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128 .\" ======================================================================== |
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129 .\" |
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130 .IX Title "OBJCOPY 1" |
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131 .TH OBJCOPY 1 "2008-01-09" "binutils-2.18.50" "GNU Development Tools" |
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132 .SH "NAME" |
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133 objcopy \- copy and translate object files |
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134 .SH "SYNOPSIS" |
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135 .IX Header "SYNOPSIS" |
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136 objcopy [\fB\-F\fR \fIbfdname\fR|\fB\-\-target=\fR\fIbfdname\fR] |
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137 [\fB\-I\fR \fIbfdname\fR|\fB\-\-input\-target=\fR\fIbfdname\fR] |
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138 [\fB\-O\fR \fIbfdname\fR|\fB\-\-output\-target=\fR\fIbfdname\fR] |
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139 [\fB\-B\fR \fIbfdarch\fR|\fB\-\-binary\-architecture=\fR\fIbfdarch\fR] |
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140 [\fB\-S\fR|\fB\-\-strip\-all\fR] |
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141 [\fB\-g\fR|\fB\-\-strip\-debug\fR] |
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142 [\fB\-K\fR \fIsymbolname\fR|\fB\-\-keep\-symbol=\fR\fIsymbolname\fR] |
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143 [\fB\-N\fR \fIsymbolname\fR|\fB\-\-strip\-symbol=\fR\fIsymbolname\fR] |
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144 [\fB\-\-strip\-unneeded\-symbol=\fR\fIsymbolname\fR] |
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145 [\fB\-G\fR \fIsymbolname\fR|\fB\-\-keep\-global\-symbol=\fR\fIsymbolname\fR] |
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146 [\fB\-\-localize\-hidden\fR] |
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147 [\fB\-L\fR \fIsymbolname\fR|\fB\-\-localize\-symbol=\fR\fIsymbolname\fR] |
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148 [\fB\-\-globalize\-symbol=\fR\fIsymbolname\fR] |
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149 [\fB\-W\fR \fIsymbolname\fR|\fB\-\-weaken\-symbol=\fR\fIsymbolname\fR] |
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150 [\fB\-w\fR|\fB\-\-wildcard\fR] |
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151 [\fB\-x\fR|\fB\-\-discard\-all\fR] |
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152 [\fB\-X\fR|\fB\-\-discard\-locals\fR] |
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153 [\fB\-b\fR \fIbyte\fR|\fB\-\-byte=\fR\fIbyte\fR] |
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154 [\fB\-i\fR \fIinterleave\fR|\fB\-\-interleave=\fR\fIinterleave\fR] |
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155 [\fB\-j\fR \fIsectionname\fR|\fB\-\-only\-section=\fR\fIsectionname\fR] |
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156 [\fB\-R\fR \fIsectionname\fR|\fB\-\-remove\-section=\fR\fIsectionname\fR] |
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157 [\fB\-p\fR|\fB\-\-preserve\-dates\fR] |
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158 [\fB\-\-debugging\fR] |
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159 [\fB\-\-gap\-fill=\fR\fIval\fR] |
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160 [\fB\-\-pad\-to=\fR\fIaddress\fR] |
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161 [\fB\-\-set\-start=\fR\fIval\fR] |
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162 [\fB\-\-adjust\-start=\fR\fIincr\fR] |
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163 [\fB\-\-change\-addresses=\fR\fIincr\fR] |
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164 [\fB\-\-change\-section\-address\fR \fIsection\fR{=,+,\-}\fIval\fR] |
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165 [\fB\-\-change\-section\-lma\fR \fIsection\fR{=,+,\-}\fIval\fR] |
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166 [\fB\-\-change\-section\-vma\fR \fIsection\fR{=,+,\-}\fIval\fR] |
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167 [\fB\-\-change\-warnings\fR] [\fB\-\-no\-change\-warnings\fR] |
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168 [\fB\-\-set\-section\-flags\fR \fIsection\fR=\fIflags\fR] |
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169 [\fB\-\-add\-section\fR \fIsectionname\fR=\fIfilename\fR] |
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170 [\fB\-\-rename\-section\fR \fIoldname\fR=\fInewname\fR[,\fIflags\fR]] |
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171 [\fB\-\-change\-leading\-char\fR] [\fB\-\-remove\-leading\-char\fR] |
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172 [\fB\-\-reverse\-bytes=\fR\fInum\fR] |
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173 [\fB\-\-srec\-len=\fR\fIival\fR] [\fB\-\-srec\-forceS3\fR] |
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174 [\fB\-\-redefine\-sym\fR \fIold\fR=\fInew\fR] |
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175 [\fB\-\-redefine\-syms=\fR\fIfilename\fR] |
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176 [\fB\-\-weaken\fR] |
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177 [\fB\-\-keep\-symbols=\fR\fIfilename\fR] |
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178 [\fB\-\-strip\-symbols=\fR\fIfilename\fR] |
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179 [\fB\-\-strip\-unneeded\-symbols=\fR\fIfilename\fR] |
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180 [\fB\-\-keep\-global\-symbols=\fR\fIfilename\fR] |
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181 [\fB\-\-localize\-symbols=\fR\fIfilename\fR] |
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182 [\fB\-\-globalize\-symbols=\fR\fIfilename\fR] |
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183 [\fB\-\-weaken\-symbols=\fR\fIfilename\fR] |
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184 [\fB\-\-alt\-machine\-code=\fR\fIindex\fR] |
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185 [\fB\-\-prefix\-symbols=\fR\fIstring\fR] |
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186 [\fB\-\-prefix\-sections=\fR\fIstring\fR] |
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187 [\fB\-\-prefix\-alloc\-sections=\fR\fIstring\fR] |
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188 [\fB\-\-add\-gnu\-debuglink=\fR\fIpath-to-file\fR] |
