xref: /openbmc/linux/arch/mips/include/asm/elf.h (revision c819e2cf)
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/fs.h>
12 #include <uapi/linux/elf.h>
13 
14 /* ELF header e_flags defines. */
15 /* MIPS architecture level. */
16 #define EF_MIPS_ARCH_1		0x00000000	/* -mips1 code.	 */
17 #define EF_MIPS_ARCH_2		0x10000000	/* -mips2 code.	 */
18 #define EF_MIPS_ARCH_3		0x20000000	/* -mips3 code.	 */
19 #define EF_MIPS_ARCH_4		0x30000000	/* -mips4 code.	 */
20 #define EF_MIPS_ARCH_5		0x40000000	/* -mips5 code.	 */
21 #define EF_MIPS_ARCH_32		0x50000000	/* MIPS32 code.	 */
22 #define EF_MIPS_ARCH_64		0x60000000	/* MIPS64 code.	 */
23 #define EF_MIPS_ARCH_32R2	0x70000000	/* MIPS32 R2 code.  */
24 #define EF_MIPS_ARCH_64R2	0x80000000	/* MIPS64 R2 code.  */
25 
26 /* The ABI of a file. */
27 #define EF_MIPS_ABI_O32		0x00001000	/* O32 ABI.  */
28 #define EF_MIPS_ABI_O64		0x00002000	/* O32 extended for 64 bit.  */
29 
30 #define PT_MIPS_REGINFO		0x70000000
31 #define PT_MIPS_RTPROC		0x70000001
32 #define PT_MIPS_OPTIONS		0x70000002
33 #define PT_MIPS_ABIFLAGS	0x70000003
34 
35 /* Flags in the e_flags field of the header */
36 #define EF_MIPS_NOREORDER	0x00000001
37 #define EF_MIPS_PIC		0x00000002
38 #define EF_MIPS_CPIC		0x00000004
39 #define EF_MIPS_ABI2		0x00000020
40 #define EF_MIPS_OPTIONS_FIRST	0x00000080
41 #define EF_MIPS_32BITMODE	0x00000100
42 #define EF_MIPS_FP64		0x00000200
43 #define EF_MIPS_ABI		0x0000f000
44 #define EF_MIPS_ARCH		0xf0000000
45 
46 #define DT_MIPS_RLD_VERSION	0x70000001
47 #define DT_MIPS_TIME_STAMP	0x70000002
48 #define DT_MIPS_ICHECKSUM	0x70000003
49 #define DT_MIPS_IVERSION	0x70000004
50 #define DT_MIPS_FLAGS		0x70000005
51 	#define RHF_NONE	0x00000000
52 	#define RHF_HARDWAY	0x00000001
53 	#define RHF_NOTPOT	0x00000002
54 	#define RHF_SGI_ONLY	0x00000010
55 #define DT_MIPS_BASE_ADDRESS	0x70000006
56 #define DT_MIPS_CONFLICT	0x70000008
57 #define DT_MIPS_LIBLIST		0x70000009
58 #define DT_MIPS_LOCAL_GOTNO	0x7000000a
59 #define DT_MIPS_CONFLICTNO	0x7000000b
60 #define DT_MIPS_LIBLISTNO	0x70000010
61 #define DT_MIPS_SYMTABNO	0x70000011
62 #define DT_MIPS_UNREFEXTNO	0x70000012
63 #define DT_MIPS_GOTSYM		0x70000013
64 #define DT_MIPS_HIPAGENO	0x70000014
65 #define DT_MIPS_RLD_MAP		0x70000016
66 
67 #define R_MIPS_NONE		0
68 #define R_MIPS_16		1
69 #define R_MIPS_32		2
70 #define R_MIPS_REL32		3
71 #define R_MIPS_26		4
72 #define R_MIPS_HI16		5
73 #define R_MIPS_LO16		6
74 #define R_MIPS_GPREL16		7
75 #define R_MIPS_LITERAL		8
76 #define R_MIPS_GOT16		9
77 #define R_MIPS_PC16		10
78 #define R_MIPS_CALL16		11
79 #define R_MIPS_GPREL32		12
80 /* The remaining relocs are defined on Irix, although they are not
81    in the MIPS ELF ABI.	 */
82 #define R_MIPS_UNUSED1		13
83 #define R_MIPS_UNUSED2		14
84 #define R_MIPS_UNUSED3		15
85 #define R_MIPS_SHIFT5		16
86 #define R_MIPS_SHIFT6		17
87 #define R_MIPS_64		18
88 #define R_MIPS_GOT_DISP		19
89 #define R_MIPS_GOT_PAGE		20
90 #define R_MIPS_GOT_OFST		21
91 /*
92  * The following two relocation types are specified in the MIPS ABI
93  * conformance guide version 1.2 but not yet in the psABI.
