1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Much of this is taken from binutils and GNU libc ...
7 */
8 #ifndef _ASM_ELF_H
9 #define _ASM_ELF_H
10
11 #include <linux/auxvec.h>
12 #include <linux/fs.h>
13 #include <linux/mm_types.h>
14
15 #include <uapi/linux/elf.h>
16
17 #include <asm/current.h>
18
19 /* ELF header e_flags defines. */
20 /* MIPS architecture level. */
21 #define EF_MIPS_ARCH_1 0x00000000 /* -mips1 code. */
22 #define EF_MIPS_ARCH_2 0x10000000 /* -mips2 code. */
23 #define EF_MIPS_ARCH_3 0x20000000 /* -mips3 code. */
24 #define EF_MIPS_ARCH_4 0x30000000 /* -mips4 code. */
25 #define EF_MIPS_ARCH_5 0x40000000 /* -mips5 code. */
26 #define EF_MIPS_ARCH_32 0x50000000 /* MIPS32 code. */
27 #define EF_MIPS_ARCH_64 0x60000000 /* MIPS64 code. */
28 #define EF_MIPS_ARCH_32R2 0x70000000 /* MIPS32 R2 code. */
29 #define EF_MIPS_ARCH_64R2 0x80000000 /* MIPS64 R2 code. */
30
31 /* The ABI of a file. */
32 #define EF_MIPS_ABI_O32 0x00001000 /* O32 ABI. */
33 #define EF_MIPS_ABI_O64 0x00002000 /* O32 extended for 64 bit. */
34
35 #define PT_MIPS_REGINFO 0x70000000
36 #define PT_MIPS_RTPROC 0x70000001
37 #define PT_MIPS_OPTIONS 0x70000002
38 #define PT_MIPS_ABIFLAGS 0x70000003
39
40 /* Flags in the e_flags field of the header */
41 #define EF_MIPS_NOREORDER 0x00000001
42 #define EF_MIPS_PIC 0x00000002
43 #define EF_MIPS_CPIC 0x00000004
44 #define EF_MIPS_ABI2 0x00000020
45 #define EF_MIPS_OPTIONS_FIRST 0x00000080
46 #define EF_MIPS_32BITMODE 0x00000100
47 #define EF_MIPS_FP64 0x00000200
48 #define EF_MIPS_NAN2008 0x00000400
49 #define EF_MIPS_ABI 0x0000f000
50 #define EF_MIPS_ARCH 0xf0000000
51
52 #define DT_MIPS_RLD_VERSION 0x70000001
53 #define DT_MIPS_TIME_STAMP 0x70000002
54 #define DT_MIPS_ICHECKSUM 0x70000003
55 #define DT_MIPS_IVERSION 0x70000004
56 #define DT_MIPS_FLAGS 0x70000005
57 #define RHF_NONE 0x00000000
58 #define RHF_HARDWAY 0x00000001
59 #define RHF_NOTPOT 0x00000002
60 #define RHF_SGI_ONLY 0x00000010
61 #define DT_MIPS_BASE_ADDRESS 0x70000006
62 #define DT_MIPS_CONFLICT 0x70000008
63 #define DT_MIPS_LIBLIST 0x70000009
64 #define DT_MIPS_LOCAL_GOTNO 0x7000000a
65 #define DT_MIPS_CONFLICTNO 0x7000000b
66 #define DT_MIPS_LIBLISTNO 0x70000010
67 #define DT_MIPS_SYMTABNO 0x70000011
68 #define DT_MIPS_UNREFEXTNO 0x70000012
69 #define DT_MIPS_GOTSYM 0x70000013
70 #define DT_MIPS_HIPAGENO 0x70000014
71 #define DT_MIPS_RLD_MAP 0x70000016
72
73 #define R_MIPS_NONE 0
74 #define R_MIPS_16 1
75 #define R_MIPS_32 2
76 #define R_MIPS_REL32 3
77 #define R_MIPS_26 4
78 #define R_MIPS_HI16 5
79 #define R_MIPS_LO16 6
80 #define R_MIPS_GPREL16 7
81 #define R_MIPS_LITERAL 8
82 #define R_MIPS_GOT16 9
83 #define R_MIPS_PC16 10
84 #define R_MIPS_CALL16 11
85 #define R_MIPS_GPREL32 12
86 /* The remaining relocs are defined on Irix, although they are not
87 in the MIPS ELF ABI. */
88 #define R_MIPS_UNUSED1 13
89 #define R_MIPS_UNUSED2 14
90 #define R_MIPS_UNUSED3 15
91 #define R_MIPS_SHIFT5 16
92 #define R_MIPS_SHIFT6 17
93 #define R_MIPS_64 18
94 #define R_MIPS_GOT_DISP 19
95 #define R_MIPS_GOT_PAGE 20
96 #define R_MIPS_GOT_OFST 21
97 /*
98 * The following two relocation types are specified in the MIPS ABI
99 * conformance guide version 1.2 but not yet in the psABI.