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189 [\fB\-\-keep\-file\-symbols\fR] |
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190 [\fB\-\-only\-keep\-debug\fR] |
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191 [\fB\-\-extract\-symbol\fR] |
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192 [\fB\-\-writable\-text\fR] |
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193 [\fB\-\-readonly\-text\fR] |
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194 [\fB\-\-pure\fR] |
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195 [\fB\-\-impure\fR] |
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196 [\fB\-v\fR|\fB\-\-verbose\fR] |
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197 [\fB\-V\fR|\fB\-\-version\fR] |
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198 [\fB\-\-help\fR] [\fB\-\-info\fR] |
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199 \fIinfile\fR [\fIoutfile\fR] |
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200 .SH "DESCRIPTION" |
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201 .IX Header "DESCRIPTION" |
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202 The \s-1GNU\s0 \fBobjcopy\fR utility copies the contents of an object |
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203 file to another. \fBobjcopy\fR uses the \s-1GNU\s0 \s-1BFD\s0 Library to |
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204 read and write the object files. It can write the destination object |
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205 file in a format different from that of the source object file. The |
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206 exact behavior of \fBobjcopy\fR is controlled by command-line options. |
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207 Note that \fBobjcopy\fR should be able to copy a fully linked file |
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208 between any two formats. However, copying a relocatable object file |
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209 between any two formats may not work as expected. |
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210 .PP |
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211 \&\fBobjcopy\fR creates temporary files to do its translations and |
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212 deletes them afterward. \fBobjcopy\fR uses \s-1BFD\s0 to do all its |
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213 translation work; it has access to all the formats described in \s-1BFD\s0 |
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214 and thus is able to recognize most formats without being told |
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215 explicitly. |
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216 .PP |
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217 \&\fBobjcopy\fR can be used to generate S\-records by using an output |
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218 target of \fBsrec\fR (e.g., use \fB\-O srec\fR). |
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219 .PP |
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220 \&\fBobjcopy\fR can be used to generate a raw binary file by using an |
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221 output target of \fBbinary\fR (e.g., use \fB\-O binary\fR). When |
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222 \&\fBobjcopy\fR generates a raw binary file, it will essentially produce |
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223 a memory dump of the contents of the input object file. All symbols and |
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224 relocation information will be discarded. The memory dump will start at |
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225 the load address of the lowest section copied into the output file. |
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226 .PP |
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227 When generating an S\-record or a raw binary file, it may be helpful to |
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228 use \fB\-S\fR to remove sections containing debugging information. In |
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229 some cases \fB\-R\fR will be useful to remove sections which contain |
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230 information that is not needed by the binary file. |
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231 .PP |
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232 Note\-\-\-\fBobjcopy\fR is not able to change the endianness of its input |
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233 files. If the input format has an endianness (some formats do not), |
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234 \&\fBobjcopy\fR can only copy the inputs into file formats that have the |
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235 same endianness or which have no endianness (e.g., \fBsrec\fR). |
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236 (However, see the \fB\-\-reverse\-bytes\fR option.) |
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237 .SH "OPTIONS" |
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238 .IX Header "OPTIONS" |
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239 .IP "\fIinfile\fR" 4 |
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240 .IX Item "infile" |
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241 .PD 0 |
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242 .IP "\fIoutfile\fR" 4 |
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243 .IX Item "outfile" |
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244 .PD |
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245 The input and output files, respectively. |
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246 If you do not specify \fIoutfile\fR, \fBobjcopy\fR creates a |
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247 temporary file and destructively renames the result with |
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248 the name of \fIinfile\fR. |
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249 .IP "\fB\-I\fR \fIbfdname\fR" 4 |
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250 .IX Item "-I bfdname" |
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251 .PD 0 |
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252 .IP "\fB\-\-input\-target=\fR\fIbfdname\fR" 4 |
