include/asm-x86_64/elf.h

   1 #ifndef __ASM_X86_64_ELF_H
   2 #define __ASM_X86_64_ELF_H
   3
   4 /*
   5  * ELF register definitions..
   6  */
   7
   8 #include <asm/ptrace.h>
   9 #include <asm/user.h>
  10 #include <asm/processor.h>
  11 #include <asm/compat.h>
  12
  13 /* x86-64 relocation types */
  14 #define R_X86_64_NONE           0       /* No reloc */
  15 #define R_X86_64_64             1       /* Direct 64 bit  */
  16 #define R_X86_64_PC32           2       /* PC relative 32 bit signed */
  17 #define R_X86_64_GOT32          3       /* 32 bit GOT entry */
  18 #define R_X86_64_PLT32          4       /* 32 bit PLT address */
  19 #define R_X86_64_COPY           5       /* Copy symbol at runtime */
  20 #define R_X86_64_GLOB_DAT       6       /* Create GOT entry */
  21 #define R_X86_64_JUMP_SLOT      7       /* Create PLT entry */
  22 #define R_X86_64_RELATIVE       8       /* Adjust by program base */
  23 #define R_X86_64_GOTPCREL       9       /* 32 bit signed pc relative
  24                                            offset to GOT */
  25 #define R_X86_64_32             10      /* Direct 32 bit zero extended */
  26 #define R_X86_64_32S            11      /* Direct 32 bit sign extended */
  27 #define R_X86_64_16             12      /* Direct 16 bit zero extended */
  28 #define R_X86_64_PC16           13      /* 16 bit sign extended pc relative */
  29 #define R_X86_64_8              14      /* Direct 8 bit sign extended  */
  30 #define R_X86_64_PC8            15      /* 8 bit sign extended pc relative */
  31
  32 #define R_X86_64_NUM            16
  33
  34 typedef unsigned long elf_greg_t;
  35
  36 #define ELF_NGREG (sizeof (struct user_regs_struct) / sizeof(elf_greg_t))
  37 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
  38
  39 typedef struct user_i387_struct elf_fpregset_t;
  40
  41 /*
  42  * This is used to ensure we don't load something for the wrong architecture.
  43  */
  44 #define elf_check_arch(x) \
  45         ((x)->e_machine == EM_X86_64)
  46
  47 /*
  48  * These are used to set parameters in the core dumps.
  49  */
  50 #define ELF_CLASS       ELFCLASS64
  51 #define ELF_DATA        ELFDATA2LSB
  52 #define ELF_ARCH        EM_X86_64
  53
  54 /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program starts %edx
  55    contains a pointer to a function which might be registered using `atexit'.
  56    This provides a mean for the dynamic linker to call DT_FINI functions for
  57    shared libraries that have been loaded before the code runs.
  58
  59    A value of 0 tells we have no such handler.
  60
  61    We might as well make sure everything else is cleared too (except for %esp),
  62    just to make things more deterministic.
