1caab277bSThomas Gleixner /* SPDX-License-Identifier: GPL-2.0-only */
2f668cd16SCatalin Marinas /*
3f668cd16SCatalin Marinas * Copyright (C) 2012 ARM Ltd.
4f668cd16SCatalin Marinas */
5f668cd16SCatalin Marinas #ifndef __ASM_ELF_H
6f668cd16SCatalin Marinas #define __ASM_ELF_H
7f668cd16SCatalin Marinas
8f668cd16SCatalin Marinas #include <asm/hwcap.h>
9f668cd16SCatalin Marinas
10f668cd16SCatalin Marinas /*
11f668cd16SCatalin Marinas * ELF register definitions..
12f668cd16SCatalin Marinas */
13f668cd16SCatalin Marinas #include <asm/ptrace.h>
14f668cd16SCatalin Marinas #include <asm/user.h>
15f668cd16SCatalin Marinas
16f668cd16SCatalin Marinas /*
17f668cd16SCatalin Marinas * AArch64 static relocation types.
18f668cd16SCatalin Marinas */
19f668cd16SCatalin Marinas
20f668cd16SCatalin Marinas /* Miscellaneous. */
21f668cd16SCatalin Marinas #define R_ARM_NONE 0
22f668cd16SCatalin Marinas #define R_AARCH64_NONE 256
23f668cd16SCatalin Marinas
24f668cd16SCatalin Marinas /* Data. */
25f668cd16SCatalin Marinas #define R_AARCH64_ABS64 257
26f668cd16SCatalin Marinas #define R_AARCH64_ABS32 258
27f668cd16SCatalin Marinas #define R_AARCH64_ABS16 259
28f668cd16SCatalin Marinas #define R_AARCH64_PREL64 260
29f668cd16SCatalin Marinas #define R_AARCH64_PREL32 261
30f668cd16SCatalin Marinas #define R_AARCH64_PREL16 262
31f668cd16SCatalin Marinas
32f668cd16SCatalin Marinas /* Instructions. */
33f668cd16SCatalin Marinas #define R_AARCH64_MOVW_UABS_G0 263
34f668cd16SCatalin Marinas #define R_AARCH64_MOVW_UABS_G0_NC 264
35f668cd16SCatalin Marinas #define R_AARCH64_MOVW_UABS_G1 265
36f668cd16SCatalin Marinas #define R_AARCH64_MOVW_UABS_G1_NC 266
37f668cd16SCatalin Marinas #define R_AARCH64_MOVW_UABS_G2 267
38f668cd16SCatalin Marinas #define R_AARCH64_MOVW_UABS_G2_NC 268
39f668cd16SCatalin Marinas #define R_AARCH64_MOVW_UABS_G3 269
40f668cd16SCatalin Marinas
41f668cd16SCatalin Marinas #define R_AARCH64_MOVW_SABS_G0 270
42f668cd16SCatalin Marinas #define R_AARCH64_MOVW_SABS_G1 271
43f668cd16SCatalin Marinas #define R_AARCH64_MOVW_SABS_G2 272
44f668cd16SCatalin Marinas
45f668cd16SCatalin Marinas #define R_AARCH64_LD_PREL_LO19 273
46f668cd16SCatalin Marinas #define R_AARCH64_ADR_PREL_LO21 274
47f668cd16SCatalin Marinas #define R_AARCH64_ADR_PREL_PG_HI21 275
48f668cd16SCatalin Marinas #define R_AARCH64_ADR_PREL_PG_HI21_NC 276
49f668cd16SCatalin Marinas #define R_AARCH64_ADD_ABS_LO12_NC 277
50f668cd16SCatalin Marinas #define R_AARCH64_LDST8_ABS_LO12_NC 278
51f668cd16SCatalin Marinas
52f668cd16SCatalin Marinas #define R_AARCH64_TSTBR14 279
53f668cd16SCatalin Marinas #define R_AARCH64_CONDBR19 280
54f668cd16SCatalin Marinas #define R_AARCH64_JUMP26 282
55f668cd16SCatalin Marinas #define R_AARCH64_CALL26 283
56f668cd16SCatalin Marinas #define R_AARCH64_LDST16_ABS_LO12_NC 284
57f668cd16SCatalin Marinas #define R_AARCH64_LDST32_ABS_LO12_NC 285
58f668cd16SCatalin Marinas #define R_AARCH64_LDST64_ABS_LO12_NC 286
59f668cd16SCatalin Marinas #define R_AARCH64_LDST128_ABS_LO12_NC 299
60f668cd16SCatalin Marinas
61f668cd16SCatalin Marinas #define R_AARCH64_MOVW_PREL_G0 287
62f668cd16SCatalin Marinas #define R_AARCH64_MOVW_PREL_G0_NC 288
63f668cd16SCatalin Marinas #define R_AARCH64_MOVW_PREL_G1 289
64f668cd16SCatalin Marinas #define R_AARCH64_MOVW_PREL_G1_NC 290
65f668cd16SCatalin Marinas #define R_AARCH64_MOVW_PREL_G2 291
66f668cd16SCatalin Marinas #define R_AARCH64_MOVW_PREL_G2_NC 292
67f668cd16SCatalin Marinas #define R_AARCH64_MOVW_PREL_G3 293
68f668cd16SCatalin Marinas
691e48ef7fSArd Biesheuvel #define R_AARCH64_RELATIVE 1027
701e48ef7fSArd Biesheuvel
71f668cd16SCatalin Marinas /*
72f668cd16SCatalin Marinas * These are used to set parameters in the core dumps.
