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-rw-r--r--arch/sparc/lib/VISsave.S144
1 files changed, 144 insertions, 0 deletions
diff --git a/arch/sparc/lib/VISsave.S b/arch/sparc/lib/VISsave.S
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index 00000000000..b320ae9e2e2
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+++ b/arch/sparc/lib/VISsave.S
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+/*
+ * 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 <asm/asi.h>
+#include <asm/page.h>
+#include <asm/ptrace.h>
+#include <asm/visasm.h>
+#include <asm/thread_info.h>
+
+ .text
+ .globl VISenter, VISenterhalf
+
+ /* 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.
+ */
+
+ .align 32
+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
+ cmp %o5, FPRS_DU
+ be,pn %icc, 6f
+ 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
+
+6: ldub [%g3 + TI_FPSAVED], %o5
+ or %o5, FPRS_DU, %o5
+ add %g6, TI_FPREGS+0x80, %g2
+ stb %o5, [%g3 + TI_FPSAVED]
+
+ sll %g1, 5, %g1
+ add %g6, TI_FPREGS+0xc0, %g3
+ wr %g0, FPRS_FEF, %fprs
+ membar #Sync
+ stda %f32, [%g2 + %g1] ASI_BLK_P
+ stda %f48, [%g3 + %g1] ASI_BLK_P
+ membar #Sync
+ ba,pt %xcc, 80f
+ nop
+
+ .align 32
+80: jmpl %g7 + %g0, %g0
+ nop
+
+ .align 32
+VISenterhalf:
+ ldub [%g6 + TI_FPDEPTH], %g1
+ brnz,a,pn %g1, 1f
+ cmp %g1, 1
+ stb %g0, [%g6 + TI_FPSAVED]
+ stx %fsr, [%g6 + TI_XFSR]
+ clr %o5
+ jmpl %g7 + %g0, %g0
+ wr %g0, FPRS_FEF, %fprs
+
+1: bne,pn %icc, 2f
+ srl %g1, 1, %g1
+ ba,pt %xcc, vis1
+ sub %g7, 8, %g7
+2: addcc %g6, %g1, %g3
+ sll %g1, 3, %g1
+ andn %o5, FPRS_DU, %g2
+ stb %g2, [%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, %g0
+ be,pn %icc, 4f
+ add %g6, TI_FPREGS, %g2
+
+ add %g6, TI_FPREGS+0x40, %g3
+ membar #Sync
+ stda %f0, [%g2 + %g1] ASI_BLK_P
+ stda %f16, [%g3 + %g1] ASI_BLK_P
+ membar #Sync
+ ba,pt %xcc, 4f
+ nop
+
+ .align 32
+4: and %o5, FPRS_DU, %o5
+ jmpl %g7 + %g0, %g0
+ wr %o5, FPRS_FEF, %fprs