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Otherwise, gp will be used to load gp...
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GCC's softfloat is built by default without support for dynamic
rounding modes. This makes softfloat newlib's floating point always
round-to-zero, and returns a failure code when trying to set it.
This patch is needed to make newlib compile on anything without F, as
it used to try use an undefined instruction to do this.
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You're only supposed to return 0 if the exception mask was set
correctly, and this doesn't set the mask at all.
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I screwed up when porting it to the new calling convention.
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Thread-local storage shouldn't be affected by these calls.
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"jump" was renamed to "tail" (as in tail call) and may freely clobber a
t-register, as before. A new "jump" was added that requires a second
argument, which is the scratch register it may clobber.
"tail" should be used for tail calls; "jump" should be used for
intraprocedural jumps more than 1 MiB away.
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h/t Martin Maas
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v0-1 are removed; arguments are now returned in a0-1. Registers are
renumbered so that s0-1 and a0-5 map to x8-15 to simplify the RVC ISA.
(These are the most popular 8 registers besides x0 and sp.)
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