_ENTRY(elf_thread_status) ets_link;
2360 struct target_elf_prstatus prstatus; /* NT_PRSTATUS */
2361 #if 0
2362 elf_fpregset_t fpu; /* NT_PRFPREG */
2363 struct task_struct *thread;
2364 elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */
2365 #endif
2366 struct memelfnote notes[1];
2367 int num_notes;
2368 };
2369
2370 struct elf_note_info {
2371 struct memelfnote *notes;
2372 struct target_elf_prstatus *prstatus; /* NT_PRSTATUS */
2373 struct target_elf_prpsinfo *psinfo; /* NT_PRPSINFO */
2374
2375 QTAILQ_HEAD(thread_list_head, elf_thread_status) thread_list;
2376 #if 0
2377 /*
2378 * Current version of ELF coredump doesn't support
2379 * dumping fp regs etc.
2380 */
2381 elf_fpregset_t *fpu;
2382 elf_fpxregset_t *xfpu;
2383 int thread_status_size;
2384 #endif
2385 int notes_size;
2386 int numnote;
2387 };
2388
2389 struct vm_area_struct {
2390 target_ulong vma_start; /* start vaddr of memory region */
2391 target_ulong vma_end; /* end vaddr of memory region */
2392 abi_ulong vma_flags; /* protection etc. flags for the region */
2393 QTAILQ_ENTRY(vm_area_struct) vma_link;
2394 };
2395
2396 struct mm_struct {
2397 QTAILQ_HEAD(, vm_area_struct) mm_mmap;
2398 int mm_count; /* number of mappings */
2399 };
2400
2401 static struct mm_struct *vma_init(void);
2402 static void vma_delete(struct mm_struct *);
2403 static int vma_add_mapping(struct mm_struct *, target_ulong,
2404 target_ulong, abi_ulong);
2405 static int vma_get_mapping_count(const struct mm_struct *);
2406 static struct vm_area_struct *vma_first(const struct mm_struct *);
2407 static struct vm_area_struct *vma_next(struct vm_area_struct *);
2408 static abi_ulong vma_dump_size(const struct vm_area_struct *);
2409 static int vma_walker(void *priv, target_ulong start, target_ulong end,
2410 unsigned long flags);
2411
2412 static void fill_elf_header(struct elfhdr *, int, uint16_t, uint32_t);
2413 static void fill_note(struct memelfnote *, const char *, int,
2414 unsigned int, void *);
2415 static void fill_prstatus(struct target_elf_prstatus *, const TaskState *, int);
2416 static int fill_psinfo(struct target_elf_prpsinfo *, const TaskState *);
2417 static void fill_auxv_note(struct memelfnote *, const TaskState *);
2418 static void fill_elf_note_phdr(struct elf_phdr *, int, off_t);
2419 static size_t note_size(const struct memelfnote *);
2420 static void free_note_info(struct elf_note_info *);
2421 static int fill_note_info(struct elf_note_info *, long, const CPUArchState *);
2422 static void fill_thread_info(struct elf_note_info *, const CPUArchState *);
2423 static int core_dump_filename(const TaskState *, char *, size_t);
2424
2425 static int dump_write(int, const void *, size_t);
2426 static int write_note(struct memelfnote *, int);
2427 static int write_note_info(struct elf_note_info *, int);
2428
2429 #ifdef BSWAP_NEEDED
2430 static void bswap_prstatus(struct target_elf_prstatus *prstatus)
2431 {
2432 prstatus->pr_info.si_signo = tswap32(prstatus->pr_info.si_signo);
2433 prstatus->pr_info.si_code = tswap32(prstatus->pr_info.si_code);
2434 prstatus->pr_info.si_errno = tswap32(prstatus->pr_info.si_errno);
2435 prstatus->pr_cursig = tswap16(prstatus->pr_cursig);
2436 prstatus->pr_sigpend = tswapal(prstatus->pr_sigpend);
2437 prstatus->pr_sighold = tswapal(prstatus->pr_sighold);
2438 prstatus->pr_pid = tswap32(prstatus->pr_pid);
