arch/arm/include/asm/elf.h

   1 #ifndef __ASMARM_ELF_H
   2 #define __ASMARM_ELF_H
   3
   4 #include <asm/hwcap.h>
   5
   6 /*
   7  * ELF register definitions..
   8  */
   9 #include <asm/ptrace.h>
  10 #include <asm/user.h>
  11
  12 typedef unsigned long elf_greg_t;
  13 typedef unsigned long elf_freg_t[3];
  14
  15 #define ELF_NGREG (sizeof (struct pt_regs) / sizeof(elf_greg_t))
  16 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
  17
  18 typedef struct user_fp elf_fpregset_t;
  19
  20 #define EM_ARM  40
  21 #define EF_ARM_APCS26 0x08
  22 #define EF_ARM_SOFT_FLOAT 0x200
  23 #define EF_ARM_EABI_MASK 0xFF000000
  24
  25 #define R_ARM_NONE      0
  26 #define R_ARM_PC24      1
  27 #define R_ARM_ABS32     2
  28 #define R_ARM_CALL      28
  29 #define R_ARM_JUMP24    29
  30
  31 /*
  32  * These are used to set parameters in the core dumps.
  33  */
  34 #define ELF_CLASS       ELFCLASS32
  35 #ifdef __ARMEB__
  36 #define ELF_DATA        ELFDATA2MSB
  37 #else
  38 #define ELF_DATA        ELFDATA2LSB
  39 #endif
  40 #define ELF_ARCH        EM_ARM
  41
  42 /*
  43  * This yields a string that ld.so will use to load implementation
  44  * specific libraries for optimization.  This is more specific in
  45  * intent than poking at uname or /proc/cpuinfo.
  46  *
  47  * For now we just provide a fairly general string that describes the
  48  * processor family.  This could be made more specific later if someone
  49  * implemented optimisations that require it.  26-bit CPUs give you
  50  * "v1l" for ARM2 (no SWP) and "v2l" for anything else (ARM1 isn't
  51  * supported).  32-bit CPUs give you "v3[lb]" for anything based on an
  52  * ARM6 or ARM7 core and "armv4[lb]" for anything based on a StrongARM-1
  53  * core.
  54  */
  55 #define ELF_PLATFORM_SIZE 8
  56 #define ELF_PLATFORM    (elf_platform)
  57
  58 extern char elf_platform[];
  59
  60 /*
  61  * This is used to ensure we don't load something for the wrong architecture.
  62  */
  63 #define elf_check_arch(x) ((x)->e_machine == EM_ARM && ELF_PROC_OK(x))
  64
  65 /*
  66  * 32-bit code is always OK.  Some cpus can do 26-bit, some can't.
  67  */
  68 #define ELF_PROC_OK(x)  (ELF_THUMB_OK(x) && ELF_26BIT_OK(x))
  69
  70 #define ELF_THUMB_OK(x) \
  71         ((elf_hwcap & HWCAP_THUMB && ((x)->e_entry & 1) == 1) || \
  72          ((x)->e_entry & 3) == 0)
  73
  74 #define ELF_26BIT_OK(x) \
  75         ((elf_hwcap & HWCAP_26BIT && (x)->e_flags & EF_ARM_APCS26) || \
  76           ((x)->e_flags & EF_ARM_APCS26) == 0)
  77
  78 #define USE_ELF_CORE_DUMP
  79 #define ELF_EXEC_PAGESIZE       4096
  80
  81 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
  82    use of this is to invoke "./ld.so someprog" to test out a new version of
  83    the loader.  We need to make sure that it is out of the way of the program
  84    that it will "exec", and that there is sufficient room for the brk.  */
  85
  86 #define ELF_ET_DYN_BASE (2 * TASK_SIZE / 3)
  87
  88 /* When the program starts, a1 contains a pointer to a function to be
  89    registered with atexit, as per the SVR4 ABI.  A value of 0 means we
  90    have no such handler.  */
  91 #define ELF_PLAT_INIT(_r, load_addr)    (_r)->ARM_r0 = 0
  92
  93 /*
  94  * Since the FPA coprocessor uses CP1 and CP2, and iWMMXt uses CP0
  95  * and CP1, we only enable access to the iWMMXt coprocessor if the
  96  * binary is EABI or softfloat (and thus, guaranteed not to use
  97  * FPA instructions.)
  98  */
  99 #define SET_PERSONALITY(ex, ibcs2)                                      \
 100         do {                                                            \
 101                 if ((ex).e_flags & EF_ARM_APCS26) {                     \
 102                         set_personality(PER_LINUX);                     \
 103                 } else {                                                \
 104                         set_personality(PER_LINUX_32BIT);               \
 105                         if (elf_hwcap & HWCAP_IWMMXT && (ex).e_flags & (EF_ARM_EABI_MASK | EF_ARM_SOFT_FLOAT)) \
 106                                 set_thread_flag(TIF_USING_IWMMXT);      \
 107                         else                                            \
 108                                 clear_thread_flag(TIF_USING_IWMMXT);    \
 109                 }                                                       \
 110         } while (0)
 111
 112 #endif