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