2439 prstatus->pr_ppid = tswap32(prstatus->pr_ppid);
2440 prstatus->pr_pgrp = tswap32(prstatus->pr_pgrp);
2441 prstatus->pr_sid = tswap32(prstatus->pr_sid);
2442 /* cpu times are not filled, so we skip them */
2443 /* regs should be in correct format already */
2444 prstatus->pr_fpvalid = tswap32(prstatus->pr_fpvalid);
2445 }
2446
2447 static void bswap_psinfo(struct target_elf_prpsinfo *psinfo)
2448 {
2449 psinfo->pr_flag = tswapal(psinfo->pr_flag);
2450 psinfo->pr_uid = tswap16(psinfo->pr_uid);
2451 psinfo->pr_gid = tswap16(psinfo->pr_gid);
2452 psinfo->pr_pid = tswap32(psinfo->pr_pid);
2453 psinfo->pr_ppid = tswap32(psinfo->pr_ppid);
2454 psinfo->pr_pgrp = tswap32(psinfo->pr_pgrp);
2455 psinfo->pr_sid = tswap32(psinfo->pr_sid);
2456 }
2457
2458 static void bswap_note(struct elf_note *en)
2459 {
2460 bswap32s(&en->n_namesz);
2461 bswap32s(&en->n_descsz);
2462 bswap32s(&en->n_type);
2463 }
2464 #else
2465 static inline void bswap_prstatus(struct target_elf_prstatus *p) { }
2466 static inline void bswap_psinfo(struct target_elf_prpsinfo *p) {}
2467 static inline void bswap_note(struct elf_note *en) { }
2468 #endif /* BSWAP_NEEDED */
2469
2470 /*
2471 * Minimal support for linux memory regions. These are needed
2472 * when we are finding out what memory exactly belongs to
2473 * emulated process. No locks needed here, as long as
2474 * thread that received the signal is stopped.
2475 */
2476
2477 static struct mm_struct *vma_init(void)
2478 {
2479 struct mm_struct *mm;
2480
2481 if ((mm = g_malloc(sizeof (*mm))) == NULL)
2482 return (NULL);
2483
2484 mm->mm_count = 0;
2485 QTAILQ_INIT(&mm->mm_mmap);
2486
2487 return (mm);
2488 }
2489
2490 static void vma_delete(struct mm_struct *mm)
2491 {
2492 struct vm_area_struct *vma;
2493
2494 while ((vma = vma_first(mm)) != NULL) {
2495 QTAILQ_REMOVE(&mm->mm_mmap, vma, vma_link);
2496 g_free(vma);
2497 }
2498 g_free(mm);
2499 }
2500
2501 static int vma_add_mapping(struct mm_struct *mm, target_ulong start,
2502 target_ulong end, abi_ulong flags)
2503 {
2504 struct vm_area_struct *vma;
2505
2506 if ((vma = g_malloc0(sizeof (*vma))) == NULL)
2507 return (-1);
2508
2509 vma->vma_start = start;
2510 vma->vma_end = end;
2511 vma->vma_flags = flags;
2512
2513 QTAILQ_INSERT_TAIL(&mm->mm_mmap, vma, vma_link);
2514 mm->mm_count++;
2515
2516 return (0);
2517 }
2518
2519 static struct vm_area_struct *vma_first(const struct mm_struct *mm)
2520 {
2521 return (QTAILQ_FIRST(&mm->mm_mmap));
2522 }
2523
2524 static struct vm_area_struct *vma_next(struct vm_area_struct *vma)
2525 {
2526 return (QTAILQ_NEXT(vma, vma_link));
2527 }
2528
2529 static int vma_get_mapping_count(const struct mm_struct *mm)
2530 {
2531 return (mm->mm_count);
2532 }
2533
2534 /*
2535 * Calculate file (dump) size of given memory region.
2536 */
2537 static abi_ulong vma_dump_size(const struct vm_area_struct *vma)
2538 {
2539 /* if we cannot even read the first page, skip it */
2540 if (!access_ok(VERIFY_READ, vma->vma_start, TARGET_PAGE_SIZE))
2541 return (0);
2542
2543 /*
2544 * Usually we don't dump executable pages as they contain
2545 * non-writable code that debugger can read directly from
2546 * target library etc. However, thread stacks are marked
2547 * also executable so we read in first page of given region
2548 * and check whether it contains elf header. If there is
2549 * no elf header, we dump it.
