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 #ifdef __KERNEL
  12 #include <asm/procinfo.h>
  13 #endif
  14
  15 typedef unsigned long elf_greg_t;
  16 typedef unsigned long elf_freg_t[3];
  17
  18 #define EM_ARM  40
  19 #define EF_ARM_APCS26 0x08
  20 #define EF_ARM_SOFT_FLOAT 0x200
  21 #define EF_ARM_EABI_MASK 0xFF000000
  22
  23 #define R_ARM_NONE      0
  24 #define R_ARM_PC24      1
  25 #define R_ARM_ABS32     2
  26 #define R_ARM_CALL      28
  27 #define R_ARM_JUMP24    29
  28
  29 #define ELF_NGREG (sizeof (struct pt_regs) / sizeof(elf_greg_t))
  30 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
  31
  32 typedef struct user_fp elf_fpregset_t;
  33
  34 /*
  35  * This is used to ensure we don't load something for the wrong architecture.
  36  */
  37 #define elf_check_arch(x) ( ((x)->e_machine == EM_ARM) && (ELF_PROC_OK((x))) )
  38
  39 /*
  40  * These are used to set parameters in the core dumps.
  41  */
  42 #define ELF_CLASS       ELFCLASS32
  43 #ifdef __ARMEB__
  44 #define ELF_DATA        ELFDATA2MSB
  45 #else
  46 #define ELF_DATA        ELFDATA2LSB
  47 #endif
  48 #define ELF_ARCH        EM_ARM
  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 #ifdef __KERNEL__
  87
  88 /*
  89  * 32-bit code is always OK.  Some cpus can do 26-bit, some can't.
  90  */
  91 #define ELF_PROC_OK(x)  (ELF_THUMB_OK(x) && ELF_26BIT_OK(x))
  92
  93 #define ELF_THUMB_OK(x) \
  94         (( (elf_hwcap & HWCAP_THUMB) && ((x)->e_entry & 1) == 1) || \
  95          ((x)->e_entry & 3) == 0)
  96
  97 #define ELF_26BIT_OK(x) \
  98         (( (elf_hwcap & HWCAP_26BIT) && (x)->e_flags & EF_ARM_APCS26) || \
  99           ((x)->e_flags & EF_ARM_APCS26) == 0)
 100
 101 #ifndef CONFIG_IWMMXT
 102
 103 /* Old NetWinder binaries were compiled in such a way that the iBCS
 104    heuristic always trips on them.  Until these binaries become uncommon
 105    enough not to care, don't trust the `ibcs' flag here.  In any case
 106    there is no other ELF system currently supported by iBCS.
 107    @@ Could print a warning message to encourage users to upgrade.  */
 108 #define SET_PERSONALITY(ex,ibcs2) \
 109         set_personality(((ex).e_flags&EF_ARM_APCS26 ?PER_LINUX :PER_LINUX_32BIT))
 110
 111 #else
 112
 113 /*
 114  * All iWMMXt capable CPUs don't support 26-bit mode.  Yet they can run
 115  * legacy binaries which used to contain FPA11 floating point instructions
 116  * that have always been emulated by the kernel.  PFA11 and iWMMXt overlap
 117  * on coprocessor 1 space though.  We therefore must decide if given task
 118  * is allowed to use CP 0 and 1 for iWMMXt, or if they should be blocked
 119  * at all times for the prefetch exception handler to catch FPA11 opcodes
 120  * and emulate them.  The best indication to discriminate those two cases
 121  * is the SOFT_FLOAT flag in the ELF header.
 122  */
 123
 124 #define SET_PERSONALITY(ex,ibcs2) \
 125 do { \
 126         set_personality(PER_LINUX_32BIT); \
 127         if (((ex).e_flags & EF_ARM_EABI_MASK) || \
 128             ((ex).e_flags & EF_ARM_SOFT_FLOAT)) \
 129                 set_thread_flag(TIF_USING_IWMMXT); \
 130         else \
 131                 clear_thread_flag(TIF_USING_IWMMXT); \
 132 } while (0)
 133
 134 #endif
 135
 136 #endif
 137
 138 #endif