| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * VISsave.S: Code for saving FPU register state for |
| * VIS routines. One should not call this directly, |
| * but use macros provided in <asm/visasm.h>. |
| * |
| * Copyright (C) 1998 Jakub Jelinek (jj@ultra.linux.cz) |
| */ |
| |
| #include <linux/export.h> |
| #include <linux/linkage.h> |
| |
| #include <asm/asi.h> |
| #include <asm/page.h> |
| #include <asm/ptrace.h> |
| #include <asm/visasm.h> |
| #include <asm/thread_info.h> |
| |
| /* On entry: %o5=current FPRS value, %g7 is callers address */ |
| /* May clobber %o5, %g1, %g2, %g3, %g7, %icc, %xcc */ |
| |
| /* Nothing special need be done here to handle pre-emption, this |
| * FPU save/restore mechanism is already preemption safe. |
| */ |
| .text |
| .align 32 |
| ENTRY(VISenter) |
| ldub [%g6 + TI_FPDEPTH], %g1 |
| brnz,a,pn %g1, 1f |
| cmp %g1, 1 |
| stb %g0, [%g6 + TI_FPSAVED] |
| stx %fsr, [%g6 + TI_XFSR] |
| 9: jmpl %g7 + %g0, %g0 |
| nop |
| 1: bne,pn %icc, 2f |
| |
| srl %g1, 1, %g1 |
| vis1: ldub [%g6 + TI_FPSAVED], %g3 |
| stx %fsr, [%g6 + TI_XFSR] |
| or %g3, %o5, %g3 |
| stb %g3, [%g6 + TI_FPSAVED] |
| rd %gsr, %g3 |
| clr %g1 |
| ba,pt %xcc, 3f |
| |
| stx %g3, [%g6 + TI_GSR] |
| 2: add %g6, %g1, %g3 |
| mov FPRS_DU | FPRS_DL | FPRS_FEF, %o5 |
| sll %g1, 3, %g1 |
| stb %o5, [%g3 + TI_FPSAVED] |
| rd %gsr, %g2 |
| add %g6, %g1, %g3 |
| stx %g2, [%g3 + TI_GSR] |
| |
| add %g6, %g1, %g2 |
| stx %fsr, [%g2 + TI_XFSR] |
| sll %g1, 5, %g1 |
| 3: andcc %o5, FPRS_DL|FPRS_DU, %g0 |
| be,pn %icc, 9b |
| add %g6, TI_FPREGS, %g2 |
| andcc %o5, FPRS_DL, %g0 |
| |
| be,pn %icc, 4f |
| add %g6, TI_FPREGS+0x40, %g3 |
| membar #Sync |
| stda %f0, [%g2 + %g1] ASI_BLK_P |
| stda %f16, [%g3 + %g1] ASI_BLK_P |
| membar #Sync |
| andcc %o5, FPRS_DU, %g0 |
| be,pn %icc, 5f |
| 4: add %g1, 128, %g1 |
| membar #Sync |
| stda %f32, [%g2 + %g1] ASI_BLK_P |
| |
| stda %f48, [%g3 + %g1] ASI_BLK_P |
| 5: membar #Sync |
| ba,pt %xcc, 80f |
| nop |
| |
| .align 32 |
| 80: jmpl %g7 + %g0, %g0 |
| nop |
| ENDPROC(VISenter) |
| EXPORT_SYMBOL(VISenter) |
