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1 /* This is the Linux kernel elf-loading code, ported into user space */ |
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2 |
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3 #include <stdio.h> |
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4 #include <sys/types.h> |
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5 #include <fcntl.h> |
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6 #include <errno.h> |
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7 #include <unistd.h> |
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8 #include <sys/mman.h> |
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9 #include <stdlib.h> |
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10 #include <string.h> |
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11 |
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12 #include "qemu.h" |
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13 #include "disas.h" |
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14 |
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15 #ifdef __powerpc64__ |
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16 #undef ARCH_DLINFO |
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17 #undef ELF_PLATFORM |
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18 #undef ELF_HWCAP |
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19 #undef ELF_CLASS |
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20 #undef ELF_DATA |
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21 #undef ELF_ARCH |
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22 #endif |
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23 |
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24 /* from personality.h */ |
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25 |
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26 /* |
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27 * Flags for bug emulation. |
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28 * |
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29 * These occupy the top three bytes. |
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30 */ |
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31 enum { |
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32 ADDR_NO_RANDOMIZE = 0x0040000, /* disable randomization of VA space */ |
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33 FDPIC_FUNCPTRS = 0x0080000, /* userspace function ptrs point to descriptors |
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34 * (signal handling) |
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35 */ |
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36 MMAP_PAGE_ZERO = 0x0100000, |
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37 ADDR_COMPAT_LAYOUT = 0x0200000, |
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38 READ_IMPLIES_EXEC = 0x0400000, |
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39 ADDR_LIMIT_32BIT = 0x0800000, |
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40 SHORT_INODE = 0x1000000, |
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41 WHOLE_SECONDS = 0x2000000, |
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42 STICKY_TIMEOUTS = 0x4000000, |
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43 ADDR_LIMIT_3GB = 0x8000000, |
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44 }; |
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45 |
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46 /* |
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47 * Personality types. |
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48 * |
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49 * These go in the low byte. Avoid using the top bit, it will |
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50 * conflict with error returns. |
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51 */ |
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52 enum { |
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53 PER_LINUX = 0x0000, |
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54 PER_LINUX_32BIT = 0x0000 | ADDR_LIMIT_32BIT, |
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55 PER_LINUX_FDPIC = 0x0000 | FDPIC_FUNCPTRS, |
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56 PER_SVR4 = 0x0001 | STICKY_TIMEOUTS | MMAP_PAGE_ZERO, |
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57 PER_SVR3 = 0x0002 | STICKY_TIMEOUTS | SHORT_INODE, |
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58 PER_SCOSVR3 = 0x0003 | STICKY_TIMEOUTS | |
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59 WHOLE_SECONDS | SHORT_INODE, |
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60 PER_OSR5 = 0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS, |
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61 PER_WYSEV386 = 0x0004 | STICKY_TIMEOUTS | SHORT_INODE, |
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62 PER_ISCR4 = 0x0005 | STICKY_TIMEOUTS, |
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63 PER_BSD = 0x0006, |
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64 PER_SUNOS = 0x0006 | STICKY_TIMEOUTS, |
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65 PER_XENIX = 0x0007 | STICKY_TIMEOUTS | SHORT_INODE, |
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66 PER_LINUX32 = 0x0008, |
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67 PER_LINUX32_3GB = 0x0008 | ADDR_LIMIT_3GB, |
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68 PER_IRIX32 = 0x0009 | STICKY_TIMEOUTS,/* IRIX5 32-bit */ |
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69 PER_IRIXN32 = 0x000a | STICKY_TIMEOUTS,/* IRIX6 new 32-bit */ |
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70 PER_IRIX64 = 0x000b | STICKY_TIMEOUTS,/* IRIX6 64-bit */ |
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71 PER_RISCOS = 0x000c, |
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72 PER_SOLARIS = 0x000d | STICKY_TIMEOUTS, |
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73 PER_UW7 = 0x000e | STICKY_TIMEOUTS | MMAP_PAGE_ZERO, |
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74 PER_OSF4 = 0x000f, /* OSF/1 v4 */ |
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75 PER_HPUX = 0x0010, |
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76 PER_MASK = 0x00ff, |
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77 }; |
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78 |
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79 /* |
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80 * Return the base personality without flags. |
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81 */ |
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82 #define personality(pers) (pers & PER_MASK) |
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83 |
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84 /* this flag is uneffective under linux too, should be deleted */ |
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85 #ifndef MAP_DENYWRITE |
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86 #define MAP_DENYWRITE 0 |
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87 #endif |
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88 |
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89 /* should probably go in elf.h */ |
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90 #ifndef ELIBBAD |
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91 #define ELIBBAD 80 |
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92 #endif |
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93 |
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94 #ifdef TARGET_I386 |
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95 |
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96 #define ELF_PLATFORM get_elf_platform() |
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97 |
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98 static const char *get_elf_platform(void) |
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99 { |
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100 static char elf_platform[] = "i386"; |
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101 int family = (thread_env->cpuid_version >> 8) & 0xff; |
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102 if (family > 6) |
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103 family = 6; |
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104 if (family >= 3) |
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105 elf_platform[1] = '0' + family; |
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106 return elf_platform; |
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107 } |
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108 |
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109 #define ELF_HWCAP get_elf_hwcap() |
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110 |
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111 static uint32_t get_elf_hwcap(void) |
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112 { |
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113 return thread_env->cpuid_features; |
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114 } |
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115 |
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116 #ifdef TARGET_X86_64 |