100 */
101 #define R_MIPS_GOTHI16 22
102 #define R_MIPS_GOTLO16 23
103 #define R_MIPS_SUB 24
104 #define R_MIPS_INSERT_A 25
105 #define R_MIPS_INSERT_B 26
106 #define R_MIPS_DELETE 27
107 #define R_MIPS_HIGHER 28
108 #define R_MIPS_HIGHEST 29
109 /*
110 * The following two relocation types are specified in the MIPS ABI
111 * conformance guide version 1.2 but not yet in the psABI.
112 */
113 #define R_MIPS_CALLHI16 30
114 #define R_MIPS_CALLLO16 31
115 /*
116 * Introduced for MIPSr6.
117 */
118 #define R_MIPS_PC21_S2 60
119 #define R_MIPS_PC26_S2 61
120 /*
121 * This range is reserved for vendor specific relocations.
122 */
123 #define R_MIPS_LOVENDOR 100
124 #define R_MIPS_HIVENDOR 127
125
126 #define SHN_MIPS_ACCOMON 0xff00 /* Allocated common symbols */
127 #define SHN_MIPS_TEXT 0xff01 /* Allocated test symbols. */
128 #define SHN_MIPS_DATA 0xff02 /* Allocated data symbols. */
129 #define SHN_MIPS_SCOMMON 0xff03 /* Small common symbols */
130 #define SHN_MIPS_SUNDEFINED 0xff04 /* Small undefined symbols */
131
132 #define SHT_MIPS_LIST 0x70000000
133 #define SHT_MIPS_CONFLICT 0x70000002
134 #define SHT_MIPS_GPTAB 0x70000003
135 #define SHT_MIPS_UCODE 0x70000004
136 #define SHT_MIPS_DEBUG 0x70000005
137 #define SHT_MIPS_REGINFO 0x70000006
138 #define SHT_MIPS_PACKAGE 0x70000007
139 #define SHT_MIPS_PACKSYM 0x70000008
140 #define SHT_MIPS_RELD 0x70000009
141 #define SHT_MIPS_IFACE 0x7000000b
142 #define SHT_MIPS_CONTENT 0x7000000c
143 #define SHT_MIPS_OPTIONS 0x7000000d
144 #define SHT_MIPS_SHDR 0x70000010
145 #define SHT_MIPS_FDESC 0x70000011
146 #define SHT_MIPS_EXTSYM 0x70000012
147 #define SHT_MIPS_DENSE 0x70000013
148 #define SHT_MIPS_PDESC 0x70000014
149 #define SHT_MIPS_LOCSYM 0x70000015
150 #define SHT_MIPS_AUXSYM 0x70000016
151 #define SHT_MIPS_OPTSYM 0x70000017
152 #define SHT_MIPS_LOCSTR 0x70000018
153 #define SHT_MIPS_LINE 0x70000019
154 #define SHT_MIPS_RFDESC 0x7000001a
155 #define SHT_MIPS_DELTASYM 0x7000001b
156 #define SHT_MIPS_DELTAINST 0x7000001c
157 #define SHT_MIPS_DELTACLASS 0x7000001d
158 #define SHT_MIPS_DWARF 0x7000001e
159 #define SHT_MIPS_DELTADECL 0x7000001f
160 #define SHT_MIPS_SYMBOL_LIB 0x70000020
161 #define SHT_MIPS_EVENTS 0x70000021
162 #define SHT_MIPS_TRANSLATE 0x70000022
163 #define SHT_MIPS_PIXIE 0x70000023
164 #define SHT_MIPS_XLATE 0x70000024
