include/asm-arm/elf.h

   1 #ifndef __ASMARM_ELF_H
   2 #define __ASMARM_ELF_H
   3
   4 #include <asm/hwcap.h>
   5
   6 #ifndef __ASSEMBLY__
   7 /*
   8  * ELF register definitions..
   9  */
  10 #include <asm/ptrace.h>
  11 #include <asm/user.h>
  12
  13 typedef unsigned long elf_greg_t;
  14 typedef unsigned long elf_freg_t[3];
  15
  16 #define ELF_NGREG (sizeof (struct pt_regs) / sizeof(elf_greg_t))
  17 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
  18
  19 typedef struct user_fp elf_fpregset_t;
  20 #endif
  21
  22 #define EM_ARM  40
  23 #define EF_ARM_APCS26 0x08
  24 #define EF_ARM_SOFT_FLOAT 0x200
  25 #define EF_ARM_EABI_MASK 0xFF000000
  26
  27 #define R_ARM_NONE      0
  28 #define R_ARM_PC24      1
  29 #define R_ARM_ABS32     2
  30 #define R_ARM_CALL      28
  31 #define R_ARM_JUMP24    29
  32
  33 /*
  34  * These are used to set parameters in the core dumps.
  35  */
  36 #define ELF_CLASS       ELFCLASS32
  37 #ifdef __ARMEB__
  38 #define ELF_DATA        ELFDATA2MSB
  39 #else
  40 #define ELF_DATA        ELFDATA2LSB
  41 #endif
  42 #define ELF_ARCH        EM_ARM
  43
  44 #ifndef __ASSEMBLY__
  45 /*
  46  * This yields a string that ld.so will use to load implementation
  47  * specific libraries for optimization.  This is more specific in
  48  * intent than poking at uname or /proc/cpuinfo.
  49  *
  50  * For now we just provide a fairly general string that describes the
  51  * processor family.  This could be made more specific later if someone
  52  * implemented optimisations that require it.  26-bit CPUs give you
  53  * "v1l" for ARM2 (no SWP) and "v2l" for anything else (ARM1 isn't
  54  * supported).  32-bit CPUs give you "v3[lb]" for anything based on an
  55  * ARM6 or ARM7 core and "armv4[lb]" for anything based on a StrongARM-1
  56  * core.
  57  */
  58 #define ELF_PLATFORM_SIZE 8
  59 #define ELF_PLATFORM    (elf_platform)
  60
  61 extern char elf_platform[];
  62 #endif
  63
  64 /*
  65  * This is used to ensure we don't load something for the wrong architecture.
  66  */
  67 #define elf_check_arch(x) ((x)->e_machine == EM_ARM && ELF_PROC_OK(x))
  68
  69 /*
  70  * 32-bit code is always OK.  Some cpus can do 26-bit, some can't.
  71  */
  72 #define ELF_PROC_OK(x)  (ELF_THUMB_OK(x) && ELF_26BIT_OK(x))
  73
  74 #define ELF_THUMB_OK(x) \
  75         ((elf_hwcap & HWCAP_THUMB && ((x)->e_entry & 1) == 1) || \
  76          ((x)->e_entry & 3) == 0)
  77
  78 #define ELF_26BIT_OK(x) \
  79         ((elf_hwcap & HWCAP_26BIT && (x)->e_flags & EF_ARM_APCS26) || \
  80           ((x)->e_flags & EF_ARM_APCS26) == 0)
  81
  82 #define USE_ELF_CORE_DUMP
  83 #define ELF_EXEC_PAGESIZE       4096
  84
  85 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
  86    use of this is to invoke "./ld.so someprog" to test out a new version of
  87    the loader.  We need to make sure that it is out of the way of the program
  88    that it will "exec", and that there is sufficient room for the brk.  */
  89
  90 #define ELF_ET_DYN_BASE (2 * TASK_SIZE / 3)
  91
  92 /* When the program starts, a1 contains a pointer to a function to be
  93    registered with atexit, as per the SVR4 ABI.  A value of 0 means we
  94    have no such handler.  */
  95 #define ELF_PLAT_INIT(_r, load_addr)    (_r)->ARM_r0 = 0
  96
  97 /*
  98  * Since the FPA coprocessor uses CP1 and CP2, and iWMMXt uses CP0
  99  * and CP1, we only enable access to the iWMMXt coprocessor if the
 100  * binary is EABI or softfloat (and thus, guaranteed not to use
 101  * FPA instructions.)
 102  */
 103 #define SET_PERSONALITY(ex, ibcs2)                                      \
 104         do {                                                            \
 105                 if ((ex).e_flags & EF_ARM_APCS26) {                     \
 106                         set_personality(PER_LINUX);                     \
 107                 } else {                                                \
 108                         set_personality(PER_LINUX_32BIT);               \
 109                         if (elf_hwcap & HWCAP_IWMMXT && (ex).e_flags & (EF_ARM_EABI_MASK | EF_ARM_SOFT_FLOAT)) \
 110                                 set_thread_flag(TIF_USING_IWMMXT);      \
 111                         else                                            \
 112                                 clear_thread_flag(TIF_USING_IWMMXT);    \
 113                 }                                                       \
 114         } while (0)
 115
 116 #endif