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MIPS: math-emu: Add support for the MIPS R6 SELNEZ FPU instruction 

MIPS R6 introduced the following instruction:
SELNEZ.fmt: FPR[fd]  FPR[ft].bit0 ? FPR[fs] : 0

Add support for emulating the single and double precision
formats of the said instruction.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/10955/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Markos Chandras 2015-08-13 09:56:30 +02:00 committed by Ralf Baechle
parent 67613f0278
commit 130fe357ee
1 changed files with 22 additions and 0 deletions
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22
arch/mips/math-emu/cp1emu.c
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@ -1754,6 +1754,17 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
SPFROMREG(rv.s, MIPSInst_FS(ir));
break;
case fselnez_op:
if (!cpu_has_mips_r6)
return SIGILL;
SPFROMREG(rv.s, MIPSInst_FT(ir));
if (rv.w & 0x1)
SPFROMREG(rv.s, MIPSInst_FS(ir));
else
rv.w = 0;
break;
case fabs_op:
handler.u = ieee754sp_abs;
goto scopuop;
@ -1963,6 +1974,17 @@ copcsr:
DPFROMREG(rv.d, MIPSInst_FS(ir));
break;
case fselnez_op:
if (!cpu_has_mips_r6)
return SIGILL;
DPFROMREG(rv.d, MIPSInst_FT(ir));
if (rv.l & 0x1)
DPFROMREG(rv.d, MIPSInst_FS(ir));
else
rv.l = 0;
break;
case fabs_op:
handler.u = ieee754dp_abs;
goto dcopuop;