diff options
Diffstat (limited to 'arch/mips/math-emu/cp1emu.c')
| -rw-r--r-- | arch/mips/math-emu/cp1emu.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c index 3a90170a6277..d31c537ace1d 100644 --- a/arch/mips/math-emu/cp1emu.c +++ b/arch/mips/math-emu/cp1emu.c @@ -908,6 +908,7 @@ static inline void cop1_ctc(struct pt_regs *xcp, struct mips_fpu_struct *ctx, { u32 fcr31 = ctx->fcr31; u32 value; + u32 mask; if (MIPSInst_RT(ir) == 0) value = 0; @@ -919,9 +920,9 @@ static inline void cop1_ctc(struct pt_regs *xcp, struct mips_fpu_struct *ctx, pr_debug("%p gpr[%d]->csr=%08x\n", (void *)xcp->cp0_epc, MIPSInst_RT(ir), value); - /* Don't write unsupported bits. */ - fcr31 = value & - ~(FPU_CSR_RSVD | FPU_CSR_ABS2008 | FPU_CSR_NAN2008); + /* Preserve read-only bits. */ + mask = current_cpu_data.fpu_msk31; + fcr31 = (value & ~mask) | (fcr31 & mask); break; case FPCREG_FENR: |