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117 #define ELF_START_MMAP 0x2aaaaab000ULL |
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118 #define elf_check_arch(x) ( ((x) == ELF_ARCH) ) |
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119 |
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120 #define ELF_CLASS ELFCLASS64 |
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121 #define ELF_DATA ELFDATA2LSB |
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122 #define ELF_ARCH EM_X86_64 |
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123 |
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124 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) |
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125 { |
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126 regs->rax = 0; |
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127 regs->rsp = infop->start_stack; |
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128 regs->rip = infop->entry; |
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129 } |
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130 |
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131 #else |
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132 |
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133 #define ELF_START_MMAP 0x80000000 |
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134 |
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135 /* |
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136 * This is used to ensure we don't load something for the wrong architecture. |
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137 */ |
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138 #define elf_check_arch(x) ( ((x) == EM_386) || ((x) == EM_486) ) |
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139 |
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140 /* |
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141 * These are used to set parameters in the core dumps. |
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142 */ |
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143 #define ELF_CLASS ELFCLASS32 |
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144 #define ELF_DATA ELFDATA2LSB |
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145 #define ELF_ARCH EM_386 |
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146 |
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147 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) |
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148 { |
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149 regs->esp = infop->start_stack; |
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150 regs->eip = infop->entry; |
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151 |
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152 /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program |
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153 starts %edx contains a pointer to a function which might be |
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154 registered using `atexit'. This provides a mean for the |
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155 dynamic linker to call DT_FINI functions for shared libraries |
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156 that have been loaded before the code runs. |
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157 |
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158 A value of 0 tells we have no such handler. */ |
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159 regs->edx = 0; |
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160 } |
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161 #endif |
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162 |
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163 #define USE_ELF_CORE_DUMP |
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164 #define ELF_EXEC_PAGESIZE 4096 |
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165 |
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166 #endif |
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167 |
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168 #ifdef TARGET_ARM |
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169 |
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170 #define ELF_START_MMAP 0x80000000 |
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171 |
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172 #define elf_check_arch(x) ( (x) == EM_ARM ) |
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173 |
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174 #define ELF_CLASS ELFCLASS32 |
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175 #ifdef TARGET_WORDS_BIGENDIAN |
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176 #define ELF_DATA ELFDATA2MSB |
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177 #else |
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178 #define ELF_DATA ELFDATA2LSB |
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179 #endif |
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180 #define ELF_ARCH EM_ARM |
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181 |
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182 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) |
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183 { |
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184 abi_long stack = infop->start_stack; |
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185 memset(regs, 0, sizeof(*regs)); |
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186 regs->ARM_cpsr = 0x10; |
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187 if (infop->entry & 1) |
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188 regs->ARM_cpsr |= CPSR_T; |
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189 regs->ARM_pc = infop->entry & 0xfffffffe; |
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190 regs->ARM_sp = infop->start_stack; |
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191 /* FIXME - what to for failure of get_user()? */ |
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192 get_user_ual(regs->ARM_r2, stack + 8); /* envp */ |
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193 get_user_ual(regs->ARM_r1, stack + 4); /* envp */ |
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194 /* XXX: it seems that r0 is zeroed after ! */ |
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195 regs->ARM_r0 = 0; |
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196 /* For uClinux PIC binaries. */ |
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197 /* XXX: Linux does this only on ARM with no MMU (do we care ?) */ |
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198 regs->ARM_r10 = infop->start_data; |
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199 } |
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200 |
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201 #define USE_ELF_CORE_DUMP |
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202 #define ELF_EXEC_PAGESIZE 4096 |
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203 |
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204 enum |
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205 { |
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206 ARM_HWCAP_ARM_SWP = 1 << 0, |
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207 ARM_HWCAP_ARM_HALF = 1 << 1, |
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208 ARM_HWCAP_ARM_THUMB = 1 << 2, |
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209 ARM_HWCAP_ARM_26BIT = 1 << 3, |
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210 ARM_HWCAP_ARM_FAST_MULT = 1 << 4, |
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211 ARM_HWCAP_ARM_FPA = 1 << 5, |
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212 ARM_HWCAP_ARM_VFP = 1 << 6, |
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213 ARM_HWCAP_ARM_EDSP = 1 << 7, |
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214 }; |
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215 |
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216 #define ELF_HWCAP (ARM_HWCAP_ARM_SWP | ARM_HWCAP_ARM_HALF \ |
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217 | ARM_HWCAP_ARM_THUMB | ARM_HWCAP_ARM_FAST_MULT \ |
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218 | ARM_HWCAP_ARM_FPA | ARM_HWCAP_ARM_VFP) |
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219 |
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220 #endif |
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221 |
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222 #ifdef TARGET_SPARC |
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223 #ifdef TARGET_SPARC64 |
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224 |
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225 #define ELF_START_MMAP 0x80000000 |
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226 |
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227 #ifndef TARGET_ABI32 |
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228 #define elf_check_arch(x) ( (x) == EM_SPARCV9 || (x) == EM_SPARC32PLUS ) |
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229 #else |
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230 #define elf_check_arch(x) ( (x) == EM_SPARC32PLUS || (x) == EM_SPARC ) |
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231 #endif |
