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426 jermar 1
#
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# Copyright (c) 2005 Jakub Jermar
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# - Redistributions of source code must retain the above copyright
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#   notice, this list of conditions and the following disclaimer.
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# - Redistributions in binary form must reproduce the above copyright
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#   notice, this list of conditions and the following disclaimer in the
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#   documentation and/or other materials provided with the distribution.
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# - The name of the author may not be used to endorse or promote products
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#   derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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#include <arch/arch.h>
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#include <arch/stack.h>
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#include <arch/regdef.h>
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#include <arch/mm/mmu.h>
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.text
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.register       %g2, #scratch
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.register       %g3, #scratch
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/*
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 * This is the assembly language version of our _memcpy() generated by gcc.
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 */
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.global memcpy
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memcpy:
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	add	%o1, 7, %g1
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	and	%g1, -8, %g1
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	cmp	%o1, %g1
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	be,pn	%xcc, 3f
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	add	%o0, 7, %g1
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	mov	0, %g3
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0:
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	brz,pn	%o2, 2f
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	mov	0, %g2
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1:
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	ldub	[%g3 + %o1], %g1
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	add	%g2, 1, %g2
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	cmp	%o2, %g2
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	stb	%g1, [%g3 + %o0]
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	bne,pt	%xcc, 1b
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	mov	%g2, %g3
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2:
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	jmp	%o7 + 8			! exit point
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	mov	%o1, %o0
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3:
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	and	%g1, -8, %g1
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	cmp	%o0, %g1
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	bne,pt	%xcc, 0b
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	mov	0, %g3
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	srlx	%o2, 3, %g4
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	brz,pn	%g4, 5f
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	mov	0, %g5
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4:
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	sllx	%g3, 3, %g2
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	add	%g5, 1, %g3
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	ldx	[%o1 + %g2], %g1
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	mov	%g3, %g5
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	cmp	%g4, %g3
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	bne,pt	%xcc, 4b
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	stx	%g1, [%o0 + %g2]
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5:
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	and	%o2, 7, %o2
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	brz,pn	%o2, 2b
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	sllx	%g4, 3, %g1
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	mov	0, %g2
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	add	%g1, %o0, %o0
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	add	%g1, %o1, %g4
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	mov	0, %g3
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6:
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	ldub	[%g2 + %g4], %g1
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	stb	%g1, [%g2 + %o0]
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	add	%g3, 1, %g2
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	cmp	%o2, %g2
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	bne,pt	%xcc, 6b
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	mov	%g2, %g3
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	jmp	%o7 + 8			! exit point
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	mov	%o1, %o0
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/*
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 * Almost the same as memcpy() except the loads are from userspace.
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 */
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.global memcpy_from_uspace
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memcpy_from_uspace:
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	add	%o1, 7, %g1
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	and	%g1, -8, %g1
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	cmp	%o1, %g1
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	be,pn	%xcc, 3f
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	add	%o0, 7, %g1
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	mov	0, %g3
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0:
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	brz,pn	%o2, 2f
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	mov	0, %g2
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1:
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	lduba	[%g3 + %o1] ASI_AIUS, %g1
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	add	%g2, 1, %g2
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	cmp	%o2, %g2
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	stb	%g1, [%g3 + %o0]
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	bne,pt	%xcc, 1b
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	mov	%g2, %g3
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2:
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	jmp	%o7 + 8			! exit point
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	mov	%o1, %o0
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3:
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	and	%g1, -8, %g1
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	cmp	%o0, %g1
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	bne,pt	%xcc, 0b
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	mov	0, %g3
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	srlx	%o2, 3, %g4
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	brz,pn	%g4, 5f
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	mov	0, %g5
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4:
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	sllx	%g3, 3, %g2
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	add	%g5, 1, %g3
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	ldxa	[%o1 + %g2] ASI_AIUS, %g1
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	mov	%g3, %g5
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	cmp	%g4, %g3
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	bne,pt	%xcc, 4b
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	stx	%g1, [%o0 + %g2]
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5:
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	and	%o2, 7, %o2
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	brz,pn	%o2, 2b
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	sllx	%g4, 3, %g1
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	mov	0, %g2
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	add	%g1, %o0, %o0
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	add	%g1, %o1, %g4
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	mov	0, %g3
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6:
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	lduba	[%g2 + %g4] ASI_AIUS, %g1
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	stb	%g1, [%g2 + %o0]
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	add	%g3, 1, %g2
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	cmp	%o2, %g2
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	bne,pt	%xcc, 6b
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	mov	%g2, %g3
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154
	jmp	%o7 + 8			! exit point
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	mov	%o1, %o0
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157
/*
158
 * Almost the same as memcpy() except the stores are to userspace.
159
 */
160
.global memcpy_to_uspace
161
memcpy_to_uspace:
162
	add	%o1, 7, %g1
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	and	%g1, -8, %g1
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	cmp	%o1, %g1
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	be,pn	%xcc, 3f
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	add	%o0, 7, %g1
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	mov	0, %g3
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0:
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	brz,pn	%o2, 2f
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	mov	0, %g2
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1:
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	ldub	[%g3 + %o1], %g1
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	add	%g2, 1, %g2
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	cmp	%o2, %g2
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	stba	%g1, [%g3 + %o0] ASI_AIUS
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	bne,pt	%xcc, 1b
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	mov	%g2, %g3
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2:
179
	jmp	%o7 + 8			! exit point
180
	mov	%o1, %o0
181
3:
182
	and	%g1, -8, %g1
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	cmp	%o0, %g1
184
	bne,pt	%xcc, 0b
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	mov	0, %g3
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	srlx	%o2, 3, %g4
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	brz,pn	%g4, 5f
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	mov	0, %g5
189
4:
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	sllx	%g3, 3, %g2
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	add	%g5, 1, %g3
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	ldx	[%o1 + %g2], %g1
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	mov	%g3, %g5
194
	cmp	%g4, %g3
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	bne,pt	%xcc, 4b
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	stxa	%g1, [%o0 + %g2] ASI_AIUS
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5:
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	and	%o2, 7, %o2
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	brz,pn	%o2, 2b
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	sllx	%g4, 3, %g1
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	mov	0, %g2
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	add	%g1, %o0, %o0
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	add	%g1, %o1, %g4
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	mov	0, %g3
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6:
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	ldub	[%g2 + %g4], %g1
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	stba	%g1, [%g2 + %o0] ASI_AIUS
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	add	%g3, 1, %g2
209
	cmp	%o2, %g2
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	bne,pt	%xcc, 6b
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	mov	%g2, %g3
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213
	jmp	%o7 + 8			! exit point
214
	mov	%o1, %o0
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216
.global memcpy_from_uspace_failover_address
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.global memcpy_to_uspace_failover_address
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memcpy_from_uspace_failover_address:
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memcpy_to_uspace_failover_address:
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	jmp	%o7 + 8			! exit point
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	mov	%g0, %o0		! return 0 on failure
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.global memsetb
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memsetb:
225
	b _memsetb
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	nop
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228
 