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253 .IX Item "--input-target=bfdname" |
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254 .PD |
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255 Consider the source file's object format to be \fIbfdname\fR, rather than |
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256 attempting to deduce it. |
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257 .IP "\fB\-O\fR \fIbfdname\fR" 4 |
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258 .IX Item "-O bfdname" |
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259 .PD 0 |
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260 .IP "\fB\-\-output\-target=\fR\fIbfdname\fR" 4 |
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261 .IX Item "--output-target=bfdname" |
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262 .PD |
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263 Write the output file using the object format \fIbfdname\fR. |
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264 .IP "\fB\-F\fR \fIbfdname\fR" 4 |
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265 .IX Item "-F bfdname" |
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266 .PD 0 |
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267 .IP "\fB\-\-target=\fR\fIbfdname\fR" 4 |
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268 .IX Item "--target=bfdname" |
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269 .PD |
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270 Use \fIbfdname\fR as the object format for both the input and the output |
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271 file; i.e., simply transfer data from source to destination with no |
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272 translation. |
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273 .IP "\fB\-B\fR \fIbfdarch\fR" 4 |
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274 .IX Item "-B bfdarch" |
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275 .PD 0 |
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276 .IP "\fB\-\-binary\-architecture=\fR\fIbfdarch\fR" 4 |
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277 .IX Item "--binary-architecture=bfdarch" |
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278 .PD |
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279 Useful when transforming a raw binary input file into an object file. |
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280 In this case the output architecture can be set to \fIbfdarch\fR. This |
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281 option will be ignored if the input file has a known \fIbfdarch\fR. You |
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282 can access this binary data inside a program by referencing the special |
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283 symbols that are created by the conversion process. These symbols are |
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284 called _binary_\fIobjfile\fR_start, _binary_\fIobjfile\fR_end and |
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285 _binary_\fIobjfile\fR_size. e.g. you can transform a picture file into |
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286 an object file and then access it in your code using these symbols. |
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287 .IP "\fB\-j\fR \fIsectionname\fR" 4 |
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288 .IX Item "-j sectionname" |
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289 .PD 0 |
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290 .IP "\fB\-\-only\-section=\fR\fIsectionname\fR" 4 |
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291 .IX Item "--only-section=sectionname" |
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292 .PD |
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293 Copy only the named section from the input file to the output file. |
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294 This option may be given more than once. Note that using this option |
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295 inappropriately may make the output file unusable. |
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296 .IP "\fB\-R\fR \fIsectionname\fR" 4 |
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297 .IX Item "-R sectionname" |
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298 .PD 0 |
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299 .IP "\fB\-\-remove\-section=\fR\fIsectionname\fR" 4 |
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300 .IX Item "--remove-section=sectionname" |
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301 .PD |
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302 Remove any section named \fIsectionname\fR from the output file. This |
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303 option may be given more than once. Note that using this option |
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304 inappropriately may make the output file unusable. |
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305 .IP "\fB\-S\fR" 4 |
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306 .IX Item "-S" |
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307 .PD 0 |
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308 .IP "\fB\-\-strip\-all\fR" 4 |
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309 .IX Item "--strip-all" |
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310 .PD |
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311 Do not copy relocation and symbol information from the source file. |
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312 .IP "\fB\-g\fR" 4 |
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313 .IX Item "-g" |
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314 .PD 0 |
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315 .IP "\fB\-\-strip\-debug\fR" 4 |
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316 .IX Item "--strip-debug" |
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317 .PD |
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318 Do not copy debugging symbols or sections from the source file. |
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319 .IP "\fB\-\-strip\-unneeded\fR" 4 |
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320 .IX Item "--strip-unneeded" |
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321 Strip all symbols that are not needed for relocation processing. |
