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110 lines
2.0 KiB
110 lines
2.0 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* copy_in_user.S: Copy from userspace to userspace. |
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* |
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* Copyright (C) 1999, 2000, 2004 David S. Miller (davem@redhat.com) |
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*/ |
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#include <linux/linkage.h> |
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#include <asm/asi.h> |
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#include <asm/export.h> |
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#define XCC xcc |
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#define EX(x,y,z) \ |
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98: x,y; \ |
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.section __ex_table,"a";\ |
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.align 4; \ |
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.word 98b, z; \ |
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.text; \ |
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.align 4; |
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#define EX_O4(x,y) EX(x,y,__retl_o4_plus_8) |
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#define EX_O2_4(x,y) EX(x,y,__retl_o2_plus_4) |
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#define EX_O2_1(x,y) EX(x,y,__retl_o2_plus_1) |
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.register %g2,#scratch |
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.register %g3,#scratch |
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.text |
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__retl_o4_plus_8: |
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add %o4, %o2, %o4 |
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retl |
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add %o4, 8, %o0 |
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__retl_o2_plus_4: |
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retl |
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add %o2, 4, %o0 |
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__retl_o2_plus_1: |
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retl |
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add %o2, 1, %o0 |
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.align 32 |
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/* Don't try to get too fancy here, just nice and |
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* simple. This is predominantly used for well aligned |
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* small copies in the compat layer. It is also used |
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* to copy register windows around during thread cloning. |
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*/ |
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ENTRY(raw_copy_in_user) /* %o0=dst, %o1=src, %o2=len */ |
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cmp %o2, 0 |
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be,pn %XCC, 85f |
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or %o0, %o1, %o3 |
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cmp %o2, 16 |
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bleu,a,pn %XCC, 80f |
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or %o3, %o2, %o3 |
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/* 16 < len <= 64 */ |
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andcc %o3, 0x7, %g0 |
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bne,pn %XCC, 90f |
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nop |
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andn %o2, 0x7, %o4 |
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and %o2, 0x7, %o2 |
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1: subcc %o4, 0x8, %o4 |
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EX_O4(ldxa [%o1] %asi, %o5) |
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EX_O4(stxa %o5, [%o0] %asi) |
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add %o1, 0x8, %o1 |
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bgu,pt %XCC, 1b |
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add %o0, 0x8, %o0 |
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andcc %o2, 0x4, %g0 |
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be,pt %XCC, 1f |
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nop |
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sub %o2, 0x4, %o2 |
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EX_O2_4(lduwa [%o1] %asi, %o5) |
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EX_O2_4(stwa %o5, [%o0] %asi) |
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add %o1, 0x4, %o1 |
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add %o0, 0x4, %o0 |
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1: cmp %o2, 0 |
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be,pt %XCC, 85f |
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nop |
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ba,pt %xcc, 90f |
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nop |
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80: /* 0 < len <= 16 */ |
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andcc %o3, 0x3, %g0 |
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bne,pn %XCC, 90f |
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nop |
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82: |
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subcc %o2, 4, %o2 |
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EX_O2_4(lduwa [%o1] %asi, %g1) |
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EX_O2_4(stwa %g1, [%o0] %asi) |
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add %o1, 4, %o1 |
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bgu,pt %XCC, 82b |
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add %o0, 4, %o0 |
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85: retl |
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clr %o0 |
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.align 32 |
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90: |
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subcc %o2, 1, %o2 |
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EX_O2_1(lduba [%o1] %asi, %g1) |
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EX_O2_1(stba %g1, [%o0] %asi) |
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add %o1, 1, %o1 |
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bgu,pt %XCC, 90b |
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add %o0, 1, %o0 |
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retl |
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clr %o0 |
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ENDPROC(raw_copy_in_user) |
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EXPORT_SYMBOL(raw_copy_in_user)
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