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| author |   Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> | 2014-12-03 15:47:03 +0000 |
|---|---|---|
| committer |   Markos Chandras <markos.chandras@imgtec.com> | 2015-02-17 15:37:37 +0000 |
| commit | b0a668fb2038d846a466c7a16a358d874002b697 (patch) | |
| tree | 78e1a41109308a34e08dd552ddf6834f085d288c /arch/mips/Kconfig | |
| parent | MIPS: asm: mipsregs: Add support for the LLADDR register (diff) | |
| download | linux-dev-b0a668fb2038d846a466c7a16a358d874002b697.tar.xz linux-dev-b0a668fb2038d846a466c7a16a358d874002b697.zip | |
MIPS: kernel: mips-r2-to-r6-emul: Add R2 emulator for MIPS R6
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>
Diffstat (limited to 'arch/mips/Kconfig')
| -rw-r--r-- | arch/mips/Kconfig | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 883eb3aacedf..afa808ab9f44 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -2063,6 +2063,19 @@ config MIPS_MT_FPAFF default y depends on MIPS_MT_SMP +config MIPSR2_TO_R6_EMULATOR + bool "MIPS R2-to-R6 emulator" + depends on CPU_MIPSR6 && !SMP + default y + help + Choose this option if you want to run non-R6 MIPS userland code. + Even if you say 'Y' here, the emulator will still be disabled by + default. You can enable it using the 'mipsr2emul' kernel option. + The only reason this is a build-time option is to save ~14K from the + final kernel image. +comment "MIPS R2-to-R6 emulator is only available for UP kernels" + depends on SMP && CPU_MIPSR6 + config MIPS_VPE_LOADER bool "VPE loader support." depends on SYS_SUPPORTS_MULTITHREADING && MODULES |