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