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