94  */
95 #define R_MIPS_GOTHI16		22
96 #define R_MIPS_GOTLO16		23
97 #define R_MIPS_SUB		24
98 #define R_MIPS_INSERT_A		25
99 #define R_MIPS_INSERT_B		26
100 #define R_MIPS_DELETE		27
101 #define R_MIPS_HIGHER		28
102 #define R_MIPS_HIGHEST		29
103 /*
104  * The following two relocation types are specified in the MIPS ABI
105  * conformance guide version 1.2 but not yet in the psABI.
106  */
107 #define R_MIPS_CALLHI16		30
108 #define R_MIPS_CALLLO16		31
109 /*
110  * This range is reserved for vendor specific relocations.
111  */
112 #define R_MIPS_LOVENDOR		100
113 #define R_MIPS_HIVENDOR		127
114 
115 #define SHN_MIPS_ACCOMON	0xff00		/* Allocated common symbols */
116 #define SHN_MIPS_TEXT		0xff01		/* Allocated test symbols.  */
117 #define SHN_MIPS_DATA		0xff02		/* Allocated data symbols.  */
118 #define SHN_MIPS_SCOMMON	0xff03		/* Small common symbols */
119 #define SHN_MIPS_SUNDEFINED	0xff04		/* Small undefined symbols */
120 
121 #define SHT_MIPS_LIST		0x70000000
122 #define SHT_MIPS_CONFLICT	0x70000002
123 #define SHT_MIPS_GPTAB		0x70000003
124 #define SHT_MIPS_UCODE		0x70000004
125 #define SHT_MIPS_DEBUG		0x70000005
126 #define SHT_MIPS_REGINFO	0x70000006
127 #define SHT_MIPS_PACKAGE	0x70000007
128 #define SHT_MIPS_PACKSYM	0x70000008
129 #define SHT_MIPS_RELD		0x70000009
130 #define SHT_MIPS_IFACE		0x7000000b
131 #define SHT_MIPS_CONTENT	0x7000000c
132 #define SHT_MIPS_OPTIONS	0x7000000d
133 #define SHT_MIPS_SHDR		0x70000010
134 #define SHT_MIPS_FDESC		0x70000011
135 #define SHT_MIPS_EXTSYM		0x70000012
136 #define SHT_MIPS_DENSE		0x70000013
137 #define SHT_MIPS_PDESC		0x70000014
138 #define SHT_MIPS_LOCSYM		0x70000015
139 #define SHT_MIPS_AUXSYM		0x70000016
140 #define SHT_MIPS_OPTSYM		0x70000017
141 #define SHT_MIPS_LOCSTR		0x70000018
142 #define SHT_MIPS_LINE		0x70000019
143 #define SHT_MIPS_RFDESC		0x7000001a
144 #define SHT_MIPS_DELTASYM	0x7000001b
145 #define SHT_MIPS_DELTAINST	0x7000001c
146 #define SHT_MIPS_DELTACLASS	0x7000001d
147 #define SHT_MIPS_DWARF		0x7000001e
148 #define SHT_MIPS_DELTADECL	0x7000001f
149 #define SHT_MIPS_SYMBOL_LIB	0x70000020
150 #define SHT_MIPS_EVENTS		0x70000021
151 #define SHT_MIPS_TRANSLATE	0x70000022
152 #define SHT_MIPS_PIXIE		0x70000023
153 #define SHT_MIPS_XLATE		0x70000024
154 #define SHT_MIPS_XLATE_DEBUG	0x70000025
155 #define SHT_MIPS_WHIRL		0x70000026
156 #define SHT_MIPS_EH_REGION	0x70000027
157 #define SHT_MIPS_XLATE_OLD	0x70000028
