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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 | * | s16 | s17 | s18 | s19 | s20 | s21 | s22 | s23 | * | |
16 | * ------------------------------------------------- * | |
17 | * ------------------------------------------------- * | |
18 | * | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | * | |
19 | * ------------------------------------------------- * | |
20 | * | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c| * | |
21 | * ------------------------------------------------- * | |
22 | * | s24 | s25 | s26 | s27 | s28 | s29 | s30 | s31 | * | |
23 | * ------------------------------------------------- * | |
24 | * ------------------------------------------------- * | |
25 | * | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | * | |
26 | * ------------------------------------------------- * | |
27 | * | 0x0 | 0x4 | 0x8 | 0xc | 0x10| 0x14| 0x18| 0x1c| * | |
28 | * ------------------------------------------------- * | |
29 | * | sjlj|hiddn| v1 | v2 | v3 | v4 | v5 | v6 | * | |
30 | * ------------------------------------------------- * | |
31 | * ------------------------------------------------- * | |
32 | * | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | * | |
33 | * ------------------------------------------------- * | |
34 | * | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c| * | |
35 | * ------------------------------------------------- * | |
36 | * | v7 | v8 | lr | pc | FCTX| DATA| | * | |
37 | * ------------------------------------------------- * | |
38 | * * | |
39 | *******************************************************/ | |
40 | ||
41 | .text | |
42 | .globl _jump_fcontext | |
43 | .align 2 | |
44 | _jump_fcontext: | |
45 | @ save LR as PC | |
46 | push {lr} | |
47 | @ save hidden,V1-V8,LR | |
48 | push {a1,v1-v8,lr} | |
49 | ||
50 | @ locate TLS to save/restore SjLj handler | |
51 | mrc p15, 0, v2, c13, c0, #3 | |
52 | bic v2, v2, #3 | |
53 | ||
54 | @ load TLS[__PTK_LIBC_DYLD_Unwind_SjLj_Key] | |
55 | ldr v1, [v2, #72] | |
56 | @ save SjLj handler | |
57 | push {v1} | |
58 | ||
59 | @ prepare stack for FPU | |
60 | sub sp, sp, #64 | |
61 | #if (defined(__VFP_FP__) && !defined(__SOFTFP__)) | |
62 | @ save S16-S31 | |
63 | vstmia sp, {d8-d15} | |
64 | #endif | |
65 | ||
66 | @ store RSP (pointing to context-data) in A1 | |
67 | mov a1, sp | |
68 | ||
69 | @ restore RSP (pointing to context-data) from A2 | |
70 | mov sp, a2 | |
71 | ||
72 | #if (defined(__VFP_FP__) && !defined(__SOFTFP__)) | |
73 | @ restore S16-S31 | |
74 | vldmia sp, {d8-d15} | |
75 | #endif | |
76 | @ prepare stack for FPU | |
77 | add sp, sp, #64 | |
78 | ||
79 | @ r#estore SjLj handler | |
80 | pop {v1} | |
81 | @ store SjLj handler in TLS | |
82 | str v1, [v2, #72] | |
83 | ||
84 | @ restore hidden,V1-V8,LR | |
85 | pop {a4,v1-v8,lr} | |
86 | ||
87 | @ return transfer_t from jump | |
88 | str a1, [a4, #0] | |
89 | str a3, [a4, #4] | |
90 | @ pass transfer_t as first arg in context function | |
91 | @ A1 == FCTX, A2 == DATA | |
92 | mov a2, a3 | |
93 | ||
94 | @ restore PC | |
95 | pop {pc} |