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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#define elf_read_implies_exec(ex,stk) (stk != EXSTACK_DISABLE_X)
100
101#define CORE_DUMP_USE_REGSET
102#define ELF_EXEC_PAGESIZE PAGE_SIZE
103
104/*
105 * This is the base location for PIE (ET_DYN with INTERP) loads. On
106 * 64-bit, this is above 4GB to leave the entire 32-bit address
107 * space open for things that want to use the area for 32-bit pointers.
108 */
109#ifdef CONFIG_ARM64_FORCE_52BIT
110#define ELF_ET_DYN_BASE (2 * TASK_SIZE_64 / 3)
111#else
112#define ELF_ET_DYN_BASE (2 * DEFAULT_MAP_WINDOW_64 / 3)
113#endif /* CONFIG_ARM64_FORCE_52BIT */
114
115#ifndef __ASSEMBLY__
116
117#include <linux/bug.h>
118#include <asm/processor.h> /* for signal_minsigstksz, used by ARCH_DLINFO */
119
120typedef unsigned long elf_greg_t;
121
122#define ELF_NGREG (sizeof(struct user_pt_regs) / sizeof(elf_greg_t))
123#define ELF_CORE_COPY_REGS(dest, regs) \
124 *(struct user_pt_regs *)&(dest) = (regs)->user_regs;
125
126typedef elf_greg_t elf_gregset_t[ELF_NGREG];
127typedef struct user_fpsimd_state elf_fpregset_t;
128
129/*
130 * When the program starts, a1 contains a pointer to a function to be
131 * registered with atexit, as per the SVR4 ABI. A value of 0 means we have no
132 * such handler.
133 */
134#define ELF_PLAT_INIT(_r, load_addr) (_r)->regs[0] = 0
135
136#define SET_PERSONALITY(ex) \
137({ \
138 clear_thread_flag(TIF_32BIT); \
139 current->personality &= ~READ_IMPLIES_EXEC; \
140})
141
142/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
143#define ARCH_DLINFO \
144do { \
145 NEW_AUX_ENT(AT_SYSINFO_EHDR, \
146 (elf_addr_t)current->mm->context.vdso); \
147 \
148 /* \
149 * Should always be nonzero unless there's a kernel bug. \
150 * If we haven't determined a sensible value to give to \
151 * userspace, omit the entry: \
152 */ \
153 if (likely(signal_minsigstksz)) \
154 NEW_AUX_ENT(AT_MINSIGSTKSZ, signal_minsigstksz); \
155 else \
156 NEW_AUX_ENT(AT_IGNORE, 0); \
157} while (0)
158
159#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
160struct linux_binprm;
161extern int arch_setup_additional_pages(struct linux_binprm *bprm,
162 int uses_interp);
163
164/* 1GB of VA */
165#ifdef CONFIG_COMPAT
166#define STACK_RND_MASK (test_thread_flag(TIF_32BIT) ? \
167 0x7ff >> (PAGE_SHIFT - 12) : \
168 0x3ffff >> (PAGE_SHIFT - 12))
169#else
170#define STACK_RND_MASK (0x3ffff >> (PAGE_SHIFT - 12))
171#endif
172
173#ifdef __AARCH64EB__
174#define COMPAT_ELF_PLATFORM ("v8b")
175#else
176#define COMPAT_ELF_PLATFORM ("v8l")
177#endif
178
179#ifdef CONFIG_COMPAT
180
181/* PIE load location for compat arm. Must match ARM ELF_ET_DYN_BASE. */
182#define COMPAT_ELF_ET_DYN_BASE 0x000400000UL
183
184/* AArch32 registers. */
185#define COMPAT_ELF_NGREG 18
186typedef unsigned int compat_elf_greg_t;
187typedef compat_elf_greg_t compat_elf_gregset_t[COMPAT_ELF_NGREG];
188
189/* AArch32 EABI. */
190#define EF_ARM_EABI_MASK 0xff000000
191#define compat_elf_check_arch(x) (system_supports_32bit_el0() && \
192 ((x)->e_machine == EM_ARM) && \
193 ((x)->e_flags & EF_ARM_EABI_MASK))
194
195#define compat_start_thread compat_start_thread
196/*
197 * Unlike the native SET_PERSONALITY macro, the compat version maintains
198 * READ_IMPLIES_EXEC across an execve() since this is the behaviour on
199 * arch/arm/.
