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1 /****************************************************************************/ |
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2 /* |
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3 * QEMU bFLT binary loader. Based on linux/fs/binfmt_flat.c |
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4 * |
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5 * This program is free software; you can redistribute it and/or modify |
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6 * it under the terms of the GNU General Public License as published by |
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7 * the Free Software Foundation; either version 2 of the License, or |
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8 * (at your option) any later version. |
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9 * |
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10 * This program is distributed in the hope that it will be useful, |
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 * GNU General Public License for more details. |
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14 * |
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15 * You should have received a copy of the GNU General Public License |
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16 * along with this program; if not, write to the Free Software |
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17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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18 * |
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19 * Copyright (C) 2006 CodeSourcery. |
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20 * Copyright (C) 2000-2003 David McCullough <davidm@snapgear.com> |
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21 * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com> |
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22 * Copyright (C) 2002 SnapGear, by Paul Dale <pauli@snapgear.com> |
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23 * Copyright (C) 2000, 2001 Lineo, by David McCullough <davidm@lineo.com> |
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24 * based heavily on: |
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25 * |
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26 * linux/fs/binfmt_aout.c: |
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27 * Copyright (C) 1991, 1992, 1996 Linus Torvalds |
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28 * linux/fs/binfmt_flat.c for 2.0 kernel |
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29 * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com> |
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30 * JAN/99 -- coded full program relocation (gerg@snapgear.com) |
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31 */ |
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32 |
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33 /* ??? ZFLAT and shared library support is currently disabled. */ |
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34 |
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35 /****************************************************************************/ |
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36 |
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37 #include <stdio.h> |
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38 #include <stdlib.h> |
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39 #include <errno.h> |
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40 #include <sys/mman.h> |
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41 #include <unistd.h> |
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42 |
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43 #include "qemu.h" |
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44 #include "flat.h" |
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45 |
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46 //#define DEBUG |
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47 |
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48 #ifdef DEBUG |
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49 #define DBG_FLT(a...) printf(a) |
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50 #else |
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51 #define DBG_FLT(a...) |
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52 #endif |
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53 |
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54 #define flat_reloc_valid(reloc, size) ((reloc) <= (size)) |
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55 #define flat_old_ram_flag(flag) (flag) |
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56 #ifdef TARGET_WORDS_BIGENDIAN |
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57 #define flat_get_relocate_addr(relval) (relval) |
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58 #else |
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59 #define flat_get_relocate_addr(relval) bswap32(relval) |
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60 #endif |
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61 |
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62 #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */ |
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63 #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */ |
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64 |
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65 struct lib_info { |
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66 abi_ulong start_code; /* Start of text segment */ |
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67 abi_ulong start_data; /* Start of data segment */ |
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68 abi_ulong end_data; /* Start of bss section */ |
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69 abi_ulong start_brk; /* End of data segment */ |
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70 abi_ulong text_len; /* Length of text segment */ |
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71 abi_ulong entry; /* Start address for this module */ |
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72 abi_ulong build_date; /* When this one was compiled */ |
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73 short loaded; /* Has this library been loaded? */ |
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74 }; |
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75 |
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76 #ifdef CONFIG_BINFMT_SHARED_FLAT |