158 #define SHT_MIPS_PDR_EXCEPTION	0x70000029
159 
160 #define SHF_MIPS_GPREL		0x10000000
161 #define SHF_MIPS_MERGE		0x20000000
162 #define SHF_MIPS_ADDR		0x40000000
163 #define SHF_MIPS_STRING		0x80000000
164 #define SHF_MIPS_NOSTRIP	0x08000000
165 #define SHF_MIPS_LOCAL		0x04000000
166 #define SHF_MIPS_NAMES		0x02000000
167 #define SHF_MIPS_NODUPES	0x01000000
168 
169 #ifndef ELF_ARCH
170 /* ELF register definitions */
171 #define ELF_NGREG	45
172 #define ELF_NFPREG	33
173 
174 typedef unsigned long elf_greg_t;
175 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
176 
177 typedef double elf_fpreg_t;
178 typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
179 
180 struct mips_elf_abiflags_v0 {
181 	uint16_t version;	/* Version of flags structure */
182 	uint8_t isa_level;	/* The level of the ISA: 1-5, 32, 64 */
183 	uint8_t isa_rev;	/* The revision of ISA: 0 for MIPS V and below,
184 				   1-n otherwise */
185 	uint8_t gpr_size;	/* The size of general purpose registers */
186 	uint8_t cpr1_size;	/* The size of co-processor 1 registers */
187 	uint8_t cpr2_size;	/* The size of co-processor 2 registers */
188 	uint8_t fp_abi;		/* The floating-point ABI */
189 	uint32_t isa_ext;	/* Mask of processor-specific extensions */
190 	uint32_t ases;		/* Mask of ASEs used */
191 	uint32_t flags1;	/* Mask of general flags */
192 	uint32_t flags2;
193 };
194 
195 #define MIPS_ABI_FP_ANY		0	/* FP ABI doesn't matter */
196 #define MIPS_ABI_FP_DOUBLE	1	/* -mdouble-float */
197 #define MIPS_ABI_FP_SINGLE	2	/* -msingle-float */
198 #define MIPS_ABI_FP_SOFT	3	/* -msoft-float */
199 #define MIPS_ABI_FP_OLD_64	4	/* -mips32r2 -mfp64 */
200 #define MIPS_ABI_FP_XX		5	/* -mfpxx */
201 #define MIPS_ABI_FP_64		6	/* -mips32r2 -mfp64 */
202 #define MIPS_ABI_FP_64A		7	/* -mips32r2 -mfp64 -mno-odd-spreg */
203 
204 #ifdef CONFIG_32BIT
205 
206 /*
207  * In order to be sure that we don't attempt to execute an O32 binary which
208  * requires 64 bit FP (FR=1) on a system which does not support it we refuse
209  * to execute any binary which has bits specified by the following macro set
210  * in its ELF header flags.
211  */
212 #ifdef CONFIG_MIPS_O32_FP64_SUPPORT
213 # define __MIPS_O32_FP64_MUST_BE_ZERO	0
214 #else
215 # define __MIPS_O32_FP64_MUST_BE_ZERO	EF_MIPS_FP64
216 #endif
217 
218 /*
219  * This is used to ensure we don't load something for the wrong architecture.