165 #define SHT_MIPS_XLATE_DEBUG 0x70000025
166 #define SHT_MIPS_WHIRL 0x70000026
167 #define SHT_MIPS_EH_REGION 0x70000027
168 #define SHT_MIPS_XLATE_OLD 0x70000028
169 #define SHT_MIPS_PDR_EXCEPTION 0x70000029
170
171 #define SHF_MIPS_GPREL 0x10000000
172 #define SHF_MIPS_MERGE 0x20000000
173 #define SHF_MIPS_ADDR 0x40000000
174 #define SHF_MIPS_STRING 0x80000000
175 #define SHF_MIPS_NOSTRIP 0x08000000
176 #define SHF_MIPS_LOCAL 0x04000000
177 #define SHF_MIPS_NAMES 0x02000000
178 #define SHF_MIPS_NODUPES 0x01000000
179
180 #define MIPS_ABI_FP_ANY 0 /* FP ABI doesn't matter */
181 #define MIPS_ABI_FP_DOUBLE 1 /* -mdouble-float */
182 #define MIPS_ABI_FP_SINGLE 2 /* -msingle-float */
183 #define MIPS_ABI_FP_SOFT 3 /* -msoft-float */
184 #define MIPS_ABI_FP_OLD_64 4 /* -mips32r2 -mfp64 */
185 #define MIPS_ABI_FP_XX 5 /* -mfpxx */
186 #define MIPS_ABI_FP_64 6 /* -mips32r2 -mfp64 */
187 #define MIPS_ABI_FP_64A 7 /* -mips32r2 -mfp64 -mno-odd-spreg */
188
189 struct mips_elf_abiflags_v0 {
190 uint16_t version; /* Version of flags structure */
191 uint8_t isa_level; /* The level of the ISA: 1-5, 32, 64 */
192 uint8_t isa_rev; /* The revision of ISA: 0 for MIPS V and below,
193 1-n otherwise */
194 uint8_t gpr_size; /* The size of general purpose registers */
195 uint8_t cpr1_size; /* The size of co-processor 1 registers */
196 uint8_t cpr2_size; /* The size of co-processor 2 registers */
197 uint8_t fp_abi; /* The floating-point ABI */
198 uint32_t isa_ext; /* Mask of processor-specific extensions */
199 uint32_t ases; /* Mask of ASEs used */
200 uint32_t flags1; /* Mask of general flags */
201 uint32_t flags2;
202 };
203
204 /* ELF register definitions */
205 #define ELF_NGREG 45
206 #define ELF_NFPREG 33
207
208 typedef unsigned long elf_greg_t;
209 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
210
211 typedef double elf_fpreg_t;
212 typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
213
214 void mips_dump_regs32(u32 *uregs, const struct pt_regs *regs);
215 void mips_dump_regs64(u64 *uregs, const struct pt_regs *regs);
216
217 #ifdef CONFIG_32BIT
218 /*
219 * This is used to ensure we don't load something for the wrong architecture.
220 */
221 #define elf_check_arch elf32_check_arch
222
223 /*
224 * These are used to set parameters in the core dumps.