73f668cd16SCatalin Marinas */
74f668cd16SCatalin Marinas #define ELF_CLASS ELFCLASS64
755436b5c8SWill Deacon #ifdef __AARCH64EB__
765436b5c8SWill Deacon #define ELF_DATA ELFDATA2MSB
775436b5c8SWill Deacon #else
78f668cd16SCatalin Marinas #define ELF_DATA ELFDATA2LSB
795436b5c8SWill Deacon #endif
80f668cd16SCatalin Marinas #define ELF_ARCH EM_AARCH64
81f668cd16SCatalin Marinas
825436b5c8SWill Deacon /*
835436b5c8SWill Deacon * This yields a string that ld.so will use to load implementation
845436b5c8SWill Deacon * specific libraries for optimization. This is more specific in
855436b5c8SWill Deacon * intent than poking at uname or /proc/cpuinfo.
865436b5c8SWill Deacon */
87f668cd16SCatalin Marinas #define ELF_PLATFORM_SIZE 16
885436b5c8SWill Deacon #ifdef __AARCH64EB__
895436b5c8SWill Deacon #define ELF_PLATFORM ("aarch64_be")
905436b5c8SWill Deacon #else
91f668cd16SCatalin Marinas #define ELF_PLATFORM ("aarch64")
925436b5c8SWill Deacon #endif
93f668cd16SCatalin Marinas
94f668cd16SCatalin Marinas /*
95f668cd16SCatalin Marinas * This is used to ensure we don't load something for the wrong architecture.
96f668cd16SCatalin Marinas */
97f668cd16SCatalin Marinas #define elf_check_arch(x) ((x)->e_machine == EM_AARCH64)
98f668cd16SCatalin Marinas
9978066055SKees Cook /*
10078066055SKees Cook * An executable for which elf_read_implies_exec() returns TRUE will
10178066055SKees Cook * have the READ_IMPLIES_EXEC personality flag set automatically.
10278066055SKees Cook *
10378066055SKees Cook * The decision process for determining the results are:
10478066055SKees Cook *
10578066055SKees Cook * CPU*: | arm32 | arm64 |
10678066055SKees Cook * ELF: | | |
10778066055SKees Cook * ---------------------|------------|------------|
1086e0d6ac5SKees Cook * missing PT_GNU_STACK | exec-all | exec-none |
109eaf3f9e6SKees Cook * PT_GNU_STACK == RWX | exec-stack | exec-stack |
11078066055SKees Cook * PT_GNU_STACK == RW | exec-none | exec-none |
11178066055SKees Cook *
11278066055SKees Cook * exec-all : all PROT_READ user mappings are executable, except when
11378066055SKees Cook * backed by files on a noexec-filesystem.
11478066055SKees Cook * exec-none : only PROT_EXEC user mappings are executable.
115eaf3f9e6SKees Cook * exec-stack: only the stack and PROT_EXEC user mappings are executable.
11678066055SKees Cook *
11778066055SKees Cook * *all arm64 CPUs support NX, so there is no "lacks NX" column.