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232 |
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233 #define ELF_CLASS ELFCLASS64 |
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234 #define ELF_DATA ELFDATA2MSB |
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235 #define ELF_ARCH EM_SPARCV9 |
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236 |
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237 #define STACK_BIAS 2047 |
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238 |
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239 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) |
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240 { |
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241 #ifndef TARGET_ABI32 |
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242 regs->tstate = 0; |
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243 #endif |
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244 regs->pc = infop->entry; |
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245 regs->npc = regs->pc + 4; |
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246 regs->y = 0; |
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247 #ifdef TARGET_ABI32 |
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248 regs->u_regs[14] = infop->start_stack - 16 * 4; |
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249 #else |
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250 if (personality(infop->personality) == PER_LINUX32) |
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251 regs->u_regs[14] = infop->start_stack - 16 * 4; |
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252 else |
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253 regs->u_regs[14] = infop->start_stack - 16 * 8 - STACK_BIAS; |
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254 #endif |
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255 } |
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256 |
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257 #else |
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258 #define ELF_START_MMAP 0x80000000 |
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259 |
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260 #define elf_check_arch(x) ( (x) == EM_SPARC ) |
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261 |
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262 #define ELF_CLASS ELFCLASS32 |
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263 #define ELF_DATA ELFDATA2MSB |
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264 #define ELF_ARCH EM_SPARC |
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265 |
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266 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) |
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267 { |
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268 regs->psr = 0; |
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269 regs->pc = infop->entry; |
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270 regs->npc = regs->pc + 4; |
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271 regs->y = 0; |
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272 regs->u_regs[14] = infop->start_stack - 16 * 4; |
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273 } |
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274 |
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275 #endif |
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276 #endif |
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277 |
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278 #ifdef TARGET_PPC |
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279 |
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280 #define ELF_START_MMAP 0x80000000 |
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281 |
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282 #if defined(TARGET_PPC64) && !defined(TARGET_ABI32) |
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283 |
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284 #define elf_check_arch(x) ( (x) == EM_PPC64 ) |
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285 |
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286 #define ELF_CLASS ELFCLASS64 |
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287 |
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288 #else |
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289 |
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290 #define elf_check_arch(x) ( (x) == EM_PPC ) |
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291 |
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292 #define ELF_CLASS ELFCLASS32 |
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293 |
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294 #endif |
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295 |
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296 #ifdef TARGET_WORDS_BIGENDIAN |
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297 #define ELF_DATA ELFDATA2MSB |
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298 #else |
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299 #define ELF_DATA ELFDATA2LSB |
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300 #endif |
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301 #define ELF_ARCH EM_PPC |
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302 |
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303 /* |
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304 * We need to put in some extra aux table entries to tell glibc what |
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305 * the cache block size is, so it can use the dcbz instruction safely. |
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306 */ |
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307 #define AT_DCACHEBSIZE 19 |
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308 #define AT_ICACHEBSIZE 20 |
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309 #define AT_UCACHEBSIZE 21 |
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310 /* A special ignored type value for PPC, for glibc compatibility. */ |
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311 #define AT_IGNOREPPC 22 |
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312 /* |
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313 * The requirements here are: |
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314 * - keep the final alignment of sp (sp & 0xf) |
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315 * - make sure the 32-bit value at the first 16 byte aligned position of |
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316 * AUXV is greater than 16 for glibc compatibility. |
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317 * AT_IGNOREPPC is used for that. |
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318 * - for compatibility with glibc ARCH_DLINFO must always be defined on PPC, |
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319 * even if DLINFO_ARCH_ITEMS goes to zero or is undefined. |
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320 */ |
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321 #define DLINFO_ARCH_ITEMS 5 |
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322 #define ARCH_DLINFO \ |
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323 do { \ |
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324 NEW_AUX_ENT(AT_DCACHEBSIZE, 0x20); \ |
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325 NEW_AUX_ENT(AT_ICACHEBSIZE, 0x20); \ |
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326 NEW_AUX_ENT(AT_UCACHEBSIZE, 0); \ |
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327 /* \ |
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328 * Now handle glibc compatibility. \ |
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329 */ \ |
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330 NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \ |
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331 NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \ |
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332 } while (0) |
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333 |
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334 static inline void init_thread(struct target_pt_regs *_regs, struct image_info *infop) |
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335 { |
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336 abi_ulong pos = infop->start_stack; |
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337 abi_ulong tmp; |
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338 #if defined(TARGET_PPC64) && !defined(TARGET_ABI32) |
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339 abi_ulong entry, toc; |
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340 #endif |
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341 |
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342 _regs->gpr[1] = infop->start_stack; |
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343 #if defined(TARGET_PPC64) && !defined(TARGET_ABI32) |
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344 entry = ldq_raw(infop->entry) + infop->load_addr; |
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345 toc = ldq_raw(infop->entry + 8) + infop->load_addr; |
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346 _regs->gpr[2] = toc; |