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322 .IP "\fB\-K\fR \fIsymbolname\fR" 4 |
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323 .IX Item "-K symbolname" |
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324 .PD 0 |
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325 .IP "\fB\-\-keep\-symbol=\fR\fIsymbolname\fR" 4 |
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326 .IX Item "--keep-symbol=symbolname" |
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327 .PD |
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328 When stripping symbols, keep symbol \fIsymbolname\fR even if it would |
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329 normally be stripped. This option may be given more than once. |
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330 .IP "\fB\-N\fR \fIsymbolname\fR" 4 |
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331 .IX Item "-N symbolname" |
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332 .PD 0 |
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333 .IP "\fB\-\-strip\-symbol=\fR\fIsymbolname\fR" 4 |
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334 .IX Item "--strip-symbol=symbolname" |
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335 .PD |
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336 Do not copy symbol \fIsymbolname\fR from the source file. This option |
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337 may be given more than once. |
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338 .IP "\fB\-\-strip\-unneeded\-symbol=\fR\fIsymbolname\fR" 4 |
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339 .IX Item "--strip-unneeded-symbol=symbolname" |
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340 Do not copy symbol \fIsymbolname\fR from the source file unless it is needed |
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341 by a relocation. This option may be given more than once. |
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342 .IP "\fB\-G\fR \fIsymbolname\fR" 4 |
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343 .IX Item "-G symbolname" |
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344 .PD 0 |
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345 .IP "\fB\-\-keep\-global\-symbol=\fR\fIsymbolname\fR" 4 |
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346 .IX Item "--keep-global-symbol=symbolname" |
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347 .PD |
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348 Keep only symbol \fIsymbolname\fR global. Make all other symbols local |
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349 to the file, so that they are not visible externally. This option may |
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350 be given more than once. |
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351 .IP "\fB\-\-localize\-hidden\fR" 4 |
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352 .IX Item "--localize-hidden" |
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353 In an \s-1ELF\s0 object, mark all symbols that have hidden or internal visibility |
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354 as local. This option applies on top of symbol-specific localization options |
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355 such as \fB\-L\fR. |
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356 .IP "\fB\-L\fR \fIsymbolname\fR" 4 |
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357 .IX Item "-L symbolname" |
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358 .PD 0 |
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359 .IP "\fB\-\-localize\-symbol=\fR\fIsymbolname\fR" 4 |
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360 .IX Item "--localize-symbol=symbolname" |
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361 .PD |
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362 Make symbol \fIsymbolname\fR local to the file, so that it is not |
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363 visible externally. This option may be given more than once. |
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364 .IP "\fB\-W\fR \fIsymbolname\fR" 4 |
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365 .IX Item "-W symbolname" |
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366 .PD 0 |
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367 .IP "\fB\-\-weaken\-symbol=\fR\fIsymbolname\fR" 4 |
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368 .IX Item "--weaken-symbol=symbolname" |
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369 .PD |
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370 Make symbol \fIsymbolname\fR weak. This option may be given more than once. |
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371 .IP "\fB\-\-globalize\-symbol=\fR\fIsymbolname\fR" 4 |
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372 .IX Item "--globalize-symbol=symbolname" |
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373 Give symbol \fIsymbolname\fR global scoping so that it is visible |
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374 outside of the file in which it is defined. This option may be given |
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375 more than once. |
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376 .IP "\fB\-w\fR" 4 |
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377 .IX Item "-w" |
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378 .PD 0 |
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379 .IP "\fB\-\-wildcard\fR" 4 |
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380 .IX Item "--wildcard" |
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381 .PD |
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382 Permit regular expressions in \fIsymbolname\fRs used in other command |
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383 line options. The question mark (?), asterisk (*), backslash (\e) and |
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384 square brackets ([]) operators can be used anywhere in the symbol |
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385 name. If the first character of the symbol name is the exclamation |
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386 point (!) then the sense of the switch is reversed for that symbol. |
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387 For example: |
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388 .Sp |
