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LLVM's lld and GNU's ld have different ways of handling assignments in
output sections. Unless we specify ABSOLUTE, ld treats the number '0' as
a relative address from the section start, 0x6000_0000. On the other
hand, lld treats '0' as if it were written with ABSOLUTE, and it ignores
the ABSOLUTE function. So depending on your linker, __dcd would change
values.
This commit forces an absolute number for __dcd, ensuring a consistent
value no matter the linker.
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This development leftover should have been dropped after releasing
imxrt-ral 0.5.
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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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We can still maintain individual linker script components, then write
them into one, larger linker script. We're effectively implementing the
same behavior as INCLUDE while disallowing overrides of the linker
search path to find the INCLUDEd files.
Once we have one linker script, we can refactor for easier unit testing.
This commit adds simple unit tests for the default builder, and some of
the expected errors.
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The reset handler of 0.7.2 pushes four bytes onto the stack, resulting
in a misaligned stack pointer once the next procedure (main) is called.
Compilers are free to assume that the stack is eight byte aligned when
optimizing code. We depend on this reset handler, so this affects
imxrt-rt users.
Take the approach recommended in the cortex-m-rt advisory and update to
0.7.3. I tested this by building and running the two examples in this
repo on a 1010EVK. Also tested in imxrt-hal by building and running
examples on a 1010EVK.
cortex-m-rt 0.7.2 is yanked. Since imxrt-rt 0.1.0 fixes its cortex-m-rt
version, it will no longer build. I have no plan to also yank imxrt-rt
0.1.0; the upstream yank already signals that something is broken.
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No need for us to set VTOR and the stack pointer anymore.
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Might help the next person who wants to add a new family. There's a way
to defeat this lint when the enum is (Partial)Eq: use if / else to
emulate a fallthrough. I can't find _another_ lint that would prevent
that pattern, so I'll try to be vigilent here.
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