2550 */
2551 if (vma->vma_flags & PROT_EXEC) {
2552 char page[TARGET_PAGE_SIZE];
2553
2554 copy_from_user(page, vma->vma_start, sizeof (page));
2555 if ((page[EI_MAG0] == ELFMAG0) &&
2556 (page[EI_MAG1] == ELFMAG1) &&
2557 (page[EI_MAG2] == ELFMAG2) &&
2558 (page[EI_MAG3] == ELFMAG3)) {
2559 /*
2560 * Mappings are possibly from ELF binary. Don't dump
2561 * them.
2562 */
2563 return (0);
2564 }
2565 }
2566
2567 return (vma->vma_end - vma->vma_start);
2568 }
2569
2570 static int vma_walker(void *priv, target_ulong start, target_ulong end,
2571 unsigned long flags)
2572 {
2573 struct mm_struct *mm = (struct mm_struct *)priv;
2574
2575 vma_add_mapping(mm, start, end, flags);
2576 return (0);
2577 }
2578
2579 static void fill_note(struct memelfnote *note, const char *name, int type,
2580 unsigned int sz, void *data)
2581 {
2582 unsigned int namesz;
2583
2584 namesz = strlen(name) + 1;
2585 note->name = name;
2586 note->namesz = namesz;
2587 note->namesz_rounded = roundup(namesz, sizeof (int32_t));
2588 note->type = type;
2589 note->datasz = sz;
2590 note->datasz_rounded = roundup(sz, sizeof (int32_t));
2591
2592 note->data = data;
2593
2594 /*
2595 * We calculate rounded up note size here as specified by
2596 * ELF document.
2597 */
2598 note->notesz = sizeof (struct elf_note) +
2599 note->namesz_rounded + note->datasz_rounded;
2600 }
2601
2602 static void fill_elf_header(struct elfhdr *elf, int segs, uint16_t machine,
2603 uint32_t flags)
2604 {
2605 (void) memset(elf, 0, sizeof(*elf));
2606
2607 (void) memcpy(elf->e_ident, ELFMAG, SELFMAG);
2608 elf->e_ident[EI_CLASS] = ELF_CLASS;
2609 elf->e_ident[EI_DATA] = ELF_DATA;
2610 elf->e_ident[EI_VERSION] = EV_CURRENT;
2611 elf->e_ident[EI_OSABI] = ELF_OSABI;
2612
2613 elf->e_type = ET_CORE;
2614 elf->e_machine = machine;
2615 elf->e_version = EV_CURRENT;
2616 elf->e_phoff = sizeof(struct elfhdr);
2617 elf->e_flags = flags;
2618 elf->e_ehsize = sizeof(struct elfhdr);
2619 elf->e_phentsize = sizeof(struct elf_phdr);
2620 elf->e_phnum = segs;
2621
2622 bswap_ehdr(elf);
2623 }
2624
2625 static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, off_t offset)
2626 {
2627 phdr->p_type = PT_NOTE;
2628 phdr->p_offset = offset;
2629 phdr->p_vaddr = 0;
2630 phdr->p_paddr = 0;
2631 phdr->p_filesz = sz;
2632 phdr->p_memsz = 0;
2633 phdr->p_flags = 0;
2634 phdr->p_align = 0;
2635
2636 bswap_phdr(phdr, 1);
2637 }
2638
2639 static size_t note_size(const struct memelfnote *note)
2640 {
2641 return (note->notesz);
2642 }
2643
2644 static void fill_prstatus(struct target_elf_prstatus *prstatus,
2645 const TaskState *ts, int signr)
2646 {
2647 (void) memset(prstatus, 0, sizeof (*prstatus));
2648 prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
2649 prstatus->pr_pid = ts->ts_tid;
2650 prstatus->pr_ppid = getppid();
2651 prstatus->pr_pgrp = getpgrp();
2652 prstatus->pr_sid = getsid(0);
2653
2654 bswap_prstatus(prstatus);
2655 }
2656
2657 static int fill_psinfo(struct target_elf_prpsinfo *psinfo, const TaskState *ts)
2658 {
2659 char *base_filename;
2660 unsigned int i, len;
2661
2662 (void) memset(psinfo, 0, sizeof (*psinfo));
2663
2664 len = ts->info->arg_end - ts->info->arg_start;
2665 if (len >= ELF_PRARGSZ)
2666 len = ELF_PRARGSZ - 1;
2667 if (copy_from_user(&psinfo->pr_psargs, ts->info->arg_start, len))
2668 return -EFAULT;
2669 for (i = 0; i < len; i++)
2670 if (psinfo->pr_psargs[i] == 0)
2671 psinfo->pr_psargs[i] = ' ';
2672 psinfo->pr_psargs[len] = 0;
2673
2674 psinfo->pr_pid = getpid();
2675 psinfo->pr_ppid = getppid();
2676 psinfo->pr_pgrp = getpgrp();
2677 psinfo->pr_sid = getsid(0);
2678 psinfo->pr_uid = getuid();
2679 psinfo->pr_gid = getgid();
2680
2681 base_filename = g_path_get_basename(ts->bprm->filename);
2682 /*
2683 * Using strncpy here is fine: at max-length,
2684 * this field is not NUL-terminated.
