arch/powerpc/include/asm/elf.h

   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 /*
  27  * This is the base location for PIE (ET_DYN with INTERP) loads. On
  28  * 64-bit, this is raised to 4GB to leave the entire 32-bit address
  29  * space open for things that want to use the area for 32-bit pointers.
  30  */
  31 #define ELF_ET_DYN_BASE         (is_32bit_task() ? 0x000400000UL : \
  32                                                    0x100000000UL)
  33
  34 #define ELF_CORE_EFLAGS (is_elf2_task() ? 2 : 0)
  35
  36 /*
  37  * Our registers are always unsigned longs, whether we're a 32 bit
  38  * process or 64 bit, on either a 64 bit or 32 bit kernel.
  39  *
  40  * This macro relies on elf_regs[i] having the right type to truncate to,
  41  * either u32 or u64.  It defines the body of the elf_core_copy_regs
  42  * function, either the native one with elf_gregset_t elf_regs or
  43  * the 32-bit one with elf_gregset_t32 elf_regs.
  44  */
  45 #define PPC_ELF_CORE_COPY_REGS(elf_regs, regs) \
  46         int i, nregs = min(sizeof(*regs) / sizeof(unsigned long), \
  47                            (size_t)ELF_NGREG);                    \
  48         for (i = 0; i < nregs; i++) \
  49                 elf_regs[i] = ((unsigned long *) regs)[i]; \
  50         memset(&elf_regs[i], 0, (ELF_NGREG - i) * sizeof(elf_regs[0]))
  51
  52 /* Common routine for both 32-bit and 64-bit native processes */
  53 static inline void ppc_elf_core_copy_regs(elf_gregset_t elf_regs,
  54                                           struct pt_regs *regs)
  55 {
  56         PPC_ELF_CORE_COPY_REGS(elf_regs, regs);
  57 }
  58 #define ELF_CORE_COPY_REGS(gregs, regs) ppc_elf_core_copy_regs(gregs, regs);
  59
  60 typedef elf_vrregset_t elf_fpxregset_t;
  61
  62 /* ELF_HWCAP yields a mask that user programs can use to figure out what
  63    instruction set this cpu supports.  This could be done in userspace,
  64    but it's not easy, and we've already done it here.  */
  65 # define ELF_HWCAP      (cur_cpu_spec->cpu_user_features)
  66 # define ELF_HWCAP2     (cur_cpu_spec->cpu_user_features2)
  67
  68 /* This yields a string that ld.so will use to load implementation
  69    specific libraries for optimization.  This is more specific in
  70    intent than poking at uname or /proc/cpuinfo.  */
  71
  72 #define ELF_PLATFORM    (cur_cpu_spec->platform)
  73
  74 /* While ELF_PLATFORM indicates the ISA supported by the platform, it
  75  * may not accurately reflect the underlying behavior of the hardware
  76  * (as in the case of running in Power5+ compatibility mode on a
  77  * Power6 machine).  ELF_BASE_PLATFORM allows ld.so to load libraries
  78  * that are tuned for the real hardware.
  79  */
  80 #define ELF_BASE_PLATFORM (powerpc_base_platform)
  81
  82 #ifdef __powerpc64__
  83 # define ELF_PLAT_INIT(_r, load_addr)   do {    \
  84         _r->gpr[2] = load_addr;                 \
  85 } while (0)
  86 #endif /* __powerpc64__ */
  87
  88 #ifdef __powerpc64__
  89 # define SET_PERSONALITY(ex)                                    \
  90 do {                                                            \
  91         if (((ex).e_flags & 0x3) == 2)                          \
  92                 set_thread_flag(TIF_ELF2ABI);                   \
  93         else                                                    \
  94                 clear_thread_flag(TIF_ELF2ABI);                 \
  95         if ((ex).e_ident[EI_CLASS] == ELFCLASS32)               \
  96                 set_thread_flag(TIF_32BIT);                     \
  97         else                                                    \
  98                 clear_thread_flag(TIF_32BIT);                   \
  99         if (personality(current->personality) != PER_LINUX32)   \
 100                 set_personality(PER_LINUX |                     \
 101                         (current->personality & (~PER_MASK)));  \
 102 } while (0)
 103 /*
 104  * An executable for which elf_read_implies_exec() returns TRUE will
 105  * have the READ_IMPLIES_EXEC personality flag set automatically. This
 106  * is only required to work around bugs in old 32bit toolchains. Since
 107  * the 64bit ABI has never had these issues dont enable the workaround
 108  * even if we have an executable stack.
