MIPS: Coding style cleanups of access of FCSR rounding mode bits

Replaces references to the magic number 0x3 with constants and macros
indicating the real purpose of those bits.  They are the rounding mode
bits of the FCSR register.

Signed-off-by: Shane McDonald <mcdonald.shane@gmail.com>
To: anemo@mba.ocn.ne.jp
To: kevink@paralogos.com
To: linux-mips@linux-mips.org
To: sshtylyov@mvista.com
Patchwork: http://patchwork.linux-mips.org/patch/1206/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/math-emu/cp1emu.c

@@ -354,7 +354,8 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_struct *ctx)
 
 			if (MIPSInst_RD(ir) == FPCREG_CSR) {
 				value = ctx->fcr31;
-				value = (value & ~0x3) | mips_rm[value & 0x3];
+				value = (value & ~FPU_CSR_RM) |
+					mips_rm[modeindex(value)];
 #ifdef CSRTRACE
 				printk("%p gpr[%d]<-csr=%08x\n",
 					(void *) (xcp->cp0_epc),
@@ -907,7 +908,7 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
 			ieee754sp fs;
 
 			SPFROMREG(fs, MIPSInst_FS(ir));
-			ieee754_csr.rm = ieee_rm[MIPSInst_FUNC(ir) & 0x3];
+			ieee754_csr.rm = ieee_rm[modeindex(MIPSInst_FUNC(ir))];
 			rv.w = ieee754sp_tint(fs);
 			ieee754_csr.rm = oldrm;
 			rfmt = w_fmt;
@@ -933,7 +934,7 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
 			ieee754sp fs;
 
 			SPFROMREG(fs, MIPSInst_FS(ir));
-			ieee754_csr.rm = ieee_rm[MIPSInst_FUNC(ir) & 0x3];
+			ieee754_csr.rm = ieee_rm[modeindex(MIPSInst_FUNC(ir))];
 			rv.l = ieee754sp_tlong(fs);
 			ieee754_csr.rm = oldrm;
 			rfmt = l_fmt;
@@ -1081,7 +1082,7 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
 			ieee754dp fs;
 
 			DPFROMREG(fs, MIPSInst_FS(ir));
-			ieee754_csr.rm = ieee_rm[MIPSInst_FUNC(ir) & 0x3];
+			ieee754_csr.rm = ieee_rm[modeindex(MIPSInst_FUNC(ir))];
 			rv.w = ieee754dp_tint(fs);
 			ieee754_csr.rm = oldrm;
 			rfmt = w_fmt;
@@ -1107,7 +1108,7 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
 			ieee754dp fs;
 
 			DPFROMREG(fs, MIPSInst_FS(ir));
-			ieee754_csr.rm = ieee_rm[MIPSInst_FUNC(ir) & 0x3];
+			ieee754_csr.rm = ieee_rm[modeindex(MIPSInst_FUNC(ir))];
 			rv.l = ieee754dp_tlong(fs);
 			ieee754_csr.rm = oldrm;
 			rfmt = l_fmt;