diff options
| author | Vincent Chen <vincentc@andestech.com> | 2019-05-20 04:21:12 +0300 |
|---|---|---|
| committer | Greentime Hu <greentime@andestech.com> | 2019-05-31 10:23:26 +0300 |
| commit | ed32949e0acb73e7bc054bb02e0453d4d561ceda (patch) | |
| tree | f582241cdd3450e01fe6d1cf508a3e3a8211c675 /arch/nds32/include/asm | |
| parent | 8183db10db6377ac58ad048a4c827425a614695c (diff) | |
| download | linux-ed32949e0acb73e7bc054bb02e0453d4d561ceda.tar.xz | |
nds32: Avoid IEX status being incorrectly modified
In order for kernel to capture each denormalized output, the UDF
trapping enable bit is always raised in $fpcsr. Because underflow case will
issue not an underflow exception but also an inexact exception, it causes
that the IEX, IEX cumulative exception, flag in $fpcsr to be raised in each
denormalized output handling. To make the emulation transparent to the
user, the emulator needs to clear the IEX flag in $fpcsr if the result is a
denormalized number. However, if the IEX flag has been raised before this
floating point emulation, this cleanup may be incorrect. To avoid the IEX
flags in $fpcsr be raised in each denormalized output handling, the IEX
trap shall be always enabled.
Signed-off-by: Vincent Chen <vincentc@andestech.com>
Acked-by: Greentime Hu <greentime@andestech.com>
Signed-off-by: Greentime Hu <greentime@andestech.com>
Diffstat (limited to 'arch/nds32/include/asm')
| -rw-r--r-- | arch/nds32/include/asm/bitfield.h | 2 | ||||
| -rw-r--r-- | arch/nds32/include/asm/fpu.h | 2 | ||||
| -rw-r--r-- | arch/nds32/include/asm/syscalls.h | 2 |
3 files changed, 3 insertions, 3 deletions
diff --git a/arch/nds32/include/asm/bitfield.h b/arch/nds32/include/asm/bitfield.h index e75212c76b20..b02a58e71f80 100644 --- a/arch/nds32/include/asm/bitfield.h +++ b/arch/nds32/include/asm/bitfield.h @@ -937,7 +937,7 @@ #define FPCSR_mskDNIT ( 0x1 << FPCSR_offDNIT ) #define FPCSR_mskRIT ( 0x1 << FPCSR_offRIT ) #define FPCSR_mskALL (FPCSR_mskIVO | FPCSR_mskDBZ | FPCSR_mskOVF | FPCSR_mskUDF | FPCSR_mskIEX) -#define FPCSR_mskALLE_NO_UDFE (FPCSR_mskIVOE | FPCSR_mskDBZE | FPCSR_mskOVFE | FPCSR_mskIEXE) +#define FPCSR_mskALLE_NO_UDF_IEXE (FPCSR_mskIVOE | FPCSR_mskDBZE | FPCSR_mskOVFE) #define FPCSR_mskALLE (FPCSR_mskIVOE | FPCSR_mskDBZE | FPCSR_mskOVFE | FPCSR_mskUDFE | FPCSR_mskIEXE) #define FPCSR_mskALLT (FPCSR_mskIVOT | FPCSR_mskDBZT | FPCSR_mskOVFT | FPCSR_mskUDFT | FPCSR_mskIEXT |FPCSR_mskDNIT | FPCSR_mskRIT) diff --git a/arch/nds32/include/asm/fpu.h b/arch/nds32/include/asm/fpu.h index 019f1bcfc5ee..8294ed4aaa2c 100644 --- a/arch/nds32/include/asm/fpu.h +++ b/arch/nds32/include/asm/fpu.h @@ -36,7 +36,7 @@ extern int do_fpuemu(struct pt_regs *regs, struct fpu_struct *fpu); * enabled by default and kerenl will re-execute it by fpu emulator * when getting underflow exception. */ -#define FPCSR_INIT FPCSR_mskUDFE +#define FPCSR_INIT (FPCSR_mskUDFE | FPCSR_mskIEXE) #else #define FPCSR_INIT 0x0UL #endif diff --git a/arch/nds32/include/asm/syscalls.h b/arch/nds32/include/asm/syscalls.h index f3b16f602cb5..4e7216082a67 100644 --- a/arch/nds32/include/asm/syscalls.h +++ b/arch/nds32/include/asm/syscalls.h @@ -7,7 +7,7 @@ asmlinkage long sys_cacheflush(unsigned long addr, unsigned long len, unsigned int op); asmlinkage long sys_fadvise64_64_wrapper(int fd, int advice, loff_t offset, loff_t len); asmlinkage long sys_rt_sigreturn_wrapper(void); -asmlinkage long sys_udftrap(int option); +asmlinkage long sys_fp_udfiex_crtl(int cmd, int act); #include <asm-generic/syscalls.h> |