linux/arch/powerpc/include/asm/elf.h
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   1/*
   2 * ELF register definitions..
   3 *
   4 * This program is free software; you can redistribute it and/or
   5 * modify it under the terms of the GNU General Public License
   6 * as published by the Free Software Foundation; either version
   7 * 2 of the License, or (at your option) any later version.
   8 */
   9#ifndef _ASM_POWERPC_ELF_H
  10#define _ASM_POWERPC_ELF_H
  11
  12#include <linux/sched.h>        /* for task_struct */
  13#include <asm/page.h>
  14#include <asm/string.h>
  15#include <uapi/asm/elf.h>
  16
  17/*
  18 * This is used to ensure we don't load something for the wrong architecture.
  19 */
  20#define elf_check_arch(x) ((x)->e_machine == ELF_ARCH)
  21#define compat_elf_check_arch(x)        ((x)->e_machine == EM_PPC)
  22
  23#define CORE_DUMP_USE_REGSET
  24#define ELF_EXEC_PAGESIZE       PAGE_SIZE
  25
  26/* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
  27   use of this is to invoke "./ld.so someprog" to test out a new version of
  28   the loader.  We need to make sure that it is out of the way of the program
  29   that it will "exec", and that there is sufficient room for the brk.  */
  30
  31extern unsigned long randomize_et_dyn(unsigned long base);
  32#define ELF_ET_DYN_BASE         (randomize_et_dyn(0x20000000))
  33
  34/*
  35 * Our registers are always unsigned longs, whether we're a 32 bit
  36 * process or 64 bit, on either a 64 bit or 32 bit kernel.
  37 *
  38 * This macro relies on elf_regs[i] having the right type to truncate to,
  39 * either u32 or u64.  It defines the body of the elf_core_copy_regs
  40 * function, either the native one with elf_gregset_t elf_regs or
  41 * the 32-bit one with elf_gregset_t32 elf_regs.
  42 */
  43#define PPC_ELF_CORE_COPY_REGS(elf_regs, regs) \
  44        int i, nregs = min(sizeof(*regs) / sizeof(unsigned long), \
  45                           (size_t)ELF_NGREG);                    \
  46        for (i = 0; i < nregs; i++) \
  47                elf_regs[i] = ((unsigned long *) regs)[i]; \
  48        memset(&elf_regs[i], 0, (ELF_NGREG - i) * sizeof(elf_regs[0]))
  49
  50/* Common routine for both 32-bit and 64-bit native processes */
  51static inline void ppc_elf_core_copy_regs(elf_gregset_t elf_regs,
  52                                          struct pt_regs *regs)
  53{
  54        PPC_ELF_CORE_COPY_REGS(elf_regs, regs);
  55}
  56#define ELF_CORE_COPY_REGS(gregs, regs) ppc_elf_core_copy_regs(gregs, regs);
  57
  58typedef elf_vrregset_t elf_fpxregset_t;
  59
  60/* ELF_HWCAP yields a mask that user programs can use to figure out what
  61   instruction set this cpu supports.  This could be done in userspace,
  62   but it's not easy, and we've already done it here.  */
  63# define ELF_HWCAP      (cur_cpu_spec->cpu_user_features)
  64# define ELF_HWCAP2     (cur_cpu_spec->cpu_user_features2)
  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#define ELF_PLATFORM    (cur_cpu_spec->platform)
  71
  72/* While ELF_PLATFORM indicates the ISA supported by the platform, it
  73 * may not accurately reflect the underlying behavior of the hardware
  74 * (as in the case of running in Power5+ compatibility mode on a
  75 * Power6 machine).  ELF_BASE_PLATFORM allows ld.so to load libraries
  76 * that are tuned for the real hardware.
  77 */
  78#define ELF_BASE_PLATFORM (powerpc_base_platform)
  79
  80#ifdef __powerpc64__
  81# define ELF_PLAT_INIT(_r, load_addr)   do {    \
  82        _r->gpr[2] = load_addr;                 \
  83} while (0)
  84#endif /* __powerpc64__ */
  85
  86#ifdef __powerpc64__
  87# define SET_PERSONALITY(ex)                                    \
  88do {                                                            \
  89        if ((ex).e_ident[EI_CLASS] == ELFCLASS32)               \
  90                set_thread_flag(TIF_32BIT);                     \
  91        else                                                    \
  92                clear_thread_flag(TIF_32BIT);                   \
  93        if (personality(current->personality) != PER_LINUX32)   \
  94                set_personality(PER_LINUX |                     \
  95                        (current->personality & (~PER_MASK)));  \
  96} while (0)
  97/*
  98 * An executable for which elf_read_implies_exec() returns TRUE will
  99 * have the READ_IMPLIES_EXEC personality flag set automatically. This
 100 * is only required to work around bugs in old 32bit toolchains. Since
 101 * the 64bit ABI has never had these issues dont enable the workaround
 102 * even if we have an executable stack.
 103 */
 104# define elf_read_implies_exec(ex, exec_stk) (is_32bit_task() ? \
 105                (exec_stk == EXSTACK_DEFAULT) : 0)
 106#else 
 107# define elf_read_implies_exec(ex, exec_stk) (exec_stk == EXSTACK_DEFAULT)
 108#endif /* __powerpc64__ */
 109
 110extern int dcache_bsize;
 111extern int icache_bsize;
 112extern int ucache_bsize;
 113
 114/* vDSO has arch_setup_additional_pages */
 115#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
 116struct linux_binprm;
 117extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 118                                       int uses_interp);
 119#define VDSO_AUX_ENT(a,b) NEW_AUX_ENT(a,b)
 120
 121/* 1GB for 64bit, 8MB for 32bit */
 122#define STACK_RND_MASK (is_32bit_task() ? \
 123        (0x7ff >> (PAGE_SHIFT - 12)) : \
 124        (0x3ffff >> (PAGE_SHIFT - 12)))
 125
 126extern unsigned long arch_randomize_brk(struct mm_struct *mm);
 127#define arch_randomize_brk arch_randomize_brk
 128
 129
 130#ifdef CONFIG_SPU_BASE
 131/* Notes used in ET_CORE. Note name is "SPU/<fd>/<filename>". */
 132#define NT_SPU          1
 133
 134#define ARCH_HAVE_EXTRA_ELF_NOTES
 135
 136#endif /* CONFIG_SPU_BASE */
 137
 138#endif /* _ASM_POWERPC_ELF_H */
 139