Commit 6daaa326 authored Oct 31, 2016 by Maciej W. Rozycki Committed by Ralf Baechle Nov 04, 2016

MIPS: Remove FIR from ISA I FP signal context



Complement commit e50c0a8f ("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.

[ralf@linux-mips.org: This is also required because the next commit depends
on it.]

Signed-off-by: Maciej W. Rozycki <macro@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14475/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

parent 35938a00

arch/mips/kernel/r2300_fpu.S

+1 −5

Original line number	Diff line number	Diff line
		@@ -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)

		/*