1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2012 ARM Ltd.
4 */
5 #ifndef __ASM_ELF_H
6 #define __ASM_ELF_H
7
8 #include <asm/hwcap.h>
9
10 /*
11 * ELF register definitions..
12 */
13 #include <asm/ptrace.h>
14 #include <asm/user.h>
15
16 /*
17 * AArch64 static relocation types.
18 */
19
20 /* Miscellaneous. */
21 #define R_ARM_NONE 0
22 #define R_AARCH64_NONE 256
23
24 /* Data. */
25 #define R_AARCH64_ABS64 257
26 #define R_AARCH64_ABS32 258
27 #define R_AARCH64_ABS16 259
28 #define R_AARCH64_PREL64 260
29 #define R_AARCH64_PREL32 261
30 #define R_AARCH64_PREL16 262
31
32 /* Instructions. */
33 #define R_AARCH64_MOVW_UABS_G0 263
34 #define R_AARCH64_MOVW_UABS_G0_NC 264
35 #define R_AARCH64_MOVW_UABS_G1 265
36 #define R_AARCH64_MOVW_UABS_G1_NC 266
37 #define R_AARCH64_MOVW_UABS_G2 267
38 #define R_AARCH64_MOVW_UABS_G2_NC 268
39 #define R_AARCH64_MOVW_UABS_G3 269
40
41 #define R_AARCH64_MOVW_SABS_G0 270
42 #define R_AARCH64_MOVW_SABS_G1 271
43 #define R_AARCH64_MOVW_SABS_G2 272
44
45 #define R_AARCH64_LD_PREL_LO19 273
46 #define R_AARCH64_ADR_PREL_LO21 274
47 #define R_AARCH64_ADR_PREL_PG_HI21 275
48 #define R_AARCH64_ADR_PREL_PG_HI21_NC 276
49 #define R_AARCH64_ADD_ABS_LO12_NC 277
50 #define R_AARCH64_LDST8_ABS_LO12_NC 278
51
52 #define R_AARCH64_TSTBR14 279
53 #define R_AARCH64_CONDBR19 280
54 #define R_AARCH64_JUMP26 282
55 #define R_AARCH64_CALL26 283
56 #define R_AARCH64_LDST16_ABS_LO12_NC 284
57 #define R_AARCH64_LDST32_ABS_LO12_NC 285
58 #define R_AARCH64_LDST64_ABS_LO12_NC 286
59 #define R_AARCH64_LDST128_ABS_LO12_NC 299
60
61 #define R_AARCH64_MOVW_PREL_G0 287
62 #define R_AARCH64_MOVW_PREL_G0_NC 288
63 #define R_AARCH64_MOVW_PREL_G1 289
64 #define R_AARCH64_MOVW_PREL_G1_NC 290
65 #define R_AARCH64_MOVW_PREL_G2 291
66 #define R_AARCH64_MOVW_PREL_G2_NC 292
67 #define R_AARCH64_MOVW_PREL_G3 293
68
69 #define R_AARCH64_RELATIVE 1027
70
71 /*
72 * These are used to set parameters in the core dumps.
73 */
74 #define ELF_CLASS ELFCLASS64
75 #ifdef __AARCH64EB__
76 #define ELF_DATA ELFDATA2MSB
77 #else
78 #define ELF_DATA ELFDATA2LSB
79 #endif
80 #define ELF_ARCH EM_AARCH64
81
82 /*
83 * This yields a string that ld.so will use to load implementation
84 * specific libraries for optimization. This is more specific in
85 * intent than poking at uname or /proc/cpuinfo.
86 */
87 #define ELF_PLATFORM_SIZE 16
88 #ifdef __AARCH64EB__
89 #define ELF_PLATFORM ("aarch64_be")
90 #else
91 #define ELF_PLATFORM ("aarch64")
92 #endif
93
94 /*
95 * This is used to ensure we don't load something for the wrong architecture.
96 */
97 #define elf_check_arch(x) ((x)->e_machine == EM_AARCH64)
98
99 /*
100 * An executable for which elf_read_implies_exec() returns TRUE will
101 * have the READ_IMPLIES_EXEC personality flag set automatically.