2685 */
2686 (void) strncpy(psinfo->pr_fname, base_filename,
2687 sizeof(psinfo->pr_fname));
2688
2689 g_free(base_filename);
2690 bswap_psinfo(psinfo);
2691 return (0);
2692 }
2693
2694 static void fill_auxv_note(struct memelfnote *note, const TaskState *ts)
2695 {
2696 elf_addr_t auxv = (elf_addr_t)ts->info->saved_auxv;
2697 elf_addr_t orig_auxv = auxv;
2698 void *ptr;
2699 int len = ts->info->auxv_len;
2700
2701 /*
2702 * Auxiliary vector is stored in target process stack. It contains
2703 * {type, value} pairs that we need to dump into note. This is not
2704 * strictly necessary but we do it here for sake of completeness.
2705 */
2706
2707 /* read in whole auxv vector and copy it to memelfnote */
2708 ptr = lock_user(VERIFY_READ, orig_auxv, len, 0);
2709 if (ptr != NULL) {
2710 fill_note(note, "CORE", NT_AUXV, len, ptr);
2711 unlock_user(ptr, auxv, len);
2712 }
2713 }
2714
2715 /*
2716 * Constructs name of coredump file. We have following convention
2717 * for the name:
2718 * qemu_<basename-of-target-binary>_<date>-<time>_<pid>.core
2719 *
2720 * Returns 0 in case of success, -1 otherwise (errno is set).
2721 */
2722 static int core_dump_filename(const TaskState *ts, char *buf,
2723 size_t bufsize)
2724 {
2725 char timestamp[64];
2726 char *filename = NULL;
2727 char *base_filename = NULL;
2728 struct timeval tv;
2729 struct tm tm;
2730
2731 assert(bufsize >= PATH_MAX);
2732
2733 if (gettimeofday(&tv, NULL) < 0) {
2734 (void) fprintf(stderr, "unable to get current timestamp: %s",
2735 strerror(errno));
2736 return (-1);
2737 }
2738
2739 filename = strdup(ts->bprm->filename);
2740 base_filename = strdup(basename(filename));
2741 (void) strftime(timestamp, sizeof (timestamp), "%Y%m%d-%H%M%S",
2742 localtime_r(&tv.tv_sec, &tm));
2743 (void) snprintf(buf, bufsize, "qemu_%s_%s_%d.core",
2744 base_filename, timestamp, (int)getpid());
2745 free(base_filename);
2746 free(filename);
2747
2748 return (0);
2749 }
2750
2751 static int dump_write(int fd, const void *ptr, size_t size)
2752 {
2753 const char *bufp = (const char *)ptr;
2754 ssize_t bytes_written, bytes_left;
2755 struct rlimit dumpsize;
2756 off_t pos;
2757
2758 bytes_written = 0;
2759 getrlimit(RLIMIT_CORE, &dumpsize);
2760 if ((pos = lseek(fd, 0, SEEK_CUR))==-1) {
2761 if (errno == ESPIPE) { /* not a seekable stream */
2762 bytes_left = size;
2763 } else {
2764 return pos;
2765 }
2766 } else {
2767 if (dumpsize.rlim_cur <= pos) {
2768 return -1;
2769 } else if (dumpsize.rlim_cur == RLIM_INFINITY) {
2770 bytes_left = size;
2771 } else {
2772 size_t limit_left=dumpsize.rlim_cur - pos;
2773 bytes_left = limit_left >= size ? size : limit_left ;
2774 }
2775 }
2776
2777 /*
2778 * In normal conditions, single write(2) should do but
2779 * in case of socket etc. this mechanism is more portable.