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347 infop->entry = entry; |
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348 #endif |
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349 _regs->nip = infop->entry; |
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350 /* Note that isn't exactly what regular kernel does |
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351 * but this is what the ABI wants and is needed to allow |
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352 * execution of PPC BSD programs. |
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353 */ |
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354 /* FIXME - what to for failure of get_user()? */ |
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355 get_user_ual(_regs->gpr[3], pos); |
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356 pos += sizeof(abi_ulong); |
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357 _regs->gpr[4] = pos; |
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358 for (tmp = 1; tmp != 0; pos += sizeof(abi_ulong)) |
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359 tmp = ldl(pos); |
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360 _regs->gpr[5] = pos; |
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361 } |
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362 |
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363 #define USE_ELF_CORE_DUMP |
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364 #define ELF_EXEC_PAGESIZE 4096 |
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365 |
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366 #endif |
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367 |
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368 #ifdef TARGET_MIPS |
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369 |
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370 #define ELF_START_MMAP 0x80000000 |
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371 |
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372 #define elf_check_arch(x) ( (x) == EM_MIPS ) |
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373 |
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374 #ifdef TARGET_MIPS64 |
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375 #define ELF_CLASS ELFCLASS64 |
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376 #else |
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377 #define ELF_CLASS ELFCLASS32 |
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378 #endif |
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379 #ifdef TARGET_WORDS_BIGENDIAN |
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380 #define ELF_DATA ELFDATA2MSB |
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381 #else |
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382 #define ELF_DATA ELFDATA2LSB |
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383 #endif |
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384 #define ELF_ARCH EM_MIPS |
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385 |
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386 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) |
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387 { |
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388 regs->cp0_status = 2 << CP0St_KSU; |
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389 regs->cp0_epc = infop->entry; |
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390 regs->regs[29] = infop->start_stack; |
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391 } |
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392 |
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393 #define USE_ELF_CORE_DUMP |
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394 #define ELF_EXEC_PAGESIZE 4096 |
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395 |
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396 #endif /* TARGET_MIPS */ |
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397 |
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398 #ifdef TARGET_SH4 |
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399 |
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400 #define ELF_START_MMAP 0x80000000 |
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401 |
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402 #define elf_check_arch(x) ( (x) == EM_SH ) |
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403 |
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404 #define ELF_CLASS ELFCLASS32 |
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405 #define ELF_DATA ELFDATA2LSB |
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406 #define ELF_ARCH EM_SH |
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407 |
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408 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) |
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409 { |
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410 /* Check other registers XXXXX */ |
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411 regs->pc = infop->entry; |
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412 regs->regs[15] = infop->start_stack; |
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413 } |
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414 |
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415 #define USE_ELF_CORE_DUMP |
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416 #define ELF_EXEC_PAGESIZE 4096 |
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417 |
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418 #endif |
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419 |
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420 #ifdef TARGET_CRIS |
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421 |
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422 #define ELF_START_MMAP 0x80000000 |
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423 |
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424 #define elf_check_arch(x) ( (x) == EM_CRIS ) |
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425 |
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426 #define ELF_CLASS ELFCLASS32 |
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427 #define ELF_DATA ELFDATA2LSB |
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428 #define ELF_ARCH EM_CRIS |
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429 |
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430 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) |
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431 { |
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432 regs->erp = infop->entry; |
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433 } |
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434 |
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435 #define USE_ELF_CORE_DUMP |
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436 #define ELF_EXEC_PAGESIZE 8192 |
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437 |
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438 #endif |
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439 |
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440 #ifdef TARGET_M68K |
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441 |
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442 #define ELF_START_MMAP 0x80000000 |
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443 |
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444 #define elf_check_arch(x) ( (x) == EM_68K ) |
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445 |
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446 #define ELF_CLASS ELFCLASS32 |
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447 #define ELF_DATA ELFDATA2MSB |
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448 #define ELF_ARCH EM_68K |
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449 |
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450 /* ??? Does this need to do anything? |
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451 #define ELF_PLAT_INIT(_r) */ |
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452 |
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453 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) |
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454 { |
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455 regs->usp = infop->start_stack; |
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456 regs->sr = 0; |
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457 regs->pc = infop->entry; |
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458 } |
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459 |
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460 #define USE_ELF_CORE_DUMP |
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461 #define ELF_EXEC_PAGESIZE 8192 |
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462 |
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463 #endif |
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464 |
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465 #ifdef TARGET_ALPHA |
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466 |
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467 #define ELF_START_MMAP (0x30000000000ULL) |
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468 |
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469 #define elf_check_arch(x) ( (x) == ELF_ARCH ) |
