/*
Copyright Oliver Kowalke 2009.
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt)
*/
/*******************************************************
* *
* ------------------------------------------------- *
* | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | *
* ------------------------------------------------- *
* | 0 | 4 | 8 | 12 | 16 | 20 | 24 | 28 | *
* ------------------------------------------------- *
* | R13 | R14 | R15 | R16 | R17 | R18 | R19 | R20 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | *
* ------------------------------------------------- *
* | 32 | 36 | 40 | 44 | 48 | 52 | 56 | 60 | *
* ------------------------------------------------- *
* | R21 | R22 | R23 | R24 | R25 | R26 | R27 | R28 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | *
* ------------------------------------------------- *
* | 64 | 68 | 72 | 76 | 80 | 84 | 88 | 92 | *
* ------------------------------------------------- *
* | R29 | R30 | R31 |hiddn| CR | LR | PC | FCTX| *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | *
* ------------------------------------------------- *
* | 96 | 100 | 104 | 108 | 112 | 116 | 120 | 124 | *
* ------------------------------------------------- *
* | DATA| | | | | *
* ------------------------------------------------- *
* *
*******************************************************/
.text
.globl ontop_fcontext
.align 2
.type ontop_fcontext,@function
ontop_fcontext:
# reserve space on stack
subi %r1, %r1, 92
stw %r13, 0(%r1) # save R13
stw %r14, 4(%r1) # save R14
stw %r15, 8(%r1) # save R15
stw %r16, 12(%r1) # save R16
stw %r17, 16(%r1) # save R17
stw %r18, 20(%r1) # save R18
stw %r19, 24(%r1) # save R19
stw %r20, 28(%r1) # save R20
stw %r21, 32(%r1) # save R21
stw %r22, 36(%r1) # save R22
stw %r23, 40(%r1) # save R23
stw %r24, 44(%r1) # save R24
stw %r25, 48(%r1) # save R25
stw %r26, 52(%r1) # save R26
stw %r27, 56(%r1) # save R27
stw %r28, 60(%r1) # save R28
stw %r29, 64(%r1) # save R29
stw %r30, 68(%r1) # save R30
stw %r31, 72(%r1) # save R31
stw %r3, 76(%r1) # save hidden
# save CR
mfcr %r0
stw %r0, 80(%r1)
# save LR
mflr %r0
stw %r0, 84(%r1)
# save LR as PC
stw %r0, 88(%r1)
# store RSP (pointing to context-data) in R7
mr %r7, %r1
# restore RSP (pointing to context-data) from R4
mr %r1, %r4
lwz %r13, 0(%r1) # restore R13
lwz %r14, 4(%r1) # restore R14
lwz %r15, 8(%r1) # restore R15
lwz %r16, 12(%r1) # restore R16
lwz %r17, 16(%r1) # restore R17
lwz %r18, 20(%r1) # restore R18
lwz %r19, 24(%r1) # restore R19
lwz %r20, 28(%r1) # restore R20
lwz %r21, 32(%r1) # restore R21
lwz %r22, 36(%r1) # restore R22
lwz %r23, 40(%r1) # restore R23
lwz %r24, 44(%r1) # restore R24
lwz %r25, 48(%r1) # restore R25
lwz %r26, 52(%r1) # restore R26
lwz %r27, 56(%r1) # restore R27
lwz %r28, 60(%r1) # restore R28
lwz %r29, 64(%r1) # restore R29
lwz %r30, 68(%r1) # restore R30
lwz %r31, 72(%r1) # restore R31
lwz %r4, 76(%r1) # restore hidden
# restore CR
lwz %r0, 80(%r1)
mtcr %r0
# restore LR
lwz %r0, 84(%r1)
mtlr %r0
# ignore PC
# adjust stack
addi %r1, %r1, 92
# return transfer_t
stw %r7, 0(%r4)
stw %r5, 4(%r4)
# restore CTR
mtctr %r6
# jump to ontop-function
bctr
.size ontop_fcontext, .-ontop_fcontext
/* Mark that we don't need executable stack. */
.section .note.GNU-stack,"",%progbits