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target/xtensa: add linux-user support
[qemu.git] / linux-user / elfload.c
blobfe7a5bc5663bbd326f58260730d9c25591d48691
1 /* This is the Linux kernel elf-loading code, ported into user space */
2 #include "qemu/osdep.h"
3 #include <sys/param.h>
4
5 #include <sys/resource.h>
6
7 #include "qemu.h"
8 #include "disas/disas.h"
9 #include "qemu/path.h"
10
11 #ifdef _ARCH_PPC64
12 #undef ARCH_DLINFO
13 #undef ELF_PLATFORM
14 #undef ELF_HWCAP
15 #undef ELF_HWCAP2
16 #undef ELF_CLASS
17 #undef ELF_DATA
18 #undef ELF_ARCH
19 #endif
20
21 #define ELF_OSABI ELFOSABI_SYSV
22
23 /* from personality.h */
24
25 /*
26 * Flags for bug emulation.
27 *
28 * These occupy the top three bytes.
29 */
30 enum {
31 ADDR_NO_RANDOMIZE = 0x0040000, /* disable randomization of VA space */
32 FDPIC_FUNCPTRS = 0x0080000, /* userspace function ptrs point to
33 descriptors (signal handling) */
34 MMAP_PAGE_ZERO = 0x0100000,
35 ADDR_COMPAT_LAYOUT = 0x0200000,
36 READ_IMPLIES_EXEC = 0x0400000,
37 ADDR_LIMIT_32BIT = 0x0800000,
38 SHORT_INODE = 0x1000000,
39 WHOLE_SECONDS = 0x2000000,
40 STICKY_TIMEOUTS = 0x4000000,
41 ADDR_LIMIT_3GB = 0x8000000,
42 };
43
44 /*
45 * Personality types.
46 *
47 * These go in the low byte. Avoid using the top bit, it will
48 * conflict with error returns.
49 */
50 enum {
51 PER_LINUX = 0x0000,
52 PER_LINUX_32BIT = 0x0000 | ADDR_LIMIT_32BIT,
53 PER_LINUX_FDPIC = 0x0000 | FDPIC_FUNCPTRS,
54 PER_SVR4 = 0x0001 | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
55 PER_SVR3 = 0x0002 | STICKY_TIMEOUTS | SHORT_INODE,
56 PER_SCOSVR3 = 0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS | SHORT_INODE,
57 PER_OSR5 = 0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS,
58 PER_WYSEV386 = 0x0004 | STICKY_TIMEOUTS | SHORT_INODE,
59 PER_ISCR4 = 0x0005 | STICKY_TIMEOUTS,
60 PER_BSD = 0x0006,
61 PER_SUNOS = 0x0006 | STICKY_TIMEOUTS,
62 PER_XENIX = 0x0007 | STICKY_TIMEOUTS | SHORT_INODE,
63 PER_LINUX32 = 0x0008,
64 PER_LINUX32_3GB = 0x0008 | ADDR_LIMIT_3GB,
65 PER_IRIX32 = 0x0009 | STICKY_TIMEOUTS,/* IRIX5 32-bit */
66 PER_IRIXN32 = 0x000a | STICKY_TIMEOUTS,/* IRIX6 new 32-bit */
67 PER_IRIX64 = 0x000b | STICKY_TIMEOUTS,/* IRIX6 64-bit */
68 PER_RISCOS = 0x000c,
69 PER_SOLARIS = 0x000d | STICKY_TIMEOUTS,
70 PER_UW7 = 0x000e | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
71 PER_OSF4 = 0x000f, /* OSF/1 v4 */
72 PER_HPUX = 0x0010,
73 PER_MASK = 0x00ff,
74 };
75
76 /*
77 * Return the base personality without flags.
78 */
79 #define personality(pers) (pers & PER_MASK)
80
81 /* this flag is uneffective under linux too, should be deleted */
82 #ifndef MAP_DENYWRITE
83 #define MAP_DENYWRITE 0
84 #endif
85
86 /* should probably go in elf.h */
87 #ifndef ELIBBAD
88 #define ELIBBAD 80
89 #endif
90
91 #ifdef TARGET_WORDS_BIGENDIAN
92 #define ELF_DATA ELFDATA2MSB
93 #else
94 #define ELF_DATA ELFDATA2LSB
95 #endif
96
97 #ifdef TARGET_ABI_MIPSN32
98 typedef abi_ullong target_elf_greg_t;
99 #define tswapreg(ptr) tswap64(ptr)
100 #else
101 typedef abi_ulong target_elf_greg_t;
102 #define tswapreg(ptr) tswapal(ptr)
103 #endif
104
105 #ifdef USE_UID16
106 typedef abi_ushort target_uid_t;
107 typedef abi_ushort target_gid_t;
108 #else
109 typedef abi_uint target_uid_t;
110 typedef abi_uint target_gid_t;
111 #endif
112 typedef abi_int target_pid_t;
113
114 #ifdef TARGET_I386
115
116 #define ELF_PLATFORM get_elf_platform()
117
118 static const char *get_elf_platform(void)
119 {
120 static char elf_platform[] = "i386";
121 int family = object_property_get_int(OBJECT(thread_cpu), "family", NULL);
122 if (family > 6)
123 family = 6;
124 if (family >= 3)
125 elf_platform[1] = '0' + family;
126 return elf_platform;
127 }
128
129 #define ELF_HWCAP get_elf_hwcap()
130
131 static uint32_t get_elf_hwcap(void)
132 {
133 X86CPU *cpu = X86_CPU(thread_cpu);
134
135 return cpu->env.features[FEAT_1_EDX];
136 }
137
138 #ifdef TARGET_X86_64
139 #define ELF_START_MMAP 0x2aaaaab000ULL
140
141 #define ELF_CLASS ELFCLASS64
142 #define ELF_ARCH EM_X86_64
143
144 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
145 {
146 regs->rax = 0;
147 regs->rsp = infop->start_stack;
148 regs->rip = infop->entry;
149 }
150
151 #define ELF_NREG 27
152 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
153
154 /*
155 * Note that ELF_NREG should be 29 as there should be place for
156 * TRAPNO and ERR "registers" as well but linux doesn't dump
157 * those.
158 *
159 * See linux kernel: arch/x86/include/asm/elf.h
160 */
161 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUX86State *env)
162 {
163 (*regs)[0] = env->regs[15];
164 (*regs)[1] = env->regs[14];
165 (*regs)[2] = env->regs[13];
166 (*regs)[3] = env->regs[12];
167 (*regs)[4] = env->regs[R_EBP];
168 (*regs)[5] = env->regs[R_EBX];
169 (*regs)[6] = env->regs[11];
170 (*regs)[7] = env->regs[10];
171 (*regs)[8] = env->regs[9];
172 (*regs)[9] = env->regs[8];
173 (*regs)[10] = env->regs[R_EAX];
174 (*regs)[11] = env->regs[R_ECX];
175 (*regs)[12] = env->regs[R_EDX];
176 (*regs)[13] = env->regs[R_ESI];
177 (*regs)[14] = env->regs[R_EDI];
178 (*regs)[15] = env->regs[R_EAX]; /* XXX */
179 (*regs)[16] = env->eip;
180 (*regs)[17] = env->segs[R_CS].selector & 0xffff;
181 (*regs)[18] = env->eflags;
182 (*regs)[19] = env->regs[R_ESP];
183 (*regs)[20] = env->segs[R_SS].selector & 0xffff;
184 (*regs)[21] = env->segs[R_FS].selector & 0xffff;
185 (*regs)[22] = env->segs[R_GS].selector & 0xffff;
186 (*regs)[23] = env->segs[R_DS].selector & 0xffff;
187 (*regs)[24] = env->segs[R_ES].selector & 0xffff;
188 (*regs)[25] = env->segs[R_FS].selector & 0xffff;
189 (*regs)[26] = env->segs[R_GS].selector & 0xffff;
190 }
191
192 #else
193
194 #define ELF_START_MMAP 0x80000000
195
196 /*
197 * This is used to ensure we don't load something for the wrong architecture.
198 */
199 #define elf_check_arch(x) ( ((x) == EM_386) || ((x) == EM_486) )
200
201 /*
202 * These are used to set parameters in the core dumps.
203 */
204 #define ELF_CLASS ELFCLASS32
205 #define ELF_ARCH EM_386
206
207 static inline void init_thread(struct target_pt_regs *regs,
208 struct image_info *infop)
209 {
210 regs->esp = infop->start_stack;
211 regs->eip = infop->entry;
212
213 /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program
214 starts %edx contains a pointer to a function which might be
215 registered using `atexit'. This provides a mean for the
216 dynamic linker to call DT_FINI functions for shared libraries
217 that have been loaded before the code runs.
218
219 A value of 0 tells we have no such handler. */
220 regs->edx = 0;
221 }
222
223 #define ELF_NREG 17
224 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
225
226 /*
227 * Note that ELF_NREG should be 19 as there should be place for
228 * TRAPNO and ERR "registers" as well but linux doesn't dump
229 * those.
230 *
231 * See linux kernel: arch/x86/include/asm/elf.h
232 */
233 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUX86State *env)
234 {
235 (*regs)[0] = env->regs[R_EBX];
236 (*regs)[1] = env->regs[R_ECX];
237 (*regs)[2] = env->regs[R_EDX];
238 (*regs)[3] = env->regs[R_ESI];
239 (*regs)[4] = env->regs[R_EDI];
240 (*regs)[5] = env->regs[R_EBP];
241 (*regs)[6] = env->regs[R_EAX];
242 (*regs)[7] = env->segs[R_DS].selector & 0xffff;
243 (*regs)[8] = env->segs[R_ES].selector & 0xffff;
244 (*regs)[9] = env->segs[R_FS].selector & 0xffff;
245 (*regs)[10] = env->segs[R_GS].selector & 0xffff;
246 (*regs)[11] = env->regs[R_EAX]; /* XXX */
247 (*regs)[12] = env->eip;
248 (*regs)[13] = env->segs[R_CS].selector & 0xffff;
249 (*regs)[14] = env->eflags;
250 (*regs)[15] = env->regs[R_ESP];
251 (*regs)[16] = env->segs[R_SS].selector & 0xffff;
252 }
253 #endif
254
255 #define USE_ELF_CORE_DUMP
256 #define ELF_EXEC_PAGESIZE 4096
257
258 #endif
259
260 #ifdef TARGET_ARM
261
262 #ifndef TARGET_AARCH64
263 /* 32 bit ARM definitions */
264
265 #define ELF_START_MMAP 0x80000000
266
267 #define ELF_ARCH EM_ARM
268 #define ELF_CLASS ELFCLASS32
269
270 static inline void init_thread(struct target_pt_regs *regs,
271 struct image_info *infop)
272 {
273 abi_long stack = infop->start_stack;
274 memset(regs, 0, sizeof(*regs));
275
276 regs->uregs[16] = ARM_CPU_MODE_USR;
277 if (infop->entry & 1) {
278 regs->uregs[16] |= CPSR_T;
279 }
280 regs->uregs[15] = infop->entry & 0xfffffffe;
281 regs->uregs[13] = infop->start_stack;
282 /* FIXME - what to for failure of get_user()? */
283 get_user_ual(regs->uregs[2], stack + 8); /* envp */
284 get_user_ual(regs->uregs[1], stack + 4); /* envp */
285 /* XXX: it seems that r0 is zeroed after ! */
286 regs->uregs[0] = 0;
287 /* For uClinux PIC binaries. */
288 /* XXX: Linux does this only on ARM with no MMU (do we care ?) */
289 regs->uregs[10] = infop->start_data;
290 }
291
292 #define ELF_NREG 18
293 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
294
295 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUARMState *env)
296 {
297 (*regs)[0] = tswapreg(env->regs[0]);
298 (*regs)[1] = tswapreg(env->regs[1]);
299 (*regs)[2] = tswapreg(env->regs[2]);
300 (*regs)[3] = tswapreg(env->regs[3]);
301 (*regs)[4] = tswapreg(env->regs[4]);
302 (*regs)[5] = tswapreg(env->regs[5]);
303 (*regs)[6] = tswapreg(env->regs[6]);
304 (*regs)[7] = tswapreg(env->regs[7]);
305 (*regs)[8] = tswapreg(env->regs[8]);
306 (*regs)[9] = tswapreg(env->regs[9]);
307 (*regs)[10] = tswapreg(env->regs[10]);
308 (*regs)[11] = tswapreg(env->regs[11]);
309 (*regs)[12] = tswapreg(env->regs[12]);
310 (*regs)[13] = tswapreg(env->regs[13]);
311 (*regs)[14] = tswapreg(env->regs[14]);
312 (*regs)[15] = tswapreg(env->regs[15]);
313
314 (*regs)[16] = tswapreg(cpsr_read((CPUARMState *)env));
315 (*regs)[17] = tswapreg(env->regs[0]); /* XXX */
316 }
317
318 #define USE_ELF_CORE_DUMP
319 #define ELF_EXEC_PAGESIZE 4096
320
321 enum
322 {
323 ARM_HWCAP_ARM_SWP = 1 << 0,
324 ARM_HWCAP_ARM_HALF = 1 << 1,
325 ARM_HWCAP_ARM_THUMB = 1 << 2,
326 ARM_HWCAP_ARM_26BIT = 1 << 3,
327 ARM_HWCAP_ARM_FAST_MULT = 1 << 4,
328 ARM_HWCAP_ARM_FPA = 1 << 5,
329 ARM_HWCAP_ARM_VFP = 1 << 6,
330 ARM_HWCAP_ARM_EDSP = 1 << 7,
331 ARM_HWCAP_ARM_JAVA = 1 << 8,
332 ARM_HWCAP_ARM_IWMMXT = 1 << 9,
333 ARM_HWCAP_ARM_CRUNCH = 1 << 10,
334 ARM_HWCAP_ARM_THUMBEE = 1 << 11,
335 ARM_HWCAP_ARM_NEON = 1 << 12,
336 ARM_HWCAP_ARM_VFPv3 = 1 << 13,
337 ARM_HWCAP_ARM_VFPv3D16 = 1 << 14,
338 ARM_HWCAP_ARM_TLS = 1 << 15,
339 ARM_HWCAP_ARM_VFPv4 = 1 << 16,
340 ARM_HWCAP_ARM_IDIVA = 1 << 17,
341 ARM_HWCAP_ARM_IDIVT = 1 << 18,
342 ARM_HWCAP_ARM_VFPD32 = 1 << 19,
343 ARM_HWCAP_ARM_LPAE = 1 << 20,
344 ARM_HWCAP_ARM_EVTSTRM = 1 << 21,
345 };
346
347 enum {
348 ARM_HWCAP2_ARM_AES = 1 << 0,
349 ARM_HWCAP2_ARM_PMULL = 1 << 1,
350 ARM_HWCAP2_ARM_SHA1 = 1 << 2,
351 ARM_HWCAP2_ARM_SHA2 = 1 << 3,
352 ARM_HWCAP2_ARM_CRC32 = 1 << 4,
353 };
354
355 /* The commpage only exists for 32 bit kernels */
356
357 #define TARGET_HAS_VALIDATE_GUEST_SPACE
358 /* Return 1 if the proposed guest space is suitable for the guest.
359 * Return 0 if the proposed guest space isn't suitable, but another
360 * address space should be tried.
361 * Return -1 if there is no way the proposed guest space can be
362 * valid regardless of the base.
363 * The guest code may leave a page mapped and populate it if the
364 * address is suitable.
365 */
366 static int validate_guest_space(unsigned long guest_base,
367 unsigned long guest_size)
368 {
369 unsigned long real_start, test_page_addr;
370
371 /* We need to check that we can force a fault on access to the
372 * commpage at 0xffff0fxx
373 */
374 test_page_addr = guest_base + (0xffff0f00 & qemu_host_page_mask);
375
376 /* If the commpage lies within the already allocated guest space,
377 * then there is no way we can allocate it.
378 */
379 if (test_page_addr >= guest_base
380 && test_page_addr < (guest_base + guest_size)) {
381 return -1;
382 }
383
384 /* Note it needs to be writeable to let us initialise it */
385 real_start = (unsigned long)
386 mmap((void *)test_page_addr, qemu_host_page_size,
387 PROT_READ | PROT_WRITE,
388 MAP_ANONYMOUS | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
389
390 /* If we can't map it then try another address */
391 if (real_start == -1ul) {
392 return 0;
393 }
394
395 if (real_start != test_page_addr) {
396 /* OS didn't put the page where we asked - unmap and reject */
397 munmap((void *)real_start, qemu_host_page_size);
398 return 0;
399 }
400
401 /* Leave the page mapped
402 * Populate it (mmap should have left it all 0'd)
403 */
404
405 /* Kernel helper versions */
406 __put_user(5, (uint32_t *)g2h(0xffff0ffcul));
407
408 /* Now it's populated make it RO */
409 if (mprotect((void *)test_page_addr, qemu_host_page_size, PROT_READ)) {
410 perror("Protecting guest commpage");
411 exit(-1);
412 }
413
414 return 1; /* All good */
415 }
416
417 #define ELF_HWCAP get_elf_hwcap()
418 #define ELF_HWCAP2 get_elf_hwcap2()
419
420 static uint32_t get_elf_hwcap(void)
421 {
422 ARMCPU *cpu = ARM_CPU(thread_cpu);
423 uint32_t hwcaps = 0;
424
425 hwcaps |= ARM_HWCAP_ARM_SWP;
426 hwcaps |= ARM_HWCAP_ARM_HALF;
427 hwcaps |= ARM_HWCAP_ARM_THUMB;
428 hwcaps |= ARM_HWCAP_ARM_FAST_MULT;
429
430 /* probe for the extra features */
431 #define GET_FEATURE(feat, hwcap) \
432 do { if (arm_feature(&cpu->env, feat)) { hwcaps |= hwcap; } } while (0)
433 /* EDSP is in v5TE and above, but all our v5 CPUs are v5TE */
434 GET_FEATURE(ARM_FEATURE_V5, ARM_HWCAP_ARM_EDSP);
435 GET_FEATURE(ARM_FEATURE_VFP, ARM_HWCAP_ARM_VFP);
436 GET_FEATURE(ARM_FEATURE_IWMMXT, ARM_HWCAP_ARM_IWMMXT);
437 GET_FEATURE(ARM_FEATURE_THUMB2EE, ARM_HWCAP_ARM_THUMBEE);
438 GET_FEATURE(ARM_FEATURE_NEON, ARM_HWCAP_ARM_NEON);
439 GET_FEATURE(ARM_FEATURE_VFP3, ARM_HWCAP_ARM_VFPv3);
440 GET_FEATURE(ARM_FEATURE_V6K, ARM_HWCAP_ARM_TLS);
441 GET_FEATURE(ARM_FEATURE_VFP4, ARM_HWCAP_ARM_VFPv4);
442 GET_FEATURE(ARM_FEATURE_ARM_DIV, ARM_HWCAP_ARM_IDIVA);
443 GET_FEATURE(ARM_FEATURE_THUMB_DIV, ARM_HWCAP_ARM_IDIVT);
444 /* All QEMU's VFPv3 CPUs have 32 registers, see VFP_DREG in translate.c.
