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1 LWLINK linker scripts
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2
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3 A linker script is used to instruct the linker about how to assemble the
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4 various sections into a completed binary. It consists of a series of
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5 directives which are considered in the order they are encountered. Any
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6 section not referenced by a directive is assumed to be loaded after the
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7 final section explicitly referenced.
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8
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9 The sections will appear in the resulting binary in the order they are
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10 specified in the script file.
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11
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12 If a referenced section is not found, the linker will behave as though the
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13 section did exist but had a zero size, no relocations, and no exports.
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14
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15 A section may only be referenced once. Any subsequent references will have
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16 no effect.
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17
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18 All numbers are hexadecimal.
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19
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20 section <name> load <addr>
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21
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22 This causes the section <name> to load at <addr>. For raw target, only one
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23 "load at" entry is allowed for non-bss sections and it must be the first
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24 one. For raw targets, it affects the addresses the linker assigns to symbols
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25 but has no other affect on the output. bss sections may all have separate
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26 load addresses but since they will not appear in the binary anyway, this is
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27 okay.
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28
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29 For the DECB target, each "load" entry will cause a new "block" to be
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30 output to the binary which will contain the load address. It is legal for
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31 sections to overlap in this manner - the linker assumes the loader will sort
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32 everything out.
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33
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34 section <name>
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35
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36 This will cause the section <name> to load after the previously listed
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37 section.
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38
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39 exec <addr or sym>
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40
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41 This will cause the execution address (entry point) to be the address
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42 specified (in hex) *or* the specified symbol name. The symbol name must
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43 match a symbol that is exported by one of the object files being linked.
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44 This has no effect for targets that do not encode the entry point into the
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45 resulting file. If not specified, the entry point is assumed to be address 0
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46 which is probably not what you want. The default link scripts for targets
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47 that support this directive automatically starts at the beginning of the
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48 first section (usually "init" or "code") that is emitted in the binary.
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49
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50 pad <size>
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51
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52 This will cause the output file to be padded with NUL bytes to be exactly
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53 <size> bytes in length. This only makes sense for a raw target.
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54
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55
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56 If <name> is "*", then any section not already matched by the script will be
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57 matched. For format *,<flags> can be used to select sections which have
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58 particular flags set (or not set). For instance:
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59
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60 *,!bss This would match all sections that do not have the bss flag set
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61 *,bss this would match all sections that do have the bss flag set
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62
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63
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