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77 static int load_flat_shared_library(int id, struct lib_info *p); |
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78 #endif |
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79 |
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80 struct linux_binprm; |
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81 |
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82 #define ntohl(x) be32_to_cpu(x) |
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83 |
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84 /****************************************************************************/ |
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85 /* |
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86 * create_flat_tables() parses the env- and arg-strings in new user |
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87 * memory and creates the pointer tables from them, and puts their |
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88 * addresses on the "stack", returning the new stack pointer value. |
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89 */ |
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90 |
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91 /* Push a block of strings onto the guest stack. */ |
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92 static abi_ulong copy_strings(abi_ulong p, int n, char **s) |
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93 { |
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94 int len; |
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95 |
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96 while (n-- > 0) { |
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97 len = strlen(s[n]) + 1; |
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98 p -= len; |
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99 memcpy_to_target(p, s[n], len); |
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100 } |
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101 |
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102 return p; |
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103 } |
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104 |
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105 static int target_pread(int fd, abi_ulong ptr, abi_ulong len, |
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106 abi_ulong offset) |
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107 { |
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108 void *buf; |
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109 int ret; |
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110 |
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111 buf = lock_user(VERIFY_WRITE, ptr, len, 0); |
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112 ret = pread(fd, buf, len, offset); |
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113 unlock_user(buf, ptr, len); |
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114 return ret; |
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115 } |
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116 /****************************************************************************/ |
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117 |
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118 #ifdef CONFIG_BINFMT_ZFLAT |
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119 |
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120 #include <linux/zlib.h> |
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121 |
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122 #define LBUFSIZE 4000 |
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123 |
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124 /* gzip flag byte */ |
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125 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */ |
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126 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */ |
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127 #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ |
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128 #define ORIG_NAME 0x08 /* bit 3 set: original file name present */ |
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129 #define COMMENT 0x10 /* bit 4 set: file comment present */ |
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130 #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */ |
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131 #define RESERVED 0xC0 /* bit 6,7: reserved */ |
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132 |
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133 static int decompress_exec( |
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134 struct linux_binprm *bprm, |
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135 unsigned long offset, |
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136 char *dst, |
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137 long len, |
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138 int fd) |
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139 { |
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140 unsigned char *buf; |
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141 z_stream strm; |
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142 loff_t fpos; |
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143 int ret, retval; |
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144 |
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145 DBG_FLT("decompress_exec(offset=%x,buf=%x,len=%x)\n",(int)offset, (int)dst, (int)len); |
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146 |
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147 memset(&strm, 0, sizeof(strm)); |
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148 strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL); |
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149 if (strm.workspace == NULL) { |
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150 DBG_FLT("binfmt_flat: no memory for decompress workspace\n"); |
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151 return -ENOMEM; |
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152 } |
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153 buf = kmalloc(LBUFSIZE, GFP_KERNEL); |
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154 if (buf == NULL) { |
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155 DBG_FLT("binfmt_flat: no memory for read buffer\n"); |
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156 retval = -ENOMEM; |
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157 goto out_free; |
