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1 | /* |
2 | Copyright Oliver Kowalke 2009. | |
3 | Distributed under the Boost Software License, Version 1.0. | |
4 | (See accompanying file LICENSE_1_0.txt or copy at | |
5 | http://www.boost.org/LICENSE_1_0.txt) | |
6 | */ | |
7 | ||
8 | /******************************************************* | |
9 | * * | |
10 | * ------------------------------------------------- * | |
11 | * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | * | |
12 | * ------------------------------------------------- * | |
13 | * | 0x0 | 0x4 | 0x8 | 0xc | 0x10| 0x14| 0x18| 0x1c| * | |
14 | * ------------------------------------------------- * | |
15 | * |hiddn| v1 | v2 | v3 | v4 | v5 | v6 | v7 | * | |
16 | * ------------------------------------------------- * | |
17 | * ------------------------------------------------- * | |
18 | * | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | * | |
19 | * ------------------------------------------------- * | |
20 | * | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c| * | |
21 | * ------------------------------------------------- * | |
22 | * | v8 | lr | pc | FCTX| DATA| | * | |
23 | * ------------------------------------------------- * | |
24 | * * | |
25 | *******************************************************/ | |
26 | ||
27 | .text | |
28 | .globl ontop_fcontext | |
29 | .align 2 | |
30 | .type ontop_fcontext,%function | |
31 | ontop_fcontext: | |
32 | @ save LR as PC | |
33 | push {lr} | |
34 | @ save hidden,V1-V8,LR | |
35 | push {a1,v1-v8,lr} | |
36 | ||
37 | @ store RSP (pointing to context-data) in A1 | |
38 | mov a1, sp | |
39 | ||
40 | @ restore RSP (pointing to context-data) from A2 | |
41 | mov sp, a2 | |
42 | ||
43 | @ store parent context in A2 | |
44 | mov a2, a1 | |
45 | ||
46 | @ restore hidden,V1-V8,LR | |
47 | pop {a1,v1-v8,lr} | |
48 | ||
49 | @ return transfer_t from jump | |
50 | str a2, [a1, #0] | |
51 | str a3, [a1, #4] | |
52 | @ pass transfer_t as first arg in context function | |
53 | @ A1 == hidden, A2 == FCTX, A3 == DATA | |
54 | ||
55 | @ skip PC | |
56 | add sp, sp, #4 | |
57 | ||
58 | @ jump to ontop-function | |
59 | bx a4 | |
60 | .size ontop_fcontext,.-ontop_fcontext | |
61 | ||
62 | @ Mark that we don't need executable stack. | |
63 | .section .note.GNU-stack,"",%progbits |