102 *
103 * The decision process for determining the results are:
104 *
105 * CPU*: | arm32 | arm64 |
106 * ELF: | | |
107 * ---------------------|------------|------------|
108 * missing PT_GNU_STACK | exec-all | exec-none |
109 * PT_GNU_STACK == RWX | exec-stack | exec-stack |
110 * PT_GNU_STACK == RW | exec-none | exec-none |
111 *
112 * exec-all : all PROT_READ user mappings are executable, except when
113 * backed by files on a noexec-filesystem.
114 * exec-none : only PROT_EXEC user mappings are executable.
115 * exec-stack: only the stack and PROT_EXEC user mappings are executable.
116 *
117 * *all arm64 CPUs support NX, so there is no "lacks NX" column.
118 *
119 */
120 #define compat_elf_read_implies_exec(ex, stk) (stk == EXSTACK_DEFAULT)
121
122 #define CORE_DUMP_USE_REGSET
123 #define ELF_EXEC_PAGESIZE PAGE_SIZE
124
125 /*
126 * This is the base location for PIE (ET_DYN with INTERP) loads. On
127 * 64-bit, this is above 4GB to leave the entire 32-bit address
128 * space open for things that want to use the area for 32-bit pointers.
129 */
130 #ifdef CONFIG_ARM64_FORCE_52BIT
131 #define ELF_ET_DYN_BASE (2 * TASK_SIZE_64 / 3)
132 #else
133 #define ELF_ET_DYN_BASE (2 * DEFAULT_MAP_WINDOW_64 / 3)
134 #endif /* CONFIG_ARM64_FORCE_52BIT */
135
136 #ifndef __ASSEMBLY__
137
138 #include <uapi/linux/elf.h>
139 #include <linux/bug.h>
140 #include <linux/errno.h>
141 #include <linux/fs.h>
142 #include <linux/types.h>
143 #include <asm/processor.h> /* for signal_minsigstksz, used by ARCH_DLINFO */
144
145 typedef unsigned long elf_greg_t;
146
147 #define ELF_NGREG (sizeof(struct user_pt_regs) / sizeof(elf_greg_t))
148 #define ELF_CORE_COPY_REGS(dest, regs) \
149 *(struct user_pt_regs *)&(dest) = (regs)->user_regs;
150
151 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
152 typedef struct user_fpsimd_state elf_fpregset_t;
153
154 /*
155 * When the program starts, a1 contains a pointer to a function to be
156 * registered with atexit, as per the SVR4 ABI. A value of 0 means we have no
157 * such handler.
158 */
159 #define ELF_PLAT_INIT(_r, load_addr) (_r)->regs[0] = 0
160
161 #define SET_PERSONALITY(ex) \
162 ({ \
163 clear_thread_flag(TIF_32BIT); \
164 current->personality &= ~READ_IMPLIES_EXEC; \
165 })
166
167 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
168 #define ARCH_DLINFO \
169 do { \
170 NEW_AUX_ENT(AT_SYSINFO_EHDR, \
171 (elf_addr_t)current->mm->context.vdso); \
172 \
173 /* \
174 * Should always be nonzero unless there's a kernel bug. \
175 * If we haven't determined a sensible value to give to \
176 * userspace, omit the entry: \
177 */ \
178 if (likely(signal_minsigstksz)) \
179 NEW_AUX_ENT(AT_MINSIGSTKSZ, signal_minsigstksz); \
180 else \
181 NEW_AUX_ENT(AT_IGNORE, 0); \
182 } while (0)
183
184 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES
185 struct linux_binprm;
186 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
187 int uses_interp);
188
189 /* 1GB of VA */
190 #ifdef CONFIG_COMPAT
191 #define STACK_RND_MASK (test_thread_flag(TIF_32BIT) ? \
192 0x7ff >> (PAGE_SHIFT - 12) : \
193 0x3ffff >> (PAGE_SHIFT - 12))
194 #else