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158 } |
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159 |
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160 /* Read in first chunk of data and parse gzip header. */ |
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161 fpos = offset; |
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162 ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos); |
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163 |
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164 strm.next_in = buf; |
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165 strm.avail_in = ret; |
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166 strm.total_in = 0; |
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167 |
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168 retval = -ENOEXEC; |
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169 |
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170 /* Check minimum size -- gzip header */ |
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171 if (ret < 10) { |
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172 DBG_FLT("binfmt_flat: file too small?\n"); |
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173 goto out_free_buf; |
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174 } |
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175 |
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176 /* Check gzip magic number */ |
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177 if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) { |
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178 DBG_FLT("binfmt_flat: unknown compression magic?\n"); |
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179 goto out_free_buf; |
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180 } |
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181 |
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182 /* Check gzip method */ |
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183 if (buf[2] != 8) { |
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184 DBG_FLT("binfmt_flat: unknown compression method?\n"); |
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185 goto out_free_buf; |
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186 } |
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187 /* Check gzip flags */ |
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188 if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) || |
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189 (buf[3] & RESERVED)) { |
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190 DBG_FLT("binfmt_flat: unknown flags?\n"); |
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191 goto out_free_buf; |
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192 } |
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193 |
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194 ret = 10; |
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195 if (buf[3] & EXTRA_FIELD) { |
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196 ret += 2 + buf[10] + (buf[11] << 8); |
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197 if (unlikely(LBUFSIZE == ret)) { |
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198 DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n"); |
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199 goto out_free_buf; |
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200 } |
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201 } |
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202 if (buf[3] & ORIG_NAME) { |
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203 for (; ret < LBUFSIZE && (buf[ret] != 0); ret++) |
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204 ; |
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205 if (unlikely(LBUFSIZE == ret)) { |
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206 DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n"); |
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207 goto out_free_buf; |
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208 } |
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209 } |
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210 if (buf[3] & COMMENT) { |
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211 for (; ret < LBUFSIZE && (buf[ret] != 0); ret++) |
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212 ; |
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213 if (unlikely(LBUFSIZE == ret)) { |
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214 DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n"); |
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215 goto out_free_buf; |
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216 } |
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217 } |
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218 |
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219 strm.next_in += ret; |
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220 strm.avail_in -= ret; |
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221 |
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222 strm.next_out = dst; |
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223 strm.avail_out = len; |
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224 strm.total_out = 0; |
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225 |
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226 if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) { |
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227 DBG_FLT("binfmt_flat: zlib init failed?\n"); |
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228 goto out_free_buf; |
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229 } |
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230 |
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231 while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) { |
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232 ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos); |
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233 if (ret <= 0) |
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234 break; |
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235 if (ret >= (unsigned long) -4096) |
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236 break; |
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237 len -= ret; |
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238 |
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239 strm.next_in = buf; |
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240 strm.avail_in = ret; |
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241 strm.total_in = 0; |