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470 |
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471 #define ELF_CLASS ELFCLASS64 |
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472 #define ELF_DATA ELFDATA2MSB |
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473 #define ELF_ARCH EM_ALPHA |
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474 |
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475 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) |
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476 { |
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477 regs->pc = infop->entry; |
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478 regs->ps = 8; |
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479 regs->usp = infop->start_stack; |
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480 regs->unique = infop->start_data; /* ? */ |
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481 printf("Set unique value to " TARGET_FMT_lx " (" TARGET_FMT_lx ")\n", |
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482 regs->unique, infop->start_data); |
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483 } |
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484 |
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485 #define USE_ELF_CORE_DUMP |
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486 #define ELF_EXEC_PAGESIZE 8192 |
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487 |
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488 #endif /* TARGET_ALPHA */ |
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489 |
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490 #ifndef ELF_PLATFORM |
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491 #define ELF_PLATFORM (NULL) |
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492 #endif |
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493 |
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494 #ifndef ELF_HWCAP |
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495 #define ELF_HWCAP 0 |
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496 #endif |
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497 |
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498 #ifdef TARGET_ABI32 |
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499 #undef ELF_CLASS |
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500 #define ELF_CLASS ELFCLASS32 |
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501 #undef bswaptls |
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502 #define bswaptls(ptr) bswap32s(ptr) |
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503 #endif |
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504 |
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505 #include "elf.h" |
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506 |
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507 struct exec |
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508 { |
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509 unsigned int a_info; /* Use macros N_MAGIC, etc for access */ |
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510 unsigned int a_text; /* length of text, in bytes */ |
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511 unsigned int a_data; /* length of data, in bytes */ |
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512 unsigned int a_bss; /* length of uninitialized data area, in bytes */ |
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513 unsigned int a_syms; /* length of symbol table data in file, in bytes */ |
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514 unsigned int a_entry; /* start address */ |
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515 unsigned int a_trsize; /* length of relocation info for text, in bytes */ |
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516 unsigned int a_drsize; /* length of relocation info for data, in bytes */ |
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517 }; |
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518 |
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519 |
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520 #define N_MAGIC(exec) ((exec).a_info & 0xffff) |
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521 #define OMAGIC 0407 |
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522 #define NMAGIC 0410 |
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523 #define ZMAGIC 0413 |
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524 #define QMAGIC 0314 |
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525 |
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526 /* max code+data+bss space allocated to elf interpreter */ |
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527 #define INTERP_MAP_SIZE (32 * 1024 * 1024) |
|
528 |
|
529 /* max code+data+bss+brk space allocated to ET_DYN executables */ |
|
530 #define ET_DYN_MAP_SIZE (128 * 1024 * 1024) |
|
531 |
|
532 /* Necessary parameters */ |
|
533 #define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE |
|
534 #define TARGET_ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE-1)) |
|
535 #define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE-1)) |
|
536 |
|
537 #define INTERPRETER_NONE 0 |
|
538 #define INTERPRETER_AOUT 1 |
|
539 #define INTERPRETER_ELF 2 |
|
540 |
|
541 #define DLINFO_ITEMS 12 |
|
542 |
|
543 static inline void memcpy_fromfs(void * to, const void * from, unsigned long n) |
|
544 { |
|
545 memcpy(to, from, n); |
|
546 } |
|
547 |
|
548 static int load_aout_interp(void * exptr, int interp_fd); |
|
549 |
|
550 #ifdef BSWAP_NEEDED |
|
551 static void bswap_ehdr(struct elfhdr *ehdr) |
|
552 { |
|
553 bswap16s(&ehdr->e_type); /* Object file type */ |
|
554 bswap16s(&ehdr->e_machine); /* Architecture */ |
|
555 bswap32s(&ehdr->e_version); /* Object file version */ |
|
556 bswaptls(&ehdr->e_entry); /* Entry point virtual address */ |
|
557 bswaptls(&ehdr->e_phoff); /* Program header table file offset */ |
|
558 bswaptls(&ehdr->e_shoff); /* Section header table file offset */ |
|
559 bswap32s(&ehdr->e_flags); /* Processor-specific flags */ |
|
560 bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */ |
|
561 bswap16s(&ehdr->e_phentsize); /* Program header table entry size */ |
|
562 bswap16s(&ehdr->e_phnum); /* Program header table entry count */ |
|
563 bswap16s(&ehdr->e_shentsize); /* Section header table entry size */ |
|
564 bswap16s(&ehdr->e_shnum); /* Section header table entry count */ |
|
565 bswap16s(&ehdr->e_shstrndx); /* Section header string table index */ |
|
566 } |
|
567 |
|
568 static void bswap_phdr(struct elf_phdr *phdr) |
|
569 { |
|
570 bswap32s(&phdr->p_type); /* Segment type */ |
|
571 bswaptls(&phdr->p_offset); /* Segment file offset */ |
|
572 bswaptls(&phdr->p_vaddr); /* Segment virtual address */ |
|
573 bswaptls(&phdr->p_paddr); /* Segment physical address */ |
|
574 bswaptls(&phdr->p_filesz); /* Segment size in file */ |
|
575 bswaptls(&phdr->p_memsz); /* Segment size in memory */ |
|
576 bswap32s(&phdr->p_flags); /* Segment flags */ |
|
577 bswaptls(&phdr->p_align); /* Segment alignment */ |
|
578 } |
|
579 |
|
580 static void bswap_shdr(struct elf_shdr *shdr) |
|
581 { |
|
582 bswap32s(&shdr->sh_name); |
|
583 bswap32s(&shdr->sh_type); |
|
584 bswaptls(&shdr->sh_flags); |
|
585 bswaptls(&shdr->sh_addr); |
|
586 bswaptls(&shdr->sh_offset); |
|
587 bswaptls(&shdr->sh_size); |
|
588 bswap32s(&shdr->sh_link); |
|
589 bswap32s(&shdr->sh_info); |
|
590 bswaptls(&shdr->sh_addralign); |
|
591 bswaptls(&shdr->sh_entsize); |
|
592 } |
|
593 |
|
594 static void bswap_sym(struct elf_sym *sym) |
|
595 { |
|
596 bswap32s(&sym->st_name); |
|
597 bswaptls(&sym->st_value); |
|
598 bswaptls(&sym->st_size); |
|
599 bswap16s(&sym->st_shndx); |
|
600 } |
|
601 #endif |
|
602 |
|
603 /* |
|
604 * 'copy_elf_strings()' copies argument/envelope strings from user |
|
605 * memory to free pages in kernel mem. These are in a format ready |
|
606 * to be put directly into the top of new user memory. |
|
607 * |
|
608 */ |
|
609 static abi_ulong copy_elf_strings(int argc,char ** argv, void **page, |
|
610 abi_ulong p) |
|
611 { |
|
612 char *tmp, *tmp1, *pag = NULL; |
|
613 int len, offset = 0; |
|
614 |
|
615 if (!p) { |
|
616 return 0; /* bullet-proofing */ |
|
617 } |
|
618 while (argc-- > 0) { |
|
619 tmp = argv[argc]; |
|
620 if (!tmp) { |
|
621 fprintf(stderr, "VFS: argc is wrong"); |
|
622 exit(-1); |
|
623 } |
|
624 tmp1 = tmp; |
|
625 while (*tmp++); |
|
626 len = tmp - tmp1; |
|
627 if (p < len) { /* this shouldn't happen - 128kB */ |
|
628 return 0; |
|
629 } |
|
630 while (len) { |
|
631 --p; --tmp; --len; |
|
632 if (--offset < 0) { |
|
633 offset = p % TARGET_PAGE_SIZE; |
|
634 pag = (char *)page[p/TARGET_PAGE_SIZE]; |
|
635 if (!pag) { |
|
636 pag = (char *)malloc(TARGET_PAGE_SIZE); |
|
637 memset(pag, 0, TARGET_PAGE_SIZE); |
|
638 page[p/TARGET_PAGE_SIZE] = pag; |
|
639 if (!pag) |
|
640 return 0; |
|
641 } |
|
642 } |
|
643 if (len == 0 || offset == 0) { |
|
644 *(pag + offset) = *tmp; |
|
645 } |
|
646 else { |
|
647 int bytes_to_copy = (len > offset) ? offset : len; |
|
648 tmp -= bytes_to_copy; |
|
649 p -= bytes_to_copy; |
|
650 offset -= bytes_to_copy; |
|
651 len -= bytes_to_copy; |
|
652 memcpy_fromfs(pag + offset, tmp, bytes_to_copy + 1); |
|
653 } |
|
654 } |
|
655 } |
|
656 return p; |
|
657 } |
|
658 |
|
659 static abi_ulong setup_arg_pages(abi_ulong p, struct linux_binprm *bprm, |