2780 */
2781 do {
2782 bytes_written = write(fd, bufp, bytes_left);
2783 if (bytes_written < 0) {
2784 if (errno == EINTR)
2785 continue;
2786 return (-1);
2787 } else if (bytes_written == 0) { /* eof */
2788 return (-1);
2789 }
2790 bufp += bytes_written;
2791 bytes_left -= bytes_written;
2792 } while (bytes_left > 0);
2793
2794 return (0);
2795 }
2796
2797 static int write_note(struct memelfnote *men, int fd)
2798 {
2799 struct elf_note en;
2800
2801 en.n_namesz = men->namesz;
2802 en.n_type = men->type;
2803 en.n_descsz = men->datasz;
2804
2805 bswap_note(&en);
2806
2807 if (dump_write(fd, &en, sizeof(en)) != 0)
2808 return (-1);
2809 if (dump_write(fd, men->name, men->namesz_rounded) != 0)
2810 return (-1);
2811 if (dump_write(fd, men->data, men->datasz_rounded) != 0)
2812 return (-1);
2813
2814 return (0);
2815 }
2816
2817 static void fill_thread_info(struct elf_note_info *info, const CPUArchState *env)
2818 {
2819 CPUState *cpu = ENV_GET_CPU((CPUArchState *)env);
2820 TaskState *ts = (TaskState *)cpu->opaque;
2821 struct elf_thread_status *ets;
2822
2823 ets = g_malloc0(sizeof (*ets));
2824 ets->num_notes = 1; /* only prstatus is dumped */
2825 fill_prstatus(&ets->prstatus, ts, 0);
2826 elf_core_copy_regs(&ets->prstatus.pr_reg, env);
2827 fill_note(&ets->notes[0], "CORE", NT_PRSTATUS, sizeof (ets->prstatus),
2828 &ets->prstatus);
2829
2830 QTAILQ_INSERT_TAIL(&info->thread_list, ets, ets_link);
2831
2832 info->notes_size += note_size(&ets->notes[0]);
2833 }
2834
2835 static void init_note_info(struct elf_note_info *info)
2836 {
2837 /* Initialize the elf_note_info structure so that it is at
2838 * least safe to call free_note_info() on it. Must be
2839 * called before calling fill_note_info().
2840 */
2841 memset(info, 0, sizeof (*info));
2842 QTAILQ_INIT(&info->thread_list);
2843 }
2844
2845 static int fill_note_info(struct elf_note_info *info,
2846 long signr, const CPUArchState *env)
2847 {
2848 #define NUMNOTES 3
2849 CPUState *cpu = ENV_GET_CPU((CPUArchState *)env);
2850 TaskState *ts = (TaskState *)cpu->opaque;
2851 int i;
2852
2853 info->notes = g_malloc0(NUMNOTES * sizeof (struct memelfnote));
2854 if (info->notes == NULL)
2855 return (-ENOMEM);
2856 info->prstatus = g_malloc0(sizeof (*info->prstatus));
2857 if (info->prstatus == NULL)
2858 return (-ENOMEM);
2859 info->psinfo = g_malloc0(sizeof (*info->psinfo));
2860 if (info->prstatus == NULL)
2861 return (-ENOMEM);
2862
2863 /*
2864 * First fill in status (and registers) of current thread
2865 * including process info & aux vector.