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242 } |
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243 |
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244 if (ret < 0) { |
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245 DBG_FLT("binfmt_flat: decompression failed (%d), %s\n", |
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246 ret, strm.msg); |
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247 goto out_zlib; |
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248 } |
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249 |
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250 retval = 0; |
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251 out_zlib: |
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252 zlib_inflateEnd(&strm); |
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253 out_free_buf: |
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254 kfree(buf); |
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255 out_free: |
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256 kfree(strm.workspace); |
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257 out: |
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258 return retval; |
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259 } |
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260 |
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261 #endif /* CONFIG_BINFMT_ZFLAT */ |
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262 |
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263 /****************************************************************************/ |
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264 |
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265 static abi_ulong |
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266 calc_reloc(abi_ulong r, struct lib_info *p, int curid, int internalp) |
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267 { |
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268 abi_ulong addr; |
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269 int id; |
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270 abi_ulong start_brk; |
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271 abi_ulong start_data; |
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272 abi_ulong text_len; |
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273 abi_ulong start_code; |
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274 |
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275 #ifdef CONFIG_BINFMT_SHARED_FLAT |
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276 #error needs checking |
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277 if (r == 0) |
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278 id = curid; /* Relocs of 0 are always self referring */ |
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279 else { |
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280 id = (r >> 24) & 0xff; /* Find ID for this reloc */ |
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281 r &= 0x00ffffff; /* Trim ID off here */ |
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282 } |
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283 if (id >= MAX_SHARED_LIBS) { |
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284 fprintf(stderr, "BINFMT_FLAT: reference 0x%x to shared library %d\n", |
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285 (unsigned) r, id); |
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286 goto failed; |
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287 } |
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288 if (curid != id) { |
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289 if (internalp) { |
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290 fprintf(stderr, "BINFMT_FLAT: reloc address 0x%x not " |
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291 "in same module (%d != %d)\n", |
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292 (unsigned) r, curid, id); |
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293 goto failed; |
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294 } else if ( ! p[id].loaded && |
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295 load_flat_shared_library(id, p) > (unsigned long) -4096) { |
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296 fprintf(stderr, "BINFMT_FLAT: failed to load library %d\n", id); |
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297 goto failed; |
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298 } |
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299 /* Check versioning information (i.e. time stamps) */ |
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300 if (p[id].build_date && p[curid].build_date |
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301 && p[curid].build_date < p[id].build_date) { |
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302 fprintf(stderr, "BINFMT_FLAT: library %d is younger than %d\n", |
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303 id, curid); |
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304 goto failed; |
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305 } |
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306 } |
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307 #else |
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308 id = 0; |
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309 #endif |
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310 |
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311 start_brk = p[id].start_brk; |
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312 start_data = p[id].start_data; |
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313 start_code = p[id].start_code; |
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314 text_len = p[id].text_len; |
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315 |
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316 if (!flat_reloc_valid(r, start_brk - start_data + text_len)) { |
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317 fprintf(stderr, "BINFMT_FLAT: reloc outside program 0x%x " |
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318 "(0 - 0x%x/0x%x)\n", |
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319 (int) r,(int)(start_brk-start_code),(int)text_len); |
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320 goto failed; |
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321 } |
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322 |
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323 if (r < text_len) /* In text segment */ |
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324 addr = r + start_code; |