 109  */
 110 # define elf_read_implies_exec(ex, exec_stk) (is_32bit_task() ? \
 111                 (exec_stk == EXSTACK_DEFAULT) : 0)
 112 #else
 113 # define elf_read_implies_exec(ex, exec_stk) (exec_stk == EXSTACK_DEFAULT)
 114 #endif /* __powerpc64__ */
 115
 116 extern int dcache_bsize;
 117 extern int icache_bsize;
 118 extern int ucache_bsize;
 119
 120 /* vDSO has arch_setup_additional_pages */
 121 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES
 122 struct linux_binprm;
 123 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 124                                        int uses_interp);
 125 #define VDSO_AUX_ENT(a,b) NEW_AUX_ENT(a,b)
 126
 127 /* 1GB for 64bit, 8MB for 32bit */
 128 #define STACK_RND_MASK (is_32bit_task() ? \
 129         (0x7ff >> (PAGE_SHIFT - 12)) : \
 130         (0x3ffff >> (PAGE_SHIFT - 12)))
 131
 132 #ifdef CONFIG_SPU_BASE
 133 /* Notes used in ET_CORE. Note name is "SPU/<fd>/<filename>". */
 134 #define NT_SPU          1
 135
 136 #define ARCH_HAVE_EXTRA_ELF_NOTES
 137
 138 #endif /* CONFIG_SPU_BASE */
 139
 140 #ifdef CONFIG_PPC64
 141
 142 #define get_cache_geometry(level) \
 143         (ppc64_caches.level.assoc << 16 | ppc64_caches.level.line_size)
 144
 145 #define ARCH_DLINFO_CACHE_GEOMETRY                                      \
 146         NEW_AUX_ENT(AT_L1I_CACHESIZE, ppc64_caches.l1i.size);           \
 147         NEW_AUX_ENT(AT_L1I_CACHEGEOMETRY, get_cache_geometry(l1i));     \
 148         NEW_AUX_ENT(AT_L1D_CACHESIZE, ppc64_caches.l1d.size);           \
 149         NEW_AUX_ENT(AT_L1D_CACHEGEOMETRY, get_cache_geometry(l1d));     \
 150         NEW_AUX_ENT(AT_L2_CACHESIZE, ppc64_caches.l2.size);             \
 151         NEW_AUX_ENT(AT_L2_CACHEGEOMETRY, get_cache_geometry(l2));       \
 152         NEW_AUX_ENT(AT_L3_CACHESIZE, ppc64_caches.l3.size);             \
 153         NEW_AUX_ENT(AT_L3_CACHEGEOMETRY, get_cache_geometry(l3))
 154
 155 #else
 156 #define ARCH_DLINFO_CACHE_GEOMETRY
 157 #endif
 158
 159 /*
 160  * The requirements here are:
 161  * - keep the final alignment of sp (sp & 0xf)
 162  * - make sure the 32-bit value at the first 16 byte aligned position of
 163  *   AUXV is greater than 16 for glibc compatibility.
 164  *   AT_IGNOREPPC is used for that.
 165  * - for compatibility with glibc ARCH_DLINFO must always be defined on PPC,
 166  *   even if DLINFO_ARCH_ITEMS goes to zero or is undefined.
 167  * update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes
 168  */
 169 #define ARCH_DLINFO                                                     \
 170 do {                                                                    \
 171         /* Handle glibc compatibility. */                               \
 172         NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC);                        \
 173         NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC);                        \
 174         /* Cache size items */                                          \
 175         NEW_AUX_ENT(AT_DCACHEBSIZE, dcache_bsize);                      \
 176         NEW_AUX_ENT(AT_ICACHEBSIZE, icache_bsize);                      \
 177         NEW_AUX_ENT(AT_UCACHEBSIZE, ucache_bsize);                      \
 178         VDSO_AUX_ENT(AT_SYSINFO_EHDR, current->mm->context.vdso_base);  \
 179         ARCH_DLINFO_CACHE_GEOMETRY;                                     \
 180 } while (0)
 181
 182 #endif /* _ASM_POWERPC_ELF_H */