445 * Note that the ARM_HWCAP_ARM_VFPv3D16 bit is always the inverse of
446 * ARM_HWCAP_ARM_VFPD32 (and so always clear for QEMU); it is unrelated
447 * to our VFP_FP16 feature bit.
448 */
449 GET_FEATURE(ARM_FEATURE_VFP3, ARM_HWCAP_ARM_VFPD32);
450 GET_FEATURE(ARM_FEATURE_LPAE, ARM_HWCAP_ARM_LPAE);
451
452 return hwcaps;
453 }
454
455 static uint32_t get_elf_hwcap2(void)
456 {
457 ARMCPU *cpu = ARM_CPU(thread_cpu);
458 uint32_t hwcaps = 0;
459
460 GET_FEATURE(ARM_FEATURE_V8_AES, ARM_HWCAP2_ARM_AES);
461 GET_FEATURE(ARM_FEATURE_V8_PMULL, ARM_HWCAP2_ARM_PMULL);
462 GET_FEATURE(ARM_FEATURE_V8_SHA1, ARM_HWCAP2_ARM_SHA1);
463 GET_FEATURE(ARM_FEATURE_V8_SHA256, ARM_HWCAP2_ARM_SHA2);
464 GET_FEATURE(ARM_FEATURE_CRC, ARM_HWCAP2_ARM_CRC32);
465 return hwcaps;
466 }
467
468 #undef GET_FEATURE
469
470 #else
471 /* 64 bit ARM definitions */
472 #define ELF_START_MMAP 0x80000000
473
474 #define ELF_ARCH EM_AARCH64
475 #define ELF_CLASS ELFCLASS64
476 #define ELF_PLATFORM "aarch64"
477
478 static inline void init_thread(struct target_pt_regs *regs,
479 struct image_info *infop)
480 {
481 abi_long stack = infop->start_stack;
482 memset(regs, 0, sizeof(*regs));
483
484 regs->pc = infop->entry & ~0x3ULL;
485 regs->sp = stack;
486 }
487
488 #define ELF_NREG 34
489 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
490
491 static void elf_core_copy_regs(target_elf_gregset_t *regs,
492 const CPUARMState *env)
493 {
494 int i;
495
496 for (i = 0; i < 32; i++) {
497 (*regs)[i] = tswapreg(env->xregs[i]);
498 }
499 (*regs)[32] = tswapreg(env->pc);
500 (*regs)[33] = tswapreg(pstate_read((CPUARMState *)env));
501 }
502
503 #define USE_ELF_CORE_DUMP
504 #define ELF_EXEC_PAGESIZE 4096
505
506 enum {
507 ARM_HWCAP_A64_FP = 1 << 0,
508 ARM_HWCAP_A64_ASIMD = 1 << 1,
509 ARM_HWCAP_A64_EVTSTRM = 1 << 2,
510 ARM_HWCAP_A64_AES = 1 << 3,
511 ARM_HWCAP_A64_PMULL = 1 << 4,
512 ARM_HWCAP_A64_SHA1 = 1 << 5,
513 ARM_HWCAP_A64_SHA2 = 1 << 6,
514 ARM_HWCAP_A64_CRC32 = 1 << 7,
515 ARM_HWCAP_A64_ATOMICS = 1 << 8,
516 ARM_HWCAP_A64_FPHP = 1 << 9,
517 ARM_HWCAP_A64_ASIMDHP = 1 << 10,
518 ARM_HWCAP_A64_CPUID = 1 << 11,
519 ARM_HWCAP_A64_ASIMDRDM = 1 << 12,
520 ARM_HWCAP_A64_JSCVT = 1 << 13,
521 ARM_HWCAP_A64_FCMA = 1 << 14,
522 ARM_HWCAP_A64_LRCPC = 1 << 15,
523 ARM_HWCAP_A64_DCPOP = 1 << 16,
524 ARM_HWCAP_A64_SHA3 = 1 << 17,
525 ARM_HWCAP_A64_SM3 = 1 << 18,
526 ARM_HWCAP_A64_SM4 = 1 << 19,
527 ARM_HWCAP_A64_ASIMDDP = 1 << 20,
528 ARM_HWCAP_A64_SHA512 = 1 << 21,
529 ARM_HWCAP_A64_SVE = 1 << 22,
530 };
531
532 #define ELF_HWCAP get_elf_hwcap()
533
534 static uint32_t get_elf_hwcap(void)
535 {
536 ARMCPU *cpu = ARM_CPU(thread_cpu);
537 uint32_t hwcaps = 0;
538
539 hwcaps |= ARM_HWCAP_A64_FP;
540 hwcaps |= ARM_HWCAP_A64_ASIMD;
541
542 /* probe for the extra features */
543 #define GET_FEATURE(feat, hwcap) \
544 do { if (arm_feature(&cpu->env, feat)) { hwcaps |= hwcap; } } while (0)
545 GET_FEATURE(ARM_FEATURE_V8_AES, ARM_HWCAP_A64_AES);
546 GET_FEATURE(ARM_FEATURE_V8_PMULL, ARM_HWCAP_A64_PMULL);
547 GET_FEATURE(ARM_FEATURE_V8_SHA1, ARM_HWCAP_A64_SHA1);
548 GET_FEATURE(ARM_FEATURE_V8_SHA256, ARM_HWCAP_A64_SHA2);
549 GET_FEATURE(ARM_FEATURE_CRC, ARM_HWCAP_A64_CRC32);
550 GET_FEATURE(ARM_FEATURE_V8_SHA3, ARM_HWCAP_A64_SHA3);
551 GET_FEATURE(ARM_FEATURE_V8_SM3, ARM_HWCAP_A64_SM3);
552 GET_FEATURE(ARM_FEATURE_V8_SM4, ARM_HWCAP_A64_SM4);
553 GET_FEATURE(ARM_FEATURE_V8_SHA512, ARM_HWCAP_A64_SHA512);
554 GET_FEATURE(ARM_FEATURE_V8_FP16,
555 ARM_HWCAP_A64_FPHP | ARM_HWCAP_A64_ASIMDHP);
556 GET_FEATURE(ARM_FEATURE_V8_RDM, ARM_HWCAP_A64_ASIMDRDM);
557 GET_FEATURE(ARM_FEATURE_V8_FCMA, ARM_HWCAP_A64_FCMA);
558 #undef GET_FEATURE
559
560 return hwcaps;
561 }
562
563 #endif /* not TARGET_AARCH64 */
564 #endif /* TARGET_ARM */
565
566 #ifdef TARGET_UNICORE32
567
568 #define ELF_START_MMAP 0x80000000
569
570 #define ELF_CLASS ELFCLASS32
571 #define ELF_DATA ELFDATA2LSB
572 #define ELF_ARCH EM_UNICORE32
573
574 static inline void init_thread(struct target_pt_regs *regs,
575 struct image_info *infop)
576 {
577 abi_long stack = infop->start_stack;
578 memset(regs, 0, sizeof(*regs));
579 regs->UC32_REG_asr = 0x10;
580 regs->UC32_REG_pc = infop->entry & 0xfffffffe;
581 regs->UC32_REG_sp = infop->start_stack;
582 /* FIXME - what to for failure of get_user()? */
583 get_user_ual(regs->UC32_REG_02, stack + 8); /* envp */
584 get_user_ual(regs->UC32_REG_01, stack + 4); /* envp */
585 /* XXX: it seems that r0 is zeroed after ! */
586 regs->UC32_REG_00 = 0;
587 }
588
589 #define ELF_NREG 34
590 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
591
592 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUUniCore32State *env)
593 {
594 (*regs)[0] = env->regs[0];
595 (*regs)[1] = env->regs[1];
596 (*regs)[2] = env->regs[2];
597 (*regs)[3] = env->regs[3];
598 (*regs)[4] = env->regs[4];
599 (*regs)[5] = env->regs[5];
600 (*regs)[6] = env->regs[6];
601 (*regs)[7] = env->regs[7];
602 (*regs)[8] = env->regs[8];
603 (*regs)[9] = env->regs[9];
604 (*regs)[10] = env->regs[10];
605 (*regs)[11] = env->regs[11];
606 (*regs)[12] = env->regs[12];
607 (*regs)[13] = env->regs[13];
608 (*regs)[14] = env->regs[14];
609 (*regs)[15] = env->regs[15];
610 (*regs)[16] = env->regs[16];
611 (*regs)[17] = env->regs[17];
612 (*regs)[18] = env->regs[18];
613 (*regs)[19] = env->regs[19];
614 (*regs)[20] = env->regs[20];
615 (*regs)[21] = env->regs[21];
616 (*regs)[22] = env->regs[22];
617 (*regs)[23] = env->regs[23];
618 (*regs)[24] = env->regs[24];
619 (*regs)[25] = env->regs[25];
620 (*regs)[26] = env->regs[26];
621 (*regs)[27] = env->regs[27];
622 (*regs)[28] = env->regs[28];
623 (*regs)[29] = env->regs[29];
624 (*regs)[30] = env->regs[30];
625 (*regs)[31] = env->regs[31];
626
627 (*regs)[32] = cpu_asr_read((CPUUniCore32State *)env);
628 (*regs)[33] = env->regs[0]; /* XXX */
629 }
630
631 #define USE_ELF_CORE_DUMP
632 #define ELF_EXEC_PAGESIZE 4096
633
634 #define ELF_HWCAP (UC32_HWCAP_CMOV | UC32_HWCAP_UCF64)
635
636 #endif
637
638 #ifdef TARGET_SPARC
639 #ifdef TARGET_SPARC64
640
641 #define ELF_START_MMAP 0x80000000
642 #define ELF_HWCAP (HWCAP_SPARC_FLUSH | HWCAP_SPARC_STBAR | HWCAP_SPARC_SWAP \
643 | HWCAP_SPARC_MULDIV | HWCAP_SPARC_V9)
644 #ifndef TARGET_ABI32
645 #define elf_check_arch(x) ( (x) == EM_SPARCV9 || (x) == EM_SPARC32PLUS )
646 #else
647 #define elf_check_arch(x) ( (x) == EM_SPARC32PLUS || (x) == EM_SPARC )
648 #endif
649
650 #define ELF_CLASS ELFCLASS64
651 #define ELF_ARCH EM_SPARCV9
652
653 #define STACK_BIAS 2047
654
655 static inline void init_thread(struct target_pt_regs *regs,
656 struct image_info *infop)
657 {
658 #ifndef TARGET_ABI32
659 regs->tstate = 0;
660 #endif
661 regs->pc = infop->entry;
662 regs->npc = regs->pc + 4;
663 regs->y = 0;
664 #ifdef TARGET_ABI32
665 regs->u_regs[14] = infop->start_stack - 16 * 4;
666 #else
667 if (personality(infop->personality) == PER_LINUX32)
668 regs->u_regs[14] = infop->start_stack - 16 * 4;
669 else
670 regs->u_regs[14] = infop->start_stack - 16 * 8 - STACK_BIAS;
671 #endif
672 }
673
674 #else
675 #define ELF_START_MMAP 0x80000000
676 #define ELF_HWCAP (HWCAP_SPARC_FLUSH | HWCAP_SPARC_STBAR | HWCAP_SPARC_SWAP \
677 | HWCAP_SPARC_MULDIV)
678
679 #define ELF_CLASS ELFCLASS32
680 #define ELF_ARCH EM_SPARC
681
682 static inline void init_thread(struct target_pt_regs *regs,
683 struct image_info *infop)
684 {
685 regs->psr = 0;
686 regs->pc = infop->entry;
687 regs->npc = regs->pc + 4;
688 regs->y = 0;
689 regs->u_regs[14] = infop->start_stack - 16 * 4;
690 }
691
692 #endif
693 #endif
694
695 #ifdef TARGET_PPC
696
697 #define ELF_MACHINE PPC_ELF_MACHINE
698 #define ELF_START_MMAP 0x80000000
699
700 #if defined(TARGET_PPC64) && !defined(TARGET_ABI32)
701
702 #define elf_check_arch(x) ( (x) == EM_PPC64 )
703
704 #define ELF_CLASS ELFCLASS64
705
706 #else
707
708 #define ELF_CLASS ELFCLASS32
709
710 #endif
711
712 #define ELF_ARCH EM_PPC
713
714 /* Feature masks for the Aux Vector Hardware Capabilities (AT_HWCAP).
715 See arch/powerpc/include/asm/cputable.h. */
716 enum {
717 QEMU_PPC_FEATURE_32 = 0x80000000,
718 QEMU_PPC_FEATURE_64 = 0x40000000,
719 QEMU_PPC_FEATURE_601_INSTR = 0x20000000,
720 QEMU_PPC_FEATURE_HAS_ALTIVEC = 0x10000000,
721 QEMU_PPC_FEATURE_HAS_FPU = 0x08000000,
722 QEMU_PPC_FEATURE_HAS_MMU = 0x04000000,
723 QEMU_PPC_FEATURE_HAS_4xxMAC = 0x02000000,
724 QEMU_PPC_FEATURE_UNIFIED_CACHE = 0x01000000,
725 QEMU_PPC_FEATURE_HAS_SPE = 0x00800000,
726 QEMU_PPC_FEATURE_HAS_EFP_SINGLE = 0x00400000,
727 QEMU_PPC_FEATURE_HAS_EFP_DOUBLE = 0x00200000,
728 QEMU_PPC_FEATURE_NO_TB = 0x00100000,
729 QEMU_PPC_FEATURE_POWER4 = 0x00080000,
730 QEMU_PPC_FEATURE_POWER5 = 0x00040000,
731 QEMU_PPC_FEATURE_POWER5_PLUS = 0x00020000,
732 QEMU_PPC_FEATURE_CELL = 0x00010000,
733 QEMU_PPC_FEATURE_BOOKE = 0x00008000,
734 QEMU_PPC_FEATURE_SMT = 0x00004000,
735 QEMU_PPC_FEATURE_ICACHE_SNOOP = 0x00002000,
736 QEMU_PPC_FEATURE_ARCH_2_05 = 0x00001000,
737 QEMU_PPC_FEATURE_PA6T = 0x00000800,
738 QEMU_PPC_FEATURE_HAS_DFP = 0x00000400,
739 QEMU_PPC_FEATURE_POWER6_EXT = 0x00000200,
740 QEMU_PPC_FEATURE_ARCH_2_06 = 0x00000100,
741 QEMU_PPC_FEATURE_HAS_VSX = 0x00000080,
742 QEMU_PPC_FEATURE_PSERIES_PERFMON_COMPAT = 0x00000040,
743
744 QEMU_PPC_FEATURE_TRUE_LE = 0x00000002,
745 QEMU_PPC_FEATURE_PPC_LE = 0x00000001,
746
747 /* Feature definitions in AT_HWCAP2. */
748 QEMU_PPC_FEATURE2_ARCH_2_07 = 0x80000000, /* ISA 2.07 */
749 QEMU_PPC_FEATURE2_HAS_HTM = 0x40000000, /* Hardware Transactional Memory */
750 QEMU_PPC_FEATURE2_HAS_DSCR = 0x20000000, /* Data Stream Control Register */
751 QEMU_PPC_FEATURE2_HAS_EBB = 0x10000000, /* Event Base Branching */
752 QEMU_PPC_FEATURE2_HAS_ISEL = 0x08000000, /* Integer Select */
753 QEMU_PPC_FEATURE2_HAS_TAR = 0x04000000, /* Target Address Register */
754 };
755
756 #define ELF_HWCAP get_elf_hwcap()
757
758 static uint32_t get_elf_hwcap(void)
759 {
760 PowerPCCPU *cpu = POWERPC_CPU(thread_cpu);
761 uint32_t features = 0;
762
763 /* We don't have to be terribly complete here; the high points are
764 Altivec/FP/SPE support. Anything else is just a bonus. */
765 #define GET_FEATURE(flag, feature) \
766 do { if (cpu->env.insns_flags & flag) { features |= feature; } } while (0)
767 #define GET_FEATURE2(flags, feature) \
768 do { \
769 if ((cpu->env.insns_flags2 & flags) == flags) { \
770 features |= feature; \
771 } \
772 } while (0)
773 GET_FEATURE(PPC_64B, QEMU_PPC_FEATURE_64);
774 GET_FEATURE(PPC_FLOAT, QEMU_PPC_FEATURE_HAS_FPU);
775 GET_FEATURE(PPC_ALTIVEC, QEMU_PPC_FEATURE_HAS_ALTIVEC);
776 GET_FEATURE(PPC_SPE, QEMU_PPC_FEATURE_HAS_SPE);
777 GET_FEATURE(PPC_SPE_SINGLE, QEMU_PPC_FEATURE_HAS_EFP_SINGLE);
778 GET_FEATURE(PPC_SPE_DOUBLE, QEMU_PPC_FEATURE_HAS_EFP_DOUBLE);
779 GET_FEATURE(PPC_BOOKE, QEMU_PPC_FEATURE_BOOKE);
780 GET_FEATURE(PPC_405_MAC, QEMU_PPC_FEATURE_HAS_4xxMAC);
781 GET_FEATURE2(PPC2_DFP, QEMU_PPC_FEATURE_HAS_DFP);
782 GET_FEATURE2(PPC2_VSX, QEMU_PPC_FEATURE_HAS_VSX);
783 GET_FEATURE2((PPC2_PERM_ISA206 | PPC2_DIVE_ISA206 | PPC2_ATOMIC_ISA206 |
784 PPC2_FP_CVT_ISA206 | PPC2_FP_TST_ISA206),
785 QEMU_PPC_FEATURE_ARCH_2_06);
786 #undef GET_FEATURE
787 #undef GET_FEATURE2
788
789 return features;
790 }
791
792 #define ELF_HWCAP2 get_elf_hwcap2()
793
794 static uint32_t get_elf_hwcap2(void)
795 {
796 PowerPCCPU *cpu = POWERPC_CPU(thread_cpu);
797 uint32_t features = 0;
798
799 #define GET_FEATURE(flag, feature) \
800 do { if (cpu->env.insns_flags & flag) { features |= feature; } } while (0)
801 #define GET_FEATURE2(flag, feature) \
802 do { if (cpu->env.insns_flags2 & flag) { features |= feature; } } while (0)
803
804 GET_FEATURE(PPC_ISEL, QEMU_PPC_FEATURE2_HAS_ISEL);
805 GET_FEATURE2(PPC2_BCTAR_ISA207, QEMU_PPC_FEATURE2_HAS_TAR);
806 GET_FEATURE2((PPC2_BCTAR_ISA207 | PPC2_LSQ_ISA207 | PPC2_ALTIVEC_207 |
807 PPC2_ISA207S), QEMU_PPC_FEATURE2_ARCH_2_07);
808
809 #undef GET_FEATURE
810 #undef GET_FEATURE2
811
812 return features;
813 }
814
815 /*
816 * The requirements here are:
817 * - keep the final alignment of sp (sp & 0xf)
818 * - make sure the 32-bit value at the first 16 byte aligned position of
819 * AUXV is greater than 16 for glibc compatibility.