2866 */
2867 fill_prstatus(info->prstatus, ts, signr);
2868 elf_core_copy_regs(&info->prstatus->pr_reg, env);
2869 fill_note(&info->notes[0], "CORE", NT_PRSTATUS,
2870 sizeof (*info->prstatus), info->prstatus);
2871 fill_psinfo(info->psinfo, ts);
2872 fill_note(&info->notes[1], "CORE", NT_PRPSINFO,
2873 sizeof (*info->psinfo), info->psinfo);
2874 fill_auxv_note(&info->notes[2], ts);
2875 info->numnote = 3;
2876
2877 info->notes_size = 0;
2878 for (i = 0; i < info->numnote; i++)
2879 info->notes_size += note_size(&info->notes[i]);
2880
2881 /* read and fill status of all threads */
2882 cpu_list_lock();
2883 CPU_FOREACH(cpu) {
2884 if (cpu == thread_cpu) {
2885 continue;
2886 }
2887 fill_thread_info(info, (CPUArchState *)cpu->env_ptr);
2888 }
2889 cpu_list_unlock();
2890
2891 return (0);
2892 }
2893
2894 static void free_note_info(struct elf_note_info *info)
2895 {
2896 struct elf_thread_status *ets;
2897
2898 while (!QTAILQ_EMPTY(&info->thread_list)) {
2899 ets = QTAILQ_FIRST(&info->thread_list);
2900 QTAILQ_REMOVE(&info->thread_list, ets, ets_link);
2901 g_free(ets);
2902 }
2903
2904 g_free(info->prstatus);
2905 g_free(info->psinfo);
2906 g_free(info->notes);
2907 }
2908
2909 static int write_note_info(struct elf_note_info *info, int fd)
2910 {
2911 struct elf_thread_status *ets;
2912 int i, error = 0;
2913
2914 /* write prstatus, psinfo and auxv for current thread */
2915 for (i = 0; i < info->numnote; i++)
2916 if ((error = write_note(&info->notes[i], fd)) != 0)
2917 return (error);
2918
2919 /* write prstatus for each thread */
2920 QTAILQ_FOREACH(ets, &info->thread_list, ets_link) {
2921 if ((error = write_note(&ets->notes[0], fd)) != 0)
2922 return (error);
2923 }
2924
2925 return (0);
2926 }
2927
2928 /*
2929 * Write out ELF coredump.
2930 *
2931 * See documentation of ELF object file format in:
2932 * http://www.caldera.com/developers/devspecs/gabi41.pdf
2933 *
2934 * Coredump format in linux is following:
2935 *
2936 * 0 +----------------------+ \
2937 * | ELF header | ET_CORE |
2938 * +----------------------+ |
2939 * | ELF program headers | |--- headers
2940 * | - NOTE section | |
2941 * | - PT_LOAD sections | |
2942 * +----------------------+ /
2943 * | NOTEs: |
2944 * | - NT_PRSTATUS |
2945 * | - NT_PRSINFO |
2946 * | - NT_AUXV |
2947 * +----------------------+ <-- aligned to target page
2948 * | Process memory dump |
2949 * : :
2950 * . .
2951 * : :
2952 * | |
2953 * +----------------------+
2954 *
2955 * NT_PRSTATUS -> struct elf_prstatus (per thread)
2956 * NT_PRSINFO -> struct elf_prpsinfo
2957 * NT_AUXV is array of { type, value } pairs (see fill_auxv_note()).
2958 *
2959 * Format follows System V format as close as possible. Current
2960 * version limitations are as follows:
2961 * - no floating point registers are dumped
2962 *
2963 * Function returns 0 in case of success, negative errno otherwise.
2964 *
2965 * TODO: make this work also during runtime: it should be
2966 * possible to force coredump from running process and then
2967 * continue processing. For example qemu could set up SIGUSR2
2968 * handler (provided that target process haven't registered
2969 * handler for that) that does the dump when signal is received.
2970 */
2971 static int elf_core_dump(int signr, const CPUArchState *env)
2972 {
2973 const CPUState *cpu = ENV_GET_CPU((CPUArchState *)env);
2974 const TaskState *ts = (const TaskState *)cpu->opaque;
2975 struct vm_area_struct *vma = NULL;
2976 char corefile[PATH_MAX];
2977 struct elf_note_info info;
2978 struct elfhdr elf;
2979 struct elf_phdr phdr;
2980 struct rlimit dumpsize;
2981 struct mm_struct *mm = NULL;
2982 off_t offset = 0, data_offset = 0;
2983 int segs = 0;
2984 int fd = -1;
2985
2986 init_note_info(&info);
2987
2988 errno = 0;
2989 getrlimit(RLIMIT_CORE, &dumpsize);
2990 if (dumpsize.rlim_cur == 0)
2991 return 0;
2992
2993 if (core_dump_filename(ts, corefile, sizeof (corefile)) < 0)
2994 return (-errno);
2995
2996 if ((fd = open(corefile, O_WRONLY | O_CREAT,
2997 S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)) < 0)
2998 return (-errno);
2999
3000 /*
3001 * Walk through target process memory mappings and
3002 * set up structure containing this information. After
3003 * this point vma_xxx functions can be used.
