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apply-hack.ppc.darwin.S
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apply-hack.ppc.darwin.S
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/* apply-hack.ppc.s
;
; Copyright (c) 2008-2014, The CHICKEN Team
; Copyright (c) 2007, Felix L. Winkelmann
; 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 */
cmpwi r15, 8
bge l1
li r3, 8 /* offset is (8 - count) * 4 */
sub r15, r3, r15
slwi r15, r15, 2
bl l2 /* compute branch address */
l2: mflr r4
add r15, r4, r15
addi r15, r15, lo16(l1 - l2)
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, 20(r1) /* save link area above faked argument area */
stw r15, -4(r14) /* (start from end if destination overlaps) */
lwz r15, 16(r1) /* is this needed at all? at least for proper gdb backtraces? */
stw r15, -8(r14)
lwz r15, 12(r1)
stw r15, -12(r14)
lwz r15, 8(r1)
stw r15, -16(r14)
lwz r15, 4(r1)
stw r15, -20(r14)
lwz r15, 0(r1)
stw r15, -24(r14)
addi r1, r14, -24 /* set frame-pointer to faked frame */
mtctr r13 /* jump to proc, lr is invalid, but we won't return anyway */
bctr