820 * AT_IGNOREPPC is used for that.
821 * - for compatibility with glibc ARCH_DLINFO must always be defined on PPC,
822 * even if DLINFO_ARCH_ITEMS goes to zero or is undefined.
823 */
824 #define DLINFO_ARCH_ITEMS 5
825 #define ARCH_DLINFO \
826 do { \
827 PowerPCCPU *cpu = POWERPC_CPU(thread_cpu); \
828 /* \
829 * Handle glibc compatibility: these magic entries must \
830 * be at the lowest addresses in the final auxv. \
831 */ \
832 NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \
833 NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \
834 NEW_AUX_ENT(AT_DCACHEBSIZE, cpu->env.dcache_line_size); \
835 NEW_AUX_ENT(AT_ICACHEBSIZE, cpu->env.icache_line_size); \
836 NEW_AUX_ENT(AT_UCACHEBSIZE, 0); \
837 } while (0)
838
839 static inline void init_thread(struct target_pt_regs *_regs, struct image_info *infop)
840 {
841 _regs->gpr[1] = infop->start_stack;
842 #if defined(TARGET_PPC64) && !defined(TARGET_ABI32)
843 if (get_ppc64_abi(infop) < 2) {
844 uint64_t val;
845 get_user_u64(val, infop->entry + 8);
846 _regs->gpr[2] = val + infop->load_bias;
847 get_user_u64(val, infop->entry);
848 infop->entry = val + infop->load_bias;
849 } else {
850 _regs->gpr[12] = infop->entry; /* r12 set to global entry address */
851 }
852 #endif
853 _regs->nip = infop->entry;
854 }
855
856 /* See linux kernel: arch/powerpc/include/asm/elf.h. */
857 #define ELF_NREG 48
858 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
859
860 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUPPCState *env)
861 {
862 int i;
863 target_ulong ccr = 0;
864
865 for (i = 0; i < ARRAY_SIZE(env->gpr); i++) {
866 (*regs)[i] = tswapreg(env->gpr[i]);
867 }
868
869 (*regs)[32] = tswapreg(env->nip);
870 (*regs)[33] = tswapreg(env->msr);
871 (*regs)[35] = tswapreg(env->ctr);
872 (*regs)[36] = tswapreg(env->lr);
873 (*regs)[37] = tswapreg(env->xer);
874
875 for (i = 0; i < ARRAY_SIZE(env->crf); i++) {
876 ccr |= env->crf[i] << (32 - ((i + 1) * 4));
877 }
878 (*regs)[38] = tswapreg(ccr);
879 }
880
881 #define USE_ELF_CORE_DUMP
882 #define ELF_EXEC_PAGESIZE 4096
883
884 #endif
885
886 #ifdef TARGET_MIPS
887
888 #define ELF_START_MMAP 0x80000000
889
890 #ifdef TARGET_MIPS64
891 #define ELF_CLASS ELFCLASS64
892 #else
893 #define ELF_CLASS ELFCLASS32
894 #endif
895 #define ELF_ARCH EM_MIPS
896
897 static inline void init_thread(struct target_pt_regs *regs,
898 struct image_info *infop)
899 {
900 regs->cp0_status = 2 << CP0St_KSU;
901 regs->cp0_epc = infop->entry;
902 regs->regs[29] = infop->start_stack;
903 }
904
905 /* See linux kernel: arch/mips/include/asm/elf.h. */
906 #define ELF_NREG 45
907 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
908
909 /* See linux kernel: arch/mips/include/asm/reg.h. */
910 enum {
911 #ifdef TARGET_MIPS64
912 TARGET_EF_R0 = 0,
913 #else
914 TARGET_EF_R0 = 6,
915 #endif
916 TARGET_EF_R26 = TARGET_EF_R0 + 26,
917 TARGET_EF_R27 = TARGET_EF_R0 + 27,
918 TARGET_EF_LO = TARGET_EF_R0 + 32,
919 TARGET_EF_HI = TARGET_EF_R0 + 33,
920 TARGET_EF_CP0_EPC = TARGET_EF_R0 + 34,
921 TARGET_EF_CP0_BADVADDR = TARGET_EF_R0 + 35,
922 TARGET_EF_CP0_STATUS = TARGET_EF_R0 + 36,
923 TARGET_EF_CP0_CAUSE = TARGET_EF_R0 + 37
924 };
925
926 /* See linux kernel: arch/mips/kernel/process.c:elf_dump_regs. */
927 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUMIPSState *env)
928 {
929 int i;
930
931 for (i = 0; i < TARGET_EF_R0; i++) {
932 (*regs)[i] = 0;
933 }
934 (*regs)[TARGET_EF_R0] = 0;
935
936 for (i = 1; i < ARRAY_SIZE(env->active_tc.gpr); i++) {
937 (*regs)[TARGET_EF_R0 + i] = tswapreg(env->active_tc.gpr[i]);
938 }
939
940 (*regs)[TARGET_EF_R26] = 0;
941 (*regs)[TARGET_EF_R27] = 0;
942 (*regs)[TARGET_EF_LO] = tswapreg(env->active_tc.LO[0]);
943 (*regs)[TARGET_EF_HI] = tswapreg(env->active_tc.HI[0]);
944 (*regs)[TARGET_EF_CP0_EPC] = tswapreg(env->active_tc.PC);
945 (*regs)[TARGET_EF_CP0_BADVADDR] = tswapreg(env->CP0_BadVAddr);
946 (*regs)[TARGET_EF_CP0_STATUS] = tswapreg(env->CP0_Status);
947 (*regs)[TARGET_EF_CP0_CAUSE] = tswapreg(env->CP0_Cause);
948 }
949
950 #define USE_ELF_CORE_DUMP
951 #define ELF_EXEC_PAGESIZE 4096
952
953 #endif /* TARGET_MIPS */
954
955 #ifdef TARGET_MICROBLAZE
956
957 #define ELF_START_MMAP 0x80000000
958
959 #define elf_check_arch(x) ( (x) == EM_MICROBLAZE || (x) == EM_MICROBLAZE_OLD)
960
961 #define ELF_CLASS ELFCLASS32
962 #define ELF_ARCH EM_MICROBLAZE
963
964 static inline void init_thread(struct target_pt_regs *regs,
965 struct image_info *infop)
966 {
967 regs->pc = infop->entry;
968 regs->r1 = infop->start_stack;
969
970 }
971
972 #define ELF_EXEC_PAGESIZE 4096
973
974 #define USE_ELF_CORE_DUMP
975 #define ELF_NREG 38
976 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
977
978 /* See linux kernel: arch/mips/kernel/process.c:elf_dump_regs. */
979 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUMBState *env)
980 {
981 int i, pos = 0;
982
983 for (i = 0; i < 32; i++) {
984 (*regs)[pos++] = tswapreg(env->regs[i]);
985 }
986
987 for (i = 0; i < 6; i++) {
988 (*regs)[pos++] = tswapreg(env->sregs[i]);
989 }
990 }
991
992 #endif /* TARGET_MICROBLAZE */
993
994 #ifdef TARGET_NIOS2
995
996 #define ELF_START_MMAP 0x80000000
997
998 #define elf_check_arch(x) ((x) == EM_ALTERA_NIOS2)
999
1000 #define ELF_CLASS ELFCLASS32
1001 #define ELF_ARCH EM_ALTERA_NIOS2
1002
1003 static void init_thread(struct target_pt_regs *regs, struct image_info *infop)
1004 {
1005 regs->ea = infop->entry;
1006 regs->sp = infop->start_stack;
1007 regs->estatus = 0x3;
1008 }
1009
1010 #define ELF_EXEC_PAGESIZE 4096
1011
1012 #define USE_ELF_CORE_DUMP
1013 #define ELF_NREG 49
1014 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1015
1016 /* See linux kernel: arch/mips/kernel/process.c:elf_dump_regs. */
1017 static void elf_core_copy_regs(target_elf_gregset_t *regs,
1018 const CPUNios2State *env)
1019 {
1020 int i;
1021
1022 (*regs)[0] = -1;
1023 for (i = 1; i < 8; i++) /* r0-r7 */
1024 (*regs)[i] = tswapreg(env->regs[i + 7]);
1025
1026 for (i = 8; i < 16; i++) /* r8-r15 */
1027 (*regs)[i] = tswapreg(env->regs[i - 8]);
1028
1029 for (i = 16; i < 24; i++) /* r16-r23 */
1030 (*regs)[i] = tswapreg(env->regs[i + 7]);
1031 (*regs)[24] = -1; /* R_ET */
1032 (*regs)[25] = -1; /* R_BT */
1033 (*regs)[26] = tswapreg(env->regs[R_GP]);
1034 (*regs)[27] = tswapreg(env->regs[R_SP]);
1035 (*regs)[28] = tswapreg(env->regs[R_FP]);
1036 (*regs)[29] = tswapreg(env->regs[R_EA]);
1037 (*regs)[30] = -1; /* R_SSTATUS */
1038 (*regs)[31] = tswapreg(env->regs[R_RA]);
1039
1040 (*regs)[32] = tswapreg(env->regs[R_PC]);
1041
1042 (*regs)[33] = -1; /* R_STATUS */
1043 (*regs)[34] = tswapreg(env->regs[CR_ESTATUS]);
1044
1045 for (i = 35; i < 49; i++) /* ... */
1046 (*regs)[i] = -1;
1047 }
1048
1049 #endif /* TARGET_NIOS2 */
1050
1051 #ifdef TARGET_OPENRISC
1052
1053 #define ELF_START_MMAP 0x08000000
1054
1055 #define ELF_ARCH EM_OPENRISC
1056 #define ELF_CLASS ELFCLASS32
1057 #define ELF_DATA ELFDATA2MSB
1058
1059 static inline void init_thread(struct target_pt_regs *regs,
1060 struct image_info *infop)
1061 {
1062 regs->pc = infop->entry;
1063 regs->gpr[1] = infop->start_stack;
1064 }
1065
1066 #define USE_ELF_CORE_DUMP
1067 #define ELF_EXEC_PAGESIZE 8192
1068
1069 /* See linux kernel arch/openrisc/include/asm/elf.h. */
1070 #define ELF_NREG 34 /* gprs and pc, sr */
1071 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1072
1073 static void elf_core_copy_regs(target_elf_gregset_t *regs,
1074 const CPUOpenRISCState *env)
1075 {
1076 int i;
1077
1078 for (i = 0; i < 32; i++) {
1079 (*regs)[i] = tswapreg(cpu_get_gpr(env, i));
1080 }
1081 (*regs)[32] = tswapreg(env->pc);
1082 (*regs)[33] = tswapreg(cpu_get_sr(env));
1083 }
1084 #define ELF_HWCAP 0
1085 #define ELF_PLATFORM NULL
1086
1087 #endif /* TARGET_OPENRISC */
1088
1089 #ifdef TARGET_SH4
1090
1091 #define ELF_START_MMAP 0x80000000
1092
1093 #define ELF_CLASS ELFCLASS32
1094 #define ELF_ARCH EM_SH
1095
1096 static inline void init_thread(struct target_pt_regs *regs,
1097 struct image_info *infop)
1098 {
1099 /* Check other registers XXXXX */
1100 regs->pc = infop->entry;
1101 regs->regs[15] = infop->start_stack;
1102 }
1103
1104 /* See linux kernel: arch/sh/include/asm/elf.h. */
1105 #define ELF_NREG 23
1106 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1107
1108 /* See linux kernel: arch/sh/include/asm/ptrace.h. */
1109 enum {
1110 TARGET_REG_PC = 16,
1111 TARGET_REG_PR = 17,
1112 TARGET_REG_SR = 18,
1113 TARGET_REG_GBR = 19,
1114 TARGET_REG_MACH = 20,
1115 TARGET_REG_MACL = 21,
1116 TARGET_REG_SYSCALL = 22
1117 };
1118
1119 static inline void elf_core_copy_regs(target_elf_gregset_t *regs,
1120 const CPUSH4State *env)
1121 {
1122 int i;
1123
1124 for (i = 0; i < 16; i++) {
1125 (*regs)[i] = tswapreg(env->gregs[i]);
1126 }
1127
1128 (*regs)[TARGET_REG_PC] = tswapreg(env->pc);
1129 (*regs)[TARGET_REG_PR] = tswapreg(env->pr);
1130 (*regs)[TARGET_REG_SR] = tswapreg(env->sr);
1131 (*regs)[TARGET_REG_GBR] = tswapreg(env->gbr);
1132 (*regs)[TARGET_REG_MACH] = tswapreg(env->mach);
1133 (*regs)[TARGET_REG_MACL] = tswapreg(env->macl);
1134 (*regs)[TARGET_REG_SYSCALL] = 0; /* FIXME */
1135 }
1136
1137 #define USE_ELF_CORE_DUMP
1138 #define ELF_EXEC_PAGESIZE 4096
1139
1140 enum {
1141 SH_CPU_HAS_FPU = 0x0001, /* Hardware FPU support */
1142 SH_CPU_HAS_P2_FLUSH_BUG = 0x0002, /* Need to flush the cache in P2 area */
1143 SH_CPU_HAS_MMU_PAGE_ASSOC = 0x0004, /* SH3: TLB way selection bit support */
1144 SH_CPU_HAS_DSP = 0x0008, /* SH-DSP: DSP support */
1145 SH_CPU_HAS_PERF_COUNTER = 0x0010, /* Hardware performance counters */
1146 SH_CPU_HAS_PTEA = 0x0020, /* PTEA register */
1147 SH_CPU_HAS_LLSC = 0x0040, /* movli.l/movco.l */
1148 SH_CPU_HAS_L2_CACHE = 0x0080, /* Secondary cache / URAM */
1149 SH_CPU_HAS_OP32 = 0x0100, /* 32-bit instruction support */
1150 SH_CPU_HAS_PTEAEX = 0x0200, /* PTE ASID Extension support */
1151 };
1152
1153 #define ELF_HWCAP get_elf_hwcap()
1154
1155 static uint32_t get_elf_hwcap(void)
1156 {
1157 SuperHCPU *cpu = SUPERH_CPU(thread_cpu);
1158 uint32_t hwcap = 0;
1159
1160 hwcap |= SH_CPU_HAS_FPU;
1161
1162 if (cpu->env.features & SH_FEATURE_SH4A) {
1163 hwcap |= SH_CPU_HAS_LLSC;
1164 }
1165
1166 return hwcap;
1167 }
1168
1169 #endif
1170
1171 #ifdef TARGET_CRIS
1172
1173 #define ELF_START_MMAP 0x80000000
1174
1175 #define ELF_CLASS ELFCLASS32
1176 #define ELF_ARCH EM_CRIS
1177
1178 static inline void init_thread(struct target_pt_regs *regs,
1179 struct image_info *infop)
1180 {
1181 regs->erp = infop->entry;
1182 }
1183
1184 #define ELF_EXEC_PAGESIZE 8192
1185
1186 #endif
1187
1188 #ifdef TARGET_M68K
1189
1190 #define ELF_START_MMAP 0x80000000
1191
1192 #define ELF_CLASS ELFCLASS32
1193 #define ELF_ARCH EM_68K
1194
1195 /* ??? Does this need to do anything?