200 */
201#define COMPAT_SET_PERSONALITY(ex) \
202({ \
203 set_thread_flag(TIF_32BIT); \
204 })
205#ifdef CONFIG_COMPAT_VDSO
206#define COMPAT_ARCH_DLINFO \
207do { \
208 /* \
209 * Note that we use Elf64_Off instead of elf_addr_t because \
210 * elf_addr_t in compat is defined as Elf32_Addr and casting \
211 * current->mm->context.vdso to it triggers a cast warning of \
212 * cast from pointer to integer of different size. \
213 */ \
214 NEW_AUX_ENT(AT_SYSINFO_EHDR, \
215 (Elf64_Off)current->mm->context.vdso); \
216} while (0)
217#else
218#define COMPAT_ARCH_DLINFO
219#endif
220extern int aarch32_setup_additional_pages(struct linux_binprm *bprm,
221 int uses_interp);
222#define compat_arch_setup_additional_pages \
223 aarch32_setup_additional_pages
224
225#endif /* CONFIG_COMPAT */
226
227#endif /* !__ASSEMBLY__ */
228
229#endif
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
145typedef 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
151typedef elf_greg_t elf_gregset_t[ELF_NGREG];
152typedef 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 \
169do { \
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
185struct linux_binprm;
186extern 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
211typedef unsigned int compat_elf_greg_t;
212typedef compat_elf_greg_t compat_elf_gregset_t[COMPAT_ELF_NGREG];
213
214/* AArch32 EABI. */
215#define EF_ARM_EABI_MASK 0xff000000
216int compat_elf_check_arch(const struct elf32_hdr *);
217#define compat_elf_check_arch compat_elf_check_arch
218#define compat_start_thread compat_start_thread
219/*
220 * Unlike the native SET_PERSONALITY macro, the compat version maintains
221 * READ_IMPLIES_EXEC across an execve() since this is the behaviour on
222 * arch/arm/.
223 */
224#define COMPAT_SET_PERSONALITY(ex) \
225({ \
226 set_thread_flag(TIF_32BIT); \
227 })
228#ifdef CONFIG_COMPAT_VDSO
229#define COMPAT_ARCH_DLINFO \
230do { \
231 /* \
232 * Note that we use Elf64_Off instead of elf_addr_t because \
233 * elf_addr_t in compat is defined as Elf32_Addr and casting \
234 * current->mm->context.vdso to it triggers a cast warning of \
235 * cast from pointer to integer of different size. \
236 */ \
237 NEW_AUX_ENT(AT_SYSINFO_EHDR, \
238 (Elf64_Off)current->mm->context.vdso); \
239} while (0)
240#else
241#define COMPAT_ARCH_DLINFO
242#endif
243extern int aarch32_setup_additional_pages(struct linux_binprm *bprm,
244 int uses_interp);
245#define compat_arch_setup_additional_pages \
246 aarch32_setup_additional_pages
247
248#endif /* CONFIG_COMPAT */
249
250struct arch_elf_state {
251 int flags;
252};
253
254#define ARM64_ELF_BTI (1 << 0)
255
256#define INIT_ARCH_ELF_STATE { \
257 .flags = 0, \
258}
259
260static inline int arch_parse_elf_property(u32 type, const void *data,
261 size_t datasz, bool compat,
262 struct arch_elf_state *arch)
263{
264 /* No known properties for AArch32 yet */
265 if (IS_ENABLED(CONFIG_COMPAT) && compat)
266 return 0;
267
268 if (type == GNU_PROPERTY_AARCH64_FEATURE_1_AND) {
269 const u32 *p = data;
270
271 if (datasz != sizeof(*p))
272 return -ENOEXEC;
273
274 if (system_supports_bti() &&
275 (*p & GNU_PROPERTY_AARCH64_FEATURE_1_BTI))
276 arch->flags |= ARM64_ELF_BTI;
277 }
278
279 return 0;
280}
281
282static inline int arch_elf_pt_proc(void *ehdr, void *phdr,
283 struct file *f, bool is_interp,
284 struct arch_elf_state *state)
285{
286 return 0;
287}
288
289static inline int arch_check_elf(void *ehdr, bool has_interp,
290 void *interp_ehdr,
291 struct arch_elf_state *state)
292{
293 return 0;
294}
295
296#endif /* !__ASSEMBLY__ */
297
298#endif