|
660 struct image_info *info) |
|
661 { |
|
662 abi_ulong stack_base, size, error; |
|
663 int i; |
|
664 |
|
665 /* Create enough stack to hold everything. If we don't use |
|
666 * it for args, we'll use it for something else... |
|
667 */ |
|
668 size = x86_stack_size; |
|
669 if (size < MAX_ARG_PAGES*TARGET_PAGE_SIZE) |
|
670 size = MAX_ARG_PAGES*TARGET_PAGE_SIZE; |
|
671 error = target_mmap(0, |
|
672 size + qemu_host_page_size, |
|
673 PROT_READ | PROT_WRITE, |
|
674 MAP_PRIVATE | MAP_ANONYMOUS, |
|
675 -1, 0); |
|
676 if (error == -1) { |
|
677 perror("stk mmap"); |
|
678 exit(-1); |
|
679 } |
|
680 /* we reserve one extra page at the top of the stack as guard */ |
|
681 target_mprotect(error + size, qemu_host_page_size, PROT_NONE); |
|
682 |
|
683 stack_base = error + size - MAX_ARG_PAGES*TARGET_PAGE_SIZE; |
|
684 p += stack_base; |
|
685 |
|
686 for (i = 0 ; i < MAX_ARG_PAGES ; i++) { |
|
687 if (bprm->page[i]) { |
|
688 info->rss++; |
|
689 /* FIXME - check return value of memcpy_to_target() for failure */ |
|
690 memcpy_to_target(stack_base, bprm->page[i], TARGET_PAGE_SIZE); |
|
691 free(bprm->page[i]); |
|
692 } |
|
693 stack_base += TARGET_PAGE_SIZE; |
|
694 } |
|
695 info->stack_base = stack_base; |
|
696 return p; |
|
697 } |
|
698 |
|
699 static void set_brk(abi_ulong start, abi_ulong end) |
|
700 { |
|
701 /* page-align the start and end addresses... */ |
|
702 start = HOST_PAGE_ALIGN(start); |
|
703 end = HOST_PAGE_ALIGN(end); |
|
704 if (end <= start) |
|
705 return; |
|
706 if(target_mmap(start, end - start, |
|
707 PROT_READ | PROT_WRITE | PROT_EXEC, |
|
708 MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0) == -1) { |
|
709 perror("cannot mmap brk"); |
|
710 exit(-1); |
|
711 } |
|
712 } |
|
713 |
|
714 |
|
715 /* We need to explicitly zero any fractional pages after the data |
|
716 section (i.e. bss). This would contain the junk from the file that |
|
717 should not be in memory. */ |
|
718 static void padzero(abi_ulong elf_bss, abi_ulong last_bss) |
|
719 { |
|
720 abi_ulong nbyte; |
|
721 |
|
722 if (elf_bss >= last_bss) |
|
723 return; |
|
724 |
|
725 /* XXX: this is really a hack : if the real host page size is |
|
726 smaller than the target page size, some pages after the end |
|
727 of the file may not be mapped. A better fix would be to |
|
728 patch target_mmap(), but it is more complicated as the file |
|
729 size must be known */ |
|
730 if (qemu_real_host_page_size < qemu_host_page_size) { |
|
731 abi_ulong end_addr, end_addr1; |
|
732 end_addr1 = (elf_bss + qemu_real_host_page_size - 1) & |
|
733 ~(qemu_real_host_page_size - 1); |
|
734 end_addr = HOST_PAGE_ALIGN(elf_bss); |
|
735 if (end_addr1 < end_addr) { |
|
736 mmap((void *)g2h(end_addr1), end_addr - end_addr1, |
|
737 PROT_READ|PROT_WRITE|PROT_EXEC, |
|
738 MAP_FIXED|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); |
|
739 } |
|
740 } |
|
741 |
|
742 nbyte = elf_bss & (qemu_host_page_size-1); |
|
743 if (nbyte) { |
|
744 nbyte = qemu_host_page_size - nbyte; |
|
745 do { |
|
746 /* FIXME - what to do if put_user() fails? */ |
|
747 put_user_u8(0, elf_bss); |
|
748 elf_bss++; |
|
749 } while (--nbyte); |
|
750 } |
|
751 } |
|
752 |
|
753 |
|
754 static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc, |
|
755 struct elfhdr * exec, |
|
756 abi_ulong load_addr, |
|
757 abi_ulong load_bias, |
|
758 abi_ulong interp_load_addr, int ibcs, |
|
759 struct image_info *info) |
|
760 { |
|
761 abi_ulong sp; |
|
762 int size; |
|
763 abi_ulong u_platform; |
|
764 const char *k_platform; |
|
765 const int n = sizeof(elf_addr_t); |
|
766 |
|
767 sp = p; |
|
768 u_platform = 0; |
|
769 k_platform = ELF_PLATFORM; |
|
770 if (k_platform) { |
|
771 size_t len = strlen(k_platform) + 1; |
|
772 sp -= (len + n - 1) & ~(n - 1); |
|
773 u_platform = sp; |
|
774 /* FIXME - check return value of memcpy_to_target() for failure */ |
|
775 memcpy_to_target(sp, k_platform, len); |
|
776 } |
|
777 /* |
|
778 * Force 16 byte _final_ alignment here for generality. |
|
779 */ |
|
780 sp = sp &~ (abi_ulong)15; |
|
781 size = (DLINFO_ITEMS + 1) * 2; |
|
782 if (k_platform) |
|
783 size += 2; |
|
784 #ifdef DLINFO_ARCH_ITEMS |
|
785 size += DLINFO_ARCH_ITEMS * 2; |
|
786 #endif |
|
787 size += envc + argc + 2; |
|
788 size += (!ibcs ? 3 : 1); /* argc itself */ |
|
789 size *= n; |
|
790 if (size & 15) |
|
791 sp -= 16 - (size & 15); |
|
792 |
|
793 /* This is correct because Linux defines |
|
794 * elf_addr_t as Elf32_Off / Elf64_Off |
|
795 */ |
|
796 #define NEW_AUX_ENT(id, val) do { \ |
|
797 sp -= n; put_user_ual(val, sp); \ |
|
798 sp -= n; put_user_ual(id, sp); \ |
|
799 } while(0) |
|
800 |
|
801 NEW_AUX_ENT (AT_NULL, 0); |
|
802 |
|
803 /* There must be exactly DLINFO_ITEMS entries here. */ |
|
804 NEW_AUX_ENT(AT_PHDR, (abi_ulong)(load_addr + exec->e_phoff)); |
|
805 NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof (struct elf_phdr))); |
|
806 NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum)); |
|
807 NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(TARGET_PAGE_SIZE)); |
|
808 NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_load_addr)); |
|
809 NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0); |
|
810 NEW_AUX_ENT(AT_ENTRY, load_bias + exec->e_entry); |
|
811 NEW_AUX_ENT(AT_UID, (abi_ulong) getuid()); |
|
812 NEW_AUX_ENT(AT_EUID, (abi_ulong) geteuid()); |
|
813 NEW_AUX_ENT(AT_GID, (abi_ulong) getgid()); |
|
814 NEW_AUX_ENT(AT_EGID, (abi_ulong) getegid()); |
|
815 NEW_AUX_ENT(AT_HWCAP, (abi_ulong) ELF_HWCAP); |
|
816 NEW_AUX_ENT(AT_CLKTCK, (abi_ulong) sysconf(_SC_CLK_TCK)); |
|
817 if (k_platform) |
|
818 NEW_AUX_ENT(AT_PLATFORM, u_platform); |
|
819 #ifdef ARCH_DLINFO |
|
820 /* |
|
821 * ARCH_DLINFO must come last so platform specific code can enforce |
|
822 * special alignment requirements on the AUXV if necessary (eg. PPC). |
|
823 */ |
|
824 ARCH_DLINFO; |
|
825 #endif |
|
826 #undef NEW_AUX_ENT |
|
827 |
|
828 sp = loader_build_argptr(envc, argc, sp, p, !ibcs); |
|
829 return sp; |
|
830 } |
|
831 |
|
832 |
|
833 static abi_ulong load_elf_interp(struct elfhdr * interp_elf_ex, |
|
834 int interpreter_fd, |
|
835 abi_ulong *interp_load_addr) |
|
836 { |
|
837 struct elf_phdr *elf_phdata = NULL; |
|
838 struct elf_phdr *eppnt; |
|
839 abi_ulong load_addr = 0; |
|
840 int load_addr_set = 0; |
|
841 int retval; |
|
842 abi_ulong last_bss, elf_bss; |
|
843 abi_ulong error; |
|
844 int i; |
|
845 |
|
846 elf_bss = 0; |
|
847 last_bss = 0; |
|
848 error = 0; |
|
849 |
|
850 #ifdef BSWAP_NEEDED |
|
851 bswap_ehdr(interp_elf_ex); |
|
852 #endif |
|
853 /* First of all, some simple consistency checks */ |
|
854 if ((interp_elf_ex->e_type != ET_EXEC && |
|
855 interp_elf_ex->e_type != ET_DYN) || |
|
856 !elf_check_arch(interp_elf_ex->e_machine)) { |
|
857 return ~((abi_ulong)0UL); |
|
858 } |
|
859 |
|
860 |
|
861 /* Now read in all of the header information */ |
|
862 |
|
863 if (sizeof(struct elf_phdr) * interp_elf_ex->e_phnum > TARGET_PAGE_SIZE) |
|
864 return ~(abi_ulong)0UL; |
|
865 |
|
866 elf_phdata = (struct elf_phdr *) |
|
867 malloc(sizeof(struct elf_phdr) * interp_elf_ex->e_phnum); |
|
868 |
|
869 if (!elf_phdata) |
|
870 return ~((abi_ulong)0UL); |
|
871 |
|
872 /* |
|
873 * If the size of this structure has changed, then punt, since |
|
874 * we will be doing the wrong thing. |
|
875 */ |
|
876 if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr)) { |
|
877 free(elf_phdata); |
|
878 return ~((abi_ulong)0UL); |
|
879 } |
|
880 |
|
881 retval = lseek(interpreter_fd, interp_elf_ex->e_phoff, SEEK_SET); |
|
882 if(retval >= 0) { |
|
883 retval = read(interpreter_fd, |
|
884 (char *) elf_phdata, |
|
885 sizeof(struct elf_phdr) * interp_elf_ex->e_phnum); |
|
886 } |
|
887 if (retval < 0) { |
|
888 perror("load_elf_interp"); |
|
889 exit(-1); |
|
890 free (elf_phdata); |
|
891 return retval; |
|
892 } |
|
893 #ifdef BSWAP_NEEDED |
|
894 eppnt = elf_phdata; |
|
895 for (i=0; i<interp_elf_ex->e_phnum; i++, eppnt++) { |
|
896 bswap_phdr(eppnt); |
|
897 } |
|
898 #endif |
|
899 |
|
900 if (interp_elf_ex->e_type == ET_DYN) { |
|
901 /* in order to avoid hardcoding the interpreter load |
|
902 address in qemu, we allocate a big enough memory zone */ |
|
903 error = target_mmap(0, INTERP_MAP_SIZE, |
|
904 PROT_NONE, MAP_PRIVATE | MAP_ANON, |
|
905 -1, 0); |
|
906 if (error == -1) { |
|
907 perror("mmap"); |
|
908 exit(-1); |
|
909 } |
|
910 load_addr = error; |
|
911 load_addr_set = 1; |
|
912 } |
|
913 |
|
914 eppnt = elf_phdata; |
|
915 for(i=0; i<interp_elf_ex->e_phnum; i++, eppnt++) |
|
916 if (eppnt->p_type == PT_LOAD) { |
|
917 int elf_type = MAP_PRIVATE | MAP_DENYWRITE; |
|
918 int elf_prot = 0; |
|
919 abi_ulong vaddr = 0; |
|
920 abi_ulong k; |
|
921 |
|
922 if (eppnt->p_flags & PF_R) elf_prot = PROT_READ; |
|
923 if (eppnt->p_flags & PF_W) elf_prot |= PROT_WRITE; |
|
924 if (eppnt->p_flags & PF_X) elf_prot |= PROT_EXEC; |
|
925 if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) { |
|
926 elf_type |= MAP_FIXED; |
|
927 vaddr = eppnt->p_vaddr; |
|
928 } |
|
929 error = target_mmap(load_addr+TARGET_ELF_PAGESTART(vaddr), |
|
930 eppnt->p_filesz + TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr), |
|
931 elf_prot, |
|
932 elf_type, |
|
933 interpreter_fd, |
|
934 eppnt->p_offset - TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr)); |
|
935 |
|
936 if (error == -1) { |
|
937 /* Real error */ |
|
938 close(interpreter_fd); |
|
939 free(elf_phdata); |
|