11878066055SKees Cook *
11978066055SKees Cook */
1206e0d6ac5SKees Cook #define compat_elf_read_implies_exec(ex, stk) (stk == EXSTACK_DEFAULT)
121f668cd16SCatalin Marinas
122f668cd16SCatalin Marinas #define CORE_DUMP_USE_REGSET
123f668cd16SCatalin Marinas #define ELF_EXEC_PAGESIZE PAGE_SIZE
124f668cd16SCatalin Marinas
125f668cd16SCatalin Marinas /*
12602445990SKees Cook * This is the base location for PIE (ET_DYN with INTERP) loads. On
127c715b72cSKees Cook * 64-bit, this is above 4GB to leave the entire 32-bit address
12802445990SKees Cook * space open for things that want to use the area for 32-bit pointers.
129f668cd16SCatalin Marinas */
130b9567720SSteve Capper #ifdef CONFIG_ARM64_FORCE_52BIT
131b9567720SSteve Capper #define ELF_ET_DYN_BASE (2 * TASK_SIZE_64 / 3)
132b9567720SSteve Capper #else
133363524d2SSteve Capper #define ELF_ET_DYN_BASE (2 * DEFAULT_MAP_WINDOW_64 / 3)
134b9567720SSteve Capper #endif /* CONFIG_ARM64_FORCE_52BIT */
135f668cd16SCatalin Marinas
1364a2e034eSArd Biesheuvel #ifndef __ASSEMBLY__
1374a2e034eSArd Biesheuvel
138ab7876a9SDave Martin #include <uapi/linux/elf.h>
13994b07c1fSDave Martin #include <linux/bug.h>
140ab7876a9SDave Martin #include <linux/errno.h>
141ab7876a9SDave Martin #include <linux/fs.h>
142ab7876a9SDave Martin #include <linux/types.h>
14394b07c1fSDave Martin #include <asm/processor.h> /* for signal_minsigstksz, used by ARCH_DLINFO */
14494b07c1fSDave Martin
1454a2e034eSArd Biesheuvel typedef unsigned long elf_greg_t;
1464a2e034eSArd Biesheuvel
1474a2e034eSArd Biesheuvel #define ELF_NGREG (sizeof(struct user_pt_regs) / sizeof(elf_greg_t))
1484a2e034eSArd Biesheuvel #define ELF_CORE_COPY_REGS(dest, regs) \
1494a2e034eSArd Biesheuvel *(struct user_pt_regs *)&(dest) = (regs)->user_regs;
1504a2e034eSArd Biesheuvel
1514a2e034eSArd Biesheuvel typedef elf_greg_t elf_gregset_t[ELF_NGREG];
1524a2e034eSArd Biesheuvel typedef struct user_fpsimd_state elf_fpregset_t;
1534a2e034eSArd Biesheuvel
154f668cd16SCatalin Marinas /*
155f668cd16SCatalin Marinas * When the program starts, a1 contains a pointer to a function to be
156f668cd16SCatalin Marinas * registered with atexit, as per the SVR4 ABI. A value of 0 means we have no
157f668cd16SCatalin Marinas * such handler.
158f668cd16SCatalin Marinas */
159f668cd16SCatalin Marinas #define ELF_PLAT_INIT(_r, load_addr) (_r)->regs[0] = 0
160f668cd16SCatalin Marinas
16106beb72fSPratyush Anand #define SET_PERSONALITY(ex) \
16206beb72fSPratyush Anand ({ \
16306beb72fSPratyush Anand clear_thread_flag(TIF_32BIT); \
16448f99c8eSDong Bo current->personality &= ~READ_IMPLIES_EXEC; \
16506beb72fSPratyush Anand })
166f668cd16SCatalin Marinas
1673146bc64SJames Hogan /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
168f668cd16SCatalin Marinas #define ARCH_DLINFO \
169f668cd16SCatalin Marinas do { \
170f668cd16SCatalin Marinas NEW_AUX_ENT(AT_SYSINFO_EHDR, \