195 #define STACK_RND_MASK (0x3ffff >> (PAGE_SHIFT - 12))
196 #endif
197
198 #ifdef __AARCH64EB__
199 #define COMPAT_ELF_PLATFORM ("v8b")
200 #else
201 #define COMPAT_ELF_PLATFORM ("v8l")
202 #endif
203
204 #ifdef CONFIG_COMPAT
205
206 /* PIE load location for compat arm. Must match ARM ELF_ET_DYN_BASE. */
207 #define COMPAT_ELF_ET_DYN_BASE 0x000400000UL
208
209 /* AArch32 registers. */
210 #define COMPAT_ELF_NGREG 18
211 typedef unsigned int compat_elf_greg_t;
212 typedef compat_elf_greg_t compat_elf_gregset_t[COMPAT_ELF_NGREG];
213
214 /* AArch32 EABI. */
215 #define EF_ARM_EABI_MASK 0xff000000
216 #define compat_elf_check_arch(x) (system_supports_32bit_el0() && \
217 ((x)->e_machine == EM_ARM) && \
218 ((x)->e_flags & EF_ARM_EABI_MASK))
219
220 #define compat_start_thread compat_start_thread
221 /*
222 * Unlike the native SET_PERSONALITY macro, the compat version maintains
223 * READ_IMPLIES_EXEC across an execve() since this is the behaviour on
224 * arch/arm/.
225 */
226 #define COMPAT_SET_PERSONALITY(ex) \
227 ({ \
228 set_thread_flag(TIF_32BIT); \
229 })
230 #ifdef CONFIG_COMPAT_VDSO
231 #define COMPAT_ARCH_DLINFO \
232 do { \
233 /* \
234 * Note that we use Elf64_Off instead of elf_addr_t because \
235 * elf_addr_t in compat is defined as Elf32_Addr and casting \
236 * current->mm->context.vdso to it triggers a cast warning of \
237 * cast from pointer to integer of different size. \
238 */ \
239 NEW_AUX_ENT(AT_SYSINFO_EHDR, \
240 (Elf64_Off)current->mm->context.vdso); \
241 } while (0)
242 #else
243 #define COMPAT_ARCH_DLINFO
244 #endif
245 extern int aarch32_setup_additional_pages(struct linux_binprm *bprm,
246 int uses_interp);
247 #define compat_arch_setup_additional_pages \
248 aarch32_setup_additional_pages
249
250 #endif /* CONFIG_COMPAT */
251
252 struct arch_elf_state {
253 int flags;
254 };
255
256 #define ARM64_ELF_BTI (1 << 0)
257
258 #define INIT_ARCH_ELF_STATE { \
259 .flags = 0, \
260 }
261
arch_parse_elf_property(u32 type,const void * data,size_t datasz,bool compat,struct arch_elf_state * arch)262 static inline int arch_parse_elf_property(u32 type, const void *data,
263 size_t datasz, bool compat,
264 struct arch_elf_state *arch)
265 {
266 /* No known properties for AArch32 yet */
267 if (IS_ENABLED(CONFIG_COMPAT) && compat)
268 return 0;
269
270 if (type == GNU_PROPERTY_AARCH64_FEATURE_1_AND) {
271 const u32 *p = data;
272
273 if (datasz != sizeof(*p))
274 return -ENOEXEC;
275
276 if (system_supports_bti() &&
277 (*p & GNU_PROPERTY_AARCH64_FEATURE_1_BTI))
278 arch->flags |= ARM64_ELF_BTI;
279 }
280
281 return 0;
282 }
283
arch_elf_pt_proc(void * ehdr,void * phdr,struct file * f,bool is_interp,struct arch_elf_state * state)284 static inline int arch_elf_pt_proc(void *ehdr, void *phdr,
285 struct file *f, bool is_interp,
286 struct arch_elf_state *state)
287 {
288 return 0;
289 }
290
arch_check_elf(void * ehdr,bool has_interp,void * interp_ehdr,struct arch_elf_state * state)291 static inline int arch_check_elf(void *ehdr, bool has_interp,
292 void *interp_ehdr,
293 struct arch_elf_state *state)
294 {
295 return 0;
296 }
297
298 #endif /* !__ASSEMBLY__ */
299
300 #endif
301