include/asm-arm/elf.h

   1 #ifndef __ASMARM_ELF_H
   2 #define __ASMARM_ELF_H
   3
   4 #include <linux/config.h>
   5
   6 /*
   7  * ELF register definitions..
   8  */
   9
  10 #include <asm/ptrace.h>
  11 #include <asm/user.h>
  12 #include <asm/procinfo.h>
  13
  14 typedef unsigned long elf_greg_t;
  15 typedef unsigned long elf_freg_t[3];
  16
  17 #define EM_ARM  40
  18 #define EF_ARM_APCS26 0x08
  19 #define EF_ARM_SOFT_FLOAT 0x200
  20 #define EF_ARM_EABI_MASK 0xFF000000
  21
  22 #define R_ARM_NONE      0
  23 #define R_ARM_PC24      1
  24 #define R_ARM_ABS32     2
  25 #define R_ARM_CALL      28
  26 #define R_ARM_JUMP24    29
  27
  28 #define ELF_NGREG (sizeof (struct pt_regs) / sizeof(elf_greg_t))
  29 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
  30
  31 typedef struct user_fp elf_fpregset_t;
  32
  33 /*
  34  * This is used to ensure we don't load something for the wrong architecture.
  35  */
  36 #define elf_check_arch(x) ( ((x)->e_machine == EM_ARM) && (ELF_PROC_OK((x))) )
  37
  38 /*
  39  * These are used to set parameters in the core dumps.
  40  */
  41 #define ELF_CLASS       ELFCLASS32
  42 #ifdef __ARMEB__
  43 #define ELF_DATA        ELFDATA2MSB
  44 #else
  45 #define ELF_DATA        ELFDATA2LSB
  46 #endif
  47 #define ELF_ARCH        EM_ARM
  48
  49 #define USE_ELF_CORE_DUMP
  50 #define ELF_EXEC_PAGESIZE       4096
  51
  52 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
  53    use of this is to invoke "./ld.so someprog" to test out a new version of
  54    the loader.  We need to make sure that it is out of the way of the program
  55    that it will "exec", and that there is sufficient room for the brk.  */
  56
  57 #define ELF_ET_DYN_BASE (2 * TASK_SIZE / 3)
  58
  59 /* When the program starts, a1 contains a pointer to a function to be
  60    registered with atexit, as per the SVR4 ABI.  A value of 0 means we
  61    have no such handler.  */
  62 #define ELF_PLAT_INIT(_r, load_addr)    (_r)->ARM_r0 = 0
  63
  64 /* This yields a mask that user programs can use to figure out what
  65    instruction set this cpu supports. */
  66
  67 #define ELF_HWCAP       (elf_hwcap)
  68
  69 /* This yields a string that ld.so will use to load implementation
  70    specific libraries for optimization.  This is more specific in
  71    intent than poking at uname or /proc/cpuinfo. */
  72
  73 /* For now we just provide a fairly general string that describes the
  74    processor family.  This could be made more specific later if someone
  75    implemented optimisations that require it.  26-bit CPUs give you
  76    "v1l" for ARM2 (no SWP) and "v2l" for anything else (ARM1 isn't
  77    supported).  32-bit CPUs give you "v3[lb]" for anything based on an
  78    ARM6 or ARM7 core and "armv4[lb]" for anything based on a StrongARM-1
  79    core.  */
  80
  81 #define ELF_PLATFORM_SIZE 8
  82 extern char elf_platform[];
  83 #define ELF_PLATFORM    (elf_platform)
  84
  85 #ifdef __KERNEL__
  86
  87 /*
  88  * 32-bit code is always OK.  Some cpus can do 26-bit, some can't.
  89  */
  90 #define ELF_PROC_OK(x)  (ELF_THUMB_OK(x) && ELF_26BIT_OK(x))
  91
  92 #define ELF_THUMB_OK(x) \
  93         (( (elf_hwcap & HWCAP_THUMB) && ((x)->e_entry & 1) == 1) || \
  94          ((x)->e_entry & 3) == 0)
  95
  96 #define ELF_26BIT_OK(x) \
  97         (( (elf_hwcap & HWCAP_26BIT) && (x)->e_flags & EF_ARM_APCS26) || \
  98           ((x)->e_flags & EF_ARM_APCS26) == 0)
  99
 100 #ifndef CONFIG_IWMMXT
 101
 102 /* Old NetWinder binaries were compiled in such a way that the iBCS
 103    heuristic always trips on them.  Until these binaries become uncommon
 104    enough not to care, don't trust the `ibcs' flag here.  In any case
 105    there is no other ELF system currently supported by iBCS.
 106    @@ Could print a warning message to encourage users to upgrade.  */
 107 #define SET_PERSONALITY(ex,ibcs2) \
 108         set_personality(((ex).e_flags&EF_ARM_APCS26 ?PER_LINUX :PER_LINUX_32BIT))
 109
 110 #else
 111
 112 /*
 113  * All iWMMXt capable CPUs don't support 26-bit mode.  Yet they can run
 114  * legacy binaries which used to contain FPA11 floating point instructions
 115  * that have always been emulated by the kernel.  PFA11 and iWMMXt overlap
 116  * on coprocessor 1 space though.  We therefore must decide if given task
 117  * is allowed to use CP 0 and 1 for iWMMXt, or if they should be blocked
 118  * at all times for the prefetch exception handler to catch FPA11 opcodes
 119  * and emulate them.  The best indication to discriminate those two cases
 120  * is the SOFT_FLOAT flag in the ELF header.
 121  */
 122
 123 #define SET_PERSONALITY(ex,ibcs2) \
 124 do { \
 125         set_personality(PER_LINUX_32BIT); \
 126         if (((ex).e_flags & EF_ARM_EABI_MASK) || \
 127             ((ex).e_flags & EF_ARM_SOFT_FLOAT)) \
 128                 set_thread_flag(TIF_USING_IWMMXT); \
 129         else \
 130                 clear_thread_flag(TIF_USING_IWMMXT); \
 131 } while (0)
 132
 133 #endif
 134
 135 #endif
 136
 137 #endif