1196 #define ELF_PLAT_INIT(_r) */
1197
1198 static inline void init_thread(struct target_pt_regs *regs,
1199 struct image_info *infop)
1200 {
1201 regs->usp = infop->start_stack;
1202 regs->sr = 0;
1203 regs->pc = infop->entry;
1204 }
1205
1206 /* See linux kernel: arch/m68k/include/asm/elf.h. */
1207 #define ELF_NREG 20
1208 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1209
1210 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUM68KState *env)
1211 {
1212 (*regs)[0] = tswapreg(env->dregs[1]);
1213 (*regs)[1] = tswapreg(env->dregs[2]);
1214 (*regs)[2] = tswapreg(env->dregs[3]);
1215 (*regs)[3] = tswapreg(env->dregs[4]);
1216 (*regs)[4] = tswapreg(env->dregs[5]);
1217 (*regs)[5] = tswapreg(env->dregs[6]);
1218 (*regs)[6] = tswapreg(env->dregs[7]);
1219 (*regs)[7] = tswapreg(env->aregs[0]);
1220 (*regs)[8] = tswapreg(env->aregs[1]);
1221 (*regs)[9] = tswapreg(env->aregs[2]);
1222 (*regs)[10] = tswapreg(env->aregs[3]);
1223 (*regs)[11] = tswapreg(env->aregs[4]);
1224 (*regs)[12] = tswapreg(env->aregs[5]);
1225 (*regs)[13] = tswapreg(env->aregs[6]);
1226 (*regs)[14] = tswapreg(env->dregs[0]);
1227 (*regs)[15] = tswapreg(env->aregs[7]);
1228 (*regs)[16] = tswapreg(env->dregs[0]); /* FIXME: orig_d0 */
1229 (*regs)[17] = tswapreg(env->sr);
1230 (*regs)[18] = tswapreg(env->pc);
1231 (*regs)[19] = 0; /* FIXME: regs->format | regs->vector */
1232 }
1233
1234 #define USE_ELF_CORE_DUMP
1235 #define ELF_EXEC_PAGESIZE 8192
1236
1237 #endif
1238
1239 #ifdef TARGET_ALPHA
1240
1241 #define ELF_START_MMAP (0x30000000000ULL)
1242
1243 #define ELF_CLASS ELFCLASS64
1244 #define ELF_ARCH EM_ALPHA
1245
1246 static inline void init_thread(struct target_pt_regs *regs,
1247 struct image_info *infop)
1248 {
1249 regs->pc = infop->entry;
1250 regs->ps = 8;
1251 regs->usp = infop->start_stack;
1252 }
1253
1254 #define ELF_EXEC_PAGESIZE 8192
1255
1256 #endif /* TARGET_ALPHA */
1257
1258 #ifdef TARGET_S390X
1259
1260 #define ELF_START_MMAP (0x20000000000ULL)
1261
1262 #define ELF_CLASS ELFCLASS64
1263 #define ELF_DATA ELFDATA2MSB
1264 #define ELF_ARCH EM_S390
1265
1266 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
1267 {
1268 regs->psw.addr = infop->entry;
1269 regs->psw.mask = PSW_MASK_64 | PSW_MASK_32;
1270 regs->gprs[15] = infop->start_stack;
1271 }
1272
1273 #endif /* TARGET_S390X */
1274
1275 #ifdef TARGET_TILEGX
1276
1277 /* 42 bits real used address, a half for user mode */
1278 #define ELF_START_MMAP (0x00000020000000000ULL)
1279
1280 #define elf_check_arch(x) ((x) == EM_TILEGX)
1281
1282 #define ELF_CLASS ELFCLASS64
1283 #define ELF_DATA ELFDATA2LSB
1284 #define ELF_ARCH EM_TILEGX
1285
1286 static inline void init_thread(struct target_pt_regs *regs,
1287 struct image_info *infop)
1288 {
1289 regs->pc = infop->entry;
1290 regs->sp = infop->start_stack;
1291
1292 }
1293
1294 #define ELF_EXEC_PAGESIZE 65536 /* TILE-Gx page size is 64KB */
1295
1296 #endif /* TARGET_TILEGX */
1297
1298 #ifdef TARGET_RISCV
1299
1300 #define ELF_START_MMAP 0x80000000
1301 #define ELF_ARCH EM_RISCV
1302
1303 #ifdef TARGET_RISCV32
1304 #define ELF_CLASS ELFCLASS32
1305 #else
1306 #define ELF_CLASS ELFCLASS64
1307 #endif
1308
1309 static inline void init_thread(struct target_pt_regs *regs,
1310 struct image_info *infop)
1311 {
1312 regs->sepc = infop->entry;
1313 regs->sp = infop->start_stack;
1314 }
1315
1316 #define ELF_EXEC_PAGESIZE 4096
1317
1318 #endif /* TARGET_RISCV */
1319
1320 #ifdef TARGET_HPPA
1321
1322 #define ELF_START_MMAP 0x80000000
1323 #define ELF_CLASS ELFCLASS32
1324 #define ELF_ARCH EM_PARISC
1325 #define ELF_PLATFORM "PARISC"
1326 #define STACK_GROWS_DOWN 0
1327 #define STACK_ALIGNMENT 64
1328
1329 static inline void init_thread(struct target_pt_regs *regs,
1330 struct image_info *infop)
1331 {
1332 regs->iaoq[0] = infop->entry;
1333 regs->iaoq[1] = infop->entry + 4;
1334 regs->gr[23] = 0;
1335 regs->gr[24] = infop->arg_start;
1336 regs->gr[25] = (infop->arg_end - infop->arg_start) / sizeof(abi_ulong);
1337 /* The top-of-stack contains a linkage buffer. */
1338 regs->gr[30] = infop->start_stack + 64;
1339 regs->gr[31] = infop->entry;
1340 }
1341
1342 #endif /* TARGET_HPPA */
1343
1344 #ifdef TARGET_XTENSA
1345
1346 #define ELF_START_MMAP 0x20000000
1347
1348 #define ELF_CLASS ELFCLASS32
1349 #define ELF_ARCH EM_XTENSA
1350
1351 static inline void init_thread(struct target_pt_regs *regs,
1352 struct image_info *infop)
1353 {
1354 regs->windowbase = 0;
1355 regs->windowstart = 1;
1356 regs->areg[1] = infop->start_stack;
1357 regs->pc = infop->entry;
1358 }
1359
1360 /* See linux kernel: arch/xtensa/include/asm/elf.h. */
1361 #define ELF_NREG 128
1362 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1363
1364 enum {
1365 TARGET_REG_PC,
1366 TARGET_REG_PS,
1367 TARGET_REG_LBEG,
1368 TARGET_REG_LEND,
1369 TARGET_REG_LCOUNT,
1370 TARGET_REG_SAR,
1371 TARGET_REG_WINDOWSTART,
1372 TARGET_REG_WINDOWBASE,
1373 TARGET_REG_THREADPTR,
1374 TARGET_REG_AR0 = 64,
1375 };
1376
1377 static void elf_core_copy_regs(target_elf_gregset_t *regs,
1378 const CPUXtensaState *env)
1379 {
1380 unsigned i;
1381
1382 (*regs)[TARGET_REG_PC] = tswapreg(env->pc);
1383 (*regs)[TARGET_REG_PS] = tswapreg(env->sregs[PS] & ~PS_EXCM);
1384 (*regs)[TARGET_REG_LBEG] = tswapreg(env->sregs[LBEG]);
1385 (*regs)[TARGET_REG_LEND] = tswapreg(env->sregs[LEND]);
1386 (*regs)[TARGET_REG_LCOUNT] = tswapreg(env->sregs[LCOUNT]);
1387 (*regs)[TARGET_REG_SAR] = tswapreg(env->sregs[SAR]);
1388 (*regs)[TARGET_REG_WINDOWSTART] = tswapreg(env->sregs[WINDOW_START]);
1389 (*regs)[TARGET_REG_WINDOWBASE] = tswapreg(env->sregs[WINDOW_BASE]);
1390 (*regs)[TARGET_REG_THREADPTR] = tswapreg(env->uregs[THREADPTR]);
1391 xtensa_sync_phys_from_window((CPUXtensaState *)env);
1392 for (i = 0; i < env->config->nareg; ++i) {
1393 (*regs)[TARGET_REG_AR0 + i] = tswapreg(env->phys_regs[i]);
1394 }
1395 }
1396
1397 #define USE_ELF_CORE_DUMP
1398 #define ELF_EXEC_PAGESIZE 4096
1399
1400 #endif /* TARGET_XTENSA */
1401
1402 #ifndef ELF_PLATFORM
1403 #define ELF_PLATFORM (NULL)
1404 #endif
1405
1406 #ifndef ELF_MACHINE
1407 #define ELF_MACHINE ELF_ARCH
1408 #endif
1409
1410 #ifndef elf_check_arch
1411 #define elf_check_arch(x) ((x) == ELF_ARCH)
1412 #endif
1413
1414 #ifndef ELF_HWCAP
1415 #define ELF_HWCAP 0
1416 #endif
1417
1418 #ifndef STACK_GROWS_DOWN
1419 #define STACK_GROWS_DOWN 1
1420 #endif
1421
1422 #ifndef STACK_ALIGNMENT
1423 #define STACK_ALIGNMENT 16
1424 #endif
1425
1426 #ifdef TARGET_ABI32
1427 #undef ELF_CLASS
1428 #define ELF_CLASS ELFCLASS32
1429 #undef bswaptls
1430 #define bswaptls(ptr) bswap32s(ptr)
1431 #endif
1432
1433 #include "elf.h"
1434
1435 struct exec
1436 {
1437 unsigned int a_info; /* Use macros N_MAGIC, etc for access */
1438 unsigned int a_text; /* length of text, in bytes */
1439 unsigned int a_data; /* length of data, in bytes */
1440 unsigned int a_bss; /* length of uninitialized data area, in bytes */
1441 unsigned int a_syms; /* length of symbol table data in file, in bytes */
1442 unsigned int a_entry; /* start address */
1443 unsigned int a_trsize; /* length of relocation info for text, in bytes */
1444 unsigned int a_drsize; /* length of relocation info for data, in bytes */
1445 };
1446
1447
1448 #define N_MAGIC(exec) ((exec).a_info & 0xffff)
1449 #define OMAGIC 0407
1450 #define NMAGIC 0410
1451 #define ZMAGIC 0413
1452 #define QMAGIC 0314
1453
1454 /* Necessary parameters */
1455 #define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE
1456 #define TARGET_ELF_PAGESTART(_v) ((_v) & \
1457 ~(abi_ulong)(TARGET_ELF_EXEC_PAGESIZE-1))
1458 #define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE-1))
1459
1460 #define DLINFO_ITEMS 15
1461
1462 static inline void memcpy_fromfs(void * to, const void * from, unsigned long n)
1463 {
1464 memcpy(to, from, n);
1465 }
1466
1467 #ifdef BSWAP_NEEDED
1468 static void bswap_ehdr(struct elfhdr *ehdr)
1469 {
1470 bswap16s(&ehdr->e_type); /* Object file type */
1471 bswap16s(&ehdr->e_machine); /* Architecture */
1472 bswap32s(&ehdr->e_version); /* Object file version */
1473 bswaptls(&ehdr->e_entry); /* Entry point virtual address */
1474 bswaptls(&ehdr->e_phoff); /* Program header table file offset */
1475 bswaptls(&ehdr->e_shoff); /* Section header table file offset */
1476 bswap32s(&ehdr->e_flags); /* Processor-specific flags */
1477 bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */
1478 bswap16s(&ehdr->e_phentsize); /* Program header table entry size */
1479 bswap16s(&ehdr->e_phnum); /* Program header table entry count */
1480 bswap16s(&ehdr->e_shentsize); /* Section header table entry size */
1481 bswap16s(&ehdr->e_shnum); /* Section header table entry count */
1482 bswap16s(&ehdr->e_shstrndx); /* Section header string table index */
1483 }
1484
1485 static void bswap_phdr(struct elf_phdr *phdr, int phnum)
1486 {
1487 int i;
1488 for (i = 0; i < phnum; ++i, ++phdr) {
1489 bswap32s(&phdr->p_type); /* Segment type */
1490 bswap32s(&phdr->p_flags); /* Segment flags */
1491 bswaptls(&phdr->p_offset); /* Segment file offset */
1492 bswaptls(&phdr->p_vaddr); /* Segment virtual address */
1493 bswaptls(&phdr->p_paddr); /* Segment physical address */
1494 bswaptls(&phdr->p_filesz); /* Segment size in file */
1495 bswaptls(&phdr->p_memsz); /* Segment size in memory */
1496 bswaptls(&phdr->p_align); /* Segment alignment */
1497 }
1498 }
1499
1500 static void bswap_shdr(struct elf_shdr *shdr, int shnum)
1501 {
1502 int i;
1503 for (i = 0; i < shnum; ++i, ++shdr) {
1504 bswap32s(&shdr->sh_name);
1505 bswap32s(&shdr->sh_type);
1506 bswaptls(&shdr->sh_flags);
1507 bswaptls(&shdr->sh_addr);
1508 bswaptls(&shdr->sh_offset);
1509 bswaptls(&shdr->sh_size);
1510 bswap32s(&shdr->sh_link);
1511 bswap32s(&shdr->sh_info);
1512 bswaptls(&shdr->sh_addralign);
1513 bswaptls(&shdr->sh_entsize);
1514 }
1515 }
1516
1517 static void bswap_sym(struct elf_sym *sym)
1518 {
1519 bswap32s(&sym->st_name);
1520 bswaptls(&sym->st_value);
1521 bswaptls(&sym->st_size);
1522 bswap16s(&sym->st_shndx);
1523 }
1524 #else
1525 static inline void bswap_ehdr(struct elfhdr *ehdr) { }
1526 static inline void bswap_phdr(struct elf_phdr *phdr, int phnum) { }
1527 static inline void bswap_shdr(struct elf_shdr *shdr, int shnum) { }
1528 static inline void bswap_sym(struct elf_sym *sym) { }
1529 #endif
1530
1531 #ifdef USE_ELF_CORE_DUMP
1532 static int elf_core_dump(int, const CPUArchState *);
1533 #endif /* USE_ELF_CORE_DUMP */
1534 static void load_symbols(struct elfhdr *hdr, int fd, abi_ulong load_bias);
1535
1536 /* Verify the portions of EHDR within E_IDENT for the target.
1537 This can be performed before bswapping the entire header. */
1538 static bool elf_check_ident(struct elfhdr *ehdr)
1539 {
1540 return (ehdr->e_ident[EI_MAG0] == ELFMAG0
1541 && ehdr->e_ident[EI_MAG1] == ELFMAG1
1542 && ehdr->e_ident[EI_MAG2] == ELFMAG2
1543 && ehdr->e_ident[EI_MAG3] == ELFMAG3
1544 && ehdr->e_ident[EI_CLASS] == ELF_CLASS
1545 && ehdr->e_ident[EI_DATA] == ELF_DATA
1546 && ehdr->e_ident[EI_VERSION] == EV_CURRENT);
1547 }
1548
1549 /* Verify the portions of EHDR outside of E_IDENT for the target.
1550 This has to wait until after bswapping the header. */
1551 static bool elf_check_ehdr(struct elfhdr *ehdr)
1552 {
1553 return (elf_check_arch(ehdr->e_machine)
1554 && ehdr->e_ehsize == sizeof(struct elfhdr)
1555 && ehdr->e_phentsize == sizeof(struct elf_phdr)
1556 && (ehdr->e_type == ET_EXEC || ehdr->e_type == ET_DYN));
1557 }
1558
1559 /*
1560 * 'copy_elf_strings()' copies argument/envelope strings from user
1561 * memory to free pages in kernel mem. These are in a format ready
1562 * to be put directly into the top of new user memory.
1563 *
1564 */
1565 static abi_ulong copy_elf_strings(int argc, char **argv, char *scratch,
1566 abi_ulong p, abi_ulong stack_limit)
1567 {
1568 char *tmp;
1569 int len, i;
1570 abi_ulong top = p;
1571
1572 if (!p) {
1573 return 0; /* bullet-proofing */
1574 }
1575
1576 if (STACK_GROWS_DOWN) {
1577 int offset = ((p - 1) % TARGET_PAGE_SIZE) + 1;
1578 for (i = argc - 1; i >= 0; --i) {
1579 tmp = argv[i];
1580 if (!tmp) {
1581 fprintf(stderr, "VFS: argc is wrong");
1582 exit(-1);
1583 }
1584 len = strlen(tmp) + 1;
1585 tmp += len;
1586
1587 if (len > (p - stack_limit)) {
1588 return 0;
1589 }
1590 while (len) {
1591 int bytes_to_copy = (len > offset) ? offset : len;
1592 tmp -= bytes_to_copy;
1593 p -= bytes_to_copy;
1594 offset -= bytes_to_copy;
1595 len -= bytes_to_copy;
1596
1597 memcpy_fromfs(scratch + offset, tmp, bytes_to_copy);
1598
1599 if (offset == 0) {
1600 memcpy_to_target(p, scratch, top - p);
1601 top = p;
1602 offset = TARGET_PAGE_SIZE;
1603 }
1604 }
1605 }
1606 if (p != top) {
1607 memcpy_to_target(p, scratch + offset, top - p);
1608 }
1609 } else {
1610 int remaining = TARGET_PAGE_SIZE - (p % TARGET_PAGE_SIZE);
1611 for (i = 0; i < argc; ++i) {
1612 tmp = argv[i];
1613 if (!tmp) {
1614 fprintf(stderr, "VFS: argc is wrong");
1615 exit(-1);
1616 }
1617 len = strlen(tmp) + 1;
1618 if (len > (stack_limit - p)) {
1619 return 0;
1620 }
1621 while (len) {
1622 int bytes_to_copy = (len > remaining) ? remaining : len;
1623
1624 memcpy_fromfs(scratch + (p - top), tmp, bytes_to_copy);
1625
1626 tmp += bytes_to_copy;
1627 remaining -= bytes_to_copy;
1628 p += bytes_to_copy;
1629 len -= bytes_to_copy;
1630
1631 if (remaining == 0) {
1632 memcpy_to_target(top, scratch, p - top);
1633 top = p;
1634 remaining = TARGET_PAGE_SIZE;
1635 }
1636 }
1637 }
1638 if (p != top) {
1639 memcpy_to_target(top, scratch, p - top);
1640 }
1641 }
1642
1643 return p;
1644 }
1645
1646 /* Older linux kernels provide up to MAX_ARG_PAGES (default: 32) of
1647 * argument/environment space. Newer kernels (>2.6.33) allow more,
1648 * dependent on stack size, but guarantee at least 32 pages for
1649 * backwards compatibility.