225 */
226 #define ELF_CLASS ELFCLASS32
227
228 #define ELF_CORE_COPY_REGS(dest, regs) \
229 mips_dump_regs32((u32 *)&(dest), (regs));
230
231 #endif /* CONFIG_32BIT */
232
233 #ifdef CONFIG_64BIT
234 /*
235 * This is used to ensure we don't load something for the wrong architecture.
236 */
237 #define elf_check_arch elf64_check_arch
238 #define compat_elf_check_arch elf32_check_arch
239
240 /*
241 * These are used to set parameters in the core dumps.
242 */
243 #define ELF_CLASS ELFCLASS64
244
245 #define ELF_CORE_COPY_REGS(dest, regs) \
246 mips_dump_regs64((u64 *)&(dest), (regs));
247
248 #endif /* CONFIG_64BIT */
249
250 /*
251 * These are used to set parameters in the core dumps.
252 */
253 #ifdef __MIPSEB__
254 #define ELF_DATA ELFDATA2MSB
255 #elif defined(__MIPSEL__)
256 #define ELF_DATA ELFDATA2LSB
257 #endif
258 #define ELF_ARCH EM_MIPS
259
260 /*
261 * In order to be sure that we don't attempt to execute an O32 binary which
262 * requires 64 bit FP (FR=1) on a system which does not support it we refuse
263 * to execute any binary which has bits specified by the following macro set
264 * in its ELF header flags.
265 */
266 #ifdef CONFIG_MIPS_O32_FP64_SUPPORT
267 # define __MIPS_O32_FP64_MUST_BE_ZERO 0
268 #else
269 # define __MIPS_O32_FP64_MUST_BE_ZERO EF_MIPS_FP64
270 #endif
271
272 #define mips_elf_check_machine(x) ((x)->e_machine == EM_MIPS)
273
274 #define vmcore_elf32_check_arch mips_elf_check_machine
275 #define vmcore_elf64_check_arch mips_elf_check_machine
276
277 /*
278 * Return non-zero if HDR identifies an o32 or n32 ELF binary.
279 */
280 #define elf32_check_arch(hdr) \
281 ({ \
282 int __res = 1; \
283 struct elfhdr *__h = (hdr); \
284 \
285 if (!mips_elf_check_machine(__h)) \
286 __res = 0; \
287 if (__h->e_ident[EI_CLASS] != ELFCLASS32) \
288 __res = 0; \
289 if ((__h->e_flags & EF_MIPS_ABI2) != 0) { \
290 if (!IS_ENABLED(CONFIG_MIPS32_N32) || \
291 (__h->e_flags & EF_MIPS_ABI)) \
292 __res = 0; \
293 } else { \
294 if (IS_ENABLED(CONFIG_64BIT) && !IS_ENABLED(CONFIG_MIPS32_O32)) \
295 __res = 0; \
296 if (((__h->e_flags & EF_MIPS_ABI) != 0) && \
297 ((__h->e_flags & EF_MIPS_ABI) != EF_MIPS_ABI_O32)) \
298 __res = 0; \
299 if (__h->e_flags & __MIPS_O32_FP64_MUST_BE_ZERO) \
300 __res = 0; \
301 } \
302 __res; \
303 })
304
305 /*
306 * Return non-zero if HDR identifies an n64 ELF binary.
