Why Linux/gnu linker chose address 0x400000?

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The start address is usually set by a linker script.

For example, on GNU/Linux, looking at /usr/lib/ldscripts/elf_x86_64.x we see:

...
PROVIDE (__executable_start = SEGMENT_START("text-segment", 0x400000)); \
    . = SEGMENT_START("text-segment", 0x400000) + SIZEOF_HEADERS;

The value 0x400000 is the default value for the SEGMENT_START() function on this platform.

You can find out more about linker scripts by browsing the linker manual:

% info ld Scripts

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