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389 .Vb 1 |
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390 \& -w -W !foo -W fo* |
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391 .Ve |
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392 .Sp |
|
393 would cause objcopy to weaken all symbols that start with \*(L"fo\*(R" |
|
394 except for the symbol \*(L"foo\*(R". |
|
395 .IP "\fB\-x\fR" 4 |
|
396 .IX Item "-x" |
|
397 .PD 0 |
|
398 .IP "\fB\-\-discard\-all\fR" 4 |
|
399 .IX Item "--discard-all" |
|
400 .PD |
|
401 Do not copy non-global symbols from the source file. |
|
402 .IP "\fB\-X\fR" 4 |
|
403 .IX Item "-X" |
|
404 .PD 0 |
|
405 .IP "\fB\-\-discard\-locals\fR" 4 |
|
406 .IX Item "--discard-locals" |
|
407 .PD |
|
408 Do not copy compiler-generated local symbols. |
|
409 (These usually start with \fBL\fR or \fB.\fR.) |
|
410 .IP "\fB\-b\fR \fIbyte\fR" 4 |
|
411 .IX Item "-b byte" |
|
412 .PD 0 |
|
413 .IP "\fB\-\-byte=\fR\fIbyte\fR" 4 |
|
414 .IX Item "--byte=byte" |
|
415 .PD |
|
416 Keep only every \fIbyte\fRth byte of the input file (header data is not |
|
417 affected). \fIbyte\fR can be in the range from 0 to \fIinterleave\fR\-1, |
|
418 where \fIinterleave\fR is given by the \fB\-i\fR or \fB\-\-interleave\fR |
|
419 option, or the default of 4. This option is useful for creating files |
|
420 to program \s-1ROM\s0. It is typically used with an \f(CW\*(C`srec\*(C'\fR output |
|
421 target. |
|
422 .IP "\fB\-i\fR \fIinterleave\fR" 4 |
|
423 .IX Item "-i interleave" |
|
424 .PD 0 |
|
425 .IP "\fB\-\-interleave=\fR\fIinterleave\fR" 4 |
|
426 .IX Item "--interleave=interleave" |
|
427 .PD |
|
428 Only copy one out of every \fIinterleave\fR bytes. Select which byte to |
|
429 copy with the \fB\-b\fR or \fB\-\-byte\fR option. The default is 4. |
|
430 \&\fBobjcopy\fR ignores this option if you do not specify either \fB\-b\fR or |
|
431 \&\fB\-\-byte\fR. |
|
432 .IP "\fB\-p\fR" 4 |
|
433 .IX Item "-p" |
|
434 .PD 0 |
|
435 .IP "\fB\-\-preserve\-dates\fR" 4 |
|
436 .IX Item "--preserve-dates" |
|
437 .PD |
|
438 Set the access and modification dates of the output file to be the same |
|
439 as those of the input file. |
|
440 .IP "\fB\-\-debugging\fR" 4 |
|
441 .IX Item "--debugging" |
|
442 Convert debugging information, if possible. This is not the default |
|
443 because only certain debugging formats are supported, and the |
|
444 conversion process can be time consuming. |
|
445 .IP "\fB\-\-gap\-fill\fR \fIval\fR" 4 |
|
446 .IX Item "--gap-fill val" |
|
447 Fill gaps between sections with \fIval\fR. This operation applies to |
|
448 the \fIload address\fR (\s-1LMA\s0) of the sections. It is done by increasing |
|
449 the size of the section with the lower address, and filling in the extra |
|
450 space created with \fIval\fR. |
|
451 .IP "\fB\-\-pad\-to\fR \fIaddress\fR" 4 |
|
452 .IX Item "--pad-to address" |
|
453 Pad the output file up to the load address \fIaddress\fR. This is |
|
454 done by increasing the size of the last section. The extra space is |
|
455 filled in with the value specified by \fB\-\-gap\-fill\fR (default zero). |
|
456 .IP "\fB\-\-set\-start\fR \fIval\fR" 4 |
|
457 .IX Item "--set-start val" |
|
458 Set the start address of the new file to \fIval\fR. Not all object file |
|
459 formats support setting the start address. |
|
460 .IP "\fB\-\-change\-start\fR \fIincr\fR" 4 |
|
461 .IX Item "--change-start incr" |
|
462 .PD 0 |
|
463 .IP "\fB\-\-adjust\-start\fR \fIincr\fR" 4 |
|
464 .IX Item "--adjust-start incr" |
|
465 .PD |
|
466 Change the start address by adding \fIincr\fR. Not all object file |
|
467 formats support setting the start address. |
|
468 .IP "\fB\-\-change\-addresses\fR \fIincr\fR" 4 |
|
469 .IX Item "--change-addresses incr" |
|
470 .PD 0 |
|
471 .IP "\fB\-\-adjust\-vma\fR \fIincr\fR" 4 |
|
472 .IX Item "--adjust-vma incr" |
|
473 .PD |
|
474 Change the \s-1VMA\s0 and \s-1LMA\s0 addresses of all sections, as well as the start |
|
475 address, by adding \fIincr\fR. Some object file formats do not permit |
|
476 section addresses to be changed arbitrarily. Note that this does not |
|
477 relocate the sections; if the program expects sections to be loaded at a |
|
478 certain address, and this option is used to change the sections such |
|
479 that they are loaded at a different address, the program may fail. |
|
480 .IP "\fB\-\-change\-section\-address\fR \fIsection\fR\fB{=,+,\-}\fR\fIval\fR" 4 |
|
481 .IX Item "--change-section-address section{=,+,-}val" |
|
482 .PD 0 |
|
483 .IP "\fB\-\-adjust\-section\-vma\fR \fIsection\fR\fB{=,+,\-}\fR\fIval\fR" 4 |
|
484 .IX Item "--adjust-section-vma section{=,+,-}val" |
|
485 .PD |
|
486 Set or change both the \s-1VMA\s0 address and the \s-1LMA\s0 address of the named |
|
487 \&\fIsection\fR. If \fB=\fR is used, the section address is set to |
|
488 \&\fIval\fR. Otherwise, \fIval\fR is added to or subtracted from the |
|
489 section address. See the comments under \fB\-\-change\-addresses\fR, |
|
490 above. If \fIsection\fR does not exist in the input file, a warning will |
|
491 be issued, unless \fB\-\-no\-change\-warnings\fR is used. |
|
492 .IP "\fB\-\-change\-section\-lma\fR \fIsection\fR\fB{=,+,\-}\fR\fIval\fR" 4 |
|
493 .IX Item "--change-section-lma section{=,+,-}val" |
|
494 Set or change the \s-1LMA\s0 address of the named \fIsection\fR. The \s-1LMA\s0 |
|
495 address is the address where the section will be loaded into memory at |
|
496 program load time. Normally this is the same as the \s-1VMA\s0 address, which |
|
497 is the address of the section at program run time, but on some systems, |
|
498 especially those where a program is held in \s-1ROM\s0, the two can be |
|
499 different. If \fB=\fR is used, the section address is set to |
|
500 \&\fIval\fR. Otherwise, \fIval\fR is added to or subtracted from the |
|
501 section address. See the comments under \fB\-\-change\-addresses\fR, |
|
502 above. If \fIsection\fR does not exist in the input file, a warning |
|
503 will be issued, unless \fB\-\-no\-change\-warnings\fR is used. |
|
504 .IP "\fB\-\-change\-section\-vma\fR \fIsection\fR\fB{=,+,\-}\fR\fIval\fR" 4 |
|
505 .IX Item "--change-section-vma section{=,+,-}val" |
|
506 Set or change the \s-1VMA\s0 address of the named \fIsection\fR. The \s-1VMA\s0 |
|
507 address is the address where the section will be located once the |
|
508 program has started executing. Normally this is the same as the \s-1LMA\s0 |
|
509 address, which is the address where the section will be loaded into |
|