1650 */
1651 #define STACK_LOWER_LIMIT (32 * TARGET_PAGE_SIZE)
1652
1653 static abi_ulong setup_arg_pages(struct linux_binprm *bprm,
1654 struct image_info *info)
1655 {
1656 abi_ulong size, error, guard;
1657
1658 size = guest_stack_size;
1659 if (size < STACK_LOWER_LIMIT) {
1660 size = STACK_LOWER_LIMIT;
1661 }
1662 guard = TARGET_PAGE_SIZE;
1663 if (guard < qemu_real_host_page_size) {
1664 guard = qemu_real_host_page_size;
1665 }
1666
1667 error = target_mmap(0, size + guard, PROT_READ | PROT_WRITE,
1668 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
1669 if (error == -1) {
1670 perror("mmap stack");
1671 exit(-1);
1672 }
1673
1674 /* We reserve one extra page at the top of the stack as guard. */
1675 if (STACK_GROWS_DOWN) {
1676 target_mprotect(error, guard, PROT_NONE);
1677 info->stack_limit = error + guard;
1678 return info->stack_limit + size - sizeof(void *);
1679 } else {
1680 target_mprotect(error + size, guard, PROT_NONE);
1681 info->stack_limit = error + size;
1682 return error;
1683 }
1684 }
1685
1686 /* Map and zero the bss. We need to explicitly zero any fractional pages
1687 after the data section (i.e. bss). */
1688 static void zero_bss(abi_ulong elf_bss, abi_ulong last_bss, int prot)
1689 {
1690 uintptr_t host_start, host_map_start, host_end;
1691
1692 last_bss = TARGET_PAGE_ALIGN(last_bss);
1693
1694 /* ??? There is confusion between qemu_real_host_page_size and
1695 qemu_host_page_size here and elsewhere in target_mmap, which
1696 may lead to the end of the data section mapping from the file
1697 not being mapped. At least there was an explicit test and
1698 comment for that here, suggesting that "the file size must
1699 be known". The comment probably pre-dates the introduction
1700 of the fstat system call in target_mmap which does in fact
1701 find out the size. What isn't clear is if the workaround
1702 here is still actually needed. For now, continue with it,
1703 but merge it with the "normal" mmap that would allocate the bss. */
1704
1705 host_start = (uintptr_t) g2h(elf_bss);
1706 host_end = (uintptr_t) g2h(last_bss);
1707 host_map_start = REAL_HOST_PAGE_ALIGN(host_start);
1708
1709 if (host_map_start < host_end) {
1710 void *p = mmap((void *)host_map_start, host_end - host_map_start,
1711 prot, MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
1712 if (p == MAP_FAILED) {
1713 perror("cannot mmap brk");
1714 exit(-1);
1715 }
1716 }
1717
1718 /* Ensure that the bss page(s) are valid */
1719 if ((page_get_flags(last_bss-1) & prot) != prot) {
1720 page_set_flags(elf_bss & TARGET_PAGE_MASK, last_bss, prot | PAGE_VALID);
1721 }
1722
1723 if (host_start < host_map_start) {
1724 memset((void *)host_start, 0, host_map_start - host_start);
1725 }
1726 }
1727
1728 #ifdef CONFIG_USE_FDPIC
1729 static abi_ulong loader_build_fdpic_loadmap(struct image_info *info, abi_ulong sp)
1730 {
1731 uint16_t n;
1732 struct elf32_fdpic_loadseg *loadsegs = info->loadsegs;
1733
1734 /* elf32_fdpic_loadseg */
1735 n = info->nsegs;
1736 while (n--) {
1737 sp -= 12;
1738 put_user_u32(loadsegs[n].addr, sp+0);
1739 put_user_u32(loadsegs[n].p_vaddr, sp+4);
1740 put_user_u32(loadsegs[n].p_memsz, sp+8);
1741 }
1742
1743 /* elf32_fdpic_loadmap */
1744 sp -= 4;
1745 put_user_u16(0, sp+0); /* version */
1746 put_user_u16(info->nsegs, sp+2); /* nsegs */
1747
1748 info->personality = PER_LINUX_FDPIC;
1749 info->loadmap_addr = sp;
1750
1751 return sp;
1752 }
1753 #endif
1754
1755 static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
1756 struct elfhdr *exec,
1757 struct image_info *info,
1758 struct image_info *interp_info)
1759 {
1760 abi_ulong sp;
1761 abi_ulong u_argc, u_argv, u_envp, u_auxv;
1762 int size;
1763 int i;
1764 abi_ulong u_rand_bytes;
1765 uint8_t k_rand_bytes[16];
1766 abi_ulong u_platform;
1767 const char *k_platform;
1768 const int n = sizeof(elf_addr_t);
1769
1770 sp = p;
1771
1772 #ifdef CONFIG_USE_FDPIC
1773 /* Needs to be before we load the env/argc/... */
1774 if (elf_is_fdpic(exec)) {
1775 /* Need 4 byte alignment for these structs */
1776 sp &= ~3;
1777 sp = loader_build_fdpic_loadmap(info, sp);
1778 info->other_info = interp_info;
1779 if (interp_info) {
1780 interp_info->other_info = info;
1781 sp = loader_build_fdpic_loadmap(interp_info, sp);
1782 }
1783 }
1784 #endif
1785
1786 u_platform = 0;
1787 k_platform = ELF_PLATFORM;
1788 if (k_platform) {
1789 size_t len = strlen(k_platform) + 1;
1790 if (STACK_GROWS_DOWN) {
1791 sp -= (len + n - 1) & ~(n - 1);
1792 u_platform = sp;
1793 /* FIXME - check return value of memcpy_to_target() for failure */
1794 memcpy_to_target(sp, k_platform, len);
1795 } else {
1796 memcpy_to_target(sp, k_platform, len);
1797 u_platform = sp;
1798 sp += len + 1;
1799 }
1800 }
1801
1802 /* Provide 16 byte alignment for the PRNG, and basic alignment for
1803 * the argv and envp pointers.
1804 */
1805 if (STACK_GROWS_DOWN) {
1806 sp = QEMU_ALIGN_DOWN(sp, 16);
1807 } else {
1808 sp = QEMU_ALIGN_UP(sp, 16);
1809 }
1810
1811 /*
1812 * Generate 16 random bytes for userspace PRNG seeding (not
1813 * cryptically secure but it's not the aim of QEMU).
1814 */
1815 for (i = 0; i < 16; i++) {
1816 k_rand_bytes[i] = rand();
1817 }
1818 if (STACK_GROWS_DOWN) {
1819 sp -= 16;
1820 u_rand_bytes = sp;
1821 /* FIXME - check return value of memcpy_to_target() for failure */
1822 memcpy_to_target(sp, k_rand_bytes, 16);
1823 } else {
1824 memcpy_to_target(sp, k_rand_bytes, 16);
1825 u_rand_bytes = sp;
1826 sp += 16;
1827 }
1828
1829 size = (DLINFO_ITEMS + 1) * 2;
1830 if (k_platform)
1831 size += 2;
1832 #ifdef DLINFO_ARCH_ITEMS
1833 size += DLINFO_ARCH_ITEMS * 2;
1834 #endif
1835 #ifdef ELF_HWCAP2
1836 size += 2;
1837 #endif
1838 info->auxv_len = size * n;
1839
1840 size += envc + argc + 2;
1841 size += 1; /* argc itself */
1842 size *= n;
1843
1844 /* Allocate space and finalize stack alignment for entry now. */
1845 if (STACK_GROWS_DOWN) {
1846 u_argc = QEMU_ALIGN_DOWN(sp - size, STACK_ALIGNMENT);
1847 sp = u_argc;
1848 } else {
1849 u_argc = sp;
1850 sp = QEMU_ALIGN_UP(sp + size, STACK_ALIGNMENT);
1851 }
1852
1853 u_argv = u_argc + n;
1854 u_envp = u_argv + (argc + 1) * n;
1855 u_auxv = u_envp + (envc + 1) * n;
1856 info->saved_auxv = u_auxv;
1857 info->arg_start = u_argv;
1858 info->arg_end = u_argv + argc * n;
1859
1860 /* This is correct because Linux defines
1861 * elf_addr_t as Elf32_Off / Elf64_Off
1862 */
1863 #define NEW_AUX_ENT(id, val) do { \
1864 put_user_ual(id, u_auxv); u_auxv += n; \
1865 put_user_ual(val, u_auxv); u_auxv += n; \
1866 } while(0)
1867
1868 #ifdef ARCH_DLINFO
1869 /*
1870 * ARCH_DLINFO must come first so platform specific code can enforce
1871 * special alignment requirements on the AUXV if necessary (eg. PPC).
1872 */
1873 ARCH_DLINFO;
1874 #endif
1875 /* There must be exactly DLINFO_ITEMS entries here, or the assert
1876 * on info->auxv_len will trigger.
1877 */
1878 NEW_AUX_ENT(AT_PHDR, (abi_ulong)(info->load_addr + exec->e_phoff));
1879 NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof (struct elf_phdr)));
1880 NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum));
1881 NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(MAX(TARGET_PAGE_SIZE, getpagesize())));
1882 NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_info ? interp_info->load_addr : 0));
1883 NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0);
1884 NEW_AUX_ENT(AT_ENTRY, info->entry);
1885 NEW_AUX_ENT(AT_UID, (abi_ulong) getuid());
1886 NEW_AUX_ENT(AT_EUID, (abi_ulong) geteuid());
1887 NEW_AUX_ENT(AT_GID, (abi_ulong) getgid());
1888 NEW_AUX_ENT(AT_EGID, (abi_ulong) getegid());
1889 NEW_AUX_ENT(AT_HWCAP, (abi_ulong) ELF_HWCAP);
1890 NEW_AUX_ENT(AT_CLKTCK, (abi_ulong) sysconf(_SC_CLK_TCK));
1891 NEW_AUX_ENT(AT_RANDOM, (abi_ulong) u_rand_bytes);
1892 NEW_AUX_ENT(AT_SECURE, (abi_ulong) qemu_getauxval(AT_SECURE));
1893
1894 #ifdef ELF_HWCAP2
1895 NEW_AUX_ENT(AT_HWCAP2, (abi_ulong) ELF_HWCAP2);
1896 #endif
1897
1898 if (u_platform) {
1899 NEW_AUX_ENT(AT_PLATFORM, u_platform);
1900 }
1901 NEW_AUX_ENT (AT_NULL, 0);
1902 #undef NEW_AUX_ENT
1903
1904 /* Check that our initial calculation of the auxv length matches how much
1905 * we actually put into it.
1906 */
1907 assert(info->auxv_len == u_auxv - info->saved_auxv);
1908
1909 put_user_ual(argc, u_argc);
1910
1911 p = info->arg_strings;
1912 for (i = 0; i < argc; ++i) {
1913 put_user_ual(p, u_argv);
1914 u_argv += n;
1915 p += target_strlen(p) + 1;
1916 }
1917 put_user_ual(0, u_argv);
1918
1919 p = info->env_strings;
1920 for (i = 0; i < envc; ++i) {
1921 put_user_ual(p, u_envp);
1922 u_envp += n;
1923 p += target_strlen(p) + 1;
1924 }
1925 put_user_ual(0, u_envp);
1926
1927 return sp;
1928 }
1929
1930 #ifndef TARGET_HAS_VALIDATE_GUEST_SPACE
1931 /* If the guest doesn't have a validation function just agree */
1932 static int validate_guest_space(unsigned long guest_base,
1933 unsigned long guest_size)
1934 {
1935 return 1;
1936 }
1937 #endif
1938
1939 unsigned long init_guest_space(unsigned long host_start,
1940 unsigned long host_size,
1941 unsigned long guest_start,
1942 bool fixed)
1943 {
1944 unsigned long current_start, real_start;
1945 int flags;
1946
1947 assert(host_start || host_size);
1948
1949 /* If just a starting address is given, then just verify that
1950 * address. */
1951 if (host_start && !host_size) {
1952 if (validate_guest_space(host_start, host_size) == 1) {
1953 return host_start;
1954 } else {
1955 return (unsigned long)-1;
1956 }
1957 }
1958
1959 /* Setup the initial flags and start address. */
1960 current_start = host_start & qemu_host_page_mask;
1961 flags = MAP_ANONYMOUS | MAP_PRIVATE | MAP_NORESERVE;
1962 if (fixed) {
1963 flags |= MAP_FIXED;
1964 }
1965
1966 /* Otherwise, a non-zero size region of memory needs to be mapped
1967 * and validated. */
1968 while (1) {
1969 unsigned long real_size = host_size;
1970
1971 /* Do not use mmap_find_vma here because that is limited to the
1972 * guest address space. We are going to make the
1973 * guest address space fit whatever we're given.
1974 */
1975 real_start = (unsigned long)
1976 mmap((void *)current_start, host_size, PROT_NONE, flags, -1, 0);
1977 if (real_start == (unsigned long)-1) {
1978 return (unsigned long)-1;
1979 }
1980
1981 /* Ensure the address is properly aligned. */
1982 if (real_start & ~qemu_host_page_mask) {
1983 munmap((void *)real_start, host_size);
1984 real_size = host_size + qemu_host_page_size;
1985 real_start = (unsigned long)
1986 mmap((void *)real_start, real_size, PROT_NONE, flags, -1, 0);
1987 if (real_start == (unsigned long)-1) {
1988 return (unsigned long)-1;
1989 }
1990 real_start = HOST_PAGE_ALIGN(real_start);
1991 }
1992
1993 /* Check to see if the address is valid. */
1994 if (!host_start || real_start == current_start) {
1995 int valid = validate_guest_space(real_start - guest_start,
1996 real_size);
1997 if (valid == 1) {
1998 break;
1999 } else if (valid == -1) {
2000 return (unsigned long)-1;
2001 }
2002 /* valid == 0, so try again. */
2003 }
2004
2005 /* That address didn't work. Unmap and try a different one.
2006 * The address the host picked because is typically right at
2007 * the top of the host address space and leaves the guest with
2008 * no usable address space. Resort to a linear search. We
2009 * already compensated for mmap_min_addr, so this should not
2010 * happen often. Probably means we got unlucky and host
2011 * address space randomization put a shared library somewhere
2012 * inconvenient.
2013 */
2014 munmap((void *)real_start, host_size);
2015 current_start += qemu_host_page_size;
2016 if (host_start == current_start) {
2017 /* Theoretically possible if host doesn't have any suitably
2018 * aligned areas. Normally the first mmap will fail.
2019 */
2020 return (unsigned long)-1;
2021 }
2022 }
2023
2024 qemu_log_mask(CPU_LOG_PAGE, "Reserved 0x%lx bytes of guest address space\n", host_size);
2025
2026 return real_start;
2027 }
2028
2029 static void probe_guest_base(const char *image_name,
2030 abi_ulong loaddr, abi_ulong hiaddr)
2031 {
2032 /* Probe for a suitable guest base address, if the user has not set
2033 * it explicitly, and set guest_base appropriately.
2034 * In case of error we will print a suitable message and exit.
2035 */
2036 const char *errmsg;
2037 if (!have_guest_base && !reserved_va) {
2038 unsigned long host_start, real_start, host_size;
2039
2040 /* Round addresses to page boundaries. */
2041 loaddr &= qemu_host_page_mask;
2042 hiaddr = HOST_PAGE_ALIGN(hiaddr);
2043
2044 if (loaddr < mmap_min_addr) {
2045 host_start = HOST_PAGE_ALIGN(mmap_min_addr);
2046 } else {
2047 host_start = loaddr;
2048 if (host_start != loaddr) {
2049 errmsg = "Address overflow loading ELF binary";
2050 goto exit_errmsg;
2051 }
2052 }
2053 host_size = hiaddr - loaddr;
2054
2055 /* Setup the initial guest memory space with ranges gleaned from
2056 * the ELF image that is being loaded.
2057 */
2058 real_start = init_guest_space(host_start, host_size, loaddr, false);
2059 if (real_start == (unsigned long)-1) {
2060 errmsg = "Unable to find space for application";
2061 goto exit_errmsg;
2062 }
2063 guest_base = real_start - loaddr;
2064
2065 qemu_log_mask(CPU_LOG_PAGE, "Relocating guest address space from 0x"
2066 TARGET_ABI_FMT_lx " to 0x%lx\n",
2067 loaddr, real_start);
2068 }
2069 return;
2070
2071 exit_errmsg:
2072 fprintf(stderr, "%s: %s\n", image_name, errmsg);
2073 exit(-1);
2074 }
2075
2076
2077 /* Load an ELF image into the address space.