  63  */
  64 #define ELF_PLAT_INIT(_r, load_addr)    do { \
  65         struct task_struct *cur = current; \
  66         (_r)->rbx = 0; (_r)->rcx = 0; (_r)->rdx = 0; \
  67         (_r)->rsi = 0; (_r)->rdi = 0; (_r)->rbp = 0; \
  68         (_r)->rax = 0;                          \
  69         (_r)->r8 = 0;                           \
  70         (_r)->r9 = 0;                           \
  71         (_r)->r10 = 0;                          \
  72         (_r)->r11 = 0;                          \
  73         (_r)->r12 = 0;                          \
  74         (_r)->r13 = 0;                          \
  75         (_r)->r14 = 0;                          \
  76         (_r)->r15 = 0;                          \
  77         cur->thread.fs = 0; cur->thread.gs = 0; \
  78         cur->thread.fsindex = 0; cur->thread.gsindex = 0; \
  79         cur->thread.ds = 0; cur->thread.es = 0;  \
  80         clear_thread_flag(TIF_IA32); \
  81 } while (0)
  82
  83 #define USE_ELF_CORE_DUMP
  84 #define ELF_EXEC_PAGESIZE       4096
  85
  86 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
  87    use of this is to invoke "./ld.so someprog" to test out a new version of
  88    the loader.  We need to make sure that it is out of the way of the program
  89    that it will "exec", and that there is sufficient room for the brk.  */
  90
  91 #define ELF_ET_DYN_BASE         (2 * TASK_SIZE / 3)
  92
  93 /* regs is struct pt_regs, pr_reg is elf_gregset_t (which is
  94    now struct_user_regs, they are different). Assumes current is the process
  95    getting dumped. */
  96
  97 #define ELF_CORE_COPY_REGS(pr_reg, regs)  do { \
  98         unsigned v;                                             \
  99         (pr_reg)[0] = (regs)->r15;                              \
 100         (pr_reg)[1] = (regs)->r14;                              \
 101         (pr_reg)[2] = (regs)->r13;                              \
 102         (pr_reg)[3] = (regs)->r12;                              \
 103         (pr_reg)[4] = (regs)->rbp;                              \
 104         (pr_reg)[5] = (regs)->rbx;                              \
 105         (pr_reg)[6] = (regs)->r11;                              \
 106         (pr_reg)[7] = (regs)->r10;                              \
 107         (pr_reg)[8] = (regs)->r9;                               \
 108         (pr_reg)[9] = (regs)->r8;                               \
 109         (pr_reg)[10] = (regs)->rax;                             \
 110         (pr_reg)[11] = (regs)->rcx;                             \
 111         (pr_reg)[12] = (regs)->rdx;                             \
 112         (pr_reg)[13] = (regs)->rsi;                             \
 113         (pr_reg)[14] = (regs)->rdi;                             \
 114         (pr_reg)[15] = (regs)->orig_rax;                        \
 115         (pr_reg)[16] = (regs)->rip;                     \
 116         (pr_reg)[17] = (regs)->cs;                      \
 117         (pr_reg)[18] = (regs)->eflags;                  \
 118         (pr_reg)[19] = (regs)->rsp;                     \
 119         (pr_reg)[20] = (regs)->ss;                      \
 120         (pr_reg)[21] = current->thread.fs;                      \
 121         (pr_reg)[22] = current->thread.gs;                      \
 122         asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v;       \
 123         asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v;       \
 124         asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v;       \
 125         asm("movl %%gs,%0" : "=r" (v)); (pr_reg)[26] = v;       \
 126 } while(0);
 127
 128 /* This yields a mask that user programs can use to figure out what
 129    instruction set this CPU supports.  This could be done in user space,
 130    but it's not easy, and we've already done it here.  */
 131
 132 #define ELF_HWCAP       (boot_cpu_data.x86_capability[0])
 133
 134 /* This yields a string that ld.so will use to load implementation
 135    specific libraries for optimization.  This is more specific in
 136    intent than poking at uname or /proc/cpuinfo.
 137
 138    For the moment, we have only optimizations for the Intel generations,
 139    but that could change... */
 140
 141 /* I'm not sure if we can use '-' here */
 142 #define ELF_PLATFORM  ("x86_64")
 143
 144 #ifdef __KERNEL__
 145 extern void set_personality_64bit(void);
 146 #define SET_PERSONALITY(ex, ibcs2) set_personality_64bit()
 147 /*
 148  * An executable for which elf_read_implies_exec() returns TRUE will
 149  * have the READ_IMPLIES_EXEC personality flag set automatically.
 150  */
 151 #define elf_read_implies_exec(ex, executable_stack)     (executable_stack != EXSTACK_DISABLE_X)
 152
 153 struct task_struct;
 154
 155 extern int dump_task_regs (struct task_struct *, elf_gregset_t *);
 156 extern int dump_task_fpu (struct task_struct *, elf_fpregset_t *);
 157
 158 #define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs)
 159 #define ELF_CORE_COPY_FPREGS(tsk, elf_fpregs) dump_task_fpu(tsk, elf_fpregs)
 160
 161 /* 1GB for 64bit, 8MB for 32bit */
 162 #define STACK_RND_MASK (is_compat_task() ? 0x7ff : 0x3fffff)
 163
 164 #endif
 165
 166 #endif