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Subject[PATCH 2/4] MIPS: Remove FIR from ISA I FP signal context
Complement commit e50c0a8fa60d ("Support the MIPS32 / MIPS64 DSP ASE.") 
and remove the Floating Point Implementation Register (FIR) from the FP
register set recorded in a signal context with MIPS I processors too, in
line with the change applied to r4k_fpu.S.

The `sc_fpc_eir' slot is unused according to our current ABI and the FIR
register is read-only and always directly accessible from user software.

Signed-off-by: Maciej W. Rozycki <macro@imgtec.com>
---
linux-mips-isa1-sig-fp-context-dsp.patch
Index: linux-sfr-test/arch/mips/kernel/r2300_fpu.S
===================================================================
--- linux-sfr-test.orig/arch/mips/kernel/r2300_fpu.S 2016-10-22 02:17:38.000000000 +0100
+++ linux-sfr-test/arch/mips/kernel/r2300_fpu.S 2016-10-22 02:19:40.565112000 +0100
@@ -64,13 +64,9 @@ LEAF(_save_fp_context)
EX(swc1 $f29,(SC_FPREGS+232)(a0))
EX(swc1 $f30,(SC_FPREGS+240)(a0))
EX(swc1 $f31,(SC_FPREGS+248)(a0))
- EX(sw t1,(SC_FPC_CSR)(a0))
- cfc1 t0,$0 # implementation/version
jr ra
+ EX(sw t1,(SC_FPC_CSR)(a0))
.set pop
- .set nomacro
- EX(sw t0,(SC_FPC_EIR)(a0))
- .set macro
END(_save_fp_context)

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