940 return ~((abi_ulong)0UL); |
|
941 } |
|
942 |
|
943 if (!load_addr_set && interp_elf_ex->e_type == ET_DYN) { |
|
944 load_addr = error; |
|
945 load_addr_set = 1; |
|
946 } |
|
947 |
|
948 /* |
|
949 * Find the end of the file mapping for this phdr, and keep |
|
950 * track of the largest address we see for this. |
|
951 */ |
|
952 k = load_addr + eppnt->p_vaddr + eppnt->p_filesz; |
|
953 if (k > elf_bss) elf_bss = k; |
|
954 |
|
955 /* |
|
956 * Do the same thing for the memory mapping - between |
|
957 * elf_bss and last_bss is the bss section. |
|
958 */ |
|
959 k = load_addr + eppnt->p_memsz + eppnt->p_vaddr; |
|
960 if (k > last_bss) last_bss = k; |
|
961 } |
|
962 |
|
963 /* Now use mmap to map the library into memory. */ |
|
964 |
|
965 close(interpreter_fd); |
|
966 |
|
967 /* |
|
968 * Now fill out the bss section. First pad the last page up |
|
969 * to the page boundary, and then perform a mmap to make sure |
|
970 * that there are zeromapped pages up to and including the last |
|
971 * bss page. |
|
972 */ |
|
973 padzero(elf_bss, last_bss); |
|
974 elf_bss = TARGET_ELF_PAGESTART(elf_bss + qemu_host_page_size - 1); /* What we have mapped so far */ |
|
975 |
|
976 /* Map the last of the bss segment */ |
|
977 if (last_bss > elf_bss) { |
|
978 target_mmap(elf_bss, last_bss-elf_bss, |
|
979 PROT_READ|PROT_WRITE|PROT_EXEC, |
|
980 MAP_FIXED|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); |
|
981 } |
|
982 free(elf_phdata); |
|
983 |
|
984 *interp_load_addr = load_addr; |
|
985 return ((abi_ulong) interp_elf_ex->e_entry) + load_addr; |
|
986 } |
|
987 |
|
988 static int symfind(const void *s0, const void *s1) |
|
989 { |
|
990 struct elf_sym *key = (struct elf_sym *)s0; |
|
991 struct elf_sym *sym = (struct elf_sym *)s1; |
|
992 int result = 0; |
|
993 if (key->st_value < sym->st_value) { |
|
994 result = -1; |
|
995 } else if (key->st_value > sym->st_value + sym->st_size) { |
|
996 result = 1; |
|
997 } |
|
998 return result; |
|
999 } |
|
1000 |
|
1001 static const char *lookup_symbolxx(struct syminfo *s, target_ulong orig_addr) |
|
1002 { |
|
1003 #if ELF_CLASS == ELFCLASS32 |
|
1004 struct elf_sym *syms = s->disas_symtab.elf32; |
|
1005 #else |
|
1006 struct elf_sym *syms = s->disas_symtab.elf64; |
|
1007 #endif |
|
1008 |
|
1009 // binary search |
|
1010 struct elf_sym key; |
|
1011 struct elf_sym *sym; |
|
1012 |
|
1013 key.st_value = orig_addr; |
|
1014 |
|
1015 sym = bsearch(&key, syms, s->disas_num_syms, sizeof(*syms), symfind); |
|
1016 if (sym != 0) { |
|
1017 return s->disas_strtab + sym->st_name; |
|
1018 } |
|
1019 |
|
1020 return ""; |
|
1021 } |
|
1022 |
|
1023 /* FIXME: This should use elf_ops.h */ |
|
1024 static int symcmp(const void *s0, const void *s1) |
|
1025 { |
|
1026 struct elf_sym *sym0 = (struct elf_sym *)s0; |
|
1027 struct elf_sym *sym1 = (struct elf_sym *)s1; |
|
1028 return (sym0->st_value < sym1->st_value) |
|
1029 ? -1 |
|
1030 : ((sym0->st_value > sym1->st_value) ? 1 : 0); |
|
1031 } |
|
1032 |
|
1033 /* Best attempt to load symbols from this ELF object. */ |
|
1034 static void load_symbols(struct elfhdr *hdr, int fd) |
|
1035 { |
|
1036 unsigned int i, nsyms; |
|
1037 struct elf_shdr sechdr, symtab, strtab; |
|
1038 char *strings; |
|
1039 struct syminfo *s; |
|
1040 struct elf_sym *syms; |
|
1041 |
|
1042 lseek(fd, hdr->e_shoff, SEEK_SET); |
|
1043 for (i = 0; i < hdr->e_shnum; i++) { |
|
1044 if (read(fd, &sechdr, sizeof(sechdr)) != sizeof(sechdr)) |
|
1045 return; |
|
1046 #ifdef BSWAP_NEEDED |
|
1047 bswap_shdr(&sechdr); |
|
1048 #endif |
|
1049 if (sechdr.sh_type == SHT_SYMTAB) { |
|
1050 symtab = sechdr; |
|
1051 lseek(fd, hdr->e_shoff |
|
1052 + sizeof(sechdr) * sechdr.sh_link, SEEK_SET); |
|
1053 if (read(fd, &strtab, sizeof(strtab)) |
|
1054 != sizeof(strtab)) |
|
1055 return; |
|
1056 #ifdef BSWAP_NEEDED |
|
1057 bswap_shdr(&strtab); |
|
1058 #endif |
|
1059 goto found; |
|
1060 } |
|
1061 } |
|
1062 return; /* Shouldn't happen... */ |
|
1063 |
|
1064 found: |
|
1065 /* Now know where the strtab and symtab are. Snarf them. */ |
|
1066 s = malloc(sizeof(*s)); |
|
1067 syms = malloc(symtab.sh_size); |
|
1068 if (!syms) |
|
1069 return; |
|
1070 s->disas_strtab = strings = malloc(strtab.sh_size); |
|
1071 if (!s->disas_strtab) |
|
1072 return; |
|
1073 |
|
1074 lseek(fd, symtab.sh_offset, SEEK_SET); |
|
1075 if (read(fd, syms, symtab.sh_size) != symtab.sh_size) |
|
1076 return; |
|
1077 |
|
1078 nsyms = symtab.sh_size / sizeof(struct elf_sym); |
|
1079 |
|
1080 i = 0; |
|
1081 while (i < nsyms) { |
|
1082 #ifdef BSWAP_NEEDED |
|
1083 bswap_sym(syms + i); |
|
1084 #endif |
|
1085 // Throw away entries which we do not need. |
|
1086 if (syms[i].st_shndx == SHN_UNDEF || |
|
1087 syms[i].st_shndx >= SHN_LORESERVE || |
|
1088 ELF_ST_TYPE(syms[i].st_info) != STT_FUNC) { |
|
1089 nsyms--; |
|
1090 if (i < nsyms) { |
|
1091 syms[i] = syms[nsyms]; |
|
1092 } |
|
1093 continue; |
|
1094 } |
|
1095 #if defined(TARGET_ARM) || defined (TARGET_MIPS) |
|
1096 /* The bottom address bit marks a Thumb or MIPS16 symbol. */ |
|
1097 syms[i].st_value &= ~(target_ulong)1; |
|
1098 #endif |
|
1099 i++; |
|
1100 } |
|
1101 syms = realloc(syms, nsyms * sizeof(*syms)); |
|
1102 |
|
1103 qsort(syms, nsyms, sizeof(*syms), symcmp); |
|
1104 |
|
1105 lseek(fd, strtab.sh_offset, SEEK_SET); |
|
1106 if (read(fd, strings, strtab.sh_size) != strtab.sh_size) |
|
1107 return; |
|
1108 s->disas_num_syms = nsyms; |
|
1109 #if ELF_CLASS == ELFCLASS32 |
|
1110 s->disas_symtab.elf32 = syms; |
|
1111 s->lookup_symbol = lookup_symbolxx; |
|
1112 #else |
|
1113 s->disas_symtab.elf64 = syms; |
|
1114 s->lookup_symbol = lookup_symbolxx; |
|
1115 #endif |
|
1116 s->next = syminfos; |
|
1117 syminfos = s; |
|
1118 } |
|
1119 |
|
1120 int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs, |
|
1121 struct image_info * info) |
|
1122 { |
|
1123 struct elfhdr elf_ex; |
|
1124 struct elfhdr interp_elf_ex; |
|
1125 struct exec interp_ex; |
|
1126 int interpreter_fd = -1; /* avoid warning */ |
|
1127 abi_ulong load_addr, load_bias; |
|
1128 int load_addr_set = 0; |
|
1129 unsigned int interpreter_type = INTERPRETER_NONE; |
|
1130 unsigned char ibcs2_interpreter; |
|
1131 int i; |
|
1132 abi_ulong mapped_addr; |
|
1133 struct elf_phdr * elf_ppnt; |
|
1134 struct elf_phdr *elf_phdata; |
|
1135 abi_ulong elf_bss, k, elf_brk; |
|
1136 int retval; |
|
1137 char * elf_interpreter; |
|
1138 abi_ulong elf_entry, interp_load_addr = 0; |
|
1139 int status; |
|
1140 abi_ulong start_code, end_code, start_data, end_data; |
|
1141 abi_ulong reloc_func_desc = 0; |
|
1142 abi_ulong elf_stack; |
|
1143 char passed_fileno[6]; |
|
1144 |
|
1145 ibcs2_interpreter = 0; |
|
1146 status = 0; |
|
1147 load_addr = 0; |
|
1148 load_bias = 0; |
|
1149 elf_ex = *((struct elfhdr *) bprm->buf); /* exec-header */ |
|
1150 #ifdef BSWAP_NEEDED |
|
1151 bswap_ehdr(&elf_ex); |
|
1152 #endif |
|
1153 |
|
1154 /* First of all, some simple consistency checks */ |
|
1155 if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) || |
|
1156 (! elf_check_arch(elf_ex.e_machine))) { |
|
1157 return -ENOEXEC; |
|
1158 } |
|
1159 |
|
1160 bprm->p = copy_elf_strings(1, &bprm->filename, bprm->page, bprm->p); |
|
1161 bprm->p = copy_elf_strings(bprm->envc,bprm->envp,bprm->page,bprm->p); |
|
1162 bprm->p = copy_elf_strings(bprm->argc,bprm->argv,bprm->page,bprm->p); |
|
1163 if (!bprm->p) { |
|
1164 retval = -E2BIG; |
|
1165 } |
|
1166 |
|
1167 /* Now read in all of the header information */ |
|
1168 elf_phdata = (struct elf_phdr *)malloc(elf_ex.e_phentsize*elf_ex.e_phnum); |
|
1169 if (elf_phdata == NULL) { |
|
1170 return -ENOMEM; |
|
1171 } |
|
1172 |
|
1173 retval = lseek(bprm->fd, elf_ex.e_phoff, SEEK_SET); |
|
1174 if(retval > 0) { |
|
1175 retval = read(bprm->fd, (char *) elf_phdata, |
|
1176 elf_ex.e_phentsize * elf_ex.e_phnum); |
|
1177 } |
|
1178 |
|
1179 if (retval < 0) { |
|
1180 perror("load_elf_binary"); |
|
1181 exit(-1); |
|
1182 free (elf_phdata); |
|
1183 return -errno; |
|
1184 } |
|
1185 |
|
1186 #ifdef BSWAP_NEEDED |
|
1187 elf_ppnt = elf_phdata; |
|
1188 for (i=0; i<elf_ex.e_phnum; i++, elf_ppnt++) { |
|
1189 bswap_phdr(elf_ppnt); |
|
1190 } |
|
1191 #endif |
|
1192 elf_ppnt = elf_phdata; |
|
1193 |
|
1194 elf_bss = 0; |
|
1195 elf_brk = 0; |
|
1196 |
|
1197 |
|
1198 elf_stack = ~((abi_ulong)0UL); |
|
1199 elf_interpreter = NULL; |
|
1200 start_code = ~((abi_ulong)0UL); |
|
1201 end_code = 0; |
|
1202 start_data = 0; |
|
1203 end_data = 0; |
|
1204 interp_ex.a_info = 0; |
|
1205 |
|
1206 for(i=0;i < elf_ex.e_phnum; i++) { |
|
1207 if (elf_ppnt->p_type == PT_INTERP) { |
|
1208 if ( elf_interpreter != NULL ) |
|
1209 { |
|
1210 free (elf_phdata); |
|
1211 free(elf_interpreter); |
|
1212 close(bprm->fd); |
|
1213 return -EINVAL; |
|
1214 } |
|
1215 |
|
1216 /* This is the program interpreter used for |
|
1217 * shared libraries - for now assume that this |
|
1218 * is an a.out format binary |
|
1219 */ |
|
1220 |
|
1221 elf_interpreter = (char *)malloc(elf_ppnt->p_filesz); |
|
1222 |
|
1223 if (elf_interpreter == NULL) { |
|
1224 free (elf_phdata); |
|
1225 close(bprm->fd); |
|
1226 return -ENOMEM; |
|
1227 } |
|
1228 |
|
1229 retval = lseek(bprm->fd, elf_ppnt->p_offset, SEEK_SET); |
|
1230 if(retval >= 0) { |
|
1231 retval = read(bprm->fd, elf_interpreter, elf_ppnt->p_filesz); |
|
1232 } |
|
1233 if(retval < 0) { |
|
1234 perror("load_elf_binary2"); |
|
1235 exit(-1); |
|
1236 } |
|
1237 |
|
1238 /* If the program interpreter is one of these two, |
|