3004 */
3005 if ((mm = vma_init()) == NULL)
3006 goto out;
3007
3008 walk_memory_regions(mm, vma_walker);
3009 segs = vma_get_mapping_count(mm);
3010
3011 /*
3012 * Construct valid coredump ELF header. We also
3013 * add one more segment for notes.
3014 */
3015 fill_elf_header(&elf, segs + 1, ELF_MACHINE, 0);
3016 if (dump_write(fd, &elf, sizeof (elf)) != 0)
3017 goto out;
3018
3019 /* fill in in-memory version of notes */
3020 if (fill_note_info(&info, signr, env) < 0)
3021 goto out;
3022
3023 offset += sizeof (elf); /* elf header */
3024 offset += (segs + 1) * sizeof (struct elf_phdr); /* program headers */
3025
3026 /* write out notes program header */
3027 fill_elf_note_phdr(&phdr, info.notes_size, offset);
3028
3029 offset += info.notes_size;
3030 if (dump_write(fd, &phdr, sizeof (phdr)) != 0)
3031 goto out;
3032
3033 /*
3034 * ELF specification wants data to start at page boundary so
3035 * we align it here.
3036 */
3037 data_offset = offset = roundup(offset, ELF_EXEC_PAGESIZE);
3038
3039 /*
3040 * Write program headers for memory regions mapped in
3041 * the target process.
3042 */
3043 for (vma = vma_first(mm); vma != NULL; vma = vma_next(vma)) {
3044 (void) memset(&phdr, 0, sizeof (phdr));
3045
3046 phdr.p_type = PT_LOAD;
3047 phdr.p_offset = offset;
3048 phdr.p_vaddr = vma->vma_start;
3049 phdr.p_paddr = 0;
3050 phdr.p_filesz = vma_dump_size(vma);
3051 offset += phdr.p_filesz;
3052 phdr.p_memsz = vma->vma_end - vma->vma_start;
3053 phdr.p_flags = vma->vma_flags & PROT_READ ? PF_R : 0;
3054 if (vma->vma_flags & PROT_WRITE)
3055 phdr.p_flags |= PF_W;
3056 if (vma->vma_flags & PROT_EXEC)
3057 phdr.p_flags |= PF_X;
3058 phdr.p_align = ELF_EXEC_PAGESIZE;
3059
3060 bswap_phdr(&phdr, 1);
3061 dump_write(fd, &phdr, sizeof (phdr));
3062 }
3063
3064 /*
3065 * Next we write notes just after program headers. No
3066 * alignment needed here.
3067 */
3068 if (write_note_info(&info, fd) < 0)
3069 goto out;
3070
3071 /* align data to page boundary */
3072 if (lseek(fd, data_offset, SEEK_SET) != data_offset)
3073 goto out;
3074
3075 /*
3076 * Finally we can dump process memory into corefile as well.
3077 */
3078 for (vma = vma_first(mm); vma != NULL; vma = vma_next(vma)) {
3079 abi_ulong addr;
3080 abi_ulong end;
3081
3082 end = vma->vma_start + vma_dump_size(vma);
3083
3084 for (addr = vma->vma_start; addr < end;
3085 addr += TARGET_PAGE_SIZE) {
3086 char page[TARGET_PAGE_SIZE];
3087 int error;
3088
3089 /*
3090 * Read in page from target process memory and
3091 * write it to coredump file.
3092 */
3093 error = copy_from_user(page, addr, sizeof (page));
3094 if (error != 0) {
3095 (void) fprintf(stderr, "unable to dump " TARGET_ABI_FMT_lx "\n",
3096 addr);
3097 errno = -error;
3098 goto out;
3099 }
3100 if (dump_write(fd, page, TARGET_PAGE_SIZE) < 0)
3101 goto out;
3102 }
3103 }
3104
3105 out:
3106 free_note_info(&info);
3107 if (mm != NULL)
3108 vma_delete(mm);
3109 (void) close(fd);
3110
3111 if (errno != 0)
3112 return (-errno);
3113 return (0);
3114 }
3115 #endif /* USE_ELF_CORE_DUMP */
3116
3117 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop)
3118 {
3119 init_thread(regs, infop);
3120 }
AR7 emulation for QEMU