229
.macro WRITE_ALTERNATE_REGISTER reg, bit
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	rdpr %pstate, %g1				! save PSTATE.PEF
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	wrpr %g0, (\bit | PSTATE_PRIV_BIT), %pstate
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	mov %o0, \reg
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	wrpr %g0, PSTATE_PRIV_BIT, %pstate
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	retl
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	wrpr %g1, 0, %pstate				! restore PSTATE.PEF
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.endm
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.macro READ_ALTERNATE_REGISTER reg, bit
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	rdpr %pstate, %g1				! save PSTATE.PEF
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	wrpr %g0, (\bit | PSTATE_PRIV_BIT), %pstate
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	mov \reg, %o0
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	wrpr %g0, PSTATE_PRIV_BIT, %pstate
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	retl
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	wrpr %g1, 0, %pstate				! restore PSTATE.PEF
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.endm
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247
.global write_to_ag_g6
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write_to_ag_g6:
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	WRITE_ALTERNATE_REGISTER %g6, PSTATE_AG_BIT
250
 
251
.global write_to_ag_g7
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write_to_ag_g7:
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	WRITE_ALTERNATE_REGISTER %g7, PSTATE_AG_BIT
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255
.global write_to_ig_g6
256
write_to_ig_g6:
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	WRITE_ALTERNATE_REGISTER %g6, PSTATE_IG_BIT
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259
.global read_from_ag_g7
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read_from_ag_g7:
261
	READ_ALTERNATE_REGISTER %g7, PSTATE_AG_BIT
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263
 
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/** Switch to userspace.
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 *
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 * %o0	Userspace entry address.
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 * %o1	Userspace stack pointer address.
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 * %o2  Userspace address of uarg structure.
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 */
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.global switch_to_userspace
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switch_to_userspace:
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	save %o1, -STACK_WINDOW_SAVE_AREA_SIZE, %sp
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	flushw
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	wrpr %g0, 0, %cleanwin		! avoid information leak
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	mov %i2, %o0			! uarg
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	xor %o1, %o1, %o1		! %o1 is defined to hold pcb_ptr
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					! set it to 0
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1860 jermar 280
	clr %i2
281
	clr %i3
282
	clr %i4
283
	clr %i5
284
	clr %i6
285
 
286
	wrpr %g0, 1, %tl		! enforce mapping via nucleus
287
 
288
	rdpr %cwp, %g1
289
	wrpr %g1, TSTATE_IE_BIT, %tstate
290
	wrpr %i0, 0, %tnpc
291
 
292
	/*
293
	 * Set primary context according to secondary context.
294
	 * Secondary context has been already installed by
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	 * higher-level functions.
296
	 */
297
	wr %g0, ASI_DMMU, %asi
298
	ldxa [VA_SECONDARY_CONTEXT_REG] %asi, %g1
299
	stxa %g1, [VA_PRIMARY_CONTEXT_REG] %asi
300
	flush %i7
1864 jermar 301
 
302
	/*
303
	 * Spills and fills will be handled by the userspace handlers.
304
	 */
305
	wrpr %g0, WSTATE_OTHER(0) | WSTATE_NORMAL(1), %wstate
1860 jermar 306
 
307
	done				! jump to userspace
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