Mercurial > hg-old > index.cgi
diff doc/scripts.txt @ 295:7a3d66e72a4c
Added some basic documentation of the linker
author | lost |
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date | Sat, 17 Jan 2009 20:54:20 +0000 |
parents | |
children | 9c6462b3a288 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/doc/scripts.txt Sat Jan 17 20:54:20 2009 +0000 @@ -0,0 +1,46 @@ +LWLINK linker scripts + +A linker script is used to instruct the linker about how to assemble the +various sections into a completed binary. It consists of a series of +directives which are considered in the order they are encountered. Any +section not referenced by a directive is assumed to be loaded after the +final section explicitly referenced. + +A section may only be referenced once. Any subsequent references will have +no effect. + +section <name> load at <addr> + +This causes the section <name> to load at <addr>. For raw target, only one +"load at" entry is allowed for non-bss sections and it must be the first +one. For raw targets, it affects the addresses the linker assigns to symbols +but has no other affect on the output. bss sections may all have separate +load addresses but since they will not appear in the binary anyway, this is +okay. + +For the DECB target, each "load at" entry will cause a new "block" to be +output to the binary which will contain the load address. It is legal for +sections to overlap in this manner - the linker assumes the loader will sort +everything out. + +section <name> load after <name2> + +This will cause the section <name> to load after <name2>. This has the +effect of essentially gluing <name> onto the end of <name2>. If multiple +sections are specified to load after a particular section, they will load in +the order specified. + +pad to <size> + +This will cause the output file to be padded with NUL bytes to be exactly +<size> bytes in length. This only makes sense for a raw target. + + +If <name> is "*", then any section not already matched by the script will be +matched. For format *,<flags> can be used to select sections which have +particular flags set (or not set). For instance: + +*,!bss This would match all sections that do not have the bss flag set +*,bss this would match all sections that do have the bss flag set + +