2078
2079 IMAGE_NAME is the filename of the image, to use in error messages.
2080 IMAGE_FD is the open file descriptor for the image.
2081
2082 BPRM_BUF is a copy of the beginning of the file; this of course
2083 contains the elf file header at offset 0. It is assumed that this
2084 buffer is sufficiently aligned to present no problems to the host
2085 in accessing data at aligned offsets within the buffer.
2086
2087 On return: INFO values will be filled in, as necessary or available. */
2088
2089 static void load_elf_image(const char *image_name, int image_fd,
2090 struct image_info *info, char **pinterp_name,
2091 char bprm_buf[BPRM_BUF_SIZE])
2092 {
2093 struct elfhdr *ehdr = (struct elfhdr *)bprm_buf;
2094 struct elf_phdr *phdr;
2095 abi_ulong load_addr, load_bias, loaddr, hiaddr, error;
2096 int i, retval;
2097 const char *errmsg;
2098
2099 /* First of all, some simple consistency checks */
2100 errmsg = "Invalid ELF image for this architecture";
2101 if (!elf_check_ident(ehdr)) {
2102 goto exit_errmsg;
2103 }
2104 bswap_ehdr(ehdr);
2105 if (!elf_check_ehdr(ehdr)) {
2106 goto exit_errmsg;
2107 }
2108
2109 i = ehdr->e_phnum * sizeof(struct elf_phdr);
2110 if (ehdr->e_phoff + i <= BPRM_BUF_SIZE) {
2111 phdr = (struct elf_phdr *)(bprm_buf + ehdr->e_phoff);
2112 } else {
2113 phdr = (struct elf_phdr *) alloca(i);
2114 retval = pread(image_fd, phdr, i, ehdr->e_phoff);
2115 if (retval != i) {
2116 goto exit_read;
2117 }
2118 }
2119 bswap_phdr(phdr, ehdr->e_phnum);
2120
2121 #ifdef CONFIG_USE_FDPIC
2122 info->nsegs = 0;
2123 info->pt_dynamic_addr = 0;
2124 #endif
2125
2126 mmap_lock();
2127
2128 /* Find the maximum size of the image and allocate an appropriate
2129 amount of memory to handle that. */
2130 loaddr = -1, hiaddr = 0;
2131 for (i = 0; i < ehdr->e_phnum; ++i) {
2132 if (phdr[i].p_type == PT_LOAD) {
2133 abi_ulong a = phdr[i].p_vaddr - phdr[i].p_offset;
2134 if (a < loaddr) {
2135 loaddr = a;
2136 }
2137 a = phdr[i].p_vaddr + phdr[i].p_memsz;
2138 if (a > hiaddr) {
2139 hiaddr = a;
2140 }
2141 #ifdef CONFIG_USE_FDPIC
2142 ++info->nsegs;
2143 #endif
2144 }
2145 }
2146
2147 load_addr = loaddr;
2148 if (ehdr->e_type == ET_DYN) {
2149 /* The image indicates that it can be loaded anywhere. Find a
2150 location that can hold the memory space required. If the
2151 image is pre-linked, LOADDR will be non-zero. Since we do
2152 not supply MAP_FIXED here we'll use that address if and
2153 only if it remains available. */
2154 load_addr = target_mmap(loaddr, hiaddr - loaddr, PROT_NONE,
2155 MAP_PRIVATE | MAP_ANON | MAP_NORESERVE,
2156 -1, 0);
2157 if (load_addr == -1) {
2158 goto exit_perror;
2159 }
2160 } else if (pinterp_name != NULL) {
2161 /* This is the main executable. Make sure that the low
2162 address does not conflict with MMAP_MIN_ADDR or the
2163 QEMU application itself. */
2164 probe_guest_base(image_name, loaddr, hiaddr);
2165 }
2166 load_bias = load_addr - loaddr;
2167
2168 #ifdef CONFIG_USE_FDPIC
2169 {
2170 struct elf32_fdpic_loadseg *loadsegs = info->loadsegs =
2171 g_malloc(sizeof(*loadsegs) * info->nsegs);
2172
2173 for (i = 0; i < ehdr->e_phnum; ++i) {
2174 switch (phdr[i].p_type) {
2175 case PT_DYNAMIC:
2176 info->pt_dynamic_addr = phdr[i].p_vaddr + load_bias;
2177 break;
2178 case PT_LOAD:
2179 loadsegs->addr = phdr[i].p_vaddr + load_bias;
2180 loadsegs->p_vaddr = phdr[i].p_vaddr;
2181 loadsegs->p_memsz = phdr[i].p_memsz;
2182 ++loadsegs;
2183 break;
2184 }
2185 }
2186 }
2187 #endif
2188
2189 info->load_bias = load_bias;
2190 info->load_addr = load_addr;
2191 info->entry = ehdr->e_entry + load_bias;
2192 info->start_code = -1;
2193 info->end_code = 0;
2194 info->start_data = -1;
2195 info->end_data = 0;
2196 info->brk = 0;
2197 info->elf_flags = ehdr->e_flags;
2198
2199 for (i = 0; i < ehdr->e_phnum; i++) {
2200 struct elf_phdr *eppnt = phdr + i;
2201 if (eppnt->p_type == PT_LOAD) {
2202 abi_ulong vaddr, vaddr_po, vaddr_ps, vaddr_ef, vaddr_em;
2203 int elf_prot = 0;
2204
2205 if (eppnt->p_flags & PF_R) elf_prot = PROT_READ;
2206 if (eppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
2207 if (eppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
2208
2209 vaddr = load_bias + eppnt->p_vaddr;
2210 vaddr_po = TARGET_ELF_PAGEOFFSET(vaddr);
2211 vaddr_ps = TARGET_ELF_PAGESTART(vaddr);
2212
2213 error = target_mmap(vaddr_ps, eppnt->p_filesz + vaddr_po,
2214 elf_prot, MAP_PRIVATE | MAP_FIXED,
2215 image_fd, eppnt->p_offset - vaddr_po);
2216 if (error == -1) {
2217 goto exit_perror;
2218 }
2219
2220 vaddr_ef = vaddr + eppnt->p_filesz;
2221 vaddr_em = vaddr + eppnt->p_memsz;
2222
2223 /* If the load segment requests extra zeros (e.g. bss), map it. */
2224 if (vaddr_ef < vaddr_em) {
2225 zero_bss(vaddr_ef, vaddr_em, elf_prot);
2226 }
2227
2228 /* Find the full program boundaries. */
2229 if (elf_prot & PROT_EXEC) {
2230 if (vaddr < info->start_code) {
2231 info->start_code = vaddr;
2232 }
2233 if (vaddr_ef > info->end_code) {
2234 info->end_code = vaddr_ef;
2235 }
2236 }
2237 if (elf_prot & PROT_WRITE) {
2238 if (vaddr < info->start_data) {
2239 info->start_data = vaddr;
2240 }
2241 if (vaddr_ef > info->end_data) {
2242 info->end_data = vaddr_ef;
2243 }
2244 if (vaddr_em > info->brk) {
2245 info->brk = vaddr_em;
2246 }
2247 }
2248 } else if (eppnt->p_type == PT_INTERP && pinterp_name) {
2249 char *interp_name;
2250
2251 if (*pinterp_name) {
2252 errmsg = "Multiple PT_INTERP entries";
2253 goto exit_errmsg;
2254 }
2255 interp_name = malloc(eppnt->p_filesz);
2256 if (!interp_name) {
2257 goto exit_perror;
2258 }
2259
2260 if (eppnt->p_offset + eppnt->p_filesz <= BPRM_BUF_SIZE) {
2261 memcpy(interp_name, bprm_buf + eppnt->p_offset,
2262 eppnt->p_filesz);
2263 } else {
2264 retval = pread(image_fd, interp_name, eppnt->p_filesz,
2265 eppnt->p_offset);
2266 if (retval != eppnt->p_filesz) {
2267 goto exit_perror;
2268 }
2269 }
2270 if (interp_name[eppnt->p_filesz - 1] != 0) {
2271 errmsg = "Invalid PT_INTERP entry";
2272 goto exit_errmsg;
2273 }
2274 *pinterp_name = interp_name;
2275 }
2276 }
2277
2278 if (info->end_data == 0) {
2279 info->start_data = info->end_code;
2280 info->end_data = info->end_code;
2281 info->brk = info->end_code;
2282 }
2283
2284 if (qemu_log_enabled()) {
2285 load_symbols(ehdr, image_fd, load_bias);
2286 }
2287
2288 mmap_unlock();
2289
2290 close(image_fd);
2291 return;
2292
2293 exit_read:
2294 if (retval >= 0) {
2295 errmsg = "Incomplete read of file header";
2296 goto exit_errmsg;
2297 }
2298 exit_perror:
2299 errmsg = strerror(errno);
2300 exit_errmsg:
2301 fprintf(stderr, "%s: %s\n", image_name, errmsg);
2302 exit(-1);
2303 }
2304
2305 static void load_elf_interp(const char *filename, struct image_info *info,
2306 char bprm_buf[BPRM_BUF_SIZE])
2307 {
2308 int fd, retval;
2309
2310 fd = open(path(filename), O_RDONLY);
2311 if (fd < 0) {
2312 goto exit_perror;
2313 }
2314
2315 retval = read(fd, bprm_buf, BPRM_BUF_SIZE);
2316 if (retval < 0) {
2317 goto exit_perror;
2318 }
2319 if (retval < BPRM_BUF_SIZE) {
2320 memset(bprm_buf + retval, 0, BPRM_BUF_SIZE - retval);
2321 }
2322
2323 load_elf_image(filename, fd, info, NULL, bprm_buf);
2324 return;
2325
2326 exit_perror:
2327 fprintf(stderr, "%s: %s\n", filename, strerror(errno));
2328 exit(-1);
2329 }
2330
2331 static int symfind(const void *s0, const void *s1)
2332 {
2333 target_ulong addr = *(target_ulong *)s0;
2334 struct elf_sym *sym = (struct elf_sym *)s1;
2335 int result = 0;
2336 if (addr < sym->st_value) {
2337 result = -1;
2338 } else if (addr >= sym->st_value + sym->st_size) {
2339 result = 1;
2340 }
2341 return result;
2342 }
2343
2344 static const char *lookup_symbolxx(struct syminfo *s, target_ulong orig_addr)
2345 {
2346 #if ELF_CLASS == ELFCLASS32
2347 struct elf_sym *syms = s->disas_symtab.elf32;
2348 #else
2349 struct elf_sym *syms = s->disas_symtab.elf64;
2350 #endif
2351
2352 // binary search
2353 struct elf_sym *sym;
2354
2355 sym = bsearch(&orig_addr, syms, s->disas_num_syms, sizeof(*syms), symfind);
2356 if (sym != NULL) {
2357 return s->disas_strtab + sym->st_name;
2358 }
2359
2360 return "";
2361 }
2362
2363 /* FIXME: This should use elf_ops.h */
2364 static int symcmp(const void *s0, const void *s1)
2365 {
2366 struct elf_sym *sym0 = (struct elf_sym *)s0;
2367 struct elf_sym *sym1 = (struct elf_sym *)s1;
2368 return (sym0->st_value < sym1->st_value)
2369 ? -1
2370 : ((sym0->st_value > sym1->st_value) ? 1 : 0);
2371 }
2372
2373 /* Best attempt to load symbols from this ELF object. */
2374 static void load_symbols(struct elfhdr *hdr, int fd, abi_ulong load_bias)
2375 {
2376 int i, shnum, nsyms, sym_idx = 0, str_idx = 0;
2377 uint64_t segsz;
2378 struct elf_shdr *shdr;
2379 char *strings = NULL;
2380 struct syminfo *s = NULL;
2381 struct elf_sym *new_syms, *syms = NULL;
2382
2383 shnum = hdr->e_shnum;
2384 i = shnum * sizeof(struct elf_shdr);
2385 shdr = (struct elf_shdr *)alloca(i);
2386 if (pread(fd, shdr, i, hdr->e_shoff) != i) {
2387 return;
2388 }
2389
2390 bswap_shdr(shdr, shnum);
2391 for (i = 0; i < shnum; ++i) {
2392 if (shdr[i].sh_type == SHT_SYMTAB) {
2393 sym_idx = i;
2394 str_idx = shdr[i].sh_link;
2395 goto found;
2396 }
2397 }
2398
2399 /* There will be no symbol table if the file was stripped. */
2400 return;
2401
2402 found:
2403 /* Now know where the strtab and symtab are. Snarf them. */
2404 s = g_try_new(struct syminfo, 1);
2405 if (!s) {
2406 goto give_up;
2407 }
2408
2409 segsz = shdr[str_idx].sh_size;
2410 s->disas_strtab = strings = g_try_malloc(segsz);
2411 if (!strings ||
2412 pread(fd, strings, segsz, shdr[str_idx].sh_offset) != segsz) {
2413 goto give_up;
2414 }
2415
2416 segsz = shdr[sym_idx].sh_size;
2417 syms = g_try_malloc(segsz);
2418 if (!syms || pread(fd, syms, segsz, shdr[sym_idx].sh_offset) != segsz) {
2419 goto give_up;
2420 }
2421
2422 if (segsz / sizeof(struct elf_sym) > INT_MAX) {
2423 /* Implausibly large symbol table: give up rather than ploughing
2424 * on with the number of symbols calculation overflowing
2425 */
2426 goto give_up;
2427 }
2428 nsyms = segsz / sizeof(struct elf_sym);
2429 for (i = 0; i < nsyms; ) {
2430 bswap_sym(syms + i);
2431 /* Throw away entries which we do not need. */
2432 if (syms[i].st_shndx == SHN_UNDEF
2433 || syms[i].st_shndx >= SHN_LORESERVE
2434 || ELF_ST_TYPE(syms[i].st_info) != STT_FUNC) {
2435 if (i < --nsyms) {
2436 syms[i] = syms[nsyms];
2437 }
2438 } else {
2439 #if defined(TARGET_ARM) || defined (TARGET_MIPS)
2440 /* The bottom address bit marks a Thumb or MIPS16 symbol. */
2441 syms[i].st_value &= ~(target_ulong)1;
2442 #endif
2443 syms[i].st_value += load_bias;
2444 i++;
2445 }
2446 }
2447
2448 /* No "useful" symbol. */
2449 if (nsyms == 0) {
2450 goto give_up;
2451 }
2452
2453 /* Attempt to free the storage associated with the local symbols
2454 that we threw away. Whether or not this has any effect on the
2455 memory allocation depends on the malloc implementation and how
2456 many symbols we managed to discard. */
2457 new_syms = g_try_renew(struct elf_sym, syms, nsyms);
2458 if (new_syms == NULL) {
2459 goto give_up;
2460 }
2461 syms = new_syms;
2462
2463 qsort(syms, nsyms, sizeof(*syms), symcmp);
2464
2465 s->disas_num_syms = nsyms;
2466 #if ELF_CLASS == ELFCLASS32
2467 s->disas_symtab.elf32 = syms;
2468 #else
2469 s->disas_symtab.elf64 = syms;
2470 #endif
2471 s->lookup_symbol = lookup_symbolxx;
2472 s->next = syminfos;
2473 syminfos = s;
2474
2475 return;
2476
2477 give_up:
2478 g_free(s);
2479 g_free(strings);
2480 g_free(syms);
2481 }
2482
2483 uint32_t get_elf_eflags(int fd)
2484 {
2485 struct elfhdr ehdr;
2486 off_t offset;
2487 int ret;
2488
2489 /* Read ELF header */
2490 offset = lseek(fd, 0, SEEK_SET);
2491 if (offset == (off_t) -1) {
2492 return 0;
2493 }
2494 ret = read(fd, &ehdr, sizeof(ehdr));
2495 if (ret < sizeof(ehdr)) {
2496 return 0;
2497 }
2498 offset = lseek(fd, offset, SEEK_SET);
2499 if (offset == (off_t) -1) {
2500 return 0;
2501 }
2502
2503 /* Check ELF signature */
2504 if (!elf_check_ident(&ehdr)) {
2505 return 0;
2506 }
2507
2508 /* check header */
2509 bswap_ehdr(&ehdr);
2510 if (!elf_check_ehdr(&ehdr)) {
2511 return 0;
2512 }
2513
2514 /* return architecture id */
2515 return ehdr.e_flags;
2516 }
2517
2518 int load_elf_binary(struct linux_binprm *bprm, struct image_info *info)
2519 {
2520 struct image_info interp_info;
2521 struct elfhdr elf_ex;
2522 char *elf_interpreter = NULL;
2523 char *scratch;
2524
2525 info->start_mmap = (abi_ulong)ELF_START_MMAP;
2526
2527 load_elf_image(bprm->filename, bprm->fd, info,
2528 &elf_interpreter, bprm->buf);
2529
2530 /* ??? We need a copy of the elf header for passing to create_elf_tables.
