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#
# 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.
#
#include <arch/register.h>
.text
/** Copy memory from/to userspace.
*
* This memcpy() has been taken from the assembler output of
* the generic _memcpy() and modified to have the failover part.
*
* @param in0 Destination address.
* @param in1 Source address.
* @param in2 Number of byte to copy.
*/
.global memcpy
.global memcpy_from_uspace
.global memcpy_to_uspace
.global memcpy_from_uspace_failover_address
.global memcpy_to_uspace_failover_address
memcpy:
memcpy_from_uspace:
memcpy_to_uspace:
alloc loc0 = ar.pfs, 3, 1, 0, 0
adds r14 = 7, in1
mov r2 = ar.lc
mov r8 = in1 ;;
and r14 = -8, r14 ;;
cmp.ne p6, p7 = r14, in1
(p7) br.cond.dpnt 3f ;;
0:
cmp.ne p6, p7 = 0, in2
(p7) br.cond.dpnt 2f ;;
(p6) adds r14 = -1, in2
(p6) mov r16 = r0
(p6) mov r17 = r0 ;;
(p6) mov ar.lc = r14
1:
add r14 = r16, r8
add r15 = r16, in0
adds r17 = 1, r17 ;;
ld1 r14 = [r14]
mov r16 = r17 ;;
st1 [r15] = r14
br.cloop.sptk.few 1b ;;
2:
mov ar.lc = r2
mov ar.pfs = loc0
br.ret.sptk.many rp
3:
adds r14 = 7, in0 ;;
and r14 = -8, r14 ;;
cmp.eq p6, p7 = r14, in0
(p7) br.cond.dptk 0b
shr.u r18 = in2, 3 ;;
cmp.ne p6, p7 = 0, r18
(p7) br.cond.dpnt 5f ;;
(p6) adds r14 = -1, r18
(p6) mov r16 = r0
(p6) mov r17 = r0 ;;
(p6) mov ar.lc = r14
4:
shladd r14 = r16, 3, r0
adds r16 = 1, r17 ;;
add r15 = r8, r14
add r14 = in0, r14
mov r17 = r16 ;;
ld8 r15 = [r15] ;;
st8 [r14] = r15
br.cloop.sptk.few 4b
5:
and r15 = 7, in2
shladd r14 = r18, 3, r0
mov r16 = r0
mov r18 = r0 ;;
cmp.eq p6, p7 = 0, r15
add in0 = r14, in0
adds r15 = -1, r15
add r17 = r14, r8
(p6) br.cond.dpnt 2b ;;
mov ar.lc = r15
6:
add r14 = r16, r17
add r15 = r16, in0
adds r16 = 1, r18 ;;
ld1 r14 = [r14]
mov r18 = r16 ;;
st1 [r15] = r14
br.cloop.sptk.few 6b ;;
mov ar.lc = r2
mov ar.pfs = loc0
br.ret.sptk.many rp
memcpy_from_uspace_failover_address:
memcpy_to_uspace_failover_address:
mov r8 = r0 /* return 0 on failure */
mov ar.pfs = loc0
br.ret.sptk.many rp
.global memsetb
memsetb:
br _memsetb
.global cpu_halt
cpu_halt:
br cpu_halt
.global panic_printf
panic_printf:
{
br.call.sptk.many b0=printf
}
br halt
/** Switch to userspace - low level code.
*
* @param in0 Userspace entry point address.
* @param in1 Userspace stack pointer address.
* @param in2 Userspace register stack pointer address.
* @param in3 Userspace address of thread uspace_arg_t structure.
* @param in4 Value to be stored in IPSR.
* @param in5 Value to be stored in RSC.
*/
.global switch_to_userspace
switch_to_userspace:
alloc loc0 = ar.pfs, 6, 3, 0, 0
rsm (PSR_IC_MASK | PSR_I_MASK) /* disable interruption collection and interrupts */
srlz.d ;;
srlz.i ;;
mov cr.ipsr = in4
mov cr.iip = in0
mov r12 = in1
xor r1 = r1, r1
mov loc1 = cr.ifs
movl loc2 = PFM_MASK ;;
and loc1 = loc2, loc1 ;;
mov cr.ifs = loc1 ;; /* prevent decrementing BSP by rfi */
invala
mov loc1 = ar.rsc ;;
and loc1 = ~3, loc1 ;;
mov ar.rsc = loc1 ;; /* put RSE into enforced lazy mode */
flushrs ;;
mov ar.bspstore = in2 ;;
mov ar.rsc = in5 ;;
mov r8 = in3
rfi ;;
Generated by GNU Enscript 1.6.6.