Allocate and initialize a thread-local block for each thread at the
top of the stack.
Set the tls base when switching to a new thread.
Add tdata/tbss linker instructions to cortex_m and risc-v scripts.
Signed-off-by: Keith Packard <keithp@keithp.com>
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v2:
Squash fixes
v3:
Replace tabs with spaces
v4:
Add tbss to fe310 linker script
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