2531 If we do nothing, we'll have overwritten this when we re-use bprm->buf
2532 when we load the interpreter. */
2533 elf_ex = *(struct elfhdr *)bprm->buf;
2534
2535 /* Do this so that we can load the interpreter, if need be. We will
2536 change some of these later */
2537 bprm->p = setup_arg_pages(bprm, info);
2538
2539 scratch = g_new0(char, TARGET_PAGE_SIZE);
2540 if (STACK_GROWS_DOWN) {
2541 bprm->p = copy_elf_strings(1, &bprm->filename, scratch,
2542 bprm->p, info->stack_limit);
2543 info->file_string = bprm->p;
2544 bprm->p = copy_elf_strings(bprm->envc, bprm->envp, scratch,
2545 bprm->p, info->stack_limit);
2546 info->env_strings = bprm->p;
2547 bprm->p = copy_elf_strings(bprm->argc, bprm->argv, scratch,
2548 bprm->p, info->stack_limit);
2549 info->arg_strings = bprm->p;
2550 } else {
2551 info->arg_strings = bprm->p;
2552 bprm->p = copy_elf_strings(bprm->argc, bprm->argv, scratch,
2553 bprm->p, info->stack_limit);
2554 info->env_strings = bprm->p;
2555 bprm->p = copy_elf_strings(bprm->envc, bprm->envp, scratch,
2556 bprm->p, info->stack_limit);
2557 info->file_string = bprm->p;
2558 bprm->p = copy_elf_strings(1, &bprm->filename, scratch,
2559 bprm->p, info->stack_limit);
2560 }
2561
2562 g_free(scratch);
2563
2564 if (!bprm->p) {
2565 fprintf(stderr, "%s: %s\n", bprm->filename, strerror(E2BIG));
2566 exit(-1);
2567 }
2568
2569 if (elf_interpreter) {
2570 load_elf_interp(elf_interpreter, &interp_info, bprm->buf);
2571
2572 /* If the program interpreter is one of these two, then assume
2573 an iBCS2 image. Otherwise assume a native linux image. */
2574
2575 if (strcmp(elf_interpreter, "/usr/lib/libc.so.1") == 0
2576 || strcmp(elf_interpreter, "/usr/lib/ld.so.1") == 0) {
2577 info->personality = PER_SVR4;
2578
2579 /* Why this, you ask??? Well SVr4 maps page 0 as read-only,
2580 and some applications "depend" upon this behavior. Since
2581 we do not have the power to recompile these, we emulate
2582 the SVr4 behavior. Sigh. */
2583 target_mmap(0, qemu_host_page_size, PROT_READ | PROT_EXEC,
2584 MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
2585 }
2586 }
2587
2588 bprm->p = create_elf_tables(bprm->p, bprm->argc, bprm->envc, &elf_ex,
2589 info, (elf_interpreter ? &interp_info : NULL));
2590 info->start_stack = bprm->p;
2591
2592 /* If we have an interpreter, set that as the program's entry point.
2593 Copy the load_bias as well, to help PPC64 interpret the entry
2594 point as a function descriptor. Do this after creating elf tables
2595 so that we copy the original program entry point into the AUXV. */
2596 if (elf_interpreter) {
2597 info->load_bias = interp_info.load_bias;
2598 info->entry = interp_info.entry;
2599 free(elf_interpreter);
2600 }
2601
2602 #ifdef USE_ELF_CORE_DUMP
2603 bprm->core_dump = &elf_core_dump;
2604 #endif
2605
2606 return 0;
2607 }
2608
2609 #ifdef USE_ELF_CORE_DUMP
2610 /*
2611 * Definitions to generate Intel SVR4-like core files.
2612 * These mostly have the same names as the SVR4 types with "target_elf_"
2613 * tacked on the front to prevent clashes with linux definitions,
2614 * and the typedef forms have been avoided. This is mostly like
2615 * the SVR4 structure, but more Linuxy, with things that Linux does
2616 * not support and which gdb doesn't really use excluded.
2617 *
2618 * Fields we don't dump (their contents is zero) in linux-user qemu
2619 * are marked with XXX.
2620 *
2621 * Core dump code is copied from linux kernel (fs/binfmt_elf.c).
2622 *
2623 * Porting ELF coredump for target is (quite) simple process. First you
2624 * define USE_ELF_CORE_DUMP in target ELF code (where init_thread() for
2625 * the target resides):
2626 *
2627 * #define USE_ELF_CORE_DUMP
2628 *
2629 * Next you define type of register set used for dumping. ELF specification
2630 * says that it needs to be array of elf_greg_t that has size of ELF_NREG.
2631 *
2632 * typedef <target_regtype> target_elf_greg_t;
2633 * #define ELF_NREG <number of registers>
2634 * typedef taret_elf_greg_t target_elf_gregset_t[ELF_NREG];
2635 *
2636 * Last step is to implement target specific function that copies registers
2637 * from given cpu into just specified register set. Prototype is:
2638 *
2639 * static void elf_core_copy_regs(taret_elf_gregset_t *regs,
2640 * const CPUArchState *env);
2641 *
2642 * Parameters:
2643 * regs - copy register values into here (allocated and zeroed by caller)
2644 * env - copy registers from here
2645 *
2646 * Example for ARM target is provided in this file.
2647 */
2648
2649 /* An ELF note in memory */
2650 struct memelfnote {
2651 const char *name;
2652 size_t namesz;
2653 size_t namesz_rounded;
2654 int type;
2655 size_t datasz;
2656 size_t datasz_rounded;
2657 void *data;
2658 size_t notesz;
2659 };
2660
2661 struct target_elf_siginfo {
2662 abi_int si_signo; /* signal number */
2663 abi_int si_code; /* extra code */
2664 abi_int si_errno; /* errno */
2665 };
2666
2667 struct target_elf_prstatus {
2668 struct target_elf_siginfo pr_info; /* Info associated with signal */
2669 abi_short pr_cursig; /* Current signal */
2670 abi_ulong pr_sigpend; /* XXX */
2671 abi_ulong pr_sighold; /* XXX */
2672 target_pid_t pr_pid;
2673 target_pid_t pr_ppid;
2674 target_pid_t pr_pgrp;
2675 target_pid_t pr_sid;
2676 struct target_timeval pr_utime; /* XXX User time */
2677 struct target_timeval pr_stime; /* XXX System time */
2678 struct target_timeval pr_cutime; /* XXX Cumulative user time */
2679 struct target_timeval pr_cstime; /* XXX Cumulative system time */
2680 target_elf_gregset_t pr_reg; /* GP registers */
2681 abi_int pr_fpvalid; /* XXX */
2682 };
2683
2684 #define ELF_PRARGSZ (80) /* Number of chars for args */
2685
2686 struct target_elf_prpsinfo {
2687 char pr_state; /* numeric process state */
2688 char pr_sname; /* char for pr_state */
2689 char pr_zomb; /* zombie */
2690 char pr_nice; /* nice val */
2691 abi_ulong pr_flag; /* flags */
2692 target_uid_t pr_uid;
2693 target_gid_t pr_gid;
2694 target_pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid;
2695 /* Lots missing */
2696 char pr_fname[16]; /* filename of executable */
2697 char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
2698 };
2699
2700 /* Here is the structure in which status of each thread is captured. */
2701 struct elf_thread_status {
2702 QTAILQ_ENTRY(elf_thread_status) ets_link;
2703 struct target_elf_prstatus prstatus; /* NT_PRSTATUS */
2704 #if 0
2705 elf_fpregset_t fpu; /* NT_PRFPREG */
2706 struct task_struct *thread;
2707 elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */
2708 #endif
2709 struct memelfnote notes[1];
2710 int num_notes;
2711 };
2712
2713 struct elf_note_info {
2714 struct memelfnote *notes;
2715 struct target_elf_prstatus *prstatus; /* NT_PRSTATUS */
2716 struct target_elf_prpsinfo *psinfo; /* NT_PRPSINFO */
2717
2718 QTAILQ_HEAD(thread_list_head, elf_thread_status) thread_list;
2719 #if 0
2720 /*
2721 * Current version of ELF coredump doesn't support
2722 * dumping fp regs etc.
2723 */
2724 elf_fpregset_t *fpu;
2725 elf_fpxregset_t *xfpu;
2726 int thread_status_size;
2727 #endif
2728 int notes_size;
2729 int numnote;
2730 };
2731
2732 struct vm_area_struct {
2733 target_ulong vma_start; /* start vaddr of memory region */
2734 target_ulong vma_end; /* end vaddr of memory region */
2735 abi_ulong vma_flags; /* protection etc. flags for the region */
2736 QTAILQ_ENTRY(vm_area_struct) vma_link;
2737 };
2738
2739 struct mm_struct {
2740 QTAILQ_HEAD(, vm_area_struct) mm_mmap;
2741 int mm_count; /* number of mappings */
2742 };
2743
2744 static struct mm_struct *vma_init(void);
2745 static void vma_delete(struct mm_struct *);
2746 static int vma_add_mapping(struct mm_struct *, target_ulong,
2747 target_ulong, abi_ulong);
2748 static int vma_get_mapping_count(const struct mm_struct *);
2749 static struct vm_area_struct *vma_first(const struct mm_struct *);
2750 static struct vm_area_struct *vma_next(struct vm_area_struct *);
2751 static abi_ulong vma_dump_size(const struct vm_area_struct *);
2752 static int vma_walker(void *priv, target_ulong start, target_ulong end,
2753 unsigned long flags);
2754
2755 static void fill_elf_header(struct elfhdr *, int, uint16_t, uint32_t);
2756 static void fill_note(struct memelfnote *, const char *, int,
2757 unsigned int, void *);
2758 static void fill_prstatus(struct target_elf_prstatus *, const TaskState *, int);
2759 static int fill_psinfo(struct target_elf_prpsinfo *, const TaskState *);
2760 static void fill_auxv_note(struct memelfnote *, const TaskState *);
2761 static void fill_elf_note_phdr(struct elf_phdr *, int, off_t);
2762 static size_t note_size(const struct memelfnote *);
2763 static void free_note_info(struct elf_note_info *);
2764 static int fill_note_info(struct elf_note_info *, long, const CPUArchState *);
2765 static void fill_thread_info(struct elf_note_info *, const CPUArchState *);
2766 static int core_dump_filename(const TaskState *, char *, size_t);
2767
2768 static int dump_write(int, const void *, size_t);
2769 static int write_note(struct memelfnote *, int);
2770 static int write_note_info(struct elf_note_info *, int);
2771
2772 #ifdef BSWAP_NEEDED
2773 static void bswap_prstatus(struct target_elf_prstatus *prstatus)
2774 {
2775 prstatus->pr_info.si_signo = tswap32(prstatus->pr_info.si_signo);
2776 prstatus->pr_info.si_code = tswap32(prstatus->pr_info.si_code);
2777 prstatus->pr_info.si_errno = tswap32(prstatus->pr_info.si_errno);
2778 prstatus->pr_cursig = tswap16(prstatus->pr_cursig);
2779 prstatus->pr_sigpend = tswapal(prstatus->pr_sigpend);
2780 prstatus->pr_sighold = tswapal(prstatus->pr_sighold);
2781 prstatus->pr_pid = tswap32(prstatus->pr_pid);
2782 prstatus->pr_ppid = tswap32(prstatus->pr_ppid);
2783 prstatus->pr_pgrp = tswap32(prstatus->pr_pgrp);
2784 prstatus->pr_sid = tswap32(prstatus->pr_sid);
2785 /* cpu times are not filled, so we skip them */
2786 /* regs should be in correct format already */
2787 prstatus->pr_fpvalid = tswap32(prstatus->pr_fpvalid);
2788 }
2789
2790 static void bswap_psinfo(struct target_elf_prpsinfo *psinfo)
2791 {
2792 psinfo->pr_flag = tswapal(psinfo->pr_flag);
2793 psinfo->pr_uid = tswap16(psinfo->pr_uid);
2794 psinfo->pr_gid = tswap16(psinfo->pr_gid);
2795 psinfo->pr_pid = tswap32(psinfo->pr_pid);
2796 psinfo->pr_ppid = tswap32(psinfo->pr_ppid);
2797 psinfo->pr_pgrp = tswap32(psinfo->pr_pgrp);
2798 psinfo->pr_sid = tswap32(psinfo->pr_sid);
2799 }
2800
2801 static void bswap_note(struct elf_note *en)
2802 {
2803 bswap32s(&en->n_namesz);
2804 bswap32s(&en->n_descsz);
2805 bswap32s(&en->n_type);
2806 }
2807 #else
2808 static inline void bswap_prstatus(struct target_elf_prstatus *p) { }
2809 static inline void bswap_psinfo(struct target_elf_prpsinfo *p) {}
2810 static inline void bswap_note(struct elf_note *en) { }
2811 #endif /* BSWAP_NEEDED */
2812
2813 /*
2814 * Minimal support for linux memory regions. These are needed
2815 * when we are finding out what memory exactly belongs to
2816 * emulated process. No locks needed here, as long as
2817 * thread that received the signal is stopped.
2818 */
2819
2820 static struct mm_struct *vma_init(void)
2821 {
2822 struct mm_struct *mm;
2823
2824 if ((mm = g_malloc(sizeof (*mm))) == NULL)
2825 return (NULL);
2826
2827 mm->mm_count = 0;
2828 QTAILQ_INIT(&mm->mm_mmap);
2829
2830 return (mm);
2831 }
2832
2833 static void vma_delete(struct mm_struct *mm)
2834 {
2835 struct vm_area_struct *vma;
2836
2837 while ((vma = vma_first(mm)) != NULL) {
2838 QTAILQ_REMOVE(&mm->mm_mmap, vma, vma_link);
2839 g_free(vma);
2840 }
2841 g_free(mm);
2842 }
2843
2844 static int vma_add_mapping(struct mm_struct *mm, target_ulong start,
2845 target_ulong end, abi_ulong flags)
2846 {
2847 struct vm_area_struct *vma;
2848
2849 if ((vma = g_malloc0(sizeof (*vma))) == NULL)
2850 return (-1);
2851
2852 vma->vma_start = start;
2853 vma->vma_end = end;
2854 vma->vma_flags = flags;
2855
2856 QTAILQ_INSERT_TAIL(&mm->mm_mmap, vma, vma_link);
2857 mm->mm_count++;
2858
2859 return (0);
2860 }
2861
2862 static struct vm_area_struct *vma_first(const struct mm_struct *mm)
2863 {
2864 return (QTAILQ_FIRST(&mm->mm_mmap));
2865 }
2866
2867 static struct vm_area_struct *vma_next(struct vm_area_struct *vma)
2868 {
2869 return (QTAILQ_NEXT(vma, vma_link));
2870 }
2871
2872 static int vma_get_mapping_count(const struct mm_struct *mm)
2873 {
2874 return (mm->mm_count);
2875 }
2876
2877 /*
2878 * Calculate file (dump) size of given memory region.
2879 */
2880 static abi_ulong vma_dump_size(const struct vm_area_struct *vma)
2881 {
2882 /* if we cannot even read the first page, skip it */
2883 if (!access_ok(VERIFY_READ, vma->vma_start, TARGET_PAGE_SIZE))
2884 return (0);
2885
2886 /*
2887 * Usually we don't dump executable pages as they contain
2888 * non-writable code that debugger can read directly from
2889 * target library etc. However, thread stacks are marked
2890 * also executable so we read in first page of given region
2891 * and check whether it contains elf header. If there is
2892 * no elf header, we dump it.
2893 */
2894 if (vma->vma_flags & PROT_EXEC) {
2895 char page[TARGET_PAGE_SIZE];
2896
2897 copy_from_user(page, vma->vma_start, sizeof (page));
2898 if ((page[EI_MAG0] == ELFMAG0) &&
2899 (page[EI_MAG1] == ELFMAG1) &&
2900 (page[EI_MAG2] == ELFMAG2) &&
2901 (page[EI_MAG3] == ELFMAG3)) {
2902 /*
2903 * Mappings are possibly from ELF binary. Don't dump
2904 * them.
2905 */
2906 return (0);
2907 }
2908 }
2909
2910 return (vma->vma_end - vma->vma_start);
2911 }
2912
2913 static int vma_walker(void *priv, target_ulong start, target_ulong end,
2914 unsigned long flags)
2915 {
2916 struct mm_struct *mm = (struct mm_struct *)priv;
2917
2918 vma_add_mapping(mm, start, end, flags);
2919 return (0);
2920 }
2921
2922 static void fill_note(struct memelfnote *note, const char *name, int type,
2923 unsigned int sz, void *data)
2924 {
2925 unsigned int namesz;
2926
2927 namesz = strlen(name) + 1;
2928 note->name = name;
2929 note->namesz = namesz;
2930 note->namesz_rounded = roundup(namesz, sizeof (int32_t));
2931 note->type = type;
2932 note->datasz = sz;
2933 note->datasz_rounded = roundup(sz, sizeof (int32_t));
2934
2935 note->data = data;
2936
2937 /*
2938 * We calculate rounded up note size here as specified by
2939 * ELF document.
