include/asm-arm/elf.h

   1 #ifndef __ASMARM_ELF_H
   2 #define __ASMARM_ELF_H
   3
   4
   5 /*
   6  * ELF register definitions..
   7  */
   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 EM_ARM  40
  16 #define EF_ARM_APCS26 0x08
  17 #define EF_ARM_SOFT_FLOAT 0x200
  18 #define EF_ARM_EABI_MASK 0xFF000000
  19
  20 #define R_ARM_NONE      0
  21 #define R_ARM_PC24      1
  22 #define R_ARM_ABS32     2
  23 #define R_ARM_CALL      28
  24 #define R_ARM_JUMP24    29
  25
  26 #define ELF_NGREG (sizeof (struct pt_regs) / sizeof(elf_greg_t))
  27 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
  28
  29 typedef struct user_fp elf_fpregset_t;
  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 #ifdef __KERNEL__
  43 #include <asm/procinfo.h>
  44
  45 /*
  46  * This is used to ensure we don't load something for the wrong architecture.
  47  */
  48 #define elf_check_arch(x) ( ((x)->e_machine == EM_ARM) && (ELF_PROC_OK((x))) )
  49
  50 #define USE_ELF_CORE_DUMP
  51 #define ELF_EXEC_PAGESIZE       4096
  52
  53 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
  54    use of this is to invoke "./ld.so someprog" to test out a new version of
  55    the loader.  We need to make sure that it is out of the way of the program
  56    that it will "exec", and that there is sufficient room for the brk.  */
  57
  58 #define ELF_ET_DYN_BASE (2 * TASK_SIZE / 3)
  59
  60 /* When the program starts, a1 contains a pointer to a function to be
  61    registered with atexit, as per the SVR4 ABI.  A value of 0 means we
  62    have no such handler.  */
  63 #define ELF_PLAT_INIT(_r, load_addr)    (_r)->ARM_r0 = 0
  64
  65 /* This yields a mask that user programs can use to figure out what
  66    instruction set this cpu supports. */
  67
  68 #define ELF_HWCAP       (elf_hwcap)
  69
  70 /* This yields a string that ld.so will use to load implementation
  71    specific libraries for optimization.  This is more specific in
  72    intent than poking at uname or /proc/cpuinfo. */
  73
  74 /* For now we just provide a fairly general string that describes the
  75    processor family.  This could be made more specific later if someone
  76    implemented optimisations that require it.  26-bit CPUs give you
  77    "v1l" for ARM2 (no SWP) and "v2l" for anything else (ARM1 isn't
  78    supported).  32-bit CPUs give you "v3[lb]" for anything based on an
  79    ARM6 or ARM7 core and "armv4[lb]" for anything based on a StrongARM-1
  80    core.  */
  81
  82 #define ELF_PLATFORM_SIZE 8
  83 extern char elf_platform[];
  84 #define ELF_PLATFORM    (elf_platform)
  85
  86 /*
  87  * 32-bit code is always OK.  Some cpus can do 26-bit, some can't.
  88  */
  89 #define ELF_PROC_OK(x)  (ELF_THUMB_OK(x) && ELF_26BIT_OK(x))
  90
  91 #define ELF_THUMB_OK(x) \
  92         (( (elf_hwcap & HWCAP_THUMB) && ((x)->e_entry & 1) == 1) || \
  93          ((x)->e_entry & 3) == 0)
  94
  95 #define ELF_26BIT_OK(x) \
  96         (( (elf_hwcap & HWCAP_26BIT) && (x)->e_flags & EF_ARM_APCS26) || \
  97           ((x)->e_flags & EF_ARM_APCS26) == 0)
  98
  99 #ifndef CONFIG_IWMMXT
 100
 101 /* Old NetWinder binaries were compiled in such a way that the iBCS
 102    heuristic always trips on them.  Until these binaries become uncommon
 103    enough not to care, don't trust the `ibcs' flag here.  In any case
 104    there is no other ELF system currently supported by iBCS.
 105    @@ Could print a warning message to encourage users to upgrade.  */
 106 #define SET_PERSONALITY(ex,ibcs2) \
 107         set_personality(((ex).e_flags&EF_ARM_APCS26 ?PER_LINUX :PER_LINUX_32BIT))
 108
 109 #else
 110
 111 /*
 112  * All iWMMXt capable CPUs don't support 26-bit mode.  Yet they can run
 113  * legacy binaries which used to contain FPA11 floating point instructions
 114  * that have always been emulated by the kernel.  PFA11 and iWMMXt overlap
 115  * on coprocessor 1 space though.  We therefore must decide if given task
 116  * is allowed to use CP 0 and 1 for iWMMXt, or if they should be blocked
 117  * at all times for the prefetch exception handler to catch FPA11 opcodes
 118  * and emulate them.  The best indication to discriminate those two cases
 119  * is the SOFT_FLOAT flag in the ELF header.
 120  */
 121
 122 #define SET_PERSONALITY(ex,ibcs2) \
 123 do { \
 124         set_personality(PER_LINUX_32BIT); \
 125         if (((ex).e_flags & EF_ARM_EABI_MASK) || \
 126             ((ex).e_flags & EF_ARM_SOFT_FLOAT)) \
 127                 set_thread_flag(TIF_USING_IWMMXT); \
 128         else \
 129                 clear_thread_flag(TIF_USING_IWMMXT); \
 130 } while (0)
 131
 132 #endif
 133
 134 #endif
 135
 136 #endif