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MIPS: microMIPS: Add support for exception handling.

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All exceptions must be taken in microMIPS mode, never in classic
MIPS mode or the kernel falls apart. A few NOP instructions are
used to maintain the correct alignment of microMIPS versions of
the exception vectors.

Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
This commit is contained in:
Steven J. Hill
2013-03-25 12:15:55 -05:00
committed by Ralf Baechle
parent 102cedc32a
commit 2a0b24f56c
9 changed files with 352 additions and 106 deletions
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9
arch/mips/kernel/scall32-o32.S
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@@ -138,9 +138,18 @@ stackargs:
5: jr t1
sw t5, 16(sp) # argument #5 to ksp
#ifdef CONFIG_CPU_MICROMIPS
sw t8, 28(sp) # argument #8 to ksp
nop
sw t7, 24(sp) # argument #7 to ksp
nop
sw t6, 20(sp) # argument #6 to ksp
nop
#else
sw t8, 28(sp) # argument #8 to ksp
sw t7, 24(sp) # argument #7 to ksp
sw t6, 20(sp) # argument #6 to ksp
#endif
6: j stack_done # go back
nop
.set pop