MIPS: kernel: mips-r2-to-r6-emul: Add R2 emulator for MIPS R6

Browse source

MIPS R6 removed quite a few R2 instructions. However, there
is plenty of <R6 userland code so we add an in-kernel emulator
so we can still be able to execute all R2 userland out there.

The emulator comes with a handy debugfs under /mips/ directory
(r2-emul-stats) to provide some basic statistics of the
instructions that are being emulated.

Below are some statistics from booting a minimal buildroot image:

Instruction     Total   BDslot
------------------------------
movs            236969  0
hilo            56686   0
muls            55279   0
divs            10941   0
dsps            0       0
bops            1       0
traps           0       0
fpus            0       0
loads           214981  17
stores          103364  0
llsc            56898   0
dsemul          150418  0
jr              370158
bltzl           43
bgezl           1594
bltzll          0
bgezll          0
bltzal          39
bgezal          39
beql            14503
bnel            138741
blezl           0
bgtzl           3988

Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>

...

This commit is contained in:

Leonid Yegoshin 2014-12-03 15:47:03 +00:00 • committed by Markos Chandras

parent b55b9e2715

commit b0a668fb20

8 changed files with 2518 additions and 5 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

13

arch/mips/Kconfig

View file

3

arch/mips/include/asm/branch.h

View file

96

arch/mips/include/asm/mips-r2-to-r6-emul.h

View file

1

arch/mips/kernel/Makefile

View file

1

arch/mips/kernel/branch.c

View file

2378

arch/mips/kernel/mips-r2-to-r6-emul.c

View file

28

arch/mips/kernel/traps.c

View file

3

arch/mips/math-emu/cp1emu.c

View file