220  */
221 #define elf_check_arch(hdr)						\
222 ({									\
223 	int __res = 1;							\
224 	struct elfhdr *__h = (hdr);					\
225 									\
226 	if (__h->e_machine != EM_MIPS)					\
227 		__res = 0;						\
228 	if (__h->e_ident[EI_CLASS] != ELFCLASS32)			\
229 		__res = 0;						\
230 	if ((__h->e_flags & EF_MIPS_ABI2) != 0)				\
231 		__res = 0;						\
232 	if (((__h->e_flags & EF_MIPS_ABI) != 0) &&			\
233 	    ((__h->e_flags & EF_MIPS_ABI) != EF_MIPS_ABI_O32))		\
234 		__res = 0;						\
235 	if (__h->e_flags & __MIPS_O32_FP64_MUST_BE_ZERO)		\
236 		__res = 0;						\
237 									\
238 	__res;								\
239 })
240 
241 /*
242  * These are used to set parameters in the core dumps.
243  */
244 #define ELF_CLASS	ELFCLASS32
245 
246 #endif /* CONFIG_32BIT */
247 
248 #ifdef CONFIG_64BIT
249 /*
250  * This is used to ensure we don't load something for the wrong architecture.
251  */
252 #define elf_check_arch(hdr)						\
253 ({									\
254 	int __res = 1;							\
255 	struct elfhdr *__h = (hdr);					\
256 									\
257 	if (__h->e_machine != EM_MIPS)					\
258 		__res = 0;						\
259 	if (__h->e_ident[EI_CLASS] != ELFCLASS64)			\
260 		__res = 0;						\
261 									\
262 	__res;								\
263 })
264 
265 /*
266  * These are used to set parameters in the core dumps.
267  */
268 #define ELF_CLASS	ELFCLASS64
269 
270 #endif /* CONFIG_64BIT */
271 
272 /*
273  * These are used to set parameters in the core dumps.
274  */
275 #ifdef __MIPSEB__
276 #define ELF_DATA	ELFDATA2MSB
277 #elif defined(__MIPSEL__)
278 #define ELF_DATA	ELFDATA2LSB
279 #endif
280 #define ELF_ARCH	EM_MIPS
281 
282 #endif /* !defined(ELF_ARCH) */
283 
284 struct mips_abi;
285 
286 extern struct mips_abi mips_abi;
287 extern struct mips_abi mips_abi_32;
288 extern struct mips_abi mips_abi_n32;
289 
290 #ifdef CONFIG_32BIT
291 
292 #define SET_PERSONALITY2(ex, state)					\
293 do {									\
294 	if (personality(current->personality) != PER_LINUX)		\
295 		set_personality(PER_LINUX);				\
296 									\
297 	mips_set_personality_fp(state);					\
298 									\
299 	current->thread.abi = &mips_abi;				\
300 } while (0)
301 
302 #endif /* CONFIG_32BIT */
303 
304 #ifdef CONFIG_64BIT
305 
306 #ifdef CONFIG_MIPS32_N32
307 #define __SET_PERSONALITY32_N32()					\
308 	do {								\
309 		set_thread_flag(TIF_32BIT_ADDR);			\
310 		current->thread.abi = &mips_abi_n32;			\
311 	} while (0)
312 #else
313 #define __SET_PERSONALITY32_N32()					\
314 	do { } while (0)
315 #endif
316 
317 #ifdef CONFIG_MIPS32_O32
318 #define __SET_PERSONALITY32_O32(ex, state)				\
319 	do {								\
320 		set_thread_flag(TIF_32BIT_REGS);			\
321 		set_thread_flag(TIF_32BIT_ADDR);			\
322 									\
323 		mips_set_personality_fp(state);				\
324 									\
325 		current->thread.abi = &mips_abi_32;			\
326 	} while (0)
327 #else
328 #define __SET_PERSONALITY32_O32(ex, state)				\
329 	do { } while (0)
330 #endif
331 
332 #ifdef CONFIG_MIPS32_COMPAT
333 #define __SET_PERSONALITY32(ex, state)					\
334 do {									\
335 	if ((((ex).e_flags & EF_MIPS_ABI2) != 0) &&			\
336 	     ((ex).e_flags & EF_MIPS_ABI) == 0)				\
337 		__SET_PERSONALITY32_N32();				\
338 	else								\
339 		__SET_PERSONALITY32_O32(ex, state);			\
340 } while (0)
341 #else
342 #define __SET_PERSONALITY32(ex, state) do { } while (0)
343 #endif
