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Most .S files don't indent directives, so don't indent them here either.
Also, one file had tabs instead of spaces, `:retab` that file.
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The System V ABI for both x86 and x86_64 requires that the stack pointer
is 16-byte aligned on entry. Previously we did not align the stack
pointer properly.
As far as "main" was concerned the stack alignment was correct even
without this patch due to how the C++ _start function and the kernel
interacted, i.e. the kernel misaligned the stack as far as the ABI
was concerned but that misalignment (read: it was properly aligned for
a regular function call - but misaligned in terms of what the ABI
dictates) was actually expected by our _start function.
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Tweak the PLT trampoline to avoid generating textrels in LibC.
This allows us to share all the LibC mappings, reducing per-process
memory consumption by ~200 KB. :^)
Patch originally by @nico.
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