arch/um/sys-i386/asm/elf.h

   1 /*
   2  * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   3  * Licensed under the GPL
   4  */
   5 #ifndef __UM_ELF_I386_H
   6 #define __UM_ELF_I386_H
   7
   8 #include <asm/user.h>
   9 #include "skas.h"
  10
  11 #define R_386_NONE      0
  12 #define R_386_32        1
  13 #define R_386_PC32      2
  14 #define R_386_GOT32     3
  15 #define R_386_PLT32     4
  16 #define R_386_COPY      5
  17 #define R_386_GLOB_DAT  6
  18 #define R_386_JMP_SLOT  7
  19 #define R_386_RELATIVE  8
  20 #define R_386_GOTOFF    9
  21 #define R_386_GOTPC     10
  22 #define R_386_NUM       11
  23
  24 typedef unsigned long elf_greg_t;
  25
  26 #define ELF_NGREG (sizeof (struct user_regs_struct) / sizeof(elf_greg_t))
  27 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
  28
  29 typedef struct user_i387_struct elf_fpregset_t;
  30
  31 /*
  32  * This is used to ensure we don't load something for the wrong architecture.
  33  */
  34 #define elf_check_arch(x) \
  35         (((x)->e_machine == EM_386) || ((x)->e_machine == EM_486))
  36
  37 #define ELF_CLASS       ELFCLASS32
  38 #define ELF_DATA        ELFDATA2LSB
  39 #define ELF_ARCH        EM_386
  40
  41 #define ELF_PLAT_INIT(regs, load_addr) do { \
  42         PT_REGS_EBX(regs) = 0; \
  43         PT_REGS_ECX(regs) = 0; \
  44         PT_REGS_EDX(regs) = 0; \
  45         PT_REGS_ESI(regs) = 0; \
  46         PT_REGS_EDI(regs) = 0; \
  47         PT_REGS_EBP(regs) = 0; \
  48         PT_REGS_EAX(regs) = 0; \
  49 } while (0)
  50
  51 #define ELF_EXEC_PAGESIZE 4096
  52
  53 #define ELF_ET_DYN_BASE (2 * TASK_SIZE / 3)
  54
  55 /* Shamelessly stolen from include/asm-i386/elf.h */
  56
  57 #define ELF_CORE_COPY_REGS(pr_reg, regs) do {   \
  58         pr_reg[0] = PT_REGS_EBX(regs);          \
  59         pr_reg[1] = PT_REGS_ECX(regs);          \
  60         pr_reg[2] = PT_REGS_EDX(regs);          \
  61         pr_reg[3] = PT_REGS_ESI(regs);          \
  62         pr_reg[4] = PT_REGS_EDI(regs);          \
  63         pr_reg[5] = PT_REGS_EBP(regs);          \
  64         pr_reg[6] = PT_REGS_EAX(regs);          \
  65         pr_reg[7] = PT_REGS_DS(regs);           \
  66         pr_reg[8] = PT_REGS_ES(regs);           \
  67         /* fake once used fs and gs selectors? */       \
  68         pr_reg[9] = PT_REGS_DS(regs);           \
  69         pr_reg[10] = PT_REGS_DS(regs);          \
  70         pr_reg[11] = PT_REGS_SYSCALL_NR(regs);  \
  71         pr_reg[12] = PT_REGS_IP(regs);          \
  72         pr_reg[13] = PT_REGS_CS(regs);          \
  73         pr_reg[14] = PT_REGS_EFLAGS(regs);      \
  74         pr_reg[15] = PT_REGS_SP(regs);          \
  75         pr_reg[16] = PT_REGS_SS(regs);          \
  76 } while (0);
  77
  78 extern int elf_core_copy_fpregs(struct task_struct *t, elf_fpregset_t *fpu);
  79
  80 #define ELF_CORE_COPY_FPREGS(t, fpu) elf_core_copy_fpregs(t, fpu)
  81
  82 extern long elf_aux_hwcap;
  83 #define ELF_HWCAP (elf_aux_hwcap)
  84
  85 extern char * elf_aux_platform;
  86 #define ELF_PLATFORM (elf_aux_platform)
  87
  88 #define SET_PERSONALITY(ex) do { } while (0)
  89
  90 extern unsigned long vsyscall_ehdr;
  91 extern unsigned long vsyscall_end;
  92 extern unsigned long __kernel_vsyscall;
  93
  94 #define VSYSCALL_BASE vsyscall_ehdr
  95 #define VSYSCALL_END vsyscall_end
  96
  97 /*
  98  * This is the range that is readable by user mode, and things
  99  * acting like user mode such as get_user_pages.
