The linker command language includes a command specifically for defining the first executable instruction in an output file (its entry point). Its argument is a symbol name:
Like symbol assignments, the
ENTRY command may be placed either
as an independent command in the command file, or among the section
definitions within the
SECTIONS command--whatever makes the most
sense for your layout.
ENTRY is only one of several ways of choosing the entry point.
You may indicate it in any of the following ways (shown in descending
order of priority: methods higher in the list override methods lower down).
ENTRY(symbol)command in a linker control script;
start, if present;
.textsection, if present;
For example, you can use these rules to generate an entry point with an
assignment statement: if no symbol
start is defined within your
input files, you can simply define it, assigning it an appropriate
start = 0x2020;
The example shows an absolute address, but you can use any expression.
For example, if your input object files use some other symbol-name
convention for the entry point, you can just assign the value of
whatever symbol contains the start address to
start = other_symbol ;
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