1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _SPARC64_VISASM_H 3 #define _SPARC64_VISASM_H 4 5 /* visasm.h: FPU saving macros for VIS routines 6 * 7 * Copyright (C) 1998 Jakub Jelinek (jj@ultra.linux.cz) 8 */ 9 10 #include <asm/pstate.h> 11 #include <asm/ptrace.h> 12 13 /* Clobbers %o5, %g1, %g2, %g3, %g7, %icc, %xcc */ 14 15 #define VISEntry \ 16 rd %fprs, %o5; \ 17 andcc %o5, (FPRS_FEF|FPRS_DU), %g0; \ 18 be,pt %icc, 297f; \ 19 sethi %hi(297f), %g7; \ 20 sethi %hi(VISenter), %g1; \ 21 jmpl %g1 + %lo(VISenter), %g0; \ 22 or %g7, %lo(297f), %g7; \ 23 297: wr %g0, FPRS_FEF, %fprs; \ 24 25 #define VISExit \ 26 wr %g0, 0, %fprs; 27 28 /* Clobbers %o5, %g1, %g2, %g3, %g7, %icc, %xcc. 29 * Must preserve %o5 between VISEntryHalf and VISExitHalf */ 30 31 #define VISEntryHalf \ 32 VISEntry 33 34 #define VISExitHalf \ 35 VISExit 36 37 #define VISEntryHalfFast(fail_label) \ 38 rd %fprs, %o5; \ 39 andcc %o5, FPRS_FEF, %g0; \ 40 be,pt %icc, 297f; \ 41 nop; \ 42 ba,a,pt %xcc, fail_label; \ 43 297: wr %o5, FPRS_FEF, %fprs; 44 45 #define VISExitHalfFast \ 46 wr %o5, 0, %fprs; 47 48 #ifndef __ASSEMBLY__ 49 static inline void save_and_clear_fpu(void) { 50 __asm__ __volatile__ ( 51 " rd %%fprs, %%o5\n" 52 " andcc %%o5, %0, %%g0\n" 53 " be,pt %%icc, 299f\n" 54 " sethi %%hi(298f), %%g7\n" 55 " sethi %%hi(VISenter), %%g1\n" 56 " jmpl %%g1 + %%lo(VISenter), %%g0\n" 57 " or %%g7, %%lo(298f), %%g7\n" 58 " 298: wr %%g0, 0, %%fprs\n" 59 " 299:\n" 60 " " : : "i" (FPRS_FEF|FPRS_DU) : 61 "o5", "g1", "g2", "g3", "g7", "cc"); 62 } 63 64 int vis_emul(struct pt_regs *, unsigned int); 65 #endif 66 67 #endif /* _SPARC64_ASI_H */ 68