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MIPS: math-emu: Factor out CFC1/CTC1 emulation

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Move CFC1/CTC1 emulation code to separate functions to avoid excessive
indentation in forthcoming changes.  Adjust formatting in a minor way
and remove extraneous round brackets.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9682/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Maciej W. Rozycki 2015-04-03 23:25:04 +01:00 committed by Ralf Baechle
parent cb5d4aad68
commit d4f5b08893
1 changed files with 48 additions and 28 deletions
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76
arch/mips/math-emu/cp1emu.c
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@ -839,6 +839,52 @@ do { \
#define DPFROMREG(dp, x) DIFROMREG((dp).bits, x)
#define DPTOREG(dp, x) DITOREG((dp).bits, x)
/*
* Emulate a CFC1 instruction.
*/
static inline void cop1_cfc(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
mips_instruction ir)
{
u32 value;
if (MIPSInst_RD(ir) == FPCREG_CSR) {
value = ctx->fcr31;
pr_debug("%p gpr[%d]<-csr=%08x\n",
(void *)xcp->cp0_epc,
MIPSInst_RT(ir), value);
} else if (MIPSInst_RD(ir) == FPCREG_RID)
value = 0;
else
value = 0;
if (MIPSInst_RT(ir))
xcp->regs[MIPSInst_RT(ir)] = value;
}
/*
* Emulate a CTC1 instruction.
*/
static inline void cop1_ctc(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
mips_instruction ir)
{
u32 value;
if (MIPSInst_RT(ir) == 0)
value = 0;
else
value = xcp->regs[MIPSInst_RT(ir)];
/* we only have one writable control reg
*/
if (MIPSInst_RD(ir) == FPCREG_CSR) {
pr_debug("%p gpr[%d]->csr=%08x\n",
(void *)xcp->cp0_epc,
MIPSInst_RT(ir), value);
/* Don't write reserved bits. */
ctx->fcr31 = value & ~FPU_CSR_RSVD;
}
}
/*
* Emulate the single floating point instruction pointed at by EPC.
* Two instructions if the instruction is in a branch delay slot.
@ -853,7 +899,6 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
int likely, pc_inc;
u32 __user *wva;
u64 __user *dva;
u32 value;
u32 wval;
u64 dval;
int sig;
@ -1046,37 +1091,12 @@ emul:
case cfc_op:
/* cop control register rd -> gpr[rt] */
if (MIPSInst_RD(ir) == FPCREG_CSR) {
value = ctx->fcr31;
pr_debug("%p gpr[%d]<-csr=%08x\n",
(void *) (xcp->cp0_epc),
MIPSInst_RT(ir), value);
}
else if (MIPSInst_RD(ir) == FPCREG_RID)
value = 0;
else
value = 0;
if (MIPSInst_RT(ir))
xcp->regs[MIPSInst_RT(ir)] = value;
cop1_cfc(xcp, ctx, ir);
break;
case ctc_op:
/* copregister rd <- rt */
if (MIPSInst_RT(ir) == 0)
value = 0;
else
value = xcp->regs[MIPSInst_RT(ir)];
/* we only have one writable control reg
*/
if (MIPSInst_RD(ir) == FPCREG_CSR) {
pr_debug("%p gpr[%d]->csr=%08x\n",
(void *) (xcp->cp0_epc),
MIPSInst_RT(ir), value);
/* Don't write reserved bits. */
ctx->fcr31 = value & ~FPU_CSR_RSVD;
}
cop1_ctc(xcp, ctx, ir);
if ((ctx->fcr31 >> 5) & ctx->fcr31 & FPU_CSR_ALL_E) {
return SIGFPE;
}