[PATCH 04/10] MIPS: math-emu: cp1emu: Add support for the MIPS R6 SELNEZ FPU instruction
From: Markos Chandras <hidden>
Date: 2015-08-13 07:59:31
Subsystem:
mips, the rest · Maintainers:
Thomas Bogendoerfer, Linus Torvalds
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 <redacted> --- arch/mips/math-emu/cp1emu.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+)
diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c
index 9cb46e1f8d8f..66d9a78d03ad 100644
--- a/arch/mips/math-emu/cp1emu.c
+++ b/arch/mips/math-emu/cp1emu.c@@ -1736,6 +1736,17 @@ 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;
@@ -1945,6 +1956,17 @@ 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;
--
2.5.0