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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 | * ------------------------------------------------- * | |
b32b8144 | 15 | * | s16 | s17 | s18 | s19 | s20 | s21 | s22 | s23 | * |
7c673cae FG |
16 | * ------------------------------------------------- * |
17 | * ------------------------------------------------- * | |
18 | * | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | * | |
19 | * ------------------------------------------------- * | |
20 | * | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c| * | |
21 | * ------------------------------------------------- * | |
b32b8144 FG |
22 | * | s24 | s25 | s26 | s27 | s28 | s29 | s30 | s31 | * |
23 | * ------------------------------------------------- * | |
24 | * ------------------------------------------------- * | |
25 | * | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | * | |
26 | * ------------------------------------------------- * | |
27 | * | 0x40| 0x44| 0x48| 0x4c| 0x50| 0x54| 0x58| 0x5c| * | |
28 | * ------------------------------------------------- * | |
29 | * |hiddn| v1 | v2 | v3 | v4 | v5 | v6 | v7 | * | |
30 | * ------------------------------------------------- * | |
31 | * ------------------------------------------------- * | |
32 | * | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | * | |
33 | * ------------------------------------------------- * | |
34 | * | 0x60| 0x64| 0x68| 0x6c| 0x70| 0x74| 0x78| 0x7c| * | |
35 | * ------------------------------------------------- * | |
7c673cae FG |
36 | * | v8 | lr | pc | FCTX| DATA| | * |
37 | * ------------------------------------------------- * | |
38 | * * | |
39 | *******************************************************/ | |
40 | ||
92f5a8d4 | 41 | .file "ontop_arm_aapcs_elf_gas.S" |
7c673cae FG |
42 | .text |
43 | .globl ontop_fcontext | |
44 | .align 2 | |
45 | .type ontop_fcontext,%function | |
92f5a8d4 | 46 | .syntax unified |
7c673cae FG |
47 | ontop_fcontext: |
48 | @ save LR as PC | |
49 | push {lr} | |
50 | @ save hidden,V1-V8,LR | |
51 | push {a1,v1-v8,lr} | |
52 | ||
b32b8144 FG |
53 | @ prepare stack for FPU |
54 | sub sp, sp, #64 | |
55 | #if (defined(__VFP_FP__) && !defined(__SOFTFP__)) | |
56 | @ save S16-S31 | |
57 | vstmia sp, {d8-d15} | |
58 | #endif | |
59 | ||
7c673cae FG |
60 | @ store RSP (pointing to context-data) in A1 |
61 | mov a1, sp | |
62 | ||
63 | @ restore RSP (pointing to context-data) from A2 | |
64 | mov sp, a2 | |
65 | ||
66 | @ store parent context in A2 | |
67 | mov a2, a1 | |
68 | ||
b32b8144 FG |
69 | #if (defined(__VFP_FP__) && !defined(__SOFTFP__)) |
70 | @ restore S16-S31 | |
71 | vldmia sp, {d8-d15} | |
72 | #endif | |
73 | @ prepare stack for FPU | |
74 | add sp, sp, #64 | |
75 | ||
7c673cae FG |
76 | @ restore hidden,V1-V8,LR |
77 | pop {a1,v1-v8,lr} | |
78 | ||
79 | @ return transfer_t from jump | |
80 | str a2, [a1, #0] | |
81 | str a3, [a1, #4] | |
82 | @ pass transfer_t as first arg in context function | |
83 | @ A1 == hidden, A2 == FCTX, A3 == DATA | |
84 | ||
85 | @ skip PC | |
86 | add sp, sp, #4 | |
87 | ||
88 | @ jump to ontop-function | |
89 | bx a4 | |
90 | .size ontop_fcontext,.-ontop_fcontext | |
91 | ||
92 | @ Mark that we don't need executable stack. | |
93 | .section .note.GNU-stack,"",%progbits |