307 */
308 #define elf64_check_arch(hdr) \
309 ({ \
310 int __res = 1; \
311 struct elfhdr *__h = (hdr); \
312 \
313 if (!mips_elf_check_machine(__h)) \
314 __res = 0; \
315 if (__h->e_ident[EI_CLASS] != ELFCLASS64) \
316 __res = 0; \
317 \
318 __res; \
319 })
320
321 struct mips_abi;
322
323 extern struct mips_abi mips_abi;
324 extern struct mips_abi mips_abi_32;
325 extern struct mips_abi mips_abi_n32;
326
327 #ifdef CONFIG_32BIT
328
329 #define SET_PERSONALITY2(ex, state) \
330 do { \
331 clear_thread_flag(TIF_HYBRID_FPREGS); \
332 set_thread_flag(TIF_32BIT_FPREGS); \
333 \
334 current->thread.abi = &mips_abi; \
335 \
336 mips_set_personality_fp(state); \
337 mips_set_personality_nan(state); \
338 \
339 if (personality(current->personality) != PER_LINUX) \
340 set_personality(PER_LINUX); \
341 } while (0)
342
343 #endif /* CONFIG_32BIT */
344
345 #ifdef CONFIG_64BIT
346
347 #ifdef CONFIG_MIPS32_N32
348 #define __SET_PERSONALITY32_N32() \
349 do { \
350 set_thread_flag(TIF_32BIT_ADDR); \
351 \
352 current->thread.abi = &mips_abi_n32; \
353 } while (0)
354 #else
355 #define __SET_PERSONALITY32_N32() \
356 do { } while (0)
357 #endif
358
359 #ifdef CONFIG_MIPS32_O32
360 #define __SET_PERSONALITY32_O32(ex, state) \
361 do { \
362 set_thread_flag(TIF_32BIT_REGS); \
363 set_thread_flag(TIF_32BIT_ADDR); \
364 clear_thread_flag(TIF_HYBRID_FPREGS); \
365 set_thread_flag(TIF_32BIT_FPREGS); \
366 \
367 current->thread.abi = &mips_abi_32; \
368 \
369 mips_set_personality_fp(state); \
370 } while (0)
371 #else
372 #define __SET_PERSONALITY32_O32(ex, state) \
373 do { } while (0)
374 #endif
375
376 #ifdef CONFIG_MIPS32_COMPAT
377 #define __SET_PERSONALITY32(ex, state) \
378 do { \
379 if ((((ex).e_flags & EF_MIPS_ABI2) != 0) && \
380 ((ex).e_flags & EF_MIPS_ABI) == 0) \
381 __SET_PERSONALITY32_N32(); \
382 else \
383 __SET_PERSONALITY32_O32(ex, state); \
384 } while (0)
385 #else
386 #define __SET_PERSONALITY32(ex, state) do { } while (0)
387 #endif
388
389 #define SET_PERSONALITY2(ex, state) \
390 do { \
391 unsigned int p; \
392 \
393 clear_thread_flag(TIF_32BIT_REGS); \
394 clear_thread_flag(TIF_32BIT_FPREGS); \
395 clear_thread_flag(TIF_HYBRID_FPREGS); \
396 clear_thread_flag(TIF_32BIT_ADDR); \
397 current->personality &= ~READ_IMPLIES_EXEC; \
398 \
399 if ((ex).e_ident[EI_CLASS] == ELFCLASS32) \
400 __SET_PERSONALITY32(ex, state); \
401 else \
402 current->thread.abi = &mips_abi; \
403 \
404 mips_set_personality_nan(state); \
405 \
406 p = personality(current->personality); \
407 if (p != PER_LINUX32 && p != PER_LINUX) \
408 set_personality(PER_LINUX); \
409 } while (0)
410
411 #endif /* CONFIG_64BIT */
412
413 #define CORE_DUMP_USE_REGSET
414 #define ELF_EXEC_PAGESIZE PAGE_SIZE
415
416 /* This yields a mask that user programs can use to figure out what
417 instruction set this cpu supports. This could be done in userspace,
418 but it's not easy, and we've already done it here. */
419
420 #define ELF_HWCAP (elf_hwcap)
421 extern unsigned int elf_hwcap;
422 #include <asm/hwcap.h>
423
424 /*
425 * This yields a string that ld.so will use to load implementation
426 * specific libraries for optimization. This is more specific in
427 * intent than poking at uname or /proc/cpuinfo.