 100  */
 101 #define FIXADDR_USER_START      VSYSCALL_BASE
 102 #define FIXADDR_USER_END        VSYSCALL_END
 103
 104 /*
 105  * Architecture-neutral AT_ values in 0-17, leave some room
 106  * for more of them, start the x86-specific ones at 32.
 107  */
 108 #define AT_SYSINFO              32
 109 #define AT_SYSINFO_EHDR         33
 110
 111 #define ARCH_DLINFO                                             \
 112 do {                                                            \
 113         if ( vsyscall_ehdr ) {                                  \
 114                 NEW_AUX_ENT(AT_SYSINFO, __kernel_vsyscall);     \
 115                 NEW_AUX_ENT(AT_SYSINFO_EHDR, vsyscall_ehdr);    \
 116         }                                                       \
 117 } while (0)
 118
 119 /*
 120  * These macros parameterize elf_core_dump in fs/binfmt_elf.c to write out
 121  * extra segments containing the vsyscall DSO contents.  Dumping its
 122  * contents makes post-mortem fully interpretable later without matching up
 123  * the same kernel and hardware config to see what PC values meant.
 124  * Dumping its extra ELF program headers includes all the other information
 125  * a debugger needs to easily find how the vsyscall DSO was being used.
 126  */
 127 #define ELF_CORE_EXTRA_PHDRS                                                  \
 128         (vsyscall_ehdr ? (((struct elfhdr *)vsyscall_ehdr)->e_phnum) : 0 )
 129
 130 #define ELF_CORE_WRITE_EXTRA_PHDRS                                            \
 131 if ( vsyscall_ehdr ) {                                                        \
 132         const struct elfhdr *const ehdrp = (struct elfhdr *)vsyscall_ehdr;    \
 133         const struct elf_phdr *const phdrp =                                  \
 134                 (const struct elf_phdr *) (vsyscall_ehdr + ehdrp->e_phoff);   \
 135         int i;                                                                \
 136         Elf32_Off ofs = 0;                                                    \
 137         for (i = 0; i < ehdrp->e_phnum; ++i) {                                \
 138                 struct elf_phdr phdr = phdrp[i];                              \
 139                 if (phdr.p_type == PT_LOAD) {                                 \
 140                         ofs = phdr.p_offset = offset;                         \
 141                         offset += phdr.p_filesz;                              \
 142                 }                                                             \
 143                 else                                                          \
 144                         phdr.p_offset += ofs;                                 \
 145                 phdr.p_paddr = 0; /* match other core phdrs */                \
 146                 DUMP_WRITE(&phdr, sizeof(phdr));                              \
 147         }                                                                     \
 148 }
 149 #define ELF_CORE_WRITE_EXTRA_DATA                                             \
 150 if ( vsyscall_ehdr ) {                                                        \
 151         const struct elfhdr *const ehdrp = (struct elfhdr *)vsyscall_ehdr;    \
 152         const struct elf_phdr *const phdrp =                                  \
 153                 (const struct elf_phdr *) (vsyscall_ehdr + ehdrp->e_phoff);   \
 154         int i;                                                                \
 155         for (i = 0; i < ehdrp->e_phnum; ++i) {                                \
 156                 if (phdrp[i].p_type == PT_LOAD)                               \
 157                         DUMP_WRITE((void *) phdrp[i].p_vaddr,                 \
 158                                    phdrp[i].p_filesz);                        \
 159         }                                                                     \
 160 }
 161
 162 #endif