1/* 2 * VISsave.S: Code for saving FPU register state for 3 * VIS routines. One should not call this directly, 4 * but use macros provided in <asm/visasm.h>. 5 * 6 * Copyright (C) 1998 Jakub Jelinek (jj@ultra.linux.cz) 7 */ 8 9#include <linux/linkage.h> 10 11#include <asm/asi.h> 12#include <asm/page.h> 13#include <asm/ptrace.h> 14#include <asm/visasm.h> 15#include <asm/thread_info.h> 16 17 /* On entry: %o5=current FPRS value, %g7 is callers address */ 18 /* May clobber %o5, %g1, %g2, %g3, %g7, %icc, %xcc */ 19 20 /* Nothing special need be done here to handle pre-emption, this 21 * FPU save/restore mechanism is already preemption safe. 22 */ 23 .text 24 .align 32 25ENTRY(VISenter) 26 ldub [%g6 + TI_FPDEPTH], %g1 27 brnz,a,pn %g1, 1f 28 cmp %g1, 1 29 stb %g0, [%g6 + TI_FPSAVED] 30 stx %fsr, [%g6 + TI_XFSR] 319: jmpl %g7 + %g0, %g0 32 nop 331: bne,pn %icc, 2f 34 35 srl %g1, 1, %g1 36vis1: ldub [%g6 + TI_FPSAVED], %g3 37 stx %fsr, [%g6 + TI_XFSR] 38 or %g3, %o5, %g3 39 stb %g3, [%g6 + TI_FPSAVED] 40 rd %gsr, %g3 41 clr %g1 42 ba,pt %xcc, 3f 43 44 stx %g3, [%g6 + TI_GSR] 452: add %g6, %g1, %g3 46 mov FPRS_DU | FPRS_DL | FPRS_FEF, %o5 47 sll %g1, 3, %g1 48 stb %o5, [%g3 + TI_FPSAVED] 49 rd %gsr, %g2 50 add %g6, %g1, %g3 51 stx %g2, [%g3 + TI_GSR] 52 53 add %g6, %g1, %g2 54 stx %fsr, [%g2 + TI_XFSR] 55 sll %g1, 5, %g1 563: andcc %o5, FPRS_DL|FPRS_DU, %g0 57 be,pn %icc, 9b 58 add %g6, TI_FPREGS, %g2 59 andcc %o5, FPRS_DL, %g0 60 61 be,pn %icc, 4f 62 add %g6, TI_FPREGS+0x40, %g3 63 membar #Sync 64 stda %f0, [%g2 + %g1] ASI_BLK_P 65 stda %f16, [%g3 + %g1] ASI_BLK_P 66 membar #Sync 67 andcc %o5, FPRS_DU, %g0 68 be,pn %icc, 5f 694: add %g1, 128, %g1 70 membar #Sync 71 stda %f32, [%g2 + %g1] ASI_BLK_P 72 73 stda %f48, [%g3 + %g1] ASI_BLK_P 745: membar #Sync 75 ba,pt %xcc, 80f 76 nop 77 78 .align 32 7980: jmpl %g7 + %g0, %g0 80 nop 81ENDPROC(VISenter) 82