Line data    Source code

       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             : int 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                                              \
     230             : do {                                                                    \
     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
     243             : extern 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             : 
     250             : struct 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             : 
     260           0 : static 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           0 :         if (IS_ENABLED(CONFIG_COMPAT) && compat)
     266             :                 return 0;
     267             : 
     268           0 :         if (type == GNU_PROPERTY_AARCH64_FEATURE_1_AND) {
     269           0 :                 const u32 *p = data;
     270             : 
     271           0 :                 if (datasz != sizeof(*p))
     272             :                         return -ENOEXEC;
     273             : 
     274           0 :                 if (system_supports_bti() &&
     275           0 :                     (*p & GNU_PROPERTY_AARCH64_FEATURE_1_BTI))
     276           0 :                         arch->flags |= ARM64_ELF_BTI;
     277             :         }
     278             : 
     279             :         return 0;
     280             : }
     281             : 
     282             : static 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             : 
     289             : static 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