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325 else /* In data segment */ |
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326 addr = r - text_len + start_data; |
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327 |
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328 /* Range checked already above so doing the range tests is redundant...*/ |
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329 return(addr); |
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330 |
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331 failed: |
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332 abort(); |
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333 return RELOC_FAILED; |
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334 } |
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335 |
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336 /****************************************************************************/ |
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337 |
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338 /* ??? This does not handle endianness correctly. */ |
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339 static void old_reloc(struct lib_info *libinfo, uint32_t rl) |
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340 { |
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341 #ifdef DEBUG |
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342 char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" }; |
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343 #endif |
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344 uint32_t *ptr; |
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345 uint32_t offset; |
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346 int reloc_type; |
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347 |
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348 offset = rl & 0x3fffffff; |
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349 reloc_type = rl >> 30; |
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350 /* ??? How to handle this? */ |
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351 #if defined(CONFIG_COLDFIRE) |
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352 ptr = (uint32_t *) ((unsigned long) libinfo->start_code + offset); |
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353 #else |
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354 ptr = (uint32_t *) ((unsigned long) libinfo->start_data + offset); |
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355 #endif |
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356 |
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357 #ifdef DEBUG |
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358 fprintf(stderr, "Relocation of variable at DATASEG+%x " |
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359 "(address %p, currently %x) into segment %s\n", |
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360 offset, ptr, (int)*ptr, segment[reloc_type]); |
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361 #endif |
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362 |
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363 switch (reloc_type) { |
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364 case OLD_FLAT_RELOC_TYPE_TEXT: |
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365 *ptr += libinfo->start_code; |
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366 break; |
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367 case OLD_FLAT_RELOC_TYPE_DATA: |
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368 *ptr += libinfo->start_data; |
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369 break; |
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370 case OLD_FLAT_RELOC_TYPE_BSS: |
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371 *ptr += libinfo->end_data; |
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372 break; |
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373 default: |
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374 fprintf(stderr, "BINFMT_FLAT: Unknown relocation type=%x\n", |
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375 reloc_type); |
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376 break; |
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377 } |
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378 DBG_FLT("Relocation became %x\n", (int)*ptr); |
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379 } |
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380 |
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381 /****************************************************************************/ |
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382 |
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383 static int load_flat_file(struct linux_binprm * bprm, |
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384 struct lib_info *libinfo, int id, abi_ulong *extra_stack) |
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385 { |
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386 struct flat_hdr * hdr; |
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387 abi_ulong textpos = 0, datapos = 0, result; |
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388 abi_ulong realdatastart = 0; |
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389 abi_ulong text_len, data_len, bss_len, stack_len, flags; |
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390 abi_ulong memp = 0; /* for finding the brk area */ |
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391 abi_ulong extra; |
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392 abi_ulong reloc = 0, rp; |
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393 int i, rev, relocs = 0; |
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394 abi_ulong fpos; |
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395 abi_ulong start_code, end_code; |
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396 abi_ulong indx_len; |
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397 |
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398 hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */ |
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399 |
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400 text_len = ntohl(hdr->data_start); |
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401 data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start); |
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402 bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end); |
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403 stack_len = ntohl(hdr->stack_size); |