510 memory, but on some systems, especially those where a program is held in |
|
511 \&\s-1ROM\s0, the two can be different. If \fB=\fR is used, the section address |
|
512 is set to \fIval\fR. Otherwise, \fIval\fR is added to or subtracted |
|
513 from the section address. See the comments under |
|
514 \&\fB\-\-change\-addresses\fR, above. If \fIsection\fR does not exist in |
|
515 the input file, a warning will be issued, unless |
|
516 \&\fB\-\-no\-change\-warnings\fR is used. |
|
517 .IP "\fB\-\-change\-warnings\fR" 4 |
|
518 .IX Item "--change-warnings" |
|
519 .PD 0 |
|
520 .IP "\fB\-\-adjust\-warnings\fR" 4 |
|
521 .IX Item "--adjust-warnings" |
|
522 .PD |
|
523 If \fB\-\-change\-section\-address\fR or \fB\-\-change\-section\-lma\fR or |
|
524 \&\fB\-\-change\-section\-vma\fR is used, and the named section does not |
|
525 exist, issue a warning. This is the default. |
|
526 .IP "\fB\-\-no\-change\-warnings\fR" 4 |
|
527 .IX Item "--no-change-warnings" |
|
528 .PD 0 |
|
529 .IP "\fB\-\-no\-adjust\-warnings\fR" 4 |
|
530 .IX Item "--no-adjust-warnings" |
|
531 .PD |
|
532 Do not issue a warning if \fB\-\-change\-section\-address\fR or |
|
533 \&\fB\-\-adjust\-section\-lma\fR or \fB\-\-adjust\-section\-vma\fR is used, even |
|
534 if the named section does not exist. |
|
535 .IP "\fB\-\-set\-section\-flags\fR \fIsection\fR\fB=\fR\fIflags\fR" 4 |
|
536 .IX Item "--set-section-flags section=flags" |
|
537 Set the flags for the named section. The \fIflags\fR argument is a |
|
538 comma separated string of flag names. The recognized names are |
|
539 \&\fBalloc\fR, \fBcontents\fR, \fBload\fR, \fBnoload\fR, |
|
540 \&\fBreadonly\fR, \fBcode\fR, \fBdata\fR, \fBrom\fR, \fBshare\fR, and |
|
541 \&\fBdebug\fR. You can set the \fBcontents\fR flag for a section which |
|
542 does not have contents, but it is not meaningful to clear the |
|
543 \&\fBcontents\fR flag of a section which does have contents\*(--just remove |
|
544 the section instead. Not all flags are meaningful for all object file |
|
545 formats. |
|
546 .IP "\fB\-\-add\-section\fR \fIsectionname\fR\fB=\fR\fIfilename\fR" 4 |
|
547 .IX Item "--add-section sectionname=filename" |
|
548 Add a new section named \fIsectionname\fR while copying the file. The |
|
549 contents of the new section are taken from the file \fIfilename\fR. The |
|
550 size of the section will be the size of the file. This option only |
|
551 works on file formats which can support sections with arbitrary names. |
|
552 .IP "\fB\-\-rename\-section\fR \fIoldname\fR\fB=\fR\fInewname\fR\fB[,\fR\fIflags\fR\fB]\fR" 4 |
|
553 .IX Item "--rename-section oldname=newname[,flags]" |
|
554 Rename a section from \fIoldname\fR to \fInewname\fR, optionally |
|
555 changing the section's flags to \fIflags\fR in the process. This has |
|
556 the advantage over usng a linker script to perform the rename in that |
|
557 the output stays as an object file and does not become a linked |
|
558 executable. |
|
559 .Sp |
|
560 This option is particularly helpful when the input format is binary, |
|
561 since this will always create a section called .data. If for example, |
|
562 you wanted instead to create a section called .rodata containing binary |
|
563 data you could use the following command line to achieve it: |
|
564 .Sp |
|
565 .Vb 3 |
|
566 \& objcopy -I binary -O <output_format> -B <architecture> \e |
|
567 \& --rename-section .data=.rodata,alloc,load,readonly,data,contents \e |
|
568 \& <input_binary_file> <output_object_file> |
|
569 .Ve |
|
570 .IP "\fB\-\-change\-leading\-char\fR" 4 |
|
571 .IX Item "--change-leading-char" |
|
572 Some object file formats use special characters at the start of |
|
573 symbols. The most common such character is underscore, which compilers |
|
574 often add before every symbol. This option tells \fBobjcopy\fR to |
|
575 change the leading character of every symbol when it converts between |
|
576 object file formats. If the object file formats use the same leading |
|
577 character, this option has no effect. Otherwise, it will add a |
|
578 character, or remove a character, or change a character, as |
|
579 appropriate. |
|
580 .IP "\fB\-\-remove\-leading\-char\fR" 4 |
|
581 .IX Item "--remove-leading-char" |
|
582 If the first character of a global symbol is a special symbol leading |
|
583 character used by the object file format, remove the character. The |
|
584 most common symbol leading character is underscore. This option will |
|
585 remove a leading underscore from all global symbols. This can be useful |
|
586 if you want to link together objects of different file formats with |
|
587 different conventions for symbol names. This is different from |
|
588 \&\fB\-\-change\-leading\-char\fR because it always changes the symbol name |
|
589 when appropriate, regardless of the object file format of the output |
|
590 file. |
|
591 .IP "\fB\-\-reverse\-bytes=\fR\fInum\fR" 4 |
|
592 .IX Item "--reverse-bytes=num" |
|
593 Reverse the bytes in a section with output contents. A section length must |
|
594 be evenly divisible by the value given in order for the swap to be able to |
|
595 take place. Reversing takes place before the interleaving is performed. |
|
596 .Sp |
|
597 This option is used typically in generating \s-1ROM\s0 images for problematic |
|
598 target systems. For example, on some target boards, the 32\-bit words |
|
599 fetched from 8\-bit ROMs are re-assembled in little-endian byte order |
|
600 regardless of the \s-1CPU\s0 byte order. Depending on the programming model, the |
|
601 endianness of the \s-1ROM\s0 may need to be modified. |
|
602 .Sp |
|
603 Consider a simple file with a section containing the following eight |
|
604 bytes: \f(CW12345678\fR. |
|
605 .Sp |
|
606 Using \fB\-\-reverse\-bytes=2\fR for the above example, the bytes in the |
|
607 output file would be ordered \f(CW21436587\fR. |
|
608 .Sp |
|
609 Using \fB\-\-reverse\-bytes=4\fR for the above example, the bytes in the |
|
610 output file would be ordered \f(CW43218765\fR. |
|
611 .Sp |
|
612 By using \fB\-\-reverse\-bytes=2\fR for the above example, followed by |
|
613 \&\fB\-\-reverse\-bytes=4\fR on the output file, the bytes in the second |
|
614 output file would be ordered \f(CW34127856\fR. |
|
615 .IP "\fB\-\-srec\-len=\fR\fIival\fR" 4 |
|
616 .IX Item "--srec-len=ival" |
|
617 Meaningful only for srec output. Set the maximum length of the Srecords |
|
618 being produced to \fIival\fR. This length covers both address, data and |
|
619 crc fields. |
|
620 .IP "\fB\-\-srec\-forceS3\fR" 4 |
|
