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| author | Markos Chandras <markos.chandras@imgtec.com> | 2015-08-13 09:56:30 +0200 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2015-09-03 12:08:13 +0200 |
| commit | 130fe357ee895421a4aefef7b1285bf52f295afe (patch) | |
| tree | d21c7a7f04c28fcbc62d925b9c2ef86e550f0d0d /arch/mips | |
| parent | 67613f02788d73541c7c9b1c851061b8c223057b (diff) | |
| download | lwn-130fe357ee895421a4aefef7b1285bf52f295afe.tar.gz lwn-130fe357ee895421a4aefef7b1285bf52f295afe.zip | |
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>
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/math-emu/cp1emu.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c index 02ba536f1594..8978d52adf0e 100644 --- a/arch/mips/math-emu/cp1emu.c +++ b/arch/mips/math-emu/cp1emu.c @@ -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; |