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If you define a runtime, you can call `stack_size_env_override` to
define an optional environment variable checked by the runtime builder.
Same goes for the heap. A user can set these environment variables to
override the runtime's stack / heap size. You can use this package's
examples to try it out; see the updated build script.
There's no default environment variable for either memory region. The
package that defines the runtime needs to opt-in to this feature.
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Haven't fully dug into this one, but GNU ld and LLVM lld have slightly
different section positions when we cross from text to data. We can
relax the asserts to show ordering without strictly requiring an offset.
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Depending on the ordering and contents of program headers, the previous
predicate for "is this the program header for this section?" could
select the wrong header. GNU's ld and LLVM's lld produce that different
header ordering and contents, causing select asserts to fail when using
GNU's linker.
This commit changes how we select the program header, approximating the
way GNU objdump figures the value. This new approach needs more
information from the section header, so I'm changing the API to make it
easier to call the section_header method.
The previous approach was influenced by LLVM objdump. Turns out that
LLVM objdump will also compute the wrong LMA for these binaries when
they're linked with GNU ld. GNU objdump always produces the correct
section LMA, no matter the LLVM or GNU linker.
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Users can define their device configuration data (DCD), and place the
data in the .dcd section. If the .dcd section has content, the entry in
the IVT points at the user's DCD. This plays well with imxrt-dcd.
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