diff options
Diffstat (limited to 'arch/nds32/kernel/sys_nds32.c')
| -rw-r--r-- | arch/nds32/kernel/sys_nds32.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/nds32/kernel/sys_nds32.c b/arch/nds32/kernel/sys_nds32.c index 9de93ab4c52b..0835277636ce 100644 --- a/arch/nds32/kernel/sys_nds32.c +++ b/arch/nds32/kernel/sys_nds32.c @@ -6,6 +6,8 @@ #include <asm/cachectl.h> #include <asm/proc-fns.h> +#include <asm/udftrap.h> +#include <asm/fpu.h> SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len, unsigned long, prot, unsigned long, flags, @@ -48,3 +50,33 @@ SYSCALL_DEFINE3(cacheflush, unsigned int, start, unsigned int, end, int, cache) return 0; } + +SYSCALL_DEFINE1(udftrap, int, option) +{ +#if IS_ENABLED(CONFIG_SUPPORT_DENORMAL_ARITHMETIC) + int old_udftrap; + + if (!used_math()) { + load_fpu(&init_fpuregs); + current->thread.fpu.UDF_trap = init_fpuregs.UDF_trap; + set_used_math(); + } + + old_udftrap = current->thread.fpu.UDF_trap; + switch (option) { + case DISABLE_UDFTRAP: + current->thread.fpu.UDF_trap = 0; + break; + case ENABLE_UDFTRAP: + current->thread.fpu.UDF_trap = FPCSR_mskUDFE; + break; + case GET_UDFTRAP: + break; + default: + return -EINVAL; + } + return old_udftrap; +#else + return -ENOTSUPP; +#endif +} |