171f668cd16SCatalin Marinas (elf_addr_t)current->mm->context.vdso); \
17294b07c1fSDave Martin \
17394b07c1fSDave Martin /* \
17494b07c1fSDave Martin * Should always be nonzero unless there's a kernel bug. \
17594b07c1fSDave Martin * If we haven't determined a sensible value to give to \
17694b07c1fSDave Martin * userspace, omit the entry: \
17794b07c1fSDave Martin */ \
17894b07c1fSDave Martin if (likely(signal_minsigstksz)) \
17994b07c1fSDave Martin NEW_AUX_ENT(AT_MINSIGSTKSZ, signal_minsigstksz); \
18094b07c1fSDave Martin else \
18194b07c1fSDave Martin NEW_AUX_ENT(AT_IGNORE, 0); \
182f668cd16SCatalin Marinas } while (0)
183f668cd16SCatalin Marinas
184f668cd16SCatalin Marinas #define ARCH_HAS_SETUP_ADDITIONAL_PAGES
185f668cd16SCatalin Marinas struct linux_binprm;
186f668cd16SCatalin Marinas extern int arch_setup_additional_pages(struct linux_binprm *bprm,
187f668cd16SCatalin Marinas int uses_interp);
188f668cd16SCatalin Marinas
189f668cd16SCatalin Marinas /* 1GB of VA */
190f668cd16SCatalin Marinas #ifdef CONFIG_COMPAT
191f668cd16SCatalin Marinas #define STACK_RND_MASK (test_thread_flag(TIF_32BIT) ? \
192f668cd16SCatalin Marinas 0x7ff >> (PAGE_SHIFT - 12) : \
193f668cd16SCatalin Marinas 0x3ffff >> (PAGE_SHIFT - 12))
194f668cd16SCatalin Marinas #else
195f668cd16SCatalin Marinas #define STACK_RND_MASK (0x3ffff >> (PAGE_SHIFT - 12))
196f668cd16SCatalin Marinas #endif
197f668cd16SCatalin Marinas
198a795a38eSWill Deacon #ifdef __AARCH64EB__
199a795a38eSWill Deacon #define COMPAT_ELF_PLATFORM ("v8b")
200a795a38eSWill Deacon #else
201f668cd16SCatalin Marinas #define COMPAT_ELF_PLATFORM ("v8l")
202a795a38eSWill Deacon #endif
203f668cd16SCatalin Marinas
204f668cd16SCatalin Marinas /* AArch32 registers. */
205f668cd16SCatalin Marinas #define COMPAT_ELF_NGREG 18
206f668cd16SCatalin Marinas typedef unsigned int compat_elf_greg_t;
207f668cd16SCatalin Marinas typedef compat_elf_greg_t compat_elf_gregset_t[COMPAT_ELF_NGREG];
208f668cd16SCatalin Marinas
209*1984c805SLeonardo Bras #ifdef CONFIG_COMPAT
210*1984c805SLeonardo Bras
211*1984c805SLeonardo Bras /* PIE load location for compat arm. Must match ARM ELF_ET_DYN_BASE. */
212*1984c805SLeonardo Bras #define COMPAT_ELF_ET_DYN_BASE 0x000400000UL
213*1984c805SLeonardo Bras
214f668cd16SCatalin Marinas /* AArch32 EABI. */
215f668cd16SCatalin Marinas #define EF_ARM_EABI_MASK 0xff000000
21608cd8f41SWill Deacon int compat_elf_check_arch(const struct elf32_hdr *);
21708cd8f41SWill Deacon #define compat_elf_check_arch compat_elf_check_arch
218f668cd16SCatalin Marinas #define compat_start_thread compat_start_thread
21948f99c8eSDong Bo /*
2200c3039ffSBen Hutchings * Unlike the native SET_PERSONALITY macro, the compat version maintains
2210c3039ffSBen Hutchings * READ_IMPLIES_EXEC across an execve() since this is the behaviour on
22248f99c8eSDong Bo * arch/arm/.