621 .IX Item "--srec-forceS3" |
|
622 Meaningful only for srec output. Avoid generation of S1/S2 records, |
|
623 creating S3\-only record format. |
|
624 .IP "\fB\-\-redefine\-sym\fR \fIold\fR\fB=\fR\fInew\fR" 4 |
|
625 .IX Item "--redefine-sym old=new" |
|
626 Change the name of a symbol \fIold\fR, to \fInew\fR. This can be useful |
|
627 when one is trying link two things together for which you have no |
|
628 source, and there are name collisions. |
|
629 .IP "\fB\-\-redefine\-syms=\fR\fIfilename\fR" 4 |
|
630 .IX Item "--redefine-syms=filename" |
|
631 Apply \fB\-\-redefine\-sym\fR to each symbol pair "\fIold\fR \fInew\fR" |
|
632 listed in the file \fIfilename\fR. \fIfilename\fR is simply a flat file, |
|
633 with one symbol pair per line. Line comments may be introduced by the hash |
|
634 character. This option may be given more than once. |
|
635 .IP "\fB\-\-weaken\fR" 4 |
|
636 .IX Item "--weaken" |
|
637 Change all global symbols in the file to be weak. This can be useful |
|
638 when building an object which will be linked against other objects using |
|
639 the \fB\-R\fR option to the linker. This option is only effective when |
|
640 using an object file format which supports weak symbols. |
|
641 .IP "\fB\-\-keep\-symbols=\fR\fIfilename\fR" 4 |
|
642 .IX Item "--keep-symbols=filename" |
|
643 Apply \fB\-\-keep\-symbol\fR option to each symbol listed in the file |
|
644 \&\fIfilename\fR. \fIfilename\fR is simply a flat file, with one symbol |
|
645 name per line. Line comments may be introduced by the hash character. |
|
646 This option may be given more than once. |
|
647 .IP "\fB\-\-strip\-symbols=\fR\fIfilename\fR" 4 |
|
648 .IX Item "--strip-symbols=filename" |
|
649 Apply \fB\-\-strip\-symbol\fR option to each symbol listed in the file |
|
650 \&\fIfilename\fR. \fIfilename\fR is simply a flat file, with one symbol |
|
651 name per line. Line comments may be introduced by the hash character. |
|
652 This option may be given more than once. |
|
653 .IP "\fB\-\-strip\-unneeded\-symbols=\fR\fIfilename\fR" 4 |
|
654 .IX Item "--strip-unneeded-symbols=filename" |
|
655 Apply \fB\-\-strip\-unneeded\-symbol\fR option to each symbol listed in |
|
656 the file \fIfilename\fR. \fIfilename\fR is simply a flat file, with one |
|
657 symbol name per line. Line comments may be introduced by the hash |
|
658 character. This option may be given more than once. |
|
659 .IP "\fB\-\-keep\-global\-symbols=\fR\fIfilename\fR" 4 |
|
660 .IX Item "--keep-global-symbols=filename" |
|
661 Apply \fB\-\-keep\-global\-symbol\fR option to each symbol listed in the |
|
662 file \fIfilename\fR. \fIfilename\fR is simply a flat file, with one |
|
663 symbol name per line. Line comments may be introduced by the hash |
|
664 character. This option may be given more than once. |
|
665 .IP "\fB\-\-localize\-symbols=\fR\fIfilename\fR" 4 |
|
666 .IX Item "--localize-symbols=filename" |
|
667 Apply \fB\-\-localize\-symbol\fR option to each symbol listed in the file |
|
668 \&\fIfilename\fR. \fIfilename\fR is simply a flat file, with one symbol |
|
669 name per line. Line comments may be introduced by the hash character. |
|
670 This option may be given more than once. |
|
671 .IP "\fB\-\-globalize\-symbols=\fR\fIfilename\fR" 4 |
|
672 .IX Item "--globalize-symbols=filename" |
|
673 Apply \fB\-\-globalize\-symbol\fR option to each symbol listed in the file |
|
674 \&\fIfilename\fR. \fIfilename\fR is simply a flat file, with one symbol |
|
675 name per line. Line comments may be introduced by the hash character. |
|
676 This option may be given more than once. |
|
677 .IP "\fB\-\-weaken\-symbols=\fR\fIfilename\fR" 4 |
|
678 .IX Item "--weaken-symbols=filename" |
|
679 Apply \fB\-\-weaken\-symbol\fR option to each symbol listed in the file |
|
680 \&\fIfilename\fR. \fIfilename\fR is simply a flat file, with one symbol |
|
681 name per line. Line comments may be introduced by the hash character. |
|
682 This option may be given more than once. |
|
683 .IP "\fB\-\-alt\-machine\-code=\fR\fIindex\fR" 4 |
|
684 .IX Item "--alt-machine-code=index" |
|
685 If the output architecture has alternate machine codes, use the |
|
686 \&\fIindex\fRth code instead of the default one. This is useful in case |
|
687 a machine is assigned an official code and the tool-chain adopts the |
|
688 new code, but other applications still depend on the original code |
|
689 being used. For \s-1ELF\s0 based architectures if the \fIindex\fR |
|
690 alternative does not exist then the value is treated as an absolute |
|
691 number to be stored in the e_machine field of the \s-1ELF\s0 header. |
|
692 .IP "\fB\-\-writable\-text\fR" 4 |
|
693 .IX Item "--writable-text" |
|
694 Mark the output text as writable. This option isn't meaningful for all |
|
695 object file formats. |
|
696 .IP "\fB\-\-readonly\-text\fR" 4 |
|
697 .IX Item "--readonly-text" |
|
698 Make the output text write protected. This option isn't meaningful for all |
|
699 object file formats. |
|
700 .IP "\fB\-\-pure\fR" 4 |
|
701 .IX Item "--pure" |
|
702 Mark the output file as demand paged. This option isn't meaningful for all |
|
703 object file formats. |
|
704 .IP "\fB\-\-impure\fR" 4 |
|
705 .IX Item "--impure" |
|
706 Mark the output file as impure. This option isn't meaningful for all |
|
707 object file formats. |
|
708 .IP "\fB\-\-prefix\-symbols=\fR\fIstring\fR" 4 |
|
709 .IX Item "--prefix-symbols=string" |
|
710 Prefix all symbols in the output file with \fIstring\fR. |
|
711 .IP "\fB\-\-prefix\-sections=\fR\fIstring\fR" 4 |
|
712 .IX Item "--prefix-sections=string" |
|
713 Prefix all section names in the output file with \fIstring\fR. |
|
714 .IP "\fB\-\-prefix\-alloc\-sections=\fR\fIstring\fR" 4 |
|
715 .IX Item "--prefix-alloc-sections=string" |
|
716 Prefix all the names of all allocated sections in the output file with |
|
717 \&\fIstring\fR. |
|
718 .IP "\fB\-\-add\-gnu\-debuglink=\fR\fIpath-to-file\fR" 4 |
|
719 .IX Item "--add-gnu-debuglink=path-to-file" |
|
720 Creates a .gnu_debuglink section which contains a reference to \fIpath-to-file\fR |
|
721 and adds it to the output file. |
|
722 .IP "\fB\-\-keep\-file\-symbols\fR" 4 |
|
723 .IX Item "--keep-file-symbols" |
|
724 When stripping a file, perhaps with \fB\-\-strip\-debug\fR or |
|
725 \&\fB\-\-strip\-unneeded\fR, retain any symbols specifying source file names, |
|
726 which would otherwise get stripped. |
|
727 .IP "\fB\-\-only\-keep\-debug\fR" 4 |
|
728 .IX Item "--only-keep-debug" |
|
729 Strip a file, removing contents of any sections that would not be |
