include/asm-arm/elf.h

   1 #ifndef __ASMARM_ELF_H
   2 #define __ASMARM_ELF_H
   3
   4 #ifndef __ASSEMBLY__
   5 /*
   6  * ELF register definitions..
   7  */
   8 #include <asm/ptrace.h>
   9 #include <asm/user.h>
  10
  11 typedef unsigned long elf_greg_t;
  12 typedef unsigned long elf_freg_t[3];
  13
  14 #define ELF_NGREG (sizeof (struct pt_regs) / sizeof(elf_greg_t))
  15 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
  16
  17 typedef struct user_fp elf_fpregset_t;
  18 #endif
  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  * HWCAP flags - for elf_hwcap (in kernel) and AT_HWCAP
  44  */
  45 #define HWCAP_SWP       1
  46 #define HWCAP_HALF      2
  47 #define HWCAP_THUMB     4
  48 #define HWCAP_26BIT     8       /* Play it safe */
  49 #define HWCAP_FAST_MULT 16
  50 #define HWCAP_FPA       32
  51 #define HWCAP_VFP       64
  52 #define HWCAP_EDSP      128
  53 #define HWCAP_JAVA      256
  54 #define HWCAP_IWMMXT    512
  55
  56 #ifdef __KERNEL__
  57 #ifndef __ASSEMBLY__
  58 /*
  59  * This yields a mask that user programs can use to figure out what
  60  * instruction set this cpu supports.
  61  */
  62 #define ELF_HWCAP       (elf_hwcap)
  63 extern unsigned int elf_hwcap;
  64
  65 /*
  66  * This yields a string that ld.so will use to load implementation
  67  * specific libraries for optimization.  This is more specific in
  68  * intent than poking at uname or /proc/cpuinfo.
  69  *
  70  * For now we just provide a fairly general string that describes the
  71  * processor family.  This could be made more specific later if someone
  72  * implemented optimisations that require it.  26-bit CPUs give you
  73  * "v1l" for ARM2 (no SWP) and "v2l" for anything else (ARM1 isn't
  74  * supported).  32-bit CPUs give you "v3[lb]" for anything based on an
  75  * ARM6 or ARM7 core and "armv4[lb]" for anything based on a StrongARM-1
  76  * core.
  77  */
  78 #define ELF_PLATFORM_SIZE 8
  79 #define ELF_PLATFORM    (elf_platform)
  80
  81 extern char elf_platform[];
  82 #endif
  83
  84 /*
  85  * This is used to ensure we don't load something for the wrong architecture.
  86  */
  87 #define elf_check_arch(x) ((x)->e_machine == EM_ARM && ELF_PROC_OK(x))
  88
  89 /*
  90  * 32-bit code is always OK.  Some cpus can do 26-bit, some can't.
  91  */
  92 #define ELF_PROC_OK(x)  (ELF_THUMB_OK(x) && ELF_26BIT_OK(x))
  93
  94 #define ELF_THUMB_OK(x) \
  95         ((elf_hwcap & HWCAP_THUMB && ((x)->e_entry & 1) == 1) || \
  96          ((x)->e_entry & 3) == 0)
  97
  98 #define ELF_26BIT_OK(x) \
  99         ((elf_hwcap & HWCAP_26BIT && (x)->e_flags & EF_ARM_APCS26) || \
 100           ((x)->e_flags & EF_ARM_APCS26) == 0)
 101
 102 #define USE_ELF_CORE_DUMP
 103 #define ELF_EXEC_PAGESIZE       4096
 104
 105 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
 106    use of this is to invoke "./ld.so someprog" to test out a new version of
 107    the loader.  We need to make sure that it is out of the way of the program
 108    that it will "exec", and that there is sufficient room for the brk.  */
 109
 110 #define ELF_ET_DYN_BASE (2 * TASK_SIZE / 3)
 111
 112 /* When the program starts, a1 contains a pointer to a function to be
 113    registered with atexit, as per the SVR4 ABI.  A value of 0 means we
 114    have no such handler.  */
 115 #define ELF_PLAT_INIT(_r, load_addr)    (_r)->ARM_r0 = 0
 116
 117 /*
 118  * Since the FPA coprocessor uses CP1 and CP2, and iWMMXt uses CP0
 119  * and CP1, we only enable access to the iWMMXt coprocessor if the
 120  * binary is EABI or softfloat (and thus, guaranteed not to use
 121  * FPA instructions.)
 122  */
 123 #define SET_PERSONALITY(ex, ibcs2)                                      \
 124         do {                                                            \
 125                 if ((ex).e_flags & EF_ARM_APCS26) {                     \
 126                         set_personality(PER_LINUX);                     \
 127                 } else {                                                \
 128                         set_personality(PER_LINUX_32BIT);               \
 129                         if (elf_hwcap & HWCAP_IWMMXT && (ex).e_flags & (EF_ARM_EABI_MASK | EF_ARM_SOFT_FLOAT)) \
 130                                 set_thread_flag(TIF_USING_IWMMXT);      \
 131                         else                                            \
 132                                 clear_thread_flag(TIF_USING_IWMMXT);    \
 133                 }                                                       \
 134         } while (0)
 135
 136 #endif
 137
 138 #endif