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404 if (extra_stack) { |
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405 stack_len += *extra_stack; |
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406 *extra_stack = stack_len; |
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407 } |
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408 relocs = ntohl(hdr->reloc_count); |
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409 flags = ntohl(hdr->flags); |
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410 rev = ntohl(hdr->rev); |
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411 |
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412 DBG_FLT("BINFMT_FLAT: Loading file: %s\n", bprm->filename); |
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413 |
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414 if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) { |
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415 fprintf(stderr, "BINFMT_FLAT: bad magic/rev (0x%x, need 0x%x)\n", |
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416 rev, (int) FLAT_VERSION); |
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417 return -ENOEXEC; |
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418 } |
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419 |
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420 /* Don't allow old format executables to use shared libraries */ |
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421 if (rev == OLD_FLAT_VERSION && id != 0) { |
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422 fprintf(stderr, "BINFMT_FLAT: shared libraries are not available\n"); |
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423 return -ENOEXEC; |
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424 } |
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425 |
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426 /* |
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427 * fix up the flags for the older format, there were all kinds |
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428 * of endian hacks, this only works for the simple cases |
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429 */ |
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430 if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags)) |
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431 flags = FLAT_FLAG_RAM; |
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432 |
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433 #ifndef CONFIG_BINFMT_ZFLAT |
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434 if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) { |
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435 fprintf(stderr, "Support for ZFLAT executables is not enabled\n"); |
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436 return -ENOEXEC; |
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437 } |
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438 #endif |
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439 |
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440 /* |
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441 * calculate the extra space we need to map in |
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442 */ |
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443 extra = relocs * sizeof(abi_ulong); |
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444 if (extra < bss_len + stack_len) |
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445 extra = bss_len + stack_len; |
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446 |
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447 /* Add space for library base pointers. Make sure this does not |
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448 misalign the doesn't misalign the data segment. */ |
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449 indx_len = MAX_SHARED_LIBS * sizeof(abi_ulong); |
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450 indx_len = (indx_len + 15) & ~(abi_ulong)15; |
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451 |
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452 /* |
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453 * there are a couple of cases here, the separate code/data |
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454 * case, and then the fully copied to RAM case which lumps |
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455 * it all together. |
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456 */ |
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457 if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) { |
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458 /* |
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459 * this should give us a ROM ptr, but if it doesn't we don't |
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460 * really care |
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461 */ |
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462 DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n"); |
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463 |
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464 textpos = target_mmap(0, text_len, PROT_READ|PROT_EXEC, |
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465 MAP_PRIVATE, bprm->fd, 0); |
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466 if (textpos == -1) { |
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467 fprintf(stderr, "Unable to mmap process text\n"); |
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468 return -1; |
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469 } |
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470 |
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471 realdatastart = target_mmap(0, data_len + extra + indx_len, |
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472 PROT_READ|PROT_WRITE|PROT_EXEC, |
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473 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
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474 |
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475 if (realdatastart == -1) { |
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476 fprintf(stderr, "Unable to allocate RAM for process data\n"); |
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477 return realdatastart; |
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478 } |
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479 datapos = realdatastart + indx_len; |
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480 |
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481 DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n", |