428 */
429
430 #define ELF_PLATFORM __elf_platform
431 extern const char *__elf_platform;
432
433 #define ELF_BASE_PLATFORM __elf_base_platform
434 extern const char *__elf_base_platform;
435
436 /*
437 * See comments in asm-alpha/elf.h, this is the same thing
438 * on the MIPS.
439 */
440 #define ELF_PLAT_INIT(_r, load_addr) do { \
441 _r->regs[1] = _r->regs[2] = _r->regs[3] = _r->regs[4] = 0; \
442 _r->regs[5] = _r->regs[6] = _r->regs[7] = _r->regs[8] = 0; \
443 _r->regs[9] = _r->regs[10] = _r->regs[11] = _r->regs[12] = 0; \
444 _r->regs[13] = _r->regs[14] = _r->regs[15] = _r->regs[16] = 0; \
445 _r->regs[17] = _r->regs[18] = _r->regs[19] = _r->regs[20] = 0; \
446 _r->regs[21] = _r->regs[22] = _r->regs[23] = _r->regs[24] = 0; \
447 _r->regs[25] = _r->regs[26] = _r->regs[27] = _r->regs[28] = 0; \
448 _r->regs[30] = _r->regs[31] = 0; \
449 } while (0)
450
451 /* This is the location that an ET_DYN program is loaded if exec'ed. Typical
452 use of this is to invoke "./ld.so someprog" to test out a new version of
453 the loader. We need to make sure that it is out of the way of the program
454 that it will "exec", and that there is sufficient room for the brk. */
455
456 #define ELF_ET_DYN_BASE (TASK_SIZE / 3 * 2)
457
458 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
459 #define ARCH_DLINFO \
460 do { \
461 NEW_AUX_ENT(AT_SYSINFO_EHDR, \
462 (unsigned long)current->mm->context.vdso); \
463 } while (0)
464
465 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
466 struct linux_binprm;
467 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
468 int uses_interp);
469
470 #ifdef CONFIG_MIPS_FP_SUPPORT
471
472 struct arch_elf_state {
473 int nan_2008;
474 int fp_abi;
475 int interp_fp_abi;
476 int overall_fp_mode;
477 };
478
479 #define MIPS_ABI_FP_UNKNOWN (-1) /* Unknown FP ABI (kernel internal) */
480
481 #define INIT_ARCH_ELF_STATE { \
482 .nan_2008 = -1, \
483 .fp_abi = MIPS_ABI_FP_UNKNOWN, \
484 .interp_fp_abi = MIPS_ABI_FP_UNKNOWN, \
485 .overall_fp_mode = -1, \
486 }
487
488 extern int arch_elf_pt_proc(void *ehdr, void *phdr, struct file *elf,
489 bool is_interp, struct arch_elf_state *state);
490
491 extern int arch_check_elf(void *ehdr, bool has_interpreter, void *interp_ehdr,
492 struct arch_elf_state *state);
493
494 /* Whether to accept legacy-NaN and 2008-NaN user binaries. */
495 extern bool mips_use_nan_legacy;
496 extern bool mips_use_nan_2008;
497
498 extern void mips_set_personality_nan(struct arch_elf_state *state);
499 extern void mips_set_personality_fp(struct arch_elf_state *state);
500
501 #else /* !CONFIG_MIPS_FP_SUPPORT */
502
503 struct arch_elf_state;
504
mips_set_personality_nan(struct arch_elf_state * state)505 static inline void mips_set_personality_nan(struct arch_elf_state *state)
506 {
507 /* no-op */
508 }
509
mips_set_personality_fp(struct arch_elf_state * state)510 static inline void mips_set_personality_fp(struct arch_elf_state *state)
511 {
512 /* no-op */
513 }
514
515 #endif /* !CONFIG_MIPS_FP_SUPPORT */
516
517 #define elf_read_implies_exec(ex, stk) mips_elf_read_implies_exec(&(ex), stk)
518 extern int mips_elf_read_implies_exec(void *elf_ex, int exstack);
519
520 #endif /* _ASM_ELF_H */
521