diff options
Diffstat (limited to 'arch/nds32/include/uapi/asm')
| -rw-r--r-- | arch/nds32/include/uapi/asm/fp_udfiex_crtl.h | 16 | ||||
| -rw-r--r-- | arch/nds32/include/uapi/asm/sigcontext.h | 24 | ||||
| -rw-r--r-- | arch/nds32/include/uapi/asm/udftrap.h | 13 | ||||
| -rw-r--r-- | arch/nds32/include/uapi/asm/unistd.h | 4 |
4 files changed, 35 insertions, 22 deletions
diff --git a/arch/nds32/include/uapi/asm/fp_udfiex_crtl.h b/arch/nds32/include/uapi/asm/fp_udfiex_crtl.h new file mode 100644 index 000000000000..d54a5d6c6538 --- /dev/null +++ b/arch/nds32/include/uapi/asm/fp_udfiex_crtl.h @@ -0,0 +1,16 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) 2005-2019 Andes Technology Corporation */ +#ifndef _FP_UDF_IEX_CRTL_H +#define _FP_UDF_IEX_CRTL_H + +/* + * The cmd list of sys_fp_udfiex_crtl() + */ +/* Disable UDF or IEX trap based on the content of parameter act */ +#define DISABLE_UDF_IEX_TRAP 0 +/* Enable UDF or IEX trap based on the content of parameter act */ +#define ENABLE_UDF_IEX_TRAP 1 +/* Get current status of UDF and IEX trap */ +#define GET_UDF_IEX_TRAP 2 + +#endif /* _FP_UDF_IEX_CRTL_H */ diff --git a/arch/nds32/include/uapi/asm/sigcontext.h b/arch/nds32/include/uapi/asm/sigcontext.h index 628ff6b75825..dc89af7ddcc3 100644 --- a/arch/nds32/include/uapi/asm/sigcontext.h +++ b/arch/nds32/include/uapi/asm/sigcontext.h @@ -13,14 +13,24 @@ struct fpu_struct { unsigned long long fd_regs[32]; unsigned long fpcsr; /* - * UDF_trap is used to recognize whether underflow trap is enabled - * or not. When UDF_trap == 1, this process will be traped and then - * get a SIGFPE signal when encountering an underflow exception. - * UDF_trap is only modified through setfputrap syscall. Therefore, - * UDF_trap needn't be saved or loaded to context in each context - * switch. + * When CONFIG_SUPPORT_DENORMAL_ARITHMETIC is defined, kernel prevents + * hardware from treating the denormalized output as an underflow case + * and rounding it to a normal number. Hence kernel enables the UDF and + * IEX trap in the fpcsr register to step in the calculation. + * However, the UDF and IEX trap enable bit in $fpcsr also lose + * their use. + * + * UDF_IEX_trap replaces the feature of UDF and IEX trap enable bit in + * $fpcsr to control the trap of underflow and inexact. The bit filed + * of UDF_IEX_trap is the same as $fpcsr, 10th bit is used to enable UDF + * exception trapping and 11th bit is used to enable IEX exception + * trapping. + * + * UDF_IEX_trap is only modified through fp_udfiex_crtl syscall. + * Therefore, UDF_IEX_trap needn't be saved and restored in each + * context switch. */ - unsigned long UDF_trap; + unsigned long UDF_IEX_trap; }; struct zol_struct { diff --git a/arch/nds32/include/uapi/asm/udftrap.h b/arch/nds32/include/uapi/asm/udftrap.h deleted file mode 100644 index 433f79d679c0..000000000000 --- a/arch/nds32/include/uapi/asm/udftrap.h +++ /dev/null @@ -1,13 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -/* Copyright (C) 2005-2018 Andes Technology Corporation */ -#ifndef _ASM_SETFPUTRAP -#define _ASM_SETFPUTRAP - -/* - * Options for setfputrap system call - */ -#define DISABLE_UDFTRAP 0 /* disable underflow exception trap */ -#define ENABLE_UDFTRAP 1 /* enable undeflos exception trap */ -#define GET_UDFTRAP 2 /* only get undeflos exception trap status */ - -#endif /* _ASM_CACHECTL */ diff --git a/arch/nds32/include/uapi/asm/unistd.h b/arch/nds32/include/uapi/asm/unistd.h index c691735017ed..a0b2f7b9c0f2 100644 --- a/arch/nds32/include/uapi/asm/unistd.h +++ b/arch/nds32/include/uapi/asm/unistd.h @@ -11,6 +11,6 @@ /* Additional NDS32 specific syscalls. */ #define __NR_cacheflush (__NR_arch_specific_syscall) -#define __NR_udftrap (__NR_arch_specific_syscall + 1) +#define __NR_fp_udfiex_crtl (__NR_arch_specific_syscall + 1) __SYSCALL(__NR_cacheflush, sys_cacheflush) -__SYSCALL(__NR_udftrap, sys_udftrap) +__SYSCALL(__NR_fp_udfiex_crtl, sys_fp_udfiex_crtl) |
