diff options
Diffstat (limited to 'arch/nds32/kernel/fpu.c')
| -rw-r--r-- | arch/nds32/kernel/fpu.c | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/arch/nds32/kernel/fpu.c b/arch/nds32/kernel/fpu.c index 2942df6f93e6..fddd40c7a16f 100644 --- a/arch/nds32/kernel/fpu.c +++ b/arch/nds32/kernel/fpu.c @@ -12,7 +12,10 @@ const struct fpu_struct init_fpuregs = { .fd_regs = {[0 ... 31] = sNAN64}, - .fpcsr = FPCSR_INIT + .fpcsr = FPCSR_INIT, +#if IS_ENABLED(CONFIG_SUPPORT_DENORMAL_ARITHMETIC) + .UDF_trap = 0 +#endif }; void save_fpu(struct task_struct *tsk) @@ -174,6 +177,9 @@ inline void do_fpu_context_switch(struct pt_regs *regs) } else { /* First time FPU user. */ load_fpu(&init_fpuregs); +#if IS_ENABLED(CONFIG_SUPPORT_DENORMAL_ARITHMETIC) + current->thread.fpu.UDF_trap = init_fpuregs.UDF_trap; +#endif set_used_math(); } @@ -183,10 +189,12 @@ inline void fill_sigfpe_signo(unsigned int fpcsr, int *signo) { if (fpcsr & FPCSR_mskOVFT) *signo = FPE_FLTOVF; - else if (fpcsr & FPCSR_mskIVOT) - *signo = FPE_FLTINV; +#ifndef CONFIG_SUPPORT_DENORMAL_ARITHMETIC else if (fpcsr & FPCSR_mskUDFT) *signo = FPE_FLTUND; +#endif + else if (fpcsr & FPCSR_mskIVOT) + *signo = FPE_FLTINV; else if (fpcsr & FPCSR_mskDBZT) *signo = FPE_FLTDIV; else if (fpcsr & FPCSR_mskIEXT) @@ -197,11 +205,20 @@ inline void handle_fpu_exception(struct pt_regs *regs) { unsigned int fpcsr; int si_code = 0, si_signo = SIGFPE; +#if IS_ENABLED(CONFIG_SUPPORT_DENORMAL_ARITHMETIC) + unsigned long redo_except = FPCSR_mskDNIT|FPCSR_mskUDFT; +#else + unsigned long redo_except = FPCSR_mskDNIT; +#endif lose_fpu(); fpcsr = current->thread.fpu.fpcsr; - if (fpcsr & FPCSR_mskDNIT) { + if (fpcsr & redo_except) { +#if IS_ENABLED(CONFIG_SUPPORT_DENORMAL_ARITHMETIC) + if (fpcsr & FPCSR_mskUDFT) + current->thread.fpu.fpcsr &= ~FPCSR_mskIEX; +#endif si_signo = do_fpuemu(regs, ¤t->thread.fpu); fpcsr = current->thread.fpu.fpcsr; if (!si_signo) |