22348f99c8eSDong Bo */
22406beb72fSPratyush Anand #define COMPAT_SET_PERSONALITY(ex) \
22506beb72fSPratyush Anand ({ \
22606beb72fSPratyush Anand set_thread_flag(TIF_32BIT); \
22706beb72fSPratyush Anand })
22885751e9eSVincenzo Frascino #ifdef CONFIG_COMPAT_VDSO
2291e3f17f5SVincenzo Frascino #define COMPAT_ARCH_DLINFO \
2301e3f17f5SVincenzo Frascino do { \
2311e3f17f5SVincenzo Frascino /* \
2321e3f17f5SVincenzo Frascino * Note that we use Elf64_Off instead of elf_addr_t because \
2331e3f17f5SVincenzo Frascino * elf_addr_t in compat is defined as Elf32_Addr and casting \
2341e3f17f5SVincenzo Frascino * current->mm->context.vdso to it triggers a cast warning of \
2351e3f17f5SVincenzo Frascino * cast from pointer to integer of different size. \
2361e3f17f5SVincenzo Frascino */ \
2371e3f17f5SVincenzo Frascino NEW_AUX_ENT(AT_SYSINFO_EHDR, \
2381e3f17f5SVincenzo Frascino (Elf64_Off)current->mm->context.vdso); \
2391e3f17f5SVincenzo Frascino } while (0)
2401e3f17f5SVincenzo Frascino #else
241f668cd16SCatalin Marinas #define COMPAT_ARCH_DLINFO
2421e3f17f5SVincenzo Frascino #endif
2430d747f65SVincenzo Frascino extern int aarch32_setup_additional_pages(struct linux_binprm *bprm,
244f668cd16SCatalin Marinas int uses_interp);
245f668cd16SCatalin Marinas #define compat_arch_setup_additional_pages \
2460d747f65SVincenzo Frascino aarch32_setup_additional_pages
247f668cd16SCatalin Marinas
248f668cd16SCatalin Marinas #endif /* CONFIG_COMPAT */
249f668cd16SCatalin Marinas
250ab7876a9SDave Martin struct arch_elf_state {
251ab7876a9SDave Martin int flags;
252ab7876a9SDave Martin };
253ab7876a9SDave Martin
254ab7876a9SDave Martin #define ARM64_ELF_BTI (1 << 0)
255ab7876a9SDave Martin
256ab7876a9SDave Martin #define INIT_ARCH_ELF_STATE { \
257ab7876a9SDave Martin .flags = 0, \
258ab7876a9SDave Martin }
259ab7876a9SDave Martin
arch_parse_elf_property(u32 type,const void * data,size_t datasz,bool compat,struct arch_elf_state * arch)260ab7876a9SDave Martin static inline int arch_parse_elf_property(u32 type, const void *data,
261ab7876a9SDave Martin size_t datasz, bool compat,
262ab7876a9SDave Martin struct arch_elf_state *arch)
263ab7876a9SDave Martin {
264ab7876a9SDave Martin /* No known properties for AArch32 yet */
265ab7876a9SDave Martin if (IS_ENABLED(CONFIG_COMPAT) && compat)
266ab7876a9SDave Martin return 0;
267ab7876a9SDave Martin
268ab7876a9SDave Martin if (type == GNU_PROPERTY_AARCH64_FEATURE_1_AND) {
269ab7876a9SDave Martin const u32 *p = data;
270ab7876a9SDave Martin
271ab7876a9SDave Martin if (datasz != sizeof(*p))
272ab7876a9SDave Martin return -ENOEXEC;
273ab7876a9SDave Martin
274ab7876a9SDave Martin if (system_supports_bti() &&
275ab7876a9SDave Martin (*p & GNU_PROPERTY_AARCH64_FEATURE_1_BTI))
276ab7876a9SDave Martin arch->flags |= ARM64_ELF_BTI;
277ab7876a9SDave Martin }
278ab7876a9SDave Martin
279ab7876a9SDave Martin return 0;
280ab7876a9SDave Martin }
281ab7876a9SDave Martin
arch_elf_pt_proc(void * ehdr,void * phdr,struct file * f,bool is_interp,struct arch_elf_state * state)282ab7876a9SDave Martin static inline int arch_elf_pt_proc(void *ehdr, void *phdr,
283ab7876a9SDave Martin struct file *f, bool is_interp,
284ab7876a9SDave Martin struct arch_elf_state *state)
285ab7876a9SDave Martin {
286ab7876a9SDave Martin return 0;
287ab7876a9SDave Martin }
288ab7876a9SDave Martin
arch_check_elf(void * ehdr,bool has_interp,void * interp_ehdr,struct arch_elf_state * state)289ab7876a9SDave Martin static inline int arch_check_elf(void *ehdr, bool has_interp,
290ab7876a9SDave Martin void *interp_ehdr,
291ab7876a9SDave Martin struct arch_elf_state *state)
292ab7876a9SDave Martin {
293ab7876a9SDave Martin return 0;
294ab7876a9SDave Martin }
295ab7876a9SDave Martin
2964a2e034eSArd Biesheuvel #endif /* !__ASSEMBLY__ */
2974a2e034eSArd Biesheuvel
298f668cd16SCatalin Marinas #endif
299