1239 then assume an iBCS2 image. Otherwise assume |
|
1240 a native linux image. */ |
|
1241 |
|
1242 /* JRP - Need to add X86 lib dir stuff here... */ |
|
1243 |
|
1244 if (strcmp(elf_interpreter,"/usr/lib/libc.so.1") == 0 || |
|
1245 strcmp(elf_interpreter,"/usr/lib/ld.so.1") == 0) { |
|
1246 ibcs2_interpreter = 1; |
|
1247 } |
|
1248 |
|
1249 #if 0 |
|
1250 printf("Using ELF interpreter %s\n", elf_interpreter); |
|
1251 #endif |
|
1252 if (retval >= 0) { |
|
1253 retval = open(path(elf_interpreter), O_RDONLY); |
|
1254 if(retval >= 0) { |
|
1255 interpreter_fd = retval; |
|
1256 } |
|
1257 else { |
|
1258 perror(elf_interpreter); |
|
1259 exit(-1); |
|
1260 /* retval = -errno; */ |
|
1261 } |
|
1262 } |
|
1263 |
|
1264 if (retval >= 0) { |
|
1265 retval = lseek(interpreter_fd, 0, SEEK_SET); |
|
1266 if(retval >= 0) { |
|
1267 retval = read(interpreter_fd,bprm->buf,128); |
|
1268 } |
|
1269 } |
|
1270 if (retval >= 0) { |
|
1271 interp_ex = *((struct exec *) bprm->buf); /* aout exec-header */ |
|
1272 interp_elf_ex=*((struct elfhdr *) bprm->buf); /* elf exec-header */ |
|
1273 } |
|
1274 if (retval < 0) { |
|
1275 perror("load_elf_binary3"); |
|
1276 exit(-1); |
|
1277 free (elf_phdata); |
|
1278 free(elf_interpreter); |
|
1279 close(bprm->fd); |
|
1280 return retval; |
|
1281 } |
|
1282 } |
|
1283 elf_ppnt++; |
|
1284 } |
|
1285 |
|
1286 /* Some simple consistency checks for the interpreter */ |
|
1287 if (elf_interpreter){ |
|
1288 interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT; |
|
1289 |
|
1290 /* Now figure out which format our binary is */ |
|
1291 if ((N_MAGIC(interp_ex) != OMAGIC) && (N_MAGIC(interp_ex) != ZMAGIC) && |
|
1292 (N_MAGIC(interp_ex) != QMAGIC)) { |
|
1293 interpreter_type = INTERPRETER_ELF; |
|
1294 } |
|
1295 |
|
1296 if (interp_elf_ex.e_ident[0] != 0x7f || |
|
1297 strncmp((char *)&interp_elf_ex.e_ident[1], "ELF",3) != 0) { |
|
1298 interpreter_type &= ~INTERPRETER_ELF; |
|
1299 } |
|
1300 |
|
1301 if (!interpreter_type) { |
|
1302 free(elf_interpreter); |
|
1303 free(elf_phdata); |
|
1304 close(bprm->fd); |
|
1305 return -ELIBBAD; |
|
1306 } |
|
1307 } |
|
1308 |
|
1309 /* OK, we are done with that, now set up the arg stuff, |
|
1310 and then start this sucker up */ |
|
1311 |
|
1312 { |
|
1313 char * passed_p; |
|
1314 |
|
1315 if (interpreter_type == INTERPRETER_AOUT) { |
|
1316 snprintf(passed_fileno, sizeof(passed_fileno), "%d", bprm->fd); |
|
1317 passed_p = passed_fileno; |
|
1318 |
|
1319 if (elf_interpreter) { |
|
1320 bprm->p = copy_elf_strings(1,&passed_p,bprm->page,bprm->p); |
|
1321 bprm->argc++; |
|
1322 } |
|
1323 } |
|
1324 if (!bprm->p) { |
|
1325 if (elf_interpreter) { |
|
1326 free(elf_interpreter); |
|
1327 } |
|
1328 free (elf_phdata); |
|
1329 close(bprm->fd); |
|
1330 return -E2BIG; |
|
1331 } |
|
1332 } |
|
1333 |
|
1334 /* OK, This is the point of no return */ |
|
1335 info->end_data = 0; |
|
1336 info->end_code = 0; |
|
1337 info->start_mmap = (abi_ulong)ELF_START_MMAP; |
|
1338 info->mmap = 0; |
|
1339 info->elf_flags = elf_ex.e_flags; |
|
1340 elf_entry = (abi_ulong) elf_ex.e_entry; |
|
1341 |
|
1342 /* Do this so that we can load the interpreter, if need be. We will |
|
1343 change some of these later */ |
|
1344 info->rss = 0; |
|
1345 bprm->p = setup_arg_pages(bprm->p, bprm, info); |
|
1346 info->start_stack = bprm->p; |
|
1347 |
|
1348 /* Now we do a little grungy work by mmaping the ELF image into |
|
1349 * the correct location in memory. At this point, we assume that |
|
1350 * the image should be loaded at fixed address, not at a variable |
|
1351 * address. |
|
1352 */ |
|
1353 |
|
1354 for(i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum; i++, elf_ppnt++) { |
|
1355 int elf_prot = 0; |
|
1356 int elf_flags = 0; |
|
1357 abi_ulong error; |
|
1358 |
|
1359 if (elf_ppnt->p_type != PT_LOAD) |
|
1360 continue; |
|
1361 |
|
1362 if (elf_ppnt->p_flags & PF_R) elf_prot |= PROT_READ; |
|
1363 if (elf_ppnt->p_flags & PF_W) elf_prot |= PROT_WRITE; |
|
1364 if (elf_ppnt->p_flags & PF_X) elf_prot |= PROT_EXEC; |
|
1365 elf_flags = MAP_PRIVATE | MAP_DENYWRITE; |
|
1366 if (elf_ex.e_type == ET_EXEC || load_addr_set) { |
|
1367 elf_flags |= MAP_FIXED; |
|
1368 } else if (elf_ex.e_type == ET_DYN) { |
|
1369 /* Try and get dynamic programs out of the way of the default mmap |
|
1370 base, as well as whatever program they might try to exec. This |
|
1371 is because the brk will follow the loader, and is not movable. */ |
|
1372 /* NOTE: for qemu, we do a big mmap to get enough space |
|
1373 without hardcoding any address */ |
|
1374 error = target_mmap(0, ET_DYN_MAP_SIZE, |
|
1375 PROT_NONE, MAP_PRIVATE | MAP_ANON, |
|
1376 -1, 0); |
|
1377 if (error == -1) { |
|
1378 perror("mmap"); |
|
1379 exit(-1); |
|
1380 } |
|
1381 load_bias = TARGET_ELF_PAGESTART(error - elf_ppnt->p_vaddr); |
|
1382 } |
|
1383 |
|
1384 error = target_mmap(TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr), |
|
1385 (elf_ppnt->p_filesz + |
|
1386 TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)), |
|
1387 elf_prot, |
|
1388 (MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE), |
|
1389 bprm->fd, |
|
1390 (elf_ppnt->p_offset - |
|
1391 TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr))); |
|
1392 if (error == -1) { |
|
1393 perror("mmap"); |
|
1394 exit(-1); |
|
1395 } |
|
1396 |
|
1397 #ifdef LOW_ELF_STACK |
|
1398 if (TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr) < elf_stack) |
|
1399 elf_stack = TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr); |
|
1400 #endif |
|
1401 |
|
1402 if (!load_addr_set) { |
|
1403 load_addr_set = 1; |
|
1404 load_addr = elf_ppnt->p_vaddr - elf_ppnt->p_offset; |
|
1405 if (elf_ex.e_type == ET_DYN) { |
|
1406 load_bias += error - |
|
1407 TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr); |
|
1408 load_addr += load_bias; |
|
1409 reloc_func_desc = load_bias; |
|
1410 } |
|
1411 } |
|
1412 k = elf_ppnt->p_vaddr; |
|
1413 if (k < start_code) |
|
1414 start_code = k; |
|
1415 if (start_data < k) |
|
1416 start_data = k; |
|
1417 k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz; |
|
1418 if (k > elf_bss) |
|
1419 elf_bss = k; |
|
1420 if ((elf_ppnt->p_flags & PF_X) && end_code < k) |
|
1421 end_code = k; |
|
1422 if (end_data < k) |
|
1423 end_data = k; |
|
1424 k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz; |
|
1425 if (k > elf_brk) elf_brk = k; |
|
1426 } |
|
1427 |
|
1428 elf_entry += load_bias; |
|
1429 elf_bss += load_bias; |
|
1430 elf_brk += load_bias; |
|
1431 start_code += load_bias; |
|
1432 end_code += load_bias; |
|
1433 start_data += load_bias; |
|
1434 end_data += load_bias; |
|
1435 |
|
1436 if (elf_interpreter) { |
|
1437 if (interpreter_type & 1) { |
|
1438 elf_entry = load_aout_interp(&interp_ex, interpreter_fd); |
|
1439 } |
|
1440 else if (interpreter_type & 2) { |
|
1441 elf_entry = load_elf_interp(&interp_elf_ex, interpreter_fd, |
|
1442 &interp_load_addr); |
|
1443 } |
|
1444 reloc_func_desc = interp_load_addr; |
|
1445 |
|
1446 close(interpreter_fd); |
|
1447 free(elf_interpreter); |
|
1448 |
|
1449 if (elf_entry == ~((abi_ulong)0UL)) { |
|
1450 printf("Unable to load interpreter\n"); |
|
1451 free(elf_phdata); |
|
1452 exit(-1); |
|
1453 return 0; |
|
1454 } |
|
1455 } |
|
1456 |
|
1457 free(elf_phdata); |
|
1458 |
|
1459 if (loglevel) |
|
1460 load_symbols(&elf_ex, bprm->fd); |
|
1461 |
|
1462 if (interpreter_type != INTERPRETER_AOUT) close(bprm->fd); |
|
1463 info->personality = (ibcs2_interpreter ? PER_SVR4 : PER_LINUX); |
|
1464 |
|
1465 #ifdef LOW_ELF_STACK |
|
1466 info->start_stack = bprm->p = elf_stack - 4; |
|
1467 #endif |
|
1468 bprm->p = create_elf_tables(bprm->p, |
|
1469 bprm->argc, |
|
1470 bprm->envc, |
|
1471 &elf_ex, |
|
1472 load_addr, load_bias, |
|
1473 interp_load_addr, |
|
1474 (interpreter_type == INTERPRETER_AOUT ? 0 : 1), |
|
1475 info); |
|
1476 info->load_addr = reloc_func_desc; |
|
1477 info->start_brk = info->brk = elf_brk; |
|
1478 info->end_code = end_code; |
|
1479 info->start_code = start_code; |
|
1480 info->start_data = start_data; |
|
1481 info->end_data = end_data; |
|
1482 info->start_stack = bprm->p; |
|
1483 |
|
1484 /* Calling set_brk effectively mmaps the pages that we need for the bss and break |
|
1485 sections */ |
|
1486 set_brk(elf_bss, elf_brk); |
|
1487 |
|
1488 padzero(elf_bss, elf_brk); |
|
1489 |
|
1490 #if 0 |
|
1491 printf("(start_brk) %x\n" , info->start_brk); |
|
1492 printf("(end_code) %x\n" , info->end_code); |
|
1493 printf("(start_code) %x\n" , info->start_code); |
|
1494 printf("(end_data) %x\n" , info->end_data); |
|
1495 printf("(start_stack) %x\n" , info->start_stack); |
|
1496 printf("(brk) %x\n" , info->brk); |
|
1497 #endif |
|
1498 |
|
1499 if ( info->personality == PER_SVR4 ) |
|
1500 { |
|
1501 /* Why this, you ask??? Well SVr4 maps page 0 as read-only, |
|
1502 and some applications "depend" upon this behavior. |
|
1503 Since we do not have the power to recompile these, we |
|
1504 emulate the SVr4 behavior. Sigh. */ |
|
1505 mapped_addr = target_mmap(0, qemu_host_page_size, PROT_READ | PROT_EXEC, |
|
1506 MAP_FIXED | MAP_PRIVATE, -1, 0); |
|
1507 } |
|
1508 |
|
1509 info->entry = elf_entry; |
|
1510 |
|
1511 return 0; |
|
1512 } |
|
1513 |
|
1514 static int load_aout_interp(void * exptr, int interp_fd) |
|
1515 { |
|
1516 printf("a.out interpreter not yet supported\n"); |
|
1517 return(0); |
|
1518 } |
|
1519 |
|
1520 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop) |
|
1521 { |
|
1522 init_thread(regs, infop); |
|
1523 } |