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| H A D | head_32.h | diff c06f0aff035ed5a7eaff5daa8e11e7ad28ab0d54 Fri Jan 31 05:34:55 CST 2020 Christophe Leroy <christophe.leroy@c-s.fr> powerpc: Don't use thread struct for saving SRR0/1 on syscall.
CR0 can be saved later, and CTR can also be used for saving.
Keep SRR1 in r9 and stash SRR0 in CTR, this avoids using thread_struct
in memory for that.
Saves 3 cycles (ie 1%) in null_syscall selftest on 8xx.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/b94c3bc03bac9431fec2dadb686384c481889422.1580470483.git.christophe.leroy@c-s.fr
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