/*
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 | *
* ------------------------------------------------- *
* | 0x0 | 0x4 | 0x8 | 0xc | 0x10| 0x14| 0x18| 0x1c| *
* ------------------------------------------------- *
* |hiddn| v1 | v2 | v3 | v4 | v5 | v6 | v7 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | *
* ------------------------------------------------- *
* | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c| *
* ------------------------------------------------- *
* | v8 | lr | pc | FCTX| DATA| | *
* ------------------------------------------------- *
* *
*******************************************************/
.text
.globl ontop_fcontext
.align 2
.type ontop_fcontext,%function
ontop_fcontext:
@ save LR as PC
push {lr}
@ save hidden,V1-V8,LR
push {a1,v1-v8,lr}
@ store RSP (pointing to context-data) in A1
mov a1, sp
@ restore RSP (pointing to context-data) from A2
mov sp, a2
@ store parent context in A2
mov a2, a1
@ restore hidden,V1-V8,LR
pop {a1,v1-v8,lr}
@ return transfer_t from jump
str a2, [a1, #0]
str a3, [a1, #4]
@ pass transfer_t as first arg in context function
@ A1 == hidden, A2 == FCTX, A3 == DATA
@ skip PC
add sp, sp, #4
@ jump to ontop-function
bx a4
.size ontop_fcontext,.-ontop_fcontext
@ Mark that we don't need executable stack.
.section .note.GNU-stack,"",%progbits