344 
345 #define SET_PERSONALITY2(ex, state)					\
346 do {									\
347 	unsigned int p;							\
348 									\
349 	clear_thread_flag(TIF_32BIT_REGS);				\
350 	clear_thread_flag(TIF_32BIT_FPREGS);				\
351 	clear_thread_flag(TIF_HYBRID_FPREGS);				\
352 	clear_thread_flag(TIF_32BIT_ADDR);				\
353 									\
354 	if ((ex).e_ident[EI_CLASS] == ELFCLASS32)			\
355 		__SET_PERSONALITY32(ex, state);				\
356 	else								\
357 		current->thread.abi = &mips_abi;			\
358 									\
359 	p = personality(current->personality);				\
360 	if (p != PER_LINUX32 && p != PER_LINUX)				\
361 		set_personality(PER_LINUX);				\
362 } while (0)
363 
364 #endif /* CONFIG_64BIT */
365 
366 #define CORE_DUMP_USE_REGSET
367 #define ELF_EXEC_PAGESIZE	PAGE_SIZE
368 
369 /* This yields a mask that user programs can use to figure out what
370    instruction set this cpu supports.  This could be done in userspace,
371    but it's not easy, and we've already done it here.  */
372 
373 #define ELF_HWCAP	(0)
374 
375 /*
376  * This yields a string that ld.so will use to load implementation
377  * specific libraries for optimization.	 This is more specific in
378  * intent than poking at uname or /proc/cpuinfo.
379  */
380 
381 #define ELF_PLATFORM  __elf_platform
382 extern const char *__elf_platform;
383 
384 /*
385  * See comments in asm-alpha/elf.h, this is the same thing
386  * on the MIPS.
387  */
388 #define ELF_PLAT_INIT(_r, load_addr)	do { \
389 	_r->regs[1] = _r->regs[2] = _r->regs[3] = _r->regs[4] = 0;	\
390 	_r->regs[5] = _r->regs[6] = _r->regs[7] = _r->regs[8] = 0;	\
391 	_r->regs[9] = _r->regs[10] = _r->regs[11] = _r->regs[12] = 0;	\
392 	_r->regs[13] = _r->regs[14] = _r->regs[15] = _r->regs[16] = 0;	\
393 	_r->regs[17] = _r->regs[18] = _r->regs[19] = _r->regs[20] = 0;	\
394 	_r->regs[21] = _r->regs[22] = _r->regs[23] = _r->regs[24] = 0;	\
395 	_r->regs[25] = _r->regs[26] = _r->regs[27] = _r->regs[28] = 0;	\
396 	_r->regs[30] = _r->regs[31] = 0;				\
397 } while (0)
398 
399 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
400    use of this is to invoke "./ld.so someprog" to test out a new version of
401    the loader.	We need to make sure that it is out of the way of the program
402    that it will "exec", and that there is sufficient room for the brk.	*/
403 
404 #ifndef ELF_ET_DYN_BASE
405 #define ELF_ET_DYN_BASE		(TASK_SIZE / 3 * 2)
406 #endif
407 
408 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
409 struct linux_binprm;
410 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
411 				       int uses_interp);
412 
413 struct mm_struct;
414 extern unsigned long arch_randomize_brk(struct mm_struct *mm);
415 #define arch_randomize_brk arch_randomize_brk
416 
417 struct arch_elf_state {
418 	int fp_abi;
419 	int interp_fp_abi;
420 	int overall_abi;
421 };
422 
423 #define INIT_ARCH_ELF_STATE {			\
424 	.fp_abi = -1,				\
425 	.interp_fp_abi = -1,			\
426 	.overall_abi = -1,			\
427 }
428 
429 extern int arch_elf_pt_proc(void *ehdr, void *phdr, struct file *elf,
430 			    bool is_interp, struct arch_elf_state *state);
431 
432 extern int arch_check_elf(void *ehdr, bool has_interpreter,
433 			  struct arch_elf_state *state);
434 
435 extern void mips_set_personality_fp(struct arch_elf_state *state);
436 
437 #endif /* _ASM_ELF_H */
438