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482 (int)(data_len + bss_len + stack_len), (int)datapos); |
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483 |
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484 fpos = ntohl(hdr->data_start); |
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485 #ifdef CONFIG_BINFMT_ZFLAT |
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486 if (flags & FLAT_FLAG_GZDATA) { |
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487 result = decompress_exec(bprm, fpos, (char *) datapos, |
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488 data_len + (relocs * sizeof(abi_ulong))) |
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489 } else |
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490 #endif |
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491 { |
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492 result = target_pread(bprm->fd, datapos, |
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493 data_len + (relocs * sizeof(abi_ulong)), |
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494 fpos); |
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495 } |
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496 if (result < 0) { |
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497 fprintf(stderr, "Unable to read data+bss\n"); |
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498 return result; |
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499 } |
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500 |
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501 reloc = datapos + (ntohl(hdr->reloc_start) - text_len); |
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502 memp = realdatastart; |
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503 |
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504 } else { |
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505 |
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506 textpos = target_mmap(0, text_len + data_len + extra + indx_len, |
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507 PROT_READ | PROT_EXEC | PROT_WRITE, |
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508 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
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509 if (textpos == -1 ) { |
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510 fprintf(stderr, "Unable to allocate RAM for process text/data\n"); |
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511 return -1; |
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512 } |
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513 |
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514 realdatastart = textpos + ntohl(hdr->data_start); |
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515 datapos = realdatastart + indx_len; |
|
516 reloc = (textpos + ntohl(hdr->reloc_start) + indx_len); |
|
517 memp = textpos; |
|
518 |
|
519 #ifdef CONFIG_BINFMT_ZFLAT |
|
520 #error code needs checking |
|
521 /* |
|
522 * load it all in and treat it like a RAM load from now on |
|
523 */ |
|
524 if (flags & FLAT_FLAG_GZIP) { |
|
525 result = decompress_exec(bprm, sizeof (struct flat_hdr), |
|
526 (((char *) textpos) + sizeof (struct flat_hdr)), |
|
527 (text_len + data_len + (relocs * sizeof(unsigned long)) |
|
528 - sizeof (struct flat_hdr)), |
|
529 0); |
|
530 memmove((void *) datapos, (void *) realdatastart, |
|
531 data_len + (relocs * sizeof(unsigned long))); |
|
532 } else if (flags & FLAT_FLAG_GZDATA) { |
|
533 fpos = 0; |
|
534 result = bprm->file->f_op->read(bprm->file, |
|
535 (char *) textpos, text_len, &fpos); |
|
536 if (result < (unsigned long) -4096) |
|
537 result = decompress_exec(bprm, text_len, (char *) datapos, |
|
538 data_len + (relocs * sizeof(unsigned long)), 0); |
|
539 } |
|
540 else |
|
541 #endif |
|
542 { |
|
543 result = target_pread(bprm->fd, textpos, |
|
544 text_len, 0); |
|
545 if (result >= 0) { |
|
546 result = target_pread(bprm->fd, datapos, |
|
547 data_len + (relocs * sizeof(abi_ulong)), |
|
548 ntohl(hdr->data_start)); |
|
549 } |
|
550 } |
|
551 if (result < 0) { |
|
552 fprintf(stderr, "Unable to read code+data+bss\n"); |
|
553 return result; |
|
554 } |
|
555 } |
|
556 |
|
557 DBG_FLT("Mapping is 0x%x, Entry point is 0x%x, data_start is 0x%x\n", |
|
558 (int)textpos, 0x00ffffff&ntohl(hdr->entry), |
|
559 ntohl(hdr->data_start)); |
|
560 |
|
561 /* The main program needs a little extra setup in the task structure */ |
|
562 start_code = textpos + sizeof (struct flat_hdr); |
|
563 end_code = textpos + text_len; |
|
564 |
|
565 DBG_FLT("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n", |
|
566 id ? "Lib" : "Load", bprm->filename, |
|
567 (int) start_code, (int) end_code, |
|
568 (int) datapos, |
|
569 (int) (datapos + data_len), |
|
570 (int) (datapos + data_len), |
|
571 (int) (((datapos + data_len + bss_len) + 3) & ~3)); |
|
572 |
|
573 text_len -= sizeof(struct flat_hdr); /* the real code len */ |
|
574 |
|
575 /* Store the current module values into the global library structure */ |
|
576 libinfo[id].start_code = start_code; |
|
577 libinfo[id].start_data = datapos; |
|
578 libinfo[id].end_data = datapos + data_len; |
|
579 libinfo[id].start_brk = datapos + data_len + bss_len; |
|
580 libinfo[id].text_len = text_len; |
|
581 libinfo[id].loaded = 1; |
|
582 libinfo[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos; |
|
583 libinfo[id].build_date = ntohl(hdr->build_date); |
|
584 |
|
585 /* |
|
586 * We just load the allocations into some temporary memory to |
|
587 * help simplify all this mumbo jumbo |
|
588 * |
|
589 * We've got two different sections of relocation entries. |
|
590 * The first is the GOT which resides at the begining of the data segment |
|
591 * and is terminated with a -1. This one can be relocated in place. |
|
592 * The second is the extra relocation entries tacked after the image's |
|
593 * data segment. These require a little more processing as the entry is |
|
594 * really an offset into the image which contains an offset into the |
|
595 * image. |
|
596 */ |
|
597 if (flags & FLAT_FLAG_GOTPIC) { |
|
598 rp = datapos; |
|
599 while (1) { |
|
600 abi_ulong addr; |
|
601 if (get_user_ual(addr, rp)) |
|
602 return -EFAULT; |
|
603 if (addr == -1) |
|
604 break; |
|
605 if (addr) { |
|
606 addr = calc_reloc(addr, libinfo, id, 0); |
|
607 if (addr == RELOC_FAILED) |
|
608 return -ENOEXEC; |
|
609 if (put_user_ual(addr, rp)) |
|
610 return -EFAULT; |
|
611 } |
|
612 rp += sizeof(abi_ulong); |
|
613 } |
|
614 } |
|
615 |
|
616 /* |
|
617 * Now run through the relocation entries. |
|
618 * We've got to be careful here as C++ produces relocatable zero |
|
