/* FPU control word bits. C-SKY version. Copyright (C) 2018-2021 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library. If not, see . */ #ifndef _FPU_CONTROL_H #define _FPU_CONTROL_H /* C-SKY FPU floating point control register bits. 31-28 -> Reserved (read as 0, write with 0). 27 -> 0: Flush denormalized results to zero. 1: Flush denormalized results to signed minimal normal number. 26 -> Reserved (read as 0, write with 0). 25-24 -> Rounding control. 23-6 -> Reserved (read as 0, write with 0). 5 -> Enable exception for input denormalized exception. 4 -> Enable exception for inexact exception. 3 -> Enable exception for underflow exception. 2 -> Enable exception for overflow exception. 1 -> Enable exception for division by zero exception. 0 -> Enable exception for invalid operation exception. Rounding Control: 00 - Rounding to nearest (RN). 01 - Rounding toward zero (RZ). 10 - Rounding (up) toward plus infinity (RP). 11 - Rounding (down)toward minus infinity (RM). C-SKY FPU floating point exception status register bits. 15 -> Accumulate bit for any exception. 14 -> Reserved (read as 0, write with 0). 13 -> Cause bit for input denormalized exception. 12 -> Cause bit for inexact exception. 11 -> Cause bit for underflow exception. 10 -> Cause bit for overflow exception. 9 -> Cause bit for division by zero exception. 8 -> Cause bit for invalid operation exception. 7 -> Flag bit for any exception. 6 -> Reserved (read as 0, write with 0). 5 -> Flag exception for input denormalized exception. 4 -> Flag exception for inexact exception. 3 -> Flag exception for underflow exception. 2 -> Flag exception for overflow exception. 1 -> Flag exception for division by zero exception. 0 -> Flag exception for invalid operation exception. */ #include #ifdef __csky_soft_float__ # define _FPU_RESERVED 0xffffffff # define _FPU_DEFAULT 0x00000000 typedef unsigned int fpu_control_t; # define _FPU_GETCW(cw) (cw) = 0 # define _FPU_SETCW(cw) (void) (cw) # define _FPU_GETFPSR(cw) (cw) = 0 # define _FPU_SETFPSR(cw) (void) (cw) extern fpu_control_t __fpu_control; #else /* __csky_soft_float__ */ /* Masking of interrupts. */ # define _FPU_MASK_IDE (1 << 5) /* Input denormalized exception. */ # define _FPU_MASK_IXE (1 << 4) /* Inexact exception. */ # define _FPU_MASK_UFE (1 << 3) /* Underflow exception. */ # define _FPU_MASK_OFE (1 << 2) /* Overflow exception. */ # define _FPU_MASK_DZE (1 << 1) /* Division by zero exception. */ # define _FPU_MASK_IOE (1 << 0) /* Invalid operation exception. */ # define _FPU_MASK_FEA (1 << 15) /* Case for any exception. */ # define _FPU_MASK_FEC (1 << 7) /* Flag for any exception. */ /* Flush denormalized numbers to zero. */ # define _FPU_FLUSH_TZ 0x8000000 /* Rounding control. */ # define _FPU_RC_NEAREST (0x0 << 24) /* RECOMMENDED. */ # define _FPU_RC_ZERO (0x1 << 24) # define _FPU_RC_UP (0x2 << 24) # define _FPU_RC_DOWN (0x3 << 24) # define _FPU_RESERVED 0xf460ffc0 /* Reserved bits in cw. */ # define _FPU_FPSR_RESERVED 0xffff4040 /* The fdlibm code requires strict IEEE double precision arithmetic, and no interrupts for exceptions, rounding to nearest. */ # define _FPU_DEFAULT 0x00000000 # define _FPU_FPSR_DEFAULT 0x00000000 /* IEEE: same as above, but exceptions. */ # define _FPU_FPCR_IEEE 0x0000001F # define _FPU_FPSR_IEEE 0x00000000 /* Type of the control word. */ typedef unsigned int fpu_control_t; /* Macros for accessing the hardware control word. */ # if (__CSKY__ == 2) # define _FPU_GETCW(cw) __asm__ volatile ("mfcr %0, cr<1, 2>" : "=a" (cw)) # define _FPU_SETCW(cw) __asm__ volatile ("mtcr %0, cr<1, 2>" : : "a" (cw)) # define _FPU_GETFPSR(cw) __asm__ volatile ("mfcr %0, cr<2, 2>" : "=a" (cw)) # define _FPU_SETFPSR(cw) __asm__ volatile ("mtcr %0, cr<2, 2>" : : "a" (cw)) # else # define _FPU_GETCW(cw) __asm__ volatile ("1: cprcr %0, cpcr2 \n" \ " btsti %0, 31 \n" \ " bt 1b \n" \ " cprcr %0, cpcr1\n" : "=b" (cw)) # define _FPU_SETCW(cw) __asm__ volatile ("1: cprcr r7, cpcr2 \n" \ " btsti r7, 31 \n" \ " bt 1b \n" \ " cpwcr %0, cpcr1 \n" \ : : "b" (cw) : "r7") # define _FPU_GETFPSR(cw) __asm__ volatile ("1: cprcr %0, cpcr2 \n" \ " btsti %0, 31 \n" \ " bt 1b \n" \ " cprcr %0, cpcr4\n" : "=b" (cw)) # define _FPU_SETFPSR(cw) __asm__ volatile ("1: cprcr r7, cpcr2 \n" \ " btsti r7, 31 \n" \ " bt 1b \n" \ " cpwcr %0, cpcr4 \n" \ : : "b" (cw) : "r7") # endif /* __CSKY__ != 2 */ /* Default control word set at startup. */ extern fpu_control_t __fpu_control; #endif /* !__csky_soft_float__ */ #endif /* fpu_control.h */