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MIPS: Use unchecked immediate addition/subtraction

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In MIPS assembly there have historically been 2 variants of immediate
addition - the standard "addi" which traps if an overflow occurs, and
the unchecked "addiu" which does not trap on overflow. In release 6 of
the MIPS architecture the trapping variants of immediate addition &
subtraction have been removed. In preparation for supporting MIPSr6,
stop using the trapping instructions from assembly & switch to their
unchecked variants.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
This commit is contained in:
Paul Burton
2016-05-16 10:52:10 +01:00
committed by Daniel Schwierzeck
parent 400df30998
commit 9f8ac82452
2 changed files with 13 additions and 11 deletions
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2
arch/mips/lib/cache_init.S
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@@ -64,7 +64,7 @@
/* detect associativity */
srl \sz, $1, \off + MIPS_CONF1_DA_SHF - MIPS_CONF1_DA_SHF
andi \sz, \sz, (MIPS_CONF1_DA >> MIPS_CONF1_DA_SHF)
addi \sz, \sz, 1
addiu \sz, \sz, 1
/* sz *= line_sz */
mul \sz, \sz, \line_sz