619 * entries in the constructor and destructor tables which are then |
|
620 * tested for being not zero (which will always occur unless we're |
|
621 * based from address zero). This causes an endless loop as __start |
|
622 * is at zero. The solution used is to not relocate zero addresses. |
|
623 * This has the negative side effect of not allowing a global data |
|
624 * reference to be statically initialised to _stext (I've moved |
|
625 * __start to address 4 so that is okay). |
|
626 */ |
|
627 if (rev > OLD_FLAT_VERSION) { |
|
628 for (i = 0; i < relocs; i++) { |
|
629 abi_ulong addr, relval; |
|
630 |
|
631 /* Get the address of the pointer to be |
|
632 relocated (of course, the address has to be |
|
633 relocated first). */ |
|
634 if (get_user_ual(relval, reloc + i * sizeof(abi_ulong))) |
|
635 return -EFAULT; |
|
636 addr = flat_get_relocate_addr(relval); |
|
637 rp = calc_reloc(addr, libinfo, id, 1); |
|
638 if (rp == RELOC_FAILED) |
|
639 return -ENOEXEC; |
|
640 |
|
641 /* Get the pointer's value. */ |
|
642 if (get_user_ual(addr, rp)) |
|
643 return -EFAULT; |
|
644 if (addr != 0) { |
|
645 /* |
|
646 * Do the relocation. PIC relocs in the data section are |
|
647 * already in target order |
|
648 */ |
|
649 |
|
650 #ifndef TARGET_WORDS_BIGENDIAN |
|
651 if ((flags & FLAT_FLAG_GOTPIC) == 0) |
|
652 addr = bswap32(addr); |
|
653 #endif |
|
654 addr = calc_reloc(addr, libinfo, id, 0); |
|
655 if (addr == RELOC_FAILED) |
|
656 return -ENOEXEC; |
|
657 |
|
658 /* Write back the relocated pointer. */ |
|
659 if (put_user_ual(addr, rp)) |
|
660 return -EFAULT; |
|
661 } |
|
662 } |
|
663 } else { |
|
664 for (i = 0; i < relocs; i++) { |
|
665 abi_ulong relval; |
|
666 if (get_user_ual(relval, reloc + i * sizeof(abi_ulong))) |
|
667 return -EFAULT; |
|
668 old_reloc(&libinfo[0], relval); |
|
669 } |
|
670 } |
|
671 |
|
672 /* zero the BSS. */ |
|
673 memset((void *)((unsigned long)datapos + data_len), 0, bss_len); |
|
674 |
|
675 return 0; |
|
676 } |
|
677 |
|
678 |
|
679 /****************************************************************************/ |
|
680 #ifdef CONFIG_BINFMT_SHARED_FLAT |
|
681 |
|
682 /* |
|
683 * Load a shared library into memory. The library gets its own data |
|
684 * segment (including bss) but not argv/argc/environ. |
|
685 */ |
|
686 |
|
687 static int load_flat_shared_library(int id, struct lib_info *libs) |
|
688 { |
|
689 struct linux_binprm bprm; |
|
690 int res; |
|
691 char buf[16]; |
|
692 |
|
693 /* Create the file name */ |
|
694 sprintf(buf, "/lib/lib%d.so", id); |
|
695 |
|
696 /* Open the file up */ |
|
697 bprm.filename = buf; |
|
698 bprm.file = open_exec(bprm.filename); |
|
699 res = PTR_ERR(bprm.file); |
|
700 if (IS_ERR(bprm.file)) |
|
701 return res; |
|
702 |
|
703 res = prepare_binprm(&bprm); |
|
704 |
|
705 if (res <= (unsigned long)-4096) |
|
706 res = load_flat_file(&bprm, libs, id, NULL); |
|
707 if (bprm.file) { |
|
708 allow_write_access(bprm.file); |
|
709 fput(bprm.file); |
|
710 bprm.file = NULL; |
|
711 } |
|
712 return(res); |
|
713 } |
|
714 |
|
715 #endif /* CONFIG_BINFMT_SHARED_FLAT */ |
|
716 |
|
717 int load_flt_binary(struct linux_binprm * bprm, struct target_pt_regs * regs, |
|
718 struct image_info * info) |
|
719 { |
|
720 struct lib_info libinfo[MAX_SHARED_LIBS]; |
|
721 abi_ulong p = bprm->p; |
|
722 abi_ulong stack_len; |
|
723 abi_ulong start_addr; |
|
724 abi_ulong sp; |
|
725 int res; |
|
726 int i, j; |
|
727 |
|
728 memset(libinfo, 0, sizeof(libinfo)); |
|
729 /* |
|
730 * We have to add the size of our arguments to our stack size |
|
731 * otherwise it's too easy for users to create stack overflows |
|
732 * by passing in a huge argument list. And yes, we have to be |
|
733 * pedantic and include space for the argv/envp array as it may have |
|
734 * a lot of entries. |
|
735 */ |
|
736 #define TOP_OF_ARGS (TARGET_PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *)) |
|
737 stack_len = TOP_OF_ARGS - bprm->p; /* the strings */ |
|
738 stack_len += (bprm->argc + 1) * 4; /* the argv array */ |
|
739 stack_len += (bprm->envc + 1) * 4; /* the envp array */ |
|
740 |
|
741 |
|
742 res = load_flat_file(bprm, libinfo, 0, &stack_len); |
|
743 if (res > (unsigned long)-4096) |
|
744 return res; |
|
745 |
|
746 /* Update data segment pointers for all libraries */ |
|
747 for (i=0; i<MAX_SHARED_LIBS; i++) { |
|
748 if (libinfo[i].loaded) { |
|
749 abi_ulong p; |
|
750 p = libinfo[i].start_data; |
|
751 for (j=0; j<MAX_SHARED_LIBS; j++) { |
|
752 p -= 4; |
|
753 /* FIXME - handle put_user() failures */ |
|
754 if (put_user_ual(libinfo[j].loaded |
|
755 ? libinfo[j].start_data |
|
756 : UNLOADED_LIB, |
|
757 p)) |
|
758 return -EFAULT; |
|
759 } |
|
760 } |
|
761 } |
|
762 |
|
763 p = ((libinfo[0].start_brk + stack_len + 3) & ~3) - 4; |
|
764 DBG_FLT("p=%x\n", (int)p); |
|
765 |
|
766 /* Copy argv/envp. */ |
|
767 p = copy_strings(p, bprm->envc, bprm->envp); |
|
768 p = copy_strings(p, bprm->argc, bprm->argv); |
|
769 /* Align stack. */ |
|
770 sp = p & ~(abi_ulong)(sizeof(abi_ulong) - 1); |
|
771 /* Enforce final stack alignment of 16 bytes. This is sufficient |
|
772 for all current targets, and excess alignment is harmless. */ |
|
773 stack_len = bprm->envc + bprm->argc + 2; |
|
774 stack_len += 3; /* argc, arvg, argp */ |
|
775 stack_len *= sizeof(abi_ulong); |
|
776 if ((sp + stack_len) & 15) |
|
777 sp -= 16 - ((sp + stack_len) & 15); |
|
778 sp = loader_build_argptr(bprm->envc, bprm->argc, sp, p, 1); |
|
779 |
|
780 /* Fake some return addresses to ensure the call chain will |
|
781 * initialise library in order for us. We are required to call |
|
782 * lib 1 first, then 2, ... and finally the main program (id 0). |
|
783 */ |
|
784 start_addr = libinfo[0].entry; |
|
785 |
|
786 #ifdef CONFIG_BINFMT_SHARED_FLAT |
|
787 #error here |
|
788 for (i = MAX_SHARED_LIBS-1; i>0; i--) { |
|
789 if (libinfo[i].loaded) { |
|
790 /* Push previos first to call address */ |
|
791 --sp; |
|
792 if (put_user_ual(start_addr, sp)) |
|
793 return -EFAULT; |
|
794 start_addr = libinfo[i].entry; |
|
795 } |
|
796 } |
|
797 #endif |
|
798 |
|
799 /* Stash our initial stack pointer into the mm structure */ |
|
800 info->start_code = libinfo[0].start_code; |
|
801 info->end_code = libinfo[0].start_code = libinfo[0].text_len; |
|
802 info->start_data = libinfo[0].start_data; |
|
803 info->end_data = libinfo[0].end_data; |
|
804 info->start_brk = libinfo[0].start_brk; |
|
805 info->start_stack = sp; |
|
806 info->entry = start_addr; |
|
807 info->code_offset = info->start_code; |
|
808 info->data_offset = info->start_data - libinfo[0].text_len; |
|
809 |
|
810 DBG_FLT("start_thread(entry=0x%x, start_stack=0x%x)\n", |
|
811 (int)info->entry, (int)info->start_stack); |
|
812 |
|
813 return 0; |
|
814 } |