1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/types.h> 3 #include <linux/errno.h> 4 #include <linux/uaccess.h> 5 6 #include <asm/sfp-machine.h> 7 #include <math-emu/soft-fp.h> 8 #include <math-emu/double.h> 9 10 int 11 fsub(void *frD, void *frA, void *frB) 12 { 13 FP_DECL_D(A); 14 FP_DECL_D(B); 15 FP_DECL_D(R); 16 FP_DECL_EX; 17 18 #ifdef DEBUG 19 printk("%s: %p %p %p\n", __func__, frD, frA, frB); 20 #endif 21 22 FP_UNPACK_DP(A, frA); 23 FP_UNPACK_DP(B, frB); 24 25 #ifdef DEBUG 26 printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c); 27 printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c); 28 #endif 29 30 if (B_c != FP_CLS_NAN) 31 B_s ^= 1; 32 33 if (A_s != B_s && A_c == FP_CLS_INF && B_c == FP_CLS_INF) 34 FP_SET_EXCEPTION(EFLAG_VXISI); 35 36 FP_ADD_D(R, A, B); 37 38 #ifdef DEBUG 39 printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c); 40 #endif 41 42 __FP_PACK_D(frD, R); 43 44 return FP_CUR_EXCEPTIONS; 45 } 46