|
730 stripped by \fB\-\-strip\-debug\fR and leaving the debugging sections |
|
731 intact. In \s-1ELF\s0 files, this preserves all note sections in the output. |
|
732 .Sp |
|
733 The intention is that this option will be used in conjunction with |
|
734 \&\fB\-\-add\-gnu\-debuglink\fR to create a two part executable. One a |
|
735 stripped binary which will occupy less space in \s-1RAM\s0 and in a |
|
736 distribution and the second a debugging information file which is only |
|
737 needed if debugging abilities are required. The suggested procedure |
|
738 to create these files is as follows: |
|
739 .RS 4 |
|
740 .IP "1.<Link the executable as normal. Assuming that is is called>" 4 |
|
741 .IX Item "1.<Link the executable as normal. Assuming that is is called>" |
|
742 \&\f(CW\*(C`foo\*(C'\fR then... |
|
743 .ie n .IP "1.<Run ""objcopy \-\-only\-keep\-debug foo foo.dbg"" to>" 4 |
|
744 .el .IP "1.<Run \f(CWobjcopy \-\-only\-keep\-debug foo foo.dbg\fR to>" 4 |
|
745 .IX Item "1.<Run objcopy --only-keep-debug foo foo.dbg to>" |
|
746 create a file containing the debugging info. |
|
747 .ie n .IP "1.<Run ""objcopy \-\-strip\-debug foo"" to create a>" 4 |
|
748 .el .IP "1.<Run \f(CWobjcopy \-\-strip\-debug foo\fR to create a>" 4 |
|
749 .IX Item "1.<Run objcopy --strip-debug foo to create a>" |
|
750 stripped executable. |
|
751 .ie n .IP "1.<Run ""objcopy \-\-add\-gnu\-debuglink=foo.dbg foo"">" 4 |
|
752 .el .IP "1.<Run \f(CWobjcopy \-\-add\-gnu\-debuglink=foo.dbg foo\fR>" 4 |
|
753 .IX Item "1.<Run objcopy --add-gnu-debuglink=foo.dbg foo>" |
|
754 to add a link to the debugging info into the stripped executable. |
|
755 .RE |
|
756 .RS 4 |
|
757 .Sp |
|
758 Note\-\-\-the choice of \f(CW\*(C`.dbg\*(C'\fR as an extension for the debug info |
|
759 file is arbitrary. Also the \f(CW\*(C`\-\-only\-keep\-debug\*(C'\fR step is |
|
760 optional. You could instead do this: |
|
761 .IP "1.<Link the executable as normal.>" 4 |
|
762 .IX Item "1.<Link the executable as normal.>" |
|
763 .PD 0 |
|
764 .ie n .IP "1.<Copy ""foo""\fR to \f(CW""foo.full"">" 4 |
|
765 .el .IP "1.<Copy \f(CWfoo\fR to \f(CWfoo.full\fR>" 4 |
|
766 .IX Item "1.<Copy foo to foo.full>" |
|
767 .ie n .IP "1.<Run ""objcopy \-\-strip\-debug foo"">" 4 |
|
768 .el .IP "1.<Run \f(CWobjcopy \-\-strip\-debug foo\fR>" 4 |
|
769 .IX Item "1.<Run objcopy --strip-debug foo>" |
|
770 .ie n .IP "1.<Run ""objcopy \-\-add\-gnu\-debuglink=foo.full foo"">" 4 |
|
771 .el .IP "1.<Run \f(CWobjcopy \-\-add\-gnu\-debuglink=foo.full foo\fR>" 4 |
|
772 .IX Item "1.<Run objcopy --add-gnu-debuglink=foo.full foo>" |
|
773 .RE |
|
774 .RS 4 |
|
775 .PD |
|
776 .Sp |
|
777 i.e., the file pointed to by the \fB\-\-add\-gnu\-debuglink\fR can be the |
|
778 full executable. It does not have to be a file created by the |
|
779 \&\fB\-\-only\-keep\-debug\fR switch. |
|
780 .Sp |
|
781 Note\-\-\-this switch is only intended for use on fully linked files. It |
|
782 does not make sense to use it on object files where the debugging |
|
783 information may be incomplete. Besides the gnu_debuglink feature |
|
784 currently only supports the presence of one filename containing |
|
785 debugging information, not multiple filenames on a one-per-object-file |
|
786 basis. |
|
787 .RE |
|
788 .IP "\fB\-\-extract\-symbol\fR" 4 |
|
789 .IX Item "--extract-symbol" |
|
790 Keep the file's section flags and symbols but remove all section data. |
|
791 Specifically, the option: |
|
792 .RS 4 |
|
793 .IP "*<sets the virtual and load addresses of every section to zero;>" 4 |
|
794 .IX Item "*<sets the virtual and load addresses of every section to zero;>" |
|
795 .PD 0 |
|
796 .IP "*<removes the contents of all sections;>" 4 |
|
797 .IX Item "*<removes the contents of all sections;>" |
|
798 .IP "*<sets the size of every section to zero; and>" 4 |
|
799 .IX Item "*<sets the size of every section to zero; and>" |
|
800 .IP "*<sets the file's start address to zero.>" 4 |
|
801 .IX Item "*<sets the file's start address to zero.>" |
|
802 .RE |
|
803 .RS 4 |
|
804 .PD |
|
805 .Sp |
|
806 This option is used to build a \fI.sym\fR file for a VxWorks kernel. |
|
807 It can also be a useful way of reducing the size of a \fB\-\-just\-symbols\fR |
|
808 linker input file. |
|
809 .RE |
|
810 .IP "\fB\-V\fR" 4 |
|
811 .IX Item "-V" |
|
812 .PD 0 |
|
813 .IP "\fB\-\-version\fR" 4 |
|
814 .IX Item "--version" |
|
815 .PD |
|
816 Show the version number of \fBobjcopy\fR. |
|
817 .IP "\fB\-v\fR" 4 |
|
818 .IX Item "-v" |
|
819 .PD 0 |
|
820 .IP "\fB\-\-verbose\fR" 4 |
|
821 .IX Item "--verbose" |
|
822 .PD |
|
823 Verbose output: list all object files modified. In the case of |
|
824 archives, \fBobjcopy \-V\fR lists all members of the archive. |
|
825 .IP "\fB\-\-help\fR" 4 |
|
826 .IX Item "--help" |
|
827 Show a summary of the options to \fBobjcopy\fR. |
|
828 .IP "\fB\-\-info\fR" 4 |
|
829 .IX Item "--info" |
|
830 Display a list showing all architectures and object formats available. |
|
831 .IP "\fB@\fR\fIfile\fR" 4 |
|
832 .IX Item "@file" |
|
833 Read command-line options from \fIfile\fR. The options read are |
|
834 inserted in place of the original @\fIfile\fR option. If \fIfile\fR |
|
835 does not exist, or cannot be read, then the option will be treated |
|
836 literally, and not removed. |
|
837 .Sp |
|
838 Options in \fIfile\fR are separated by whitespace. A whitespace |
|
839 character may be included in an option by surrounding the entire |
|
840 option in either single or double quotes. Any character (including a |
|
841 backslash) may be included by prefixing the character to be included |
|
842 with a backslash. The \fIfile\fR may itself contain additional |
|
843 @\fIfile\fR options; any such options will be processed recursively. |
|
844 .SH "SEE ALSO" |
|
845 .IX Header "SEE ALSO" |
|
846 \&\fIld\fR\|(1), \fIobjdump\fR\|(1), and the Info entries for \fIbinutils\fR. |
|
847 .SH "COPYRIGHT" |
|
848 .IX Header "COPYRIGHT" |
|
849 Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, |
|
850 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc. |
|
851 .PP |
|
852 Permission is granted to copy, distribute and/or modify this document |
|
853 under the terms of the \s-1GNU\s0 Free Documentation License, Version 1.2 |
|
854 or any later version published by the Free Software Foundation; |
|
855 with no Invariant Sections, with no Front-Cover Texts, and with no |
|
856 Back-Cover Texts. A copy of the license is included in the |
|
857 section entitled \*(L"\s-1GNU\s0 Free Documentation License\*(R". |