2940 */
2941 note->notesz = sizeof (struct elf_note) +
2942 note->namesz_rounded + note->datasz_rounded;
2943 }
2944
2945 static void fill_elf_header(struct elfhdr *elf, int segs, uint16_t machine,
2946 uint32_t flags)
2947 {
2948 (void) memset(elf, 0, sizeof(*elf));
2949
2950 (void) memcpy(elf->e_ident, ELFMAG, SELFMAG);
2951 elf->e_ident[EI_CLASS] = ELF_CLASS;
2952 elf->e_ident[EI_DATA] = ELF_DATA;
2953 elf->e_ident[EI_VERSION] = EV_CURRENT;
2954 elf->e_ident[EI_OSABI] = ELF_OSABI;
2955
2956 elf->e_type = ET_CORE;
2957 elf->e_machine = machine;
2958 elf->e_version = EV_CURRENT;
2959 elf->e_phoff = sizeof(struct elfhdr);
2960 elf->e_flags = flags;
2961 elf->e_ehsize = sizeof(struct elfhdr);
2962 elf->e_phentsize = sizeof(struct elf_phdr);
2963 elf->e_phnum = segs;
2964
2965 bswap_ehdr(elf);
2966 }
2967
2968 static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, off_t offset)
2969 {
2970 phdr->p_type = PT_NOTE;
2971 phdr->p_offset = offset;
2972 phdr->p_vaddr = 0;
2973 phdr->p_paddr = 0;
2974 phdr->p_filesz = sz;
2975 phdr->p_memsz = 0;
2976 phdr->p_flags = 0;
2977 phdr->p_align = 0;
2978
2979 bswap_phdr(phdr, 1);
2980 }
2981
2982 static size_t note_size(const struct memelfnote *note)
2983 {
2984 return (note->notesz);
2985 }
2986
2987 static void fill_prstatus(struct target_elf_prstatus *prstatus,
2988 const TaskState *ts, int signr)
2989 {
2990 (void) memset(prstatus, 0, sizeof (*prstatus));
2991 prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
2992 prstatus->pr_pid = ts->ts_tid;
2993 prstatus->pr_ppid = getppid();
2994 prstatus->pr_pgrp = getpgrp();
2995 prstatus->pr_sid = getsid(0);
2996
2997 bswap_prstatus(prstatus);
2998 }
2999
3000 static int fill_psinfo(struct target_elf_prpsinfo *psinfo, const TaskState *ts)
3001 {
3002 char *base_filename;
3003 unsigned int i, len;
3004
3005 (void) memset(psinfo, 0, sizeof (*psinfo));
3006
3007 len = ts->info->arg_end - ts->info->arg_start;
3008 if (len >= ELF_PRARGSZ)
3009 len = ELF_PRARGSZ - 1;
3010 if (copy_from_user(&psinfo->pr_psargs, ts->info->arg_start, len))
3011 return -EFAULT;
3012 for (i = 0; i < len; i++)
3013 if (psinfo->pr_psargs[i] == 0)
3014 psinfo->pr_psargs[i] = ' ';
3015 psinfo->pr_psargs[len] = 0;
3016
3017 psinfo->pr_pid = getpid();
3018 psinfo->pr_ppid = getppid();
3019 psinfo->pr_pgrp = getpgrp();
3020 psinfo->pr_sid = getsid(0);
3021 psinfo->pr_uid = getuid();
3022 psinfo->pr_gid = getgid();
3023
3024 base_filename = g_path_get_basename(ts->bprm->filename);
3025 /*
3026 * Using strncpy here is fine: at max-length,
3027 * this field is not NUL-terminated.
3028 */
3029 (void) strncpy(psinfo->pr_fname, base_filename,
3030 sizeof(psinfo->pr_fname));
3031
3032 g_free(base_filename);
3033 bswap_psinfo(psinfo);
3034 return (0);
3035 }
3036
3037 static void fill_auxv_note(struct memelfnote *note, const TaskState *ts)
3038 {
3039 elf_addr_t auxv = (elf_addr_t)ts->info->saved_auxv;
3040 elf_addr_t orig_auxv = auxv;
3041 void *ptr;
3042 int len = ts->info->auxv_len;
3043
3044 /*
3045 * Auxiliary vector is stored in target process stack. It contains
3046 * {type, value} pairs that we need to dump into note. This is not
3047 * strictly necessary but we do it here for sake of completeness.
3048 */
3049
3050 /* read in whole auxv vector and copy it to memelfnote */
3051 ptr = lock_user(VERIFY_READ, orig_auxv, len, 0);
3052 if (ptr != NULL) {
3053 fill_note(note, "CORE", NT_AUXV, len, ptr);
3054 unlock_user(ptr, auxv, len);
3055 }
3056 }
3057
3058 /*
3059 * Constructs name of coredump file. We have following convention
3060 * for the name:
3061 * qemu_<basename-of-target-binary>_<date>-<time>_<pid>.core
3062 *
3063 * Returns 0 in case of success, -1 otherwise (errno is set).
3064 */
3065 static int core_dump_filename(const TaskState *ts, char *buf,
3066 size_t bufsize)
3067 {
3068 char timestamp[64];
3069 char *base_filename = NULL;
3070 struct timeval tv;
3071 struct tm tm;
3072
3073 assert(bufsize >= PATH_MAX);
3074
3075 if (gettimeofday(&tv, NULL) < 0) {
3076 (void) fprintf(stderr, "unable to get current timestamp: %s",
3077 strerror(errno));
3078 return (-1);
3079 }
3080
3081 base_filename = g_path_get_basename(ts->bprm->filename);
3082 (void) strftime(timestamp, sizeof (timestamp), "%Y%m%d-%H%M%S",
3083 localtime_r(&tv.tv_sec, &tm));
3084 (void) snprintf(buf, bufsize, "qemu_%s_%s_%d.core",
3085 base_filename, timestamp, (int)getpid());
3086 g_free(base_filename);
3087
3088 return (0);
3089 }
3090
3091 static int dump_write(int fd, const void *ptr, size_t size)
3092 {
3093 const char *bufp = (const char *)ptr;
3094 ssize_t bytes_written, bytes_left;
3095 struct rlimit dumpsize;
3096 off_t pos;
3097
3098 bytes_written = 0;
3099 getrlimit(RLIMIT_CORE, &dumpsize);
3100 if ((pos = lseek(fd, 0, SEEK_CUR))==-1) {
3101 if (errno == ESPIPE) { /* not a seekable stream */
3102 bytes_left = size;
3103 } else {
3104 return pos;
3105 }
3106 } else {
3107 if (dumpsize.rlim_cur <= pos) {
3108 return -1;
3109 } else if (dumpsize.rlim_cur == RLIM_INFINITY) {
3110 bytes_left = size;
3111 } else {
3112 size_t limit_left=dumpsize.rlim_cur - pos;
3113 bytes_left = limit_left >= size ? size : limit_left ;
3114 }
3115 }
3116
3117 /*
3118 * In normal conditions, single write(2) should do but
3119 * in case of socket etc. this mechanism is more portable.
3120 */
3121 do {
3122 bytes_written = write(fd, bufp, bytes_left);
3123 if (bytes_written < 0) {
3124 if (errno == EINTR)
3125 continue;
3126 return (-1);
3127 } else if (bytes_written == 0) { /* eof */
3128 return (-1);
3129 }
3130 bufp += bytes_written;
3131 bytes_left -= bytes_written;
3132 } while (bytes_left > 0);
3133
3134 return (0);
3135 }
3136
3137 static int write_note(struct memelfnote *men, int fd)
3138 {
3139 struct elf_note en;
3140
3141 en.n_namesz = men->namesz;
3142 en.n_type = men->type;
3143 en.n_descsz = men->datasz;
3144
3145 bswap_note(&en);
3146
3147 if (dump_write(fd, &en, sizeof(en)) != 0)
3148 return (-1);
3149 if (dump_write(fd, men->name, men->namesz_rounded) != 0)
3150 return (-1);
3151 if (dump_write(fd, men->data, men->datasz_rounded) != 0)
3152 return (-1);
3153
3154 return (0);
3155 }
3156
3157 static void fill_thread_info(struct elf_note_info *info, const CPUArchState *env)
3158 {
3159 CPUState *cpu = ENV_GET_CPU((CPUArchState *)env);
3160 TaskState *ts = (TaskState *)cpu->opaque;
3161 struct elf_thread_status *ets;
3162
3163 ets = g_malloc0(sizeof (*ets));
3164 ets->num_notes = 1; /* only prstatus is dumped */
3165 fill_prstatus(&ets->prstatus, ts, 0);
3166 elf_core_copy_regs(&ets->prstatus.pr_reg, env);
3167 fill_note(&ets->notes[0], "CORE", NT_PRSTATUS, sizeof (ets->prstatus),
3168 &ets->prstatus);
3169
3170 QTAILQ_INSERT_TAIL(&info->thread_list, ets, ets_link);
3171
3172 info->notes_size += note_size(&ets->notes[0]);
3173 }
3174
3175 static void init_note_info(struct elf_note_info *info)
3176 {
3177 /* Initialize the elf_note_info structure so that it is at
3178 * least safe to call free_note_info() on it. Must be
3179 * called before calling fill_note_info().
3180 */
3181 memset(info, 0, sizeof (*info));
3182 QTAILQ_INIT(&info->thread_list);
3183 }
3184
3185 static int fill_note_info(struct elf_note_info *info,
3186 long signr, const CPUArchState *env)
3187 {
3188 #define NUMNOTES 3
3189 CPUState *cpu = ENV_GET_CPU((CPUArchState *)env);
3190 TaskState *ts = (TaskState *)cpu->opaque;
3191 int i;
3192
3193 info->notes = g_new0(struct memelfnote, NUMNOTES);
3194 if (info->notes == NULL)
3195 return (-ENOMEM);
3196 info->prstatus = g_malloc0(sizeof (*info->prstatus));
3197 if (info->prstatus == NULL)
3198 return (-ENOMEM);
3199 info->psinfo = g_malloc0(sizeof (*info->psinfo));
3200 if (info->prstatus == NULL)
3201 return (-ENOMEM);
3202
3203 /*
3204 * First fill in status (and registers) of current thread
3205 * including process info & aux vector.
3206 */
3207 fill_prstatus(info->prstatus, ts, signr);
3208 elf_core_copy_regs(&info->prstatus->pr_reg, env);
3209 fill_note(&info->notes[0], "CORE", NT_PRSTATUS,
3210 sizeof (*info->prstatus), info->prstatus);
3211 fill_psinfo(info->psinfo, ts);
3212 fill_note(&info->notes[1], "CORE", NT_PRPSINFO,
3213 sizeof (*info->psinfo), info->psinfo);
3214 fill_auxv_note(&info->notes[2], ts);
3215 info->numnote = 3;
3216
3217 info->notes_size = 0;
3218 for (i = 0; i < info->numnote; i++)
3219 info->notes_size += note_size(&info->notes[i]);
3220
3221 /* read and fill status of all threads */
3222 cpu_list_lock();
3223 CPU_FOREACH(cpu) {
3224 if (cpu == thread_cpu) {
3225 continue;
3226 }
3227 fill_thread_info(info, (CPUArchState *)cpu->env_ptr);
3228 }
3229 cpu_list_unlock();
3230
3231 return (0);
3232 }
3233
3234 static void free_note_info(struct elf_note_info *info)
3235 {
3236 struct elf_thread_status *ets;
3237
3238 while (!QTAILQ_EMPTY(&info->thread_list)) {
3239 ets = QTAILQ_FIRST(&info->thread_list);
3240 QTAILQ_REMOVE(&info->thread_list, ets, ets_link);
3241 g_free(ets);
3242 }
3243
3244 g_free(info->prstatus);
3245 g_free(info->psinfo);
3246 g_free(info->notes);
3247 }
3248
3249 static int write_note_info(struct elf_note_info *info, int fd)
3250 {
3251 struct elf_thread_status *ets;
3252 int i, error = 0;
3253
3254 /* write prstatus, psinfo and auxv for current thread */
3255 for (i = 0; i < info->numnote; i++)
3256 if ((error = write_note(&info->notes[i], fd)) != 0)
3257 return (error);
3258
3259 /* write prstatus for each thread */
3260 QTAILQ_FOREACH(ets, &info->thread_list, ets_link) {
3261 if ((error = write_note(&ets->notes[0], fd)) != 0)
3262 return (error);
3263 }
3264
3265 return (0);
3266 }
3267
3268 /*
3269 * Write out ELF coredump.
3270 *
3271 * See documentation of ELF object file format in:
3272 * http://www.caldera.com/developers/devspecs/gabi41.pdf
3273 *
3274 * Coredump format in linux is following:
3275 *
3276 * 0 +----------------------+ \
3277 * | ELF header | ET_CORE |
3278 * +----------------------+ |
3279 * | ELF program headers | |--- headers
3280 * | - NOTE section | |
3281 * | - PT_LOAD sections | |
3282 * +----------------------+ /
3283 * | NOTEs: |
3284 * | - NT_PRSTATUS |
3285 * | - NT_PRSINFO |
3286 * | - NT_AUXV |
3287 * +----------------------+ <-- aligned to target page
3288 * | Process memory dump |
3289 * : :
3290 * . .
3291 * : :
3292 * | |
3293 * +----------------------+
3294 *
3295 * NT_PRSTATUS -> struct elf_prstatus (per thread)
3296 * NT_PRSINFO -> struct elf_prpsinfo
3297 * NT_AUXV is array of { type, value } pairs (see fill_auxv_note()).
3298 *
3299 * Format follows System V format as close as possible. Current
3300 * version limitations are as follows:
3301 * - no floating point registers are dumped
3302 *
3303 * Function returns 0 in case of success, negative errno otherwise.
3304 *
3305 * TODO: make this work also during runtime: it should be
3306 * possible to force coredump from running process and then
3307 * continue processing. For example qemu could set up SIGUSR2
3308 * handler (provided that target process haven't registered
3309 * handler for that) that does the dump when signal is received.
3310 */
3311 static int elf_core_dump(int signr, const CPUArchState *env)
3312 {
3313 const CPUState *cpu = ENV_GET_CPU((CPUArchState *)env);
3314 const TaskState *ts = (const TaskState *)cpu->opaque;
3315 struct vm_area_struct *vma = NULL;
3316 char corefile[PATH_MAX];
3317 struct elf_note_info info;
3318 struct elfhdr elf;
3319 struct elf_phdr phdr;
3320 struct rlimit dumpsize;
3321 struct mm_struct *mm = NULL;
3322 off_t offset = 0, data_offset = 0;
3323 int segs = 0;
3324 int fd = -1;
3325
3326 init_note_info(&info);
3327
3328 errno = 0;
3329 getrlimit(RLIMIT_CORE, &dumpsize);
3330 if (dumpsize.rlim_cur == 0)
3331 return 0;
3332
3333 if (core_dump_filename(ts, corefile, sizeof (corefile)) < 0)
3334 return (-errno);
3335
3336 if ((fd = open(corefile, O_WRONLY | O_CREAT,
3337 S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)) < 0)
3338 return (-errno);
3339
3340 /*
3341 * Walk through target process memory mappings and
3342 * set up structure containing this information. After
3343 * this point vma_xxx functions can be used.
3344 */
3345 if ((mm = vma_init()) == NULL)
3346 goto out;
3347
3348 walk_memory_regions(mm, vma_walker);
3349 segs = vma_get_mapping_count(mm);
3350
3351 /*
3352 * Construct valid coredump ELF header. We also
3353 * add one more segment for notes.
3354 */
3355 fill_elf_header(&elf, segs + 1, ELF_MACHINE, 0);
3356 if (dump_write(fd, &elf, sizeof (elf)) != 0)
3357 goto out;
3358
3359 /* fill in the in-memory version of notes */
3360 if (fill_note_info(&info, signr, env) < 0)
3361 goto out;
3362
3363 offset += sizeof (elf); /* elf header */
3364 offset += (segs + 1) * sizeof (struct elf_phdr); /* program headers */
3365
3366 /* write out notes program header */
3367 fill_elf_note_phdr(&phdr, info.notes_size, offset);
3368
3369 offset += info.notes_size;
3370 if (dump_write(fd, &phdr, sizeof (phdr)) != 0)
3371 goto out;
3372
3373 /*
3374 * ELF specification wants data to start at page boundary so
3375 * we align it here.
3376 */
3377 data_offset = offset = roundup(offset, ELF_EXEC_PAGESIZE);
3378
3379 /*
3380 * Write program headers for memory regions mapped in
3381 * the target process.
3382 */
3383 for (vma = vma_first(mm); vma != NULL; vma = vma_next(vma)) {
3384 (void) memset(&phdr, 0, sizeof (phdr));
3385
3386 phdr.p_type = PT_LOAD;
3387 phdr.p_offset = offset;
3388 phdr.p_vaddr = vma->vma_start;
3389 phdr.p_paddr = 0;
3390 phdr.p_filesz = vma_dump_size(vma);
3391 offset += phdr.p_filesz;
3392 phdr.p_memsz = vma->vma_end - vma->vma_start;
3393 phdr.p_flags = vma->vma_flags & PROT_READ ? PF_R : 0;
3394 if (vma->vma_flags & PROT_WRITE)
3395 phdr.p_flags |= PF_W;
3396 if (vma->vma_flags & PROT_EXEC)
3397 phdr.p_flags |= PF_X;
3398 phdr.p_align = ELF_EXEC_PAGESIZE;
3399
3400 bswap_phdr(&phdr, 1);
3401 if (dump_write(fd, &phdr, sizeof(phdr)) != 0) {
3402 goto out;
3403 }
3404 }
3405
3406 /*
3407 * Next we write notes just after program headers. No
3408 * alignment needed here.
3409 */
3410 if (write_note_info(&info, fd) < 0)
3411 goto out;
3412
3413 /* align data to page boundary */
3414 if (lseek(fd, data_offset, SEEK_SET) != data_offset)
3415 goto out;
3416
3417 /*
3418 * Finally we can dump process memory into corefile as well.
3419 */
3420 for (vma = vma_first(mm); vma != NULL; vma = vma_next(vma)) {
3421 abi_ulong addr;
3422 abi_ulong end;
3423
3424 end = vma->vma_start + vma_dump_size(vma);
3425
3426 for (addr = vma->vma_start; addr < end;
3427 addr += TARGET_PAGE_SIZE) {
3428 char page[TARGET_PAGE_SIZE];
3429 int error;
3430
3431 /*
3432 * Read in page from target process memory and
3433 * write it to coredump file.
3434 */
3435 error = copy_from_user(page, addr, sizeof (page));
3436 if (error != 0) {
3437 (void) fprintf(stderr, "unable to dump " TARGET_ABI_FMT_lx "\n",
3438 addr);
3439 errno = -error;
3440 goto out;
3441 }
3442 if (dump_write(fd, page, TARGET_PAGE_SIZE) < 0)
3443 goto out;
3444 }
3445 }
3446
3447 out:
3448 free_note_info(&info);
3449 if (mm != NULL)
3450 vma_delete(mm);
3451 (void) close(fd);
3452
3453 if (errno != 0)
3454 return (-errno);
3455 return (0);
3456 }
3457 #endif /* USE_ELF_CORE_DUMP */
3458
3459 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop)
3460 {
3461 init_thread(regs, infop);
3462 }
QEmu