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/* apply-hack.ppc.s
;
; Copyright (c) 2007, Felix L. Winkelmann
; Copyright (c) 2008, The Chicken Team
; 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.
; Neither the name of the author nor the names of its contributors may be used to endorse or promote
; products derived from this software without specific prior written permission.
;
; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDERS OR
; CONTRIBUTORS 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.
*/
.text
.globl _C_do_apply_hack
.align 2
_C_do_apply_hack:
mr %r13, %r3 /* r13=proc */
mr %r14, %r4 /* r14=buf */
mr %r15, %r5 /* r15=count */
li %r16, 8 /* Assume count >= 8 */
cmpwi %r15, 8
bge l1
li %r3, 8 /* offset is (8 - count) * 4 */
mr %r16, %r15 /* Remember count */
sub %r15, %r3, %r15
slwi %r15, %r15, 2
bl l2 /* compute branch address */
l2: mflr %r4
add %r15, %r4, %r15
addi %r15, %r15, (l1 - l2)@l
mtctr %r15
bctr
l1: lwz %r10, 28(%r14) /* load register arguments */
lwz %r9, 24(%r14)
lwz %r8, 20(%r14)
lwz %r7, 16(%r14)
lwz %r6, 12(%r14)
lwz %r5, 8(%r14)
lwz %r4, 4(%r14)
lwz %r3, 0(%r14)
lwz %r15, 4(%r1) /* LR (needed?) */
stw %r15, -4(%r14)
lwz %r15, 0(%r1) /* Back chain (needed?) */
stw %r15, -8(%r14)
slwi %r16, %r16, 2 /* (Count * 4, but never > 8) can be shifted from params list */
add %r1, %r14, %r16 /* set frame-pointer to faked frame */
subi %r1, %r1, 8 /* Add LR and back chain save word */
mtctr %r13 /* jump to proc */
bctr
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